EP1157201B1 - System for operating an internal combustion engine, especially an internal combustion engine of an automobile - Google Patents

System for operating an internal combustion engine, especially an internal combustion engine of an automobile Download PDF

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Publication number
EP1157201B1
EP1157201B1 EP99973747A EP99973747A EP1157201B1 EP 1157201 B1 EP1157201 B1 EP 1157201B1 EP 99973747 A EP99973747 A EP 99973747A EP 99973747 A EP99973747 A EP 99973747A EP 1157201 B1 EP1157201 B1 EP 1157201B1
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EP
European Patent Office
Prior art keywords
pressure
fuel supply
internal combustion
combustion engine
detected
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.)
Expired - Fee Related
Application number
EP99973747A
Other languages
German (de)
French (fr)
Other versions
EP1157201A1 (en
Inventor
Thomas Frenz
Hansjoerg Bochum
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Priority to DE19908352 priority Critical
Priority to DE19908352A priority patent/DE19908352A1/en
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Priority to PCT/DE1999/002958 priority patent/WO2000052319A1/en
Publication of EP1157201A1 publication Critical patent/EP1157201A1/en
Application granted granted Critical
Publication of EP1157201B1 publication Critical patent/EP1157201B1/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02DCONTROLLING COMBUSTION ENGINES
    • F02D41/00Electrical control of supply of combustible mixture or its constituents
    • F02D41/30Controlling fuel injection
    • F02D41/38Controlling fuel injection of the high pressure type
    • F02D41/3809Common rail control systems
    • F02D41/3836Controlling the fuel pressure
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02DCONTROLLING COMBUSTION ENGINES
    • F02D41/00Electrical control of supply of combustible mixture or its constituents
    • F02D41/22Safety or indicating devices for abnormal conditions
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02DCONTROLLING COMBUSTION ENGINES
    • F02D41/00Electrical control of supply of combustible mixture or its constituents
    • F02D41/22Safety or indicating devices for abnormal conditions
    • F02D41/222Safety or indicating devices for abnormal conditions relating to the failure of sensors or parameter detection devices
    • F02D2041/223Diagnosis of fuel pressure sensors
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02DCONTROLLING COMBUSTION ENGINES
    • F02D41/00Electrical control of supply of combustible mixture or its constituents
    • F02D41/22Safety or indicating devices for abnormal conditions
    • F02D2041/224Diagnosis of the fuel system
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02DCONTROLLING COMBUSTION ENGINES
    • F02D41/00Electrical control of supply of combustible mixture or its constituents
    • F02D41/22Safety or indicating devices for abnormal conditions
    • F02D2041/224Diagnosis of the fuel system
    • F02D2041/225Leakage detection
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02DCONTROLLING COMBUSTION ENGINES
    • F02D41/00Electrical control of supply of combustible mixture or its constituents
    • F02D41/22Safety or indicating devices for abnormal conditions
    • F02D2041/227Limping Home, i.e. taking specific engine control measures at abnormal conditions
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02DCONTROLLING COMBUSTION ENGINES
    • F02D41/00Electrical control of supply of combustible mixture or its constituents
    • F02D41/30Controlling fuel injection
    • F02D41/38Controlling fuel injection of the high pressure type
    • F02D41/3809Common rail control systems
    • F02D41/3836Controlling the fuel pressure
    • F02D41/3845Controlling the fuel pressure by controlling the flow into the common rail, e.g. the amount of fuel pumped
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02DCONTROLLING COMBUSTION ENGINES
    • F02D41/00Electrical control of supply of combustible mixture or its constituents
    • F02D41/30Controlling fuel injection
    • F02D41/38Controlling fuel injection of the high pressure type
    • F02D41/3809Common rail control systems
    • F02D41/3836Controlling the fuel pressure
    • F02D41/3863Controlling the fuel pressure by controlling the flow out of the common rail, e.g. using pressure relief valves
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02TCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00Road transport of goods or passengers
    • Y02T10/10Internal combustion engine [ICE] based vehicles
    • Y02T10/40Engine management systems

Abstract

The invention relates to a method for operating a fuel supply system of an internal combustion engine, especially an internal combustion engine of an automobile. According to said method, fuel is conveyed into a storage chamber (17) and a pressure is generated in said storage chamber (17) by means of a pump (12,16). An actual value of this pressure is measured by a pressure sensor (21). The pressure in the storage chamber is then controlled and regulated to a desired value, any defect in the fuel supply system (10) being detected by a plausibility check. In the event that a defect is detected in the fuel supply system (10), a diagnosis cycle of the internal combustion engine is initiated, hereby activating diagnosis functions which test the operativeness of the individual components (18, 19, 21) of the fuel supply system (10).

Description

State of the art

The invention relates to a method and a device for operating a fuel supply system Internal combustion engine, in particular of a motor vehicle, at with the help of a pump fuel into a storage space promoted and a pressure is generated in the storage space an actual value of the pressure with the help of a pressure sensor is measured, and at which the pressure in the storage space a setpoint is controlled and regulated, an error in the fuel supply system by a Plausibility check is recognized.

