KR102270208B1 - Vehicle hydraulic brake device and control method thereof - Google Patents

Abstract

A vehicle hydraulic braking device according to an embodiment of the present invention uses a hydraulic motor that pumps brake fluid and drives a hydraulic pump supplied to the wheel cylinders to increase the braking pressure of the wheel cylinders to control the braking force of the vehicle. A device comprising: a wheel speed detecting unit detecting a wheel speed of each wheel; a pedal stroke detecting unit detecting a pedal stroke of a brake pedal; a deceleration detecting unit detecting a deceleration of a vehicle; and a motor driving unit driving the hydraulic motor and determining the deceleration of the vehicle corresponding to the reference vehicle weight based on the vehicle speed according to each wheel speed detected through the wheel speed detecting unit and the pedal stroke detected through the pedal stroke detecting unit during vehicle braking, and the determined vehicle deceleration and Calculate the difference in deceleration between the actual decelerations detected through the deceleration detector, determine the amount of vehicle weight increase according to the calculated deceleration difference, determine the motor speed according to the determined vehicle weight increase, and according to the electronic control unit for controlling the hydraulic motor.

Description

Vehicle hydraulic brake system and its control method {VEHICLE HYDRAULIC BRAKE DEVICE AND CONTROL METHOD THEREOF}

The present invention relates to a vehicle hydraulic braking device and a control method thereof, and more particularly, to a vehicle hydraulic braking device having a pump for supplying hydraulic pressure to wheel cylinders of each wheel by pumping hydraulic pressure, and a hydraulic motor for driving the pump; It's about how to control it.

In general, a vehicle hydraulic brake system includes a brake booster.

A brake booster is a device that generates a large braking force with a small force using the difference in air pressure between vacuum and atmospheric pressure, and forms braking hydraulic pressure by transferring the braking force to the master cylinder.

The braking force of a vehicle is determined by the force the driver presses on the brake pedal.

When the vehicle is braking, the weight of the vehicle increases as the number of occupants increases or the amount of cargo increases. As the weight of the vehicle increases, more force is required for the driver to press the brake pedal.

If the weight of the vehicle increases when braking the vehicle due to an increase in the number of occupants or an increase in cargo, as the weight of the vehicle increases, the driver's brake pedal force must be increased in proportion to the increase in vehicle weight in order to not increase the braking distance. In a situation in which the power is weakened or the degree of learning about the feeling of the brake pedal is low, if the brake pedal is not pressed sufficiently, the desired braking force cannot be generated and the braking distance increases.

In other words, conventionally, regardless of the weight of the vehicle, braking force is generated in proportion to the force that the driver presses on the brake pedal, so as the number of passengers increases or the weight of the vehicle increases due to an increase in cargo, the driver may not be able to press the brake pedal with sufficient force. The braking distance can be long. Therefore, the braking performance of the vehicle cannot be effectively improved.

SUMMARY OF THE INVENTION An aspect of the present invention is to provide a vehicle hydraulic brake system and a control method thereof that assist braking force in response to an increase in vehicle weight due to an increase in occupants or cargo during vehicle braking.

According to an aspect of the present invention, there is provided a vehicle hydraulic braking device for controlling a braking force of a vehicle by increasing a braking pressure of the wheel cylinder by using a hydraulic motor for driving a hydraulic pump that pumps brake fluid and provides it to the wheel cylinders, a wheel speed detector for detecting a wheel speed of each wheel; a pedal stroke detection unit detecting a pedal stroke of a brake pedal; a deceleration detection unit that detects the deceleration of the vehicle; a motor driving unit for driving the hydraulic motor; and determining the deceleration of the vehicle corresponding to the reference vehicle weight based on the vehicle speed according to each wheel speed detected through the wheel speed detecting unit and the pedal stroke detected through the pedal stroke detecting unit during vehicle braking, and the determined Calculate the deceleration difference between the vehicle deceleration and the actual deceleration detected through the deceleration detection unit, determine the vehicle weight increase according to the calculated deceleration difference, and determine the motor speed according to the determined vehicle weight increase amount, , and an electronic control unit for controlling the hydraulic motor according to the determined motor speed may be provided.

