DE102016211064A1 - Electric braking device and control method for this - Google Patents

Abstract

An electric brake device according to the present invention relates to an electronic brake device including a pump unit that is operated based on driving of a motor and a plurality of wheel cylinders each of which receives a fluid pressure generated by the pump unit. The electric brake device includes: a hydraulic circuit disposed between the pump unit and the wheel cylinders; a plurality of wheel valves that regulate fluid flow between the hydraulic circuit and the wheel cylinders; and an electronic control unit that controls the wheel valves and the engine, wherein the electronic control unit controls the wheel valves and the engine based on an input of an operation of a brake pedal by a driver and a need for electronic stability control.

Description

BACKGROUND

1. Field of the invention

The present invention relates to an electric brake system of a vehicle and a control method using the same, and more particularly to an electric brake device capable of reflecting a braking intention of the driver even when the braking power is generated by an electronic stability control (ESC) , and a control method using this.

2. Discussion of the Related Art

More recently, vehicle technologies have evolved in response to increasing consumer demands for eco-friendly technologies.

In addition, various electrical devices are included in the vehicle.

In particular, to improve driver safety, electronic stability control (ESC) systems are widely included in recent vehicles. The ESC system is a device that electronically controls a brake included in each wheel to stably control a vehicle position.

However, a vehicle has a problem that the use of a conventional brake system using a vacuum booster is difficult because the use of a machine is limited. Accordingly, an integrated electrical amplifier is used; however, individual control of two hydraulic circuits therein is theoretically impossible using a fluid pressure source contained therein.

Accordingly, there is a problem that a driver has an unfamiliar feeling.

Thus, there is a need for a method for solving the problems described above.

[Patent Document]

• Korean Patent Registration Number 10-0844670

SUMMARY OF THE INVENTION

The present invention is directed to providing a brake control system of a vehicle and a control method using it to reflect an intention of the driver during concurrent occurrence of driver's intended braking and electronic stability control (ESC) braking in an integrated electric vehicle Amplifier, with an electrical amplifier integrated with an ESC system.

The present invention is also directed to the minimization of unfamiliar sensation while driving by the driver.

The scope of the present invention is not directed to the minimization of unfamiliar sensation while driving by the driver.

The scope of the present invention is not limited to the above-described objects, and other objects not mentioned will be apparent to those skilled in the art from the following description.

According to one aspect of the present invention, there is provided an electric brake device including a pump unit that is driven based on driving a motor and a plurality of wheel cylinders each of which receives a fluid pressure generated by the pump unit. The electric brake device includes: a hydraulic circuit disposed between the pump unit and the wheel cylinders, a plurality of wheel valves that regulate fluid flow between the hydraulic circuit and the wheel cylinders; and an electronic control unit that controls the wheel valves and the engine, wherein the electronic control unit controls the wheel valves and the engine based on an input of a driver who steps on a brake pedal and a need for the ESC.

The electronic control unit may include: a braking determination device that determines a braking intention of the driver based on an output value of a stroke sensor that detects the pedal operation by the driver; an ESC device that determines a need for electrical stability control of a vehicle based on an output from at least one sensor installed in the vehicle, a motor controller that controls the motor based on an output from at least one of the brake determination device and the ESC device controls; and a wheel valve control device that controls the wheel valves based on an output signal from at least one of the brake determination device and the ESC device.

The hydraulic circuit may include: a first hydraulic circuit connecting the pump unit to some of the wheel cylinders and the second hydraulic circuit connecting the pump unit to the other Wheel cylinders connects, and the electronic control unit can perform the control in such a way that the wheel valves of the wheel cylinders, which are connected to the second hydraulic circuit, are opened when an input is detected by a driver stepping on a brake pedal, while a fluid to the Wheel cylinders connected to the first hydraulic circuit for which ESC of the vehicle is delivered.

The hydraulic circuit may include: a first hydraulic circuit connecting the pump unit to some of the wheel cylinders, and the second hydraulic circuit connecting the pump unit to the other wheel cylinders, and the electronic control unit may perform control such that the wheel valves of the wheel cylinders, which are connected to the second hydraulic circuit, are opened when the electronic stability control is required, while a fluid is supplied to the wheel cylinders connected to the first hydraulic circuit to brake a vehicle when an input of a driver stepping on a brake pedal is detected.

