|Publication number||USRE40268 E1|
|Application number||US 11/019,148|
|Publication date||Apr 29, 2008|
|Filing date||Dec 21, 2004|
|Priority date||Sep 25, 2000|
|Also published as||DE10146724A1, DE10146724B4, US6356188, US6593849, US20020056582|
|Publication number||019148, 11019148, US RE40268 E1, US RE40268E1, US-E1-RE40268, USRE40268 E1, USRE40268E1|
|Inventors||Joseph Carr Meyers, Todd Allen Brown|
|Original Assignee||Ford Global Technologies, Llc|
|Export Citation||BiBTeX, EndNote, RefMan|
|Patent Citations (99), Non-Patent Citations (8), Classifications (25), Legal Events (1) |
|External Links: USPTO, USPTO Assignment, Espacenet|
Wheel lift identification for an automotive vehicle
US RE40268 E1
A system for detecting wheel lift of an automotive vehicle has a speed sensor (22) coupled to a wheel (12) of automotive vehicle (10). A torque control system (20) is coupled to wheel (12) to change the torque at the wheel. A controller (18) is coupled to the torque control system and a speed sensor. The controller (18) determines lift by changing the torque of the wheel, measuring the change in torque and indicating lift in response to change in torque which may be indicated by wheel speed.
1. A method for determining wheel lift of a wheel of an automotive vehicle comprising the steps of:
applying a change of torque to the wheel;
measuring a change in a wheel condition since initiating the step of applying a change of torque;
indicating wheel lift if the change in the wheel condition is greater than a predetermined value.
2. A method as recited in claim 1 wherein the condition is one selected from the group of acceleration and speed.
3. A method as recited in claim 1
further comprising the step of removing the change of torque;
measuring a wheel condition after the step of removing the change of torque.
4. A method as recited in claim 3 further comprising the step of determining whether the second wheel condition is above a threshold.
5. A method as recited in claim 1 wherein the step of applying a change of torque comprises applying a brake to the wheel.
6. A method as recited in claim 5
further comprising the step of releasing the brake;
determining a wheel condition after the step of releasing the brake;
when the wheel condition does not increase over a reacceleration threshold, confirming wheel lift;
when wheel speed condition increases over a reacceleration threshold, indicating wheel contact.
7. A method as recited in claim 1 wherein the step of applying a change of torque comprises applying engine torque.
8. A method for monitoring a predetermined condition of an automotive vehicle having a plurality of wheels comprising the steps of:
determining a potential for the predetermined condition of the wheel;
measuring a first wheel speed of a suspected lifting wheel;
thereafter, changing the torque of aapplied to the suspected lifting wheel from a first torque to a second torque;
changing the torque from the vehicleapplied to the suspected lifting wheel from the second torque to the first torque;
measuring a second wheel speed of the suspected lifting wheel;
determining a wheel speed change as a function of the first wheel speed and the second wheel speed;
when the change in wheel speed is greater than a reacceleration threshold, confirming the wheel lift.
9. A method as recited in claim 8 wherein the predetermined condition isdetermining a potential for wheel lift comprises determining the potential for wheel lift as a function of roll angle, steering wheel angle, and road bank angle.
10. A method as recited in claim 8 wherein the step of changing the torque comprises the step of applying the brake.
11. A method as recited in claim 8 wherein the step of changing the torque comprises the step of applying engine torque.
12. A method as recited in claim 8 wherein a predetermined condition comprises a sensor failure.
13. A method as recited in claim 8 wherein the predetermined condition comprises wheel lift.
14. A method as recited in claim 8 further comprising the step of correcting lift by applying the brakes.
15. A method as recited in claim 8 further comprising the step of correcting lift by applying a steering correction.
16. A method as recited in claim 8 further comprising the step of calculating a traction level after the step of confirming wheel lift.
17. A system for detecting lift of a wheel of an automotive vehicle comprising:
a speed sensor coupled to the wheel producing a wheel speed signal;
a torque control system coupled to the wheel for changing the torque atapplied to the wheel;
a controller coupled to the said torque control system and the wheel speed sensor, said controller determining lift by changing the torque ofapplied to the wheel, increasing thea brake torque until a maximum brake torque threshold is achieved, detecting a change in wheel speed since the application of the brake torque, comparing the change in wheel speed to a threshold, when the change in wheel speed is above the wheel speed change threshold value, indicating wheel lift, when the brake torque reaches a maximum value before the change in wheel speed reaches the threshold, holding the brake torque for a predetermined amount of time, continuing to monitor the change in wheel speed during a hold duration, determining a second change in wheel speed, comparing the second change in wheel speed to the threshold value, when the second chnage in wheel speed exceeds the threshold value during the hold duration, indicating lift.
