EP0837984A1 - Verfahren und vorrichtung zur steuerung einer brennkraftmaschine - Google Patents
Verfahren und vorrichtung zur steuerung einer brennkraftmaschineInfo
- Publication number
- EP0837984A1 EP0837984A1 EP97915336A EP97915336A EP0837984A1 EP 0837984 A1 EP0837984 A1 EP 0837984A1 EP 97915336 A EP97915336 A EP 97915336A EP 97915336 A EP97915336 A EP 97915336A EP 0837984 A1 EP0837984 A1 EP 0837984A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- torque
- setpoint
- value
- filling
- internal combustion
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/02—Circuit arrangements for generating control signals
- F02D41/14—Introducing closed-loop corrections
- F02D41/1497—With detection of the mechanical response of the engine
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D37/00—Non-electrical conjoint control of two or more functions of engines, not otherwise provided for
- F02D37/02—Non-electrical conjoint control of two or more functions of engines, not otherwise provided for one of the functions being ignition
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/02—Circuit arrangements for generating control signals
- F02D41/04—Introducing corrections for particular operating conditions
- F02D41/10—Introducing corrections for particular operating conditions for acceleration
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D43/00—Conjoint electrical control of two or more functions, e.g. ignition, fuel-air mixture, recirculation, supercharging or exhaust-gas treatment
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D2250/00—Engine control related to specific problems or objectives
- F02D2250/18—Control of the engine output torque
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D2250/00—Engine control related to specific problems or objectives
- F02D2250/18—Control of the engine output torque
- F02D2250/22—Control of the engine output torque by keeping a torque reserve, i.e. with temporarily reduced drive train or engine efficiency
Definitions
- the invention relates to a method and a device for controlling an internal combustion engine according to the preambles of the independent claims.
- a setpoint for a torque of the internal combustion engine is specified by the driver or in special operating states by other control or regulating systems. This setpoint is firstly converted into a target fill value and then into one
- Setpoint for controlling the air supply to the internal combustion engine for example implemented via a throttle valve, on the other hand in an ignition angle setting and / or a number of cylinders to which the fuel supply is interrupted.
- Performance parameters of the internal combustion engine the actual torque of the internal combustion engine is approximated to the predetermined target torque value.
- torque reduction is desired in an internal combustion engine (if the setpoint is specified accordingly), this is generally set with the desired dynamics, since the intervention in the ignition angle, the fuel supply to the cylinders, and / or which acts very quickly on the torque the engine torque can be reduced immediately in the mixture composition. The slower filling intervention is superimposed on this rapid torque change when torque is reduced. If, however, an increase in torque is required, this can only be carried out by increasing the charge, provided all cylinders are fired, the mixture composition is stoichiometric and the ignition angle is not delayed. However, the dynamics of this charge increase is limited by the dynamics of the throttle valve actuator and / or the intake manifold dynamics.
- the object of the invention is to optimize the dynamics of the control of the torque of an internal combustion engine, at least in some operating states.
- Torque increase is optimized. It is particularly advantageous that, even in such operating states, the actual torque of the internal combustion engine essentially follows the target torque with the required dynamics.
- the solution according to the invention is particularly advantageous in operating states in which the change in torque, in particular the torque build-up, is already known in advance. This applies, for example, when the driver changes the torque using the pedal, when a traction control or engine drag torque controller intervenes, a driving dynamics controller or similar control systems, when loads such as air conditioning are activated, when starting and / or during warm-up in connection with catalyst heating measures.
- the torque change is carried out dynamically correctly by splitting the torque setpoint into a setpoint for the filling path and a setpoint for the quick interventions, which can take different values.
- FIG. 1 shows the structure using an overview block diagram the torque control according to the invention.
- FIGS. 4 and 5 block diagrams are shown, which show a preferred embodiment.
- FIG. 6 shows on the basis of time diagrams when using the solution according to the invention.
- FIG. 1 shows an electronic control unit 10 for controlling the torque of an internal combustion engine, which contains at least one microcomputer, not shown.
- the programs implemented in the microcomputer are shown as blocks in FIG. About the
- the control unit 10 influences the air supply to the internal combustion engine, the fuel supply (suppression and / or mixture composition) and the ignition angle of the internal combustion engine.
