CN1184889A - Sensor failure diagnosis method in fuel injection system and sensor failure diagnosis apparatus in fuel injection system - Google Patents

Sensor failure diagnosis method in fuel injection system and sensor failure diagnosis apparatus in fuel injection system Download PDF

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Publication number
CN1184889A
CN1184889A CN97125460A CN97125460A CN1184889A CN 1184889 A CN1184889 A CN 1184889A CN 97125460 A CN97125460 A CN 97125460A CN 97125460 A CN97125460 A CN 97125460A CN 1184889 A CN1184889 A CN 1184889A
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motor
sensor
situation
revolution
surpassed
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CN1085783C (en
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堀江敏幸
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Bosch Corp
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Zexel Corp
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    • 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
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02BINTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B77/00Component parts, details or accessories, not otherwise provided for
    • F02B77/08Safety, indicating, or supervising devices
    • 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

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
  • Combined Controls Of Internal Combustion Engines (AREA)
  • Testing Of Engines (AREA)
  • Testing And Monitoring For Control Systems (AREA)
  • Fuel-Injection Apparatus (AREA)

Abstract

The failure condition of a turn sensor is determined by a first diagnosing operation (step 200) for determining whether or not various elements such as an engine speed satisfy prescribed conditions or by a second diagnosing operation (step 400) and, in any of the diagnosing operations, if the prescribed conditions are satisfied, the failure of the turn sensor is determined (step 500) and spray-up preventing control for forcibly making a fuel injection amount to zero is performed (step 700).

Description

Sensor fault diagnosis method and device thereof in the fuel injection system
The present invention relates to diagnose a kind of method for diagnosing faults of the sensor fault of the Control Shaft corner that in so-called electric control fuel oil jet system, detects the control fuel injection amount, and the device of implementing this method, be specifically related to improve diagnosis and implement the method for diagnosing faults of reliability of the device of this method.
As so-called electronic fuel injection control, such electric control fuel oil jet system is extensively known, for example, electromagnetic driver in the fuel oil injectionpump drives the control sleeve of distributor type fuel oil injectionpump, the corner that connects the Control Shaft of electromagnetic driver and control sleeve then by sensor, like this with regard to the amount of movement of indirect detection to the control sleeve, the signal of sensor of feedback is controlled electromagnetic driver then, make Control Shaft rotate suitable angle (for example, referring to the open text Hei4-203349 of patent application).For example, as the sensor that detects the Control Shaft corner, may use potentiometer.
If the output of the sensor of being made up of potentiometer matches with the actual rotary position of Control Shaft always, then do not have problems in the fuel Injection Control.Under the actual conditions, sometimes owing to a variety of causes, detected value has some difference with the actual rotary position of control sleeve.
If produced difference, just may cause engine luggine, hypervelocity, even shut down.As the counter measure that overcome these shortcomings, in above-mentioned fuel Injection Control, used a kind of like this sensor fault diagnosis method, a command value is provided promptly for above-mentioned electromagnetic driver, makes Control Shaft move on to suitable pivotal position, i.e. target location, this command value and sensor to actual value compare, diagnose then,, or be not less than predetermined lower limit if the residing scope of actual value is no more than preset upper limit, then normal operation of sensor is proceeded fuel Injection Control.
But, when sensor is made up of potentiometer, if for a certain reason, a kind of liquid penetrates into sensor such as water, and promptly sensor is equivalent to be in the state of potentiometer partial short circuit, this moment, sensor just entered a kind of so-called inferior short-circuit condition, the output value of output error.As previously mentioned, whether the fault diagnosis of sensor just can not only decide the appearance of sensor fault in prespecified range according to the output value of sensor in this case.The result has a defective; Even sensor breaks down, because that this sensor is diagnosed as is working properly, just can not carries out normal oil spout and control, thereby cause engine luggine, hypervelocity, in addition out of service.
Sensor malfunction diagnostic device in the sensor fault diagnosis method and fuel injection system is provided to provide in the fuel injection system one of purpose of the present invention, and this device can strict prevent owing to detect the engine abnormity state that the fault with the sensor of the control position of the corresponding driver of electric control fuel oil jet system fuel injection quantity causes.
The trouble-shooter of sensor in the sensor fault diagnosis method and fuel injection system is provided provide in the fuel injection system, this device can strict determine to detect the fault with the sensor of the control position of the corresponding driver of electric control fuel oil jet system fuel injection quantity, and prevents because the what is called " motor is blown out " that sensor fault causes.
In order to reach above-mentioned purpose of the present invention, according to an aspect of the present invention, provide sensor fault diagnosis method in the cover fuel injection system, the appearance of the fault of the sensor that is used for described fuel injection system is diagnosed.In this system, the control position of driver is corresponding with the fuel injection quantity that fuel oil injectionpump is provided, fuel oil injectionpump is used for carrying out the fuel injection in internal-combustion engine, the control position of driver is controlled described fuel injection amount according to the checkout value of described sensor then by described sensor.
Described sensor fault diagnosis method can detect when the arbitrary situation of described sensor in following four kinds of situations takes place and be in the fault.Described four kinds of situations comprise:
First kind of situation, the revolution of described motor has surpassed predetermined value, and accelerator pedal is not stepped on, and gear moves to neutral state;
Second kind of situation, the described revolution of described motor has surpassed predetermined value, and described motor is in idling mode, and described gear moves to neutral state;
The third situation, the variation of the described revolution of described motor has surpassed predetermined value, and described motor is in acceleration mode, and described accelerator pedal is not stepped on, and described gear moves to neutral state; With
The 4th kind of situation, the variation of the described revolution N of described motor has surpassed predetermined value, and described motor is in acceleration mode, and described motor is in idling mode, and described gear moves to neutral state.
As mentioned above, when sensor enters so-called inferior short-circuit condition,, show that the situation of sensor fault should determine according to the combining case of multiple situations such as stepping on such as engine revolution, accelerator pedal from preventing the viewpoint of " motor is blown out ".If satisfied this situation, just think the sensor generation obstacle that guarantees traffic safety.But, if carried out engine braking,, consider from secure context even in this case, would rather think that sensor does not break down.Therefore, the invention is characterized in and only work as gear (for example, gearbox) when moving to neutral state, can think that sensor breaks down, do not carry out engine braking because can conclude.