From US 5,241,933 is a Fuel supply system known in which the Fuel pressure is regulated using a pressure regulator and in which an error detection device an error in Detects fuel supply system and this error with Is displayed using a display device. This will a differential pressure from an actual pressure and a set pressure educated. The differential pressure then becomes a correction value determined with which the setpoint value of the pressure is corrected.

The correction value also becomes one Fault detection device supplied in the checked whether the correction value is within one by two predetermined values formed allowable pressure range lies. If the correction value is outside this range, this is how a fault in the fuel supply system is recognized and displayed.

The present invention is based on the object To improve methods of the generic type in such a way that which is a fault in the fuel supply system causing component can be determined.

The object of the present invention is achieved with the Features of claim 1 solved.

Advantages of the invention

The particularly great advantage of the present invention lies in that an accurate diagnosis of the Fuel supply system without additional components is achieved.

Further advantages of the invention result in connection with the subclaims from the description below of embodiments.

drawing

Embodiments of the invention are shown in the drawing and explained in more detail in the following description.

Figure 1
shows a schematic representation of a fuel supply system of an internal combustion engine.
Figure 2
shows schematically the sequence of the diagnosis of the fuel supply system.
Figure 3
shows schematically the course of the diagnostic cycle upon detection of a fault in the fuel supply system.
Description of the embodiments

1 shows a fuel supply system 10 shown for use in an internal combustion engine is provided.

An electric fuel pump is in a fuel tank 11 (EKP) 12, a fuel filter 13 and a low pressure regulator 14 arranged.

The EKP 12 promotes the through the fuel filter 13 Fuel from the fuel tank 11. The fuel filter 13 has the task of foreign particles from the fuel filter out. With the help of the low pressure regulator 14 the fuel pressure in the low pressure range to one predetermined value regulated.

A fuel line 15 leads from the fuel tank 11 a high pressure pump 16. The high pressure pump 16 closes there is a storage space 17 on which injection valves 18 are arranged. The injection valves 18 are with the Storage space 17 connected and are preferably directly the Combustion chambers assigned to the internal combustion engine.

The fuel is produced using the electric fuel pump 12 from the fuel tank 11 via the fuel line 15 to High pressure pump 16 promoted. This turns the fuel on brought to a pressure of about 4-5 bar. The high pressure pump 16, which are preferably directly from the internal combustion engine is driven, compresses and delivers the fuel into a storage space 17. The fuel pressure reached here values of up to 120 bar. About the injectors 18, which can be controlled individually, the Fuel directly into the combustion chambers of the internal combustion engine injected.

A pressure sensor 21 and a pressure control valve 19 is direct connected to storage space 17. The pressure control valve 19 is connected on the input side to the storage space 17. A return line 20 leads to the output side Fuel line 15. Via signal and control lines 22, 23 are the pressure sensor 21 and the pressure control valve 19 with connected to a control unit 25.

Instead of a pressure control valve 19 can also Quantity control valve in a fuel supply system 10 come into use. For the sake of simplicity, following text only the pressure control valve 19 further described.

With the help of the pressure sensor 21, the actual value of the Detected fuel pressure in the storage space 17. About the Signal line 22 becomes the actual value to control unit 25 fed. In the control unit 25 is based on the detected Actual value of the fuel pressure, a control signal is formed, with which the pressure control valve 19 via the control line 23 is controlled.

In the control unit 25 are various functions that Control of the internal combustion engine are used to implement. In modern control units have these functions on one Computer programmed and then in a memory of the Control unit 25 filed. The ones stored in memory Functions are dependent on the requirements of the Internal combustion engine activated. Here, in particular tough demands on the real-time capability of the control unit 25 in connection with the functions. in principle is, however, a pure hardware implementation of the functions to control the internal combustion engine quite possible.

To control or regulate the pressure in the storage space 17 of the fuel supply system 10 serve, for example the functions of pressure control and pressure pilot control.

The pressure control function regulates faults that affect the Change the pressure in the storage space briefly. For this, the Output signal of the pressure sensor 21 with a setpoint compared. When a discrepancy between The output signal of the pressure sensor 21 and the target variable become on Generated signal with which the pressure control valve 19 is controlled and the deviation is corrected. Normally, i.e. if there is no fault, the output of the pressure regulator remains in zero or neutral position.

The pressure pre-control generates on the basis of a target size for the pressure a control signal for the pressure control valve 19. In general, the print pre-control describes this Behavior of the fuel supply system 10 so accurate that the pressure regulator only has to compensate for malfunctions and otherwise remains in neutral.

The pressure control and the pressure pre-control work in Principle parallel, the pressure control being dynamic and the pressure pre-control the stationary behavior of the pressure in the Affect storage space.

In Figure 2 is the sequence of a diagnosis of the Fuel supply system 10 shown.

A block 201 represents the normal operation of the Internal combustion engine. Normal operation means that the Internal combustion engine runs faultlessly, no emergency functions are activated and / or the diagnostic cycle is not activated is.

