Vehicle engine idle speed control

摘要

A vehicle speed sensor (42) detects a rotational speed of a rear wheel (3). A throttle valve (18) is positioned at a downstream location (15a) of an intake pipe. An idle speed control device (9) controls the amount of air flowing through the intake pipe to perform an idle speed control. An ECU (7) detects abnormality (S1,S2) of the idle speed control device (9) based on an intake pipe pressure. The ECU (7) inhibits a rotational speed of the engine (10) from increasing (S5) when an abnormality of the idle speed control device (9) is determined.