The vehicle speed and the vehicle deceleration corresponding to the pedal stroke are mapped in advance with respect to the reference vehicle weight, and the weight increase amount of the vehicle due to an increase in occupants or cargo compared to the reference vehicle weight to correspond to the deceleration difference It is stored in advance and may include a storage unit in which the motor speed is stored in advance to correspond to an increase in the weight of the vehicle.

The storage unit may be stored in advance so that the greater the difference in the deceleration, the greater the weight increase of the vehicle and the increase in the motor speed.

According to another aspect of the present invention, a method of controlling a vehicle hydraulic brake system for controlling a braking force of a vehicle by increasing a braking pressure of the wheel cylinder using a hydraulic motor for driving a hydraulic pump that pumps brake fluid and provides it to the wheel cylinders In the following, the wheel speed of each wheel and the pedal stroke of the brake pedal are detected when the vehicle is braked, and the deceleration of the vehicle corresponding to the reference vehicle weight is determined based on the vehicle speed according to the detected wheel speed and the detected pedal stroke. determining, detecting an actual deceleration of the vehicle, calculating a deceleration difference between the determined vehicle deceleration and the detected actual deceleration, determining an increase in vehicle weight according to the calculated deceleration difference, and the determination A method of controlling a vehicle hydraulic brake system for determining a motor speed according to an increased amount of vehicle weight and controlling the hydraulic motor according to the determined motor speed may be provided.

The vehicle speed and the vehicle deceleration corresponding to the pedal stroke with respect to the reference vehicle weight are mapped in advance in a storage unit, and determining the deceleration of the vehicle includes the vehicle speed and the detected pedal in the storage unit. and finding a corresponding vehicle deceleration based on the stroke.

An increase in the weight of the vehicle due to an increase in occupants or cargo is stored in advance compared to the reference vehicle weight to correspond to the deceleration difference, and a motor speed is stored in advance in a storage unit to correspond to the increase in weight of the vehicle, Determining the motor speed is to find a weight increase amount of the vehicle corresponding thereto based on the deceleration difference in the storage unit, find a motor speed corresponding to the weight increase amount of the found vehicle, and use the found motor speed to the hydraulic pressure It may include determining the motor speed of the motor.

According to another aspect of the present invention, the control of a vehicle hydraulic brake system for controlling the braking force of a vehicle by increasing the braking pressure of the wheel cylinders using a hydraulic motor for driving a hydraulic pump that pumps brake fluid and provides it to the wheel cylinders In the method, detecting an increase in weight of the vehicle due to an increase in occupants or cargo when braking the vehicle, determining a motor speed according to the detected weight increase of the vehicle, and controlling the hydraulic motor according to the determined motor speed The detecting of the weight increase of the vehicle includes detecting each wheel speed and a pedal stroke, and determining a vehicle speed according to the detected wheel speed and a vehicle deceleration mapped in advance to correspond to the detected pedal stroke, , a control method of a vehicle hydraulic braking system for detecting an actual deceleration of the vehicle, and determining an increase in weight of the vehicle based on a deceleration difference obtained by subtracting the detected vehicle deceleration from the determined mapped vehicle deceleration. may be provided.

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An embodiment of the present invention detects an increase in vehicle weight due to an increase in occupants or cargo during vehicle braking, and increases the speed of the hydraulic motor by increasing the speed of the hydraulic motor in response to the detected weight increase to assist the braking force, thereby increasing the vehicle weight. The optimal motor speed can be appropriately varied for the vehicle, so the vehicle's braking distance can be reduced by the assisted braking force while maintaining the stability of the vehicle's behavior.

In addition, in the embodiment of the present invention, the vehicle weight increase amount is determined by determining the vehicle weight increase amount using the deceleration difference obtained by subtracting the actual deceleration value of the vehicle from the vehicle speed and the mapped vehicle deceleration value corresponding to the pedal stroke. There is no need to provide a separate measuring device.

