KR102558013B1 - Vehicle brake apparatus and controlling method of the same - Google Patents

Abstract

A vehicle brake device and a control method thereof are disclosed. Accordingly, the vehicle brake device includes a brake; Wow, brake booster; And, a sensor unit for sensing a driving-related motion of the vehicle; and a vacuum pump generating vacuum pressure within a first operating range and supplying the vacuum pressure to the brake booster. and a vacuum pump controller configured to control the vacuum pump to generate the vacuum pressure when the brake is operated while the engine of the vehicle is turned on, wherein the vacuum pump controller may set a second operating range different from the first operating range, and control the vacuum pump to generate the vacuum pressure within the second operating range, when it is determined that the number of times the brake is operated is greater than or equal to a threshold value or that the brake is suddenly braked based on a driving-related operation of the vehicle.

Description

Vehicle brake device and control method thereof {VEHICLE BRAKE APPARATUS AND CONTROLLING METHOD OF THE SAME}

The present invention relates to a vehicle brake device and a control method thereof, and more particularly, to a vehicle brake device capable of analyzing a driving pattern of a vehicle and controlling a vehicle brake in response thereto, and a control method thereof.

A vehicle brake device is a device that decelerates or stops a vehicle by generating a braking force for a vehicle in motion. In general, a brake device operates by transmitting a force (press force) of stepping on a brake pedal to a master cylinder and converting it into hydraulic force.

As the performance of vehicles has improved due to continuous technology development, it has become difficult to secure sufficient braking power with the driver's power alone. As a result, various automobile parts are being developed to secure the braking force of the brake.

The vacuum booster is a device that doubles the brake braking force by using the pressure difference between atmospheric pressure and vacuum. By applying a brake booster using vacuum pressure, vacuum force is applied to the driver's leg power and the doubled hydraulic force is transmitted to each brake, thereby increasing the braking force. In particular, hybrid vehicles or lightweight vehicles, which are being actively developed recently, require more lightweight engines. As the engines become lighter, the lack of vacuum in the vacuum booster appears, which can affect braking force. In order to solve this problem, a vacuum pump for assisting vacuum power and a vacuum pump driving controller for a power brake for controlling the vacuum pump have been proposed.

Conventional vacuum pump driving controllers control the vacuum pump in response to the measured degree of vacuum in order to provide a stable leg force to the brake. For example, the vacuum pressure supplied through the vacuum pump is changed in consideration of the degree of vacuum of the brake booster.

However, the current vacuum pump driving controller does not control the vacuum pressure of the vacuum pump in consideration of the driving conditions of the vehicle.

Korean Patent Publication No. 10-2019-0026635 (2019.03.13.)

An object to be solved by the present invention is to define an algorithm for controlling the vacuum pressure of a vacuum pump in consideration of driving conditions of a vehicle, and to provide a vehicle brake device capable of controlling the vacuum pump based on the defined algorithm and a control method thereof.

A vehicle brake device according to an embodiment of the present invention includes a brake; Wow, brake booster; And, a sensor unit for sensing a driving-related motion of the vehicle; and a vacuum pump generating vacuum pressure within a first operating range and supplying the vacuum pressure to the brake booster. and a vacuum pump controller configured to control the vacuum pump to generate the vacuum pressure when the brake is operated while the engine of the vehicle is turned on, wherein the vacuum pump controller may set a second operating range different from the first operating range, and control the vacuum pump to generate the vacuum pressure within the second operating range, when it is determined that the number of times the brake is operated is greater than or equal to a threshold value or that the brake is suddenly braked based on a driving-related operation of the vehicle.

In the vehicle brake device, the first operating range, the minimum value is set to the first initial starting vacuum pressure and the maximum value is set to the end vacuum pressure, the second operating range, the minimum value is set to the second initial starting vacuum pressure and the maximum value is set to the ending vacuum pressure, the second initial starting vacuum pressure is the first initial starting vacuum pressure plus a control range variation constant, and may be set below the limit vacuum pressure.

