Electronic brake system and operation method

Patent metadata

Field	Value
Publication number	US-12049207-B2
Application number	US-202017614284-A
Country	US
Kind code	B2
Filing date	Apr 29, 2020
Priority date	May 31, 2019
Publication date	Jul 30, 2024
Grant date	Jul 30, 2024

Abstract

Disclosed herein an electronic brake system includes a hydraulic pressure supply device including a first pressure chamber and a second pressure chamber partitioned by a hydraulic piston, and a hydraulic control unit, wherein the hydraulic control unit comprises a first hydraulic flow path connecting the first pressure chamber and one of the first and second hydraulic circuits, a second hydraulic flow path branched from the first hydraulic flow path to connect to the other one of the first and second hydraulic circuits, a third hydraulic flow path branched from the first hydraulic flow path on upstream side of a branch point of the second hydraulic flow path to connect the second pressure chamber, and a fourth hydraulic flow path branched from the first hydraulic flow path on upstream side of a branch point of the third hydraulic flow path to connect the third hydraulic flow path.

First claim

The invention claimed is:

1. An electronic brake system, comprising:
a reservoir configured to store a pressure medium;
an integrated master cylinder including a master chamber and a simulation chamber;
a reservoir flow path configured to communicate the integrated master cylinder with the reservoir;
a hydraulic pressure supply device including a first pressure chamber and a second pressure chamber partitioned by a hydraulic piston moving in a cylinder block by an electrical signal output in response to a displacement of a brake pedal, the first pressure chamber positioned at a forward side of the hydraulic piston and the second pressure chamber positioned at a backward side of the hydraulic piston;
a first hydraulic circuit and a second hydraulic circuit configured to control hydraulic pressure of wheel cylinders; and
a hydraulic control unit configured to control a flow of the hydraulic pressure provided from the hydraulic pressure supply device to the first and second hydraulic circuits;
wherein the hydraulic control unit comprises:
a first hydraulic flow path connecting the first pressure chamber and one of the first and second hydraulic circuits and configured to provide the hydraulic pressure of the first pressure chamber to one of the first and second hydraulic circuits;
a second hydraulic flow path branched from the first hydraulic flow path to connect to the other one of the first and second hydraulic circuits and configured to provide the hydraulic pressure of the first hydraulic flow path to the other one of the first and second hydraulic circuits;
a third hydraulic flow path branched from the first hydraulic flow path on upstream side of a branch point of the second hydraulic flow path to connect the second pressure chamber and configured to provide the hydraulic pressure of the second pressure chamber to the first hydraulic flow path; and
a fourth hydraulic flow path branched from the first hydraulic flow path on upstream side of a branch point of the third hydraulic flow path to connect the third hydraulic flow path and configured to flow selectively the pressure medium between the first pressure chamber and the second pressure chamber.

2. The electronic brake system of claim 1 ,
wherein the hydraulic control unit comprises:
a first valve provided in the first hydraulic flow path between respective branch points of the third and fourth hydraulic flow paths to control the flow of the pressure medium;
a second valve provided in the second hydraulic flow path to control the flow of the pressure medium;
a third valve provided in the third hydraulic flow path on upstream side of a junction of the third and fourth hydraulic flow paths to control the flow of the pressure medium; and
a fourth valve provided in the fourth hydraulic flow path to control the flow of the pressure medium.

3. The electronic brake system of claim 2 , wherein
the first valve comprises a check valve allowing only a flow of the pressure medium from the hydraulic pressure supply device toward the wheel cylinders, and
each of the second to fourth valves comprises a solenoid valve for controlling a bidirectional flow of the pressure medium.

4. The electronic brake system of claim 1 , wherein
the integrated master cylinder comprises:
a master piston provided to be displaceable by the brake pedal and pressurizing the master chamber;
a simulation piston provided to be displaceable by the hydraulic pressure of the pressure medium accommodated in the master chamber and pressurizing the simulation chamber; and
an elastic member provided in the simulation chamber and providing a reaction force to the simulation piston;
wherein the master piston, the simulation piston, and the elastic member are sequentially arranged in a line in the cylinder block of the integrated master cylinder.