18. A method for determining wheel lift of a vehicle comprising the steps of:
applying a torque to thea wheel by applying a brake torque;
increasing the brake torque to build until a maximum brake torque threshold is achieved;
detecting thea change in wheel speed since the application of brake torque;
comparing the change in wheel speed to a wheel speed change threshold;
when the change in speed is above the wheel speed change threshold value, indicating wheel lift;
when the brake torque reaches a maximum value before the change in wheel speed reaches the wheel speed change threshold, holding the torque for a predetermined amount of time;
continuing to monitor the change in wheel speed during a hold duration;
determining a second change in wheel speed;
comparing the second wheel speed to the threshold value;
when the second wheel speed exceeds the threshold value during the hold duration, indicating a wheel lift.
19. A method as recited in claim 18
further comprising the steps of:
releasing the torque;
determining a wheel speed change;
when the wheel speed change is greater than a reacceleration threshold, indicating wheel contact;
when the wheel speed change is less than the reacceleration threshold, confirming an indication of wheel lift.
20. A method as recited in claim 18 further comprising the step of calculating a traction level.
21. A method as recited in claim 18 further comprising the step of when wheel lift is detected, continually monitoring the wheel speed change for a sudden increase to acknowledge wheel contact.
22. A method for monitoring wheel lift of an automotive vehicle having a plurality of wheels comprising the steps of:
determining a potential for wheel lift of the wheel as a function of road bank angle;
measuring a first wheel speed of a suspected lifting wheel;
thereafter, changing a torque of the suspected lifting wheel from a first torque to a second torque;
changing the torque of the suspected lifting wheel from the second torque to the first torque;
measuring a second wheel speed of the suspected lifting wheel;
determining a wheel speed change as a function of the first wheel speed and the second wheel speed;
when the change in wheel speed is greater than a reacceleration threshold, confirming wheel lift.
23. A method for monitoring a sensor failure condition of an automotive vehicle having a plurality of wheels comprising the steps of:
determining a potential for sensor failure;
measuring a first wheel speed;
thereafter, changing a torque of a suspected lifting wheel from a first torque to a second torque;
changing the torque from the second torque to the first torque;
measuring a second wheel speed;
determining a wheel speed change as a function of the first wheel speed and the second wheel speed;
when the change in wheel speed is greater than a reacceleration threshold, confirming the sensor failure.
The present invention relates generally to a dynamic behavior control apparatus for an automotive vehicle, and more specifically, to a method and apparatus for determining whether a wheel of an automotive vehicle has lifted from the pavement.
Dynamic control systems for automotive vehicles have recently begun to be offered on various products. Dynamic control systems typically control the yaw of the vehicle by controlling the braking effort at various wheels of the vehicle. By regulating the amount of braking at each corner of the vehicle, the desired direction of the vehicle may be maintained.
Typically, the dynamic control systems do not address roll of the vehicle. For high profile vehicles in particular, it would be desirable to control the rollover characteristics of the vehicle to maintain the vehicle position with respect to the road. That is, it is desirable to maintain contact of each of the four tires of the vehicle on the road.
Vehicle rollover and tilt control (or body roll) are distinguishable dynamic characteristics. Tilt control maintains the body on a plane or nearly on a plane parallel to the road surface. Rollover control is used to maintain the vehicle wheels on the road surface.
Such systems typically use position sensors to measure the relative distance between the vehicle body and the vehicle suspension. One drawback to such systems is that the distance from the body to the road must be inferred.
It would therefore be desirable to provide a rollover detection system having reduced costs and increased reliability in predicting the occurrence of a rollover.
SUMMARY OF THE INVENTION
It is therefore one object of the invention to provide a rollover detection system that may be used in conjunction with the dynamic stability control system of the vehicle to determine rollover.
