WO2000063545A1 - Identification of diesel engine injector characteristics - Google Patents
Identification of diesel engine injector characteristics Download PDFInfo
- Publication number
- WO2000063545A1 WO2000063545A1 PCT/US2000/008613 US0008613W WO0063545A1 WO 2000063545 A1 WO2000063545 A1 WO 2000063545A1 US 0008613 W US0008613 W US 0008613W WO 0063545 A1 WO0063545 A1 WO 0063545A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- fuel injector
- fuel
- injection system
- fuel injection
- injector
- Prior art date
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
- F02D41/20—Output circuits, e.g. for controlling currents in command coils
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- 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
- F02D41/24—Electrical control of supply of combustible mixture or its constituents characterised by the use of digital means
- F02D41/2406—Electrical control of supply of combustible mixture or its constituents characterised by the use of digital means using essentially read only memories
- F02D41/2409—Addressing techniques specially adapted therefor
- F02D41/2412—One-parameter addressing technique
-
- 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
- F02D41/24—Electrical control of supply of combustible mixture or its constituents characterised by the use of digital means
- F02D41/2406—Electrical control of supply of combustible mixture or its constituents characterised by the use of digital means using essentially read only memories
- F02D41/2425—Particular ways of programming the data
- F02D41/2429—Methods of calibrating or learning
- F02D41/2432—Methods of calibration
- F02D41/2435—Methods of calibration characterised by the writing medium, e.g. bar code
-
- 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
- F02D41/24—Electrical control of supply of combustible mixture or its constituents characterised by the use of digital means
- F02D41/2406—Electrical control of supply of combustible mixture or its constituents characterised by the use of digital means using essentially read only memories
- F02D41/2425—Particular ways of programming the data
- F02D41/2429—Methods of calibrating or learning
- F02D41/2451—Methods of calibrating or learning characterised by what is learned or calibrated
- F02D41/2464—Characteristics of actuators
- F02D41/2467—Characteristics of actuators for injectors
-
- 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
- F02D41/20—Output circuits, e.g. for controlling currents in command coils
- F02D2041/202—Output circuits, e.g. for controlling currents in command coils characterised by the control of the circuit
- F02D2041/2065—Output circuits, e.g. for controlling currents in command coils characterised by the control of the circuit the control being related to the coil temperature
Definitions
- the present invention relates to a method and apparatus for incorporating an identifying resistance into a fuel injector to provide an indication of characteristics of the particular injector.
- Fuel injectors are utilized to assist in the injection of fuel du ⁇ ng operation of a diesel engine With manufactu ⁇ ng tolerances, etc.. each fuel injector has distinct characte ⁇ stics Fuel injectors have two characteristics that are important to control of the fuel injection process. First, an offset characteristic is defined, and second, a slope of change of the fuel injection ability is defined. As these two characte ⁇ stics vary, an optimum control for the particular fuel injector also vanes. Thus, an optimum control would be aware of the characte ⁇ stics for a particular injector.
- each fuel injector be tested to determine both the offset and slope, and that an identifier be put into the fuel injector to tell an engine control the offset and slope which applies for the particular injector
- the OEM proposed having a dedicated control, such as a microprocessor, incorporated into the fuel injector to send an identifying signal.
- the present invention is directed to achieving the identification with a much simpler and lower cost solution.
- a fuel injector is tested after assembly, and its offset and slope determined.
- the offset and slope information is then used to characte ⁇ ze the fuel injection into one of several particular types.
- a characte ⁇ zation resistor of a value indicative of the "type" of injector is then incorporated into a circuit associated with the fuel injector.
- the diesel engine control can query the fuel injector, and read the voltage due to the characte ⁇ zation resistor to determine the "type" of fuel injector.
- the "type” is then associated with a particular offset and slope for the fuel injector The control will then know how to optimally control the particular fuel injector.
- the fuel injector is provided a coil to open the injector, and a separate coil to close the injector.
- Each coil is provided with a high side and a low side dnver which are powered to operate the coils in normal operation.
- the system automatically scans the characte ⁇ zation resistor of each injector to determine each cylinder's injector "type" Identification current is passed through the characte ⁇ zation resistor, which is connected to the high side of coil A and the low side of coil B.