5. The electronic brake system of claim 4 , further comprising:
a first backup flow path connecting the master chamber and the first hydraulic circuit and including a first cut valve configured to control the flow of the pressure medium; and
a second backup flow path connecting the simulation chamber and the second hydraulic circuit and including a second cut valve configured to control the flow of the pressure medium.

6. The electronic brake system of claim 5 , wherein
the reservoir flow path comprises:
a first reservoir flow path connecting the reservoir and the master chamber; and
a second reservoir flow path connecting the reservoir and the simulation chamber.

7. The electronic brake system of claim 6 , further comprising:
a simulation flow path connecting the second backup flow path and the second reservoir flow path;
a simulator valve provided in the simulation flow path to control the flow of the pressure medium in the simulation flow path; and
a simulator bypass flow path connected in parallel with the simulator valve on the simulation flow path and provided with a simulator check valve allowing only a flow of the braking fluid transmitted from the second reservoir flow path to the second backup flow path.

8. The electronic brake system of claim 5 , wherein the first hydraulic circuit comprises:
first and second inlet flow paths branched from the second hydraulic flow path to connect to first and second wheel cylinders, respectively, the first and second inlet flow paths including first and second inlet valves, respectively;
first and second inlet bypass flow paths connected in parallel to the first and second inlet valves on the first and second inlet flow paths, respectively, and provided with first and second check valves allowing only the flow of the pressure medium toward the second hydraulic flow path;
first and second outlet flow paths branched from the first and second inlet flow paths on downstream side of the first and second inlet valves, respectively to connect to the reservoir, and provided with first and second outlet valves, respectively.

9. The electronic brake system of claim 8 , wherein the second hydraulic circuit comprises:
third and fourth inlet flow paths branched from the first hydraulic flow path to connect to third and fourth wheel cylinders, respectively, the third and fourth inlet flow paths including third and fourth inlet valves, respectively;
third and fourth inlet bypass flow paths connected in parallel to the third and fourth inlet valves on the third and fourth inlet flow paths, respectively, and provided with third and fourth check valves allowing only the flow of the pressure medium toward the first hydraulic flow path;
third and fourth outlet flow paths branched from the third and fourth inlet flow paths on downstream side of the third and fourth inlet valves, respectively to connect to the second backup flow path.

10. The electronic brake system of claim 9 , further comprising:
a dump flow path connecting between the first pressure chamber and the reservoir and provided with a dump check valve allowing only the flow of the pressure medium toward the first pressure chamber; and
a dump bypass flow path connected in parallel to the dump check valve on the dump flow path and provided with a dump valve configured to control the flow of the pressure medium.

11. The electronic brake system of claim 3 , wherein
the hydraulic control unit further comprises a fifth hydraulic flow path connecting the third hydraulic flow path and the second hydraulic flow path so as to provide the pressure medium of the third hydraulic flow path to the other one of the first and second hydraulic circuits.

12. The electronic brake system of claim 11 , wherein
the hydraulic control unit further comprises a fifth valve provided in the fifth hydraulic flow p

Assignees

• Hl Mando Corp

Inventors

• Kim Jin Seok
• Choi Seong Ho

Classifications

• B60T2270/82

  Brake-by-Wire, EHB · CPC title

• B60T2270/404

  Brake-by-wire or X-by-wire failsafe · CPC title

• B60T2270/402

  Back-up · CPC title

• B60T17/04

  Arrangements of piping, valves in the piping, e.g. cut-off valves, couplings or air hoses (traction couplings involving joints for supply lines, electric circuits, or the like B60D1/62; couplings peculiar to railway vehicles for, or combined with, couplings or connectors for fluid conduits or electric cables B61G5/06; pipes, cut-off valves, couplings, air hoses per se F16C, F16K, F16L) · CPC title

• B60T13/148

  Arrangements for pressure supply · CPC title