KR20180130714A - Control apparatus for auto vehicle hold of a vehicle and method thereof - Google Patents

Abstract

The present invention relates to an automatic hold control apparatus for a vehicle and a method thereof, capable of selectively controlling a brake according to an inclination of a road on which the vehicle is currently stopped when an automatic hold operation is performed, operating a brake that has not been operated previously for each automatic hold operation to extend the endurance life of a brake system, and reducing a drag when the vehicle departs. The automatic hold control apparatus for a vehicle includes: an information acquisition unit for acquiring a vehicle speed, brake pedal information, accelerator pedal information, and road inclination information; an automatic hold switch for selecting an automatic hold operation of the vehicle; an electronic control unit (ECU) for analyzing the information acquired by the information acquisition unit to determine whether an automatic hold function is operated when the automatic hold function is selected, determining a number of brakes to be controlled according to the road inclination information when the automatic hold operation is performed, and sequentially operating brakes other than the brake used immediately at a previous time according to the determined number of brakes; and a hydraulic electronic control unit (HECU) for generating a hydraulic pressure for the brake to brake a control target wheel.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to an automatic vehicle hold control apparatus,

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to an automatic vehicle hold (AVH) apparatus and method thereof, and more particularly to an automatic vehicle hold (AVH) The present invention relates to an apparatus for automatically controlling a hold of a vehicle and a method of controlling the same, which can extend a service life of a brake system by operating a brake that is not operated on a vehicle.

During vehicle operation, the driver must keep the brake pedal pressed for a long time to keep the vehicle stationary, such as in a signal waiting state. As an apparatus for solving such inconvenience, an AVH (Automatic Vehicle Hold) device which is an automatic vehicle holding device is widely used.

In other words, AVH (Automatic Vehicle Hold) system is a system for realizing signal waiting or easy stopping in a complex urban center or ramp where frequent parking lots occur frequently, and the cluster or switch is usually marked AUTO HOLD.

Such an automotive vehicle holding system is implemented as an electronic parking brake (EPB) system using an electronic parking brake or an ESC system using a hydraulic actuator.

In the case of ESC system, when the AVH activating switch is on, the hydraulic pressure is held automatically after inputting the brake pressure to maintain the braking force even if the driver releases the brake pedal.

AVH is a device that automatically maintains the braking power when the vehicle is stopped. Even if the AVH switch is turned on and the brakes are released after the vehicle is stopped, the braking force is maintained at the braking force until the vehicle starts again. And maintains the vehicle stop state. When the driver presses the accelerator pedal to start the vehicle again, the AVH stops operating and the brake is released automatically. These AVHs include a manual switch that allows the driver to select whether or not the AVH should be operated inside the vehicle, and the AVH operates only when the driver turns on the AVH manual switch.

Conventionally proposed techniques for an AVH mounted on a vehicle are disclosed in Patent Documents 1 to 2 described below.

(Patent Document 1), when the AVH (Auto Vehicle Hold) switch is turned on, the AVH function is activated. When the AVH is activated, the controller determines an object to be controlled. When the control object is determined, The control unit causes the hydraulic pressure to flow to generate the braking force, and controls so that the wheels of the vehicle are continuously cross-controlled by the generated braking force.

By this control, the continuous operation of the AVH prevents the overheat and burnout of the solenoid valve, thereby improving the limit control time for the wheel braking force.

The prior art disclosed in Patent Document 2 includes a communication unit for receiving the vehicle speed information of the vehicle and receiving the gear shift information of the user, and a D-speed gear shift by the user in the N-stop state of the vehicle, And a control unit for increasing the braking pressure at a predetermined first time after the movement of the vehicle is sensed.

With this configuration, the AVH is released after the vehicle is stopped, thereby improving the ride quality.

Korean Patent Laid-Open No. 10-2016-0087275 (published on July 21, 2016) (Vehicle automatic hold control method) Korean Patent Registration No. 10-1723391 (Announcement of Apr. 201, 2015) (Automobile Vehicle Hold System and Control Method Thereof)

However, since the AVH system of the general vehicle and the AVH system disclosed in the related art implement AVH in such a manner that all the brakes are driven regardless of the inclination of the road during the AVH operation, all the brakes are driven at every AVH operation, And a drag sensation occurs due to a difference in brake release timing at the time of vehicle start-up.

