EP1432905A1 - Verfahren zum betreiben eines kraftstoffversorgungssystems für einen verbrennungsmotor eines kraftfahrzeugs - Google Patents
Verfahren zum betreiben eines kraftstoffversorgungssystems für einen verbrennungsmotor eines kraftfahrzeugsInfo
- Publication number
- EP1432905A1 EP1432905A1 EP02760108A EP02760108A EP1432905A1 EP 1432905 A1 EP1432905 A1 EP 1432905A1 EP 02760108 A EP02760108 A EP 02760108A EP 02760108 A EP02760108 A EP 02760108A EP 1432905 A1 EP1432905 A1 EP 1432905A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- pressure
- pressure sensor
- signal
- value
- stored
- 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
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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
- F02D41/22—Safety or indicating devices for abnormal conditions
- F02D41/222—Safety or indicating devices for abnormal conditions relating to the failure of sensors or parameter detection devices
-
- 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
- F02D41/30—Controlling fuel injection
- F02D41/38—Controlling fuel injection of the high pressure type
- F02D41/3809—Common rail control systems
-
- 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
- F02D41/30—Controlling fuel injection
- F02D41/38—Controlling fuel injection of the high pressure type
- F02D41/3809—Common rail control systems
- F02D41/3836—Controlling the fuel pressure
-
- 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
- F02D41/22—Safety or indicating devices for abnormal conditions
- F02D41/222—Safety or indicating devices for abnormal conditions relating to the failure of sensors or parameter detection devices
- F02D2041/223—Diagnosis of fuel pressure sensors
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D2200/00—Input parameters for engine control
- F02D2200/02—Input parameters for engine control the parameters being related to the engine
- F02D2200/06—Fuel or fuel supply system parameters
- F02D2200/0602—Fuel pressure
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M63/00—Other fuel-injection apparatus having pertinent characteristics not provided for in groups F02M39/00 - F02M57/00 or F02M67/00; Details, component parts, or accessories of fuel-injection apparatus, not provided for in, or of interest apart from, the apparatus of groups F02M39/00 - F02M61/00 or F02M67/00; Combination of fuel pump with other devices, e.g. lubricating oil pump
- F02M63/02—Fuel-injection apparatus having several injectors fed by a common pumping element, or having several pumping elements feeding a common injector; Fuel-injection apparatus having provisions for cutting-out pumps, pumping elements, or injectors; Fuel-injection apparatus having provisions for variably interconnecting pumping elements and injectors alternatively
- F02M63/0225—Fuel-injection apparatus having a common rail feeding several injectors ; Means for varying pressure in common rails; Pumps feeding common rails
Definitions
- the invention relates to a method for operating a fuel supply system for an internal combustion engine of a motor vehicle, with a fuel reservoir, with a fuel pump and with a pressure sensor, the fuel pump fuel from the
- Fuel tank delivers into a pressure area, the pressure sensor being arranged in the pressure area and the pressure sensor generating a signal representing the pressure in the pressure area.
- the invention further relates to a corresponding control device for an internal combustion engine, a computer program with program code means, a computer program product with program code means and a fuel supply system for an internal combustion engine of a motor vehicle.
- Generic systems are used, for example, in motor vehicles with gasoline direct injection.
- the invention can also be used in the context of a high-pressure diesel injection or in the context of low-pressure gasoline or diesel injections.
- State of the art
- Fuel injection method for an internal combustion engine the fuel being conveyed from the fuel tank into a storage space with the aid of an electric fuel pump and a downstream high-pressure pump.
- the pressure generated in the storage space is measured using a pressure sensor.
- the system is controlled and regulated to a setpoint value for the pressure in the storage space.
- An error in the fuel supply system is recognized by a plausibility check in accordance with DE 199 08 352 AI.
- a diagnostic cycle of the internal combustion engine is initiated, whereby diagnostic functions are activated that check the functionality of individual components of the fuel supply system.