According to another aspect of the present invention, there is provided a control method for an electric brake device including a pump unit that is driven based on the driving of a motor and a plurality of wheel cylinders each of which receives a fluid pressure generated by the pump unit. The control method includes: detecting one of an input of a user brake and a need for the ESC of a vehicle; Driving the motor and discharging a fluid into a hydraulic circuit disposed between the pump unit and the wheel cylinders by an electronic control unit; Controlling, by the electronic control unit, a plurality of wheel valves disposed between the hydraulic circuit and the wheel cylinders; and generating braking energy for one of the plurality of wheels based on controlling the plurality of wheel valves. The hydraulic circuit may include a first hydraulic circuit connecting the pump unit to some of the wheel cylinders and the second hydraulic circuit connecting the pump unit to the other wheel cylinders, and the electronic control unit may perform control such that the wheel valves are connected to the second hydraulic circuit Wheel cylinders are opened when an input is detected by a driver stepping on a brake pedal, while a fluid is supplied to the wheel cylinders associated with the first hydraulic circuit for the ESC of the vehicle.

The hydraulic circuit may include a first hydraulic circuit connecting the pump unit and some of the wheel cylinders and the second hydraulic circuit connecting the pump unit and the other wheel cylinders, and the electronic control unit may perform control such that the wheel valves are connected to the second hydraulic circuit wheel cylinders are opened when the electronic stability control is required while a fluid is supplied to the wheel cylinder connected to the first hydraulic circuit to brake a vehicle when an input of a driver stepping on a brake pedal is detected.

The detection of the brake input may include detecting a driver's intention to brake by a stroke sensor that detects an operation of the pedal by the driver.

BRIEF DESCRIPTION OF THE DRAWINGS

The foregoing and other objects, features and advantages of the present invention will become apparent to those skilled in the art upon a detailed description of embodiments thereof with reference to the accompanying drawings, in which:

1 Fig. 11 is a view illustrating each component of an electric brake device according to an embodiment of the present invention;

2 FIG. 12 is a graph showing a wheel pressure while a vehicle is traveling under an electronic stability control (ESC) and a wheel pressure reflecting braking by the driver; FIG.

3 is a view that specifically illustrates an electronic control unit (ECU) in the electric brake device according to an embodiment of the present invention;

4 Fig. 10 is a flowchart illustrating each operation of the control method of the electric brake device according to an embodiment of the present invention;

5 Fig. 10 is a flowchart illustrating an algorithm of the control method for a brake of a vehicle according to an embodiment of the present invention; and

6 FIG. 10 is a flowchart illustrating another algorithm of a brake control method of the vehicle according to an embodiment of the present invention. FIG.

DETAILED DESCRIPTION OF EMBODIMENTS

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the description of the embodiments, the same terms and reference numerals refer to the same components, and a repeated description thereof will be omitted accordingly.

1 FIG. 14 is a view illustrating each component of an electric brake device according to an embodiment of the present invention; FIG. 2 FIG. 12 is a graph showing a wheel pressure while a vehicle is moving under an electronic stability control (ESC) and a wheel pressure reflecting braking by the driver; and FIG 3 FIG. 14 is a view specifically illustrating the electronic control unit (ECU) in the electric brake device according to an embodiment of the present invention.

As in 1 is illustrated, an electric brake device includes a master cylinder 20 , a container 30 , Wheel cylinder 40 , a pedal simulator 50 , a motor 60 , a gear unit 70 and a pump unit 80 ,

The master cylinder 20 is through an entrance bar 12 Pressured when a driver depresses a brake pedal 10 operated, and performs a function of generating a fluid pressure, wherein the generated fluid pressure to the pedal simulator 50 transmitted, the pedal simulator 50 a reaction force over the master cylinder 20 in accordance with the fluid pressure to the brake pedal 10 transmits, and thus the driver is given a brake feel. In addition, in an emergency situation such as when no power is supplied to the entire system, the vehicle may also be due to a direct transmission of the fluid pressure of the master cylinder 20 to the wheel cylinders 40 be slowed down.

