CN101871404B - Diagnostic system and method for pressure sensor in idling state - Google Patents
Diagnostic system and method for pressure sensor in idling state Download PDFInfo
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- CN101871404B CN101871404B CN 201010168483 CN201010168483A CN101871404B CN 101871404 B CN101871404 B CN 101871404B CN 201010168483 CN201010168483 CN 201010168483 CN 201010168483 A CN201010168483 A CN 201010168483A CN 101871404 B CN101871404 B CN 101871404B
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Abstract
The invention relates to a diagnostic system and a method for a pressure sensor in an idling state. The diagnostic system comprises a fuel pump module and a diagnostic control module, wherein the fuel pump module actuates a first pump and stops a second pump when an engine is in a diagnostic mode; the first pump supplies the fuel to the second pump; the second pump supplies the fuel to a fuel sprayer of the engine through a fuel rail; the diagnostic control module receives a pressure measuring signal of the pressure on the fuel rail in the diagnostic mode from the pressure sensor; and the diagnostic control module detects the error of the pressure sensor based on a comparison between the pressure measuring signal and an ordered pressure signal of the first pump.
Description
The cross reference of related application
The application requires in the U.S. Provisional Application No.61/171 of submission on April 22nd, 2009, the U.S. Provisional Application No.61/171 that on April 22nd, 556 and 2009 submitted to, 600 preference.The content of above-mentioned application is contained in this paper by reference.
Technical field
The disclosure relates to the vehicle control system for internal-combustion engine, relates in particular to diagnostic system and method for pressure transducer.
Background technique
Here it is for the purpose of disclosure background always is shown that the background that provides is described.Inventor institute in this background technique part makes the content of description, with and can otherwise not be considered to the aspect of prior art when being described in submission, both implicitly do not think with respect to prior art of the present disclosure ambiguously yet.
Spark ignition direct spray type (SIDI) system directly sprays into pressurized fuel in the cylinder of motor.On the contrary, the port fuel injection system sprays into fuel intake manifold or the suction port of the intake valve upstream of cylinder.The SIDI system can obtain the burning of layered fuel charge during operation, to improve fuel efficiency and to reduce discharging.The layered fuel charge allows lean combustion and improves power stage.
The SIDI motor can be configured with low-pressure fuel pump and high pressure fuel pump, is used for supercharging low pressure fuel line and sparger fuel rail respectively.Pressure transducer can be connected to the sparger fuel rail, and produces the fuel rail pressure signal.Engine control system can be delivered to based on the fuel rail pressure SC sigmal control fuel quantity of cylinder.
Summary of the invention
In one embodiment, provide a kind of diagnostic system, it comprises fuel pump module, and this module activates the first pump during in diagnostic mode at power operation, and second pump of stopping using.Described the first pump is to described the second pump feed fuels, and described the second pump is by the fuel injector feed fuels of fuel rail to described motor.DCM diagnostic control module receives the measured pressure signal of the pressure of described fuel rail during the indication diagnosis pattern from pressure transducer.Described DCM diagnostic control module is based on the fault that relatively detects described pressure transducer between the command pressure signal of described measured pressure signal and described the first pump.
In further feature, provide a kind of diagnostic method of diagnostic pressure sensor.Described method comprises when power operation during in diagnostic mode, activates the first pump and second pump of stopping using.By described the first pump to described the second pump feed fuels.By described the second pump and use fuel rail to the fuel injector feed fuels of described motor.Receive the measured pressure signal of the pressure of described fuel rail during the described diagnostic mode of indication from pressure transducer.Based on the fault that relatively detects described pressure transducer between the command pressure signal of described measured pressure signal and described the first pump.
Therefore, the invention provides following technological scheme:
1. 1 kinds of diagnostic systems of scheme comprise: fuel pump module, it activates the first pump and second pump of stopping using during in diagnostic mode at power operation, wherein said the first pump is to described the second pump feed fuels, and described the second pump is by the fuel injector feed fuels of fuel rail to described motor; And DCM diagnostic control module, it receives the measured pressure signal of the pressure of described fuel rail during the indication diagnosis pattern from pressure transducer, wherein said DCM diagnostic control module is based on the fault that relatively detects described pressure transducer between the command pressure signal of described measured pressure signal and described the first pump.
Scheme 2. diagnostic system as described in scheme 1, wherein said command pressure signal is the peak rate of flow of described the first pump.