- an electrical check of the high-pressure sensor is carried out by evaluating the output signals of the pressure sensor.
- Fuel supply system for an internal combustion engine of a motor vehicle with a fuel reservoir, with a fuel pump and with a pressure sensor, the fuel pump conveying fuel from the fuel reservoir into a pressure area, is further developed compared to the state in that the pressure sensor is arranged in the pressure area in that the pressure sensor generates a signal representing the pressure in the pressure area and that for a diagnosis of the pressure sensor the signal representing the pressure in the pressure area is evaluated.
- a pressure sensor in the low-pressure area of a fuel supply system is used in the method according to the invention and, if appropriate, an additional pressure sensor in the high-pressure area.
- the diagnosis of the pressure sensor based on the signal representing the pressure in the pressure range creates an inexpensive and reliable diagnostic option, since on the one hand no increased hardware expenditure is required and the diagnosis can be carried out in an engine control unit that is already present and on the other hand the signal evaluation within the engine control unit represents a particularly reliable option.
- a preferred development provides that, for diagnosis, the signals representing the pressure in the pressure area are recorded at different, predeterminable times and stored in a memory.
- the advantageous storage of signal values results in a wide range of diagnostic options, including the options for analyzing averaged signal values or analyzing pressure values that correspond to specific signal values.
- the result of the analysis of the signal values stored in the memory is advantageously a measure of the state of the pressure sensor. Storage at predeterminable times, which depend on an operating situation of the motor vehicle system and / or a driving situation of the motor vehicle, is particularly advantageous. This differentiated storage option for signal values at selected points in time results in various diagnostic options which are further elaborated within the scope of the subclaims.
- a first analysis possibility is that the detected signal values are checked to determine whether they are within a plausible signal range, which is formed by a maximum and a minimum threshold, and that an error of the pressure sensor is concluded in the event of a negative result.
- the maximum and minimum threshold values can be assigned to the respective
- the adapted threshold values can be stored, for example, in the memory of the engine control unit.
- a second advantageous analysis option provides that a difference is formed between two successive signal values, that if this difference is less than a predefinable threshold value, a counter is incremented, that if this difference is greater than the predefinable threshold value, the Counter is set to zero, and that when the counter has reached a predefinable threshold value, an error in the pressure sensor is concluded.
- a buffered signal value and the current signal value are preferably used as two temporally successive signal values. Together with the zeroing of the counter, the current signal value is buffered.
- This analysis option preferably takes place at operating points at which an unsteady pressure signal is to be expected, ie as soon as an engine speed has been detected or when injection is active.
- this analysis option means that an error in the pressure sensor is inferred if the measured pressure values change only inadequately over a certain period of time.
- a third advantageous analysis option provides that the fuel pump is controlled in accordance with a predefinable target pressure in the pressure range, that a first target pressure is specified and a first signal value is stored after a settling time, that a second target pressure is specified and a second signal value is stored after a settling time, that an absolute value of the difference between the first and second signal values is formed, and that if the absolute value is less than a threshold value dependent on the difference between the first and second signal values, an error in the pressure sensor is concluded.
- it is checked whether a change in the set pressure in the pressure area results in a corresponding change in the signal representing the pressure in the pressure area. In other words, it is checked whether the actual pressure changes in the same way as the target pressure.
- Another advantageous analysis option provides that a first signal value is stored when the motor vehicle is started, before the fuel pump is activated, that a second signal value is stored after a predeterminable time after activation of the fuel pump, and that when the absolute value of the difference is out first and second signal value is less than a threshold value dependent on a shutdown pressure and an increase in pressure, an error of the pressure sensor is concluded.
- This analysis option serves to check whether the pressure value in the pressure chamber rises as expected after the fuel pump has been started up. The check is advantageously dependent on the parking pressure and an increase in pressure. The latter is particularly important if the pressure increase behavior of the fuel system is known.
