Electric brake system

Patent metadata

Field	Value
Publication number	US-9981645-B2
Application number	US-201615298163-A
Country	US
Kind code	B2
Filing date	Oct 19, 2016
Priority date	Oct 19, 2015
Publication date	May 29, 2018
Grant date	May 29, 2018

Abstract

An electric brake system is disclosed. The electric brake system comprises a hydraulic pressure supply device configured to generate hydraulic pressure using a hydraulic piston which is activated by means of an electrical signal that is output corresponding to a displacement of a brake pedal, and including a cylinder block, first and second hydraulic pistons movably accommodated inside the cylinder block, and first and second pressure chambers comparted by the first and second hydraulic pistons, a first hydraulic circuit configured to connect a first hydraulic flow path communicating with the first pressure chamber to one or more wheel cylinders, a second hydraulic circuit configured to connect a second hydraulic flow path communicating with the second pressure chamber to one or more wheel cylinders, and a balance valve configured to open and close a balance flow path connecting the first hydraulic flow path to the second hydraulic flow path.

First claim

What is claimed is:

1. An electric brake system comprising:
a hydraulic pressure supply device configured to generate hydraulic pressure using a hydraulic piston which is activated by means of an electrical signal that is output corresponding to a displacement of a brake pedal, and including a cylinder block, first and second hydraulic pistons movably accommodated inside the cylinder block, and first and second pressure chambers comparted by the first and second hydraulic pistons;
a first hydraulic circuit configured to connect a first hydraulic flow path communicating with the first pressure chamber to one or more wheel cylinders and comprising first and second inlet valves;
a second hydraulic circuit configured to connect a second hydraulic flow path communicating with the second pressure chamber to one or more wheel cylinders and comprising third and fourth inlet valves; and
a circuit balance valve configured to open and close a balance flow path connecting the first hydraulic flow path to the second hydraulic flow path,
wherein the first hydraulic circuit comprises a first balance valve connecting between a first branching flow path having the first inlet valve and a second branching flow path having the second inlet valve, and the second hydraulic circuit comprises a second balance valve connecting between a third branching flow path having the third inlet valve and a fourth branching flow path having the fourth inlet valve.

2. The electric brake system of claim 1 , wherein the first and second inlet valves are configured to open and close a flow path between the first hydraulic flow path and the one or more wheel cylinders, the third and fourth valves are configured to open and close a flow path between the second hydraulic flow path and the one or more wheel cylinders, and the circuit balance flow path connects the first hydraulic flow path to the second hydraulic flow path.

3. The electric brake system of claim 2 , further comprising:
a first dump valve configured to open and close a first dump flow path connecting a first reservoir in which oil is accommodated to the first pressure chamber; and
a second dump valve configured to open and close a second dump path connecting a second reservoir in which oil is accommodated to the second pressure chamber.

4. The electric brake system of claim 3 , wherein the first dump valve is configured with a check valve that allows an oil flow only in a direction from the first reservoir to the first pressure chamber, and the second dump valve is configured with a check valve that allows an oil flow only in a direction from the second reservoir to the second pressure chamber.

5. The electric brake system of claim 3 , wherein the first dump flow path branches between the first pressure chamber of the first hydraulic flow path and the balance flow path, and the second dump flow path branches between the second pressure chamber of the second hydraulic flow path and the balance flow path.

6. The electric brake system of claim 2 , wherein at least one or more of the first hydraulic flow path and the second hydraulic flow path branch into a plurality of flow paths connected to the one or more wheel cylinders, and each of the plurality of branching flow paths include an inlet valve.

7. The electric brake system of claim 1 , wherein the first and second branching flow paths branch from the first hydraulic flow path and are respectively connected to two wheel cylinders, and the third and fourth branching flow paths branch from the second hydraulic flow path and respectively connected to two wheel cylinders, and
wherein the first to fourth inlet valves are configured to open and close each of flow paths between the first to fourth branching flow paths and the wheel cylinders.

8. The electric brake system of claim 7 , wherein the first to fourth branching flow paths which branch from the first hydraulic flow path and the second hydraulic flow path include the first to fourth inlet valves, respectively.

9. The electric brake system of claim 1 , wherein the circuit balance valve is a normally closed type valve that is usually closed and is opened when an opening signal is received.

10. The electric brake system of claim 1 , further comprising:
a master cylinder connected to a reservoir in which oil is stored and configured to discharge the oil according to a pedal effort of the brake pedal;
a simulation device connected to the master cylinder, provided with a simulator valve provided at a flow path connecting a simulation chamber in which oil is accommodated to the reservoir in which the oil is stored, and configured to provide a reaction force according to the pedal effort of the brake pedal; and
an inspection valve configured to open and close a flow path connecting the reservoir to the master cylinder.

11. The electric brake system of claim 10 , wherein a check valve is installed at the flow path connecting the reservoir to the master cylinder to allow an oil flow from the reservoir to the master cylinder and block the oil flow from the master cylinder to the reservoir, and the inspection valve is installed at an inspection flow path that bypasses the check valve.

12. The electric brake system of claim 11 , wherein the simulator valve is provided to open a flow path connecting the simulation chamber to the reservoir in a normal mode, and to block the flow path connecting the simulation chamber to the reservoir in an abnormal mode, and the inspection valve is provided to block the inspection flow path in an inspection mode.

13. The electric brake system of claim 10 , wherein the inspection valve is a normally opened type valve that is usually opened and is closed when a closing signal is received.

14. The electric brake system of claim 1 , wherein the first balance valve is connected to downstream of the first and second inlet valves of the first hydraulic circuit and the second balance valve is connected to downstream of the third and fourth inlet valves of the second hydraulic circuit.

15. The electric brake system of claim 1 , further comprising:
a master cylinder connected to a reservoir in which oil is stored and configured to discharge the oil;
a first cut valve positioned between the master cylinder and downstream of at least one of the first and second inlet valves; and
a second cut valve positioned between the master cylinder and downstream of at least one of the third and fourth inlet valves.

16. The electric brake system of claim 1 , wherein the first branching flow path connects between the first inlet valve and the one or more wheel cylinders, the second branching flow path connects between the second inlet valve and the one or more wheel cylinders, the third branching flow path connects between the third inlet valve and the one or more wheel cylinders, and the fourth branching flow path connects between the fourth inlet valve and the one or more wheel cylinders.

17. The electric brake system of claim 1 , wherein the first and second balance valves are normally opened type valve that is closed when a closing signal is received.

Assignees

• Mando Corp

Inventors

• Kim Hyun-Ho
• Jeon In-Wook

Classifications

• B60T8/348

  4 Channel systems (B60T8/345 takes precedence) · CPC title

• B60T13/745

  acting on a hydraulic system, e.g. a master cylinder · CPC title

• B60T13/146

  Part of the system directly actuated by booster pressure · CPC title

• B60T11/236

  Piston sealing arrangements · CPC title

• B60T13/686 Primary

  in hydraulic systems or parts thereof · CPC title