- Identification current is passed through the characte ⁇ zation resistor, which is connected to the high side of coil A and the low side of coil B.
- the voltage across the characte ⁇ zation resistor is measured at the high side of coil A
- This voltage is then associated with a prestored code, which in turn tells the control which type of fuel injector is associated with the particular voltage.
- the present invention thus provides a simple way of identifying each fuel injector type.
- One particular benefit of this invention is that the wire harness to the fuel injector need not have any additional wire to provide the identification feature.
- a control method is also disclosed wherein the identification of the particular fuel injector is only performed if the temperature of the control module is below a predetermined temperature. Applicant recognizes that if the control module is above a relatively high predetermined temperature, then the vehicle has not been stopped for any length of time. The need to redetermine each fuel injector type only occurs when a fuel injector has been replaced. The replacement of a fuel injector would require a long shutdown time for the engine. If the temperature of the control is above the predetermined temperature, an assumption can be made that the vehicle has not been shut down long enough to replace a fuel injector.
- each of the fuel mjectors are again quened.
- a control signal is sent to each of the fuel injectors, and the voltage from the charactenzation resistor is read.
- the voltage is again associated with a particular type of fuel injector, and the particular type of fuel injector is stored at the control. The control then knows how to optimally operate the particular fuel injector.
- a second distinct feature of this invention relates to the types of characte ⁇ stics associated with an identifying quantity which increases.
- the increasing quantities increase such that each next voltage is assigned to a combination of the two characte ⁇ stics that only changes in one of the two charactenstics This will be explained with reference to a two-dimensional arra> . where the "types" are stored in a spiral fashion
- Figure 1 is a graph of a test result for identifying particular types of fuel injectors.
- Figure 2 shows a way of sto ⁇ ng information from the test results of Figure 1.
- Figure 3 is a first flow chart of the present invention.
- Figure 4 is a continuation of Figure 3 flow chart according to the present invention.
- Figure 5 is a schematic view of an overall diesel engine injector identification circuit.
- Figure 6A shows the injector identification circuit associated with one of the fuel injectors.
- Figure 6B shows the circuit of Figure 6A as it would effectively be du ⁇ ng an identification mode.
- Figure 7 shows the identification circuitry for the present invention.
- Figure 8 is a logic state diagram for the fuel injector identification according to this invention.
- Figure 9 is a chart of preferred charactenzation resistances
- fuel injectors can be charactenzed by a first quantity called “offset” and a second quantity called “slope"
- offset and slope are determined by testing the fuel injector for two qualities
- the two qualities are the time it takes to inject three cubic millimeters of fuel, and second the time to inject eight cubic millimeters of fuel
- the amounts of injected fuel would maintain the engine at a low idle
- charactenzation of an offset and a slope for a fuel injector is pnor art, and developed by one of Applicant's customers This characte ⁇ zation forms no portion of the invention
- a particular fuel injector has its first time at an intermediate position and its second time at a relatively high position
- the line 20 crosses the axis C at a low point This would thus be a "low" offset
- a fuel injector defined by line 22 crosses the line C at a much higher offset
- the line 22 has a much lower slope than the line 20
- the fuel injector defined by line 24 crosses axis C at an intermediate offset position, and further has a slope which is between the slopes of the lines 20 and 22
- the fuel injector charactenzed by the line 20 could be said to have a low offset and a high slope
- the fuel injector characterized by the line 22 could be said to have a high offset, but a low slope
- the fuel injector charactenzed by the line 24 could be said to have a medium offset and a medium slope
- Figure 2 shows a way of assigning an incremental value to each of the nine possible combinations of characte ⁇ stics
- a two-dimensional array is provided which graphs slope between low, medium and high and offset between low, medium and high
- Each possible combination of the values is graphically represented by a particular incrementally advancing number
- Applicant has found that by stonng these numbers in a spiral fashion, the likelihood of a misreading will be reduced
- each of the increasing numbers is associated with an increasing voltage (or other elect ⁇ cal charactenstic) If the voltage values were assigned increasing in a fashion such that at the end of a row, one moves to the beginning of the row to begin assigning numbers, then a greater misreading could occur than would occur with a spiral array This is because if the values increase, a misreading of a voltage would most likely occur between two adjacent values Thus, a misreading between three and eight is unlikely, whereas a misreading between three and four is more likely With the arrangement as set forth in Figure 2, a misreading between three and four would still result
- the present invention thus provides the benefit of minimizing detnmental effect due to a voltage misreading. While the spiral array is most preferred, simply moving nght to left, then left to ⁇ ght and then nght to left, or alternatively up, then down, then up would also provide a similar benefit.