Scheme 3. diagnostic system as described in scheme 1, wherein said fuel pump module is controlled the actuating of described the first pump and described the second pump, and described the first pump is with the pressure feed fuel lower than described the second pump.
Scheme 4. diagnostic system as described in scheme 1 also comprises initialization module, this initialization module produces initializing signal during in the idling mode predetermined period at described power operation, wherein said DCM diagnostic control module can be activated to detect described fault based on described initializing signal.
Scheme 5. diagnostic system as described in scheme 1 also comprises fuel control module, this fuel control module produces described command pressure signal during in described diagnostic mode at described power operation, wherein said fuel control module sends a signal to described fuel pump module, with described the second petrolift of stopping using.
Scheme 6. diagnostic system as described in scheme 1 also comprises: the interval between diagnosis timer, initial time mark and the very first time between the current time mark of the diagnostic event of the described pressure transducer of its measurement are poor, and wherein said interval between diagnosis timer is based on the poor interval between diagnosis clocking value that increases of the described very first time; And stable period timer, it measures the initial time mark and the second time difference between the current time mark of the stable event of described motor, wherein said stable period, timer was based on described the second time difference increase clocking value stable period.
Scheme 8. diagnostic system as described in scheme 7, wherein said DCM diagnostic control module calculate described measured pressure signal and the described command pressure signal that produces during the described predetermined diagnosis cycle between a plurality of pressure differences, wherein said DCM diagnostic control module produces the middle pressure of described a plurality of pressure differences, and wherein when described middle pressure be less than the first predetermined migration with when at least a among greater than the second predetermined migration, described fault detected.
Scheme 9. diagnostic system as described in scheme 7, wherein said fuel pump module increases to second level with the delivery pressure of described the first pump from the first level based on described command pressure signal, and greater than described predetermined diagnosis during the cycle, described fuel pump module is reduced to described the first level with the described delivery pressure of described the first pump from described the second level when described interval between diagnosis clocking value.
The method of 11. 1 kinds of diagnostic pressure sensors of scheme comprises: during in diagnostic mode, activate the first pump and second pump of stopping using when power operation; By described the first pump to described the second pump feed fuels; By described the second pump and use fuel rail to the fuel injector feed fuels of described motor; Receive the measured pressure signal of the pressure of described fuel rail during the described diagnostic mode of indication from pressure transducer; And based on the fault that relatively detects described pressure transducer between the command pressure signal of described measured pressure signal and described the first pump.
Scheme 12. method as described in scheme 11, wherein said command pressure signal produces with the peak rate of flow of described the first pump.
Scheme 13. method as described in scheme 11, wherein said the first pump is with the pressure feed fuel lower than described the second pump.
Scheme 15. method as described in scheme 11 wherein produces described command pressure signal during in described diagnostic mode when described power operation.
Scheme 17. method as described in scheme 16 also comprises: based on as described in the pressure of fuel rail produce as described in measured pressure signal; When described stable period, clocking value was greater than predetermined stable period, detect described measured pressure signal; And when described interval between diagnosis clocking value greater than predetermined diagnosis during the cycle, prevent and detect described measured pressure signal.
Can know the other side of disclosure applicability from detailed description provided below.Should be appreciated that it is described in detail and instantiation is only the purpose of explanation, rather than restriction the scope of the present disclosure.
Description of drawings
Can understand more all sidedly the disclosure from its detailed description and the accompanying drawings, wherein:
Fig. 1 is the functional block diagram according to disclosure embodiment's engine system;
Fig. 2 is the functional block diagram according to disclosure embodiment's fuel injection system;
Fig. 3 is the functional block diagram of the fuel injection system of Fig. 2, shows the pressure transducer diagnostic system according to disclosure embodiment;
Fig. 4 A and 4B show the method according to disclosure embodiment's diagnostic pressure sensor; And
Fig. 5 is the exemplary graph according to Fig. 3 embodiment's fuel pressure signal.
Embodiment
In fact, following description is only exemplary, and is never restriction the present invention and application or use.For clarity sake, represent similar element with identical reference character in accompanying drawing.As used herein, phrase one of " in A, B and C at least " will be understood that it is to mean the logic (A or B or C) of using the nonexcludability logical "or".Should be appreciated that in the situation that do not change disclosure principle, the step in order manner of execution that can be different.
