KR20150057534A - Apparatus for controlling drive away release in electronic parking brake system and method thereof - Google Patents

Abstract

In the present invention, disclosed are an apparatus for controlling drive away release in an electronic parking brake system and a method thereof. According to the present invention, the apparatus for controlling drive away release in an electronic parking brake system comprises: a neutral switch detecting a neutral state of a manual transmission; an acceleration pedal sensor detecting an operating state of an acceleration pedal; an engine RPM sensor measuring the number of rotation of an engine; a vehicle speed sensor measuring speed of a vehicle; an EPB driving unit electronically operating and releasing a parking brake; and a control unit automatically releasing an EPB by controlling the EPB driving unit in case a state of a vehicle reaches a transmission point in an EPB locking state after learning a transmission point of a manual transmission through the neutral switch, the acceleration pedal sensor, the engine RPM sensor, and the vehicle speed sensor.

Description

TECHNICAL FIELD [0001] The present invention relates to an electronic parking brake system, and more particularly,

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to an apparatus and method for controlling an electronic parking brake system, and more particularly, to a system and method for controlling an electronic parking brake system using a DAR (Drive Away Release) The present invention relates to a digital control system for an electronic parking brake system that performs a DAR function by learning a shift point of a manual transmission on the basis of a dynamic behavior of a vehicle when performing an automatic parking brake system.

Generally, the brake system has a parking brake, called a normal hand brake or side brake, which keeps the vehicle stationary. The parking brake is operated as the driver operates the parking lever provided on the driver's seat inside the vehicle. When the driver pulls the parking lever, the cable connected to the cable is pulled so that the rear wheel brake assembly connected to the cable is maintained in an activated state to secure the braking force. On the contrary, if the parking lever is released, the cable is released and the braking force is released.

Since the operation of the parking brake according to the operation of the parking lever is operated only by the driver's operation, when the vehicle is parked without pulling the parking lever inadvertently by the driver, the vehicle rolls down on the ramp to cause an unexpected accident There is a problem. In addition, since the driver has to operate the parking lever at the time of parking or each time the vehicle is started, the use of the parking lever is very troublesome.

Accordingly, an electronic parking brake (hereinafter referred to as EPB) for electronically controlling the operation of the parking brake has been developed to solve such a problem. The EPB is a system that automatically applies and releases the parking brake through a simple switch operation. Even if the driver does not operate the parking brake manually, the vehicle may be pushed back when the vehicle is stopped or when the ramp starts. , It automatically operates and keeps the vehicle parked or stopped.

This EPB system provides various functions such as emergency braking and automatic stopping of parking brake when the engine is stopped and anti-skidding in the ramp. When the parking brake is applied and the accelerator pedal is depressed, the parking brake is automatically released (DAR) function.

The DAR function automatically releases the parking brake when the vehicle is equipped with an EPB and the parking brake is applied only after the parking brake has been applied. Provides the ability to operate.

The background art of the present invention is disclosed in Korean Patent Laid-Open Publication No. 2012-0111039 (published on October 10, 2012, entitled "DIAAL CONTROL METHOD OF ELECTRIC PARKING BRAKE SYSTEM").

In this way, the DAR function of the electronic parking brake system automatically shifts the EPB from the locked state when the vehicle is stopped and the gear is shifted from the neutral to the drivable stage and the accelerator pedal is depressed to start the vehicle.

At this time, in the case of a vehicle equipped with a manual transmission, the clutch sensor signal is monitored to determine the driver's starting point and the state of the vehicle, thereby performing the DAR function.

The clutch of the manual transmission is a device that transmits the power of the engine by using friction force. It consists of a pressure plate (clutch plate) and a clutch disc (clutch disc), and a slip occurs every moment when the power is transmitted, Structure.

At this time, the clutch sensor measures the separation distance between the rotation axis of the engine and the clutch disk connected to the transmission, and outputs the measured output voltage value.

Therefore, when the value of the clutch sensor is not referred to when the DAR function is implemented in a vehicle equipped with a manual transmission, when the driver moves the transmission gear to the runnable state while depressing the brake and clutch for starting, As the DAR function is activated and the EPB is automatically released, the vehicle is pushed back and the risk of accidents arises.

In this way, EPB is operated based on the clutch sensor to automatically release the EPB when the vehicle reaches a certain clutch distance that can not be transmitted even by the ramp. .

However, in order to implement the DAR function in a vehicle equipped with a manual transmission, an additional clutch sensor must be additionally installed, which causes additional component costs and also increases assembling time.