- the pressure sensor can also advantageously be analyzed in that a first signal value is stored during a coasting operation of the motor vehicle, that the fuel pump is deactivated, that a second signal value is stored after a predefinable deactivation time, and that when the amount of the difference between the first and second signal value is smaller than a predefinable threshold value, an error of the pressure sensor is concluded.
- the period of overrun of the motor vehicle is used to deactivate the fuel umpe and to check whether the signal value subsequently detected by the pressure sensor corresponds to the expectations.
- deactivation time and the further predeterminable threshold values of this analysis method as well as of the previous and subsequent analysis methods can be adapted to the respective framework conditions of the fuel supply system and for this purpose, for example, corresponding data can be stored in a memory of the engine control unit.
- Another advantageous analytical method is very similar to the previously described method.
- This analysis method is characterized in that the fuel pump is deactivated during a coasting operation of the motor vehicle, that after a predefinable deactivation time, a first signal value is stored, that the fuel pump is activated, that after a predefinable activation time, a second signal value is stored, and that when the absolute value of the difference between the first and second signal values is less than a predefinable threshold value an error of the pressure sensor is closed.
- a signal value is initially recorded when the fuel pump is deactivated and only then is a signal value when the fuel pump is activated.
- a particularly preferred analysis option which is carried out during engine control after-running after the motor vehicle has been switched off, is that after the internal combustion engine has been switched off, a first signal value is stored, that after a specifiable switch-off time, a second signal value is stored, and then when the absolute value of the Difference between the first and second signal value is smaller than a predeterminable threshold value, an error in the pressure sensor is concluded.
- This latter analysis method takes advantage of the fact that the pressure in the pressure range generally drops after the motor vehicle has been switched off or the internal combustion engine has been switched off (and the fuel pump has been deactivated as a result).
- Realizations in the form of a computer program with program code means and in the form of a computer program product are also of particular importance Program code means.
- the computer program according to the invention has program code means to carry out all steps of the method according to the invention when the program is executed on a computer, in particular a control device for an internal combustion engine of a motor vehicle.
- the invention is thus implemented by a program stored in the control device, so that this control device provided with the program represents the invention in the same way as the method, for the execution of which the program is suitable.
- the computer program product according to the invention has program code means which are stored on a computer-readable data carrier in order to carry out the method according to the invention when the program product is executed on a computer, in particular a control device for an internal combustion engine of a motor vehicle.
- the invention is implemented by a data carrier, so that the method according to the invention can be carried out when the program product or the data carrier is integrated into a control unit for an internal combustion engine, in particular a motor vehicle.
- a data carrier or as
- an electrical storage medium can be used, for example a read only memory (ROM), an EPROM or an electrical permanent memory such as a CD-ROM or a DVD.
- ROM read only memory
- EPROM EPROM
- electrical permanent memory such as a CD-ROM or a DVD.
- a fuel supply system according to the invention for an internal combustion engine of a motor vehicle has means for carrying out the method according to the invention.
- FIG. 1 shows a first diagnostic option
- FIG. 2 shows a second diagnostic option
- FIG. 3 shows a third diagnostic option
- FIG. 4 shows a fourth diagnostic option
- FIGS. 5a and 5b show a fifth diagnostic option in different configurations
- FIG. 6 shows a sixth diagnostic option
- Figure 7 shows an embodiment of a device according to the invention.
- Figure 1 shows a first diagnostic possibility of the method according to the invention.
- a pressure sensor 76 is arranged within a fuel supply system for an internal combustion engine of a motor vehicle - corresponding to FIG. 7 - between the electric fuel pump 72, which conveys the fuel from the fuel reservoir or the tank 70, and a possibly adjoining high-pressure pump 77, the pressure sensor being temporarily stored in this 75 measures the pressure.
- the pressure signal of this pressure range generated by the pressure sensor 76 is evaluated for the diagnosis of the pressure sensor 76.
- a first diagnostic possibility is to examine the pressure value or the voltage value supplied by the sensor for a plausible voltage or signal value. For this purpose, according to FIG. 1, step 10 checks whether the signal value or the voltage value is below a minimum or above a maximum threshold value.
