Apparatus and method for redundant control of a hydraulic brake system

Patent metadata

Field	Value
Publication number	US-2023001908-A1
Application number	US-202117366623-A
Country	US
Kind code	A1
Filing date	Jul 2, 2021
Priority date	Jul 2, 2021
Publication date	Jan 5, 2023
Grant date	—

Abstract

A brake system for selectively actuating at least one of a pair of front wheel brakes and a pair of rear wheel brakes includes a reservoir and a power transmission unit configured for selectively providing pressurized hydraulic fluid for actuating at least a selected one of the wheel brakes during a braking event. The power transmission unit includes an electric motor for selectively actuating a fluid pressurization cycle. The electric motor is a dual-wound electric motor having first and second windings. A first electronic control unit is provided for selectively controlling the first windings of the electric motor of the power transmission unit. A second electronic control unit is provided for selectively controlling the second windings of the electric motor of the power transmission unit. An isolation valve and a dump valve are associated with each wheel brake.

First claim

What is claimed is:

1 . A brake system for selectively actuating at least one of a pair of front wheel brakes and a pair of rear wheel brakes, the system comprising:
a reservoir; a power transmission unit configured for selectively providing pressurized hydraulic fluid for actuating at least a selected one of the wheel brakes during a braking event, the power transmission unit including an electric motor for selectively actuating a fluid pressurization cycle, the electric motor being a dual-wound electric motor having first and second windings; a first electronic control unit for selectively controlling the first winding of the electric motor of the power transmission unit; a second electronic control unit for selectively controlling the second winding of the electric motor of the power transmission unit; and an isolation valve and a dump valve associated with each wheel brake, the isolation valve being located hydraulically between a respective wheel brake and the power transmission unit, and the dump valve being located hydraulically between a respective wheel brake and the reservoir, for the corresponding wheel brake.

2 . The brake system of claim 1 , including a replenishing check valve, a normally open DAP valve, and a normally closed DAP valve located fluidically between the reservoir and the power transmission unit for assisting with refilling of the power transmission unit under predetermined conditions.

3 . The brake system of claim 2 , wherein the normally open and normally closed DAP valves are each of a dual-wound type, including first and second valve windings, wherein the first electronic control unit controls the first valve windings and the second electronic control unit controls the second valve windings.

4 . The brake system of claim 2 , wherein the isolation valves and dump valves are each of a dual-wound type, including first and second valve windings, wherein the first electronic control unit controls the first valve windings and the second electronic control unit controls the second valve windings.

5 . The brake system of claim 1 , including a brake pedal connected to a brake pedal unit and selectively actuated by a driver of the vehicle to indicate a desired braking command, the brake pedal unit having a travel sensor for determining a position of the brake pedal and responsively producing a braking signal corresponding to the desired braking command, the braking signal being transmitted to at least one of the first and second electronic control units, and the at least one of the first and second electronic control units controlling a respective first or second winding of the power transmission unit responsive to the braking signal.

6 . The brake system of claim 5 , wherein the braking signal is wirelessly transmitted to the at least one of the first and second electronic control units.

7 . The brake system of claim 1 , including:
a master cylinder operable during a manual push-through mode by actuation of a brake pedal connected to the master cylinder to generate brake actuating pressure at first and second outputs for hydraulically actuating at least a selected one of a pair of front wheel brakes and a pair of rear wheel brakes during the manual push-through mode; first and second three-way valves selectively controlling hydraulic fluid flow from a chosen one of the master cylinder and the power transmission unit to respective ones of the pairs of wheel brakes; and a replenishing check valve, a normally open DAP valve, and a normally closed DAP valve located fluidically between the reservoir and the power transmission unit for assisting with refilling of the power transmission unit under predetermined conditions; wherein the isolation valve for each wheel brake is located hydraulically between a respective wheel brake and the three-way valve, and the dump valve for each wheel brake is located hydraulically between a respective wheel brake and the reservoir.

8 . The brake system of claim 7 , wherein each three-way valve is configured to selectively switch the brake system between manual push-through mode and the boosted braking mode.

9 . The brake system of claim 7 , including a simulator test valve located fluidically between the reservoir and the master cylinder.

10 . The brake system of claim 7 , wherein the normally open and normally closed DAP valves are each of a dual-wound type, including first and second valve windings, wherein the first electronic control unit controls the first valve windings and the second electronic control unit controls the second valve windings.

11 . The brake system of claim 7 , wherein the isolation valves and dump valves are each of a dual-wound type, including first and second valve windings, wherein the first electronic control unit controls the first valve windings and the second electronic control unit controls the second valve windings.

12 . The brake system of claim 7 , wherein the three-way valves are of a dual-wound type, including first and second valve windings, wherein the first electronic control unit controls the first valve windings and the second electronic control unit controls the second valve windings.

Assignees

• Zf Active Safety Us Inc
• Zf Active Safety Gmbh

Inventors

• Einig Frank
• Ganzel Blaise J
• Alford Nicholas

Classifications

• B60T17/222

  by filling or bleeding of hydraulic systems · CPC title

• B60T7/042

  by electrical means, e.g. using travel or force sensors · CPC title

• B60T13/686

  in hydraulic systems or parts thereof · CPC title

• B60T13/745 Primary

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

• B60T2270/413

  Plausibility monitoring, cross check, redundancy · CPC title