According to a further aspect in the invention, provide sensor fault diagnosis method in the cover fuel injection system, diagnosed the appearance of the fault of the sensor that is used for described fuel injection system.In this fuel injection system, with the control position of carrying out with the corresponding driver of fuel injection quantity that fuel oil injectionpump provided of fuel oil injected into internal combustion engine, by described sensor, according to the checkout value of described sensor described fuel injection amount is controlled then.
Described sensor fault diagnosis method can detect described sensor and be in the fault when taking place when following four kinds of situations are one of any.Described four kinds of situations comprise:
First kind of situation, the revolution of described motor has surpassed predetermined value, and it is over and done with that described motor quickens the back scheduled time, and accelerator pedal is not stepped on;
Second kind of situation, the described revolution of described motor has surpassed described predetermined value, and it is over and done with that described motor quickens the described scheduled time of back, and described motor is in idling mode;
The third situation, the variation of the described revolution of described motor has surpassed predetermined value, and it is over and done with that described motor quickens the described scheduled time of back, and described accelerator pedal is not stepped on; With
The 4th kind of situation, the variation of the described revolution of described motor has surpassed predetermined value, and it is over and done with that described motor quickens the described scheduled time of back, and described motor is in idling mode.
As mentioned above, especially work as sensor and enter so-called inferior short-circuit condition,, show that the situation of sensor fault should determine according to the combining case of multiple situations such as stepping on such as engine revolution, accelerator pedal from preventing the viewpoint of " motor is blown out ".If satisfied this situation, just think the sensor generation obstacle that guarantees traffic safety.But, if carried out engine braking,, consider from secure context even in this case, would rather think that sensor does not break down.Therefore, the invention is characterized in that the increase when engine revolution has surpassed a predetermined value, be that engine revolution has surpassed this predetermined value, and the motor acceleration mode begins back or the variation of engine revolution, and to have surpassed the scheduled time after the predetermined value over and done with, just can think that fault has appearred in sensor, not carry out engine braking because can conclude.
In a preferred embodiment of the invention, described sensor fault diagnosis method can detect described sensor, except described four kinds of situations of statement in claim 1, be in the fault when taking place in that following four kinds of accompanying informations are one of any, and show the described fault of described sensor.Described accompanying information comprises:
The 5th kind of situation, the described revolution of described motor has surpassed predetermined value, and it is over and done with that described motor quickens the described scheduled time of back, and accelerator pedal is not stepped on;
The 6th kind of situation, the described revolution of described motor has surpassed described predetermined value, and it is over and done with that described motor quickens the described scheduled time of back, and described motor is in idling mode;
The 7th kind of situation, the variation of the described revolution of described motor has surpassed described predetermined value, and it is over and done with that described motor quickens the described scheduled time of back, and described accelerator pedal is not stepped on; With
The 8th kind of situation, the variation of the described revolution of described motor has surpassed described predetermined value, and it is over and done with that described motor quickens the described scheduled time of back, and described motor is in idling mode.
In a preferred embodiment of the invention, when described sensor is concluded when breaking down, described fuel injection amount is forced to be set at zero.
Correspondingly, can avoid motor revolution chance increase, quicken and sudden startup suddenly.
Still according to a further aspect in the invention, provide sensor malfunction diagnostic device in the cover fuel injection system, diagnosed the appearance of the fault of the sensor that is used for described fuel injection system.In this fuel injection system, with the control position of carrying out with the corresponding driver of fuel injection quantity that fuel oil injectionpump provided of fuel oil injected into internal combustion engine, by described sensor, according to the checkout value of described sensor described fuel injection amount is controlled then.The trouble-shooter of described sensor comprises:
An engine revolution detection device is used for detecting the revolution of described motor;
An aperture detection device is used for detecting the amount that accelerator pedal is stepped on;
An idling detection device is used for detecting idling mode;
A neutral gear detection device is used for the neutral state of measuring gear; With
A trouble-shooter, whether according to the output signal of described engine revolution detection device, described aperture detection device, described idling detection device and described neutral gear detection device, judging that following four kinds of situations are one of any takes place; When following four kinds of situations are one of any when taking place, detect the fault of described sensor.Described four kinds of situations comprise:
First kind of situation, the revolution of described motor has surpassed predetermined value, and accelerator pedal is not stepped on, and gear moves to neutral state;
Second kind of situation, the described revolution of described motor has surpassed described predetermined value, and described motor is in idling mode, and described gear moves to neutral state;
The third situation, the variation of the described revolution of described motor has surpassed described predetermined value, described motor sheet ground acceleration mode, described accelerator pedal is not stepped on, and described gear moves to neutral state; With
The 4th kind of situation, the variation of the described revolution of described motor has surpassed described predetermined value, and described motor is in acceleration mode, and described motor is in idling mode, and described gear moves to neutral state.
As mentioned above, sensor fault diagnosis method can be realized in the above-mentioned fuel injection system.Particularly trouble-shooter can be realized by adopting so-called CPU executive routine.
According to a further aspect in the invention, provide sensor malfunction diagnostic device in the cover fuel injection system, diagnosed the appearance of the fault of the sensor that is used for described fuel injection system.In this fuel injection system,,, according to the checkout value of described sensor described fuel injection amount is controlled then by described sensor with the corresponding driver control of the emitted dose that fuel oil injectionpump the provided position of carrying out with the fuel oil injected into internal combustion engine.Described sensor malfunction diagnostic device comprises:
An engine revolution detection device is used for detecting the revolution of described motor;
An aperture detection device is used for detecting the amount that accelerator pedal is stepped on;
An idling detection device is used for detecting idling mode; With
Whether a trouble-shooter is used for output signal according to described engine revolution detection device, described aperture detection device and described idling detection device, judge that following four kinds of situations are one of any to take place; When described four kinds of situations are one of any when taking place, detect the fault of described sensor.Described four kinds of situations comprise:
First kind of situation, described engine revolution has surpassed predetermined value, and it is over and done with that described motor quickens the back preset time, and accelerator pedal is not stepped on;
Second kind of situation, the described revolution of described motor has surpassed described predetermined value, and it is over and done with that described motor quickens the described scheduled time of back, and described motor is in idling mode;
The third situation, the variation of the described revolution of described motor has surpassed described predetermined value, and it is over and done with that described motor quickens the described scheduled time of back, and described accelerator pedal is not stepped on;
The 4th kind of situation, the variation of the described revolution of described motor has surpassed described predetermined value, and it is over and done with that described motor quickens the described scheduled time of back, and described motor is in idling mode.