In one aspect of the invention, a wheel lift identification system for an automotive vehicle includes a speed sensor coupled to the vehicle producing a wheel speed signal. A torque control system is coupled to the wheel for charging the torque at the wheel. A controller is coupled to the torque control system and the speed sensor. The controller determines lift by changing the torque of the wheel, measuring the change in wheel speed since the torque was changed, and indicating a wheel lift if the change in the wheel speed is greater than a predetermined value.
In a further aspect of the invention, a method for determining wheel lift of a vehicle comprises the steps of:
- changing the torque of a wheel;
- measuring the change in wheel speed since the step of changing torque; and,
- indicating wheel lift if the change in wheel speed is greater than a predetermined value.
In a further aspect of the invention, the changing of the torque of the wheel may be performed by increasing the brake pressure for that wheel. When the wheel speed has significant deceleration, a wheel flag is set. When the brake pressure is released and the wheel speed changes greater than a reacceleration threshold, then wheel contact is assumed. If the wheel speed does not increase over the reacceleration threshold within a predetermined time, then wheel lift status is confirmed. As an alternative, driveline torque may be used.
One advantage of the invention is that in vehicles employing a dynamic stability control system, additional sensors may not be required.
Other objects and features of the present invention will become apparent when viewed in light of the detailed description of the preferred embodiment when taken in conjunction with the attached drawings and appended claims.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a partial cutaway view of an automotive vehicle having a wheel lift identification system according to the present invention.
FIG. 2 is a flow chart of a wheel lift identification system according to the present invention.
FIG. 3A is a plot of pressure versus time for a wheel lift identification system according to one embodiment of the present invention.
FIG. 3B is a plot of wheel speed versus time for a wheel lift identification system according to one embodiment of the present invention.
DESCRIPTION OF THE PREFERRED EMBODIMENT
The present invention is described with respect to a wheel lift identification system for an automotive vehicle. Those skilled in the art will recognize that the present invention may be incorporated into a rollover prevention system for an automotive vehicle.
Referring now to FIG. 1, an automotive vehicle 10 has a plurality of wheels 12, two of which are shown as elevated above a road plane 14. A roll control system 16 is included within vehicle 10. The roll control system 16 is used to counteract the lifting of wheels 12 from road plane 14 as will be further described below. Roll control system 16 includes a roll controller 18 that is preferably microprocessor based. Roll controller 18 may be part of a dynamic stability control system of the automotive vehicle 10. Roll controller 18 is coupled to a torque control system 20 that is used to control the torque of the wheels 12. Although torque control system 20 is illustrated as a separate item, torque control system 20 may be included in roll controller 18 which may in turn be included within a dynamic stability control system. Torque control system 20 may act in conjunction with the electronic engine controller, a driveline engagement mechanism or braking system, or a combination of these to control the torque at one or all of the wheels 12. Torque controller 20 and roll controller 18 may be coupled to wheel speed sensors 22 located at each of the wheels 12. Wheel speed sensors 22 provide roll controller 18 with a signal indicative of the speed of the individual wheel to which it is attached. Various types of wheel speed sensors including toothed-wheel type systems would be evident to those skilled in the art.
Other sensors 24 may be coupled to roll control system 16. For example, roll angle sensors, steering wheel angle sensors, yaw rate sensors, and other sensors may be incorporated therein. Other sensors 24, as will be further described below, may be used to identify a condition suitable for the potential of wheel lift. Such a condition may initiate further action by roll control system 16 to verify wheel lift.
In the following example, the application of brake pressure is used to provide the change in torque. However, other methods such as applying engine torque may also be used to change the amount of torque at a wheel. Further references to the application of torque to a wheel may include hydraulic or electric brake torque, changes in engine torque or engagement of driveline torque through the use of an electronically controlled transfer case, differential, transmission or clutch. The present invention may also be used to determine if a sensor has failed in the roll control system 16. That is, if roll is suspected by a particular sensor but all other conditions or sensors indicate otherwise, the sensor may be operating improperly. Also, although speed is used, wheel acceleration may also be used in place of speed as would be evident to those skilled in the art.
