KR100815149B1 - Diagnostic apparatus for fuel supply pump controller - Google Patents

Abstract

A self-diagnostic apparatus for a fuel supply pump controller is provided to determine defect of the controller and a fuel supply pump by using only one exclusive OR gate. A self-diagnostic apparatus for a fuel supply pump controller comprises a fuel supply pump(200) that supplies fuel to an engine of a vehicle. A controller(210) controls the amount of the fuel in the fuel supply pump. An interface box(220) outputs a failure diagnosis signal of the controller. The controller includes a self-diagnostic section having an exclusive OR gate. When the controller and the fuel supply pump normally operate, the self-diagnostic section outputs a frequency of 5Hz. When the controller is in an abnormal state, the self-diagnostic section outputs a frequency of 15Hz. When the fuel supply pump is in an abnormal state, the self-diagnostic section outputs a frequency of 8Hz.

Description

Diagnostic apparatus for fuel supply pump controller

1 is a block diagram showing the configuration of a conventional fuel pump diagnostic apparatus for an Elpia vehicle;

Figure 2 is a block diagram for a conventional fuel pump and driver diagnostic apparatus,

3 is a block diagram of a self-diagnosis system according to the present invention;

4 is a self-diagnostic unit embedded in the controller shown in FIG. 3;

5 is a signal waveform representing the normal output from the self-diagnosis unit,

6 is a signal waveform showing a failure of the controller output from the self-diagnosis unit,

7 is a signal waveform showing a failure of the fuel supply pump output from the self-diagnosis unit.

* Description of the symbols for the main parts of the drawings *

100: interface box (IF / BOX: interface box)

110: controller

120: fuel supply pump

130: self-diagnosis unit

The present invention relates to a self-diagnostic apparatus of a fuel supply pump controller, and more particularly, to a self-diagnostic apparatus of a fuel supply pump controller for diagnosing and displaying respective failures of a fuel supply pump and a fuel supply controller.

Among the fuels used in automobiles, the liquefied petroleum injection fuel is used in some passenger cars and vans because of its high octane value, excellent heat resistance, and low fuel cost.

The LPG fuel supplied to the engine of the car is liquid, and when it is vaporized, it is highly mixed with air, so it is highly flammable, so knocking is less likely to occur than gasoline and diesel. Vapor-Lock or percolation Since the occurrence of such a phenomenon can be prevented, its application range is gradually increasing as an alternative fuel of gasoline or diesel fuel.

Here, the LLP fuel device supplies an LLP fuel to a gas injector in the liquid phase using a fuel pump, injects LLP fuel into a cylinder through the gas injector, and the injected LLP fuel is vaporized after mixing air. Run the engine.

Accordingly, the combined Ellipse and gasoline vehicle uses a vaporizer, a mixer and an Elpgi fuel tank, a solenoid valve that controls the supply of the Elpige fuel, and a sub-IC oil controlling the solenoid valve. It must be provided.

However, since there is no method for diagnosing whether or not the fuel pump is normally operated in a vehicle of the conventional ELPIA, it is often a problem that the determination of the failure of the fuel pump takes a long time and the safety of the vehicle is often deteriorated.

An example of a technique for solving such a problem is disclosed in "Korean Patent Publication No. 2006-0035107 (April 26, 2006), Korean Patent Publication No. 2007-0028677 (March 13, 2007)" and the like.

That is, the Republic of Korea Patent Publication No. 2006-0035107 (April 26, 2006) is connected to the output side of the fuel pump 120 as shown in Figure 1 to generate a pump diagnostic signal in accordance with the driving state of the fuel pump The fuel pump diagnosis unit 110 outputs through the diagnosis line and the pump diagnosis signal of the fuel pump diagnosis unit 130 supplied through the diagnosis line for diagnosing the normal operation of the fuel pump 120 and the failure of the diagnosis line. Disclosed is a fuel pump diagnosis apparatus including a sub ISO 130 including a program.

That is, the fuel pump diagnosis unit 110 generates a pump diagnosis signal at a frequency of 5 Hz when the fuel pump 120 is in normal operation, and supplies it to the sub ISO 130 through the diagnostic line, and the fuel pump is in abnormal operation. A pump diagnostic signal of a frequency of 10 Hz is generated and supplied to the sub IC via a diagnostic line. When an abnormality occurs in the diagnostic line, a pump diagnostic signal having a predetermined voltage is generated and supplied to the sub IC.