In a preferred embodiment of the invention, whether described trouble-shooter judge that following four kinds of accompanying informations are one of any and take place, and in that four kinds of situations and four kinds of accompanying informations are one of any when taking place, detect the described fault of described sensor.Described four kinds of accompanying informations comprise:
The 5th kind of situation, the described revolution of described motor has surpassed described predetermined value, and it is over and done with that described motor quickens the described scheduled time of back, and described accelerator pedal is not stepped on;
The 6th kind of situation, the described revolution of described motor has surpassed described predetermined value, and it is over and done with that described motor quickens the described scheduled time of back, and described motor is in idling mode;
The 7th kind of situation, the variation of the described revolution of described motor has surpassed described predetermined value, and it is over and done with that described motor quickens the described scheduled time of back, and described accelerator pedal is not stepped on; With
The 8th kind of situation, the variation of the described revolution of described motor has surpassed described predetermined value, and it is over and done with that described motor quickens the described scheduled time of back, and described motor is in idling mode.
As mentioned above, the additional diagnostics situation is added on the diagnosis situation of above-mentioned trouble-shooter, ought satisfy arbitrary fault diagnosis situation then, just concludes that sensor breaks down.Thereby, can improve the precision of a diagnosis with respect to aforementioned diagnosis apparatus.
In a preferred embodiment of the invention, sensor malfunction diagnostic device also comprises and prevents " motor is blown out " device, when this device concludes that at described trouble-shooter described fault appears in described sensor, forces to be set at described fuel injection amount zero.
In fuel injection system in the sensor malfunction diagnostic device, provide to prevent " motor is blown out " device, be used for sensor in concluding above-mentioned diagnosis apparatus when fault has taken place, fuel injection amount is forced to be set at zero.Correspondingly, the vehicle that can avoid the increase of engine revolution chance to cause quickens suddenly and sudden startup, so just can provide so-called failure safe system.
Fig. 1 is the sketch that shows according to sensor malfunction diagnostic device structure in the fuel injection system of the embodiment of the invention.
Fig. 2 shows the flow chart of sensor fault diagnosis control program in embodiments of the present invention.
Fig. 3 is the flow chart that shows the first diagnostic procedure program.
Fig. 4 is the flow chart that shows the second opinion process procedures.
Fig. 5 is the circuit diagram that shows the circuit structure when the content of first and second diagnostic procedure shown in Figure 3 is realized by logical circuit.
Fig. 6 is the circuit diagram that shows the circuit structure when process that whether in the judging Fig. 2 cancellation situation shown in the step 700 satisfies is finished.
Fig. 7 is the flow chart that shows the program in the example of another sensor fault diagnosis control.
Fig. 8 is the circuit diagram that shows the circuit of realizing logical circuit, and this logical circuit is used for carrying out sensor fault diagnosis by logical circuit shown in Figure 7.
Below with reference to Fig. 1~8, explain embodiments of the invention.
Part, parts, device and explanation later on be not to be used to limit the present invention, and they can carry out multiple modification under the premise without departing from the scope of the invention.
At first, the Fig. 1 with reference to appended explains a structure according to sensor malfunction diagnostic device in the fuel injection system of the embodiment of the invention.
Comprise a control unit 1 that is used for fuel Injection Control and be input to the program (back is described in detail) that the various information of control unit 1 are carried out according to the sensor malfunction diagnostic device of the embodiment of the invention according to various sensors.
Especially, hereinafter a fuel Injection Control program and a sensor fault diagnosis control program of Miao Shuing is stored in the control unit 1.Be positioned at the electromagnetic driver 3 of distributor type fuel oil injectionpump 2, so-called automatically controlled speed regulator, with fuel-cut valve 4 at work by this program control when carrying out.
Control unit 1 with this function can be realized by the CPU that adopts everybody to know, promptly as the main composition element.
This program can be stored in the storage and floppy disk of CPU.This situation needs well-known floppy driver certainly.And this program also can be stored on the hard disk, when this program of execution, is read from hard disk by CPU.And this program also can be stored on the tape.If the use tape need be used well-known magnetic tape reader.
Be positioned at the sensor output of the rotation sensor 5 of distributor type fuel oil injectionpump 2, be input to control unit 1.Data are as mentioned below in the sensor output is used in fuel Injection Control and sensor fault diagnosis control respectively.Rotation sensor 5 is used for detecting the pivotal position of the Control Shaft (not expressing) of fuel oil injectionpump 2.Detect the pivotal position of Control Shaft, also just detect position with the control sleeve (not shown) that decides fuel injection quantity.
And, resemble the vehicle speed sensor 6 that detects the speed of a motor vehicle, engine rotation sensor 7 and the output of the various sensors such as jaw opening sensor 8 that aperture is quickened in detection and the so-called ON/OFF signal of Idle Switch 9 and neutral switch 10 of detection of engine revolution, be input to control unit 1.Because when the accelerator pedal (not shown) was stepped on, the contact of Idle Switch 9 was closed, Idle Switch 9 just detects motor and is in idling mode.Because the contact of neutral switch 10 is closed when changing to neutral state when gear (for example, gearbox, not shown), neutral switch 10 just detects tooth and is rotated to neutral state.
Secondly, with reference to the flow chart of appended Fig. 2, explain the program of the sensor fault diagnosis process of carrying out by control unit 1.
When sensor fault diagnosis process at the beginning the time, various data are input to control unit 1.Specifically be rotation sensor 5, vehicle speed sensor 6, engine rotation sensor 7 and jaw opening sensor 8 output signal separately, and the ON/OFF signal of Idle Switch 9 and neutral switch 10, be input to control unit 1 (referring to step 100 among Fig. 2).
After the data input, carry out first diagnostic procedure (referring to step 200 among Fig. 2).Specifically promptly in an embodiment of the present invention, the fault diagnosis of rotation sensor 5, according to the diagnosis situation difference mainly be divided into two-part, the diagnosis situation these two-part carry out in order.In step 200, carry out sensor fault diagnosis (detailed introduction is hereinafter arranged) according to one of two kinds of diagnosis situations.
The result of first diagnostic procedure is if conclude the situation satisfied (if "Yes") that can show that rotation sensor 5 breaks down, then to carry out preventing " motor is blown out " control (detailed introduction is hereinafter arranged) (seeing step 300 among Fig. 2,600)." motor is blown out " meaning is that engine revolution increases suddenly in the engine response characteristic herein.On the contrary, do not satisfy (if "No"), then carry out second opinion process (referring to step 300,400 among Fig. 2) if conclude this situation.
