KR100534792B1 - Throttle position sensor drift prevention device - Google Patents

Abstract

The present invention relates to a throttle position sensor drift prevention control method that can reduce after-sales service for the same problem by determining the distortion of a signal input from the throttle position sensor when a throttle position sensor contact failure occurs. Detecting; Detecting that the signal of the throttle position sensor is distorted when the vehicle is stopped; When the signal of the throttle position sensor is distorted, the difference between the intake flow rate and the mapped air amount according to the opening angle of the throttle position sensor is compared with the set value, and when the air amount difference is more than the set value, the dummy throttle position sensor (DUMMY) Determining a value of TPS) and performing a control operation to prevent an engine speed increase along the target engine speed.

Description

Throttle position sensor drift prevention control method {THROTTLE POSITION SENSOR DRIFT PREVENTION DEVICE}

The present invention relates to a throttle position sensor drift prevention control method.

In general, when the signal of the throttle position sensor TPS is distorted, the engine control unit ECU does not determine the distortion of the signal input from the throttle position sensor, thereby increasing the engine speed rpm.

When using the above method, in the related art, a claim is generated in a field by providing anxiety due to an increase in engine speed.

In addition, since it is difficult to reproduce the distortion phenomenon of the throttle position sensor signal, even after service (A / S), there is a problem that causes continuous customer dissatisfaction because only the replacement or cleaning of related parts is performed.

An object of the present invention is to provide a throttle position sensor drift prevention control method that can reduce the after-sales service for the same problem by determining the distortion of the signal input from the throttle position sensor when a throttle position sensor contact failure phenomenon occurs.

In order to achieve the above object, the present invention provides a control method for preventing a throttle position sensor drift, comprising: detecting a vehicle stop state; Detecting that the signal of the throttle position sensor is distorted when the vehicle is stopped; When the signal of the throttle position sensor is distorted, the difference between the intake flow rate and the mapped air amount according to the opening angle of the throttle position sensor is compared with the set value, and when the air amount difference is more than the set value, the dummy throttle position sensor (DUMMY) Determining a value of TPS) and performing a control operation to prevent an engine speed increase along the target engine speed.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. While many specific details, such as the following description and the annexed drawings, are shown to provide a more general understanding of the invention, these specific details are illustrated for the purpose of explanation of the invention and are not meant to limit the invention thereto. And a detailed description of known functions and configurations that may unnecessarily obscure the subject matter of the present invention will be omitted.

A throttle position sensor drift prevention control method according to an exemplary embodiment of the present invention will be described with reference to FIG. 1.

First, a control device for performing a throttle position sensor drift prevention control operation according to an embodiment of the present invention includes a vehicle speed sensor, an idle detection sensor, a throttle position sensor, an intake flow rate detection sensor, and an engine control unit (ECU).

Referring to FIG. 1, the engine controller detects a vehicle stop state by analyzing a signal input from a vehicle speed sensor in S110.

If the vehicle is in a stopped state, the engine controller proceeds to step S112 to detect an off idle state.

If the vehicle is not in the off idle state in the stopped state (vehicle speed = 0), the engine controller proceeds to step S114 to analyze the signal input from the throttle position sensor and compares the magnitude of the throttle position sensor opening value and the idle detection threshold value. do.

If the throttle position sensor opening value is larger than the idle detection threshold in step S114, the engine controller determines that the engine is off idle (S116).

The flow advances to step S118 to detect whether the change rate of the throttle opening degree is equal to or greater than a predetermined value.

If the change rate of the throttle opening degree is not greater than or equal to a predetermined value, the engine controller proceeds to step S120 to detect whether the change rate of the throttle opening degree is constant for a predetermined time or less.

If the change rate of the throttle opening degree is constant for a predetermined time or less, the engine controller proceeds to step S122 and compares the difference between the model value and the actual value of the engine load and the magnitude of the engine load threshold.

Here, when the difference value of the engine load is larger than the engine load threshold value, the engine control unit determines the dummy throttle position sensor Dummy TPS and performs an idle control operation to forcibly follow the target idle rotation speed (S124 and S126).

If the change rate of the throttle opening degree is greater than or equal to a predetermined value in the above-described S118, the engine controller cancels the determination of the dummy throttle position sensor without performing the dummy throttle position sensor and performs the control operation of the off-idling state (S128 to S132). ).

