Digital control circuit for producing acceleration and deceleration control signals in an antiskid control system

US4113322A · kind A · utility

Assignee

• Wabco Westinghouse · IT

Inventors

• Gerhard Ruhnau · Hannover, DE
• Wolfgang Gudat
• Peter Liermann · Barsinghausen, DE
• Karl Hesse · Sarstedt, DE

Key dates

• Filing date: Jun 24, 1977
• Grant date: Sep 12, 1978
• Expiry date: Jun 24, 1997

Classification

• Technology area (CPC G): Physics
• CPC primary: G01P1/106
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

An antiskid control system for a vehicle in which acceleration and deceleration control signals are generated by a control circuit in accordance with the rotational speed of a wheel monitored by a sensor device that produces a pulse train whose frequency varies with wheel speed. A digital counter operates for the duration of each pulse cycle of the sensor signal whereby the pulse count obtained represents a cycle duration of the sensor signal. Within the control circuit to which the sensor signal is supplied, a control unit transfers the pulse count after each cycle to a first shift register as a measure of the cycle duration. The first shift register outputs the pulse count of the measured cycle duration to a comparator to which there is also connected a pulse count of a reference cycle duration supplied by a second shift register to which the pulse count of a previous measured cycle duration has been supplied by the first shift register to form the reference cycle duration. The reference cycle duration and measured cycle durations are compared to obtain a difference signal which is subsequently compared to an admissible difference signal to provide the acceleration and decelerati…