The result of second opinion process is, can show that the situation that rotation sensor 5 breaks down satisfies (if "Yes") if conclude, then carry out and prevent " motor is blown out " control (detailed introduction is hereinafter arranged), with first diagnostic procedure similar (referring to step 500,600 among Fig. 2).On the contrary, do not satisfy (if "No"), then end a series of failure diagnostic process, because rotation sensor 5 does not have fault if conclude this situation.This process is returned the main program (not shown) then, carries out controls such as fuel injection.
After preventing in the step 600 " motor is blown out " the control beginning, judge to show whether the situation that speed probe 5 breaks down does not satisfy, and the situation of promptly whether cancelling has satisfied (referring to Fig. 2 step 700).Do not satisfy (if "No") if conclude the cancellation situation, then the process in the repeating step 700 satisfies up to the cancellation situation.On the contrary, satisfy (if "Yes") if in step 700, conclude the cancellation situation, then carry out the cancellation process cancel or restart prevent " motor is blown out " control (detailed introduction is hereinafter arranged) (referring to step 800 among Fig. 2).End a series of processes then.
Then, with reference to the flow chart of appended Fig. 3, explain the particular content of one first diagnostic procedure.
When first diagnostic procedure begins, judge at first whether the actual revolution N of motor surpasses predetermined value Np (referring to step 202 among Fig. 3).Surpassed predetermined value Np (if "Yes") if concluded revolution N,, judged whether accelerator pedal is stepped on (referring to step 204 among Fig. 3) then according to the ON/OFF signal of jaw opening sensor 8.Do not step on (if "Yes") if concluded accelerator pedal, judge next then whether gear changes to neutral state (referring to step 206 among Fig. 3).
In above-mentioned steps 204, step on (if "No") if concluded accelerator pedal, then according to the 0N/OFF signal of Idle Switch 9, judge whether motor is in idling mode (referring to the step 210 among Fig. 3).Be in idling mode (if "Yes") if concluded motor, then proceed above-mentioned steps 206.On the contrary, be not in idling mode (if "No"), then conclude in first failure diagnostic process, show that the situation of sensor fault does not satisfy (referring to step 216 among Fig. 3) if concluded motor.End a series of processes then.
In above-mentioned steps 202, do not surpass predetermined value Np (if "No") if concluded the actual revolution N of motor, judge then whether the changes delta N of engine revolution N has surpassed preset value delta Np (referring to step 212 among Fig. 3).The revolution of the changes delta N representation unit time of engine revolution N (for example, second) motor can be calculated from the actual revolution of engine rotation sensor 7 detected motors herein.
Surpassed preset value delta Np (if "Yes") if concluded the changes delta N of engine revolution N, judged then whether motor moves to acceleration mode (referring to step 214 among Fig. 3).In other words, the changes delta N that judges engine revolution N exactly is on the occasion of (acceleration mode), or negative value (deceleration regime).Move to acceleration mode (if "Yes") if concluded motor, then return above-mentioned steps 204, carry out process above-mentioned then.
In above-mentioned steps 212, do not surpass preset value delta Np (if "No") if concluded the changes delta N of engine revolution N, perhaps in above-mentioned steps 214, concluded that motor moves to acceleration mode (if "No"), then concluded to show that in first diagnostic procedure situation that sensor breaks down does not satisfy (step 216 in referring to Fig. 3).End a series of processes then.
In a word, according to above-mentioned first fault diagnosis, conclude that the situation that sensor breaks down can be divided into following four kinds of situations.
Specifically, first kind of situation, engine revolution N has surpassed predetermined value Np, and accelerator pedal is not stepped on, and tooth is rotated to neutral state.
Second kind of situation, engine revolution N has surpassed predetermined value Np, and motor is in idling mode, and tooth is rotated to neutral state.
The third situation, the changes delta N of engine revolution N has surpassed preset value delta Np, and motor is in acceleration mode, and accelerator pedal is not stepped on, and tooth is rotated to neutral state.
The 4th kind of situation, the changes delta N of engine revolution N has surpassed preset value delta Np, and motor is in acceleration mode, and motor is in idling mode, and tooth is rotated to neutral state.
Therefore, what will be given below think, cause that then sensor fault and then execution prevent the reason (referring to step 400 among Fig. 2,500,600) of " motor is blown out " control if one of these four kinds of situations satisfy.Here it is, if one of above-mentioned four kinds of situations satisfy, and rotation sensor 5 enters inferior short-circuit condition, promptly for a certain reason, infiltrate rotation sensor 5 such as liquid such as water, therefore rotation sensor 5 output values are not the exceptional value that shows sensor fault, but rotation sensor 5 one of output and the differentiated values of Control Shaft actual rotational angle.Unless do not adopt failure safe, otherwise carry out fuel Injection Control by normal condition.The result is that engine revolution increases a lot, causes so-called " motor is blown out " state.Even worse situation is to cause motor to extinguish, rupture or cause sudden startup, quicken suddenly, thereby these become the factor that causes unfavorable condition in the traffic safety.
Especially in above-mentioned four kinds of situations, why tooth being rotated to neutral state is under the situation of carrying out the motor brake as the reason of a factor of every kind of situation, if think that sensor breaks down, and carry out the control that prevents " motor is blown out ", can cause more dangerous situation.Therefore conclude that courageously sensor does not break down, do not carry out the control that prevents " motor is blown out ", unless motor is in neutral state.
Next, with reference to the flow chart of appended Fig. 4, explain the particular content of a second opinion process.
When the second opinion process begins, judge at first whether the actual revolution N of motor has surpassed predetermined value Np (referring to step 402 among Fig. 4).Do not surpass predetermined value Np (if "No") if concluded engine revolution N, judge then whether the changes delta N of engine revolution N surpasses preset value delta Np (referring to step 404 among Fig. 4).Having surpassed preset value delta Np (if "Yes") if concluded the changes delta N of engine revolution N, is to forward step 406 hereinafter described to.Simultaneously, do not surpass preset value delta Np (if "No") if concluded the changes delta N of engine revolution N, then conclude according to this second opinion process, show that the situation that detects sensor fault does not satisfy, and ends a series of processes (referring to step 404,416 among Fig. 4) then.It is similar that the variation of engine revolution herein and above-mentioned first diagnostic procedure are explained, therefore deletes unnecessary explanation herein.
In above-mentioned steps 402, surpassed predetermined value Np (if "Yes") if concluded engine revolution N, be to judge whether motor is in acceleration mode (referring to step 406 among Fig. 4).In other words, the changes delta N that concludes engine revolution N is on the occasion of (acceleration mode), or negative value (deceleration regime).
