Method for operating a hydraulic brake system
AssigneeFord Global Technologies, LLC
InventorThomas SVENSSON
Life of this patent
Estimating the term…
Abstract
A method of operating a hydraulic brake system is described. A method of operating a hydraulic brake system of a motor vehicle having a mechatronic brake booster to boost a hydraulic pressure generated in a brake master cylinder of the brake system by a brake pedal of the motor vehicle determines whether a propulsion request is present during operation of the motor vehicle and actuates the mechatronic brake booster when a propulsion request has ended or been substantially reduced. During a predetermined time interval after the propulsion request has ended or been reduced, the mechatronic brake booster is operated at a minimum intensity such that no braking effect occurs during the predetermined time interval, unless a braking request occurs.
Claims22
A method of operating a hydraulic brake system of a motor vehicle having a mechatronic brake booster to boost a hydraulic pressure generated in a brake master cylinder of the brake system by a brake pedal of the motor vehicle, the method comprising:
- determining whether a propulsion request is present during operation of the motor vehicle;
- and
- actuating the mechatronic brake booster when a propulsion request has ended or been substantially reduced;
- wherein, during a predetermined time interval after the propulsion request has ended or been reduced, the mechatronic brake booster is operated at a minimum intensity such that no braking effect occurs during the predetermined time interval, unless a braking request occurs.
A method of operating a hydraulic brake system of a motor vehicle having a mechatronic brake booster, the method comprising:
- during operation of the motor vehicle, monitoring a status of a propulsion request;
- and
- actuating the mechatronic brake booster when a propulsion request has ended or been substantially reduced;
- wherein, during a predetermined time interval after the propulsion request has ended or been reduced, the mechatronic brake booster is operated at a minimum intensity such that no braking effect occurs and stiffness of brake pedal of the motor vehicle is decreased.
A hydraulic brake system of a motor vehicle, comprising:
- a mechatronic brake booster comprising:
- a brake master cylinder configured to generate a hydraulic pressure corresponding to a depression of a brake pedal of a motor vehicle, and
- an electric motor configured to generate an auxiliary braking force for the master cylinder;
- and
- a controller configured to monitor a status of a propulsion request during operation of the motor vehicle;
- wherein the controller is configured to actuate the electric motor at a minimum intensity such that no braking effect occurs when the propulsion request has ended or been substantially reduced.
A method of operating a hydraulic brake system of a motor vehicle having a mechatronic brake booster, the method comprising:
- monitoring a position of an accelerator pedal;
- upon detection of an accelerator pedal release rate threshold, actuating a motor of the mechatronic brake booster;
- closing pressure feed valves in the brake system;
- controlling a speed of the motor to build a head pressure;
- and
- opening the pressure feed valves in response to a braking request or expiration of a predetermined time interval.
The method of clam 14, wherein actuating the motor includes running the motor at a speed of less than 1% of a maximum motor speed.
A hydraulic brake system of a motor vehicle, comprising:
- a mechatronic brake booster including an electric motor;
- at least one wheel brake;
- at least one pressure feed valve configured to control flow of hydraulic brake fluid to the at least one wheel brake;
- and
- a controller configured to run the electric motor and close the at least one pressure feed valve in response to detection of an accelerator pedal release rate threshold.
Dependencies are inferred from the claim text.