As used herein, term " module " refers to application-specific IC (ASIC), electronic circuit, carries out the processor (share, special use or group) of one or more softwares or firmware program and storage (shared, special use or group), combinational logic circuit and/or other suitable components of described function is provided.
In addition, motor is described although the following examples relate generally to SIDI, and embodiment of the present disclosure also can be applicable to the motor of other type.For example, the present invention can be applicable to the auxiliary compression ignition engine of compression-ignited, spark-ignition type, spark ignition direct spray type, homogeneous spark-ignition type, homogeneous-charge compression-ignition formula, layering spark-ignition type, diesel engine and spark.
Motor can comprise Fuel Control System and emission control systems, carries with the fuel of regulating engine cylinder.Fuel Control System and emission control systems can be supplied with pressure and/or supply to the fuel quantity of motor based on the pressure signal fuel metering of fuel pressure sensor.Fuel pressure sensor produces pressure signal based on the fuel pressure in the motor fuel rail.When the fuel pressure sensor fault, pressure signal may be indicated incorrect force value.The fuel pressure sensor of fault can cause the error in Fuel Control System and emission control systems.
Due to the fault of fuel pressure sensor, diagnostic trouble code (DTC) (DTC) may lose efficacy.When there is fault in fuel pressure sensor and the diagnostic system of Fuel Control System can't provide DTC the time, fault (NTF) situation can appear not finding.Fault is got rid of the NTF situation and is expended time in very much.Embodiment of the present disclosure provides the technology of diagnosis fuel pressure sensor during idling mode.Idling mode refers to that vehicles failed moves and the power operation of driver pedal when not being employed.This technology can be improved air/fuel and emission control, and reduces the quantity of NTF situation.
With reference now to Fig. 1,, show the exemplary engine control system 10 of vehicle.Engine control system 10 comprises motor 12 and fuel injection system 14.Fuel injection system 14 comprises the engine control module 16 with diagnostic system 18.Diagnostic system 18 can comprise pressure transducer diagnostic module 19.Pressure transducer diagnostic module 19 can be when motor 12 operates in idling mode the fault of detected pressures sensor 20.Pressure transducer diagnostic module 19 can determine that also pressure transducer is from the systematic offset of nominal value or actual value.Pressure transducer 20 can be sent to diagnostic system 18 with the pressure signal FRP that measures.Diagnostic system 18 can be determined the fault of pressure transducer 20.The example of engine control module 16 and diagnostic system 18 has been shown in Fig. 2 and 3.
Motor 12 comprises intake manifold 22, has fuel rail 24,26 fuel injection system 14, transmission device 28, cylinder 30 and piston 32.Exemplary engine 12 comprises eight cylinders 30 in the adjacent cylinders group 34,36 that is configured in the V-type layout.Although Fig. 1 shows eight cylinders, motor 12 can comprise the cylinder 30 of any amount.Motor 12 also can have the in-line arrangement cylinder configuration.
During power operation, air sucks intake manifold 22 by the air inlet vacuum that motor 12 aspirating strokes produce.Fuel is by in fuel injection system 14 DCI direct cylinder injections 30.Air and fuel mix in cylinder 30, and light this air/fuel mixture from the heat of compression and/or electric energy.Piston 32 in cylinder 30 drives the bent axle 38 of motor 12 to produce driving torque.The air/fuel mixture that cylinder 30 internal combustions are crossed is discharged by gas exhaust piping 40.
In Fig. 2, show fuel injection system 14.Fuel injection system 14 comprises engine control module 16, diagnostic system 18 and is used for the pressure transducer diagnostic module 19 of pressure transducer 20.Pressure transducer 20 can produce the pressure signal FRP of measurement with the fuel pressure of indication high-pressure fuel line 102.Low pressure fuel line 100 and high-pressure fuel line 102 are connected to fuel rail 24,26 and fuel injector 104,105.Low pressure fuel line 100 can comprise fuel-supplying pressure sensor 21.Fuel-supplying pressure sensor 21 can produce fuel-supplying pressure signal FFP and supply with pressure with the intended fuel of indication low-voltage fuel conduit 100.Fuel conduit 100,102 is by a corresponding reception fuel in low-pressure fuel pump 102 and high pressure fuel pump 108.When high pressure fuel pump 108 was not worked because of the diagnosis of pressure transducer 20, fuel-supplying pressure signal FFP and measured pressure signal FRP can be identical.