Whether be in acceleration mode (if "Yes") if concluded motor, conclude that then the time that acceleration mode begins afterwards to pass by has surpassed the scheduled time (referring to step 4) among Fig. 4.Gone over (if "Yes") if concluded the scheduled time, then carried out step 410 hereinafter described.On the contrary, in step 406 and 408,, then conclude to show in second failure diagnostic process that the situation that sensor breaks down does not satisfy (referring to step 416 among Fig. 4) if conclude and make negative decision (if "No").End a series of processes then, so this process is returned program shown in Figure 2.
Then, in step 410,, judge whether the accelerator pedal (not shown) is stepped on (referring to step 410 among Fig. 4) according to ON/OFF signal from aperture switch 8.Do not step on (if "Yes") if conclude accelerator pedal, then conclude to show that the situation that sensor breaks down does not satisfy (referring to step 414 among Fig. 4).End a series of processes then.
In step 410, step on (if "No") if concluded accelerator pedal, then according to judging from the ON/OFF signal of Idle Switch 9 whether motor is in idling mode (referring to step 412 among Fig. 4).Close if concluded Idle Switch 9, for example, motor is in idling mode (if "Yes"), is to conclude to show that the situation that sensor breaks down satisfies (referring to step 414 among Fig. 4).End a series of processes then.But in step 412, be not in idling mode (if "No"), then conclude to show that the situation that sensor breaks down does not satisfy (referring to step 416 among Fig. 4) if concluded motor.End a series of processes then.
At last, conclude that according to above-mentioned second failure the situation that sensor breaks down can be divided into following four kinds of situations.
Specifically, first kind of situation, engine revolution N has surpassed predetermined value Np, and it is over and done with that motor quickens the back scheduled time, and accelerator pedal is not stepped on.
Second kind of situation, engine revolution N has surpassed predetermined value Np, and it is over and done with that motor quickens the back scheduled time, and motor is in idling mode.
The third situation, the changes delta N of engine revolution N has surpassed preset value delta Np, and it is over and done with that motor quickens the back scheduled time, and accelerator pedal is not stepped on.
The 4th kind of situation, the changes delta N of engine revolution N has surpassed preset value delta Np, and it is over and done with that motor quickens the back scheduled time, and motor is in idling mode.
In this type, what hereinafter will be given think in that these four kinds of situations are one of any when satisfying, cause that sensor fault carries out the reason (referring to step 400,500,600 among Fig. 2) that prevents " motor is blown out " control.In other words, satisfy if one of above-mentioned four kinds of situations are any, and rotation sensor 5 enters inferior short-circuit condition, promptly, for a certain reason, infilter rotation sensor 5 such as liquid such as water, thereby the output value of rotation sensor 5 is not the exceptional value that shows that sensor breaks down, but rotates the differentiated value of actual rotational angle of sensing 5 outputs and Control Shaft.Unless do not adopt failsafe, otherwise carry out fuel Injection Control by normal condition.The result is that engine revolution further increases, and causes so-called " motor is blown out " state.Even worse situation is to cause motor to extinguish, rupture or cause sudden startup, quicken suddenly, thereby these become the factor that causes unfavorable condition in the traffic safety.
Especially in above-mentioned the third situation, the variation of engine revolution N is surpassed the reason that predetermined value and accelerator pedal do not step on as the element of various situations is, when the variation of engine revolution N surpasses predetermined value and accelerator pedal and steps on, may carry out engine braking.Therefore, in this case, if think that sensor breaks down, and carried out the control that prevents " motor is blown out ", because the engine braking disconnection can cause more dangerous situation, therefore conclude that certainly sensor does not break down, and do not carry out the control that prevents " motor is blown out ".
Below, explain the particular content (referring to step 600 among Fig. 2) that prevents " motor is blown out " control.
If conclude the situation of satisfied (referring to step 300,500 among Fig. 2) first diagnosis (referring to step 200 among Fig. 2) or second opinion (referring to step 400 among Fig. 2), then carry out preventing " motor is blown out " control.This control in fuel Injection Control, is set at zero with the oil spout aim parameter, does not so just carry out the fuel injection from fuel oil injectionpump 2 to the motor (not shown).Correspondingly, engine speed does not unnecessarily increase, thereby has prevented so-called " motor is blown out ", has just prevented unexpected acceleration and sudden startup yet, has avoided engine failure, destruction etc.
Then, the content of specific explanations cancellation situation (referring to step 700 among Fig. 2).In an embodiment of the present invention, when concluding that engine revolution is less than predetermined value NL, or surpassed predetermined value when concluding that accelerator pedal is stepped on, and Idle Switch 9 is thought and is satisfied the cancellation situation when pushing OFF position (being that motor is not in idling mode).Then, normal fuel Injection Control (referring to step 800 among Fig. 2) is returned in the control that prevents " motor is blown out " (referring to step 600 among Fig. 2) that termination is mentioned.
In above-mentioned example, the engine revolution detection device comprises 7, one aperture detection devices of an engine rotation sensor, i.e. 8, one idling detection devices of jaw opening sensor, i.e. and Idle Switch 9 and a neutral gear detection device, promptly neutral switch 10.
Step 100 to 500 (see figure 2) that trouble-shooter is carried out by control unit 1 realizes, and prevents that " motor is blown out " device from being that step 600 (see figure 2) by control unit 1 execution realizes.
Next, with reference to appended Fig. 5 and Fig. 6, explain second example of the circuit structure when above-mentioned first and second diagnostic procedures are realized with logical circuit.
5 explain a logical circuit that is used for producing starting " motor is blown out " control at first, with reference to the accompanying drawings.The structure of this logical circuit is with the logic output of first "AND" circuit 16 and second "AND" circuit 17, is input to first OR circuit 15.The logic output of first "AND" circuit 16 is consistent with the situation that satisfies above-mentioned first diagnostic procedure.The logic output of second "AND" circuit 17 is consistent with the situation that satisfies above-mentioned second opinion process.
First "AND" circuit 16 has three inputs.Second OR circuit 18 hereinafter described and the output of the logic of the 3rd OR circuit 19, and logical signal S6 are imported contacts for three that are input to first "AND" circuit 16 respectively.Second OR circuit 18 has two inputs.The logic output of logical signal S1 hereinafter described and the 3rd "AND" circuit 12 is imported contacts for two that are input to second OR circuit 18 respectively.The 3rd "AND" circuit 20 has two inputs.Hereinafter described logical signal S2, S3 import two input contacts of second "AND" circuit 20 respectively.