1 is a hydraulic circuit diagram of a vehicle hydraulic brake system according to an embodiment of the present invention.
2 is a control block diagram of a vehicle hydraulic brake system according to an embodiment of the present invention.
3 is a view for explaining a vehicle deceleration mapped according to a pedal stroke and a vehicle speed during vehicle braking in the vehicle hydraulic brake system according to an embodiment of the present invention.
4 is a control flowchart for a method of controlling a vehicle hydraulic brake system according to an embodiment of the present invention.
5 is a control flowchart for explaining sensing of an increase in vehicle weight in the vehicle hydraulic brake system according to an embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. The embodiments introduced below are provided as examples in order to sufficiently convey the spirit of the present invention to those of ordinary skill in the art to which the present invention pertains. The present invention is not limited to the embodiments described below and may be embodied in other forms. In order to clearly explain the present invention, parts irrelevant to the description are omitted from the drawings, and in the drawings, the width, length, thickness, etc. of components may be exaggerated for convenience. Like reference numerals refer to like elements throughout.

In this specification, the expression “and/or” is used to mean including at least one of the elements listed before and after. In addition, the expression “connected/coupled” is used in a sense including being directly connected to another element or indirectly connected through another element. As used herein, the singular also includes the plural, unless the phrase specifically states otherwise. Also, as used herein, a component, step, operation, and element referred to as “comprises” or “comprising” refers to the presence or addition of one or more other components, steps, operations, elements, and devices.

1 is a hydraulic circuit diagram of a vehicle hydraulic brake system according to an embodiment of the present invention.

Referring to FIG. 1 , the vehicle hydraulic braking device is connected to the master cylinder MC through a hydraulic line to receive brake fluid from the master cylinder MC and adjust the supplied brake fluid to the wheel cylinders Wfr and Wrl ,Wfl,Wrr).

In addition, the vehicle hydraulic brake system pumps the brake fluid of the reservoir (LRS) and supplies the hydraulic pumps (HP1, HP2) to each wheel cylinder (Wfr, Wrl, Wfl, Wrr), and to the hydraulic pumps (HP1, HP2). The low-pressure accumulators (LPA1, LPA2) temporarily store the brake fluid pumped by the engine, and the brake fluid supplied from the master cylinder (MC) is supplied to the wheel cylinders (Wfr, Wrl, Wfl, Wrr) or returned to the reservoir (LRS). and solenoid valves TC1, TC2, ESV1, ESV2, IN1 to IN4, and OUT1 to OUT4.

More specifically, the master cylinder (MC) has two chambers, and wheel cylinders (Wfr, Wrl) respectively installed in the first chamber of the master cylinder (MC), the front right wheel (FR) and the rear left wheel (RL). A normally open type traction control valve (TC1) is provided in the hydraulic line between them. The normally open traction control valve TC1 controls the brake fluid delivered from the master cylinder MC to the wheel cylinders Wfr and Wrl of each wheel.

A master cylinder pressure sensor (PS) for sensing the pressure of the master cylinder (MC) is provided on the master cylinder (MC) side.

A normally open type traction control valve TC2 is provided in the hydraulic line between the second chamber of the master cylinder MC and the wheel cylinders Wfl and Wrr respectively installed on the front left wheel FL and the rear right wheel RR. The normally open traction control valve TC2 controls the brake fluid delivered from the master cylinder MC to the wheel cylinders Wfl and Wrr of each wheel FL and RR.

In addition, normally open type solenoid valves (IN1, IN2) are provided in the hydraulic line between the normally open type traction control valve (TC1) and the wheel cylinders (Wfr, Wrl) of each wheel (FR, RL), and the normally open type traction control valve ( Normally open type solenoid valves IN3 and IN4 are provided in the hydraulic line between TC2) and the wheel cylinders Wfl and Wrr of each wheel FL and RR.

In addition, normally closed solenoid valves OUT1 and OUT2 are provided on the outlet side of the wheel cylinders Wfr and Wrl of each wheel FR, RL, and the wheel cylinders Wfl and Wrr of each wheel FL and RR are provided. The normally closed solenoid valves OUT3 and OUT4 are provided on the outlet side.

