Delphi Technologies, Inc.

Richard James Thomas

Bryan Peter Riddiford

Schuyler Scott Shaw

John Benjamin Hageman

Michael C Pfeil

Ernst Severin Baumgartner

Andrew Colarik

A method for balancing brake force is disclosed. The method includes determining whether a deceleration value reaches a first deceleration threshold in response to a braking event and determining brake condition and vehicle motion. Based on brake condition and vehicle motion determination and the first deceleration threshold determination, the method determines whether the deceleration value reaches a second deceleration threshold, and applies threshold balancing when the second deceleration threshold is reached.

Extended braking compensation in hybrid braking systems

The problem of maintaining fluid modulus during a fast mode release of fluid pressure in a force generating apparatus having a force generating actuator fluidically coupled to a force generating device is solved by limiting the rate at which the actuator can reduce fluid pressure in an apply chamber of the actuator to a rate low enough to preclude a change in modulus of the fluid during the fast mode release.

Fast mode release in a force generating apparatus

The present invention provides a method and control scheme to operate a motor-driven actuator. This includes determining actuator force on an external device, determining a command force, and monitoring actuator position. A determination is made whether to operate in a force-control mode or a position-control mode. Both the force-control mode and the position-control mode employ a common feedback control method (e.g. PI or PID). The system operates the actuator in the force-control mode, using actuator force as feedback to the control scheme when the controller determines that the force sensor is operating in its linear range. When the force sensor is operating outside or near the limits of its linear range, the control scheme determines a pseudo-force, comprising estimated force based upon measured position. The pseudo-force is input to the common feedback control method to control the actuator.

Method and apparatus for control of a motor-driven brake actuator

A force generating apparatus for providing a force to a moving element based upon receipt of an electrical force signal includes a force applying element coupled to the moving element for applying the force to the moving element and an actuator coupled to the force applying element for actuation thereof in response to receiving the electrical force signal. The force generating apparatus further includes a controller for determining when the force apply element is in an apply mode, determining the elapsed time until reversion to a normal mode, determining when the elapsed time is greater than a predefined minimum, modifying the value of the electrical force signal sent to the actuator, and modifying a stored control parameter.

Control command modification to minimize saturation effects for controlled force application

The problem of maintaining fluid modulus during a fast mode release of fluid pressure in a force generating apparatus having a force generating actuator fluidically coupled to a force generating device by a fluid circuit having restrictions and resistance to fluid flow is solved by sensing a pressure remotely from an actuator apply chamber, determining an estimated chamber pressure form the sensed pressure, and limiting the rate at which the actuator can reduce fluid pressure in an apply chamber of the actuator to a rate low enough to preclude a change in modulus of the fluid during the fast mode release.

Fast mode release in a force generating apparatus using estimated actuator apply chamber pressure

A brake system and method of controlling the system are disclosed. The system provides secondary hydraulic braking in a de-energized mode. The system includes a wheel brake associated with wheels of a vehicle typically at each corner of the vehicle. The wheel brake typically includes a caliper or drum for deceleration of the vehicle. The system includes a master cylinder in fluid communication with the wheel brake. In the de-energized mode, the master cylinder operates the wheel brake. A solenoid isolation valve decouples the master cylinder from the wheel brake when the system is in a normal, i.e., an energized, mode. As such, the master cylinder is isolated from the wheel brake and is prevented from operating the wheel brake. Alternatively, in the de-energized mode, the isolation valve couples the master cylinder with the wheel brake to provide the secondary hydraulic braking. The system includes an actuator assembly for operation of the wheel brake independent of the master cylinder when the system is in the energized operational mode. A second, normally-closed, solenoid valve opens in the energized mode to couple the actuator assembly with the wheel brake. The second solenoid valve closes in the de-energized mode to isolate the actuator assembly from the wheel brake such that the secondary hydraulic braking is provided through the master cylinder.

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Kettering, OH, United States of America

Richard James Thomas