US 12,252,102 B2
Brake system with fluid storage secondary brake module
Blaise 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 Feb. 9, 2022, as Appl. No. 17/667,835.
Claims priority of provisional application 63/300,773, filed on Jan. 19, 2022.
Prior Publication US 2023/0227016 A1, Jul. 20, 2023
Int. Cl. B60T 13/68 (2006.01); B60T 8/176 (2006.01); B60T 8/32 (2006.01); B60T 13/14 (2006.01); B60T 13/62 (2006.01); B60T 8/40 (2006.01)
CPC B60T 13/686 (2013.01) [B60T 8/176 (2013.01); B60T 8/326 (2013.01); B60T 13/142 (2013.01); B60T 13/62 (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); B60T 2270/88 (2013.01)] 19 Claims
OG exemplary drawing
 
1. A brake system for actuating at least one wheel brake of a pair of front wheel brakes and a pair of rear wheel brakes, the system comprising:
a reservoir;
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 mode by actuation of the brake pedal to generate brake actuating pressure to at least one output for hydraulically actuating at least one wheel brake;
a power transmission unit configured for selectively providing pressurized hydraulic fluid for actuating at least one of the wheel brakes in a non-failure normal braking mode;
a secondary braking module configured for selectively providing hydraulic fluid to each of the wheel brakes in an enhanced braking mode, each wheel brake having an associated fluid accumulator, the secondary braking module including a pump motor driving at least one pump unit associated with a correlated wheel brake, each pump unit being operatively connected to the fluid accumulator associated with the correlated wheel brake for selectively varying an amount of hydraulic fluid provided to the correlated wheel brake;
a primary electronic control unit for controlling the power transmission unit responsive to the brake signal;
a secondary electronic control unit for controlling the pump motor responsive to the brake signal;
first and second two-position three-way valves, each of the first and second three-way valves being hydraulically connected with the master cylinder, the power transmission unit, and at least a selected wheel brake, the 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 at least the selected wheel brake;
an isolation and dump control valve arrangement hydraulically interposed between at least one of the first and second three-way valves and at least the selected wheel brake; and
a parallel isolation valve arrangement hydraulically interposed between a selected pump unit and a corresponding wheel brake.