David T Klein

US Patent:

41688660, Sep 25, 1979

Filed:

Sep 9, 1977

Appl. No.:

5/831908

Inventors:

Joseph H. McNinch - Livonia MI
Daniel G. Smedley - Dearborn Heights MI
David T. Klein - Southfield MI

Assignee:

Eaton Corporation - Cleveland OH

International Classification:

B60T 802

US Classification:

303106

Abstract:

A wheel lock control system for use with a vehicle having at least first and second spaced apart, independently rotatable wheels and having a braking system for applying braking forces to such wheels. A brake control responds to an applied lock signal for controlling the braking system to relieve the braking forces on the wheels. Input circuitry including nonlinear frequency to voltage convertors provides first and second wheel speed signals of values nonlinearly representative of the wheel speeds of the first and second wheels, respectively, such that for a given change in wheel speed there is a greater change in wheel speed signal at low wheel speeds than at high wheel speeds. Logic circuitry includes linear comparator circuitry responsive to the nonlinear first and second wheel speed signals for producing the aforementioned lock signal. The frequency to voltage converter operation is monitored, such that fault monitor circuitry disables the lock signal responsive circuitry when the higher of the first and second wheel speed signals rises beyond a preselected limit. The logic circuitry incorporates portions providing a lock signal.