KR19980020877A - How to troubleshoot accelerator pedal sensor of vehicle - Google Patents

Abstract

The present invention relates to a method for diagnosing a failure of an accelerator pedal sensor of a vehicle, and more particularly, to a method for diagnosing an accelerator pedal sensor in a vehicle equipped with a diesel electronic fuel injection device.

In the present invention, when the driver does not step on the accelerator pedal, if the engine speed and the phase of the vehicle continues an abnormal imbalance relationship for a predetermined time, it is determined that it is abnormal output of the accelerator pedal sensor and warned so that safety measures can be taken immediately. It prevents traffic congestion, which can occur regardless of the driver's intention, to prevent traffic safety accidents.

Description

How to troubleshoot accelerator pedal sensor of vehicle

The present invention relates to a method for diagnosing a failure of an accelerator pedal sensor of a vehicle, and more particularly, to a method of diagnosing an accelerator pedal sensor in a vehicle equipped with a diesel electronic fuel injection device.

In general, the electronically controlled diesel engine applied to diesel vehicles improves the problems of diesel engines such as cold startability, idling control, emission control of soot and nitrogen oxides (NO _x ), supercharger operation control, and hunting control by electronic control. It is known to have advantages.

Here, the injection rate control principle of the general electronically controlled diesel engine (ECD), the basic injection amount is first calculated by the accelerator pedal sensor and the engine speed sensor in the controller, and then the basic value is determined by the signals of the water temperature sensor, the intake temperature sensor, and the starting motor. The injection amount is corrected and the feedback is corrected by the signal of the spilling position sensor to determine the optimum fuel injection amount. Therefore, it is possible to adjust the fuel injection amount even in unusual driving conditions such as driving at high temperatures where the density of intake air is reduced during low temperature startup, acceleration, and supercharger operation.

In other words, the amount of fuel supplied to the engine is determined from a previously prepared map according to the value recognized by the accelerator pedal sensor and the engine speed by the driver's stepping on the accelerator pedal (see FIG. 1).

Therefore, in order to precisely control the fuel injection amount, it is necessary to perform failure diagnosis of the accelerator pedal sensor. In the past, however, the self-diagnosis function has been provided to perform fault diagnosis limited to the output range of the accelerator pedal sensor.

However, in the case of the conventional electronically controlled diesel engine, since only the output range of the accelerator pedal sensor (accelerator pedal position sensor) is checked, for example, as shown in FIG. 2, the normal output (VACC) of the accelerator pedal sensor is V. ₁ If it is in the range of VACC V ₂ , it will be recognized as a fault only if VACC is out of the above range. As the output signal of the accelerator pedal sensor increases, the congestion of the vehicle may occur due to the sudden increase in the fuel injection amount, which may inadvertently cause a traffic safety accident.

Therefore, in the present invention, when the driver does not step on the accelerator pedal and the relationship between the engine speed and the vehicle speed is abnormal for a certain period of time, it is determined that the output of the accelerator pedal sensor is abnormal and warned to take safety measures immediately. It is an object of the present invention to provide a method for diagnosing the accelerator pedal sensor failure of a vehicle to prevent the congestion of the vehicle that may occur regardless of the driver's intention.

1 is a graph showing the relationship between the accelerator opening and the engine speed in the failure diagnosis method of the accelerator pedal sensor applied to a conventional vehicle.

2 is a graph showing the relationship between the accelerator opening degree and the accelerator pedal sensor output when a failure diagnosis is performed considering only the output range of the accelerator pedal sensor.

(When the normal output of the accelerator pedal sensor is VACC)

Figure 3 is an accelerator pedal output failure diagnostic apparatus of the present invention.

Figure 4 is a detailed view of the controller of the present invention.

5 is a control flow chart of the present invention.

(Explanation of symbols for the main parts of the drawing)

One ; Sensing unit 2; Control

3; Output section ISW; Idle switch

ES; Engine speed sensor SS; Vehicle speed sensor

E; Engine speed S; Vehicle speed

Accelerator pedal sensor failure diagnosis method of the present invention for achieving the above object provides the following features.