- the present invention incorporates a characte ⁇ zation resistor into each fuel injector once the particular "type" of fuel injector has been determined.
- the details of this incorporation will be explained below
- the basic flow chart and method of this invention can be understood from Figures 3 and 4.
- any existing initialization that may also be included in the control is performed
- the fuel injector identification steps then begin
- the control first asks if the module or engine temperature is above a predetermined temperature, here sixty degrees centigrade The reason for this is to determine whether the vehicle has been shut down for a length of time. If the vehicle is above the predetermined temperature, then it can be assumed the vehicle has not been shut down for any length of time
- the identification must be repeated each time a fuel injector has been replaced.
- the voltage is compared to a minimum and maximum value to determine the validity of the sensed voltage. As an example, if the voltage is lower than a predetermined value, then the system declares an error and uses the previously stored value for that particular fuel injector If the voltage is above the low predetermined value then the voltage is compared to a high value. Again, if the voltage is above that high value, an enor is reported and the previous value is utilized If an enor is reported, the flow chart then goes to incrementally increasing the cylinder number, and asking if the cylinder number is the last (here 8) If the answer is yes, then the control moves to running the injectors.
- the system returns to point B in the Figure 3 flow chart. If the voltage appears to be proper (that is between the high and low values), then the voltage is compared to prestored values to assign a particular fuel injector type to the fuel injector. The assigned type is then used to associate slope and offset. Either the type or the slope and offset are stored at the control for each fuel injector When the control begins to run the fuel injectors, this information is utilized to optimize the operation of each fuel injector.
- FIG. 5 shows a partial schematic diagram for the control of the diesel engine and its fuel injectors.
- Each fuel injector 30 is shown with its characte ⁇ zation resistor 32.
- each of the injectors have an individual characte ⁇ zation resistor 32
- the characterization resistors may be of several types across any one diesel engine, and there may be more than one of any one type Again, this is determined based upon the characteristics of each fuel injector as manufactured.
- Figure 6 A shows the circuitry 30 for d ⁇ ving each injector.
- An important feature of this circuit configuration is that no additional wi ⁇ ng is required within the engine to control module harness.
- Each injector has an open 34 and close 40 coil.
- the open coil 34 causes the injector to open and the close coil 40 causes the injector to close.
- the open coil 34 is provided with a high dnver 36 and a low dnver 38.
- a charactenzation resistance 32 the only component of this circuit not located in the control module, is placed in se ⁇ es with a resistance 33, which is in turn connected to a power supply 35, which is preferably 48 volts.
- the close coil 40 is provided with a high side dnver 42 and a low side dnver 44.
- the charactenzation resistor 32 is selected to have such a high resistance that du ⁇ ng normal operation very little current will flow through the characterization resistance, and thus the operation of the coil 40 is not affected by the inclusion of the characte ⁇ zation resistor.
- the value of the characterization resistor is preferably low enough that the leakage current of the high side driver 36 at the module temperature du ⁇ ng the injector identification process is insignificant
- the control is provided with the ability to turn on only dnver 44 for coil 40 such that the current must flow through the charactenzation resistor 32.
- the circuit effectively becomes that which is shown in Figure 6B
- the charactenzation resistor 32 now controls the voltage leaving the circuit at 46, and being read by the control.
- a resistance 69 is shown, which is the effective resistance which is va ⁇ ed by the vanable characte ⁇ zation resistors 32
- resistors 60 and 61 scale the voltage to the output 46, even du ⁇ ng normal operation
- the resistances 62 and 69 are effectively set by a combination of the resistances including resistor 32
- the other resistances are selected to be sufficiently high such that differentiations between the individual charactenzation resistor 32 still can be detected at output 46
- the control thus has the ability to turn on one dnver for one coil and read the characterization resistance
- the low side dnver 44 for the close coil 40 is connected such that when it is on and the other dnvers are off, the charactenzation resistance will result in an expected unique range of charactenzation voltage being readable on the output 46 for each type classification.
