PURPOSE: To perform high-reliable monitoring through simple constitution by connecting the work connection part of valves such as pressure control, etc., of an anti-lock control system to a comparator circuit and an OR link to evaluate these outputs depending on a test pulse.
CONSTITUTION: In a monitor circuit used to the pressure control valves (W1-W4) of an anti-lock control system, each one power transistor LT1-LT4 is provided to each final driver for changing each pressure control value. Control signals from a controller are applied to connection parts E1-E4 led to the gates of the transistors LT1-LT4. The work connection parts S1-S4 of the respective control valves are connected to output A1 by the XOR1-XOR3 (exclusive OR) of a comparator circuit 1. The bases of the transistors T1-T4 of an OR link 2 are connected to the connection parts S1-S4, and the output A2 of a transistor T6 to be connected to these emitter sides, together with the output A1, is inputted to an XOR4.
HAINTSU RORETSUKU
MIHIAERU TSUIDEKU