Determining a state of not pressing the accelerator pedal through an idle switch (ISW) constituting the sensing unit 1;

Determining whether the engine speed E is equal to or greater than a predetermined speed A [rpm] through the engine speed sensor ES constituting the sensing unit 1;

Checking whether the vehicle speed sensor SS constituting the sensing unit 1 is normal and determining whether the vehicle speed S is equal to or less than a predetermined speed B [km / h] through the same vehicle speed sensor SS;

Judging whether the conditions detected by the detection unit 1 continue for a predetermined time (c time), and outputting an abnormal warning signal of an accelerator pedal to the output unit 3 when all conditions are satisfied;

Including the accelerator pedal sensor will be diagnosed more extensively.

Therefore, according to the present invention, it is possible to prevent the congestion of the vehicle due to the sudden increase in the fuel injection amount regardless of the driver's intention.

(Example)

Hereinafter, the present invention will be described in more detail with reference to the accompanying example drawings.

FIG. 3 is a block diagram schematically illustrating an accelerator pedal output fault diagnosis apparatus of the present invention, and FIG. 4 is a detailed view of a controller of the present invention, in which 1 is a detector, 2 is a controller, and 3 is a The output part is displayed, ISW is the idle switch, ES is the engine speed sensor, and SS is the vehicle speed sensor.

The accelerator pedal output fault diagnosis apparatus of the present invention comprises a detection unit 1, a control unit 2, and an output unit 3, wherein the detection unit 1 is an idle switch (ISW) for checking the stepped state of the accelerator pedal. ) And the engine speed sensor (ES) to check the engine speed (rpm) and the vehicle speed sensor (SS) to check the running speed of the vehicle detected conditions (ON state of the children switch, Engine speed, vehicle speed) to the control unit (2).

The control unit 2 has an AND gate element AND that accepts the conditions of each of the transmission stages in the sensing unit 1 so that each sensed condition is satisfied and the satisfactory conditions continue for a predetermined time (C time). If it is determined that the accelerator pedal output is broken, the signal is output to the output unit 3.

The output unit 3 includes a warning lamp, a speaker, and the like, and when the signal is transmitted from the control unit 2, it outputs a signal (display, voice) into the vehicle.

Therefore, the present invention is to measure the output abnormality of the accelerator pedal through the simple accelerator pedal output failure diagnosis device described above, referring to the control flow diagram of FIG. 5, first, the control unit 2 constitutes the sensing unit 1. Check the ON state of the idle switch (ISW) to see if the driver has not pressed the accelerator pedal.

If the condition is satisfied, the engine speed sensor ES checks whether the current engine speed E is equal to or greater than a predetermined predetermined speed A [rpm].

If the condition is satisfied, the vehicle speed sensor (SS) checks whether it is normal, and if it is confirmed that it is normal, the current vehicle speed (S) continues to check whether the predetermined speed (B [km / h]) or less.

If the condition is satisfied, it is determined whether all these conditions continue for a predetermined time (C time). If the condition lasts for a predetermined time (C time), it is determined that the output of the accelerator pedal sensor is abnormal. By outputting the signal to the driver, the driver is informed that an error has occurred in the output of the accelerator pedal sensor.

Thus, according to the accelerator pedal sensor failure diagnosis method of the present invention, the engine speed and the vehicle speed are measured without being limited to the output range of the accelerator pedal sensor, and the engine speed and the vehicle speed are equal to or higher than the constant rotation speed (A [rpm]), and the constant vehicle speed (B [km / h]) If the following condition persists, it is judged to be an abnormal output of the accelerator pedal, and an alarm signal is sent to prevent the runaway driving that may occur regardless of the driver's intention, thereby preventing traffic safety accidents in advance. It can be harvested.

What has been described above is only one embodiment for explaining a method for diagnosing accelerator pedal sensor failure of a vehicle according to the present invention, and the present invention is not limited to the above-described embodiment, and the present invention claims in the following claims. Various changes can be made by those skilled in the art without departing from the gist of the present invention.

Claims (1)

Determining a state of not pressing the accelerator pedal through an idle switch (ISW) constituting the sensing unit 1; Determining whether the engine speed E is equal to or greater than a predetermined speed A [rpm] through the engine speed sensor ES constituting the sensing unit 1; Checking whether the vehicle speed sensor SS constituting the sensing unit 1 is normal and determining whether the vehicle speed S is equal to or less than a predetermined speed B [km / h] through the same vehicle speed sensor SS; Determining whether the conditions detected by the detection unit 1 continue for a predetermined time (C time), and outputting an abnormal warning signal of an accelerator pedal to the output unit 3 when all conditions are satisfied; Accel pedal sensor failure diagnosis method of a vehicle, characterized in that made.