Control or adjustment system for a wheel brake operated by an electric motor
AssigneeITT Manufacturing Enterprises, Inc.
InventorsJurgen Bohm, Karl-Heinz Bill
Life of this patent
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Abstract
A control or adjustment system for a disc brake is operated by an electric motor causing the friction linings of the disc brake in application to the brake disc. To transmit an application force as sensitively as possible to cause deceleration of the vehicle as desired by the driver, on the one hand, and to adjust a precise clearance after a braking operation, on the other hand, two different control modes are applied. The electric motor, therefore, is driven by an electronic servo booster that is actuated either by a deceleration controller or by a position controller, depending on the objective to be achieved.
Claims10
A control system for an automotive vehicle wheel brake operated by an electric motor, said system comprising:
- a first control circuit, said first control circuit comprising a position controller and a first switch,
- a second control circuit, said second control circuit comprising a deceleration controller and a second switch,
- a resolver furnishing position signals about a position angle of a rotor of said motor, said signals being characteristic of a distance between brake linings and brake disc in a brake,
- an angle measurement system allocated to a wheel associated with said brake,
- a desired value conditioner supplied with a nominal signal representing driver's desire to decelerate a vehicle to a certain degree, said desired value conditioner modifying said nominal signal,
- a position signal conditioner supplied with said position signals from said resolver,
- a first comparator to compare an output signal from said conditioner with a nominal angle value, an output signal from said first comparator being input to said position controller to provide a first control mode to calculate a nominal angular velocity for said motor,
- a second comparator to compare said modified nominal signal with an actual signal provided from said brake to indicate to what extent said driver's desire to decelerate is satisfied in said brake, an output signal from said second comparator being input to said decelerator controller providing a second control mode to calculate a nominal angular velocity of said motor, and
- a selection and monitoring module fed by said nominal signal and signals from said angle measurement system, said desire value conditioner, said position signal conditioner, and said actual signal, said selection and monitoring module generating said nominal angle value and furnishing control signals to said first and said second switches controlling same in such a way that only one of said deceleration controller and position controller is in an active mode at a given moment.
Dependencies are inferred from the claim text.