KR101013972B1 - Electronic throttle valve control method - Google Patents

Abstract

The present invention adjusts the driving duty of the DC motor to operate the throttle valve when noise occurs in the signal of the throttle position sensor for detecting the position of the throttle valve in the electronic throttle valve control device to control the engine stall and engine speed It is to prevent a sudden rise.

The present invention determines the required torque amount to adjust the position of the throttle valve, the process of detecting the TPS1, TPS2 signal and the motor control current for feedback control, calculate the rate of change of the TPS1, TPS2 signal, the rate of change exceeds the set reference value Determining whether the change rate exceeds a reference value and generating noise in the TPS signal, and outputting a high or low control duty of the DC motor for a predetermined time.

ETC, Electronic Throttle Valve, Noise, DC Motor, TPS

Description

Electronic Throttle Valve Control Method {ELECTRONIC THROTTLE VALVE CONTROL METHOD}

The present invention relates to an electronic throttle valve control method (hereinafter referred to as "ETC") applied to a vehicle, and more particularly, to a throttle position sensor for detecting a position of a throttle valve. The present invention relates to an electronic throttle valve control method for preventing a sudden increase in engine stall and engine speed by adjusting a driving duty of a DC motor that operates a throttle valve when noise occurs in a signal.

Recently, the accelerator pedal and the throttle valve are not connected to the cable compared to the mechanical throttle valve, and the opening and closing of the valve is precisely performed by driving the DC motor, so that the ignition timing and fuel injection amount of the engine can be precisely adjusted. The application of the electronic throttle valve control device, which accurately reflects the accuracy, provides a dynamic response of the engine, and provides advantages such as improved fuel economy and improved emissions, is gradually expanding.

The ETC detects the accelerator pedal displacement, which is the driver's willingness, through the accelerator pedal position sensor (APS), and determines the required torque by applying the torque map according to the accelerator pedal displacement, engine speed, coolant temperature, and shift stage conditions. The position of the throttle valve is adjusted by driving a DC motor mounted on the throttle body.

The ETC detects the position of the throttle valve operated by the DC motor through the throttle position sensor to determine whether the throttle valve is controlled to the position corresponding to the torque demand.If it is not controlled to the normal position, the ETC detects the position of the throttle valve. The position of the throttle valve is compensated according to the signal to be controlled to the optimum position.

The throttle position sensor is typically composed of a brush and a resistor. As the position of the throttle valve is changed, the brush connected to the shaft rotates to change the position of the resistor to which the brush is in contact, thereby causing a change in the resistance value. The position of the throttle valve is recognized by recognizing the change in resistance value.

However, since the ETC is mounted on the engine, it is exposed to heat and vibration generated by the combustion of the mixer, so that the contact between the resistor and the brush is unstable and generates noise.

In addition, noise is generated in the signal of the throttle position sensor due to shaking of the shaft portion connecting the throttle position sensor and the throttle valve, abrasion of the contact portion and the brush due to durability.

In addition, noise is generated in the signal of the throttle position sensor due to the inflow of various external electromagnetic waves.

As described above, when noise occurs in the signal of the throttle position sensor due to various causes, the position control of the throttle valve may not be normally executed, resulting in sudden start-up of the engine stall or the engine speed.

Therefore, the ETC uses two throttle position sensors to control the position of the throttle valve more stably, which uses the other throttle valve to maintain the normal state when one throttle position sensor fails. This is to control the position of.

However, even when noise is generated from the signals of two throttle position sensors at the same time, one of the two is regarded as a failure determination and the other one is accepted normally. Therefore, the position control of the throttle valve is not normally executed, and thus, the engine stall or There is a problem of suddenly increasing the rotational speed to cause a sudden start.

For example, when the signals TPS1 and TPS2 of the two throttle position sensors simultaneously come out higher than the normal signal, since | TPS1-TPS2 | = 0, the control means determines that it is normal and controls the position of the throttle valve.

In this case, since the opening is more than the desired throttle valve position, control is executed in the direction of closing the throttle valve to generate an engine stall or a drop of engine speed.

On the contrary, when the signals TPS1 and TPS2 of the two throttle position sensors simultaneously come out lower than the normal signal, since | TPS1-TPS2 | = 0, the control means determines that it is normal and controls the position of the throttle valve.

In this case, the control is executed in the direction of opening the throttle valve because it is less open than the desired position of the throttle valve, causing the engine speed to rise to cause sudden start.