SUMMARY OF THE INVENTION The present invention has been made in order to solve the above-mentioned problems, and an object of the present invention is to provide a vehicle equipped with a manual transmission, which is capable of performing a DAR (Drive Away Release) The present invention provides a DIA control apparatus and a control method thereof for an electronic parking brake system that performs a DAR function by learning shift points of a manual transmission based on a dynamic behavior of a vehicle.

According to an aspect of the present invention, a DIA control apparatus for an electronic parking brake system includes: a neutral switch for sensing a neutral state of a manual transmission; An accelerator pedal sensor for detecting an operating state of the accelerator pedal; An engine RPM sensor for measuring engine speed; A vehicle speed sensor for measuring the speed of the vehicle; An EPB driver for electronically actuating and releasing the parking brake; And a control unit which automatically learns the shifting point of the manual transmission through the neutral switch, the accelerator pedal sensor, the engine RPM sensor and the vehicle speed sensor, and then controls the EPB driving unit to automatically release the EPB when the state of the vehicle reaches the shifting point in the EPB locked state ; And

The present invention is characterized by further comprising an inclination sensor for measuring the inclination of the vehicle.

In the present invention, the control unit corrects the shift point according to the inclination measured by the inclination sensor, thereby automatically releasing the EPB.

In the present invention, the shift point is the opening degree of the accelerator pedal and the engine speed at the point of time when the accelerator pedal is operated in the state in which the neutral switch is popular and the upward inflection point of the engine speed and the vehicle speed are generated.

According to another aspect of the present invention, there is provided a method of controlling an electronic parking brake system, the method comprising: determining a popularity status of a neutral switch in an EPB locked state; Determining an operating state of the accelerator pedal when the control unit is in a popular state; Determining whether a shift point is reached by inputting an engine RPM and a vehicle speed after the accelerator pedal is operated; And releasing the EPB when the control unit determines that the shift point has been reached and reaches the shift point.

Determining whether a vehicle speed has been reached when the control unit determines that a shift point has been reached and has not reached a shift point;

The control unit may further include a step of determining an occurrence of a vehicle speed, correcting a shift point learning value when a vehicle speed is generated, and releasing the EPB.

In the present invention, the step of determining whether or not the shift point has been reached may further include the step of receiving the inclination from the inclination sensor and correcting the shift point according to the inclination.

In the present invention, the shift point is characterized in that the controller learns the opening degree and the engine speed of the accelerator pedal at the time when the accelerator pedal is operated in the state of popularity of the neutral switch and the upward inflection point of the engine speed and the vehicle speed are generated .

The DIA control device and the control method of the electronic parking brake system according to the present invention can be applied to a vehicle equipped with a manual transmission, in which the shift point of the manual transmission is changed based on the dynamic behavior of the vehicle when performing the DAR function of the electronic parking brake By learning and performing the DAR function, the clutch sensor can be eliminated from a vehicle equipped with a manual transmission, thereby reducing component costs and shortening the time required for component assembly.

FIG. 1 is a block diagram illustrating a DIA control apparatus of an electronic parking brake system according to an embodiment of the present invention. Referring to FIG.
2 is a graph showing the dynamic behavior of a vehicle for learning a shift point in a DIA control system of an electronic parking brake system according to an embodiment of the present invention.
FIG. 3 is a flowchart illustrating a method for controlling a DIAL of an electronic parking brake system according to an embodiment of the present invention. Referring to FIG.
4 is a flowchart illustrating a shift point learning process in the DIA control method of the electronic parking brake system according to the embodiment of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a DIA control apparatus and a control method thereof for an electronic parking brake system according to an embodiment of the present invention will be described with reference to the accompanying drawings. In this process, the thicknesses of the lines and the sizes of the components shown in the drawings may be exaggerated for clarity and convenience of explanation.

In addition, the terms described below are defined in consideration of the functions of the present invention, which may vary depending on the intention or custom of the user, the operator. Therefore, definitions of these terms should be made based on the contents throughout this specification.

FIG. 1 is a block diagram showing a DIA control system of an electronic parking brake system according to an embodiment of the present invention. FIG. 2 is a block diagram showing the configuration of a shift control point in a DIA control system of an electronic parking brake system according to an embodiment of the present invention. A graph showing the dynamic behavior of a vehicle for learning.

