Controller for electromechanical braking system with running clearance adjustment and method
AssigneeGoodrich Corporation
InventorMihai Ralea
Life of this patent
Estimating the term…
Abstract
A system and method for establishing a running clearance position for an electromechanical actuator (28), wherein the running clearance is based on an actuator ram (34) position attained during a force application to a brake stack (30). In particular, a running clearance calibrator (66) determines a position value corresponding to a position of the force applicator when retraction from an application of force on the brake stack commences. The running clearance calibrator also generates a running clearance position as a function of the position value.
Claims21
A controller for an electromechanical actuator operative to apply a braking force to brake a wheel of a vehicle, the electromechanical brake actuator having a motor driven to control the displacement of a force applicator relative to a brake stack, the controller comprising a running clearance calibrator that determines a position value corresponding to a position of the force applicator and force feedback data corresponding to the force applicator during a braking cycle in response to retraction from an application of force on the brake stack and that generates a running clearance position as a function of the position value,
- wherein the running clearance calibrator includes a brake deflection look-up table for outputting a brake deflection value based on a force value corresponding to force applied by the force applicator to compress the brake stack.
An electromechanical braking system, comprising:
- an electromechanical actuator operative to apply a braking force to brake a wheel of a vehicle and having a motor driven to control displacement of a force applicator relative to a brake stack;
- a controller including a running clearance calibrator that determines a position value corresponding to a position of the force applicator and force feedback data corresponding to the force applicator during a braking cycle in response to retraction from an application of force on the brake stack and that generates a running clearance position as a function of the position value;
- a position sensor that provides force applicator position feedback data to the controller;
- a force sensor that provides the force feedback data to the controller and
- wherein the running clearance calibrator includes a brake deflection look-up table for outputting a brake deflection value based on a force value corresponding to force applied by the force applicator to compress the brake stack.
A method of adjusting a running clearance of an electromechanical actuator that is operative to apply a braking force to brake of a wheel of a vehicle, the electromechanical brake actuator having a motor driven to control the displacement of a force applicator relative to a brake stack, comprising:
- determining a position value corresponding to a position of the force applicator and force feedback data corresponding to the force applicator during a braking cycle in response to retraction from an application of force on the brake stack;
- and
- generating a running clearance position as a function of the position value, wherein the generating combines the position value, a reference running clearance value and a brake deflection value that corresponds to force applied by the force applicator to achieve compression of the brake stack;
- sampling force applied by the force applicator on the brake stack upon the detection of the retraction;
- and
- translating the sampled force to the brake deflection value.
Dependencies are inferred from the claim text.