The conventional technique disclosed in Patent Document 1 can extend the durability life of the brake system as compared with the technique of continuously driving the brakes at the same time by continuously controlling the brakes in the AVH operation, All of the brakes operate, and as a result, there is a disadvantage that it is impossible to maximize the durability life of the brake system.

SUMMARY OF THE INVENTION Accordingly, the present invention has been made keeping in mind the above problems occurring in the prior art, and it is an object of the present invention to provide an automatic vehicle hold control apparatus, The present invention provides an automatic hold control apparatus for a vehicle and a method thereof, which can extend a service life of a brake system by operating a brake that is not operated on a vehicle, and reduce drag when the vehicle starts.

According to an aspect of the present invention, there is provided an automatic hold control apparatus for a vehicle, including an information obtaining unit for obtaining a vehicle speed, brake pedal information, an Excel pedal information, and road gradient information; An automatic hold switch for selecting an automatic hold operation of the vehicle; Wherein when the automatic hold function is selected by the operation of the automatic hold switch, the information obtained by the information obtaining unit is analyzed to determine whether or not the automatic hold function is operated, and the number of brakes to be controlled according to the road inclination information An electronic control unit (ECU) for sequentially operating the brakes other than the brakes used immediately before, in accordance with the determined number of brakes; And a hydraulic pressure regulator (HECU) for generating a hydraulic pressure for braking in accordance with the brake control of the electronic control unit to brake the control target wheel.

In this case, the electronic control unit analyzes the road inclination information when the automatic hold function is operated, and if the inclination is less than the first inclination level, only one of the front left wheel, the front right wheel or the rear left / If the road gradient is the first gradient level or more and the gradient is less than the second gradient level, only the front left wheel, the front right wheel or the rear left / right wheel applies the braking force to perform the automatic hold function, And when both the front left wheel, the front right wheel and the rear left / right wheel apply a braking force, the automatic left hold function is performed.

In order to achieve the above object, the present invention provides an automatic hold control method for a vehicle, comprising: (a) if an automatic hold switch for performing an automatic vehicle hold (AVH) Acquiring information, Excel pedal information and road gradient information; (b) analyzing the acquired vehicle information to determine whether the automatic hold function is in operation; (c) analyzing the road gradient information when the automatic hold function is in operation; (d) determining the number of brakes to be controlled according to the analysis result of step (c), and sequentially executing the remaining brakes except the brakes used immediately before according to the determined number of brakes to execute the automatic vehicle hold function .

The step (d) includes the steps of (d1) analyzing the road inclination information and performing an automatic hold function by applying a braking force to any one of the front left wheel, the front right wheel, and the rear left and right wheels if the inclination is less than the first inclination level ; (d2) performing an automatic hold function by applying a braking force to only two of the front left wheel, the front right wheel, and the rear left / right wheels if the road gradient is the first inclination level or more and the inclination is less than the second inclination level; (d3) performing the automatic hold function by applying a braking force to both the front left wheel, the front right wheel and the rear left / right wheel when the road gradient is equal to or higher than the second inclination level.

According to the present invention, it is possible to selectively control the brakes according to the inclination of the road on which the vehicle is currently stopped during the automatic vehicle hold operation, and to extend the service life of the braking system by operating the brakes not previously operated for each automatic hold operation , It is possible to reduce the drag at the time of starting the vehicle.

1 is a block diagram of an automatic hold control apparatus for a vehicle according to the present invention;
2 is a flowchart showing an automatic hold control method of a vehicle according to the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An automatic hold control apparatus and method of a vehicle according to a preferred embodiment of the present invention will now be described in detail with reference to the accompanying drawings.

FIG. 1 is a block diagram of an automatic hold control apparatus for a vehicle according to a preferred embodiment of the present invention, which includes an information obtaining unit 10, an electronic control unit (ECU) 20, an automatic hold switch 30, (HECU) 40, a wheel unit 50, and a cluster 60. [0033]

The information obtaining unit 10 obtains vehicle speed, brake pedal information, Excel pedal information, and road gradient information, and transmits the information to the electronic control unit 20.