1, the DIA control apparatus of an electronic parking brake system according to an embodiment of the present invention includes a neutral switch 10, an accelerator pedal sensor 20, an engine RPM sensor 30, a vehicle speed sensor 40 ), An EPB driving unit 70, a control unit 60, and an inclination sensor 50.

The neutral switch 10 senses and outputs a neutral state of the manual transmission (not shown) and a state shifted to the travelable stage.

The accelerator pedal sensor 20 senses the operating state in which the driver depresses the accelerator pedal (not shown) and the opening of the accelerator pedal.

The engine RPM sensor 30 measures the engine speed.

The vehicle speed sensor 40 measures the speed of the vehicle to determine the motion state of the vehicle.

The EPB driver 70 activates and deactivates the electronic frequency braking system.

The control unit 60 learns the shift point of the manual transmission through the neutral switch 10, the accelerator pedal sensor 20, the engine RPM sensor 30 and the vehicle speed sensor 40, Point, the EPB driving unit 70 is controlled to automatically release the EPB.

The shifting point can be set through the dynamic behavior relationship of the vehicle as shown in FIG.

In the initial stop state of the vehicle equipped with the manual transmission, the neutral switch 10 is in the neutral state and the clutch is in the inoperative state. In such a situation, the gear box (not shown) is in a non-engaged state, and the engine speed is independent of the input / output speed of the gear box. The output speed of the gear box is obtained by the relationship between the engine speed and the gear ratio in a normal running situation in which the gear box is engaged and the vehicle is driven by the engine. In this state, when the clutch is shifted to the travelable state and the neutral switch is turned off, the clutch is in a non-operating state.

When the driver then attempts to connect the clutch disc (not shown) and the engine output portion (not shown) using the half-clutch, the engine speed is slightly reduced, but the engine output rises by operating the accelerator pedal.

Accordingly, the shifting point at which the shifting is completed is the point at which the vehicle speed is actually generated, that is, the point at which the upward inflection point of the engine speed and the vehicle speed are generated.

The control unit 60 learns the engine speed and the opening degree of the accelerator pedal at this shift point, determines the state of the vehicle in the EPB lock state, and automatically releases the EPB when reaching the shift point.

The inclination sensor 50 measures the inclination of the vehicle.

Therefore, when the vehicle is parked on the ramp, the control unit 60 may delay the EPB release time according to the inclination input from the inclination sensor 50 because the vehicle is pushed when the EPB is released under the same conditions as in the flat road, And corrects the shifting point so that it can start safely even when the inclination is high.

As described above, according to the DIA control apparatus of the electronic parking brake system according to the present invention, when the DAR function of the electronic parking brake is performed in the vehicle equipped with the manual transmission, based on the dynamic behavior of the vehicle, By learning the shift points and performing the DAR function, the clutch sensor can be eliminated from the vehicle equipped with the manual transmission, thereby reducing the component cost and shortening the time required for component assembly.

FIG. 3 is a flowchart for explaining a method of controlling the electronic control system of an electronic parking brake system according to an embodiment of the present invention. FIG. 4 is a flowchart illustrating a method of controlling an electronic parking brake system according to an embodiment of the present invention. A flow chart for explaining the learning process.

3, in the DIA control method of the electronic parking brake system according to the embodiment of the present invention, the control unit 60 determines the popularity state of the neutral switch 10 in the EPB locked state (S10) .

The DAR function is a function of automatically releasing the EPB lock state, that is, in a state in which the electronic parking brake is operated, and the diesel control method is performed by the control unit 60 in the EPB locked state.

Also, the control unit 60 determines whether the neutral switch is in the neutral state for determining the vehicle departure intention of the driver in the EPB locked state, and the neutral switch is turned off in the first stage or the R stage, which is a travelable stage.

Therefore, if it is not the EPB lock state and is not the popular word state in step S10, the digital control is ended.

Thereafter, the control unit 60 determines the operating state of the accelerator pedal in the popular state (S20).

That is, it is judged whether or not the driver has operated the accelerator pedal to start after shifting the gear to the travelable stage.

At this time, if the accelerator pedal is not operated, the control unit 60 returns to the step S10 to determine the popularity state.

However, when the accelerator pedal is operated, the control unit 60 receives the inclination of the vehicle and corrects the shift point according to the inclination (S30).

This is because if the vehicle is parked in a ramp, the EPB is released when the EPB is released under the same conditions as in the flat road, and therefore the vehicle is pushed, so that the EPB release point is advanced or delayed depending on the inclination input from the tilt sensor 50 It is possible to start safely even when the slope is high.

