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US 9,174,616 B2Granted
Electronic brake system line lock feature
AssigneeContinental Automotive Systems, Inc.
InventorsSeth Michael Taylor, Clinton Schumann, Andrew Knepper, Kurt Myers Branson
Life of this patent
Estimating the term…
Abstract
A method applying a line lock feature, i.e. a wheel hold mode, with a brake system for a vehicle comprises initiating a wheel hold mode for the brake system and applying pressure to the wheels of a non-driven axle. The wheel brake pressure is maintained at the wheels of the non-driven axle independent of application of the brake pedal. The wheel brake pressure at the wheels of the non-driven axle is released when a release trigger event occurs. The release trigger event may be an automatic trigger event or a driver actuated trigger event.
Claims18
A method of operating a brake system comprising:
- providing a hydraulic dual-circuit brake control that includes a master brake cylinder with a brake pedal that communicates with the master brake cylinder, at least one pump for generating brake fluid pressure in the hydraulic pressure in the hydraulic dual-circuit brake control, at least one non-driven wheel brake with an inlet valve disposed in an inlet line having a spring-actuated open position and an electromagnetically switchable blocking position;
- providing an outlet valve with a spring actuated blocking position and an electromagnetically switchable open position, wherein the outlet valve is located in a return line leading back to the at least one pump;
- providing a shut-off valve connected between the pump, brake master cylinder, and the inlet valve, wherein the shut-off valve also has a spring actuated open position and an electromagnetically switchable blocking position;
- depressing the brake pedal and initiating a wheel hold mode in an ECU (Electronic Control Unit) for the brake system;
- applying pressure to the at least one non-driven wheel brake;
- accumulating pressure at the at least one non-driven wheel brake and maintaining the pressure by moving the inlet valve to the closed position, moving the shut-off valve to the blocking position that will modulate and maintain pressure buildup in the brake system downstream of the shut-off valve;
- maintaining wheel brake pressure at the at least one non-driven wheel brake;
- independent of application of the brake pedal;
- and
- releasing the wheel brake pressure at the at least one non-driven wheel brake when a release trigger event occurs, wherein the release trigger event is one of:
- an automatic trigger event and a driver actuated trigger event, wherein the step of releasing the wheel brake pressure includes actuating the outlet valve to move the outlet valve to the open position so that the accumulating pressure is reduced by moving the pressure through the return line.
8 more elements
A brake system comprising:
- a hydraulic dual-circuit brake control that includes at least one pump for generating brake fluid pressure in the hydraulic-dual circuit brake control, a master brake cylinder with a brake pedal communicating with the master brake cylinder;
- a plurality of wheel brakes connected to the master cylinder to apply a brake pressure at each of a plurality of vehicle wheels, wherein the plurality of wheel brakes include at least one non-driven wheel brake;
- an inlet valve disposed in an inlet line having a spring actuated open position and an electromagnetically switchable blocking position;
- an outlet valve with a spring actuated blocking position and an electromagnetically switchable open position, wherein the outlet valve is located in a return line leading back to the at least one pump;
- a shut-off valve also having a spring actuated open position and an electromagnetically switchable blocking position;
- and
- an electronic control unit connected to the master cylinder to control pressure within the brake system the electronic control unit including instructions for:
- initiating a wheel hold mode for the brake system;
- applying pressure to the at least one non-driven wheel brake;
- accumulating pressure at the at least one non-driven wheel brake and maintaining the pressure by moving the inlet valve to the blocking position, moving the shut-off valve to the blocking position that will modulate and maintain pressure buildup in the brake system downstream of the shut-off valve;
- maintaining wheel brake pressure at the at least one non-driven wheel brake independent of application of the brake pedal;
- and
- releasing the wheel brake pressure at the at least one non-driven wheel brake when a release trigger event occurs, wherein the release trigger event is one of:
- an automatic trigger event and a driver actuated trigger event, wherein the step of releasing the wheel brake pressure includes actuating the outlet valve to move the outlet valve to the open position so that the accumulating pressure is reduced by moving the pressure through the return line.
11 more elements
Dependencies are inferred from the claim text.