During normal operation 201 of the internal combustion engine Various reviews carried out on an ongoing basis. in the Block 202 becomes an electrical check of the pressure sensor 21 performed. At the same time in block 203 general plausibility check Fuel supply system 10 performed and in block 204 are the final stages of the pressure control valve 19 and High pressure injection valves 18 checked.

The electrical check of the pressure sensor 21 is carried out by Evaluation of the output signal of the pressure sensor 21 carried out. For this purpose, it is checked, for example, whether that Output signal values within a permissible range occupies. The output signal takes values outside the permissible range, then a short circuit or a Broken cable error detected. It can also be checked whether the timing of the output signal is a dependent typical form of the fuel supply system 10.

If an error of the pressure sensor 21 is detected in block 202, then is the error in block 205 using a Display device displayed and simultaneously in block 206 a corresponding emergency operation of the internal combustion engine set. For example, when an error is detected the pressure sensor 21 in emergency operation, the pressure control switched off, so that the pressure in the storage space 17 only is set by the print pre-control.

An error in the output stages of the pressure control valve 19 or High pressure injectors 18, by observing one Output voltage of the individual output stages recognized. differs the power amplifier voltage when switched on or switched off state of the power amplifiers essentially by one for the on or off state of the Output stages predetermined value, then a short circuit or Broken cables in the output stages detected.

If an error in the output stages of the Pressure control valve 19 or the high pressure injection valves 18th the error is detected in block 207 with the aid of a Display device displayed and simultaneously in block 208 a corresponding emergency operation of the internal combustion engine set.

Is checked in block 203 by a plausibility check of the Fuel supply system 10 is a general failure is recognized, then in a block 209 using a Display device of the errors displayed and on Diagnostic cycle of the internal combustion engine started and displayed. For this purpose, different are in block 210 Diagnostic functions activated to check the individual components of the fuel supply system 10 serve.

For example, a plausibility check of the Fuel supply system 10, wherein for pressure control in Storage space 17 in addition to the pressure regulator Print pre-control is carried out by the Output value of the pressure regulator with a predetermined Threshold is compared. If the exceeds Output value of the pressure regulator above a predetermined one Time period the threshold value, then a deviation of the Fuel supply system 10 of normal behavior or the print pre-control recognized. For this it is assumed that the print pre-control works properly and that stationary behavior of the fuel supply system 10 described sufficiently precisely.

FIG. 3 schematically represents the course of the diagnostic cycle represents.

In a step 301 (this step corresponds to the Step 203 in Figure 2) through the Plausibility check an error in the Fuel supply system 10 detected, so in one Step 302 of the diagnostic cycle started. Here are Diagnostic functions enabled the individual components of the fuel supply system 10 for functionality check.

For this purpose, output signals of the functions Misfire detection, smooth running control, lambda control, Mixture adaptation or leakage detection in a suitable manner evaluated and linked together.

In the following, signals are also used as output signals referred to, from an interim result of the above Functions can originate.

With the help of the misfire detection function shown in block 304, combustion misfires are detected on the basis of an air / fuel ratio that is too "rich" or "lean". Misfires in individual cylinders cause the individual cylinders to no longer deliver the same torque, which causes the internal combustion engine to run unevenly.

With the help of the smooth running control function shown in block 304, different emitted moments in the individual cylinders are recorded and compensated for by varying the injected fuel mass in the cylinders concerned.

With the aid of the lambda control function shown in block 305, by evaluating a signal from a lambda probe, it is recognized whether the air / fuel ratio predetermined by a desired value was actually present in the combustion chamber and was burned there. When a deviation between the target value and the detected value of the air / fuel ratio is detected, a correction signal is generated and fed to a mixture formation function. By evaluating the time profile of the correction signal, short-term deviations between the specified and the detected air / fuel ratio can be recognized.

The lambda control can only optimally control deviations regulate when the controller output is idle, i.e. it there are no control deviations, a value close to Takes neutral position. Occur permanent deviations or Malfunctions due to aging or errors in the Fuel supply system 10, so the Controller output permanent a value outside the zero position and runs outside of its optimal Workspace. Short-term deviations or malfunctions can only compensate poorly or not at all become.

The mixture adaptation function shown in block 304 solves this problem. It recognizes permanent deviations between the specified and the detected air / fuel ratio by evaluating the output signal of the lambda control and intervenes adaptively in the mixture formation.

The mass of fuel to be injected is so changed that the controller output in idle state again Takes value close to the zero position.

In a block 303, the function of the High pressure injection valves 18 checked. Because an electrical Checking the output stages of the high-pressure injection valves 18 already during normal operation of the internal combustion engine is carried out, the diagnostic cycle checks whether a There is a quantity error. There is a quantity error if one predetermined amount of fuel not in the combustion chamber amount of fuel injected into the engine matches.

To do this, use the one shown in block 304 Misfire detection and smoothness control functions Comparison of the output signals of these functions with predetermined threshold values determined whether and in which There are uneven cylinders or misfires in the cylinders. Already with this information can with high Probability of an error of High pressure injection valves 18 are closed.