In the vehicle brake device, the control range variable constant may be set to a predetermined pressure value as a fixed constant.

In the vehicle brake device, the control range variation constant may be set as a function formula proportional to a slope per hour of the displacement of the brake as a variable constant.

In the vehicle brake device, the vacuum pump controller may determine whether the number of times the brake is operated for a predetermined time is greater than or equal to the threshold value.

In the vehicle brake device, the sensor unit includes a brake position sensor, and the vacuum pump controller determines that the brake has braked suddenly if a change in position for a predetermined time after operation of the brake measured by the brake position sensor is equal to or greater than a reference slope.

A control method of a vehicle brake device according to another embodiment of the present invention includes the steps of detecting a driving-related motion of a vehicle; and generating, by a vacuum pump, vacuum pressure within a first operating range and supplying the vacuum pressure to the brake booster when the brake is operated while the engine of the vehicle is turned on. Including, but, based on the driving-related operation of the vehicle, if it is determined that the number of times the brake is operated is greater than or equal to a threshold value or that the brake has braked suddenly, a second operating range different from the first operating range is set, and the vacuum pressure can be generated in the second operating range.

In the control method of the vehicle brake device, the first operating range has a minimum value set to a first initial starting vacuum pressure and a maximum value set to an end vacuum pressure, and the second operating range has a minimum value set to a second initial starting vacuum pressure and the maximum value is set to the ending vacuum pressure, and the second initial starting vacuum pressure is obtained by adding a control range variation constant to the first initial starting vacuum pressure, and may be set below a limit vacuum pressure.

In the control method of the vehicle brake device, the control range variation constant may be set to a predetermined pressure value as a fixed constant.

In the control method of the vehicle brake device, the control range variation constant may be set as a function formula proportional to a slope per hour of the displacement of the brake as a variable constant.

In the control method of the vehicle brake device, it may be determined whether the number of times the brake is operated for a predetermined time is greater than or equal to the threshold value.

In the control method of the vehicle brake device, the vehicle brake device further includes a brake position sensor, and if the change in position for a predetermined time after operation of the brake measured by the brake position sensor is equal to or greater than a reference slope, it can be determined that the brake has braked suddenly.

According to an embodiment of the present invention, it is possible to define an algorithm for controlling the vacuum pressure of the vacuum pump in consideration of driving conditions of the vehicle, and control the vacuum pump based on the algorithm.

In addition, according to an exemplary embodiment of the present invention, safety and reliability of brake braking may be increased by appropriately doubling the vacuum pressure to the brake in consideration of the driving condition of the vehicle.

1 is a block diagram showing the configuration of a vehicle brake device according to the present invention.
2 is a diagram showing the configuration of a vacuum pump controller included in a vehicle brake device according to the present invention.
3 is a diagram illustrating a control process of a vehicle brake device according to an embodiment of the present invention.
4A and 4B are diagrams for explaining a method in which a vehicle brake apparatus according to the present invention analyzes a driving pattern of a vehicle.
5 is a diagram illustrating a computing device according to an embodiment of the present invention.

Hereinafter, with reference to the accompanying drawings, embodiments of the present invention will be described in detail so that those skilled in the art can easily carry out the present invention. However, the present invention may be embodied in many different forms and is not limited to the embodiments described herein. And in order to clearly explain the present invention in the drawings, parts irrelevant to the description are omitted, and similar reference numerals are attached to similar parts throughout the specification.

In this specification, redundant descriptions of the same components are omitted.

Also, in this specification, when a component is referred to as being 'connected' or 'connected' to another component, it may be directly connected or connected to the other component, but other components may exist in the middle. It should be understood. On the other hand, in this specification, when a component is referred to as 'directly connected' or 'directly connected' to another component, it should be understood that no other component exists in the middle.

In addition, terms used in this specification are only used to describe specific embodiments and are not intended to limit the present invention.