Referring now to FIG. 2, in step 30, if a roll sensor failure is suspected or in step 32 if wheel lift is suspected by the roll control system 16, block 34 initiates the wheel lift determination process. In step 36, torque is applied to the wheel suspected of lifting and the wheel speed at the suspected wheel is stored. In step 38, the torque is increased by applying a test pulse of torque to the suspected wheel. Torque is applied until a torque threshold (Torque_Max) is achieved. In step 40, if the torque is greater than the Torque_Max, the torque is held constant in step 42. In step 44, if the time as counted by the Build_Counter is greater than a predetermined time, step 46 is executed in which the torque is released and the wheel speed at the initiation of the release of torque is stored. In step 44, if the counter is not greater than the predetermined hold time, the counter is incremented in step 48. After step 48 the change in wheel speed is compared to a predetermined change in wheel speed. If the wheel speed change is not greater than a predetermined speed in step 50, steps 38-44 are again executed. If the wheel speed change is greater than a predetermined speed, this indicates a lifted wheel. In this case, step 52 is executed in which a wheel lift status flag is set. After step 52, step 54 is executed in which the build counter is reset.
Referring back to step 40, if the torque is not greater than the torque threshold then step 50 is executed.
Referring back to step 46, after the wheel speed is recorded after the torque release, step 56 is executed. In step 56 torque is released. After step 56, step 58 is implemented in which the wheel speed change is compared to a reacceleration threshold. The reacceleration threshold is a predetermined value that corresponds to a wheel speed change that should be achieved should wheel contact be reestablished. The wheel speed change is determined from the time that the torque was released. If the wheel speed change is greater than a reacceleration threshold or if the wheel lift status from steo 52 is zero, wheel contact is assumed. In such a case the traction level may be calculated in step 60. If the wheel speed does not increase over the reacceleration threshold, then the wheel lift status is confirmed beginning with step 70.
Referring back to step 58, if the wheel speed is less than the reacceleration threshold, step 62 compares the Dump_Counter to a predetermined dump time. If the predetermined dump time is greater than the Dump_Counter, then the Dump_Counter is incremented in step 64 and steps 56 and 58 are again executed. If the Dump_Counter is greater than the predetermined dump time, then the wheel lift status flag is set in step 66 and the Dump_Counter is reset in step 68. After step 68, the process is reinitiated and returns to step 36.
Returning back to step 60, the traction level is calculated in step 60. After step 60, the plausibility of a sensor failure is determined. If, for example, the process was initiated based on the suspicion of a sensor failure from block 30 above and no wheel lift was detected, a sensor failure is indicated in step 72. For either result, if a sensor failure is indicated by block 70 or not, the build counter and Dump_Counter are cleared in block 74 and the wheel lift status is cleared in block 76. The end of the routine occurs in block 78.
Thus, as can be seen, the application of torque can be used to first determine whether a suspected wheel has lifted from the pavement. For confirmation, the removal of the torque and the resulting wheel speed change may be used to confirm the initial finding. Advantageously, the system may be implemented in a dynamic stability system of an automotive vehicle without adding further sensors. If rollover is detected, then the rollover can be corrected by applying the brakes or generating a steering correction.
Referring now to FIG. 3A, various lines 90, 92, 94 are illustrated during the build time to illustrate the variation in pressure of the braking system due to wear and other effects of the brakes. Lines 90, 92 94 have little effect on the overall operation of the system. Thus, the thresholds and parameters are selected so that the system is robust to wear and system variation. The maximum pressure Pmax is reached and maintained for a hold time (such as set forth in step 42 above) until it is released.
Referring now to FIG. 3B, a plot of wheel speed corresponding to the various times is illustrated. As shown, the wheel speed of a loaded wheel is illustrated by line 96 which is higher than the wheel speed of a lifted wheel illustrated by line 98.
While particular embodiments of the invention have been shown and described, numerous variations alternate embodiments will occur to those skilled in the art. Accordingly, it is intended that the invention be limited only in terms of the appended claims.