In a normal situation, the pump unit transfers 80 a fluid to the wheel cylinders 40 , Strictly speaking, when a driver presses on the brake pedal 10 presses to cause a stroke sensor 11 a displacement of the brake pedal 10 and transfer to the ECU, the ECU transfers the engine 60 based on the displacement of the brake pedal 10 at. If one of the engine 60 generated rotational movement in a rectilinear, reciprocating motion through the gear unit 70 is converted to a piston in the pump unit 80 to press one in a chamber of the pump unit 80 absorbed fluid to the wheel cylinders 40 emotional.

The container 30 is a unit for storing a fluid and is configured with the master cylinder 20 , the pedal simulator 50 and the pump unit 80 to communicate through the fluid. Additionally contains a hydraulic circuit 90 a flow path for transferring a fluid between the pump unit 80 and the wheel cylinders 40 and valves for regulating fluid flow in the flow path.

Such a hydraulic circuit 90 can in a first hydraulic circuit 91 and a second hydraulic circuit 92 be shared. More precisely, the first hydraulic circuit 91 is a circle that is the pump unit 80 with a part of the wheel cylinder 40 connects, and the second hydraulic circuit 92 is a hydraulic circuit that is the remaining pump unit 80 with the remaining part of the wheel cylinder 40 combines. For example, as in 1 Illustrated is a wheel cylinder 40 the rear right (RR) and front left (FL) wheels and the pump unit 80 through the first hydraulic circuit 91 connected, and a wheel cylinder 40 the front right (FR) and the rear left (RL) wheel is through the second hydraulic circuit 92 connected. Several wheel valves 93 . 94 . 95 and 96 that between the hydraulic circuit 90 and the wheel cylinders 40 regulate flowing fluid are between the hydraulic circuit 90 and the wheel cylinders 40 arranged. As in 1 Illustrated is the first wheel valve 93 between the first hydraulic circuit 91 and the wheel cylinder of the RR wheel, the second wheel valve 94 can be between the first hydraulic circuit 91 and the wheel cylinder of the FL wheel, the third wheel valve 95 can be between the second hydraulic circuit 92 and the wheel cylinder of the FR wheel, and the fourth wheel valve 96 can be between the second hydraulic circuit 92 and the wheel cylinder of the RL wheel.

An ECU 100 is a unit that has a function of controlling the drive of the engine 60 for opening and closing the wheel valves. The ECU 100 in the electric brake device according to an embodiment of the present invention controls the wheel valves and the motor 60 based on an input by the driver stepping on a brake pedal and by a need for an ESC.

For example, as in 2 is illustrated when the ECU 100 determines that the ESC is needed while a vehicle is moving, the ECU 100 first the engine 60 to the hydraulic circuit 90 to fill with a fluid, and a pressure in the hydraulic circuit 90 is thereby increased.

Since a present state is a state in which the ESC is performed, an energy piston generates a high pressure in the Hydraulic circuit, as indicated by d1 in the in 2 displayed diagram is displayed, and the target wheel is controlled.

When brake is input by the driver in such a state, the ECU determines 100 the driver's braking intent and calculates brake energy for the driver's braking, as indicated by d2 in the diagram. Then the ECU opens 100 the wheel valves closed by the ESC to produce a fluid pressure as indicated by d3 in the diagram, and accordingly controls the wheels according to the calculated energy of braking by the driver.

Accordingly, according to an embodiment of the present invention, when braking intended by a driver and control by an ESC device occur simultaneously, the advantages are obtained that the driver's braking intention and the turning intention can be reflected and an unfamiliar feeling of the driver can be minimized ,

In order to realize the above-described technical effects, as in 3 Illustrated is the ECU 100 specifically, a brake determination device 110 , an ESC device 120 , a motor control device 130 and a wheel valve control device 140 contain.

The brake determination device 110 performs a function of determining the driver's intention based on an output value of the stroke sensor 11 , which detects a pedal operation by the driver, by.

The ESC device 120 performs a function of determining a necessity of the ESC of the vehicle based on an output from at least one sensor such as a lateral acceleration sensor, an acceleration sensor, a yaw rate sensor, etc. installed in the vehicle.

The engine control device 130 performs a function of controlling the engine 60 on the basis of an output signal from at least one of the brake determination device 110 and the ESC 120 by.