In addition, when the signals TPS1 and TPS2 of the two throttle position sensors are simultaneously higher than the normal signals, and they are different from each other, TPS1-TPS2 is equal to 12, and thus the control means is any one close to the normal signal through the air volume model. The signal is selected and used to control the position of the throttle valve.

At this time, since the signal of the selected throttle position sensor is higher than the actual value, control is executed in the direction of closing the throttle valve to generate an engine stall or an engine speed drop.

In addition, when the signal of one throttle position sensor is higher than the normal signal and the signal of the other throttle position sensor is lower than the normal signal, the control means selects one signal close to the normal value to control the position of the throttle valve. .

At this time, when the signal of the selected throttle valve position sensor is lower than the actual value, the control is executed in the direction of opening the throttle valve to increase the engine speed, causing sudden start, and the control is performed in the direction of closing the throttle valve because it is higher than the actual value. Run to generate an engine stall or engine speed drop.

The present invention has been invented to solve the above problems, the object of which is to drive the duty of the DC motor to operate the throttle valve when the noise occurs simultaneously to the two throttle position sensor signals higher or lower than the normal signal Do not adjust the engine stall or increase the engine speed.

In addition, the failure of the throttle position sensor is determined, the fault code is stored, and the limp home mode is executed.

Electronic throttle valve control method according to the characteristics of the present invention for achieving the above object, the process of detecting the TPS1, TPS2 signal and the motor control current for the feedback control to determine the required torque amount to adjust the position of the throttle valve ; Calculating a rate of change of the TPS1 and TPS2 signals and determining whether the rate of change exceeds a set reference value; When the change rate exceeds the reference value, it is determined that noise is generated in the TPS signal, and the control duty of the DC motor is output to be high or low for a predetermined time.

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According to the above-described configuration, the present invention maintains the position of the throttle valve stably even when simultaneous noise is generated in the signal of the throttle position sensor, thereby preventing the occurrence of sudden increase in engine stall or engine speed, thereby providing stability and reliability in driving of the vehicle. do.

DETAILED DESCRIPTION Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art may easily implement the present invention.

Since the present invention can be implemented in various different forms, the present invention is not limited to the exemplary embodiments described herein, and parts not related to the description are omitted in the drawings in order to clearly describe the present invention.

1 is a view schematically showing an electronic throttle valve control apparatus according to an embodiment of the present invention.

The present invention includes an engine speed detector 10, an accelerator pedal detector 20, a water temperature detector 30, a controller 40, a throttle body 50, and an engine 60.

The engine speed detection unit 10 detects whether the engine speed and the engine are started on from a phase change of the crank shaft or the cam shaft, and applies information about the engine speed to the controller 40.

The accelerator pedal detection unit 20 is an APS. When the accelerator pedal detection unit 20 operates according to a driver's deceleration request, the accelerator pedal detection unit 20 detects a displacement of the accelerator pedal and applies information about the accelerator pedal to the controller 40.

The water temperature detector 30 detects the temperature of the coolant that circulates the radiator and the engine 60 to maintain the engine 60 at an optimal temperature condition, and applies the information to the controller 40.

The controller 40 determines the required torque amount according to the accelerator pedal displacement, the engine speed, the coolant temperature, the shift stage condition, and the like, and adjusts the position of the throttle valve by driving the DC motor 51 mounted on the throttle body 50. do.

The controller 40 detects the position of the throttle valve opened and closed by the DC motor 51 through the output signals TPS1 and TPS2 of the first and second throttle position sensors 52 and 53 to detect the position of the throttle valve. It is determined whether is controlled to correspond to the torque demand and control to the normal position.

The controller 30 analyzes the rate of change △ of the signals TPS1 and TPS2 output from the first and second throttle position sensors 52 and 53, and when the rate of change Δ exceeds the set normal signal (reference value). It is determined that noise is generated simultaneously with the signals TPS1 and TPS2 output from the first and second throttle position sensors 52 and 53, and a diagnostic code is output according to the noise determination. Operation is controlled to prevent engine stalls or sudden increases in engine speed.

When simultaneous noise is detected in the signals TPS1 and TPS2 of the first and second throttle position sensors 52 and 53, a diagnostic code DTC is output and the device enters the lymph home mode.

For example, when entering the limp home mode, the maximum engine speed is maintained at 2,500 RPM or less, and the maximum vehicle speed is maintained at 80 km / h or less.