A low pressure accumulator (LPA1) for temporarily storing the brake fluid discharged from the wheel cylinders (Wfr, Wrl) of each wheel (FR, RL) is provided at the outlet side of the normally closed type solenoid valves (OUT1, OUT2), and the normally closed type solenoid A low pressure accumulator LPA2 for temporarily storing the brake fluid discharged from the wheel cylinders Wfl and Wrr of each wheel FL and RR is provided at the outlet side of the valves OUT3 and OUT4.

Connected to two hydraulic pumps (HP1, HP2) and two hydraulic pumps (HP1, HP2) that pump the brake fluid stored in the low pressure accumulator (LPA1, LPA2) and forcibly reflux to each wheel cylinder (Wfr, Wrl, Wfl, Wrr) side One hydraulic motor M is provided.

On the other hand, normally closed electromagnetic shuttle valves (ESV1, ESV2) are provided in the auxiliary hydraulic line between the suction side of the two hydraulic pumps (HP1, HP2) and each chamber of the master cylinder (MC).

Accordingly, when the normally closed electromagnetic shuttle valves (ESV1, ESV2) are opened, the auxiliary hydraulic line between the master cylinder (MC) and each hydraulic pump (HP1, HP2) is opened, and the normally closed electromagnetic shuttle valves (ESV1, ESV2) are opened. ) is closed, the auxiliary hydraulic line between the master cylinder (MC) and the master cylinder (MC) and each hydraulic pump (HP1, HP2) is closed.

Here, a normally open (NO: Normal Open) valve opens the valve flow path before being energized and closes the valve flow path when energized, and a normally closed (NC: Normal Close) valve closes the valve flow path before energization and closes the valve flow path when energized. open the

When the hydraulic braking force of the wheel cylinders (Wfr, Wrl, Wfl, Wrr) is increased, the apparatus for preventing sudden start of a vehicle according to an embodiment of the present invention operates the normally open solenoid valves (IN1-IN4) according to the command of the electronic control unit (10). is opened and the hydraulic pumps (HP1, HP2) are driven to pump the brake fluid from the reservoir (LRS) or the low pressure accumulator (LPA1, LPA2) through the normally open solenoid valves (IN1-IN4) to the wheel cylinders (Wfr, Wrl, Wfl, Wrr). ) to increase the pressure of the wheel cylinders (Wfr, Wrl, Wfl, Wrr). At this time, the wheel cylinders (Wfr, Wrl, Wfl, Wrr) from the reservoir (LRS) through the hydraulic line connected between the reservoir (LRS) and the hydraulic pumps (HP1, HP2) without going through the hydraulic line on the master cylinder (MC) side. It is possible to supply the pressure directly to the

And when the hydraulic braking force of the wheel cylinders (Wfr, Wrl, Wfl, Wrr) is reduced, according to the command of the electronic control unit 10, the hydraulic pumps (HP1, HP2) are stopped and the normally closed solenoid valves (OUT1-OUT4) are opened. The pressure in the wheel cylinders (Wfr, Wrl, Wfl, Wrr) is reduced by allowing the brake fluid of the wheel cylinders (Wfr, Wrl, Wfl, Wrr) to return to the reservoir (LRS) through the normally closed solenoid valves (OUT1-OUT4). . At this time, the brake fluid discharged from the wheel cylinders Wfr, Wrl, Wfl, and Wrr may be temporarily stored in the low pressure accumulators LPA1 and LPA2.

The normally open traction control valves (TC1, TC2) that are the pressure control valves in Fig. 1, the normally closed electromagnetic shuttle valves (ESV1, ESV2) that are the inflow control valves, the normally open solenoid valves (IN1-IN4) that are the pressure retention valves, pressure reduction The normally closed solenoid valves (OUT1-OUT4), the hydraulic motors (M) that operate the hydraulic pumps (HP1, HP2), etc., which are valves, are controlled by the electronic control unit (ECU) 10, which performs overall control of the vehicle hydraulic brake system. Operated to increase, decrease or maintain the braking pressure of the wheel cylinders of the corresponding wheel.

The wheel speed sensors WS1 to WS4 respectively provided on the left and right front wheels (FL, FR) and the rear left and right wheels (RL, RR) are electrically connected to the electronic control unit (ECU) 10 to provide the detected wheel speed. is connected to

2 is a control block diagram of a vehicle hydraulic brake system according to an embodiment of the present invention.