The wheel valve control device 140 controls the wheel valves based on an output signal from at least one of the brake determination device 110 and the ESC device 120 ,

Hereinafter, a control method of the electric brake device according to an embodiment of the present invention with reference to FIGS 4 to 6 described. However, a detailed description overlapping with the already given description for the electric brake device according to an embodiment of the present invention will be omitted. 4 FIG. 10 is a flowchart illustrating each operation of the control method of the electric brake device according to an embodiment of the present invention; FIG. 5 FIG. 11 is a flowchart illustrating an algorithm of the control method for a brake of a vehicle according to an embodiment of the present invention; and FIG 6 FIG. 10 is a flowchart illustrating another algorithm of a brake control method of a vehicle according to an embodiment of the present invention. FIG.

A control method of the electric brake apparatus according to an embodiment of the present invention is related to the control of the pump unit that operates based on the driving of the engine and a plurality of wheel cylinders that receive a fluid pressure generated by the pump unit.

The control method of the electric brake device according to an embodiment of the present invention is mainly divided into four operations as in FIG 4 is illustrated.

First, detection of an input of at least one brake by the user and a necessity of an ESC of a vehicle is performed (S100).

After the operation S100 is performed, the discharge of a fluid to the hydraulic circuit disposed between the pump unit and the wheel cylinder is performed by driving the motor by the ECU (S200). Then, the control of the plurality of wheel valves disposed between the hydraulic circuit and the wheel cylinder is performed by the ECU (S300), and the generation of braking energy for at least one of the plurality of wheels is performed based on the control of the wheel valves (S400).

A case where the ESC is performed while a user is braking, or conversely, the driver's braking intention is detected while the ESC is being performed will be specifically described with reference to FIGS 5 and 6 described. First, as in 5 is illustrated when the ESC is needed while a driver is braking, measuring target braking energy by the stroke sensor, and required braking energy may be independently supplied to each wheel through a non-ESC hydraulic circuit or through control of the wheel valve based on the target braking energy.

In addition, as in 6 is illustrated, when an input is detected by the driver's stepping on a brake pedal under ESC, the target braking energy is measured by the stroke sensor, and a required braking energy can be independently from each wheel through a non-ESC hydraulic circuit or through control of the wheel valve based on the target braking energy to be supplied.

As described above, a brake control system of a vehicle and a control method using the same according to an embodiment of the present invention have the following effects.

First, there is the advantage of being able to reflect braking by a driver and a turning intention when the driver's intended braking and ESC occur simultaneously.

Second, there is also an advantage of minimizing an unfamiliar feeling conveyed to a driver while the driver is driving a vehicle.

The effects of the present invention are not limited to the above-described effects, and other effects not mentioned will be apparent to those skilled in the art from the foregoing description.

The embodiments and drawings given in the description are merely examples for describing a part of a technical concept included in the present invention. Accordingly, it is apparent that the embodiments disclosed in this specification are not intended to limit the concept of the present invention, but to describe the concept that the scope of the concept of the invention is not limited by the embodiments. All modifications and specific embodiments which may be readily made by those skilled in the art within the technical concept contained in the specification and drawings in the present invention fall within the scope of the appended claims.

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• KR 10-0844670 [0008]

Claims (8)

