Doppler-effect ground speed sensor for use with a brake system

Details Doppler-effect ground speed sensor for use with a brake system Doppler-effect ground speed sensor for use with a brake system

1992-09-10

1994-08-02

Hellner, Mark

Communications: directive radio wave systems and devices (e.g.,

Return signal controls external device

Radar mounted on and controls land vehicle

342 71, G01S 1300

Patent

active

053349830

ABSTRACT:
Vehicle anti-lock brake control apparatus having wheel speed sensor for detecting actual speed of a vehicle wheel, solenoid-operated valve for regulating the wheel braking pressure, and controller for controlling the valve, on the basis of the detected actual speed, and vehicle ground-speed detected by ground-speed sensor. The controller controls the valve at a controlled duty cycle, which is determined on the basis of at least a wheel speed error and a time derivative of this error. The error is obtained as a deviation of the detected actual wheel speed from a target wheel speed obtained on the basis of the detected vehicle ground-speed.

REFERENCES:
patent: 4346774 (1982-08-01), Hirota et al.
patent: 4432229 (1984-02-01), Nowogrodzki
patent: 4713665 (1987-12-01), Phelan
patent: 4900101 (1990-02-01), Becker et al.
patent: 4932726 (1990-06-01), Iwata et al.
patent: 5204682 (1993-04-01), Beasley

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