DC level detector and zero velocity gate circuit for use in a ve

Details DC level detector and zero velocity gate circuit for use in a ve DC level detector and zero velocity gate circuit for use in a ve

1972-07-03

1977-02-01

Kunin, Stephen G.

Fluid-pressure and analogous brake systems

Pipeless valves

303 20, 303106, B60T 808

Patent

active

040059090

ABSTRACT:
Provided is a DC level detector and zero velocity gate circuit utilized in a vehicle skid control braking system. The circuit includes a first signal generator for generating a plurality of DC signals when the DC voltage level of a varying DC signal coupled to the circuit reaches a selected value, i.e., a DC voltage level representative of a substantially zero frequency condition. The varying DC signal is preferably proportional to the wheel speed of a moving vehicle. The circuit also includes a second signal generator for generating a gate signal indicating when the DC level reaches a selected level which indicates a zero velocity wheel speed. The first signal generator generates first and second signals which are differentiated by third and fourth signal generators indicating vehicle deceleration and vehicle acceleration in the vehicle skid control braking system. The circuit advantageously eliminates any undesirable ripple characteristics of the varying DC signal, preventing such ripple characteristics from being coupled to other voltage responsive circuits in, for example, a vehicle skid control braking system.

REFERENCES:
patent: 3499689 (1970-03-01), Carp et al.
patent: 3578819 (1971-05-01), Atkins
patent: 3606490 (1971-09-01), Ando
patent: 3608979 (1971-09-01), Coyle
patent: 3620577 (1971-11-01), Neisch et al.
patent: 3690735 (1972-09-01), Arai et al.

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