- the operating variables processed for torque control are fed to the control unit 10 via input lines 20, 22 and 24 to 26.
- a setpoint value for a torque is supplied to the control unit 10 by at least one further control unit 28, for example a traction control unit.
- a signal representing the degree of actuation ⁇ is supplied to the control unit 10 via the input line 22 by a measuring device 30 for detecting the accelerator pedal actuation. Furthermore, the control unit 10 from measuring devices 32 to 34 via the
- Input lines 24 to 26 are supplied with signals which represent further operating variables of the internal combustion engine and / or the vehicle, for example engine speed, engine load, engine temperature, etc.
- the operating variables supplied to the control unit 10 are separated in a first program block 36 in the manner described below into a target torque value MI target-L for the filling path and into a target value MI target for influencing the fuel metering and / or the ignition angle.
- the torque setpoint MI Soll-L for the filling path is entered in a subsequent program block 38, taking into account selected operating variables which are supplied to the control unit 10 via the lines 24 to 26, or variables derived therefrom in the manner known from the prior art mentioned at the outset Filling setpoint rl SoU converted.
- This setpoint charge value is converted in program block 40, as described in the prior art mentioned at the outset, in the context of control loops into a control signal for an electrically actuable throttle valve for adjusting the air supply.
- the filling of the internal combustion engine is therefore set in such a way that it approximates the target value and thus the actual torque the target torque value.
- the torque setpoint MI Soll for the rapid torque intervention is converted in the known manner in the program block 42 into control signals for the mixture supply (cylinder blanking and / or setting the mixture composition) and / or for setting the ignition angle and output via the lines 14 and 16 shown symbolically.
- the basic idea of the solution according to the invention is that an existing torque setpoint is separated into a setpoint for the filling path and the ignition angle path.
- the two setpoints In at least one operating state, the two setpoints have different torque values and are implemented in parallel with one another by adjusting the filling or fuel supply and / or ignition angle. It is provided in a preferred embodiment that the separation takes place only when the future value of the torque setpoint is greater than the current setpoint, ie in the event of torque increases.
- Figure 2 shows a first embodiment of the separation of the torque setpoints. The solution shown is used when the driver's request derived from the actuation signal ⁇ changes in the direction of increasing torques. It is assumed that only the driver's request determines the target torque and that there are no further interventions (for example from traction control).
- the torque MI Ped set by the driver via the pedal actuation is determined from the actuation degree signal ⁇ and at least the engine speed N Mot .
- This pedal torque is interpolated between a minimum and a maximum torque value in the subsequent interpolation program 102. These values are predetermined and are preferably at least speed-dependent.
- the driver's desired torque MIFAR formed by the interpolation is then filtered in the filter element 104 in accordance with a predetermined filter function (eg low-pass filter of the 1st order). The filtered value is considered in the described operating situation as the target torque MI target and the block 42 for determining the influencing of the
- the block 42 calculates from the supplied setpoint torque value setpoints for the number of cylinders to be blanked (RED setpoint ) a setpoint value for the mixture composition ⁇ setpoint and a setpoint value for the ignition angle setting (ZW setpoint ). These are set via the symbolic output lines 14 and 16.
- the filtered setpoint torque value MI setpoint is in one preferred exemplary embodiment also the target torque value evaluated for determining the target filling.
- the setpoints which are separate for filling path and quick interventions, assume different values.
- the determination of the target filling value is then based not on the filtered target torque value but on the unfiltered target torque value MIFAR.
- This setpoint torque value is fed to program block 38 for determining setpoint charge rl setpoint , which in turn is converted in program block 40 into control signals for a throttle valve and possibly a turbocharger for influencing the cylinder charge.
- the target torque value is only achieved by adjusting the filling and the ignition angle. It must be ensured that the target torque specified by the driver or other regulating or control systems can actually be set. Adjustable ignition angles must therefore be taken into account at the latest for the respective operating point.