Also, in this specification, a singular expression may include a plurality of expressions unless the context clearly indicates otherwise.

In addition, in this specification, terms such as 'comprise' or 'having' are only intended to designate that the features, numbers, steps, operations, components, parts, or combinations thereof described in the specification exist, and one or more other features, numbers, steps, operations, components, parts, or combinations thereof.

Also in this specification, the term 'and/or' includes a combination of a plurality of listed items or any item among a plurality of listed items. In this specification, 'A or B' may include 'A', 'B', or 'both A and B'.

Also, in this specification, detailed descriptions of well-known functions and configurations that may obscure the subject matter of the present invention will be omitted.

1 is a block diagram showing the configuration of a vehicle brake device according to the present invention.

The vehicle brake device 100 according to the present invention may include a brake 110, a brake booster 120, a sensor unit 130, a vacuum pump 140, and a vacuum pump controller 150.

The brake 110 is implemented as a mechanical means and can receive a braking force for the vehicle.

The brake 110 may include a foot brake and a hand brake. The foot brake (main brake) is used to stop vehicle travel and can be operated by the driver's foot. To this end, the foot brake is configured in the form of a pedal, and receives the pedal force generated when the driver steps on the pedal with his/her foot. The hand brake (side brake) is used as an aid when the foot brake does not work, and can be operated by the driver's hand. To this end, the handbrake is configured in the form of a lever or rod, and receives driving force generated by a driver's hand operation.

The brake booster 120 may double the braking force of the brake 110 .

Specifically, the brake booster 120 may transfer the doubled hydraulic force to the brake 110 by applying vacuum force to the driver's foot force or driving force. Thereby, the braking force can be improved.

The sensor unit 130 may detect driving-related motions of the vehicle.

The driving-related operation of the vehicle may include turning on or off of starting the vehicle, driving a brake, and the like.

To this end, the sensor unit 130 may include a distance sensor, an acceleration sensor, a speed sensor, a motion sensor, a brake position sensor, and the like.

The vacuum pump 140 may provide vacuum force to the brake booster 120 .

The vacuum pump 140 is a device that creates a vacuum inside the target object, and may be implemented as an electronic vacuum pump or a mechanical vacuum pump. The vacuum pump 140 fills up the insufficient vacuum force of the brake booster 120 so that the driver can brake the vehicle with sufficient pressure.

Specifically, the vacuum pump 140 may generate vacuum pressure in the first operating range and supply it to the brake booster 120 . Here, in the first operating range, the minimum value may be set as the first initial starting vacuum pressure and the maximum value may be set as the end vacuum pressure.

The vacuum pump controller 150 may control driving of the vacuum pump 140 .

The vacuum pump controller 150 may analyze the driving condition of the vehicle and control driving of the vacuum pump 140 based on the analysis.

The vacuum pump controller 150 may constantly control the vacuum pump 140 when the vehicle is turned on. In this case, the vacuum pump controller 150 may variably control the operating range of the vacuum pump 140 when it is determined that the number of brakes is large or that the brake is sudden.

Specifically, the vacuum pump controller 150 may control the vacuum pump 140 to generate vacuum pressure when the brake 110 operates while the engine of the vehicle is turned on.

The vacuum pump controller 150 may set a second operating range different from the first operating range, and control the vacuum pump 140 to generate vacuum pressure in the second operating range, when it is determined that the number of times the brake 110 is operated is greater than or equal to a threshold value or that the brake 110 brakes suddenly based on the driving-related operation of the vehicle. Here, in the second operating range, the minimum value may be set as the second initial starting vacuum pressure and the maximum value may be set as the end vacuum pressure. In this case, the second initial starting vacuum pressure is obtained by adding the control range variation constant to the first initial starting vacuum pressure, and may be set below the limiting vacuum pressure.

