ELECTRONIC BRAKE SYSTEM AND CONTROL METHOD THEROF

• US 20180339692A1
• Filed: 05/23/2018
• Published: 11/29/2018
• Est. Priority Date: 05/23/2017
• Status: Active Grant

• Current Assignee: HL Mando Corporation (Halla Holdings Corporation)
• Original Assignee: Mando Corporation (Halla Holdings Corporation)
• Inventors: JEONG, Hyojin
• Granted Patent: US 10,696,286 B2
• Time in Patent Office: Days
• CPC Class Codes: B60T 11/26 Reservoirs integral with master controls B60T11/22
• CPC Class Codes: B60T 13/142 Systems with master cylinder
• CPC Class Codes: B60T 13/146 Part of the system directly actuated by booster pressure
• CPC Class Codes: B60T 13/662 characterised by specified functions of the control system components
• CPC Class Codes: B60T 13/686 in hydraulic systems or parts thereof
• CPC Class Codes: B60T 13/745 acting on a hydraulic system, e.g. a master cylinder
• CPC Class Codes: B60T 17/22 Devices for monitoring or checking brake systems; Signal devices
• CPC Class Codes: B60T 17/221 Procedure or apparatus for checking or keeping in a correct functioning condition of brake systems hydraulic pressure systems in general F15B19/00, F15B21/04; testing structures or apparatus G01M
• CPC Class Codes: B60T 2220/04 Pedal travel sensor, stroke sensor; Sensing brake request
• CPC Class Codes: B60T 2270/402 Back-up
• CPC Class Codes: B60T 2270/403 Brake circuit failure
• CPC Class Codes: B60T 2270/82 Brake-by-Wire, EHB
• CPC Class Codes: B60T 7/042 by electrical means, e.g. using travel or force sensors
• CPC Class Codes: B60T 8/00 Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force by changing number of effective brake cylinders in power brake systems B60T17/10
• CPC Class Codes: B60T 8/171 Detecting parameters used in the regulation; Measuring values used in the regulation
• CPC Class Codes: B60T 8/172 Determining control parameters used in the regulation, e.g. by calculations involving measured or detected parameters B60T8/17551 takes precedence
• CPC Class Codes: B60T 8/4081 Systems with stroke simulating devices for driver input B60T8/4077 takes precedence

Abstract

Disclosed are an electronic brake system and a control method thereof. The electronic brake system and the control method thereof include a reservoir in which oil is stored; a master cylinder connected to the reservoir and discharging oil according to a pedal effort of a brake pedal; a hydraulic pressure supply apparatus which is operated by an electrical signal corresponding to the pedal effort to generate a hydraulic pressure; a hydraulic control unit configured to be separated into a first hydraulic circuit and a second hydraulic circuit so as to transmit the hydraulic pressure discharged from the hydraulic pressure supply apparatus to wheel cylinders provided on two wheels, respectively; and a first hydraulic passage pressure sensor for sensing the hydraulic pressure of the first hydraulic circuit and a second hydraulic passage pressure sensor for sensing the hydraulic pressure of the second hydraulic circuit, the reservoir includes a first reservoir chamber connected to recover oil dumped from the first hydraulic circuit, a second reservoir chamber connected to supply oil to the hydraulic pressure supply apparatus, and a third reservoir chamber connected to recover oil dumped from the second hydraulic circuit, and the first reservoir chamber and the third reservoir chamber are separately provided.

Claims

1. An electronic brake system comprising:

a reservoir in which oil is stored;

a master cylinder connected to the reservoir and discharging oil according to a pedal effort of a brake pedal;

a hydraulic pressure supply apparatus which is operated by an electrical signal corresponding to the pedal effort to generate a hydraulic pressure;

a hydraulic control unit configured to be separated into a first hydraulic circuit and a second hydraulic circuit so as to transmit the hydraulic pressure discharged from the hydraulic pressure supply apparatus to wheel cylinders provided on two wheels, respectively; and

a first hydraulic passage pressure sensor for sensing the hydraulic pressure of the first hydraulic circuit and a second hydraulic passage pressure sensor for sensing the hydraulic pressure of the second hydraulic circuit,

wherein the reservoir is configured such that a reservoir chamber connected to recover oil dumped from the first hydraulic circuit and a reservoir chamber connected to recover oil dumped from the second hydraulic circuit are separated from each other in the reservoir.

2. The electronic brake system according to claim 1,

wherein the reservoir comprises a first reservoir chamber connected to recover oil dumped from the first hydraulic circuit, a second reservoir chamber connected to supply oil to the hydraulic pressure supply apparatus, and a third reservoir chamber connected to recover oil dumped from the second hydraulic circuit, and

wherein the first reservoir chamber and the third reservoir chamber are separately provided.