- step 10 It is determined in step 10 that the signal value outside the Range between the minimum and maximum threshold value, a transition is made to a step 11 in which a faulty pressure sensor is decided. This transition to step 11 can optionally take place after a certain delay time, thereby preventing short-term “signal outliers” from being recognized as errors in the pressure sensor.
- step 10 it is found that the signal or voltage value of the pressure sensor 76 is within a plausible signal - or voltage range, the process moves to step 12 by deciding that the pressure sensor 76 is OK.
- the minimum threshold value, the maximum threshold value and also the possible additional delay time can be stored in a memory 74 of an engine control unit 73.
- Figure 2 shows a second diagnostic option of the method according to the invention.
- this second diagnostic option it is checked whether the signal or voltage profile of the pressure sensor 76 has a plausible profile.
- sensor values are recorded at different successive times and stored in a memory, for example the memory 74 in the control unit 75.
- the second diagnostic option described in FIG. 2 is based on the fact that there is always a certain unrest in the pressure signal during operation of the motor vehicle. If this unrest is absent and an approximately constant signal is detected instead, then the pressure sensor is most likely defective.
- the signal value or the sensor voltage is compared with previously stored values. If the amount of the difference between these two values is less than a predefinable threshold value, this indicates a possible error.
- a counter is counted up in the event that the difference value is smaller than the threshold value. If this happens a certain number of steps in a row, So if the detected sensor signal does not change significantly compared to the previously stored values, then a signal error is recognized. If, on the other hand, a sensor value is detected that has changed by more than the threshold value compared to the previous signal value, the counter is reset and an intact pressure sensor 76 is inferred.
- the diagnostic option can preferably take place at operating points at which an unsteady signal from the pressure sensor is to be expected, that is to say, for example, as soon as an engine speed has been detected or with active injection.
- a signal value of the pressure sensor 76 is temporarily stored in a first step 20.
- a step 21 it is checked whether the amount of the difference between the current sensor signal value and the previously stored sensor signal value is smaller than a predefinable threshold value. If this is not the case that the sensor signal therefore exhibits the expected unrest, then a transition is made to a step 22 in which a counter is reset. Following step 22, the method continues to step 20. If, on the other hand, it is determined in step 21 that the absolute value is less than the predeterminable threshold value, then a transition is made to a step 23 in which the counter is incremented. In step 24, which follows step 23, a query is made as to whether the counter has reached an applicable value.
- step 24 the process jumps back from step 24 to step 21. If, on the other hand, the counter has reached an applicable threshold value in step 24, then a transition is made to step 11, in which a defective pressure sensor is detected. In practical terms, reaching the counter of an applicable threshold value means that a certain period of time is determined by the amount of the Applicable threshold value can be defined, the signal value of the pressure sensor has changed insufficiently.
- Figure 3 shows a third diagnostic option of the method according to the invention.
- This third diagnostic option is based on the possibility of varying the system pressure in demand-controlled fuel supply systems by specifying a target pressure.
- a current sensor value is temporarily stored for diagnosis of the pressure sensor.
- a setpoint pressure that differs from the current pressure is then specified (which corresponds to a change in the reference variable) and a specific, applicable time is waited until the actual pressure has settled to the setpoint pressure.
- a sensor signal value is recorded again and checks whether the magnitude of the difference is greater than or equal to an applicable threshold value that is dependent on the change in the reference variable. If this is the case, the pressure sensor is OK; If no significant pressure difference is discernible, that is, if the amount of the difference is less than an applicable threshold value that depends on the change in the reference variable, then a defective pressure sensor can be concluded.
- a current pressure sensor signal value or a pressure sensor voltage is temporarily stored in a first step 30.
- the target pressure is changed and an applicable time is waited until this pressure value has settled.