The control unit 30 adjusts the position of the throttle valve when the signals TPS1 and TPS2 of the first and second throttle position sensors 52 and 53 are simultaneously higher than the normal signal (reference value). ), The driving duty of the motor is controlled to be high for a certain period of time so that no engine stall or engine speed drop occurs.

In addition, in the opposite case, the driving duty of the DC motor is controlled low for a predetermined time so that a sudden increase in the engine speed is not generated.

The throttle body 50 includes a throttle valve, which is operated according to a control signal of the controller 40 to change the position of the throttle valve, and the throttle valve changes according to the operation of the DC motor 51. First and second throttle position sensors 52 and 53 are provided to the control unit 40 for detecting the position of the.

The engine 50 generates power in accordance with the position of the throttle valve.

Operation of controlling the position of the throttle valve in the present invention that includes the function as described above is as follows.

When the engine is started, the controller 40 detects and analyzes general vehicle information including the engine speed and the acceleration pedal displacement, which is the driver's deceleration demand, the temperature of the coolant, the gear shift stage, and determines the required torque amount. The DC motor 51 mounted to the throttle body 50 is driven to adjust the position of the throttle valve (S101).

Determine whether the general information of the vehicle satisfies the engine control condition according to the noise generation of the throttle position sensor signal in a state in which the output of the engine 60 is secured by controlling the position of the throttle valve according to the driving request and the vehicle information as described above. (S102).

The engine control condition is that the engine is turned on, the coolant temperature is higher than the set reference temperature, the failure of the first and second throttle position sensors 52, 53 does not occur.

When the engine control condition is satisfied in S102, the controller 40 detects the signals TPS1 and TPS2 of the first and second throttle position sensors 52 and 53 applied as a feedback signal (S103), and the DC motor 51 Control current is detected (S104).

Then, the rate of change Δ of the signals TPS1 and TPS2 detected by the first and second throttle position sensors 52 and 53 is calculated (S105), and the rate of change Δ is greater than the set normal signal (reference value). It is determined whether or not the state is large (S106).

If the change rate Δ is greater than the set normal signal (reference value) in S106, simultaneous noise is generated in the signals TPS1 and TPS2 of the first and second throttle position sensors 52 and 53, thereby causing abnormality in ETC control. In order to prevent the engine stall from occurring after the diagnosis, the control duty of the DC motor 51 is controlled to be high for a predetermined time to prevent the sudden rise of the engine stall or the engine speed (S107).

When the number of occurrences of the above operation is accumulated and repeated more than the set number of times, the apparatus enters the lymph groove mode and maintains the maximum engine speed at 2,500 RPM or less and maintains the maximum vehicle speed at 80 km / h or less.

As shown in FIG. 3, the rate of change Δ of the signals TPS1 and TPS2 detected by the first and second throttle position sensors 52 and 53 is higher than the set reference voltage V_ref, and the number of times is more than a predetermined number of times. If it repeats, it outputs a fault code and enters Lymph Home mode.

Although the embodiments of the present invention have been described in detail above, the scope of the present invention is not limited thereto, and various modifications and improvements of those skilled in the art using the basic concepts of the present invention defined in the following claims are also provided. It is included in the scope of rights.

1 is a view showing a schematic configuration of an electronic throttle valve control apparatus according to an embodiment of the present invention.

2 is a view showing a control procedure of the electronic throttle valve control apparatus according to an embodiment of the present invention.

3 is a diagram illustrating an output and a voltage relationship of a throttle position sensor according to an exemplary embodiment of the present invention.

<Explanation of symbols for the main parts of the drawings>

10: engine speed detection unit 20: accelerator pedal detection unit

30: water temperature detection unit 40: control unit

50: throttle body 51: DC motor

52: first throttle position sensor 53: second throttle position sensor

Claims (6)

delete delete delete delete Determining the required torque to adjust the position of the throttle valve and detecting the TPS1, TPS2 signals and the motor control current for feedback control; Calculating a rate of change of the TPS1 and TPS2 signals and determining whether the rate of change exceeds a set reference value; Determining that noise is generated in the TPS signal when the rate of change exceeds a reference value, and outputting a high or low control duty of the DC motor for a predetermined time; Electronic throttle valve control method comprising a. The method of claim 5, And if the number of times that the rate of change of the TPS1, TPS2 signals exceeds a reference value is a set number of times, enters the limp home mode and performs torque limit control.

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