3. The electronic brake system according to claim 1, further comprising:

a motor control sensor for sensing the drive of a motor provided in the hydraulic pressure supply apparatus; and

an electronic control unit for sensing an oil leak generated in the first hydraulic circuit and the second hydraulic circuit with the first hydraulic passage pressure sensor and the second hydraulic passage pressure sensor upon sensing the drive of the motor.

4. The electronic brake system according to claim 3,

wherein the electronic control unit determines that the hydraulic pressure is leaked when the pressure received from the first hydraulic passage pressure sensor or the second hydraulic passage pressure sensor is lower than a minimum pressure preset in each of the first and second hydraulic pressure circuits.

5. The electronic brake system according to claim 1,

wherein the hydraulic control unit comprises inlet valves provided on flow passages connecting the hydraulic pressure supply apparatus and the wheel cylinders to transmit a hydraulic pressure discharged from the hydraulic pressure supply apparatus to the wheel cylinder provided on each wheel, and outlet valves provided on flow passages connecting between the wheel cylinders and the reservoir, and

wherein the electronic control unit closes the inlet valves in the leaked hydraulic circuit when a leak occurs in one of the first hydraulic circuit and the second hydraulic circuit, and transmits the hydraulic pressure to the wheel cylinders with the other hydraulic circuit that is not leaked.

6. The electronic brake system according to claim 2,

wherein the master cylinder comprises first and second master chambers, and first and second pistons provided in the respective master chambers, and

wherein the first reservoir chamber is connected to the first master chamber, and the second reservoir chamber is connected to the second master chamber.

7. A method of controlling the electronic brake system according to claim 1, comprising:

determining whether hydraulic pressure in the first hydraulic circuit and the second hydraulic circuit of the hydraulic control unit are in a normal state; and

transmitting a braking pressure to the wheel cylinders corresponding to the other hydraulic circuit having the hydraulic pressure in a normal state if it is determined that the hydraulic pressure in one of the first hydraulic circuit and the second hydraulic circuit is in an abnormal state.

8. The method of controlling the electronic brake system according to claim 7,

wherein the hydraulic control unit comprises inlet valves provided on flow passages connecting the hydraulic pressure supply apparatus and the wheel cylinders to transmit a hydraulic pressure discharged from the hydraulic pressure supply apparatus to the wheel cylinder provided on each wheel, and outlet valves provided on flow passages connecting between the wheel cylinders and the reservoir, and

wherein the electronic control unit closes the inlet valves in the leaked hydraulic circuit when a leak occurs in one of the first hydraulic circuit and the second hydraulic circuit, and transmits the hydraulic pressure to the wheel cylinders with the other hydraulic circuit that is not leaked

9. A method of controlling the electronic brake system according to claim 2, comprising:

determining whether hydraulic pressure in the first hydraulic circuit and the second hydraulic circuit of the hydraulic control unit are in a normal state; and

transmitting a braking pressure to the wheel cylinders corresponding to the other hydraulic circuit having the hydraulic pressure in a normal state if it is determined that the hydraulic pressure in one of the first hydraulic circuit and the second hydraulic circuit is in an abnormal state.

10. A method of controlling the electronic brake system according to claim 3, comprising:

determining whether hydraulic pressure in the first hydraulic circuit and the second hydraulic circuit of the hydraulic control unit are in a normal state; and

transmitting a braking pressure to the wheel cylinders corresponding to the other hydraulic circuit having the hydraulic pressure in a normal state if it is determined that the hydraulic pressure in one of the first hydraulic circuit and the second hydraulic circuit is in an abnormal state.

11. A method of controlling the electronic brake system according to claim 4, comprising:

determining whether hydraulic pressure in the first hydraulic circuit and the second hydraulic circuit of the hydraulic control unit are in a normal state; and

transmitting a braking pressure to the wheel cylinders corresponding to the other hydraulic circuit having the hydraulic pressure in a normal state if it is determined that the hydraulic pressure in one of the first hydraulic circuit and the second hydraulic circuit is in an abnormal state.

12. A method of controlling the electronic brake system according to claim 5, comprising:

determining whether hydraulic pressure in the first hydraulic circuit and the second hydraulic circuit of the hydraulic control unit are in a normal state; and

transmitting a braking pressure to the wheel cylinders corresponding to the other hydraulic circuit having the hydraulic pressure in a normal state if it is determined that the hydraulic pressure in one of the first hydraulic circuit and the second hydraulic circuit is in an abnormal state.

13. A method of controlling the electronic brake system according to claim 6, comprising:

determining whether hydraulic pressure in the first hydraulic circuit and the second hydraulic circuit of the hydraulic control unit are in a normal state; and

transmitting a braking pressure to the wheel cylinders corresponding to the other hydraulic circuit having the hydraulic pressure in a normal state if it is determined that the hydraulic pressure in one of the first hydraulic circuit and the second hydraulic circuit is in an abnormal state