The control unit 60 receives the engine speed to determine whether the shift point has been reached (S40).

Thereafter, the control unit 60 determines whether the shift point has reached the shift point based on the opening of the accelerator pedal and the engine speed (S50).

If it is determined that the control unit 60 has reached the shift point, the EPB driving unit 70 is operated to release the EPB (S80).

However, it is determined in step S50 whether the control unit 60 has reached the shift point, and it is determined whether the vehicle speed is generated in a state where the shift point has not been reached (S60).

In this situation, the EPB is not released because the control unit 60 does not reach the learned shift point, but the EPB is released with the vehicle moving (S80).

When the EPB is released due to the vehicle movement without reaching the shift point, the driver can sense the discomfort of the vehicle. Therefore, the shift point learning value is corrected. When performing the DAR function after that, So that the EPB can be released (S70).

4, the control unit 60 determines the popularity state of the neutral switch 10 (S91), determines the operating state of the accelerator pedal (S92), and determines the rising inflection point (S93), determines whether a vehicle speed has occurred, and determines a shift point (S94).

That is, the point of time when the upward inflection point of the engine speed occurs and the vehicle speed is generated is determined as the shift point, and the opening degree of the accelerator pedal and the engine speed at this time point are set to the shift point As a learning value (S95).

As described above, according to the DIA control method of the electronic parking brake system according to the present invention, when the DAR function of the electronic parking brake is performed in the vehicle equipped with the manual transmission, based on the dynamic behavior of the vehicle, By learning the shift points and performing the DAR function, the clutch sensor can be eliminated from the vehicle equipped with the manual transmission, thereby reducing the component cost and shortening the time required for component assembly.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it will be understood by those of ordinary skill in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims. I will understand.

Accordingly, the technical scope of the present invention should be defined by the following claims.

10: Neutral switch 20: Accelerator pedal sensor
30: engine RPM sensor 40: vehicle speed sensor
50: inclination sensor 60:
70: EPB driver

Claims (8)

A neutral switch for sensing a neutral state of the manual transmission;
An accelerator pedal sensor for detecting an operating state of the accelerator pedal;
An engine RPM sensor for measuring engine speed;
A vehicle speed sensor for measuring the speed of the vehicle;
An EPB driver for electronically actuating and releasing the parking brake;
Wherein the control unit learns a shift point of the manual transmission through the neutral switch, the accelerator pedal sensor, the engine RPM sensor, and the vehicle speed sensor, and then controls the EPB driver when the state of the vehicle reaches the shift point in the EPB locked state And a controller for automatically releasing the EPB when the electronic parking brake system is turned on.
The electronic control apparatus of an electronic parking brake system according to claim 1, further comprising an inclination sensor for measuring an inclination of the vehicle.
3. The apparatus of claim 2, wherein the control unit corrects the shift point according to an inclination measured by the inclination sensor to automatically release the EPB.
2. The shift control device according to claim 1, wherein the shift point is a shift point of the neutral speed switch, wherein the neutral speed switch is operated in a state in which the accelerator pedal is operated and the rising inflection point of the engine speed and the opening speed of the accelerator pedal at the time of occurrence of the vehicle speed, Wherein the electronic parking brake system comprises:
The control unit determining the popularity status of the neutral switch in the EPB locked state;
Determining an operating state of the accelerator pedal when the controller is in a popular state;
Determining whether a shift point is reached by receiving an engine RPM and a vehicle speed after the accelerator pedal is operated;
Determining whether the control point reaches the shift point, and releasing the EPB when the control point reaches the shift point.
6. The method of claim 5, further comprising: determining whether a vehicle speed has occurred when the control unit determines that the shift point has not been reached and has not reached the shift point;
Further comprising the step of determining that the vehicle speed has occurred and correcting the shift point learning value when the vehicle speed has been generated, and then releasing the EPB.
The electronic parking brake system according to claim 5, wherein the step of determining whether or not the shift point has been reached further comprises the step of the controller receiving the tilt angle from the tilt sensor and correcting the shift point according to the tilt angle. Of controlling the DIA.
6. The shift control apparatus according to claim 5, wherein the shift point is a point at which the control unit operates the accelerator pedal when the accelerator pedal is operated in a state of popularity of the neutral switch and at the time when the upward inflection point of the engine speed and the vehicle speed are generated, Wherein the learning is performed by storing the number of revolutions of the electronic parking brake system.

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