To this end, the vacuum pump controller 150 may set a control range variation constant. The control range variable constant may be set as a fixed constant or a variable constant according to an embodiment. According to one embodiment, when the control range variation constant is a fixed constant, it may be set to a predetermined pressure value. In addition, when the control range variation constant is a variable constant, it may be set as a function formula proportional to the slope per hour of the displacement of the brake.

The vacuum pump controller 150 may determine whether the number of times the brake 110 is operated for a predetermined time is greater than or equal to a threshold value.

In addition, the vacuum pump controller 150 may determine that the brake 110 has braked suddenly if the change in position for a predetermined time after operation of the brake measured by the brake position sensor is equal to or greater than a reference slope.

2 is a diagram showing the configuration of a vacuum pump controller included in a vehicle brake device according to the present invention.

The vacuum pump controller 150 may generate a vacuum pump control algorithm based on the driving pattern of the vehicle and control the vacuum pump 140 according to the generated control algorithm.

To this end, the vacuum pump controller 150 may include a plurality of arithmetic modules composed of an input module 210, a judgment module 220, a normal control mode 230, a variable control mode 235, and an output module 240, as shown in FIG. Meanwhile, FIG. 2 shows a case where the vacuum pump controller 150 is implemented as hardware such as a module, but the present invention is not limited thereto. Depending on the embodiment, the vacuum pump controller 150 may be implemented as a computer program or software capable of implementing a control algorithm.

The input module 210 may receive parameters and parameter values for generating and driving a vacuum pump control algorithm. Here, the parameters may include the number of brake operations, brake position displacement, time, initial start vacuum pressure, end vacuum pressure, control range variation constant, and limit vacuum pressure. A parameter value is a measurement value of a parameter and may be measured in a measurement unit corresponding to the parameter.

To this end, the input module 210 may perform wired/wireless communication with various components such as a vacuum sensor included in the vehicle brake device 100, an engine control device, and a communication module.

The determination module 220 may determine the control mode of the vacuum pump 140 . Specifically, the determination module 220 may determine whether to control the vacuum pump 140 based on which one of the normal control mode 230 and the variable control mode 235 . The normal control mode 230 defines an operating range in which the vacuum pump 140 is normally controlled, and the variable control mode 235 defines an operating range in which the vacuum pump 140 is controlled in an emergency.

The determination module 220 analyzes the driving state of the vehicle, controls the vacuum pump 140 in the general control mode in a normal driving state, and controls the vacuum pump 140 in a variable control mode in a state in which braking by the brake 110 is urgently required.

The normal control mode 230 may control the vacuum pump 140 in a first operating range. Here, in the first operating range, the minimum value is set to the first initial start vacuum pressure and the maximum value is set to the end vacuum pressure.

The variable control mode 235 may control the vacuum pump 140 in the second operating range. Here, in the second operating range, the minimum value is set to the second initial starting vacuum pressure and the maximum value is set to the end vacuum pressure.

In this case, the second initial starting vacuum pressure is defined as adding the control range variation constant to the first initial starting vacuum pressure, and is set below the limiting vacuum pressure. Therefore, the second initial starting vacuum pressure may be defined as in Equation 1 below.

First initial start vacuum pressure + control range variation constant (A) = second initial start vacuum pressure ≤ limit vacuum pressure ≤ end vacuum pressure [Equation 1]

There are cases in which braking by the brake 110 is urgently requested according to driving conditions. For example, there is a case where an obstacle is present at a very close position and the travel distance from when the brake 110 starts operating to when it comes to a complete stop has to be short. In addition, there are cases in which the brake 110 is operated several times in order to quickly stop the vehicle.

In this case, in order to double the braking force of the brake 110 by supplying sufficient vacuum force from the vacuum pump 140 to the brake booster 120, in the present invention, the initial starting vacuum pressure of the vacuum pump 140 is set high. As a result, the vacuum pump 140 can supply a larger amount of vacuum force to the brake booster 120 by setting the initial starting vacuum pressure higher than usual in an emergency situation.

The control range variable constant A may be defined as a fixed value or a variable value so as to provide an appropriate vacuum pressure for various situations requiring emergency braking.