The 3rd OR circuit 19 has two inputs.Hereinafter described logical signal S4, S5 are input to two input contacts of the 3rd OR circuit respectively.
Simultaneously, second "AND" circuit 17 has two inputs.The logic output of the 4th OR circuit 21 and the 5th OR circuit 22 is input to two input contacts of second "AND" circuit respectively.
The 4th OR circuit 21 has two inputs.The logarithm output of the 4th "AND" circuit 23 and the 5th "AND" circuit 24 is input to two input contacts of the 4th OR circuit 21 respectively.
The 4th ' with " circuit " 23 two inputs are arranged.Hereinafter described logical signal S1, S7 are input to two input contacts of the 4th "AND" circuit 23 respectively.The 5th "AND" circuit 24 has two inputs.Hereinafter described logical signal S2, S7 are input to two input contacts of the 5th "AND" circuit 24 respectively.
The 5th OR circuit 22 has two inputs.Logical signal S4, S5 are input to two input contacts of the 5th OR circuit 22 respectively.
As mentioned above, when engine revolution N has surpassed predetermined value Np, logical signal S1 becomes a note logic value.When the changes delta N of engine revolution N has surpassed preset value delta Np, logical signal S2 becomes a high logic value.When motor is in acceleration mode, logical signal S3 becomes a high logic value, in other words, the changes delta N of engine revolution N be on the occasion of.
Therefore, S1 becomes high logic value when logical signal, or when signal S2, S3 became high logic value simultaneously, the output of the logic of second OR circuit 18 was high logic value,
When accelerator pedal was stepped on, logical signal S4 became a high logic value.When Idle Switch 9 is closed, when promptly motor was in idling mode, logical signal S5 became a high logic value.
Correspondingly, one of them becomes high logic value as logical signal S4 and S5, and the logic output of the 3rd OR circuit 19 is high logic values.
In addition, when gear moves to neutral state, logical signal S6 becomes a high logic value.When motor is in acceleration mode, and motor to quicken the back scheduled time over and done with, logical signal S7 becomes a high logic value.
In a word, the logic of first "AND" circuit 16 output is that the situation of high logic value can be divided into following four kinds of situations.
Specifically, first kind of situation, engine revolution N has surpassed predetermined value Np, and accelerator pedal is not stepped on, and gear moves to neutral state.
Second kind of situation, engine revolution N has surpassed predetermined value Np, and motor is in idling mode, and gear moves to neutral state.
The third situation, the changes delta N of engine revolution N has surpassed preset value delta Np, and motor is in acceleration mode, and accelerator pedal is not stepped on, and gear moves to neutral state.
The 4th kind of situation, the changes delta N of engine revolution N has surpassed preset value delta Np, and motor is in acceleration mode, and motor is in idling mode, and gear moves to neutral state.
On the other hand, when logical signal S1 and S7 become high logic value, or when logical signal 22 and 27 became high logic value, the output of the logic of the 4th OR circuit 21 was high logic value.
When one of them became high logic value as logical signal S4 and S5, the output of the logic of the 5th OR circuit 22 was high logic value.
At last, the logic of second "AND" circuit 17 output is that the situation of high logic value can be divided into following four kinds of situations.
Specifically, first kind of situation, engine revolution N has surpassed predetermined value Np, and it is over and done with that motor quickens the back scheduled time, and accelerator pedal is not stepped on.
Second kind of situation, engine revolution N has surpassed predetermined value Np, and it is over and done with that motor quickens the back scheduled time, and motor is in idling mode.
The third situation, the changes delta N of engine revolution N has surpassed preset value delta Np, and it is over and done with that motor quickens the back scheduled time, and accelerator pedal is not stepped on.
The 4th kind of situation, the changes delta N of engine revolution N has surpassed preset value delta Np, and it is over and done with that motor quickens the back scheduled time, and motor is in idling mode.
Because when the signal with high logic value is sent to first OR circuit 15, the control of above-mentioned preventing " motor is blown out " (referring to step 600 among Fig. 2) is just started, therefore the operation with reference to figs. 2 to 4 similar process of being explained that can carry out and adopt software to carry out.
Then, explain the structure that cancellation prevents the circuit of " motor is blown out " control (referring to step 600 among Fig. 2) with reference to appended Fig. 6.
Logical circuit can realize with above-mentioned Fig. 2 in the corresponding to operation of process of step 700, it comprises with the 6th OR circuit 25 of two input contacts with the 6th "AND" circuits 26 of two input contacts.
The logic output of hereinafter described logical signal S8 and the 6th "AND" circuit 26 is input to the 6th OR circuit 25.Hereinafter described logical signal S9, S10 are input to the 6th "AND" circuit 26.
When engine revolution was lower than predetermined value NL, logical signal S8 became high logic value.When the accelerator pedal depression amount was higher than predetermined value, logical signal S9 became high logic value.When Idle Switch 9 pushed OFF (when motor is not in idling mode), logical signal S10 became high logic value.
Correspondingly, when dropping to, engine revolution N is lower than predetermined value NL, or be higher than predetermined value when the accelerator pedal depression amount, and when Idle Switch 9 pushed OFF (when motor is not in idling mode), the 6th OR circuit 25 exported the signal that the cancellation with high logic prevents " motor is blown out " control.
Do not have at vehicle under the situation of Idle Switch 9, the sensor diagnosis control just there is no need motor is in idling mode (referring to step 412 among step 210 among Fig. 3 and Fig. 4) as showing one of situation that sensor breaks down.
And first diagnostic procedure (referring to step 200 among Fig. 2) that above-mentioned control is performed and second opinion process (referring to step 400 among Fig. 2) in order to simplify sensor fault diagnosis control, can only be carried out one of them.
Referring to Fig. 1 and Fig. 7, explain another example of sensor malfunction diagnostic device.
Sensor malfunction diagnostic device in this example is identical with the top structure of being explained with reference to figure 1, therefore deletes detailed explanation herein.Explain the particular content of the sensor fault diagnosis process of carrying out by control unit 1 with reference to figure 7.
When process begins, at first various data are input to control unit 1.It specifically is exactly signal of sensor separately such as rotation sensor 5, vehicle speed sensor 6, engine rotation sensor 7 and jaw opening sensor 8, and Idle Switch 9 and neutral switch 10 ON/OFF signal separately, be input to control unit 1 (referring to step 900 among Fig. 7).
