초록 ▼

The speed of a pump motor in a vehicle brake control system is controlled by comparing an actual pump motor speed to a threshold speed. The actual pump motor speed is determined by measuring the pump back emf while the motor is de-energized. If the actual pump motor speed is greater than the thresho

The speed of a pump motor in a vehicle brake control system is controlled by comparing an actual pump motor speed to a threshold speed. The actual pump motor speed is determined by measuring the pump back emf while the motor is de-energized. If the actual pump motor speed is greater than the threshold speed, the motor remains de-energized. If the actual pump motor speed is less than the threshold speed, the pump motor is energized with a pulse width modulated voltage having a variable duty cycle and a variable frequency which are functions of the difference between the actual pump motor speed and the threshold speed.

대표청구항 ▼

[ What is claimed is:] [1.] A system for controlling at least one vehicle wheel brake comprising:a pump which supplies pressurized brake fluid to the controlled wheel brake;a motor connected to said pump for driving said pump;a control valve connected between said pump and the controlled wheel brake

[ What is claimed is:] [1.] A system for controlling at least one vehicle wheel brake comprising:a pump which supplies pressurized brake fluid to the controlled wheel brake;a motor connected to said pump for driving said pump;a control valve connected between said pump and the controlled wheel brake, said control valve operable to control the flow of pressurized brake fluid from said pump to the controlled wheel brake;a sensor for measuring the speed of said pump motor; anda controller electrically connected to said pump motor speed sensor and said pump motor, said controller operative to provide power to said pump motor and to control said pump motor speed as a function of said sensed pump motor speed by de-energizing said pump motor when said sensed pump motor speed is greater than a motor speed threshold and to maintain said pump motor in a de-energized state while said sensed pump motor speed is greater than said motor speed threshold.