The low-pressure fuel pump 106 that is arranged in fuel tank 107 turns round take power supply (for example battery) as power.High pressure fuel pump 108 can turn round for power by motor 12.High pressure fuel pump 108 the higher fuel pressure of the fuel pressure that provides than low-pressure fuel pump 106 is provided and/or the fuel pressure that is provided by low-pressure fuel pump 106 is provided.Low-pressure fuel pump 106 can provide for example 400 kPas of (kPa=10
3Pa)+/-fuel pressure of 50kPa.High pressure fuel pump 108 can provide for example 15 MPa (mPa=10
6Pa)+/-fuel pressure of 1mPa.
In use, engine control module 16 produces low-voltage control signal LowP, by low-pressure fuel pump 106, fuel is pumped to low pressure fuel line 100 from fuel tank 107.Engine control module 16 produces high voltage control signal HighP, petrolift is sent to high-pressure fuel line 102 and fuel rail 24,26.High pressure fuel pump 108 is used for increasing the pressure from the fuel of low pressure fuel line 100 receptions.Fuel under high pressure is provided for high-pressure fuel line 102 and fuel rail 24,26.Fuel under high pressure sprays into cylinder 30 by fuel injector 104,105.Fuel injector 104,105 timing are controlled by engine control module 16.Although show the fuel injector of fuel rail and each fuel rail of specific quantity, can comprise fuel rail and the corresponding fuel injector of any amount.
Fuel is stored in fuel tank 107.Engine control module 16 can send low-voltage control signal LowPg to low-pressure fuel pump 106.Low-pressure fuel pump 106 is passed through low pressure fuel line 100 from fuel tank 107 pump fuel.Engine control module 16 can send high voltage control signal HighP to fuel under high pressure pump 108.High pressure fuel pump 108 pressurized fuels, so as by be connected to fuel rail 24,26 high-pressure fuel line 102 is delivered to fuel injector 104,105.
Also with reference to figure 3, illustrate the fuel injection system 14 with engine control module 16 now, show the diagnostic system 18 for pressure transducer 20.Diagnostic system 18 can comprise pressure transducer diagnostic module 19.Pressure transducer diagnostic module 19 can comprise initialization module 200, DCM diagnostic control module 202, fuel control module 203, fuel pump module 204 and Pressure testing module 206.
DCM diagnostic control module 202 receives initializing signal, and starting fluid control module 203.Fuel control module 203 sends a signal to fuel pump module 204, to pass through HWIO equipment 210 operate actuator 214.Actuator 214 can comprise low-pressure fuel pump 106 and high pressure fuel pump 108.Fuel control module 203 produces the command pressure signal CFP that is used for low-pressure fuel pump 106, to apply predetermined fuel-supplying pressure to low pressure fuel line 100.Fuel control module 203 sends command pressure signal CFP to DCM diagnostic control module 202 and fuel pump module 204.
HWIO equipment 210 can comprise interface control module 232 and hardware interface/driver 234.Interface control module 232 provide module 200,202,204,206 and hardware interface/driver 234 between interface.Hardware interface/driver 234 control examples such as petrolift 106,108 and the operation of other engine system devices.Other engine system devices can comprise ignition wire coil, spark plug, closure, solenoid valve etc.Hardware interface/driver 234 is gone back sensor-lodging, and this signal is sent to control module separately.Sensor signal can comprise the measured pressure signal FRP of pressure transducer 20 and the signal OS of other sensor 212.
Also with reference to figure 4, show the method for diagnostic pressure sensor 20 now.Describe although following step relates generally to the embodiment of Fig. 1-3, can revise these steps to be applied to other embodiments of the invention.
Described method can start from step 400.In step 402, can receive and/or produce the signal of sensor 208 and the value in storage 228.Described signal can comprise the measured pressure signal FRP of pressure transducer 20.Described signal can be sent to each module by HWIO equipment 210, for example initialization module 200, DCM diagnostic control module 202, fuel pump module 204 and Pressure testing module 206.