Referring to FIG. 2 , the vehicle hydraulic braking system includes an electronic control unit 10 that performs overall control. In addition, the vehicle hydraulic braking device includes a wheel speed detecting unit 20 electrically connected to the electronic control unit 10 , a pedal stroke detecting unit 30 , a deceleration detecting unit 40 , a valve driving unit 50 , a motor driving unit 60 and A storage unit 70 may be included.

The wheel speed detection unit 10 , the pedal stroke detection unit 30 , and the deceleration detection unit 40 are electrically connected to the input side of the electronic control unit 10 .

In addition, the valve driving unit 50 and the motor driving unit 60 are electrically connected to the output side of the electronic control unit 10 .

In addition, the storage unit 70 is electrically connected to the input/output side of the electronic control unit 10 .

The wheel speed detection unit 20 detects wheel speeds of front, rear, left, and right wheels. The wheel speed detection unit 20 includes an FR wheel speed detection unit installed on the rim of the right front wheel (FR), a FL wheel speed detection unit installed on the rim of the left front wheel (FL), an RR wheel speed detection unit installed on the rim of the right rear wheel (RR), the left It may include an RL wheel speed detection unit installed on the rim of the rear wheel (RL). Each wheel speed detection unit 10 detects the rotation speed of each wheel and transmits the detected rotation speed of the wheel to the electronic control unit 10 .

The pedal stroke detection unit 30 detects the pedal stroke of the brake pedal BP and transmits the detected pedal stroke to the electronic control unit 10 .

As will be described later, the wheel speed detection unit 20 and the pedal stroke detection unit 30 may constitute a vehicle weight increase amount detection unit that detects the vehicle weight increase amount.

The deceleration detection unit 40 detects the deceleration of the vehicle and transmits it to the electronic control unit 10 .

The valve driving unit 50 includes normally open traction control valves (TC1, TC2), normally closed electronic shuttle valves (ESV1, ESV2), normally open solenoid valves (IN1-IN4) and Drive the normally closed solenoid valves (OUT1-OUT4).

The motor driving unit 60 drives the hydraulic motor M for operating the hydraulic pumps HP1 and HP2.

The valve driving unit 50 and the motor driving unit 60 increase or decrease the hydraulic force applied to the wheel cylinders Wfr, Wrl, Wfl, and Wrr according to the control signal of the electronic control unit 10 to adjust the pressure. , constitutes the hydraulic control units 50 and 60 for generating hydraulic braking force for each wheel by adjusting the braking pressure of the wheel cylinders Wfr, Wrl, Wfl, and Wrr of each wheel.

The storage unit 70 maps and stores vehicle deceleration values according to a plurality of pedal strokes for each vehicle speed.

3 is a view for explaining a vehicle deceleration mapped according to a pedal stroke and a vehicle speed during vehicle braking in the vehicle hydraulic brake system according to an embodiment of the present invention.

Referring to FIG. 3 , respective deceleration values corresponding to the vehicle speed and the pedal stroke are stored in advance.

For example, if the pedal stroke value is 20% at a vehicle speed of 20 km/h, the vehicle deceleration value is “B+10”. If the vehicle speed is the same, the vehicle deceleration value increases as the pedal stroke value increases.

Referring back to FIG. 2 , the reference vehicle weight is stored in the storage unit 70 . For example, the reference vehicle weight may be the weight of a vehicle in which only the driver rides.

In addition, the storage unit 70 stores the motor speed of the hydraulic motor M corresponding thereto for each increase in vehicle weight.

Meanwhile, the storage unit 70 may store an amount of weight corresponding thereto for each deceleration difference. This weight is a value corresponding to an increase in vehicle weight. In this case, the storage unit 70 may store the motor speed of the hydraulic motor M corresponding thereto for each increase in vehicle weight. For example, it may be stored so that the motor speed of the hydraulic motor M increases as the vehicle weight increases. This is because a relatively large auxiliary braking force must be generated as the amount of increase in vehicle weight increases.

Hereinafter, the operation of the electronic control unit 10 will be described.

4 is a control flowchart for a method of controlling a vehicle hydraulic brake system according to an embodiment of the present invention.