- Figure 7 schematically shows the systems for energizing the particular dnvers at the particular time Inputs 50, 52, 54 and 56 selectively dnve the particular dnvers.
- the system is shown with only two low side dnvers 100 with one being shared by all open and all close coils of all the fuel injectors. In other systems a separate low side dnver may be associated with each coil and cylinder.
- each fuel injector at each cylinder is quened with the proper low side dnver powered.
- a worker in this art would recognize how to provide this function, and the circuit of Figure 7 is but one example.
- Figure 8 is a timing diagram showing the inputs to points 50, 52, 54 and 56 to result in control of each of the eight fuel injectors such that each of the injectors is queried in order
- the exact details of how the particular cylinder is quened are within the skill of a worker in this art It is the inclusion of the identification resistance, and the relatively inexpensive and simple result of providing an identification of each fuel injector type which is the mam inventive feature here.
- Normal signal processing such as scaling the output of the characte ⁇ zation resistor, and reading through an analog to digital converter are preferably utilized.
- the value of the characte ⁇ zation resistor 32 is chosen to be high (as an example greater than 500 OHMS), such that its effect on normal operation is undetectable.
- the wetting current for the charactenzation resistor when its dnver is energized is accomplished by the resistor 33 in combination with the other resistors in the circuit, such as is shown in Figure 6A.
- the senes combination of the resistors 60 and 61 is preferably high enough such that it does not affect the ability to differentiate different values of the charactenzation resistor 32
- the use of the resistors 60 and 61 will ensure that the output 46 going to the multiplexing portion of the control will not be the full 48 volts, even under normal operation.
- the "high" impedance of the resistor combination permits the addition of a simple voltage limiting diode to line 46 assunng that the full 48 V cannot reach the multiplexer even when the injector is miswired. It is desirable for a much lower voltage to be the maximum input to most multiplexers.
- the level shifters 150 as shown in Figure 7 may be eliminated if they are unnecessary to the circuit operation.
- the elements 152 are a plurality of analogy switches which is associated with each of the individual cylinders.
Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP00919978A EP1171701B1 (en) | 1999-04-16 | 2000-03-31 | Identification of diesel engine injector characteristics |
DE60015745T DE60015745T2 (en) | 1999-04-16 | 2000-03-31 | DETECTION OF CHARACTERISTICS OF A FUEL INJECTION VALVE FOR DIESEL ENGINES |
JP2000612611A JP3723080B2 (en) | 1999-04-16 | 2000-03-31 | Diesel engine injector characteristics identification method |
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US12980899P | 1999-04-16 | 1999-04-16 | |
US60/129,808 | 1999-04-16 | ||
US16283499P | 1999-11-01 | 1999-11-01 | |
US60/162,834 | 1999-11-01 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2000063545A1 true WO2000063545A1 (en) | 2000-10-26 |
Family
ID=26827931
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/US2000/008613 WO2000063545A1 (en) | 1999-04-16 | 2000-03-31 | Identification of diesel engine injector characteristics |
Country Status (5)
Country | Link |
---|---|
US (1) | US6516658B1 (en) |
EP (1) | EP1171701B1 (en) |
JP (1) | JP3723080B2 (en) |
DE (1) | DE60015745T2 (en) |
WO (1) | WO2000063545A1 (en) |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2002053896A3 (en) * | 2001-01-04 | 2003-02-13 | Siemens Vdo Automotive Corp | Internal energizable voltage or current source for fuel injector identification |
FR2846714A1 (en) * | 2002-10-31 | 2004-05-07 | Siemens Ag | Injection valve control circuit for motor vehicle Diesel internal combustion engine uses calibration resistances to classify elements with switching for calibration power source |
