Gm Global Technolgoy Operations, Inc.

Paul D Wilkey

Kevin Gerard Leppek

James A Bright

Michael F Matouka

Robert J Hammersmith

Dennis J Ricker

James J Kowalik

Thomas H Gardner

Yudh V Rajput

Naila Mikhaeil-Boules

Gary Chris Fulks

Schuyler Scott Shaw

Robert J Disser

Michael B Monahan

Jeff Allan Foust

Michael Anthony Dimatteo

A brake system comprising a hydraulic brake, wherein the brake includes a displaceable braking surface, wherein the hydraulic brake requires low pressure to effect displacement during initiation of a brake apply and increased pressure to effect displacement as brake apply progresses, wherein the increased pressure exponentially increases in a non-linear response curve, a motor driven hydraulic actuator having a rotary input provided by a motor and a hydraulic output coupled to the hydraulically actuated brake, wherein the rotary input requires low torque during the initiation of brake apply to effect displacement of the hydraulically actuated brake and requires increased torque to effect rotary motion and displacement of the hydraulically actuated brake as brake apply progresses, the motor characterized by a progressively changing non-linear operation having a low torque mode and a high torque mode, and a control apparatus for the motor controlling the motor to effect displacement of the hydraulic brake, wherein the motor provides increased torque versus displacement in an exponentially increasing non-linear response curve and wherein the motor provides maximum velocity versus displacement in an exponentially decreasing non-linear response curve, wherein the brake system minimizes apply time of the hydraulically actuated brake.

Brake system

A vehicle braking system is provided. In a preferred embodiment the system has an actuator frame with a bore fluidly connected to the wheel brake and to a master cylinder via a solenoid valve. A piston, mounted within the bore, is operationally associated with a non-rotative nut which is threadably engaged by a power screw. To maximize reaction speed, a high efficiency thread is utilized between the power screw and the non-rotative nut. Therefore, pressure within the actuator can back drive the piston. To prevent backdriving of the piston there is a spring locking mechanism.

Anti-lock braking system

A vehicle wheel anti-lock braking system (ABS) is provided including a master cylinder and a wheel brake. A controller cognizant of the rotational condition of the wheel provides a signal when the wheel condition is within preset parameters. An actuator frame is also provided having a bore fluidly communicating with the wheel brake. A piston is mounted within the bore for providing a variable control volume in communication with the wheel brake and for modulating the pressure therein. A reversible motor reciprocally powers the piston. The motor has a rotor with a connected disc. A friction surface is provided for engagement with the disc to lock the position of the piston. A plunger is also provided to urge the friction surface into engagement with the disc. An electromagnetic core, responsive to a signal by the controller, moves the plunger to a position allowing cessation of engagement between the friction surface and the disc thereby allowing rotation of the motor and movement of the piston.

Anti-lock braking system with electromagnetic brake

A vehicle anti-lock braking system is provided. In a preferred embodiment the system has an actuator frame with a bore fluidly connected to the wheel brake and to a master cylinder via a solenoid valve. A piston, mounted within the bore, is operationally associated with a non-rotative nut which is threadably engaged by a power screw. To maximize reaction speed, a high efficiency thread is utilized between the power screw and the non-rotative nut. Therefore, pressure within the actuator can back drive the piston. To prevent backdriving of the piston there is a spring locking mechanism.

A vehicle wheel anti-lock braking system (ABS) is provided including a master cylinder and a wheel brake. An ABS controller cognizant of the rotational condition of the wheel provide a signal when the wheel condition is within preset parameters. An isolation valve responsive to close upon an activation signal given by said controller prevents fluid communication between the master cylinder and the wheel brake. An actuator frame is also provided having a bore fluidly communicating with the wheel brake. A piston is mounted within the bore for providing a variable control volume in communication with said wheel brake for and modulating the pressure therein. A reversible motor reciprocally powers piston. The motor has a rotor with a connected disc. A friction surface is provided for engagement with the disc to lock the position of the piston. A plunger is also provided to urge said friction surface into engagement with said disc. An electromagnetic core, responsive to a signal by said controller, moves the plunger to a position allowing removal of engagement between said friction surface and said disc thereby allowing rotation of the motor and movement of the piston.

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Vandalia, OH, United States of America

Paul D Wilkey