In step 404, when motor 12 had operated in one section predetermined period of idling mode, initialization module 200 produced initializing signal and sends it to DCM diagnostic control module 202.Otherwise control can be back to step 402.In step 406, DCM diagnostic control module 202 starts the fuel control module 203 of diagnostic system 18.In step 408, fuel control module 203 produces the command pressure signal CFP that is used for low pressure pump, and it equals the peak rate of flow of low pressure pump or in the prespecified range of its peak rate of flow.This fuel that has prevented system is supplied with error.
Also with reference to figure 5, show the exemplary graph according to Fig. 3 embodiment's fuel pressure signal now.The FRP of measured pressure signal shown in Fig. 5 is the example pressure signal of non-fault pressure transducer or pressure transducer 20 example when operating in non-fault state.Measured pressure signal FRPHigh, FRPLow are the example of fault pressure signal of fault pressure transducer and/or pressure transducer 20 example when operating in fault state.During the conventional idling mode of the motor 12 when example or pressure transducer 20 are in non-fault state, command pressure signal CFP (for example can equal the first pressure P 1,0.3mPa), measured pressure signal FRP can equal the 4th pressure P 4 (for example, 2mPa).
In step 410, fuel control module 203 sends command pressure signal CFP to DCM diagnostic control module 202 and fuel pump module 204.In step 412, fuel pump module 204 instruction low-pressure fuel pump 106 increase to predetermined supply pressure (for example, 500kPa) with the fuel pressure in low pressure fuel line 100.Described predetermined supply pressure can be demarcated and is stored in storage 228.For example, fuel pump module 204 instruction low-pressure fuel pump 106 (for example, 0.3mPa) increase to the 3rd pressure P 3 (for example, 0.5mPa) with command pressure signal CFP from the first pressure P 1.In step 414, fuel control module 203 sends a signal to fuel pump module 204, with the high pressure fuel pump 108 of stopping using, so that diagnostic pressure sensor 20.
In step 416, DCM diagnostic control module 202 activates the time of timer 216 wait prearranging quatitys stable period, with the fuel pressure in stabilizing low voltage fuel conduit 100, high-pressure fuel line 102 and fuel rail 24,26.For example, stable period timer 216 by HWIO equipment 210 access system clocks 220, the initial time mark when increasing command pressure signal CFP to receive.Stable period, timer 216 was based on from the CLK clock of system clock 220 receptions, initial time mark and current time mark being made comparisons.Time difference between stable period timer 216 time-based marks increases clocking value 218 stable period.
In step 418, when stable period clocking value 218 greater than predetermined stable period during StbzTime, control can proceed to step 420.Otherwise control can be back to step 416.Stable period clocking value 218 with predetermined stable period StbzTime make comparisons.For example, in Fig. 5, some A refers to the elapsed time of when by fuel pump module 204 increase command pressure signal CFP stable period of StbzTime.Point B refers to the concluding time of StbzTime stable period.Predetermined stable period of StbzTime from point A to point B represents to make the time length that the fuel pressure in low pressure fuel line 100, high-pressure fuel line 102 and fuel rail 24,26 can be stable.
In step 420, after predetermined stable period StbzTime, stable period timer 216 with stable period clocking value 218 reset to zero.In step 422, the counter 226 of interval between diagnosis timer 222 will guide mark X to be made as zero.X is that wherein K represents to be stored in the number of the pressure difference Δ P (X) in force value table 230 from zero integer to K.DCM diagnostic control module 202 calculates and stores the pressure difference Δ P (X) between command pressure signal CFP and measured pressure signal FRP.Measured pressure signal FRP represents non-fault pressure signal, and due to not working of high pressure fuel pump 108, it is equal to or less than command pressure signal CFP.Measured pressure signal FRP can be in the prespecified range of command pressure signal CFP.
Pressure difference Δ P (X) can calculate during predetermined diagnosis cycle DiagTime.Point B also refers to the elapsed time of predetermined diagnosis cycle DiagTime.Point C refers to the concluding time of predetermined diagnosis cycle DiagTime.Between an A and some B, due to not working of high pressure fuel pump 108, measured pressure signal FRP can (for example, 2mPa) be reduced to the second pressure P 2 (for example, 0.4mPa) from the 4th pressure P 4.Skew Ofs between P3 and P2 by pass high pressure fuel pump 108 and low, high-pressure fuel line 100,102 fuel flow friction or restriction cause.