WO2008132068A1 (en) * | 2007-04-27 | 2008-11-06 | Siemens Aktiengesellschaft | Method and data storage medium for reading and/or storing injector-specific data for controlling an injection system of an internal combustion engine |
EP1457668A3 (en) * | 2003-03-14 | 2008-12-17 | Denso Corporation | Fuel injection system for internal combustion engine |
WO2011064175A1 (en) * | 2009-11-30 | 2011-06-03 | Continental Automotive Gmbh | Classification method for an injector, calibration method for a characteristic map of an injector, and test bench device for an injector |
Families Citing this family (8)
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US6536268B1 (en) * | 1999-11-01 | 2003-03-25 | Siemens Vdo Automotive Corporation | Utilizing increasing width for identification voltages |
US6977591B2 (en) * | 2001-08-23 | 2005-12-20 | Visteon Global Technologies, Inc. | Smart power control technique to reduce power and heat consumption |
DE10312914A1 (en) * | 2003-03-22 | 2004-10-07 | Robert Bosch Gmbh | Fuel injection valve and internal combustion engine system |
US7191078B2 (en) * | 2003-11-25 | 2007-03-13 | Wolff Controls Corporation | Offset compensated position sensor and method |
US20060265159A1 (en) * | 2004-11-23 | 2006-11-23 | Wolff Controls Corporation | Offset Compensated Position Sensor and Method |
JP4678545B2 (en) * | 2008-07-25 | 2011-04-27 | 株式会社デンソー | Motor drive device |
JP5287839B2 (en) * | 2010-12-15 | 2013-09-11 | 株式会社デンソー | Fuel injection characteristic learning device |
US9541022B2 (en) * | 2014-04-28 | 2017-01-10 | Caterpillar Inc. | Electronic control module with driver banks for engines |
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2000
- 2000-03-27 US US09/536,365 patent/US6516658B1/en not_active Expired - Fee Related
- 2000-03-31 JP JP2000612611A patent/JP3723080B2/en not_active Expired - Fee Related
- 2000-03-31 EP EP00919978A patent/EP1171701B1/en not_active Expired - Lifetime
- 2000-03-31 WO PCT/US2000/008613 patent/WO2000063545A1/en active IP Right Grant
- 2000-03-31 DE DE60015745T patent/DE60015745T2/en not_active Expired - Lifetime
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Cited By (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2002053896A3 (en) * | 2001-01-04 | 2003-02-13 | Siemens Vdo Automotive Corp | Internal energizable voltage or current source for fuel injector identification |
US6651629B2 (en) | 2001-01-04 | 2003-11-25 | Mccoy John C. | Internal energizable voltage or current source for fuel injector identification |
FR2846714A1 (en) * | 2002-10-31 | 2004-05-07 | Siemens Ag | Injection valve control circuit for motor vehicle Diesel internal combustion engine uses calibration resistances to classify elements with switching for calibration power source |
US7253539B2 (en) | 2002-10-31 | 2007-08-07 | Siemens Aktiengesellschaft | Circuit arrangement and method for sequential classification of a plurality of controllable components |
EP1457668A3 (en) * | 2003-03-14 | 2008-12-17 | Denso Corporation | Fuel injection system for internal combustion engine |
WO2008132068A1 (en) * | 2007-04-27 | 2008-11-06 | Siemens Aktiengesellschaft | Method and data storage medium for reading and/or storing injector-specific data for controlling an injection system of an internal combustion engine |
US8649960B2 (en) | 2007-04-27 | 2014-02-11 | Siemens Aktiengesellschaft | Method and data storage medium for reading and/or storing injector-specific data for controlling an injection system of an internal combustion engine |
WO2011064175A1 (en) * | 2009-11-30 | 2011-06-03 | Continental Automotive Gmbh | Classification method for an injector, calibration method for a characteristic map of an injector, and test bench device for an injector |
Also Published As
Publication number | Publication date |
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EP1171701B1 (en) | 2004-11-10 |
US6516658B1 (en) | 2003-02-11 |
JP2003525376A (en) | 2003-08-26 |
DE60015745T2 (en) | 2006-06-22 |
JP3723080B2 (en) | 2005-12-07 |
DE60015745D1 (en) | 2004-12-16 |
EP1171701A1 (en) | 2002-01-16 |
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