KR20050052777A - A method of engine stability using actual measurement value of mass air flow sensor and chattering detection logic of throttle position sensor signal - Google Patents

Abstract

The present invention provides a method for implementing engine stability when a throttle position sensor (TPS) signal is momentarily disconnected. The method includes checking whether the throttle position sensor (TPS) and the air volume sensor (MAF) are normal and below a predetermined speed of the engine speed. ; Determining the instantaneous breaking of the TPS signal when two conditions are satisfied as a result of the checking in the above step; As a result of the determination in the above step, entering a fault home mode when a momentary disconnection of the TPS signal occurs; Calculating a fuel injection amount as an air quantity actual value of a mass air flow (MAF) sensor after entering the failure mode; And a normal injection step of the fuel.

Description

{A method of engine stability using actual measurement value of mass air flow sensor and chattering detection logic of throttle position sensor signal}

The present invention relates to a method for realizing engine stability using the throttle position sensor signal instantaneous disconnection determination and air quantity measurement value, and more specifically, the instantaneous disconnection of the throttle position sensor (TPS) is determined by logic in the ECU. In the event of a disconnection, the throttle position sensor signal instantaneous breakage determination and engine stability measurement using the air volume measurement value to ensure the stability of the engine by injecting fuel using the air quantity actual value through the MAF (Mass Air Flow) sensor It is about.

In general, the TPS signal is converted into a value close to 5V through the pull-up circuit when the disconnected signal, which is instantaneously disconnected due to the vibration of the connector, is input to the ECU. In other words, in case of disconnection instead of instantaneous disconnection, it is possible to discriminate a false signal through the Rationality Check. However, in case of an instantaneous disconnection, the signal conformity discrimination condition is not satisfied (that is, the operation of signal conformity discrimination logic). It is impossible to detect a short circuit due to the time lapse for determining the condition.

Therefore, the fuel injection amount is calculated according to the corresponding air quantity model value (value calculated using the TPS signal) on the basis of the false signal of the TPS, so that the mixture can be combusted by the rich injection amount which does not match the actual air amount. Beyond this problem occurs that the engine is stopped.

Accordingly, the applicant of the present invention is to propose the present invention to feel the need to secure the stability of the engine by determining the instantaneous disconnection for the TPS signal.

The present invention has been made to solve the problems of the prior art, an object of the present invention is to determine the instantaneous disconnection (chattering) of the throttle position sensor (TPS) by the logic in the ECU, when the momentary disconnection occurs MAF (Mass) The present invention provides a method for realizing engine throttle using a throttle position sensor signal instantaneous breakage determination and an air flow measurement value to ensure engine stability by injecting fuel using an air flow sensor.

In order to achieve the above object, the engine stability implementation method according to the present invention

Checking whether the throttle position sensor TPS and the air mass sensor MAF are normal and the engine speed is equal to or less than a predetermined speed;

Determining the instantaneous breaking of the TPS signal when two conditions are satisfied as a result of the checking in the above step;

As a result of the determination in the above step, entering a fault home mode when a momentary disconnection of the TPS signal occurs;

Calculating a fuel injection amount as an air quantity actual value of a mass air flow (MAF) sensor after entering the failure mode; And

It consists of a normal injection stage of fuel.

The present invention determines the instantaneous break (chattering) of the throttle position sensor (TPS) by the logic in the ECU, when the instantaneous break occurs, the normal fuel injection is made by using the air quantity actual value through the MAF (Mass Air Flow) sensor This is a method of realizing engine stability using the throttle position sensor signal instantaneous disconnection and air volume measurement value to ensure engine stability.

Hereinafter, with reference to the drawings will be described a preferred embodiment according to the present invention.

<Example>

Configuration

FIG. 1 illustrates a concept in which fuel injection of a normal engine is performed by discriminating by instantaneous disconnection detection logic in the ECU at the momentary disconnection of the TPS signal according to the present invention.

As shown in FIG. 1, in the present invention, when the TPS is disconnected by the instantaneous break detection logic of the ECU, when the instantaneous break of the TPS signal occurs, the measured amount of air through the MAF sensor is used. The fuel injection amount was calculated so that normal fuel injection was achieved. Therefore, it is possible to prevent the problem that the start is not turned off because the conventional fuel injection is not made.