In step 424, Pressure testing module 206 receives the fuel rail pressure signal by HWIO equipment 210 from pressure transducer 20, to produce measured pressure signal FRP.Measured pressure signal FRP can be one of fault pressure signal FRPHigh, FRPLow.In step 426, the counter 226 of interval between diagnosis timer 222 will guide mark X to add one.In step 428, Pressure testing module 206 sends measured pressure signal FRP to DCM diagnostic control module 202.Pressure difference Δ P (X) between DCM diagnostic control module 202 computations pressure signal CFP and measured pressure signal FRP.DCM diagnostic control module 202 can be determined pressure difference Δ P (X) by deducting measured pressure signal FRP from command pressure signal CFP.Pressure difference Δ P (X) can be stored in the force value table 230 of storage 228.During predetermined diagnosis cycle DiagTime, force value table 230 is upgraded by DCM diagnostic control module 202.
In step 430, DCM diagnostic control module 202 activates interval between diagnosis timer 222.Interval between diagnosis timer 222 is by HWIO equipment 210 access system clocks 220, to receive for example initial time mark when command pressure signal CFP increases.Interval between diagnosis timer 222 is made comparisons initial time mark and current time mark based on the CLK clock that receives from system clock 220.Time difference between interval between diagnosis timer 222 time-based marks increases interval between diagnosis clocking value 224.
In step 432, during greater than predetermined diagnosis cycle DiagTime, control can proceed to step 434 when interval between diagnosis clocking value 224.Otherwise control can be back to step 424.In step 434, after predetermined diagnosis cycle DiagTime, interval between diagnosis timer 222 resets to zero with interval between diagnosis clocking value 224.In step 436, DCM diagnostic control module 202 access force value tables 230 are to produce the middle pressure AVG Δ P of the pressure difference Δ P (X) that stores during predetermined diagnosis cycle DiagTime.The middle pressure AVG Δ P of the DCM diagnostic control module 202 poor Δ P of calculating pressure (X).Only as an example, middle pressure AVG Δ P can determine based on the summation of pressure difference.For example, middle pressure AVG Δ P can be determined by representation 1:
X indicates certain pressure difference, and Δ P (X) is pressure difference.
In step 438, when middle pressure AVG Δ P was offset NegErr less than predetermined negative, control can proceed to step 440.Otherwise control can proceed to step 442.For example, as shown in Figure 5, the first middle pressure can be the mean value of the pressure difference Δ P (X) between command pressure signal CFP and the first measured pressure signal FRPHigh.Pressure difference can be determined by deducting the first measured pressure signal FRPHigh from command pressure signal CFP.
Because the first measured pressure signal FRPHigh is greater than command pressure signal CFP, the first middle pressure is negative.When the first middle pressure was offset NegErr less than predetermined negative, DTC can be set as the fault of indicated pressure sensor 20.In step 440, DCM diagnostic control module 202 can produce DTC FaultH.The measured pressure signal that DTC FaultH indicated pressure sensor 20 is just producing greater than nominal value or actual value.The absolute value of predetermined negative skew NegErr is also greater than deviant Ofs.
In step 442, greater than predetermined when just being offset PosErr, control can proceed to step 444 as middle pressure AVG Δ P.Otherwise control can proceed to step 446.For example, as shown in Figure 5, the second middle pressure can be the mean value of the pressure difference Δ P (X) between command pressure signal CFP and the second measured pressure signal FRPLow.Pressure difference can be determined by deducting the second measured pressure signal FRPLow from command pressure signal CFP.
Because the second measured pressure signal FRPLow is less than command pressure signal CFP, the second middle pressure is positive number.Greater than predetermined when just being offset PosErr, DTC can be set as the fault of indicated pressure sensor 20 when the second middle pressure.In step 444, DCM diagnostic control module 202 can produce DTC FaultL.The measured pressure signal that DTC FaultL indicated pressure sensor 20 is just producing less than nominal value or actual value.The absolute value of predetermined negative skew PosErr is also greater than deviant Ofs.
The first and second measured pressure signal FRPHigh, FRPLow are the example of fault pressure signal of fault pressure transducer and/or the example that pressure transducer 20 operates in fault state.Measured pressure signal FRP can be one of two fault pressure signal FRPHigh, FRPLow.When measured pressure signal FRP is the first measured pressure signal FRPHigh, applying step 438.When measured pressure signal FRP is the second measured pressure signal FRPLow, applying step 442.