- the fuel pump 72 can, for example, be controlled by the engine control unit 73 via voltage or speed control via a signal line. With this voltage or speed control, any pressure setting in the first pressure range 75 is possible within certain limits. Has changed accordingly If a new pressure value is set in step 31, this is detected by the pressure sensor 76 in step 32. The absolute value of the difference between the first and the second detected signal value is formed and this absolute value is compared with a threshold value.
- the threshold value is dependent on the difference between the first and second setpoint pressures in the first pressure range 75. If it appears in step 32 that the absolute value of the difference between the first and second signal values is less than the threshold value, a defective pressure sensor is concluded and the step is taken 11 passed. If, on the other hand, it is determined in step 32 that the aforementioned condition is not met, the process moves on to step 12, in which a conclusion is drawn that the pressure sensor is in a proper state. After step 12, the experience according to the invention begins again in step 30.
- FIG. 4 shows a fourth diagnostic option according to the invention, which is based on the pressure difference between deactivated and activated fuel pump 72.
- a fuel pressure value detected by the pressure sensor 76 is stored.
- a certain applicable time after the activation of the fuel pump 72 a pressure value in the pressure area 75 is again recorded and stored.
- the difference in amount of the previously stored two pressure values is then formed. If the absolute value of the difference between the first and second pressure values is less than a threshold value dependent on a shutdown pressure and an increase in pressure, an error in the pressure sensor 76 is concluded.
- a first signal value is stored before the fuel pump 71 is activated when the motor vehicle is started becomes.
- the fuel pump 72 is activated.
- step 42 which follows step 41, a certain applicable time is waited until the pressure in the pressure region 75 has settled to the pressure value predetermined by the activated fuel pump 72.
- step 43 the absolute value of the difference between the first signal value after step 40 and a current, second signal value is formed. This absolute value of the difference between the first and second signal values is compared with a threshold value. The applicable threshold value depends on the parking pressure and the pressure increase.
- the corresponding data for the applicable threshold value can be stored in a map of the engine control unit 73. If it is determined in step 43 that the difference between the first and second signal value is greater than the threshold value, it is determined in subsequent step 12 that the pressure sensor is OK. If the absolute value of the difference is less than or equal to the threshold value, or if the absolute value of the difference is not greater than the threshold value, a defective pressure sensor is concluded in subsequent step 11.
- FIGS. 5a and 5b A fifth diagnostic possibility according to the invention is shown in the two FIGS. 5a and 5b, which take advantage of the possibility of briefly deactivating the fuel pump 72 during a coasting operation of the motor vehicle and of using the resulting pressure difference values in the pressure range 75.
- a first signal value representing the pressure in the pressure area 75 is stored in a step 50 during a coasting operation of the motor vehicle. This first pressure measurement after step 50 thus takes place during overrun in a state in which the fuel pump 72 is activated.
- the fuel pump 72 is briefly deactivated and there is a predeterminable time the activation of the fuel pump 72 is waited so that the new resulting pressure level can be set in the pressure range 75.
- step 52 the absolute value of the difference between the first, stored signal value and the current signal value is formed. This absolute value of the difference is then compared to a predefinable threshold. If it turns out that the absolute value of the difference is greater than a predeterminable threshold value, the process moves to step 12 by concluding that the pressure sensor is intact. If, on the other hand, the absolute value of the difference is not greater than the predeterminable threshold value, then a transition is made to step 11 by deciding on a defective pressure sensor.
- the fuel pump 72 can be reactivated in order to provide the required fuel pressure in the pressure region 75 in the event of a possible restart after the overrun mode.
- FIG. 5b describes a diagnostic option according to the invention which is based on the same physical principle as FIG. 5a.
- step 53 the electric fuel pump 72 is first deactivated during a coasting operation of the motor vehicle and a predefinable deactivation time is waited for. Following this deactivation time, a first pressure value of the pressure sensor 76 is stored in step 54.
- step 55 the fuel pump 72 is reactivated and a predefinable activation time is waited for.