After the data input, judge that whether the speed of a motor vehicle is less than zero (referring to step 902 among Fig. 7).If conclude vehicle, judge that then whether fuel injection quantity Q from fuel oil injectionpump 2 is less than predetermined value Qp (referring to step 904 among Fig. 7) less than zero (if "Yes").
In step 904,, judge then that fuel injection quantity drops to and whether be lower than behind the predetermined value Qp scheduled time or longer time over and done with (referring to step 906 among Fig. 7) if concluded fuel injection quantity Q less than predetermined value Qp (if "Yes").If concluded the scheduled time over and done with (if "Yes"), judge then whether engine revolution N has surpassed predetermined value Np (referring to step 908 among Fig. 7).
In step 908, surpassed predetermined value Np (if "Yes") if concluded engine revolution N, judge then whether this engine revolution N that has surpassed predetermined value Np has continued the scheduled time or longer (seeing step 910 among Fig. 7).If concluded the scheduled time or longer time over and done with (if "Yes"), judged then whether the changes delta N of engine revolution N has surpassed preset value delta Np (seeing step 912 among Fig. 7).
Surpassed preset value delta Np (if "Yes") if concluded the changes delta N of engine revolution N, judged then whether accelerator pedal does not step on (seeing step 914 among Fig. 7).Do not step on (if "Yes") if concluded accelerator pedal, judge then whether motor is in idling mode (seeing step 916 among Fig. 7).
In step 916, be in idling mode (if "Yes") if concluded motor, think that then rotation sensor 5 breaks down.Therefore, carry out the fuel Injection Control process (seeing step 918 among Fig. 7,920) of ending.
In other words, end the operation (seeing step 918 among Fig. 7) of electromagnetic driver 3 in the fuel oil injectionpump 2 and the operation (seeing step 920 among Fig. 7) of fuel-cut valve 4.Therefore, fuel injection is forced to end, and ends a series of processes then.
The judged result that one of above-mentioned steps 902,904,906,908,910,912,914,916 is wherein any is if "No", then thinks sensor 5 faults that do not rotate, and ends a series of processes then.Return the main program (not shown), carry out fuel Injection Control by normal condition.
In the above-mentioned control, the speed of a motor vehicle is elected to be the reason that shows one of situation that sensor breaks down less than zero is, under the situation of having carried out the motor brake, even in fact rotation sensor 5 operations are normal, other situation except that the speed of a motor vehicle also satisfies sometimes, therefore under the situation of having carried out the motor brake, above-mentioned control is considered to invalid.
In above-mentioned control, so-called backout feature is not provided especially, make that this process is returned normal running when electromagnetic driver 3 and fuel-cut valve 4 have stopped that afterwards special circumstances satisfy.Therefore, push OFF once if work as the key of so-called vehicle motor, above-mentioned situation did not satisfy when right engine key pushed ON again, then returned normal operation.
Below, explain a circuit structure of implementing above-mentioned control with reference to appended Fig. 8.
In above-mentioned control,, then stop the operation of electromagnetic driver 3 and fuel-cut valve 4 if the estimate of situation of deterministic process all satisfies (if "Yes") separately.Draw thus, the structure of logical circuit can with six the input contacts "AND" circuit 27 realize, as shown in Figure 8.
When the speed of a motor vehicle is lower than zero, become a high logic value as the logical signal Sa of input signal.When fuel injection quantity is less than predetermined value, and this situation has continued the scheduled time or when longer, logical signal Sb becomes a high logic value.When engine revolution N has surpassed predetermined value Np, and this situation has continued the scheduled time or when longer, logical signal Sc becomes a high logic value.
In addition, when the changes delta N of engine revolution N had surpassed preset value delta Np, logical signal Sd became a high logical signal.When accelerator pedal was not stepped on, logical signal Se became a high logic value.When motor was in idling mode, logical signal Sf became a high logic value.
When these logical signals all become high logic value, with the output of circuit 27 are high logic values.Therefore, this signal stops the operation of electromagnetic driver 3 and fuel-cut valve 4.
Do not have at vehicle under the situation of Idle Switch 9, there is no need idling situation (seeing step 916 among Fig. 7) as one of situation of above-mentioned control.
As mentioned above, the present invention can construct to such an extent that make the fuel injection system intermediate fuel oil spray the used sensor of control, is not used to fuel Injection Control when it breaks down, particularly when it is in so-called inferior short-circuit condition.The result is, unlike the prior art, can avoid owing to enter so-called inferior short-circuit condition and be used to the mistake output of the sensor of fuel Injection Control, and the engine revolution of the chance that is caused increases, promptly so-called " motor is blown out ".Owing to this reason, can prevent the sudden startup of vehicle and quicken suddenly, also can avoid because fault and the destruction that racing of the engine causes, and the present invention can make contributions to improving traffic safety.

Claims (8)

1. sensor fault diagnosis method in the fuel injection system, be used for diagnosing the generation of the fault of the sensor that is used for described fuel injection system, in described system, with the corresponding driver control of the fuel injection quantity position that is used in internal-combustion engine, carrying out the fuel-injected fuel oil injectionpump, by described sensor, the value that arrives according to described sensor is controlled described fuel injection quantity then.
Described sensor fault diagnosis method can detect that fault has taken place described sensor when four kinds of situations are one of any when taking place, and described four kinds of situations comprise:
First kind of situation, the revolution of described motor has surpassed predetermined value, and accelerator pedal is not stepped on, and gear moves to neutral state;
Second kind of situation, the described revolution of described motor has surpassed described predetermined value, and described motor is in idling mode, and described gear moves to neutral state;
The third situation, the variation of the described revolution of described motor has surpassed described predetermined value, and described motor is in acceleration mode, and described accelerator pedal is not stepped on, and described gear moves to neutral state; With
The 4th kind of situation, the variation of the described revolution N of described motor has surpassed described predetermined value, and described motor is in acceleration mode, and described motor is in idling mode, and described gear moves to neutral state.
2. sensor fault diagnosis method in the fuel injection system, be used for diagnosing the generation of the fault of the sensor that is used for described fuel injection system, in described system, with the corresponding driver control of the fuel injection quantity position that is used in internal-combustion engine, carrying out the fuel-injected fuel oil injectionpump, by described sensor, the value that arrives according to described sensor is controlled fuel injection quantity then.