In step 446, fuel pump module 204 activates high pressure fuel pump 108 again.For example, after a C activated again, measured pressure signal FRP can (for example, 0.4mPa) increase to the 4th pressure P 4 (for example, 2mPa) from the second pressure P 2 at high pressure fuel pump 108.In step 448, fuel pump module 204 instruction low-pressure fuel pump 106 are reduced to predetermined supply pressure (for example, 300kPa) with the fuel pressure in low pressure fuel line 100.For example, at a C, fuel pump module 204 instruction low-pressure fuel pump 106 reduce command pressure signal CFP.Command pressure signal CFP can (for example, 0.5mPa) be reduced to the first pressure P 1 (for example, 0.3mPa) from the 3rd pressure P 3.Control can end at step 450.
Above-mentioned step means and is illustrative example; According to application, these steps can be sequentially, synchronously, side by side, continuously, be performed during overlapping period or with different orders.
The present invention instructs widely and can carry out in a variety of forms.Therefore, although the disclosure has comprised particular instance, due to the research of passing through accompanying drawing, specification and claims, other modification is also apparent for those of skill in the art, so true scope of the present invention should not limit like this.
Claims (20)
1. diagnostic system comprises:
Fuel pump module, it activates the first pump and second pump of stopping using during in diagnostic mode at power operation,
Wherein said the first pump is to described the second pump feed fuels, and described the second pump is by the fuel injector feed fuels of fuel rail to described motor; And
DCM diagnostic control module, it receives the measured pressure signal of the pressure of described fuel rail during the indication diagnosis pattern from pressure transducer,
Wherein said DCM diagnostic control module is based on the fault that relatively detects described pressure transducer between the command pressure signal of described measured pressure signal and described the first pump.
2. diagnostic system as claimed in claim 1, wherein said command pressure signal is the peak rate of flow of described the first pump.
3. diagnostic system as claimed in claim 1, wherein said fuel pump module is controlled the actuating of described the first pump and described the second pump, and
Wherein said the first pump is with the pressure feed fuel lower than described the second pump.
4. diagnostic system as claimed in claim 1, also comprise initialization module, and this initialization module produces initializing signal during in the idling mode predetermined period at described power operation,
Wherein said DCM diagnostic control module can be activated to detect described fault based on described initializing signal.
5. diagnostic system as claimed in claim 1, also comprise fuel control module, and this fuel control module produces described command pressure signal during in described diagnostic mode at described power operation,
Wherein said fuel control module sends a signal to described fuel pump module, with described the second pump of stopping using.
6. diagnostic system as claimed in claim 1 also comprises:
The interval between diagnosis timer, initial time mark and the very first time between the current time mark of the diagnostic event of the described pressure transducer of its measurement are poor,
Wherein said interval between diagnosis timer is based on the poor interval between diagnosis clocking value that increases of the described very first time; And
Stable period timer, it measures the initial time mark of stable event of described motor and the second time difference between the current time mark,
Wherein said stable period, timer increased clocking value stable period based on described the second time difference.
7. diagnostic system as claimed in claim 6, also comprise the Pressure testing module, and this Pressure testing module produces described measured pressure signal based on the pressure of described fuel rail,
Wherein when described stable period, clocking value was greater than predetermined stable period, start described Pressure testing module, and
Wherein when described interval between diagnosis clocking value greater than predetermined diagnosis during the cycle, described Pressure testing module is prevented and is detected described measured pressure signal.
8. diagnostic system as claimed in claim 7, wherein said DCM diagnostic control module calculate described measured pressure signal and the described command pressure signal that produces during the described predetermined diagnosis cycle between a plurality of pressure differences,
Wherein said DCM diagnostic control module produces the middle pressure of described a plurality of pressure differences, and
Wherein when described middle pressure be less than the first predetermined migration with when at least a among greater than the second predetermined migration, described fault detected.
9. diagnostic system as claimed in claim 7, wherein said fuel pump module increases to second level with the delivery pressure of described the first pump from the first level based on described command pressure signal, and
Wherein when described interval between diagnosis clocking value greater than described predetermined diagnosis during the cycle, described fuel pump module is reduced to described the first level with the described delivery pressure of described the first pump from described the second level.
10. diagnostic system as claimed in claim 7, wherein when described interval between diagnosis clocking value greater than described predetermined diagnosis during the cycle, described fuel pump module activates described the second pump.