- the subsequent step 56 the then current pressure sensor value is detected and the absolute value of the difference between the first and second pressure sensor signal values is formed. If this absolute value of the difference is greater than a predeterminable threshold value, the process continues to step 12 in that an intact pressure sensor is inferred. If this is not the case, step 11 is followed by one defective pressure sensor is closed.
- the deactivation time used in the context of FIGS. 5a and 5b or the activation time serves to ensure that the
- Fuel pressure range 75 can set to a steady state.
- FIG. 6 shows a sixth possibility of diagnosis of the method according to the invention.
- This diagnostic option is based on a pressure measurement during the control unit run-up after the engine of the motor vehicle has been switched off.
- a signal value of the pressure sensor is stored in the control unit run-on shortly after the engine of the motor vehicle is switched off.
- a certain applicable switch-off time is waited for in step 61.
- a current signal value of the pressure sensor is recorded in step 62 and the absolute value of the difference is formed from the first and second signal values. If an absolute value of the difference between the first and second signal value is determined that is greater than an applicable threshold value, the process moves on to step 12 by concluding that an intact pressure sensor is used. If this is not the case, the process moves to step 11 in that a defective pressure sensor is concluded.
- step 11 can be followed by a corresponding display in the field of vision of the driver of the motor vehicle or other measures by concluding that a defective pressure sensor is present.
- these further measures can be, for example, an entry in a fault memory of a memory 74 of a control unit 73 or an emergency operation function of the motor vehicle or the internal combustion engine.
- threshold values described in the figures can be applied throughout. This means that the threshold values can be adapted to the respective application or to the respective motor vehicle type as desired by the manufacturer of the motor vehicle.
- threshold values desired by the manufacturer are stored in a memory 74 of the engine control unit 73. This takes place during an application at the manufacturer of the engine control unit before delivery to the motor vehicle manufacturer.
- an averaged sensor signal value for the method according to the invention instead of recording a single sensor signal value in order to further increase the accuracy and reliability of the method according to the invention.
- a corresponding pressure value can be taken from a signal value-pressure value characteristic curve in accordance with the sensor signal value determined by the pressure sensor.
- the immediate mental stress values of the pressure sensor can be used to carry out the method according to the invention. In the latter case, the applicable threshold values have to be adjusted accordingly.
- Figure 7 shows an inventive
- Fuel supply system for an internal combustion engine of a motor vehicle Starting from the fuel reservoir 70, the fuel is conveyed from a fuel pump 72 into one of the pressure areas 75 via a fuel line 71.
- the fuel pump 72 is controlled by an engine control unit 73 with a memory 74.
- This control is in the illustration of Figure 7 by a dashed line between the engine control unit 73 and the Fuel pump marked 72.
- the method according to the invention also includes uncontrolled or uncontrolled fuel pumps.
- the pressure in the pressure area 75 is determined by means of a pressure sensor 76 which is arranged in the pressure area 75.
- the data of the pressure sensor 76 or the sensor signal values of the pressure sensor 76 are transmitted to the engine control unit 73.
- This transmission is indicated by a dashed line between the pressure sensor 76 and the engine control unit 73.
- the fuel is conducted by a high-pressure pump 77 into a high-pressure area 78, which opens into a so-called common rail 80.
- the corresponding control signals are indicated from the engine control unit 73 to the high-pressure pump 77 via a dashed line.
- the pressure in the common rail 80 is detected by a high-pressure sensor 81, which transmits the measured pressure signals - also indicated by a broken line - to the engine control unit 73.
- the fuel is injected directly into the combustion chambers of the internal combustion engine (not shown in FIG. 7) via injection valves 82, so-called injectors.
- the injectors or the injection nozzles 82 are in turn controlled by the engine control unit 73. This control is indicated by a dashed line starting from the engine control unit 73 to the injectors 82.
- a means 83 influencing the pressure in the common rail 80 is also arranged on the common rail 80. In the simplest case, this is an overpressure regulator which, in the event of an excessively high pressure in the common rail 80, discharges fuel via the pressure regulator 83 into a return line 84. The fuel returns to the pressure region 75 via the return line 84 Engine control unit 73 indicated by a dashed line.
