Patent ID: 7473206

Claim:
An engine speed controller provided to a vehicle energy control system that includes an engine controller, a generator controller, and an auxiliary device controller, the engine controller controlling an engine, which drives a generator, an auxiliary device, and a vehicle, the generator generating electricity and supplying the electricity to a battery and a plurality of current consumers, the generator controller controlling the generator, the auxiliary device controller controlling the auxiliary device, the engine speed controller performing a feedback control such that engine speed substantially coincides at a target value, the engine speed controller comprising: an electric power generation calculation unit that calculates one of a requested power generation and a present power generation of the generator; and an engine speed changing unit that evaluates tendency of power generation on the basis of the one of the requested power generation and the present power generation, wherein the engine speed changing unit requests increase in the engine speed when the engine speed changing unit determines the power generation to be inclined toward shortage, and the engine speed changing unit requests decrease in the engine speed when the engine speed changing unit determines the power generation to be inclined toward excess.