APPARATUS FOR CONTROLLING ENGINE WARMING-UP

摘要

A vehicle has an engine as a driving source. The vehicle has a charge system which generates electric power by using a part of rotational output of an engine, and charges a battery by the generated electric power. Optimal shaft efficiency points are combinations of revolution speed and torque of the engine for maximizing the shaft efficiency. Optimal shaft efficiency line passes through the optimal shaft efficiency points for each engine output level. Warming-up operation line is defined by shifting the optimal shaft output efficiency line to a side to increase heat loss. An engine controller stores the lines. The engine controller performs a warming-up operation by operating the engine at a revolution speed and a torque on the warming-up operation line. The engine controller controls the battery to reduce possibilities of a full charge at a next warming-up.