Specifically, the control range variable constant A may be a fixed constant or a variable constant. When the control range variation constant (A) is a fixed constant, it may be set to a predetermined pressure value (ex: 10 kPa). When the control range variation constant A is a variable constant, it may be set as a function formula proportional to the slope per hour of the brake displacement.

The output module 240 may generate a control value according to the normal control mode 230 or the variable control mode 235 . In this case, the vacuum pump controller 150 may control the vacuum pump 140 based on the control value.

3 is a diagram illustrating a control process of a vehicle brake device according to an embodiment of the present invention.

The control process of the vehicle brake device according to the present invention includes the steps of detecting a driving-related operation of the vehicle, and when the brake is operated while the vehicle is turned on, the vacuum pump generates vacuum pressure in a first operating range and supplies it to the brake booster; Including, but, based on the driving-related operation of the vehicle, if it is determined that the number of times the brake is operated is greater than a threshold value or the brake is braked suddenly, a second operating range different from the first operating range is set, and the vacuum pressure can be generated in the second operating range.

Hereinafter, referring to FIG. 3, a control process of a vehicle brake device according to an embodiment of the present invention will be described.

The vehicle engine is turned on (S301).

When power is supplied to the vehicle and the vehicle is started, the sensor unit 130 of the vehicle brake device 100 detects this. In this case, the vacuum pump controller 150 initializes the state of the vacuum pump 140 .

The brake state is monitored (S302).

The sensor unit 130 of the vehicle brake device 100 monitors the state of the brake 110, and measures whether the brake 110 is operated, the number of times the brake 110 operates, and the displacement of the brake 110.

The number of brake operation is determined (S303).

The number of brake operations may be defined as the number of brake operations per unit time. The unit time may be set differently depending on the vehicle driving environment (ex: road conditions such as unpaved roads, snowy or rainy weather conditions, etc.) or vehicle conditions (ex: mileage, age of the vehicle, etc.).

It is determined whether the number of brake operations is greater than or equal to a threshold value (S304).

Generally, in an emergency situation, when trying to stop a vehicle quickly or abruptly, a driver operates the brake several times within a short period of time. Accordingly, when the number of brake operations per unit time is high, the vacuum pump controller 150 may control the vacuum pump 140 differently than usual.

If the number of brake operations is equal to or greater than the threshold value (S304-Yes), the vacuum pump controller 150 of the vehicle brake device 100 controls the vacuum pump 140 in a variable control mode (S307).

On the other hand, if the number of brake operations is less than the threshold value (S304-No), the sensor unit 130 of the vehicle brake device 100 determines the gradient of the brake position change (S305).

The steeper the gradient of the brake position change, the greater the position displacement of the brake for a short period of time. This means that the driver hastily operated the brake 110 to quickly brake the vehicle. Accordingly, if the slope of the brake position change is greater than or equal to the reference slope, the vacuum pump controller 150 may control the vacuum pump 140 differently than usual.

If the gradient is greater than or equal to the reference slope (S306-Yes), the vacuum pump controller 150 controls the vacuum pump 140 in a variable control mode (S307).

On the other hand, if it is less than the reference slope (S306-No), the vacuum pump controller 150 controls the vacuum pump 140 in a normal control mode (S308).

When controlling the vacuum pump 140 in the normal control mode, the vacuum pump controller 150 may control the vacuum pump 140 in a first operating range. In the first operating range, a minimum value may be set as a first initial starting vacuum pressure and a maximum value may be set as an end vacuum pressure.

When controlling the vacuum pump 140 in the variable control mode, the vacuum pump controller 150 may control the vacuum pump 140 in the second operating range. In the second operating range, a minimum value may be set as the second initial starting vacuum pressure and a maximum value may be set as the end vacuum pressure. In this case, the second initial starting vacuum pressure is obtained by adding the control range variation constant to the first initial starting vacuum pressure, and may be set below the limiting vacuum pressure.