The information acquiring unit 10 includes a first wheel speed sensor 11 for measuring the speed of the front left wheel (Front LH) wheel, a second wheel speed sensor 12 for measuring the speed of the front right wheel (Front RH) A third wheel speed sensor 13 for measuring the speed of the rear left (Rear LH) wheel, a fourth wheel speed sensor 14 for measuring the speed of the rear right (rear RH) wheel, a G- A brake pedal sensor 16 for detecting an operation amount of the brake pedal by using a master cylinder pressure measuring sensor or the like, an inclination sensor 15 for detecting an inclination, an accelerator pedal sensor 16 for detecting the position of the accelerator pedal And a sensor 17.

The automatic hold switch 30 is a switch for selecting the automatic hold (AVH) function of the vehicle, and is manually operated on / off by the driver.

When the automatic hold function is selected by the operation of the automatic hold switch 30, the electronic control unit 20 analyzes information acquired by the information obtaining unit 10 to determine whether the automatic hold function is operated, Determines the number of brakes to be controlled according to the road inclination information in the automatic hold operation, and sequentially operates the remaining brakes except for the brakes used immediately before, according to the determined number of brakes.

The electronic control unit 20 analyzes the road inclination information when the automatic hold (AVH) function is activated. If the inclination is less than the first inclination level, only the front left wheel, the front right wheel or the rear left / And performs the hold function by applying a braking force to only two of the front left wheel, the front right wheel, and the rear left / right wheels if the road inclination is the first inclination level or more and the inclination is less than the second inclination level, If the road inclination is equal to or higher than the second inclination level, the front left wheel, the front right wheel and the rear left / right wheel perform braking force to perform the automatic hold function.

Here, the slope level is a relationship of a first slope level < a second slope level, a first slope level means a slope capable of maintaining a vehicle's stationary state with a small braking force, and a second slope level indicates a greater braking force Which means that the vehicle can be maintained in a stopped state. It is preferable to set the slope according to each slope level through an experiment or the like.

The hydraulic pressure regulator 40 generates a hydraulic pressure for braking in accordance with the brake control of the electronic control unit 20 to brake the control target wheel.

The wheel portion 50 includes a front left wheel 51, a front right wheel 52 and a rear left / right wheel 53 for driving.

The cluster 60 is an instrument panel generally provided in a vehicle and serves to display vehicle speed information, engine speed information, coolant temperature information, and operation state information of an automatic vehicle hold function.

The operation of the automatic hold control apparatus for a vehicle according to the preferred embodiment of the present invention will now be described in detail.

First, the driver operates the automatic hold switch 30 on to operate the automatic vehicle hold function (AVH).

When the automatic hold switch 30 is operated in the ON state, the electronic control unit 20 displays on the cluster 60 an indication that the automatic vehicle hold function is operating, that is, ) To inform the driver that the automatic vehicle hold function is operating.

Thereafter, the electronic control unit 20 acquires various vehicle information through the information obtaining unit 10. [ For example, vehicle speed information, road gradient information, brake pedal information, and accelerator pedal information, which are speeds of respective wheels, are acquired, and the obtained information is analyzed to determine whether or not the automatic hold function is operated.

Here, the operation judgment of the automatic hold function is judged as the operation of the automatic hold function when the driver stops the vehicle by pressing the brake. When the automatic hold function is operated, the electronic control unit 20 lights the automatic hold function display lamp through the cluster 60 to inform the driver that the automatic hold function is operating. At this time, the driver keeps the vehicle in a stop state even when the driver releases his / her foot from the brakes. When the driver depresses the accelerator pedal in the state of operating with the automatic hold function, the electronic control unit 20 immediately releases the automatic hold function and informs the driver that the automatic hold function has been selected by lighting the automatic hold function display lamp to white.

[0031] Meanwhile, the electronic control unit 20 controls the hydraulic pressure regulator 40 to generate the braking force, and the braking force of the wheel unit 50 is braked by the generated braking force, Keep the vehicle stationary even if it is removed. In this case, since the brake system is operated by stopping the vehicle by continuously applying braking force to all the wheels at the same time or braking the wheels in successive alternations, it is impossible to extend the service life of the brake system, The drag sensation can not be reduced, thereby giving the driver a sense of heterogeneity.