In addition, the Republic of Korea Patent Publication No. 2007-0028677, as shown in Figure 2, the interface unit 10, the control unit 20, the motor driver 30, the switching unit 40, the first reference value setting unit 50 A fuel pump and a driver diagnosis apparatus for an Elpia vehicle including a first comparator 60, a second reference value setting unit 70, a second comparator 80, and an abnormality detection unit 90 are disclosed.

In the configuration shown in FIG. 2, the abnormality detection unit 90 determines that a short or disconnection of a signal line outputting a PWM control signal is applied when the information applied by the first comparator 60 is abnormal or is applied by the second comparator 80. If the information is abnormal, it is determined that the fuel pump has failed, and the control unit 20 outputs a 20 Hz signal as a self-diagnosis code for a short circuit or a disconnection of the signal line, and generates a 10 Hz signal for the failure of the motor driver 30. The present invention discloses a structure that outputs a code and outputs a 15 Hz signal to a self-diagnosis code in response to a failure of the fuel pump.

However, in the technique disclosed in the above-mentioned documents, there is a problem that it is not possible to determine whether the controller is defective or the fuel supply pump is defective when outputting a 10 Hz square wave as a failure diagnosis signal.

In addition, the technique disclosed in the above publication has a problem that the circuit configuration for fault detection in an automobile engine is complicated and the cost for realizing it increases.

An object of the present invention is to solve the problems as described above, by using the self-diagnostic unit of the fuel supply pump controller of the LPG vehicle of the fuel supply pump controller to determine the failure of both components of the fuel supply pump and the controller It is to provide a self-diagnostic device.

Another object of the present invention is to provide a self-diagnosis apparatus of a fuel supply pump controller capable of configuring a fault diagnosis of a fuel supply pump controller and a fuel supply pump of an LPG vehicle with a simple circuit.

In order to achieve the above object, the fuel supply pump controller self-diagnosis apparatus according to the present invention is a diagnostic device for reading a malfunction from an electronic control unit for controlling various functions of a vehicle, the fuel supply pump for supplying fuel to the engine of the vehicle ,

And a controller for controlling the fuel amount of the fuel supply pump and an interface box for outputting a fault diagnosis signal of the controller. The fault diagnosis of the controller and the fault diagnosis of the fuel supply pump are performed using an exclusive logical sum gate of a self-diagnosis unit. It is characterized by.

In addition, in the fuel supply pump controller self-diagnosis apparatus according to the present invention, when the controller and the fuel supply pump is normal, the self-diagnostic unit outputs a frequency of 5Hz, the controller outputs a frequency of 15Hz when the internal abnormality It is done.

In addition, in the fuel supply pump controller self-diagnosis apparatus according to the present invention, when the controller and the fuel supply pump is normal, the self-diagnostic unit outputs a frequency of 5Hz, when the fuel supply pump is abnormal, it outputs an 8Hz frequency It is done.

The above and other objects and novel features of the present invention will become more apparent from the description of the specification and the accompanying drawings.

First, the concept of the present invention will be described.

The present invention is to diagnose the electronic control module and the device mounted on the vehicle to check the presence or failure of the solid state.

Various functions of the vehicle are usually electronically controlled, and this type of vehicle employs an electronic control unit ECU.

ECU is classified into engine control ECU, transmission control ECU and ABS ECU.Each ECU transmits a control signal to control a device connected to the ECU, and the ECU stores data about the control device, and the data is stored. The ECU confirms the diagnosis of the diagnosed vehicle.

EMBODIMENT OF THE INVENTION Hereinafter, the structure of this invention is demonstrated according to drawing.

3 is a block diagram illustrating a self-diagnosis system according to the present invention, FIG. 4 is a self-diagnostic unit embedded in the controller shown in FIG. 3, FIG. 5 is a signal waveform indicating a normal output from the self-diagnostic unit, 6 is a signal waveform showing a failure of the controller output from the self-diagnosis unit, Figure 7 is a signal waveform showing a failure of the fuel supply pump output from the self-diagnosis unit.

The basic configuration of the self-diagnosis system according to the present invention is supplied by using a motor built in the fuel supply pump 200 and the fuel supply pump 200 for directly supplying the liquid LPG fuel to the engine as shown in FIG. The controller 210 and the interface box 220 for outputting a control command to the controller 210 to control the amount of fuel to be output, and outputs a failure diagnosis of the fuel supply pump 200 or the controller 210.

The operation of the self-diagnosis apparatus of the fuel supply pump controller according to the present invention configured as described above will be described.