|Cited Patent||Filing date||Publication date||Applicant||Title|
|US2917126||Apr 4, 1957||Dec 15, 1959||Nolan Phillips||Driving control safety mechanism for tractors|
|US3604273||Nov 25, 1968||Sep 14, 1971||Aviat Electric Ltd||Angular rate sensor|
|US3608925||May 7, 1969||Sep 28, 1971||Murphy Peter H||Apparatus for offsetting centrifugal force affecting motor vehicles|
|US3797893||Jul 6, 1972||Mar 19, 1974||Daimler Benz Ag||Brake force control system for vehicles|
|US3899028||Aug 28, 1973||Aug 12, 1975||Systron Donner Corp||Angular position sensing and control system, apparatus and method|
|US3948567||Feb 12, 1975||Apr 6, 1976||The Bendix Corporation||Sway control means for a trailer|
|US3972543||Dec 6, 1974||Aug 3, 1976||The Bendix Corporation||Combination vehicle yaw stabilizer|
|US4023864||Sep 29, 1975||May 17, 1977||Lang Davis Industries, Inc.||Automatic stability control system with strain gauge sensors|
|US4480714||Jun 8, 1982||Nov 6, 1984||Toyo Umpanki Co., Ltd.||System for preventing carrier from turning sideways|
|US4592565||Oct 17, 1984||Jun 3, 1986||Leo Eagle||Apparatus for detecting an overturning moment in a moving vehicle, and jackknifing in a trailer-truck combination|
|US4597462||Jan 29, 1985||Jul 1, 1986||Honda Giken Kogyo Kabushiki Kaisha||Steering system for vehicles|
|US4624476||Jan 24, 1985||Nov 25, 1986||Mitsubishi Jidosha Kogyo Kabushiki Kaisha||Vehicle suspension apparatus|
|US4650212||Mar 13, 1986||Mar 17, 1987||Mazda Motor Corporation||Vehicle suspension system|
|US4679808||Mar 7, 1986||Jul 14, 1987||Nissan Motor Co., Ltd.||Vehicle motion estimating system|
|US4690553||Jun 12, 1980||Sep 1, 1987||Omron Tateisi Electronics Co.||Road surface condition detection system|
|US4705130||Jan 28, 1985||Nov 10, 1987||Nissan Motor Co., Ltd.||Method of controlling vehicle|
|US4761022||Feb 24, 1987||Aug 2, 1988||Toyota Jidosha Kabushiki Kaisha||Suspension controller for improved turning|
|US4765649||Mar 16, 1987||Aug 23, 1988||Toyota Jidosha Kabushiki Kaisha||System for vehicle body roll control detecting and compensating for changes of loaded vehicle weight|
|US4767588||Apr 11, 1986||Aug 30, 1988||Nissan Motor Co., Ltd.||Vehicle control system for controlling side slip angle and yaw rate gain|
|US4778773||Jun 10, 1987||Oct 18, 1988||Nec Corporation||Semiconductors; gate electrode as mask for photoresist layer being exposed through transparent substrate|
|US4809183||Feb 25, 1987||Feb 28, 1989||Robert Bosch Gmbh||Speed control system for motor vehicles operating in a curved path|
|US4827416||Sep 12, 1986||May 2, 1989||Nissan Motor Company, Limited||Method and system for controlling automotive suspension system, particularly for controlling suspension characteristics in accordance with road surface conditions|
|US4846496||Jan 7, 1988||Jul 11, 1989||Mitsubishi Jidosha Kogyo Kabushiki Kaisha||Vehicle suspension apparatus|
|US4872116||Mar 20, 1989||Oct 3, 1989||Nissan Motor Company, Limited||Vehicle motion estimating system of hybrid type|
|US4888696||Mar 31, 1988||Dec 19, 1989||Nissan Motor Company, Limited||Actively controlled automotive suspension system with acceleration and angular velocity dependent anti-pitching and/or anti-rolling feature|
|US4898431||Jun 15, 1988||Feb 6, 1990||Aisin Seiki Kabushiki Kaisha||Brake controlling system|
|US4930082||Jul 27, 1988||May 29, 1990||Mitsubishi Jidosha Kogyo Kabushiki Kaisha||Control apparatus for a vehicular suspension system|
|US4951198||Oct 14, 1988||Aug 21, 1990||Mazda Motor Corporation||Friction detecting device for vehicles|
|US4960292||Oct 11, 1989||Oct 2, 1990||Jaguar Cars Limited||Air bag restraint systems|