In addition, an output signal of block 305 Lambda control shown evaluated. This will checks whether the output signal of the lambda control over a predetermined time larger than a predetermined one Is threshold. Alternatively or in addition to Lambda control becomes the output signal of block 306 shown mixture adaptation evaluated. The The output signal of the mixture adaptation is the same as for the Lambda control with a predetermined threshold compared.

Short-term errors, i.e. short-term errors of the High pressure injectors 18 are ANDed the results of the smooth running regulation or the Misfire detection 304 with the result of the lambda control 305 recognized. In other words, will be a mistake with the help of misfire detection or smooth running control recognized and an error is additionally identified with the help of Lambda control is detected, then an error occurs High pressure injection valves 18 closed.

Permanent failures of the high pressure injectors 18, i.e. Errors that are permanent are identified by an AND operation the results of the smooth running regulation or the Misfire detection 304 with the result of the mixture adaptation 306 recognized. In other words, will be a mistake with the help of misfire detection or smooth running control recognized and an error is additionally identified with the help of If mixture adaptation 306 is detected, then an error is caused High pressure injection valves 18 closed.

In block 307, a display device is used an error of the high pressure injection valves 18 is indicated.

If a fault in the high-pressure injection valves 18 was detected, the diagnostic cycle is ended and a corresponding one Emergency operation of the internal combustion engine is set.

If there is no fault in the high-pressure injection valves 18, then In a block 308, the pressure sensor 21 is opened Functionality checked.

In normal operation of the internal combustion engine, fuel becomes the Storage space 17 supplied. The pressure in the storage space 17 measured by the pressure sensor 21 and via the High pressure injectors 18 fuel of a combustion fed. By evaluating the output signals of the Lambda control functions 305 and / or mixture adaptation 306 can detect the behavior of the combustion of the fuel become.

To diagnose the pressure sensor 21, a predetermined Time of pressure in the storage space with the pressure sensor 21 and the combustion behavior of the fuel using the Lambda control and / or mixture adaptation detected. Subsequently the pressure in the storage space is changed. Then the Pressure and the combustion behavior of the fuel again detected. By comparing the before and the pressure change values recorded for the pressure in the after the pressure change Storage space 17 and the combustion behavior of the Fuel, is based on the function of the pressure sensor 21 closed.

In block 309, an error of the pressure sensor 21 is displayed with the aid of a display device.
If an error in the pressure sensor 21 was detected, the diagnostic cycle is ended and a corresponding emergency operation function of the internal combustion engine is activated.

There is no fault in the high pressure injection valves 18 or Pressure sensor 21 before, the function in a block 310 of the pressure control valve 19 checked. Because an electrical Check the output stages of the pressure control valve 19 already takes place during normal operation of the internal combustion engine, it is checked here whether the activation of the Pressure control valve 19 to be expected by the control unit 25 Pressure value in the storage space 17 is set.

For this purpose, the pressure control valve 19 can, for example, driving signal with the output from the pressure sensor 21 Signal can be compared. These signals give way to one longer periods of time, so it can an error in the pressure control valve 19 can be concluded.

To an error of the pressure control valve 19 with a larger To be able to recognize security are also the Output signals of the lambda control 305 and the Mixture adaptation 306 evaluated. For example, it can Pressure control valve 19 driving signal in one be changed in a predetermined manner, whereby normally the pressure in the storage space 17 and the injected fuel mass specifically changed. At the same time, the behavior of the combustion through Evaluation of the output signals of the lambda control and the Mixture adaptation detected. The pressure control valve 19th driving signal is with the output signals of the Lambda control and / or the mixture adaptation compared. Becomes the signal driving the pressure control valve 19 in quickly changed in a predetermined manner, so it will Pressure control valve 19 driving signal with the Output signal of the lambda control compared. Give way to this Signals essential over a predetermined period of time from each other, it may indicate an error of the Pressure control valve 19 are closed. Will that be Pressure control valve 19 driving signal in predetermined Slowly changed, so it becomes the pressure control valve 19 driving signal with the output signal of Mixture adaptation 306 compared. Transfer these signals a predetermined period of time substantially apart, so can indicate a fault in the pressure control valve 19 getting closed.

In a block 311, a display device is used an error of the pressure sensor 21 is displayed.

If there is no fault in the high-pressure injection valves 18, the Pressure sensor 21 or the pressure control valve 19 is in front a step 312 checks whether there is a leak in the Fuel supply system 10 is present.

For this purpose, in the wake of the internal combustion engine, i.e. the Internal combustion engine is switched off, the pressure reduction in Storage space 17 detected. The pressure builds up in one shorter than a predetermined period of time, then a Leakage of the fuel supply system 10 detected.

In a block 313, a display device is used a leakage of the fuel supply system 10 is indicated.

The order of checking the individual components of the fuel supply system 10 was only here exemplified and can be used in a suitable manner to be changed. Logically, the diagnosis of the Pressure sensor 21 always before the diagnosis of Pressure control valve 19 take place when the diagnosis of Pressure control valve 19 a functioning pressure sensor 21 presupposes.

Furthermore, in addition to being exemplary here described components other components of the Fuel supply system 10 checked in the diagnostic cycle become.

