DEVICE FOR JUDGING COMPLETION OF WARMING UP FOR INTERNAL-COMBUSTION ENGINE

摘要

PURPOSE:To stabilize the operation of an engine and prevent the cleaning efficiency of exhaust gas from being deteriorated by providing a comparator which compares the stored value of sampling with the value of temp. of the completion of warming up, and a device which generates a signal of completion of warming up at a specified time. CONSTITUTION:An A/D converting circuit 1 outputs an engine temp. signal from a TW sensor 16. A latch circuit 18 holds a temp. value from a warming-up completion temp. detecting device 17 and feed it to a comparator 19. The comparator 19 generates a warming-up completion signal when the value of an engine temp. signal fed from the A/D converting circuit 1 becomes above the value of a warming-up completion temp. which is fed from the latch circuit 18. As a result, an engine operating condition judging circuit 20 judges the completion of warming up. Thereby, the instability of the rotation of engine and the deterioration of the cleaning efficiency of exhaust gas can be prevented.