Active compensation system
AssigneeITT Corporation
InventorThomas J. Hall
Life of this patent
Estimating the term…
Abstract
An active compensation system for an anti-locking brake system eliminates undesirable brake fluid pressure buildup and, therefore, brake drag by controlling the normally closed valves within the anti-locking brake system through the anti-locking brake system electronic control module to allow the undesired pressure to be released as the brake fluid passes through the normally closed outlet valves into pressure relieving conduits.
Claims24
A method of eliminating excessive brake fluid pressure buildup that causes undesirable brake drag in a vehicle open hydraulic antilocking brake system of the type having an electronic controller and a brake conduit connected to a normally closed outlet valve that is connected to a pressure relief conduit, comprising the steps of:
- (A) determining a time when the antilocking brake system is deactivated, using the electronic controller;
- (B) determining a condition when brake drag exists, using the electronic controller;
- and
- (C) pulsing the normally closed outlet valve beginning at the time in step (A) when the condition from step (B) exists, using the electronic controller, to thereby allow the excessive brake fluid pressure to exit the brake conduit through the normally closed outlet valve and the pressure relief conduit.
A method of eliminating excessive brake fluid pressure buildup that causes undesirable brake drag in a vehicle open hydraulic antilocking brake system of the type having an electronic controller and a brake conduit connected to a normally closed outlet valve that is connected to a pressure relief conduit, comprising the steps of:
- (A) determining a time when the antilocking brake system is deactivated subsequent to having been activated, using the electronic controller;
- (B) determining a condition when brake drag exists, using a first set of data available from the electronic controller, said first set of data defining the vehicle speed and the speed of each wheel, respectively;
- and
- (C) pulsing the normally closed outlet valve at a preselected frequency for a preselected period, beginning at the time in step (A) when the condition from step (B) exists, using the electronic controller, to thereby allow the excessive brake fluid pressure to exit the brake conduit through the normally closed outlet valve and the pressure relief conduit.
A system for eliminating excessive brake fluid pressure buildup that exceeds a preselected fluid pressure and causes undesirable brake drag in a vehicle hydraulic brake system of the type having a master cylinder connected to wheel brakes through a brake conduit, comprising:
- a valve connected to the brake conduit, said valve remaining closed during normal braking operations;
- a pressure relief conduit connected at one end to said valve and connected at an opposite end to the master cylinder;
- indicator means for indicating when the brake system has been activated and subsequently deactivated;
- and
- pulsing means for cyclically opening and closing said valve at a preselected frequency for a preselected period to thereby allow the excessive brake fluid pressure to exit the brake conduit and return to the master cylinder through said pressure relief conduit to thereby reestablish the pressure within the brake system at the preselected pressure.
Dependencies are inferred from the claim text.