|US4964679||Feb 23, 1989||Oct 23, 1990||Lucas Industries Public Limited Co.||Monitoring method and apparatus for a brake system of heavy-duty vehicles|
|US4967865||Feb 13, 1989||Nov 6, 1990||Daimler-Benz Ag||Supplementary steering system|
|US4976330||Dec 6, 1988||Dec 11, 1990||Fuji Jukogyo Kabushiki Kaisha||Vehicle traction control system for preventing vehicle turnover on curves and turns|
|US4998593||Mar 31, 1989||Mar 12, 1991||Aisin Seiki Kabushiki Kaisha||Steering and brake controlling system|
|US5033770||Sep 22, 1989||Jul 23, 1991||Fuji Jukogyo Kabushiki Kaisha||Controlling apparatus for active suspension system for automotive vehicle|
|US5058017||Nov 2, 1988||Oct 15, 1991||Hitachi, Ltd.||System for control of vehicle suspension|
|US5066041||Jan 18, 1991||Nov 19, 1991||Baverische Motoren Werke Ag||Control system for stabilizing the rolling of a vehicle|
|US5088040||Jan 17, 1990||Feb 11, 1992||Nissan Motor Company, Limited||Automotive control system providing anti-skid steering|
|US5089967||Aug 20, 1990||Feb 18, 1992||Nippondenso Co., Ltd.||Auxiliary steering system associated with anti-skid control system for use in motor vehicle|
|US5163319||Oct 12, 1988||Nov 17, 1992||Messerschmitt-Bolkow-Blohm Gmbh||Method and a device for recognizing the condition of a road|
|US5200896||Sep 6, 1990||Apr 6, 1993||Honda Giken Kogyo Kabushiki Kaisha||Method for estimating longitudinal acceleration or deceleration of a vehicle body|
|US5208749||Aug 7, 1990||May 4, 1993||Hitachi, Ltd.||Method for controlling active suspension system on the basis of rotational motion model|
|US5224765||Dec 4, 1991||Jul 6, 1993||Nissan Motor Co., Ltd.||Control system for distributing braking forces applied to left and right wheels in automotive vehicles|
|US5228757||Jun 28, 1991||Jul 20, 1993||Nissan Motor Co., Ltd.||System for controlling behavior of vehicle during braking and during a steering maneuver|
|US5239868||Aug 24, 1992||Aug 31, 1993||Matsushita Electric Industrial Co., Ltd.||Angular rate detecting device|
|US5247466||Mar 25, 1991||Sep 21, 1993||Hitachi, Ltd.||Angular rate detection apparatus, acceleration detection apparatus and movement control apparatus, of moving body|
|US5261503||Dec 18, 1991||Nov 16, 1993||Aisin Seiki Kabushiki Kaisha||Adaptive steering control system|
|US5265020||Apr 18, 1991||Nov 23, 1993||Mazda Motor Corporation||Torque distribution control apparatus for four wheel drive|
|US5274576||Apr 20, 1990||Dec 28, 1993||Group Lotus Plc||Apparatus for measuring the yaw rate of a vehicle|
|US5278761||Nov 12, 1992||Jan 11, 1994||Ford Motor Company||Method for vehicular wheel spin control that adapts to different road traction characteristics|
|US5282134||Aug 19, 1991||Jan 25, 1994||Automotive Systems Laboratory, Inc.||Slant transform/signal space crash discriminator|
|US5297646||Apr 17, 1991||Mar 29, 1994||Nissan Motor Co., Ltd.||Control system for optimizing operation of vehicle performance/safety enhancing systems such as 4WS, 4WD active suspensions, and the like|
|US5307274||Dec 23, 1991||Apr 26, 1994||Sumitomo Electric Industries, Ltd.||Zero-point correction device for a gravity-type accelerometer|
|US5311431||Jul 1, 1992||May 10, 1994||Robert Bosch Gmbh||Method of obtaining the yawing velocity and/or transverse velocity of a vehicle|
|US5311956||Nov 12, 1992||May 17, 1994||Toyota Jidosha Kabushiki Kaisha||Electric control apparatus for rear wheel steering mechanism of wheeled vehicle|
|US5324102||Oct 19, 1992||Jun 28, 1994||Fag Kugelfischer Georg Schafer Kgaa||Method and apparatus for regulating the braking force of motorcycles|
|US5335176||Nov 30, 1992||Aug 2, 1994||Koyo Seiko Co., Ltd.||Safety system for vehicles|