In order to solve the problem of the conventional automatic hold function, in the present invention, the number of brakes to be controlled is determined according to the road gradient information in the automatic hold operation in the electronic control unit 20. [

For example, the electronic control unit 20 analyzes the road inclination information when the automatic hold (AVH) function is activated, and detects the slope of the slope lower than the first inclination level, which means an inclination capable of maintaining the vehicle in a stopped state with a low- The number of brakes to be controlled is determined so that only one of the front left wheel 51 or the front right wheel 52 or the rear left / right wheel 53 applies the braking force.

If the inclination of the road inclination is equal to or higher than the first inclination level and an inclination required for the braking force to be slightly lower than the braking force is less than the second inclination level, the front left wheel 51 or the front right wheel 52 or the rear left / Only two of the wheels 53 apply braking force to determine the number of brakes to be controlled.

The braking force for controlling the braking force of the front left wheel 51, the front right wheel 52 and the rear left / right wheel 53 is controlled so that the braking force is higher than the second inclination level, Determine the number.

In this case, as another feature of the present invention, in order to extend the durability life of the brake system and minimize the occurrence of a drag feeling at the time of vehicle rapid departure, after determining the number of brakes, the remaining brakes, The wheel to be controlled is determined.

For example, if the number of brakes to be controlled is one and the brake used immediately before is the front left wheel 51, the brake to be operated at this time is determined as the front right wheel 52 and the brake to be operated next is the rear left / Wheel 53 as shown in Fig. That is, the brakes are transmitted to the front left wheel 51, the front right wheel 52, the rear left / right wheel 53, the front left wheel 51, the front right wheel 52, And operates in the same order as the wheel 53.

If the number of brakes to be controlled is two, the brakes to be used are grouped into two pairs. If the brake pair used immediately before is the front left wheel 51 / front right wheel 52, the brake to be operated at this time is the front right wheel Rear left / right wheel 53, and the brake to be operated next is determined as the rear right / left wheel 53 / the front left wheel 51. In this case, That is, the brakes are transmitted to the front left wheel 51 / the front right wheel 52 -> the front right wheel 52 / the rear left / right wheel 53 -> the rear right / left wheel 53 / the front left wheel 51 Front right wheel 52 front right wheel 52 rear right wheel 53 rear right wheel 53 front left wheel 51 front left wheel 51 front right wheel 52 forward right wheel 52 rear right wheel 53 rear right wheel 53 front left wheel .

If the number of brakes to be controlled is three, control is performed such that all the front left wheel 51, the front right wheel 52, and the rear left / right wheel 53 are simultaneously operated.

According to this control, the hydraulic pressure regulator 40 generates the hydraulic pressure for braking and selectively brakes only the control target wheel.

As described above, the control target wheel is determined in accordance with the inclination of the road, and the control target wheel is alternately braked alternately, whereby the durability of the hydraulic pressure regulating device 40 for generating the hydraulic pressure can be ensured, thereby prolonging the life of the brake system So that the fuel economy can be improved.

In addition, when a vehicle starts and stops, a drag sensation can be reduced due to a difference in brake release timing, thereby minimizing a driver's sense of disturbance.

FIG. 2 is a flowchart illustrating a method of controlling an automatic hold control of a vehicle according to the present invention. FIG. 2 is a flowchart illustrating a method of controlling an automatic hold control of a vehicle according to the present invention. Pedal information and road gradient information (S101 to S102), (b) analyzing the acquired vehicle information to determine whether or not the automatic hold function is operated (S103), (c) (D) determining the number of brakes to be controlled according to the result of the analysis in the step (c), and calculating the number of brakes to be controlled in sequence based on the determined number of brakes, excluding the brakes used immediately before And executing the automatic vehicle hold function (S105 to S111).

