Engine control method and device

Abstract

The invention provides an engine control method and device. The method comprises the following steps: when a whole vehicle is in a braking energy recovery condition, determining the power decrease change rate, corresponding to the vehicle speed and aperture of a braking pedal, of a fuel cell engine according to the preset relation between the vehicle speed and the power decrease change rate and the preset relation between the aperture of the braking pedal of the power decrease change rate; determining a demand power initial value under the braking energy recovery condition according to the SOCof a power battery and the vehicle speed; calculating a demand power target value under the braking energy recovery condition according to a charging power limit value, a braking recycle maximum power value and the demand power initial value under the braking energy recovery condition; and controlling the engine to output power according to the power decrease change rate until the output power reaches the demand power target value under the braking energy recovery condition. According to the method, the economy of the whole vehicle can be maximally increased, and the service life of a fuel cell can be prolonged.

Description

technical field [0001] The present invention relates to the technical field of automation control, and more specifically, to a method and device for controlling an engine. Background technique [0002] Existing range-extended electric vehicles are all equipped with large motors in order to ensure economy, so as to ensure maximum power improvement when the fuel cell engine is working. The resulting problem is that when the braking energy is recovered, if the fuel cell is working, the battery may not be able to fully receive the electric energy from the fuel cell engine and the electric energy recovered from the braking energy, so how to improve the braking performance as much as possible? Energy recovery has become an important research direction for extended-range electric vehicles. Contents of the invention [0003] In view of this, the present invention provides an engine control method and device, which can not only improve the economical efficiency of the whole vehicl...

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Problems solved by technology

The resulting problem is that when the braking energy is recovered, if the fuel cell is working, the battery may not be able to fully receive the electric energy from the fuel cell engine and the electric energy recovered from the braking energy, so how to improve the braking performance as much as possible? Energy recovery has become an important research direction for range-extended electric vehicles

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