Referring to FIG. 4 , the electronic control unit 10 determines whether the vehicle is being braked while driving ( 100 ). In this case, the electronic control unit 10 detects a pedal stroke through the pedal stroke detection unit 30 while the vehicle is driving and determines whether the vehicle is being braked using the detected pedal stroke.

When the vehicle is braking, the electronic control unit 10 detects an increase in vehicle weight (102). The amount of increase in vehicle weight is the amount of weight increased from the reference vehicle weight when the weight of the vehicle when only the driver boards and brakes is referred to as the reference vehicle weight. If a separate device for measuring weight gain is installed, it can be measured directly.

After detecting the increase in vehicle weight, the electronic control unit 10 determines a motor speed corresponding to the detected increase in vehicle weight ( 104 ). At this time, the electronic control unit 10 determines the motor speed corresponding to the detected vehicle weight increase by using the motor speed of the hydraulic motor M stored correspondingly for each vehicle weight increase amount in the storage unit 70 .

After determining the motor speed corresponding to the detected vehicle weight increase, the electronic control unit 10 drives the hydraulic motor M through the motor driving unit 60 according to the motor speed determined to generate the auxiliary braking force (106) . At this time, the electronic control unit 10 drives the hydraulic motor M to reach a motor speed corresponding to the detected vehicle weight increase, and opens the inflow control valves ESV1 and ESV2 through the valve driving unit 50 and While closing the pressure regulating valves TC1 and TC2, the pressure maintaining valves IN1 to IN4 are opened, and the pressure reducing valves OUT1 to OUT4 are closed. Accordingly, the brake fluid flowing in from the master cylinder MC and the brake fluid stored in the low pressure accumulators LPA1 and LPA2 are pumped by the hydraulic pumps HP1 and HP2 operated by the hydraulic motor M, and the wheel cylinder Wfr ,Wrl, Wfl, Wrr), so the pressure of the wheel cylinders (Wfr, Wrl, Wfl, Wrr) is increased. Due to this, an auxiliary braking force is generated in each wheel.

5 is a control flowchart for explaining sensing of an increase in vehicle weight in the vehicle hydraulic brake system according to an embodiment of the present invention.

Referring to FIG. 5 , the electronic control unit 10 detects each wheel speed through each wheel speed detection unit 20 ( 200 ). At this time, after detecting each wheel speed, the electronic control unit 10 detects The vehicle speed is calculated using each wheel speed.

After detecting each wheel speed, the electronic control unit 10 detects the pedal stroke of the brake pedal BP through the pedal stroke detection unit 30 ( 202 ).

After detecting the pedal stroke, the electronic control unit 10 finds the vehicle speed calculated in the storage unit 70 and the vehicle deceleration corresponding to the detected pedal stroke, and determines the found vehicle deceleration as the mapped vehicle deceleration (204) ).

At the same time, the electronic control unit 10 detects the actual vehicle deceleration through the deceleration detection unit 40 ( 206 ).

After detecting the actual vehicle deceleration, the electronic control unit 10 calculates a deceleration difference by subtracting the detected actual vehicle deceleration value from the determined mapped vehicle deceleration value (208).

After calculating the deceleration difference, the electronic control unit 10 finds a weight corresponding to the deceleration difference calculated in the storage unit 70, and determines the found weight as the vehicle weight increase (210).

A large deceleration difference by subtracting the detected actual vehicle deceleration value from the mapped vehicle deceleration value indicates that the vehicle weight increase has increased that much, and a small deceleration difference indicates that the vehicle weight increase has increased by that little. indicates that

When the amount of vehicle weight increase is determined using the deceleration difference obtained by subtracting the detected actual vehicle deceleration value from the mapped vehicle deceleration value, there is no need to separately provide a measuring device for measuring the vehicle weight increase amount.