State of the art

The invention relates to a method and a device for operating a fuel supply system Internal combustion engine, in particular of a motor vehicle, at with the help of a pump fuel into a storage space , promoted and a pressure is generated in the storage space, at an actual value of the pressure with the help of a pressure sensor is measured, and at which the pressure in the storage space a setpoint is controlled and regulated, an error in the fuel supply system by a Plausibility check is recognized.

From US 5,241,933 is a Fuel supply system known in which the Fuel pressure is regulated using a pressure regulator and in which an error detection device an error in Detects fuel supply system and this error with Is displayed using a display device. This will a differential pressure from an actual pressure and a set pressure educated. The differential pressure then becomes a correction value determined with which the setpoint value of the pressure is corrected.

The correction value is additionally fed to an error detection device in which it is checked whether the correction value is within one of two predetermined values permissible pressure range formed. If the correction value is outside of this Range, an error in the fuel supply system is recognized and displayed.

From the unpublished EP 0 899 442 A2 with the designations DE and FR a fuel injection system is known, in which upon detection of an error (in step S12) is changed to a homogeneous operating state (step S 13). This Transition to the homogeneous operating state is independent of the previous one Operating condition. In the homogeneous operating state, a correction factor α (step S 14) detected and depending on the value of the correction factor α (step S15) to one Fault in the fuel pressure sensor (step S16) or the high pressure regulator (step S17) closed. The operation of the internal combustion engine also takes place after the Diagnostics in the homogeneous operating state.

The present invention has for its object a method of Generic type to improve such that the one error in Component causing fuel supply system can be determined, or that an operation of the fuel supply system despite the faulty component can continue.

The object of the present invention is achieved with the features of claim 1 solved.

Advantages of the invention

The particularly great advantage of the present invention is that it is accurate Diagnosis of the fuel supply system is achieved without additional components.

Further advantages of the invention result in connection with the subclaims the following description of exemplary embodiments.

drawing

Embodiments of the invention are shown in the drawing and explained in more detail in the following description.

Figure 1
shows a schematic representation of a fuel supply system of an internal combustion engine.
Figure 2
shows schematically the sequence of the diagnosis of the fuel supply system.
Figure 3
shows schematically the course of the diagnostic cycle upon detection of a fault in the fuel supply system.
Description of the embodiments

1 shows a fuel supply system 10 shown for use in an internal combustion engine is provided.

An electric fuel pump is in a fuel tank 11 (EKP) 12, a fuel filter 13 and a low pressure regulator 14 arranged.

The EKP 12 promotes the through the fuel filter 13 Fuel from the fuel tank 11. The fuel filter 13 has the task of foreign particles from the fuel filter out. With the help of the low pressure regulator 14 the fuel pressure in the low pressure range to one predetermined value regulated.

A fuel line 15 leads from the fuel tank 11 a high pressure pump 16. The high pressure pump 16 closes there is a storage space 17 on which injection valves 18 are arranged. The injection valves 18 are with the Storage space 17 connected and are preferably directly the Combustion chambers assigned to the internal combustion engine.

The fuel is produced using the electric fuel pump 12 from the fuel tank 11 via the fuel line 15 to High pressure pump 16 promoted. This turns the fuel on brought to a pressure of about 4-5 bar. The high pressure pump 16, which are preferably directly from the internal combustion engine is driven, compresses and delivers the fuel into a storage space 17. The fuel pressure reached here values of up to 120 bar. About the injectors 18, which can be controlled individually, the Fuel directly into the combustion chambers of the internal combustion engine injected.

A pressure sensor 21 and a pressure control valve 19 is direct connected to storage space 17. The pressure control valve 19 is connected on the input side to the storage space 17. A return line 20 leads to the output side Fuel line 15. Via signal and control lines 22, 23 are the pressure sensor 21 and the pressure control valve 19 with connected to a control unit 25.

Instead of a pressure control valve 19 can also Quantity control valve in a fuel supply system 10 come into use. For the sake of simplicity, following text only the pressure control valve 19 further described.

With the help of the pressure sensor 21, the actual value of the Detected fuel pressure in the storage space 17. About the Signal line 22 becomes the actual value to control unit 25 fed. In the control unit 25 is based on the detected A control signal is formed, with which the pressure control valve 19 via the control line 23 is controlled.

In the control unit 25 are various functions that Control of the internal combustion engine are used to implement. In modern control units have these functions on one Computer programmed and then in a memory of the Control unit 25 filed. The ones stored in memory Functions are dependent on the requirements of the Internal combustion engine activated. Here, in particular tough demands on the real-time capability of the control unit 25 in connection with the functions. in principle is, however, a pure hardware implementation of the functions to control the internal combustion engine quite possible.

To control or regulate the pressure in the storage space 17 of the fuel supply system 10 serve, for example the functions of pressure control and pressure pilot control.

The pressure control function regulates faults that affect the Change the pressure in the storage space briefly. For this, the Output signal of the pressure sensor 21 with a setpoint compared. When a discrepancy between The output signal of the pressure sensor 21 and the target variable become on Generated signal with which the pressure control valve 19 is controlled and the deviation is corrected. Normally, i.e. if there is no fault, the output of the pressure regulator remains in zero or neutral position.

