PURPOSE: To prevent the deterioration of comfortability and variation of car speed under travelling on a coarse road, by reducing the throttle valve (a) open/ close speed when the integrated value of the acceleration of the up/down vibration of car exceeds over predetermined level.
CONSTITUTION: Under travelling of a car, the stepping of an accelerator pedal 1 is detected by an accelerator opening detector 2 to feed a signal through an amplifier 3 to a differential amplifier 4, then the difference against a signal from a throttle valve opening detector 10 is produced to drive a motor 8 thus to control a throttle valve 9. The acceleration of up/down vibration of car is detected by an acceleration level 13 by a subtractor 12 then integrated in an integrator 14, and when the integrated value has exceeded over the referential level 16 the amplification factor of the amplifier 3 is reduced. Consequently the open/close speed of the throttle valve is reduced when travelling on a coarse road resulting in prevension of comfortability and car speed variation.
TAKEUCHI NOBUO
OOTSUKA KAZUTOSHI
YOKOOKU KATSUHIKO
Next Patent: ENGINE THROTTLE VALVE CONTROLLER