10: electronic control unit 20: wheel speed detection unit
30: pedal stroke detection unit 40: deceleration detection unit
50: valve driving unit 60: motor driving unit
70: storage

Claims (8)

A vehicle hydraulic braking device for controlling a braking force of a vehicle by increasing a braking pressure of the wheel cylinder by using a hydraulic motor that pumps brake fluid and drives a hydraulic pump that is supplied to the wheel cylinders,
a wheel speed detector for detecting a wheel speed of each wheel;
a pedal stroke detection unit detecting a pedal stroke of a brake pedal;
a deceleration detection unit that detects the deceleration of the vehicle;
a motor driving unit for driving the hydraulic motor; and
At the time of vehicle braking, the vehicle speed according to each wheel speed detected by the wheel speed detection unit and the deceleration of the vehicle corresponding to the reference vehicle weight are determined based on the pedal stroke detected through the pedal stroke detection unit, and the determined vehicle calculating a deceleration difference between the deceleration and the actual deceleration detected through the deceleration detecting unit, determining an increase in vehicle weight according to the calculated deceleration difference, and determining a motor speed according to the determined increase in vehicle weight, and an electronic control unit controlling the hydraulic motor according to the determined motor speed. According to claim 1,
The vehicle speed and the vehicle deceleration corresponding to the pedal stroke are mapped in advance with respect to the reference vehicle weight, and the weight increase amount of the vehicle due to an increase in occupants or cargo compared to the reference vehicle weight to correspond to the deceleration difference and a storage unit stored in advance and storing the motor speed in advance to correspond to an increase in weight of the vehicle. 3. The method of claim 2,
In the storage unit, as the deceleration difference increases, the vehicle's weight increase amount and the motor speed are pre-stored in the storage unit. A method of controlling a vehicle hydraulic brake system for controlling a vehicle's braking force by increasing the braking pressure of the wheel cylinders by using a hydraulic motor that pumps brake fluid and drives a hydraulic pump supplied to the wheel cylinders, the method comprising:
Detects the wheel speed of each wheel and the pedal stroke of the brake pedal when braking the vehicle,
determining the deceleration of the vehicle corresponding to the reference vehicle weight based on the vehicle speed according to the detected wheel speed and the detected pedal stroke,
detecting the actual deceleration of the vehicle,
calculating a deceleration difference between the determined vehicle deceleration and the detected actual deceleration;
Determining an increase in vehicle weight according to the calculated deceleration difference,
Determine the motor speed according to the determined vehicle weight increase,
A control method of a vehicle hydraulic brake system for controlling the hydraulic motor according to the determined motor speed. 5. The method of claim 4,
The vehicle speed and the vehicle deceleration corresponding to the pedal stroke with respect to the reference vehicle weight are mapped in advance in a storage unit,
The determining of the deceleration of the vehicle includes finding a vehicle deceleration corresponding thereto based on the vehicle speed and the detected pedal stroke in the storage unit. 5. The method of claim 4,
An increase in the weight of the vehicle due to an increase in occupants or cargo is stored in advance compared to the reference vehicle weight to correspond to the deceleration difference, and a motor speed is stored in advance in a storage unit to correspond to the increase in weight of the vehicle,
Determining the motor speed is to find a weight increase amount of the vehicle corresponding thereto based on the difference in deceleration in the storage unit, find a motor speed corresponding to the weight increase amount of the found vehicle, and use the found motor speed to the hydraulic pressure A control method of a vehicle hydraulic brake system, comprising determining a motor speed of a motor. A method of controlling a vehicle hydraulic brake system for controlling a vehicle's braking force by increasing the braking pressure of the wheel cylinders by using a hydraulic motor that pumps brake fluid and drives a hydraulic pump supplied to the wheel cylinders, the method comprising:
Detects an increase in vehicle weight due to an increase in occupants or cargo when braking the vehicle,
Determine the motor speed according to the detected weight increase amount of the vehicle,
Including controlling the hydraulic motor according to the determined motor speed,
Detecting the weight increase amount of the vehicle may include detecting each wheel speed and a pedal stroke, determining a vehicle speed according to the detected wheel speed and a vehicle deceleration previously mapped to correspond to the detected pedal stroke, and the vehicle A control method of a vehicle hydraulic brake system for detecting an actual deceleration of the vehicle and determining an increase in weight of the vehicle based on a deceleration difference obtained by subtracting the detected vehicle deceleration from the determined mapped vehicle deceleration. delete

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