- This firing angle is a function of operating variables, preferably the engine speed and the engine load, and is determined by the running limit of the engine. According to the broken line in FIG. 2, in this case the target torque specified for the air path is limited on the basis of the target torque MI target to be set and at least the latest possible ignition angle. In this way, the torque change specified by the driver can be implemented by adjusting the filling and quickly adjusting the ignition angle. The actual torque is then quickly brought to the target torque.
- the target torque for the air path MI soii is - L o f the basis of a minimum value selector 200 from the corrected in accordance with the ZündwinkelPlus desired torque value MI target and a predetermined for the charge path unlimited target value MI target L "determined.
- the optimal ignition angle ZWo pt at which the internal combustion engine has the highest efficiency
- the basic ignition angle at the current operating point ZW Base which enables the ignition angle setting without external intervention (for example by traction control) and the ignition angle ZWM that can be set as late as possible at the current operating point is stored.
- the basic ignition angle describes the ignition angle that is set at the current operating point of the internal combustion engine without external intervention.
- the difference between the optimal ignition angle and the basic ignition angle 1 is formed in a first connection point 208, while the difference between the optimal and the latest possible ignition angle is formed in a second connection point 210.
- correction moments etazwbase, etazwm
- efficiency curves 212 and 214 These correction torques represent the change in efficiency or the change in torque that would occur when setting the respective ignition angle owing to the deviation from the optimum value.
- the correction values are used to correct the
- Target torque value MI target The ignition angle set in the current operating point is the basic ignition angle.
- the greatest change in torque can be achieved by setting the latest possible ignition angle.
- the target torque for the filling must therefore be down to a predetermined minimum value be limited to ensure that the desired target torque can be achieved by changing the charge and adjusting the ignition angle.
- This lower limit forms the corrected target torque MI target for the ignition angle intervention.
- the correction takes into account the latest possible setting of the ignition angle by dividing the setpoint by the efficiency etazwm (division point 216).
- the result sets the target torque value when setting the latest possible ignition angle.
- the corrected target torque value is multiplied in multiplication position 218 by the efficiency of the basic ignition angle in order to obtain the optimum torque to be set.
- the result is the target torque value, which can be adjusted from the basic ignition angle using the largest possible ignition angle adjustment.
- the target torque for the filling must not fall below this value, since otherwise the target torque MI target cannot be realized.
- a minimum value selection between the two values is therefore carried out in the minimum value selection stage 200 and the smaller desired value is fed into the conversion into the desired filling value.
- a second exemplary embodiment is the increase in the setpoint for the filling path in certain operating situations, which automatically leads to a retardation of the ignition angle. These operating situations occur in particular when the idle control is active, when the catalytic converter is active and / or during the
- the reserve torque can have different reference points. In particular, it can be related to the optimal moment (moment with the highest efficiency) or to the currently effective moment.
- FIG. 4 shows a first embodiment for the specification in the filling path, which is used in particular by an idle control or in catalyst heating functions.
- the torque setpoint MI Soll which is specified by the driver or other control or regulating systems and is used to set the ignition angle and the further output variables which bring about a rapid change in torque, is passed to a linking point 300.
- the torque reserve value DMROPT stored in the memory location 302 is added in this connection point.
- the torque reserve is either fixed or stored in a characteristic curve depending on the operating parameters. Operating variables are, for example, engine speed, engine temperature, the equipment in the vehicle, the time after starting, etc.
- the sum of the torque setpoint and the torque reserve is calculated in a multiplication point 302 by
- Base ignition angles1 Efficiency which is also the basis for the calculation of the target filling value, multiplied.
- the result is shown in a preferred embodiment
- the maximum value selection stage 304 is compared with the target torque value MI target and the larger of the two values is output as the target torque for the air path MI target-L .
- the reserve torque is related to the optimal values (optimal torque, optimal ignition angle). This allows a defined ignition angle to be set in a stationary manner. The multiplication by the basic ignition angle efficiency is used to calculate the reference point for converting the target torque value for the filling path into a target filling value.
- a limitation of the setpoint torque value for the filling path is also necessary here.
- the limitation is made to the maximum ignition angle. Assuming that the basic ignition angle is the earliest possible ignition angle (the ignition angle is optimal with regard to the moment or at the knock limit), the maximum value selection ensures that too little filling is never specified. If the torque is additionally controlled by influencing the mixture and / or cylinder blanking, this limitation can be dispensed with.