In an existing general brake system, the degree of vacuum of the brake booster is measured in real time, and the pressure of the vacuum pump is increased or decreased or operation is stopped in response thereto. As a result, the vacuum pump can be stably driven even when problems such as low vacuum or excessive operation occur. However, even though the operating environment of the brake varies according to the driving situation of the vehicle, it is not currently reflected and taken into consideration when controlling the vacuum pump.

In the present invention, the driving pattern of the vehicle is analyzed, and the vacuum pump is variably controlled in response thereto. As a result, the vacuum pump is differently controlled according to the operating state of the brake, so that the safety of brake braking can be increased.

4A and 4B are diagrams for explaining a method in which a vehicle brake apparatus according to the present invention analyzes a driving pattern of a vehicle.

The vacuum pump controller 150 of the vehicle brake device 100 may analyze the driving pattern of the vehicle and, based on this analysis, may control the operation of the vacuum pump 140 in general or variably. In this case, the vacuum pump controller 150 may variably control the operating range of the vacuum pump 140 when the number of brake operations is large or when it is determined that the brake operation is sudden.

Therefore, a method for determining that the number of brake operations is large or sudden braking must be defined.

It is possible to determine whether the number of brake operations is high by determining the number of brake operations per unit time. According to an exemplary embodiment, as for the determination reference value, the reference number of operations may be given as N and the measurement reference time may be given as T. By measuring the number of brake operations, if the number of measurements exceeds N and the measurement time is less than T, it can be determined that the number of brake operations is large. In this case, the vacuum pump 140 is operated in a variable control mode.

Sudden braking may be determined based on the arrival time to the reference position measured by the brake position sensor. According to an embodiment, the judgment reference value may be defined by the following [Equation 2].

Position sensor change value / measurement time = △P / △T = A [Equation 2]

If the number of sudden braking times divided by the total number of braking times is greater than K, the variable control mode may be entered.

4A is a graph illustrating the operation of a brake switch.

The brake switch can operate the brake as it is turned on and off. As the brake switch is turned on, it transmits a high signal to the brake, whereby the brake operates. When the brake switch is turned off, a low signal is sent to the brake, in which case the brake does not operate.

The vacuum pump controller 150 measures the time after the brake is turned on and measures the number of brake operations within the reference time to determine whether the number of brake operations is large. When the number of uses exceeds the reference number N, the control range of the vacuum pump 140 is changed.

Referring to FIG. 4A , a first graph 410 indicates that the brake was operated once during Δt, and a second graph 420 indicates that the brake was operated twice during Δt. If the brake is operated by the reference number of times N during the reference time Δt, the vacuum pump controller 150 determines that the number of brake operations is large.

4B is a graph showing positional displacement values of the brake switch.

If the change in position for a predetermined time after operation of the brake measured by the brake position sensor is equal to or greater than the reference slope, it may be determined that the brake has braked suddenly.

Specifically, the time taken from the brake-on point to the displacement reference point and the variation gradient value are measured, and if the measured gradient value P' exceeds the reference gradient P, it can be determined that the brake has braked suddenly.

In FIG. 4B, the brake position displacement measured by the brake position sensor is measured as ΔP1, ΔP2, ΔP3, and the like. However, since the positional displacement of the brake is measured based on the displacement reference point that is the starting point for measuring a predetermined time, that is, the time measurement reference displacement, ΔP3 = ΔP is the brake positional displacement.

The time taken from the brake-on point to the displacement reference point is Δt1, Δt2, Δt3, and the like. When the slope of the brake position displacement at each time is obtained, it can be seen that Δt2 has the steepest slope. In this case, when the slope at each time is greater than or equal to the reference slope, it may be determined that sudden braking has occurred.

5 is a diagram illustrating a computing device according to an embodiment of the present invention. The computing device TN100 of FIG. 5 may be the vehicle brake device 100 described herein.

