Brake Assisted Control of an Engine Restart Event
AssigneeFord Global Technologies, LLC
InventorsHai Yu, Mathew A. Boesch, Ryan A. McGee
Life of this patent
Estimating the term…
Abstract
A method for restarting an engine of a vehicle includes engaging a gear of a transmission that driveably connects the engine and wheels of the vehicle; maintaining a current brake pressure greater than a reference brake pressure; initiating an automatic engine restart; using a timer to count down during a period of predetermined length; using a pump to produce a desired magnitude of brake pressure sufficient to suppress a wheel torque surge produced by restarting the engine and to hold the vehicle stationary; and releasing the brake pressure if either the timer expires or a peak in engine speed occurs.
Claims20
A method for restarting an engine of a vehicle, comprising the steps of:
- (a) engaging a gear of a transmission that driveably connects the engine and wheels of the vehicle;
- (b) maintaining a current brake pressure greater than a reference brake pressure;
- (c) initiating an automatic engine restart;
- (d) using a timer to count down during a period of predetermined length;
- (e) using a pump to produce a desired magnitude of brake pressure sufficient to suppress a wheel torque surge produced by restarting the engine and to hold the vehicle stationary;
- (f) releasing the brake pressure.
A method for restarting an engine of a vehicle, comprising the steps of:
- (a) engaging a gear of a transmission that driveably connects the engine and wheels of the vehicle;
- (b) if a current brake pressure is less than a reference brake pressure, using a pump to produce a desired magnitude of brake pressure sufficient to suppress a wheel torque surge due to restarting the engine and to hold the vehicle stationary;
- (c) maintaining brake pressure equal to or greater than the desired brake pressure;
- (d) initiating an automatic engine restart;
- (e) using a timer to count down during a period of predetermined length;
- and
- (f) releasing the brake pressure.
A system for automatically restarting an engine of a vehicle, comprising:
- wheels for propelling the vehicle;
- wheel brakes for alternately holding and releasing rotation of the wheels;
- a brake system for pressurizing the wheel brakes;
- an engine;
- a transmission engaged in a gear through which the engine is driveably connected to the wheels;
- and
- a controller configured to maintain a current brake pressure greater than a reference brake pressure, initiate an automatically engine restart, set a timer to count down during a period of predetermined length, activate a pump to produce a desired magnitude of brake pressure sufficient to suppress a wheel torque surge produced by restarting the engine and to hold the vehicle stationary, and release the brake pressure.
A system for automatically restarting an engine of a vehicle, comprising:
- wheels for propelling the vehicle;
- wheel brakes for alternately holding and releasing rotation of the wheels;
- a brake system for pressurizing the wheel brakes;
- an engine;
- a transmission engaged in a gear through which the engine is driveably connected to the wheels;
- and
- a controller configured to activate a pump to produce a desired magnitude of brake pressure sufficient to suppress a wheel torque surge due to restarting the engine and to hold the vehicle stationary if a current brake pressure is less than a reference brake pressure, maintain brake pressure equal to or greater than the desired brake pressure, initiating an automatic engine restart, set a timer to count down during a period of predetermined length, and release the brake pressure.
Dependencies are inferred from the claim text.