11. the method for a diagnostic pressure sensor comprises:
During in diagnostic mode, activate the first pump and second pump of stopping using when power operation;
By described the first pump to described the second pump feed fuels;
By described the second pump and use fuel rail to the fuel injector feed fuels of described motor;
Receive the measured pressure signal of the pressure of described fuel rail during the described diagnostic mode of indication from pressure transducer; And
Based on the fault that relatively detects described pressure transducer between the command pressure signal of described measured pressure signal and described the first pump.
12. method as claimed in claim 11, wherein said command pressure signal produces with the peak rate of flow of described the first pump.
13. method as claimed in claim 11, wherein said the first pump is with the pressure feed fuel lower than described the second pump.
14. method as claimed in claim 11 also comprises:
Produce initializing signal during in the idling mode predetermined period when described power operation; And
Detect described fault based on described initializing signal.
15. method as claimed in claim 11 wherein produces described command pressure signal during in described diagnostic mode when described power operation.
16. method as claimed in claim 11 also comprises:
Initial time mark and very first time between the current time mark of diagnostic event of measuring described pressure transducer is poor;
Based on the poor interval between diagnosis clocking value that increases of the described very first time;
Measure the initial time mark of stable event of described motor and the second time difference between the current time mark; And
Based on described the second time difference increase clocking value stable period.
17. method as claimed in claim 16 also comprises:
Pressure based on described fuel rail produces described measured pressure signal;
When described stable period, clocking value was greater than predetermined stable period, detect described measured pressure signal; And
When described interval between diagnosis clocking value, is prevented and detected described measured pressure signal during the cycle greater than predetermined diagnosis.
18. method as claimed in claim 17 also comprises:
A plurality of pressure differences between the described command pressure signal that calculates described measured pressure signal and produce during the described predetermined diagnosis cycle;
Produce the middle pressure of described a plurality of pressure differences; And
When described middle pressure is less than the first predetermined migration with when at least a among greater than the second predetermined migration, described fault detected.
19. method as claimed in claim 17 also comprises:
Based on described command pressure signal, the delivery pressure of described the first pump is increased to the second level from the first level; And
Greater than described predetermined diagnosis during the cycle, the described delivery pressure of described the first pump is reduced to described the first level from described the second level when described interval between diagnosis clocking value.
20. method as claimed in claim 17 also comprises during the cycle, activating described the second pump greater than described predetermined diagnosis when described interval between diagnosis clocking value.
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US17155609P | 2009-04-22 | 2009-04-22 | |
| US61/171556 | 2009-04-22 | ||
| US12/509653 | 2009-07-27 | ||
| US12/509,653 US8091531B2 (en) | 2009-04-22 | 2009-07-27 | Diagnostic systems and methods for a pressure sensor during idle conditions |
Publications (2)
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| US9506417B2 (en) * | 2014-04-17 | 2016-11-29 | Ford Global Technologies, Llc | Methods for detecting high pressure pump bore wear |
| KR102586912B1 (en) * | 2018-03-22 | 2023-10-10 | 현대자동차주식회사 | Method and apparatus for preventing engine stall |
| CN110346147B (en) * | 2019-06-21 | 2021-07-23 | 河南美力达汽车有限公司 | Automobile engine idle speed detection control system |
| CN114441093A (en) * | 2021-12-31 | 2022-05-06 | 浙江天信仪表科技有限公司 | Fault diagnosis method, device and equipment for pressure transmitter of water supply equipment |
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| US5983714A (en) * | 1997-08-22 | 1999-11-16 | Honda Giken Kogyo Kabushiki Kaisha | System for detecting failure of fuel pressure sensor |
| US6024064A (en) * | 1996-08-09 | 2000-02-15 | Denso Corporation | High pressure fuel injection system for internal combustion engine |
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| JP3790998B2 (en) * | 1996-09-03 | 2006-06-28 | 株式会社デンソー | Accumulated fuel supply system for engines |
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| US5983714A (en) * | 1997-08-22 | 1999-11-16 | Honda Giken Kogyo Kabushiki Kaisha | System for detecting failure of fuel pressure sensor |
| US6076504A (en) * | 1998-03-02 | 2000-06-20 | Cummins Engine Company, Inc. | Apparatus for diagnosing failures and fault conditions in a fuel system of an internal combustion engine |
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