Way

An exemplary embodiment of the engine stability during instantaneous disconnection of a TPS signal according to an embodiment of the present invention will be described with reference to FIG. 1 with reference to FIG. 2.

As shown in Fig. 2, first, the following prerequisites must be satisfied for the logic according to the present invention to operate.

First, the throttle position sensor TPS and the air mass sensor MAF should be normal [S10].

Second, the engine speed should be below a certain speed. That is, the idle state (idle) must be [S20].

As a result of checking in steps S10 to S20, when the condition is satisfied, an instantaneous disconnection of the TPS signal is determined by the ECU [S30]. The instantaneous disconnection detection method of the TPS signal according to the present invention is the flowchart shown in FIG. 3.

As shown in FIG. 3, first, whether a short break occurs under a predetermined time of the TPS signal is determined first to determine a short break of the TPS signal according to the present invention [S100].

In the step S100, it is determined whether the instantaneous disconnection occurred more than a predetermined number of times within a predetermined time when the instantaneous disconnection occurs [S200]. If the condition of step S200 is not satisfied, it is not determined that an instantaneous disconnection occurs [S300]. However, as a result of the determination in step S200, when the generated instantaneous disconnection occurs more than a certain number of times within a predetermined time, it is determined that the instantaneous disconnection occurs in the TPS signal [S400].

Returning to the flowchart of FIG. 2 again, when the momentary disconnection of the TPS signal occurs as a result of the determination in step S30, the ECU enters a fault home mode [S40] and measures the air volume of the MAF (Mass Air Flow) sensor. The fuel injection amount is calculated using the value [S50], so that the normal fuel injection can be made [S60].

As described above, in the present invention, the instantaneous breakage is determined by the instantaneous breakage detection logic in the ECU when the momentary breakdown of the TPS signal is performed, and when the instantaneous breakage of the TPS signal occurs, the air quantity measured through the MAF sensor is measured. The fuel injection amount is calculated so that normal fuel injection can be achieved to realize engine stability.

Although the present invention has been described above with reference to preferred embodiments, the technical spirit of the present invention should not be construed as being limited thereto, and the technical scope according to the present invention should be determined by reasonable interpretation of the matters described in the claims. .

The effects according to the engine stability implementation method using the throttle position sensor signal instantaneous disconnection determination and air volume actual measurement value of the present invention are as follows.

First, there is an effect that can ensure the stability of the engine operation for the momentary break of the TPS signal.

Second, since the engine stop situation can be prevented, the driver's driving convenience is improved.

1 is a conceptual diagram of fuel injection amount calculation in an ECU during instantaneous disconnection of a TPS signal according to the present invention;

2 is a flowchart illustrating an implementation of engine stability during a momentary disconnection of a TPS signal according to the present invention;

3 is a flow chart determination flow chart of the TPS signal according to the present invention.

Claims (2)

A method of implementing engine stability in case of a momentary disconnection of a throttle position sensor (TPS) signal, Checking whether the throttle position sensor TPS and the air mass sensor MAF are normal and the engine speed is equal to or less than a predetermined speed; Determining the instantaneous breaking of the TPS signal when two conditions are satisfied as a result of the checking in the above step; As a result of the determination in the above step, entering a fault home mode when a momentary disconnection of the TPS signal occurs; Calculating a fuel injection amount as an air quantity actual value of a mass air flow (MAF) sensor after entering the failure mode; And A method for implementing engine stability using a throttle position sensor signal instantaneous breakage determination and air quantity actual value characterized in that the normal injection phase of the fuel. The method of claim 1, wherein the instantaneous disconnection determination method of the TPS signal Determining whether a momentary break occurs within a predetermined time of the TPS signal; Determining whether the instantaneous disconnection occurs more than a predetermined number of times within a predetermined time when the instantaneous disconnection occurs in the step; And Determination of the momentary disconnection of the TPS signal when the momentary disconnection occurs more than a certain number of times within a predetermined time, and the engine stability realization method using the throttle position sensor signal instantaneous disconnection determination and air volume actual measurement value .