The pressure pre-control generates on the basis of a target size for the pressure a control signal for the pressure control valve 19. In general, the print pre-control describes this Behavior of the fuel supply system 10 so accurate that the pressure regulator only has to compensate for malfunctions and otherwise remains in neutral.

The pressure control and the pressure pre-control work in Principle parallel, the pressure control being dynamic and the pressure pre-control the stationary behavior of the pressure in the Affect storage space.

In Figure 2 is the sequence of a diagnosis of the Fuel supply system 10 shown.

A block 201 represents the normal operation of the Internal combustion engine. Normal operation means that the Internal combustion engine runs faultlessly, no emergency functions are activated and / or the diagnostic cycle is not activated is.

During normal operation 201 of the internal combustion engine Various reviews carried out on an ongoing basis. in the Block 202 becomes an electrical check of the pressure sensor 21 performed. At the same time in block 203 general plausibility check Fuel supply system 10 performed and in block 204 are the final stages of the pressure control valve 19 and High pressure injection valves 18 checked.

The electrical check of the pressure sensor 21 is carried out by Evaluation of the output signal of the pressure sensor 21 carried out. For this purpose, it is checked, for example, whether that Output signal values within a permissible range occupies. The output signal takes values outside the permissible range, then a short circuit or a Broken cable error detected. It can also be checked whether the timing of the output signal is a dependent typical form of the fuel supply system 10.

If an error of the pressure sensor 21 is detected in block 202, then is the error in block 205 using a Display device displayed and simultaneously in block 206 a corresponding emergency operation of the internal combustion engine set. For example, when an error is detected the pressure sensor 21 in emergency operation, the pressure control switched off, so that the pressure in the storage space 17 only is set by the print pre-control.

An error in the output stages of the pressure control valve 19 or High pressure injectors 18, by observing one Output voltage of the individual output stages recognized. differs the power amplifier voltage when switched on or switched off state of the power amplifiers essentially by one for the on or off state of the Output stages predetermined value, then a short circuit or Broken cables in the output stages detected.

If an error in the output stages of the Pressure control valve 19 or the high pressure injection valves 18th the error is detected in block 207 with the aid of a Display device displayed and simultaneously in block 208 a corresponding emergency operation of the internal combustion engine set.

Is checked in block 203 by a plausibility check of the Fuel supply system 10 is a general failure is recognized, then in a block 209 using a Display device of the errors displayed and on Diagnostic cycle of the internal combustion engine started and displayed. For this purpose, different ones are created in block 210 Diagnostic functions activated to check the individual components of the fuel supply system 10 serve.

For example, a plausibility check of the Fuel supply system 10, wherein for pressure control in Storage space 17 in addition to the pressure regulator Print pre-control is carried out by the Output value of the pressure regulator with a predetermined Threshold is compared. If the exceeds Output value of the pressure regulator above a predetermined one Time period the threshold value, then a deviation of the Fuel supply system 10 of normal behavior or the print pre-control recognized. For this it is assumed that the print pre-control works properly and that stationary behavior of the fuel supply system 10 described sufficiently precisely.

FIG. 3 schematically represents the course of the diagnostic cycle represents.

In a step 301 (this step corresponds to the Step 203 in Figure 2) through the Plausibility check an error in the Fuel supply system 10 detected, so in one Step 302 of the diagnostic cycle started. Here are Diagnostic functions enabled the individual components of the fuel supply system 10 for functionality check.

For this purpose, output signals of the functions Misfire detection, smooth running control, lambda control, Mixture adaptation or leakage detection in a suitable manner evaluated and linked together.

In the following, signals are also used as output signals referred to, from an interim result of the above Functions can originate.

With the help of the misfire detection function shown in block 304, combustion misfires are detected on the basis of an air / fuel ratio that is too "rich" or "lean". Misfires in individual cylinders cause the individual cylinders to no longer deliver the same torque, which causes the internal combustion engine to run unevenly.

With the help of the smooth running control function shown in block 304, different emitted moments in the individual cylinders are recorded and compensated for by varying the injected fuel mass in the cylinders concerned.

With the aid of the lambda control function shown in block 305, by evaluating a signal from a lambda probe, it is recognized whether the air / fuel ratio predetermined by a desired value was actually present in the combustion chamber and was burned there. When a deviation between the target value and the detected value of the air / fuel ratio is detected, a correction signal is generated and fed to a mixture formation function. By evaluating the time profile of the correction signal, short-term deviations between the specified and the detected air / fuel ratio can be recognized.

The lambda control can only optimally control deviations regulate when the controller output is idle, i.e. it there are no control deviations, a value close to Takes neutral position. Occur permanent deviations or Malfunctions due to aging or errors in the Fuel supply system 10, so the Controller output permanent a value outside the zero position and runs outside of its optimal Workspace. Short-term deviations or malfunctions can only compensate poorly or not at all become.

The mixture adaptation function shown in block 304 solves this problem. It recognizes permanent deviations between the specified and the detected air / fuel ratio by evaluating the output signal of the lambda control and intervenes adaptively in the mixture formation.