- the engine control unit 73 with the program data and characteristic diagrams stored in the memory 74, as well as applicable threshold values and other data, carries out the method previously described in the context of FIGS. 1 to 6, the pressure signal values determined by the pressure sensor 76 and those by the pressure sensor 76 representing the pressure in Signals representing pressure range 75 are evaluated in engine control unit 73. Based on these evaluated signals, it can be concluded that the pressure sensor is functioning correctly.
- the fuel system consists of a fuel pump 72 and a high-pressure pump 77 and a subsequent direct injection into the combustion chambers of an internal combustion engine.
- the method according to the invention can also be used in a device which carries out a low-pressure injection, in which case there is no high-pressure pump 77, no common rail 80 and no direct injection.
- the fuel can be injected into an intake manifold from the pressure region 75 via injection valves.
- proper operation of the pressure sensor 76 can be determined by means of the diagnosis according to the invention.
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Combined Controls Of Internal Combustion Engines (AREA)
- Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
Abstract
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE10147189A DE10147189A1 (de) | 2001-09-25 | 2001-09-25 | Verfahren zum Betreiben eines Kraftstoffversorgungssystems für einen Verbrennungsmotor eines Kraftfahrzeugs |
DE10147189 | 2001-09-25 | ||
PCT/DE2002/002784 WO2003027472A1 (de) | 2001-09-25 | 2002-07-26 | Verfahren zum betreiben eines kraftstoffversorgungssystems für einen verbrennungsmotor eines kraftfahrzeugs |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1432905A1 true EP1432905A1 (de) | 2004-06-30 |
EP1432905B1 EP1432905B1 (de) | 2007-11-14 |
Family
ID=7700189
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP02760108A Expired - Lifetime EP1432905B1 (de) | 2001-09-25 | 2002-07-26 | Verfahren zum betreiben eines kraftstoffversorgungssystems für einen verbrennungsmotor eines kraftfahrzeugs |
Country Status (5)
Country | Link |
---|---|
US (1) | US7121265B2 (de) |
EP (1) | EP1432905B1 (de) |
DE (2) | DE10147189A1 (de) |
ES (1) | ES2294158T3 (de) |
WO (1) | WO2003027472A1 (de) |
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US7121152B2 (en) | 2003-06-06 | 2006-10-17 | Cidra Corporation | Portable flow measurement apparatus having an array of sensors |
WO2005003695A1 (en) * | 2003-06-24 | 2005-01-13 | Cidra Corporation | Characterizing unsteady pressures in pipes using optical measurement devices |
US7150202B2 (en) * | 2003-07-08 | 2006-12-19 | Cidra Corporation | Method and apparatus for measuring characteristics of core-annular flow |
WO2005015135A2 (en) * | 2003-08-08 | 2005-02-17 | Cidra Corporation | Piezocable based sensor for measuring unsteady pressures inside a pipe |
US7237440B2 (en) * | 2003-10-10 | 2007-07-03 | Cidra Corporation | Flow measurement apparatus having strain-based sensors and ultrasonic sensors |
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- 2002-07-26 ES ES02760108T patent/ES2294158T3/es not_active Expired - Lifetime
- 2002-07-26 DE DE50211221T patent/DE50211221D1/de not_active Expired - Lifetime
- 2002-07-26 US US10/490,000 patent/US7121265B2/en not_active Expired - Fee Related
- 2002-07-26 WO PCT/DE2002/002784 patent/WO2003027472A1/de active IP Right Grant
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WO2003027472A1 (de) | 2003-04-03 |
ES2294158T3 (es) | 2008-04-01 |
US20050005912A1 (en) | 2005-01-13 |
DE50211221D1 (de) | 2007-12-27 |
DE10147189A1 (de) | 2003-04-24 |
US7121265B2 (en) | 2006-10-17 |
EP1432905B1 (de) | 2007-11-14 |
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