Speed detecting apparatus for a vehicle

Details Speed detecting apparatus for a vehicle Speed detecting apparatus for a vehicle

1987-12-11

1989-11-28

Lall, Parshotam S.

Boots, shoes, and leggings

36442601, 36442602, 324161, 324166, G01P 1100, G01P 1500

Patent

active

048842273

ABSTRACT:
An apparatus for electrically detecting the speed of a vehicle or the rotating speed of a wheel which is especially suitable for accurate speed detection in an anti-skid control circuit. This apparatus includes a rotor fixed on a rotating portion of the vehicle and provided with protruding timing teeth on the peripheral surface thereof at regular intervals and a sensor provided in the vicinity of the teeth of the rotor and not being in contact with the teeth of the rotor. The sensor detects the movement of the teeth with the rotation of the rotor electro-magnetically or by high frequency and outputs an electrical pulse signal as a speed detecting signal. In order to obtain accurate speed from the pulse signal, the center position of the pulse signal is obtained from both the output timing of the front or rear edge of the pulse and the pulse width, and the rotating speed of the rotor is calculated on the basis of the center position. Thus, accurate speed detection is accomplished without error being introduced from a low-frequency swell and high-frequency noise components of a detected signal.

REFERENCES:
patent: 4072364 (1978-02-01), Gudat et al.
patent: 4073432 (1978-02-01), Schroder
patent: 4202350 (1980-05-01), Walton
patent: 4584528 (1986-04-01), Ohmae et al.
patent: 4667297 (1987-05-01), Kawai
patent: 4670852 (1987-06-01), Masaki et al.
patent: 4718013 (1988-01-01), Kubo
patent: 4720794 (1988-01-01), Skarvada

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