Electronic brake system and method for operating same

Patent metadata

Field	Value
Publication number	US-12194969-B2
Application number	US-202017614370-A
Country	US
Kind code	B2
Filing date	Apr 29, 2020
Priority date	May 31, 2019
Publication date	Jan 14, 2025
Grant date	Jan 14, 2025

Abstract

Disclosed is to an electronic brake system. The electronic brake system includes an integrated master cylinder having a simulation chamber, a first master chamber, and a second master chamber arranged in order from a side of a brake pedal, wherein the integrated master cylinder includes a simulation piston provided to be displaceable by the brake pedal to pressurize the simulation chamber, a first master piston configured to pressurize the first master chamber and having a diameter smaller than a diameter of the simulation piston, a second master piston configured to pressurize the second master chamber and having a diameter smaller than a diameter of the first master piston, and an elastic member interposed between the simulation piston and the first master piston to provide the brake pedal with a reaction force.

First claim

The invention claimed is:

1. An electronic brake system comprising:
a reservoir in which a pressurized medium is stored;
an integrated master cylinder having a simulation chamber, a first master chamber, and a second master chamber arranged in order from a side of a brake pedal;
a reservoir flow path communicating the integrated master cylinder with the reservoir;
a hydraulic pressure supply device configured to generate a hydraulic pressure by operating according to an electrical signal output in response to a displacement of the brake pedal;
a first hydraulic circuit and a second hydraulic circuit configured to control a flow of the hydraulic pressure transferred to a wheel cylinder;
a first backup flow path connecting the simulation chamber to the first hydraulic circuit;
a second backup flow path connecting the first master chamber to the second hydraulic circuit; and
an auxiliary backup flow path connecting the second master chamber to the first backup flow path;
and a hydraulic control unit configured to control a flow of the hydraulic pressure transferred to the first hydraulic circuit and the second hydraulic circuit, wherein the integrated master cylinder includes a simulation piston provided to be displaceable by the brake pedal and configured to pressurize the simulation chamber, a first master piston configured to pressurize the first master chamber and having a diameter smaller than a diameter of the simulation piston, a second master piston configured to pressurize the second master chamber and having a diameter smaller than a diameter of the first master piston, and an elastic member interposed between the simulation piston and the first master piston to provide the brake pedal with a reaction force.

2. The electronic brake system according to claim 1 , comprising:
at least one outlet valve provided in the first backup flow path and configured to control a flow of the pressurized medium; and
a cut valve provided in the second backup flow path and configured to control a flow of the pressurized medium.

3. The electronic brake system according to claim 2 , wherein the second backup flow path is connected to an inlet flow path downstream of at least one of two inlet valves of the second hydraulic circuit.

4. The electronic brake system according to claim 3 , wherein the auxiliary backup flow path is provided with an orifice.

5. The electronic brake system according to claim 4 , wherein the at least one outlet valve connected to the first backup flow path is connected in parallel to a check valve for allowing a flow of the pressurized medium from the first backup flow path to the wheel cylinder.

6. The electronic brake system according to claim 2 , further comprising:
a simulation flow path connecting the simulation chamber to the reservoir and provided with a simulator check valve for allowing only a flow of the pressurized medium from the reservoir to the simulation chamber; and
a simulator bypass flow path provided with a simulator valve that is connected in parallel to the simulator check valve and controls bidirectional flows of the pressurized medium.

7. The electronic brake system according to claim 1 , wherein the reservoir flow path includes:
a first reservoir flow path connecting the first master chamber to the reservoir; and
a second reservoir flow path connecting the second master chamber to the reservoir.

8. An electronic brake system comprising:
a reservoir in which a pressurized medium is stored;
an integrated master cylinder having a simulation chamber, a first master chamber, and a second master chamber arranged in order from a side of a brake pedal;
a reservoir flow path communicating the integrated master cylinder with the reservoir;
a hydraulic pressure supply device configured to generate a hydraulic pressure by operating according to an electrical signal output in response to a displacement of the brake pedal;
a first hydraulic circuit and a second hydraulic circuit configured to control a flow of the hydraulic pressure transferred to a wheel cylinder;
and a hydraulic control unit configured to control a flow of the hydraulic pressure transferred to the first hydraulic circuit and the second hydraulic circuit, wherein the integrated master cylinder includes a simulation piston provided to be displaceable by the brake pedal and configured to pressurize the simulation chamber, a first master piston configured to pressurize the first master chamber and having a diameter smaller than a diameter of the simulation piston, a second master piston configured to pressurize the second master chamber and having a diameter smaller than a diameter of the first master piston, and an elastic member interposed between the simulation piston and the first master piston to provide the brake pedal with a reaction force;
wherein the hydraulic pressure supply device includes a first pressure chamber and a second pressure chamber pressurized according to a forward movement and a backward movements, respectively, of a hydraulic piston, wherein the hydraulic control unit comprises:
a first hydraulic flow path in communication with the first pressure chamber;
a second hydraulic flow path in communication with the second pressure chamber;
a third hydraulic flow path at which the first hydraulic flow path and the second third hydraulic flow path join;
a fourth hydraulic flow path branched from the third hydraulic flow path and connected to the first hydraulic circuit;
a fifth hydraulic flow path branched from the third hydraulic flow path and connected to the second hydraulic circuit;
a sixth hydraulic flow path in communication with the first hydraulic circuit;
a seventh hydraulic flow path in communication with the second hydraulic circuit;
an eighth hydraulic flow path at which the sixth hydraulic flow path and the seventh hydraulic flow path join;
a ninth hydraulic flow path branched from the eighth hydraulic flow path and connected to the first pressure chamber; and
a tenth hydraulic flow path branched from the eighth hydraulic flow path and connected to the second pressure chamber.

9. The electronic brake system according to claim 8 , wherein the hydraulic control unit includes:
a first valve provided in the first hydraulic flow path to control a flow of the pressurized medium;
a second valve provided in the second hydraulic flow path to control a flow of the pressurized medium;
a third valve provided in the fourth hydraulic flow path to control a flow of the pressurized medium;
a fourth valve provided in the fifth hydraulic flow path to control a flow of the pressurized medium;
a fifth valve provided in the sixth hydraulic flow path to control a flow of the pressurized medium;
a sixth valve provided in the seventh hydraulic flow path to control a flow of the pressurized medium;
a seventh valve provided in the ninth hydraulic flow path to control a flow of the pressurized medium; and
an eighth valve provided in the tenth hydraulic flow path to control a flow of the pressurized medium.

10. The electronic brake system according to claim 9 , wherein:
the first valve is provided as a check valve for allowing only a flow of the pressurized medium discharged from the first pressure chamber;
the second valve is provided as a check valve for allowing only a flow of the pressurized medium discharged from the second pressure chamber;
the third valve is provided as a check valve for allowing only a flow of the pressurized medium from the third hydraulic flow path toward the first hydraulic circuit;
the fourth valve is provided as a check valve for allowing only a flow of the pressurized medium from the third hydraulic flow path toward the second hydraulic circ

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

• B60T2270/10

  ABS control systems · CPC title

• B60T17/221

  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 title