Power is supplied to the controller 210, the motor of the fuel supply pump 200 is rotated by the driving stage of the controller 210, and the fuel amount is supplied to the engine in proportion to the rotation speed.

The controller 210 compares the vehicle speed signal output from the interface box 220 with the rotation speed of the fuel supply pump and outputs the difference signal as a PWM motor driving signal.

As shown in FIG. 2, the driving stage includes an electronic switch such as an FET or a transistor, and supplies a current to the motor of the fuel supply pump 200 by switching a PWM input signal.

As the current amount increases, the rotation speed of the motor increases, and the fuel supply amount also increases.

The interface box 220 receives the vehicle speed from the ECU and outputs the input signal to the controller 210, and outputs a self-diagnosis signal through a display unit attached to the instrument panel of the vehicle.

According to the present invention, the self-diagnostic unit 230 shown in FIG. 4 is a circuit for determining and outputting which of the controller 210 and the fuel supply pump 200 is a failure, and is embedded in the controller 210. .

The self-diagnosis unit 230 according to the present invention detects the rotation speed of the fuel supply pump 200 when the fuel supply pump 200 is broken, and outputs the detected signal to the second terminal of the exclusive logical sum gate G. Input to the vehicle speed signal output from the interface box 220 to the terminal 1 of the exclusive OR gate G, a fault diagnosis signal is output to the interface box 220 through a plurality of resistors and transistors.

For example, if the vehicle speed signal of terminal 1 of the exclusive OR gate G is HIGH (LOW) and the rotation speed of the fuel supply pump of terminal 2 is LOW (HIGH), the OUTPUT of the self-diagnosis unit 230 is HIGH. When the HIGH signal is used as a start signal, a square wave frequency of 8 Hz as shown in FIG. 7 is generated and output to the interface box 220, indicating that the fuel supply pump is broken.

In addition, when the vehicle speed signal as the terminal 1 of the exclusive OR gate G is HIGH (LOW) and the rotation speed of the fuel supply pump as the terminal 2 is HIGH (LOW), the OUTPUT of the self-diagnosis unit 230 is shown in FIG. It can be seen that the fuel supply pump is normal by outputting a square wave frequency signal of 5 Hz as shown.

Then, the controller 210 compares the input signal and the output signal of the driving stage and if the difference occurs, generates a square wave frequency signal of 15Hz as shown in Figure 6 and outputs to the interface box 220 controller 210 It can be seen that is a malfunction.

In addition, the controller 210 compares the input signal and the output signal of the driving stage, if the difference does not occur, and generates a square wave frequency signal of 5Hz and outputs to the interface box 220 it can be seen that the controller 210 is normal. .

If both the controller and the fuel supply pump are faulty, the square wave of the frequency of 15 Hz and 8 Hz is displayed alternately, and as a code of the display unit, the controller and the fuel supply pump can be configured to indicate that the fault is.

As mentioned above, although the invention made by the present inventor was demonstrated concretely according to the said Example, this invention is not limited to the said Example and can be variously changed in the range which does not deviate from the summary.

As described above, according to the self-diagnosis apparatus of the fuel supply pump controller according to the present invention, the effect of accurately determining which of the controller and the fuel supply pump is faulty is obtained.

In addition, according to the self-diagnostic apparatus of the fuel supply pump controller according to the present invention, the output frequency value is changed to 8 Hz by the same RPM comparison method as the conventional method, and there is a failure of the controller and the fuel supply pump using only one exclusive OR gate. The effect that can be implemented in a simple circuit is obtained.

Claims (3)

In the diagnostic device for reading the malfunction from the electronic control unit for controlling various functions of the vehicle, A fuel supply pump for supplying fuel to the engine of the vehicle, A controller for controlling the fuel amount of the fuel supply pump; Interface box for outputting the fault diagnosis signal of the controller, Self-diagnosis device of the fuel supply pump controller, characterized in that the failure diagnosis of the controller and the fuel supply pump is performed using an exclusive logical sum gate of the self-diagnosis unit. The method of claim 1, The self-diagnosis unit outputs a 5 Hz frequency when the controller and the fuel supply pump are normal, and the controller outputs a 15 Hz frequency when the internal abnormality is abnormal. The method of claim 1, The self-diagnostic apparatus outputs a 5 Hz frequency when the controller and the fuel supply pump are normal, and outputs an 8 Hz frequency when the fuel supply pump is abnormal.

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