The step (d) includes the steps of (d1) analyzing the road inclination information and performing an automatic hold function by applying a braking force to only one of the front left wheel, the front right wheel, and the rear left / right wheel if the inclination is less than the first inclination level S105, S106, S109), (d2) if the road gradient is the first gradient level or more and the gradient is less than the second gradient level, only two of the front left wheel, front right wheel or rear left / right wheel apply braking force, (D3) performing an automatic hold function by applying a braking force to both the front left wheel, the front right wheel, and the rear left / right wheels if the road inclination is equal to or higher than the second inclination level (step S107) S110 to S111).

The automatic hold control method of the vehicle according to the preferred embodiment of the present invention will now be described in detail.

First, in step S101, the driver operates the automatic hold switch 30 to turn on the automatic vehicle hold function (AVH).

When the automatic hold switch 30 is operated in the ON state, the electronic control unit 20 displays on the cluster 60 an indication that the automatic vehicle hold function is operating, that is, ) To inform the driver that the automatic vehicle hold function is operating.

Thereafter, the electronic control unit 20 acquires various vehicle information through the information obtaining unit 10 in step S102. For example, vehicle speed information, road gradient information, brake pedal information, and accelerator pedal information, which are speeds of respective wheels, are acquired, and information obtained in step S103 is analyzed to determine whether or not the automatic hold function is operated.

Here, the operation judgment of the automatic hold function is judged as the operation of the automatic hold function when the driver stops the vehicle by pressing the brake. When the automatic hold function is operated, the electronic control unit 20 lights the automatic hold function display lamp through the cluster 60 to inform the driver that the automatic hold function is operating. At this time, the driver keeps the vehicle in a stop state even when the driver releases his / her foot from the brakes. When the driver depresses the accelerator pedal in the state of operating with the automatic hold function, the electronic control unit 20 immediately releases the automatic hold function and informs the driver that the automatic hold function has been selected by lighting the automatic hold function display lamp to white.

[0031] Meanwhile, the electronic control unit 20 controls the hydraulic pressure regulator 40 to generate the braking force, and the braking force of the wheel unit 50 is braked by the generated braking force, Keep the vehicle stationary even if it is removed. In this case, since the brake system is operated by stopping the vehicle by continuously applying braking force to all the wheels at the same time or braking the wheels in successive alternations, it is impossible to extend the service life of the brake system, The drag sensation can not be reduced, thereby giving the driver a sense of heterogeneity.

In order to solve the problems of the conventional automatic hold function, the electronic control unit 20 determines the number of brakes to be controlled according to the road gradient information as in step S104 in the automatic hold operation.

For example, the electronic control unit 20 analyzes the road inclination information when the automatic hold (AVH) function is activated, and determines whether or not the first inclination, which means an inclination capable of maintaining the vehicle in a stopped state, The process proceeds to step S106 to determine the number of brakes to be controlled so that only one of the front left wheel 51 or the front right wheel 52 or the rear left / right wheel 53 is subjected to the braking force.

If it is determined in step S107 that the inclination of the road is equal to or higher than the first inclination level and the braking force is slightly lower than the first inclination level, the process proceeds to step S108 to determine whether the front left wheel 51 or the front Only two of the right wheel 52 or the rear left / right wheel 53 apply braking force to determine the number of brakes to be controlled.

If it is determined in step S110 that the road surface inclination is higher than the second inclination level indicating a required degree of inclination, the process proceeds to step S111 where the front left wheel 51, the front right wheel 52 and the rear left / 53) Determine the number of brakes to be controlled so that all braking forces are applied.

At this time, as another feature of the present invention, in order to extend the durability life of the brake system and minimize the generation of a drag feeling at the time of starting the vehicle, after determining the number of brakes, The control target wheel is determined so that the remaining brakes are sequentially operated.

For example, if the number of brakes to be controlled is one and the brake used immediately before is the front left wheel 51, the brake to be operated at this time is determined as the front right wheel 52 and the brake to be operated next is the rear left / Wheel 53 as shown in Fig. That is, the brakes are transmitted to the front left wheel 51, the front right wheel 52, the rear left / right wheel 53, the front left wheel 51, the front right wheel 52, And operates in the same order as the wheel 53.

