US 12,115,963 B2
Apparatus and method for control of a hydraulic brake system including manual pushthrough
Blaise J. Ganzel, Ann Arbor, MI (US)
Assigned to ZF ACTIVE SAFETY US INC., Livonia, MI (US)
Filed by ZF Active Safety US Inc., Livonia, MI (US)
Filed on Aug. 12, 2021, as Appl. No. 17/400,250.
Prior Publication US 2023/0048447 A1, Feb. 16, 2023
Int. Cl. B60T 8/94 (2006.01); B60T 8/176 (2006.01); B60T 8/40 (2006.01); B60T 13/14 (2006.01); B60T 13/58 (2006.01); B60T 13/62 (2006.01); B60T 13/68 (2006.01); B60T 15/02 (2006.01)
CPC B60T 8/94 (2013.01) [B60T 8/176 (2013.01); B60T 13/142 (2013.01); B60T 13/58 (2013.01); B60T 13/62 (2013.01); B60T 13/686 (2013.01); B60T 15/028 (2013.01); B60T 8/4081 (2013.01); B60T 2270/10 (2013.01); B60T 2270/402 (2013.01); B60T 2270/404 (2013.01); B60T 2270/82 (2013.01)] 14 Claims
OG exemplary drawing
 
1. A brake system for selectively actuating at least one of a pair of front wheel brakes and a pair of rear wheel brakes of a vehicle, a selected pair of either the front wheel brakes or the rear wheel brakes being at least partially hydraulically actuated and an other pair of either the front wheel brakes or the rear wheel brakes being at least partially electrically actuated, the system having normal non-failure and backup braking modes, the system comprising:
a reservoir;
a pair of brake motors for selectively electrically actuating respective left and right wheel brakes of the pair of at least partially electrically actuated wheel brakes;
a master cylinder operable to provide a brake signal responsive to actuation of a brake pedal connected thereto, the master cylinder being selectively operable during a manual push-through backup braking mode by actuation of the brake pedal to generate brake actuating pressure at an output for hydraulically actuating at least the selected one of the pairs of front and rear wheel brakes in a manual push-through operation;
a power transmission unit, in fluid communication with the reservoir and at least the selected one of the pairs of front and rear wheel brakes, the power transmission unit being configured to selectively generate pressurized hydraulic fluid for actuating the selected one of the pairs of front and rear wheel brakes during a normal non-failure braking mode;
first and second two-position three-way valves hydraulically connected to respective ones of the selected one of the pairs of front and rear wheel brakes and to both the master cylinder and the power transmission unit, the first and second three-way valves each being configured to selectively switch a respective hydraulically operated brake to receive fluid from a selected one of the master cylinder, in the backup braking mode, and the power transmission unit, in the normal non-failure braking mode;
a first electronic control unit configured to control the power transmission unit, the first three-way valve, the second three-way valve, and/or at least one of the pair of brake motors responsive to the brake signal; and
first and second multiplex control valve arrangements interposed hydraulically between the power transmission unit and the selected one of the pairs of front and rear wheel brakes, the first and second multiplex control valve arrangements each being controlled by the first electronic control unit, and the first and second multiplex control valve arrangements each including respective normally open first and second valves.