In the embodiment of FIG. 5 , the computing device TN100 may include at least one processor TN110, a transceiver TN120, and a memory TN130. In addition, the computing device TN100 may further include a storage device TN140, an input interface device TN150, and an output interface device TN160. Elements included in the computing device TN100 may communicate with each other by being connected by a bus TN170.

The processor TN110 may execute program commands stored in at least one of the memory TN130 and the storage device TN140. The processor TN110 may mean a central processing unit (CPU), a graphics processing unit (GPU), or a dedicated processor on which methods according to embodiments of the present invention are performed. Processor TN110 may be configured to implement procedures, functions, methods, and the like described in relation to embodiments of the present invention. The processor TN110 may control each component of the computing device TN100.

Each of the memory TN130 and the storage device TN140 may store various information related to the operation of the processor TN110. Each of the memory TN130 and the storage device TN140 may include at least one of a volatile storage medium and a non-volatile storage medium. For example, the memory TN130 may include at least one of read only memory (ROM) and random access memory (RAM).

The transmitting/receiving device TN120 may transmit or receive a wired signal or a wireless signal. The transmitting/receiving device TN120 may perform communication by being connected to a network.

On the other hand, the embodiments of the present invention are not implemented only through the devices and / or methods described so far, but may be implemented through a program that realizes functions corresponding to the configuration of the embodiments of the present invention or a recording medium in which the program is recorded.

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 within the scope of the present invention.

100: vehicle brake device 110: brake
120: brake booster 130: sensor unit
140: vacuum pump 150: vacuum pump controller
210: input module 220: judgment module
230: normal control mode 235: variable control mode
240: output module

Claims (12)

In the vehicle brake device,
brake;
brake booster;
a sensor unit that senses driving-related motions of the vehicle;
a vacuum pump generating vacuum pressure in a first operating range and supplying it to the brake booster; and
A vacuum pump controller for controlling the vacuum pump to generate the vacuum pressure when the brake is operated while the engine of the vehicle is turned on;
The vacuum pump controller,
Setting a second operating range different from the first operating range when the displacement per time of the brake is equal to or greater than a reference slope based on the driving-related operation of the vehicle;
configured to control the vacuum pump to generate the vacuum pressure in the second operating range;
In the first operating range, the minimum value is set to a first initial start vacuum pressure and the maximum value is set to an end vacuum pressure,
In the second operating range, the minimum value is set to the second initial start vacuum pressure and the maximum value is set to the end vacuum pressure,
The second initial starting vacuum pressure is greater than the first initial starting vacuum pressure by a control range variation constant,
The control range variation constant is determined based on the displacement per time of the brake,
vehicle brake system.
delete delete delete delete According to claim 1,
The sensor unit includes a brake position sensor,
The displacement per hour of the brake is determined based on a change in position for a predetermined time after operation of the brake measured by the brake position sensor.
vehicle brake system.
In the control method of the vehicle brake device,
An operation of detecting a driving-related operation of the vehicle; and
generating a vacuum pressure in a first operating range by a vacuum pump and supplying the vacuum pressure to a brake booster when the brake is operated in a state in which the ignition of the vehicle is turned on;
setting a second operating range different from the first operating range when the displacement per time of the brake is equal to or greater than a reference slope based on the driving-related operation of the vehicle; and
Controlling the vacuum pump to generate the vacuum pressure in the second operating range;
In the first operating range, the minimum value is set to a first initial start vacuum pressure and the maximum value is set to an end vacuum pressure,
In the second operating range, the minimum value is set to the second initial start vacuum pressure and the maximum value is set to the end vacuum pressure,
The second initial starting vacuum pressure is greater than the first initial starting vacuum pressure by a control range variation constant,
The control range variation constant is determined based on the displacement per time of the brake, the control method of the vehicle brake device.
delete delete delete delete According to claim 7,
The vehicle brake device further includes a brake position sensor,
The displacement per hour of the brake is determined based on a change in position for a predetermined time after operation of the brake measured by the brake position sensor.

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