Described sensor fault diagnosis method can detect that fault has taken place described sensor when four kinds of situations are one of any when taking place, and described four kinds of situations comprise:
First kind of situation, the revolution of described motor has surpassed predetermined value, and it is over and done with that described motor quickens the back scheduled time, and accelerator pedal is not stepped on;
Second kind of situation, the described revolution of described motor has surpassed described predetermined value, and it is over and done with that described motor quickens the described scheduled time of back, and motor is in idling mode;
The third situation, the variation of the described revolution of described motor has surpassed described predetermined value, and it is over and done with that described motor quickens the described scheduled time of back, and described accelerator pedal is not stepped on; With
The 4th kind of situation, the described variation of the described revolution of described motor has surpassed described predetermined value, and it is over and done with that described motor quickens the described scheduled time of back, and described motor is in idling mode.
3. according to the sensor fault diagnosis method of claim 1, wherein said sensor fault diagnosis method can be worked as except that right requires described four kinds of situations of 1 statement, one of four kinds of accompanying informations are any when taking place, detect described sensor and break down, and show the described fault of described sensor.Described four kinds of accompanying informations comprise:
The 5th kind of situation, the described revolution of described motor has surpassed described predetermined value, and it is over and done with that described motor quickens the described scheduled time of back, and described accelerator pedal is not stepped on;
The 6th kind of situation, the described revolution of described motor has surpassed described predetermined value, and it is over and done with that described motor quickens the described scheduled time of back, and described motor is in idling mode;
The 7th kind of situation, the described variation of the described revolution of described motor has surpassed described predetermined value, and it is over and done with that described motor quickens the described scheduled time of back, and described accelerator pedal is not stepped on; With
The 8th kind of situation, the described variation of the described revolution of described motor has surpassed described predetermined value, and it is over and done with that described motor quickens the described scheduled time of back, and described motor is in idling mode.
4. according to claim 1,2 and 3 one of any sensor fault diagnosis methods, concluded when described sensor wherein fault taken place that described fuel injection quantity is forced to be set at zero.
5. sensor malfunction diagnostic device in the fuel injection system, be used for diagnosing the generation of the fault of the sensor that is used for described fuel injection system, in described system, with the corresponding driver control of the fuel injection quantity position that is used in internal-combustion engine, carrying out the fuel-injected fuel oil injectionpump, by described sensor, the value that arrives according to described sensor is controlled fuel injection quantity then.Described sensor malfunction diagnostic device comprises:
An engine revolution detection device is used for detecting the revolution of described motor;
An aperture detection device is used for detecting the amount that accelerator pedal is stepped on;
An idling detection device is used for detecting idling mode;
A neutral gear detection device is used for the neutral state of measuring gear; With
A trouble-shooter, be used for output signal according to described engine revolution detection device, described aperture detection device, described idling detection device and described neutral gear detection device, whether judge that four kinds of situations are one of any takes place, and, detect the fault of described sensor when described four kinds of situations are one of any when taking place.Described four kinds of situations comprise:
First kind of situation, the revolution of described motor has surpassed predetermined value, and accelerator pedal is not stepped on, and gear moves to neutral state;
Second kind of situation, the described revolution of described motor has surpassed described predetermined value, and described motor is in idling mode, and described gear moves to neutral state;
The third situation, the described variation of the described revolution of described motor has surpassed described predetermined value, and described motor is in acceleration mode, and described accelerator pedal is not stepped on, and described gear moves to neutral state; With
The 4th kind of situation, the described variation of the described revolution of described motor has surpassed described predetermined value, and described motor is in acceleration mode, and described motor is in idling mode, and described gear moves to neutral state.
6. sensor malfunction diagnostic device in the fuel oil spray system, be used for diagnosing the generation of the fault of the sensor that is used for described fuel injection system, in described system, with the corresponding driver control of the fuel injection quantity position that is used in internal-combustion engine, carrying out the fuel-injected fuel oil injectionpump, by described sensor, the value that arrives according to described sensor is controlled fuel injection quantity then.Described sensor malfunction diagnostic device comprises:
An engine revolution detection device is used for detecting the revolution of described motor;
An aperture detection device is used for detecting the amount that accelerator pedal is stepped on;
An idling detection device is used for detecting idling mode; With
A trouble-shooter, be used for output signal according to described engine revolution detection device, described aperture detection device and described idling detection device, whether take place, and when described four kinds of situations are one of any when taking place, detect the fault of described sensor if judging that four kinds of situations are one of any.Described four kinds of situations comprise:
First kind of situation, the revolution of described motor has surpassed predetermined value, and it is over and done with that described motor quickens the back scheduled time, and accelerator pedal is not stepped on;
Second kind of situation, the described revolution of described motor has surpassed described predetermined value, and it is over and done with that described motor quickens the described scheduled time of back, and described motor is in idling mode;
The third situation, the described variation of the described revolution of described motor has surpassed described predetermined value, and it is over and done with that described motor quickens the described scheduled time of back, and described accelerator pedal is not stepped on; With
The 4th kind of situation, the described variation of the described revolution of described motor has surpassed described predetermined value, and it is over and done with that described motor quickens the described scheduled time of back, and described motor is in idling mode.
7. according to the trouble-shooter of the sensor of claim 5, whether wherein said trouble-shooter is judged that four kinds of accompanying informations are one of any and is taken place, and, detect the described fault of described sensor when four kinds of situations are one of any when taking place with four kinds of accompanying informations are one of any.Described four kinds of accompanying informations comprise:
The 5th kind of situation, the described revolution of described motor has surpassed described predetermined value, and it is over and done with that described motor quickens the described scheduled time of back, and described accelerator pedal is not stepped on;
The 6th kind of situation, the described revolution of described motor has surpassed described predetermined value, and it is over and done with that described motor quickens the described scheduled time of back, and described motor is in idling mode;
The 7th kind of situation, the described variation of the described revolution of described motor has surpassed described predetermined value, and it is over and done with that described motor quickens the described scheduled time of back, and described accelerator pedal is not stepped on; With
The 8th kind of situation, the described variation of the described revolution of described motor has surpassed described predetermined value, and it is over and done with that described motor quickens the described scheduled time of back, and described motor is in idling mode.
8. according to claim 5,6 or 7 sensor malfunction diagnostic device, comprise that also one prevents that motor from blowing out device, be used for when described trouble-shooter concludes that described fault takes place described sensor, described fuel injection quantity is forced to be set at zero.
CN97125460A 1996-12-12 1997-12-11 Sensor failure diagnosis method in fuel injection system and sensor failure diagnosis apparatus in fuel injection system Expired - Fee Related CN1085783C (en)

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