On the other hand, when the vehicle is stopped and in the off-idle state, the engine control unit stops the adaptation that learns the secondary load (Model value) calculated value as the main load value (the value obtained from the HFM or MAP) and throttles the engine. Due to the position sensor drift (TPS Drift), a control operation for preventing the correction value from being learned to a value smaller than the reference correction value 1 is performed (S134 to S138).

In accordance with such a control operation, the root cause of the engine speed increase can be eliminated by preventing the idle speed actuator ISA from proceeding continuously in the opening direction.

As described above, in the embodiment of the present invention, when the signal of the throttle position sensor is distorted, that is, the throttle position sensor signal value accepted by the idle state or the engine control unit ECU is not idle, the engine speed If the difference between the amount of air coming through the intake air flow sensor (HFM) and the mapped amount of air according to the opening angle of the throttle position sensor differs by more than a reference value, the dummy throttle position sensor (DUMMY TPS) The value is determined by the engine controller to be controlled according to the target engine speed.

That is, the logic according to the embodiment of the present invention prevents an increase in the engine speed when the throttle position sensor signal is distorted and input to the engine controller while the vehicle speed is "0".

When the vehicle speed is "0", when the throttle position sensor opening degree is larger than the reference value for detecting the idle, it is determined as off idle.However, if the rate of change of the throttle opening degree is not over a certain value, that is, there is almost no change rate for a certain time. When the dummy throttle position sensor is determined, a condition is entered.

When the driver drives, the rate of change of the throttle position sensor opening degree is greater than or equal to a certain value, so that the driver operates in the off-idle state without determining by the dummy throttle position sensor.

When the condition to be determined by the dummy throttle position sensor is reached, the difference between the model value and the actual value of the engine load is compared, and when the model value of the load is larger than the actual value, the dummy throttle position sensor is determined and the target idle is forced. Logic is activated to track the revolutions.

In the case of determining off-idle when the vehicle speed is "0", the engine load learning must be stopped accordingly.

This is because when the engine load learning is performed, the correction value is less than 1 due to the throttle position sensor drift. Accordingly, the engine speed continues to increase as the engine speed continues to open the idle speed actuator.

As described above, the throttle position sensor drift prevention control method according to the present invention reduces the after-sales service for the same problem even if the throttle position sensor contact failure occurs intermittently, and the driver's driving feeling that may occur in the field. There is an effect that can reduce the effect on.

1 is a flow chart illustrating a throttle position sensor drift prevention control method according to an embodiment of the present invention.

Claims (4)

When the signal of the throttle position sensor is detected to be distorted while the vehicle is stopped, the difference between the intake flow rate and the mapped air amount according to the opening angle of the throttle position sensor is compared with the set value. A throttle position sensor drift prevention control method for controlling an engine speed increase along a target engine speed by determining a sensor (DUMMY TPS) value, Comparing the magnitude of the throttle position sensor opening value and the idle detection threshold if the vehicle is not in the off idle state; Determining off throttle if the throttle position sensor opening value is greater than a magnitude of an idle detection threshold; Detecting whether the change rate of the throttle opening degree is equal to or greater than a predetermined value; Detecting whether the change rate of the throttle opening degree is constant for a predetermined time or less; Comparing the difference between the model value and the actual value of the engine load and the magnitude of the engine load threshold value when the change rate of the throttle opening degree is equal to or less than a predetermined value; If the difference value of the engine load is greater than the engine load threshold, determining the dummy throttle position sensor (Dummy TPS) and performing an idle control operation to forcibly follow the target idle rotation speed. Prevention control method. delete The throttle position sensor according to claim 1, wherein if the change rate of the throttle opening degree is equal to or greater than a predetermined value, the determination made by the dummy throttle position sensor is canceled without performing the dummy throttle position sensor determination, and the control operation of the off-idling state is performed. How to control drift. 2. The method of claim 1, wherein, when the vehicle is stopped and in the off-idling state, the adaptation of learning the secondary load (Model value) calculated value to the main load value (the value obtained from the HFM or MAP) is stopped. A method for preventing throttle position sensor drift, further comprising preventing the correction value from being learned to be smaller than the reference correction value due to throttle position sensor drift.