Abnormality discriminating method of electronic controller

Abstract

Abstract PURPOSE:To discriminate an abnormality of an electronic controller with high reliability, by detecting an abnormality of an input/output device via a timer and at the same time discontinuing the working of the timer in a mode which discriminates no abnormality. CONSTITUTION:An electronic controller 5 receives various types of state signals of a device to be controlled, e.g., an automobile engine from various sensors 8, 10, 11, 15 and 24 which function as input devices as well as switches 16 and 17. Based on these state signals various control valves 6, 21 and 22 which serve as output devices are controlled, and therefore the working of the engine is performed. A CPU501 monitors an obnormality of the control output or input signals given from various sensors when the dicriminating operation is not normal and then compensates an abnormality when an internal timer detects that the abnormality continues for a fixed period. The CPU501 stops the working of the timer in a mode which does not discrminate an abnormality when the engine starts or immediately before the engine stops. This avoids the misdiscrimination of an abnormality.

Inventors

• 👤 Akihiro Yamato
• 👤 大和　明博
• 👤 Yutaka Otobe
• 👤 乙部　豊

Bibliographic Details