Electric switching device

摘要

Disclosed is an electric switching device for monitoring the operation of a hydraulic brake system for automotive vehicles of the type including a brake slip control device. The electric switching device includes a first switch for switching the brake slip control device on and off, a second switch operating a warning lamp, a third switch for controlling a hydraulic pressure pump and a pressure responsive actuating element for actuating the switches dependent on the state of pressure on the brake system. Improved reliability is provided for by including functional redundancy of the first switch into the circuitry including a diode connecting a make type first switch to a break type second switch whereupon the brake slip controller circuit is grounded upon a fault condition in the controller circuit to prevent false signals from reaching the controller.