If the number of brakes to be controlled is two, the brakes to be used are grouped into two pairs. If the brake pair used immediately before is the front left wheel 51 / front right wheel 52, the brake to be operated at this time is the front right wheel Rear left / right wheel 53, and the brake to be operated next is determined as the rear right / left wheel 53 / the front left wheel 51. In this case, That is, the brakes are transmitted to the front left wheel 51 / the front right wheel 52 -> the front right wheel 52 / the rear left / right wheel 53 -> the rear right / left wheel 53 / the front left wheel 51 Front right wheel 52 front right wheel 52 rear right wheel 53 rear right wheel 53 front left wheel 51 front left wheel 51 front right wheel 52 forward right wheel 52 rear right wheel 53 rear right wheel 53 front left wheel .

If the number of brakes to be controlled is three, control is performed such that all the front left wheel 51, the front right wheel 52, and the rear left / right wheel 53 are simultaneously operated.

According to this control, the hydraulic pressure regulator 40 generates the hydraulic pressure for braking and selectively brakes only the control target wheel.

As described above, the control target wheel is determined in accordance with the inclination of the road, and the control target wheel is alternately braked alternately, whereby the durability of the hydraulic pressure regulating device 40 for generating the hydraulic pressure can be ensured, thereby prolonging the life of the brake system So that the fuel economy can be improved.

In addition, when a vehicle starts and stops, a drag sensation can be reduced due to a difference in brake release timing, thereby minimizing a driver's sense of disturbance.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, but, on the contrary, It is obvious to those who have.

The present invention is applied to a technique for selectively activating a wheel in accordance with a road gradient when performing an automatic vehicle hold function in a vehicle, and extending the life of the brake system by sequentially operating the wheels.

10: information acquiring unit 20: automatic hold switch
30: Electronic control unit 40: Hydraulic control unit
50: wheel 60: cluster

Claims (4)

An apparatus for controlling an automatic hold function (AVH) of a vehicle,
An information obtaining unit for obtaining vehicle speed, brake pedal information, Excel pedal information, and road gradient information;
An automatic hold switch for selecting an automatic hold operation of the vehicle;
Wherein when the automatic hold function is selected by the operation of the automatic hold switch, the information obtained by the information obtaining unit is analyzed to determine whether or not the automatic hold function is operated, and the number of brakes to be controlled according to the road inclination information An electronic control unit (ECU) for sequentially operating the brakes other than the brakes used immediately before, in accordance with the determined number of brakes; And
And a hydraulic pressure regulator (HECU) for generating a hydraulic pressure for braking in accordance with the brake control of the electronic control unit to brake the control target wheel.
The electronic control apparatus according to claim 1, wherein the electronic control unit analyzes the road inclination information when the automatic hold function is operated and applies only one of the front left wheel, the front right wheel, and the rear left and right wheels if the inclination is less than the first inclination level, If the road gradient is a first inclination level or more and a slope below the second inclination level, only two of the front left wheel, the front right wheel, and the rear left and right wheels apply the braking force to perform the automatic hold function, Wherein the front left wheel, the front right wheel and the rear left / right wheel apply braking force to perform the automatic hold function when the inclination is equal to or higher than the second inclination level.
A method for controlling an automatic vehicle hold function (AVH) of a vehicle,
(a) acquiring vehicle speed, brake pedal information, Excel pedal information, and road gradient information when an automatic hold switch for performing an automatic vehicle hold (AVH) function is on;
(b) analyzing the acquired vehicle information to determine whether the automatic hold function is in operation;
(c) analyzing the road gradient information when the automatic hold function is in operation; And
(d) determining the number of brakes to be controlled according to the analysis result of step (c), and sequentially executing the remaining brakes except the brakes used immediately before according to the determined number of brakes to execute the automatic vehicle hold function Wherein the automatic hold control method comprises the steps of:
The method of claim 3, wherein the step (d) comprises the steps of: (d1) analyzing the road inclination information to determine whether the front left wheel, the front right wheel or the rear left / right wheel applies braking force, ; (d2) performing an automatic hold function by applying a braking force to only two of the front left wheel, the front right wheel, and the rear left / right wheels if the road gradient is the first inclination level or more and the inclination is less than the second inclination level; (d3) performing the automatic hold function by applying a braking force to both the front left wheel, the front right wheel and the rear left / right wheel when the road gradient is equal to or higher than the second inclination level .

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