|US5365439||Jul 5, 1991||Nov 15, 1994||Mitsubishi Jidosha Kogyo Kabushiki Kaisha||Method and apparatus for detecting friction coefficient of road surface, and method and system for four-wheel steering of vehicles using the detected friction coefficient of road surface|
|US5370199||Apr 6, 1993||Dec 6, 1994||Honda Giken Kogyo Kabushiki Kaisha||Vehicle traction control system|
|US5408411||Jan 17, 1992||Apr 18, 1995||Hitachi, Ltd.||System for predicting behavior of automotive vehicle and for controlling vehicular behavior based thereon|
|US5446658||Jun 22, 1994||Aug 29, 1995||General Motors Corporation||Method and apparatus for estimating incline and bank angles of a road surface|
|US5455770||Feb 18, 1994||Oct 3, 1995||Robert Bosch Gmbh||Vehicle movement dynamics control system|
|US5510989||May 23, 1995||Apr 23, 1996||Robert Bosch Gmbh||System for influencing the travel dynamics of an automobile|
|US5515277||Dec 14, 1994||May 7, 1996||Fuji Jukogyo Kabushiki Kaisha||Method and system for controlling active suspensions of a vehicle during acceleration and deceleration|
|US5548536||Oct 17, 1994||Aug 20, 1996||Daimler-Benz Ag||Method for determining quantities which characterize the driving behavior|
|US5549328||Jan 17, 1995||Aug 27, 1996||Gabriel Ride Control Products, Inc.||Roll control system|
|US5560688||Feb 22, 1995||Oct 1, 1996||Wabco Vermogensverwaltungs-Gmbh||Pressure control apparatus for adjusting brake pressure in a vehicle|
|US5579245||Feb 4, 1994||Nov 26, 1996||Mitsubishi Jidosha Kogyo Kabushiki Kaisha||Vehicle slip angle measuring method and a device therefor|
|US5598335||Apr 6, 1995||Jan 28, 1997||Hyundai Motor Company||System and method for controlling a shift position when a vehicle travels along a steeply sloped road or a sharply curved road|
|US5602734||Sep 23, 1994||Feb 11, 1997||Advanced Safety Concepts, Inc.||Automobile air bag systems|
|US5610575||Aug 25, 1994||Mar 11, 1997||Automotive Systems Laboratory, Inc.||Method and system for detecting vehicle roll-over|
|US5627756||Jun 2, 1995||May 6, 1997||Toyota Jidosha Kabushiki Kaisha||Device for controlling turn behavior of vehicle|
|US5634698||Feb 21, 1995||Jun 3, 1997||Robert Bosch Gmbh||System for controlling brake pressure based on fuzzy logic using steering angle and yaw speed|
|US5640324||Jan 27, 1995||Jun 17, 1997||Toyota Jidosha Kabushiki Kaisha||Dynamic behavior control apparatus of automotive vehicle|
|US5648903||Jul 10, 1995||Jul 15, 1997||Ford Global Technologies, Inc.||Four wheel steering control utilizing front/rear tire longitudinal slip difference|
|US5671982||Jun 7, 1995||Sep 30, 1997||Itt Automotive Europe Gmbh||System for applying a yawing control moment by setting brake valve opening and closing times|
|US5676433||Oct 22, 1996||Oct 14, 1997||Toyota Jidosha Kabushiki Kaisha||Device for estimating side slide velocity of vehicle compatible with rolling and cant|
|US5694319||Nov 8, 1996||Dec 2, 1997||Daimler-Benz Ag||Process for the determining travel-situation-dependent steering angle|
|US5703776||Apr 5, 1995||Dec 30, 1997||Hyundai Motor Company, Ltd.||Method and device for measuring slope of driving road|
|US5707117||Jul 19, 1996||Jan 13, 1998||General Motors Corporation||Active brake control diagnostic|
|US5707120||Oct 16, 1996||Jan 13, 1998||Toyota Jidosha Kabushiki Kaisha||Stability control device of vehicle improved against hunting|
|US5720533||Oct 15, 1996||Feb 24, 1998||General Motors Corporation||In a vehicle|
|US5723782||Nov 29, 1996||Mar 3, 1998||Bolles, Jr.; Robert C.||Method of land vehicle suspension evaluation and design through roll angle analysis|
|US5732377||Jun 7, 1995||Mar 24, 1998||Itt Automotive Europe Gmbh||Process for controlling driving stability with a yaw rate sensor equipped with two lateral acceleration meters|