Electric braking device comprising a pump unit ( 80 ) based on the drive of an engine ( 60 ) and several wheel cylinders ( 40 ), each one from the pump unit ( 80 contains), which electric brake device comprises: a hydraulic circuit ( 90 ) between the pump unit ( 80 ) and the wheel cylinders ( 40 ) is arranged; several wheel valves ( 93 . 94 . 95 . 96 ), which is a fluid flow between the hydraulic circuit ( 90 ) and the wheel cylinders ( 40 ) regulate; and an electrical control unit ( 100 ), the wheel valves ( 93 . 94 . 95 . 96 ) and the engine ( 60 ), wherein the electronic control unit ( 100 ) the wheel valves ( 93 . 94 . 95 . 96 ) and the engine ( 60 ) based on an input of a driver stepping on a brake pedal and a need for electronic stability control. Electric braking device according to claim 1, in which the electronic control unit ( 100 ) includes: a brake determination device ( 110 ) which is a braking intention of the driver based on an output value of a stroke sensor ( 11 ) determining the pedal operation by the driver; an electronic stability control device ( 120 ) determining a need for electric stability control of a vehicle based on an output signal from at least one sensor installed in the vehicle; a motor control device ( 130 ), which is the engine ( 60 ) on the basis of an output signal from at least one of the brake determination device ( 110 ) and the electronic stability control device ( 120 ) controls; and a wheel valve control device ( 140 ), the wheel valves ( 93 . 94 . 95 . 96 ) on the basis of an output signal from at least one of the brake determination device ( 110 ) and the electronic stability control device ( 120 ) controls. An electric brake device according to claim 1 or 2, wherein: the hydraulic circuit ( 90 ) a first hydraulic circuit ( 91 ), the pump unit ( 80 ) with some of the wheel cylinders ( 40 ) and a second hydraulic circuit ( 92 ), the pump unit ( 80 ) with the other wheel cylinders ( 40 ) contains; and the electronic control unit ( 100 ) the wheel valves ( 93 . 94 . 95 . 96 ) with the second hydraulic circuit ( 92 ) connected wheel cylinders ( 40 ) controls so that these open when an input to a brake pedal ( 10 ) is detected while a fluid to the with the first hydraulic circuit ( 91 ) associated wheel cylinders ( 40 ) for the electronic stability control of the vehicle. An electronic brake device according to claim 1 or 2, wherein: the hydraulic circuit ( 90 ) a first hydraulic circuit ( 91 ), the pump unit ( 80 ) with some of the wheel cylinders ( 40 ) and a second hydraulic circuit ( 92 ), the pump unit ( 80 ) with the other wheel cylinders ( 40 ) contains; and the electronic control unit ( 100 ) the wheel valves ( 95 . 96 ) with the second hydraulic circuit ( 92 ) connected wheel cylinders ( 40 ) so that they open when the electronic stability control is needed, while a fluid to the with the first hydraulic circuit ( 91 ) associated wheel cylinders ( 40 ) is applied to brake a vehicle when an input to a brake pedal ( 10 ) stepping driver is detected. Control method for an electric brake device comprising a pump unit ( 80 ) based on the drive of an engine ( 60 ) and several wheel cylinders ( 40 ), each one from the pump unit ( 80 ), which control method comprises: detecting one of a brake input of a user and a need for electronic stability control of a vehicle (S100); Driving the engine ( 60 ) and dispensing a fluid into a hydraulic circuit ( 90 ) between the pump unit ( 80 ) and the wheel cylinders ( 40 ) is arranged by an electronic control unit (S200); Control of several wheel valves connected between the hydraulic circuit ( 90 ) and the wheel cylinders ( 40 ) are arranged by the electronic control unit (S300); and generating braking energy for one of a plurality of wheels based on controlling the plurality of wheel valves (S400). Control method according to claim 5, in which: the hydraulic circuit ( 90 ) a first hydraulic circuit ( 91 ), the pump unit ( 80 ) with some of the wheel cylinders ( 40 ) connects, and a second Hydraulic circuit ( 92 ), the pump unit ( 80 ) with the other wheel cylinders ( 40 ) contains; and the electronic control unit ( 100 ) the wheel valves ( 93 . 94 ) with the second hydraulic circuit ( 92 ) connected wheel cylinders ( 40 ) controls so that they open when an input is placed on a brake pedal ( 10 ) is detected while a fluid to the with the first hydraulic circuit ( 91 ) associated wheel cylinders ( 40 ) for the electronic stability control of the vehicle. Control method according to claim 5, in which: the hydraulic circuit ( 90 ) a first hydraulic circuit ( 91 ), the pump unit ( 80 ) with some of the wheel cylinders ( 40 ) and a second hydraulic circuit ( 92 ), the pump unit ( 80 ) with the other wheel cylinders ( 40 ) contains; and the electronic control unit ( 100 ) the wheel valves ( 95 . 96 ) with the second hydraulic circuit ( 92 ) connected wheel cylinders ( 40 ) so that they open when the electronic stability control is needed, while a fluid to the with the first hydraulic circuit ( 91 ) associated wheel cylinders ( 40 ) when an input is made on a brake pedal ( 10 ) stepping driver is detected. A control method according to claim 5 or 6, wherein detecting the input of braking comprises detecting a braking intention of the driver by a stroke sensor (10). 11 ), which detects a pedal operation of the driver contains.

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