Control Module for Single 3/2 Solenoid Controlled Relay Valve
AssigneeBendix Commercial Vehicle Systems LLC
InventorsHermann J. Goebels, Christopher M. Knaack
Life of this patent
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Abstract
In one embodiment, a vehicle braking system, for delivering pressurized air to a brake chamber to achieve a desired braking response, includes an air-pressure controlled relay valve for delivering the pressurized air to the brake chamber. A solenoid receives a variable control input pressure and delivers the control input pressure to the relay valve as a function of a state of the solenoid. An ECU controls the solenoid according to a control model for delivering the pressurized air to the brake chamber and achieving the desired braking response.
Claims7
An electronic control unit, comprising:
- a. a connector electrically communicating with a switching means, which is energized as a function of a control signal transmitted via the connector for controlling a pressurized fluid delivered to a pressure actuator via a relay valve;
- and
- b. a control model determined as a function of a hysteresis of the relay valve, the switching means being energized as a function of the control model.
An electronic control unit, comprising:
- a. at least two inputs for receiving signals indicative of wheel speed;
- b. an ABS controller for receiving the signals indicative of wheel speed for determining wheel slip;
- c. a control model in the ABS controller for generating a pulse width modulated control signal, a duty cycle of the pulse width modulated control signal generated in response to
- i. a target delivery pressure value for an associated solenoid controlled relay valve,
- ii. a hysteresis profile of the associated solenoid controlled relay valve, and
- iii. the wheel slip;
- and
- d. an output for communicating the pulse width modulated control signal.
Dependencies are inferred from the claim text.