|US5732378||Jun 7, 1995||Mar 24, 1998||Itt Automotive Europe Gmbh||Method for determining a wheel brake pressure|
|US5732379||Jun 7, 1995||Mar 24, 1998||Itt Automotive Europe Gmbh||Brake system for a motor vehicle with yaw moment control|
|US5736939||Dec 11, 1996||Apr 7, 1998||Caterpillar Inc.||Apparatus and method for determing a condition of a road|
|US5737224||Jun 7, 1995||Apr 7, 1998||Robert Bosch Gmbh||Apparatus and method for tripping a system for the protection of occupants of a vehicle|
|US5740041||Oct 19, 1995||Apr 14, 1998||Toyota Jidosha Kabushiki Kaisha||Vehicle occupant restraint system responsive to accelleration|
|US5740877||Dec 21, 1995||Apr 21, 1998||Nissan Motor Co., Ltd.||Driving-torque distribution control system for four-wheel drive vehicles|
|US5742918||Apr 26, 1996||Apr 21, 1998||Ford Global Technologies, Inc.||Method and apparatus for dynamically compensating a lateral acceleration of a motor vehicle|
|US5742919||Apr 26, 1996||Apr 21, 1998||Ford Global Technologies, Inc.||Method and apparatus for dynamically determining a lateral velocity of a motor vehicle|
|US5762406||Nov 14, 1996||Jun 9, 1998||Aisin Seiki Kabushiki Kaisha||Vehicle motion control system involving priority oversteer and understeer restraining control|
|US5782543||Oct 3, 1996||Jul 21, 1998||Toyota Jidosha Kabushiki Kaisha||Stability control device of vehicle compatible with foot braking|
|US5787375||Apr 1, 1996||Jul 28, 1998||Ford Global Technologies, Inc.||Method for determining steering position of automotive steering mechanism|
|US5801647||Sep 6, 1996||Sep 1, 1998||Vaisala Oy||Method and apparatus for measuring road surface conditions|
|US5809434||Apr 26, 1996||Sep 15, 1998||Ford Global Technologies, Inc.||Method and apparatus for dynamically determically determining an operating state of a motor vehicle|
|US5816670||Dec 4, 1996||Oct 6, 1998||Toyota Jidosha Kabushiki Kaisha||Vehicle brake control device|
|US5825284||Dec 10, 1996||Oct 20, 1998||Rollover Operations, Llc||System and method for the detection of vehicle rollover conditions|
|USRE30550||Apr 18, 1979||Mar 24, 1981||Durrell U. Howard||Automatic trailer sway sensing and brake applying system|
|1||A method for reducing on-road rollovers-anti-rollover braking, Thomas J. Wielenga, Dynamotive, LLC, International Congress and Exposition, Detroit, Michigan, Mar. 1-4, 1999.|
|2||Chen, Bo-Chiuan, Peng, Huei; "A Real-time Rollover Threat Index for Sports Utility Vehicles", Proceedings of the American Control Conference, San Diego, CA, Jun. 1999.|
|3||Eger, R., Kiencke, U., "Modeling of rollover sequences", Control Engineering Practice 11 (2003) 209-216.|
|4||Eger, R., Majjad, R., Naser, N., "Rollover simulation based on a nonlinear model", SAE 98020.|
|5||Nalecz, A.G., Bindemann, A.C., Brewer H.K., "Dynamic analysis of vehicle rollover", 12<SUP>th </SUP>International Conference on Experimental Safety Vehicles, Goteborg, Sweden, May 29-Jun. 1, 1989.|
|6||Niii, N., Nishijima, Y., Nakagaw, K., "rollover analysis method of a large-size bus", JSAE 9540020, 1995.|
|7||U.S. Appl. No. 10/459,697, filed Jun. 11, 2003, Lu.|
|8||U.S. Appl. No. 10/608,909, filed Jun. 27, 2003, Lu.|
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|U.S. Classification||340/440, 701/45, 701/70, 340/465, 701/42, 340/439, 701/71, 340/441, 701/46|
|International Classification||B60Q1/00, B60T8/1755, B60R16/02, B60R16/023|
|Cooperative Classification||B60G2800/952, B60G2400/32, B60G2800/012, B60T2240/06, B60G2400/208, B60G2800/70, B60R16/0233, B60T2230/03, B60G2800/9124, B60T8/17551|
|European Classification||B60R16/023D3F, B60T8/1755B|
|Mar 18, 2013||FPAY||Fee payment|
Year of fee payment: 12