The mass of fuel to be injected is so changed that the controller output in idle state again Takes value close to the zero position.

In a block 303, the function of the High pressure injection valves 18 checked. Because an electrical Checking the output stages of the high-pressure injection valves 18 already during normal operation of the internal combustion engine is carried out, the diagnostic cycle checks whether a There is a quantity error. There is a quantity error if one predetermined amount of fuel not in the combustion chamber amount of fuel injected into the engine matches.

To do this, use the one shown in block 304 Misfire detection and smoothness control functions Comparison of the output signals of these functions with predetermined threshold values determined whether and in which There are uneven cylinders or misfires in the cylinders. Already with this information can with high Probability of an error of High pressure injection valves 18 are closed.

In addition, an output signal of block 305 Lambda control shown evaluated. This will checks whether the output signal of the lambda control over a predetermined time larger than a predetermined one Is threshold. Alternatively or in addition to Lambda control becomes the output signal of block 306 shown mixture adaptation evaluated. The The output signal of the mixture adaptation is the same as for the Lambda control with a predetermined threshold compared.

Short-term errors, i.e. short-term errors of the High pressure injectors 18 are ANDed the results of the smooth running regulation or the Misfire detection 304 with the result of the lambda control 305 recognized. In other words, will be a mistake with the help of misfire detection or smooth running control recognized and an error is additionally identified with the help of Lambda control is detected, then an error occurs High pressure injection valves 18 closed.

Permanent failures of the high pressure injectors 18, i.e. Errors that are permanent are identified by an AND operation the results of the smooth running regulation or the Misfire detection 304 with the result of the mixture adaptation 306 recognized. In other words, will be a mistake with the help of misfire detection or smooth running control recognized and an error is additionally identified with the help of If mixture adaptation 306 is detected, then an error is caused High pressure injection valves 18 closed.

In block 307, a display device is used an error of the high pressure injection valves 18 is indicated.

If a fault in the high-pressure injection valves 18 was detected, the diagnostic cycle is ended and a corresponding one Emergency operation of the internal combustion engine is set.

If there is no fault in the high-pressure injection valves 18, then In a block 308, the pressure sensor 21 is opened Functionality checked.

In normal operation of the internal combustion engine, fuel becomes the Storage space 17 supplied. The pressure in the storage space 17 measured by the pressure sensor 21 and via the High pressure injectors 18 fuel of a combustion fed. By evaluating the output signals of the Lambda control functions 305 and / or mixture adaptation 306 can detect the behavior of the combustion of the fuel become.

To diagnose the pressure sensor 21, a predetermined Time of pressure in the storage space with the pressure sensor 21 and the combustion behavior of the fuel using the Lambda control and / or mixture adaptation detected. Subsequently the pressure in the storage space is changed. Then the Pressure and the combustion behavior of the fuel again detected. By comparing the before and the pressure change values recorded for the pressure in the after the pressure change Storage space 17 and the combustion behavior of the Fuel, is based on the function of the pressure sensor 21 closed.

In block 309, an error of the pressure sensor 21 is displayed with the aid of a display device.
If an error in the pressure sensor 21 has been detected, the diagnostic cycle is ended and a corresponding emergency operation function of the internal combustion engine is activated.

There is no fault in the high pressure injection valves 18 or Pressure sensor 21 before, the function in a block 310 of the pressure control valve 19 checked. Because an electrical Check the output stages of the pressure control valve 19 already takes place during normal operation of the internal combustion engine, it is checked here whether the activation of the Pressure control valve 19 to be expected by the control unit 25 Pressure value in the storage space 17 is set.

For this purpose, the pressure control valve 19 can, for example, driving signal with the output from the pressure sensor 21 Signal can be compared. These signals give way to one longer periods of time, so it can an error in the pressure control valve 19 can be concluded.

To an error of the pressure control valve 19 with a larger To be able to recognize security are also the Output signals of the lambda control 305 and the Mixture adaptation 306 evaluated. For example, it can Pressure control valve 19 driving signal in one be changed in a predetermined manner, whereby normally the pressure in the storage space 17 and the injected fuel mass specifically changed. At the same time, the behavior of the combustion through Evaluation of the output signals of the lambda control and the Mixture adaptation detected. The pressure control valve 19th driving signal is with the output signals of the Lambda control and / or the mixture adaptation compared. Becomes the signal driving the pressure control valve 19 in quickly changed in a predetermined manner, so it will Pressure control valve 19 driving signal with the Output signal of the lambda control compared. Give way to this Signals essential over a predetermined period of time from each other, it may indicate an error of the Pressure control valve 19 are closed. Will that be Pressure control valve 19 driving signal in predetermined Slowly changed, so it becomes the pressure control valve 19 driving signal with the output signal of Mixture adaptation 306 compared. Transfer these signals a predetermined period of time substantially apart, so can indicate a fault in the pressure control valve 19 getting closed.

In a block 311, a display device is used an error of the pressure sensor 21 is displayed.

