Internal combustion engine controller for setting idle speed and vehicle mounting the same

摘要

An ECU for controlling an engine counts an unused time TIM of engine in a low-temperature environment. If the unused time TIM is shorter than a predetermined reference value, the ECU sets idle speed immediately after start of operation of the engine to a first idle speed, and if the unused time TIM is longer than the reference value, sets the idle speed to a second idle speed higher than the first idle speed. If duration of the second idle speed exceeds a reference period determined by state of driving of the vehicle, the ECU sets the idle speed to be lower than the second idle speed. In this manner, increased vibration in idling operation in a low-temperature environment can be prevented.

主权项

1. A controller for an internal combustion engine, said controller counting unused time of said internal combustion engine, setting idle speed of said internal combustion engine after engine start to a first idle speed if said unused time is short, setting the idle speed of said internal combustion engine after engine start to a second idle speed if said unused time is long, and setting said idle speed smaller than said second idle speed if duration of said second idle speed exceeds a reference period,
said controller changing length of said reference period in accordance with state of driving of said internal combustion engine, when said idle speed is set to said second idle speed.