KR100270045B1 - Rpm floating prevention method for idling state - Google Patents

Abstract

PURPOSE: A method for preventing floating of rpm is provided to improve convenience and safety for a driver by operating TPS(Throttle Position Sensor) learning control when a specific condition is satisfied and operating general TPS control in other situations. CONSTITUTION: An rpm floating preventing method comprises the steps of: operating TPS learning control when a vehicle is stopped and is in a normal state and operating general TPS control in other situations; operating general TPS control if retardant time period is over a specific value when TPS output is lower than TPS learning value by a difference over a specific value; and controlling a TPS learning value with a TPS filtering value if the retardant time period is over the specific value or operating general TPS control in other situations. Therefore, CTS(Closed Throttle Sensor) is kept in an on state in an idle state and floating of engine rpm is avoided.

Description

How to prevent ALPM floating at idle

The present invention relates to a TPS control method for controlling the TPS when a micro cut-off occurs due to a defective wiring connector of the TPS, and in particular, RPM is rapidly increased in the idle state by stopping TPS learning according to the state of the vehicle. The present invention relates to a method for preventing RPM floating during idle time.

In the conventional TPS control method, as shown in FIG. 1, when the engine is operated, the TPS output checks whether the delay time exceeds a predetermined time (Y) when the TPS output is less than a predetermined amount (X) relative to the TPS learning value. A first step of controlling, and a second step of learning control of the TPS learning value with the TPS filtering value if the delay time exceeds a predetermined time (Y), and otherwise performing normal TPS control.

The conventional TPS control method configured as described above is configured to learn-control TPS according to the TPS filtering value.

When the engine is running, it detects the TPS output and, if the TPS output is less than a certain amount (X) relative to the TPS learning value, checks whether the delay exceeds a certain time (Y). At this time, if the delay time does not exceed the predetermined time Y, normal TPS control is performed. If the delay time exceeds the predetermined time (Y), the TPS filtering value is recognized as the TPS learning value, and TPS filtering control is performed. Otherwise, normal TPS control is performed.

However, in the current vehicle, a micro cut-off in which a closed throttle sensor (CTS) is instantaneously switched from an off state to an on state or from an on state to an off state due to a poor wiring connector on the TPS side. ) May occur. That is, as shown in FIG. 2, when the TPS output is momentarily down ('0 Volt), the CTS is switched from the off state to the on state and then returns to the off state. This micro cut-off phenomenon is mainly generated in a vehicle that does not have an idle switch and determines whether the vehicle is idle by using only a TPS output.

If the micro cut-off occurs, the ignition timing is advanced as the CTS is switched from the on state to the off state, and the idle air amount is increased to cause the driver RPM to float at a high speed.

However, since the conventional TPS control method configured as described above is always performed during driving, the number of occurrences of micro cut-offs is large, and in particular, when driving on a dirt road, the frequency of micro cut-offs is increased due to the vibration of the vehicle. There is a problem that causes a lot of risk.

The present invention has been made to solve the above-described problems of the prior art, by performing the TPS learning control only when a certain condition such as a stop state is satisfied, otherwise by performing the normal TPS control, RPM floating due to TPS control The purpose of the present invention is to provide a method for preventing RPM floating during idle time, which can increase the convenience and safety of the driver.

1 is a flowchart illustrating a conventional TPS control method.

2 is a diagram showing a change in the TPS learning value when the micro cut-off occurs when applying the conventional TPS control method,

Figure 3 is a flow chart illustrating a method for preventing RPM floating during idle according to the present invention,

4 is a diagram showing a change in the TPS learning value when the micro cut-off occurs in the application of the present invention.

<Description of the code | symbol about the principal part of drawing>

Throttle Position Sensor (TPS): Throttle Position Sensor

CTS (Closed Throttle Sensor): Throttle Valve Closed Sensor

X: learning loss constant Y: reference delay time

The present invention provides a first step in which the TPS learning control is performed only when the vehicle is stopped and the current failure is not performed and the normal TPS control is performed while the engine is running, and the TPS output is a predetermined amount or more than the TPS learning value. If it is small, the second step of checking whether the delay time exceeds a predetermined time, otherwise performing the normal TPS control, and if the delay time exceeds the predetermined time, the TPS learning value is controlled by the TPS filtering value, otherwise the normal TPS control is performed. It is characterized by consisting of a third step of carrying out.

Hereinafter, with reference to the accompanying drawings an embodiment of the present invention will be described.

RPM floating prevention method of the present invention is a method of performing the TPS learning control only when the vehicle is stopped and the current is not a failure in the engine operating state, as shown in FIG. Step 1 and the second step of checking whether the delay time exceeds a predetermined time (Y) when the TPS output is smaller than a predetermined amount (X) relative to the TPS learning value, and otherwise performing the normal TPS control, and the delay time is constant. If the time (Y) is exceeded, it consists of a third step of learning control of the TPS learning value with the TPS filtering value, and otherwise performing normal TPS control.

In the idle idle prevention method of the present invention configured as described above, the engine RPM is floating at a high speed even if a micro cut-off occurs by performing the TPS learning control only when the vehicle is under a certain condition. Do not

First, check that the engine is running and check whether it is running. At this time, the TPS learning control is performed only when the vehicle is in a stopped state and is not a current failure. Otherwise, the normal TPS control is performed.

In this case, the TPS filtering value is calculated by comparing the TPS output with the TPS learning value, and if the TPS output is smaller than the predetermined amount (X) by the TPS learning value, check whether the delay time exceeds the predetermined time (Y). Is carried out. If the delay time exceeds a predetermined time (Y), the TPS learning value is learning controlled by the TPS filtering value. Otherwise, the normal TPS control is performed.

Accordingly, as shown in FIG. 4, when the TPS output is changed, the TTS is normally controlled by determining that it is a current failure, and thus the CTS is always kept on, and the ignition timing advance and the increase in idle air volume are prevented according to the conversion of the CTS. This prevents high speed floating of the engine RPM.

As such, the RPM floating prevention method of the present invention performs the TPS learning control only under certain conditions, so that the CTS is always kept on in the idle state, so that the engine RPM floating can be prevented, thereby contributing to the driver's convenience and safety. There is an advantage.

Claims (1)

The first step is to perform TPS learning control only if the vehicle is stationary and not currently broken while the engine is running; otherwise, if the TPS output is less than a certain amount compared to the TPS learning delay, A second step of checking whether the time exceeds a predetermined time and otherwise performing normal TPS control, and if the delay time exceeds a predetermined time, learning control of the TPS learning value with the TPS filtering value, and otherwise performing normal TPS control. RPM floating prevention method during idle, characterized in that consisting of three steps.

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