If there is no fault in the high-pressure injection valves 18, the Pressure sensor 21 or the pressure control valve 19 is in front a step 312 checks whether there is a leak in the Fuel supply system 10 is present.

For this purpose, in the wake of the internal combustion engine, i.e. the Internal combustion engine is switched off, the pressure reduction in Storage space 17 detected. The pressure builds up in one shorter than a predetermined period of time, then a Leakage of the fuel supply system 10 detected.

In a block 313, a display device is used a leakage of the fuel supply system 10 is indicated.

The order of checking the individual components of the fuel supply system 10 was only here exemplified and can be used in a suitable manner to be changed. Logically, the diagnosis of the Pressure sensor 21 always before the diagnosis of Pressure control valve 19 take place when the diagnosis of Pressure control valve 19 a functioning pressure sensor 21 presupposes.

Furthermore, in addition to being exemplary here described components other components of the Fuel supply system 10 checked in the diagnostic cycle become.

Claims (9)

  1. Method for operating a fuel supply system (10) of an internal combustion engine, in particular of a motor vehicle, in which fuel is fed into a storage space (17) using a pump (12, 16), and a pressure is generated in the storage space (17), in which an actual value of pressure is measured using a pressure sensor (21), and in which the pressure in the storage space (17) is controlled or regulated to a setpoint value, a fault in the fuel supply system (10) being detected by means of a plausibility check, characterized in that, when a fault is detected in the fuel supply system (10) a diagnostic cycle of the internal combustion engine is initiated, diagnostic functions which check individual components (18, 19, 21) of the fuel supply system (10) for operational capability being activated, as a result of which the component (18, 19, 21) which causes the fault can be determined and displayed.
  2. Method according to Claim 1, characterized in that, in order to check the plausibility of the fuel supply system (10), the output signal of a function which is implemented in the control device (25) generates the signals in order to actuate the pressure control valve (18) in order to regulate the pressure in the storage space (17), is compared with a threshold value and a fault is detected in the fuel supply system (10) if the threshold value is continuously exceeded.
  3. Method according to Claim 1, characterized in that diagnostic functions which check at least one pressure sensor (21) and/or a high pressure injection valve (18) and/or a quantity control valve or pressure control valve (19) and/or a housing or seals of the fuel supply system (10) for operational capability are activated.
  4. Method according to Claim 1 or 2, characterized in that, in addition to the plausibility check, the output signal of a pressure sensor (21) and the output stages of a pressure or quantity control valve (21) are monitored, and when a fault is detected, it is displayed and a corresponding emergency operating function of the internal combustion engine is activated.
  5. Method according to at least one of the preceding claims, characterized in that, when a fault in a component of the fuel supply system (10) is detected, the diagnostic cycle is terminated and a corresponding emergency operating function of the internal combustion engine is activated.
  6. Method according to at least one of the preceding claims, characterized in that, during the diagnostic cycle, a fault in a high pressure injection valve (18) is detected and displayed by evaluating an output signal of at least one misfire detection means (304) and/or of an unsmooth running regulating means (304) and/or of a lambda regulating means (305) and/or of a mixture adaptation means (306).
  7. Method according to at least one of the preceding claims, characterized in that, during the diagnostic cycle, a fault in a pressure sensor (21) is detected and displayed by evaluating an output signal of at least one lambda regulating means (305) and/or of a mixture adaptation means (306).
  8. Method according to at least one of the preceding claims, characterized in that, during the diagnostic cycle, a fault in a pressure control or quantity control valve (19) is detected and displayed by evaluating an output signal of at least one pressure sensor (21) and/or of a lambda regulating means (305) and/or of a mixture adaptation means (306).
  9. Electric storage medium for application in a method according to Claim 1, in particular read-only memory, for a controller of an internal combustion engine, in particular of a motor vehicle, on which a program is stored, which, if it is executed on a computing device, in particular on a microprocessor, carries out all the steps from at least one of Claims 1 to 8.
EP99973747A 1999-02-26 1999-09-10 System for operating an internal combustion engine, especially an internal combustion engine of an automobile Expired - Fee Related EP1157201B1 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
DE19908352 1999-02-26
DE19908352A DE19908352A1 (en) 1999-02-26 1999-02-26 Fuel injection method for an internal combustion engine
PCT/DE1999/002958 WO2000052319A1 (en) 1999-02-26 1999-09-10 System for operating an internal combustion engine, especially an internal combustion engine of an automobile

Publications (2)

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EP1157201A1 EP1157201A1 (en) 2001-11-28
EP1157201B1 true EP1157201B1 (en) 2003-11-26

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EP (1) EP1157201B1 (en)
JP (1) JP2002538368A (en)
KR (1) KR100669293B1 (en)
DE (1) DE19908352A1 (en)
ES (1) ES2212682T3 (en)
WO (1) WO2000052319A1 (en)

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ES2212682T3 (en) 2004-07-16
US6474292B1 (en) 2002-11-05
JP2002538368A (en) 2002-11-12
EP1157201A1 (en) 2001-11-28
DE19908352A1 (en) 2000-08-31
KR100669293B1 (en) 2007-01-17
WO2000052319A1 (en) 2000-09-08

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