- the torque reserve value is related to the momentarily effective torque, this limitation can be omitted and the much simpler structure according to FIG. 5 results.
- the torque setpoint for the filling path is obtained by adding the torque setpoint MI setpoint for the quick intervention and the reserve torque DMR.
- the rapid intervention is set in the exemplary embodiments according to FIGS. 4 and 5 in accordance with the target torque value MI target .
- the effect of the solution according to the invention, in particular according to the first exemplary embodiment, is illustrated using the example in FIG. 6.
- the time course of the target torque value MI target and of the torque contribution through the filling (dashed) is shown in FIG. 6a.
- Figure 6b is the
- the target torque is reduced at a time TO.
- the target torque value is achieved by adjusting the ignition angle and filling.
- the filling proportion decreases only slowly.
- the actual torque changes in accordance with FIG. 4c in accordance with the setpoint.
- the target torque is increased again at the time T1. Due to the separation according to the invention between the filling path and the ignition angle path, this torque increase is largely carried out by correcting the ignition angle.
- the advantageous effect is that the actual torque follows the target value almost exactly, even in the torque-increasing direction.
- the calculations are carried out on the basis of power values, the torque and power being related to the engine speed.
- the mixture composition or the fuel supply to a cylinder or any combination of these three variables instead of the ignition angle setting, the mixture composition or the fuel supply to a cylinder or any combination of these three variables.
- the torque determination based on the basic parameters, setting limit values, etc. must be applied accordingly.
Abstract
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19618893 | 1996-05-10 | ||
DE19618893A DE19618893A1 (de) | 1996-05-10 | 1996-05-10 | Verfahren und Vorrichtung zur Steuerung einer Brennkraftmaschine |
PCT/DE1997/000420 WO1997043531A1 (de) | 1996-05-10 | 1997-03-06 | Verfahren und vorrichtung zur steuerung einer brennkraftmaschine |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0837984A1 true EP0837984A1 (de) | 1998-04-29 |
EP0837984B1 EP0837984B1 (de) | 2000-06-07 |
Family
ID=7793968
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP97915336A Expired - Lifetime EP0837984B1 (de) | 1996-05-10 | 1997-03-06 | Verfahren und vorrichtung zur steuerung einer brennkraftmaschine |
Country Status (6)
Country | Link |
---|---|
US (1) | US6000376A (de) |
EP (1) | EP0837984B1 (de) |
JP (1) | JP3995718B2 (de) |
KR (1) | KR100406809B1 (de) |
DE (2) | DE19618893A1 (de) |
WO (1) | WO1997043531A1 (de) |
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- 1996-05-10 DE DE19618893A patent/DE19618893A1/de not_active Withdrawn
-
1997
- 1997-03-06 WO PCT/DE1997/000420 patent/WO1997043531A1/de active IP Right Grant
- 1997-03-06 JP JP54036497A patent/JP3995718B2/ja not_active Expired - Lifetime
- 1997-03-06 US US08/983,090 patent/US6000376A/en not_active Expired - Lifetime
- 1997-03-06 DE DE59701836T patent/DE59701836D1/de not_active Expired - Lifetime
- 1997-03-06 EP EP97915336A patent/EP0837984B1/de not_active Expired - Lifetime
- 1997-03-06 KR KR10-1998-0700138A patent/KR100406809B1/ko not_active IP Right Cessation
Non-Patent Citations (1)
Title |
---|
See references of WO9743531A1 * |
Also Published As
Publication number | Publication date |
---|---|
KR19990028837A (ko) | 1999-04-15 |
DE19618893A1 (de) | 1997-11-13 |
KR100406809B1 (ko) | 2004-02-18 |
US6000376A (en) | 1999-12-14 |
JPH11509910A (ja) | 1999-08-31 |
WO1997043531A1 (de) | 1997-11-20 |
EP0837984B1 (de) | 2000-06-07 |
DE59701836D1 (de) | 2000-07-13 |
JP3995718B2 (ja) | 2007-10-24 |
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