Engine starting control method for hybrid all-terrain vehicle

Abstract

The invention discloses an engine starting control method for a hybrid all-terrain vehicle. The problems that an existing range extender is difficult to start at low temperature and unsmooth to startat normal temperature are solved. The engine starting control method is characterized in that an engine torque output rule is formulated according to the starting resistance characteristics of an engine at different temperatures; the starting process comprises a torque increasing process and a torque reduction process; in the torque increasing process, the initial starting torque is equal to the minimum torque, the starting torque is controlled to be equal to the sum of the starting torque at the previous moment and the torque increasing step length, and the starting torque is controlled to beequal to the maximum torque until the starting torque is increased to be larger than or equal to the maximum torque; in the torque reduction process, if the rotating speed of the engine is greater than the starting rotating speed, the torque reduction process is entered, and the starting torque is equal to the difference of the starting torque at the previous moment minus the torque reduction step length; if the output torque is smaller than the minimum torque, the starting torque is controlled to be equal to the idling torque; and if the rotating speed of the engine is smaller than the maintaining rotating speed and a starting switch of the all-terrain vehicle is in an effective on state, the engine is controlled to return to the torque increasing process, and the torque is continuouslyincreased to guarantee that the rotating speed is larger than the maintaining rotating speed.

Description

technical field [0001] The invention relates to the technical field of all-terrain vehicles, in particular to a method for controlling engine startup of a hybrid all-terrain vehicle. Background technique [0002] At present, among all-terrain vehicles, there has never been a hybrid model that uses a range extender. For a hybrid all-terrain vehicle with a range extender, the starting logic is quite different from that of ordinary new energy vehicles on the market. The starting method of the existing range extender is mostly controlled by the engine starting speed-torque meter, but the maximum torque of the engine starting at normal temperature is quite different from that at minus 40°C, and using a set of data will result in insufficient starting ability at low temperature Or the mechanical shock of starting at room temperature is obvious and not smooth. Contents of the invention [0003] The purpose of the present invention is to overcome the deficiencies of the prior art...

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Problems solved by technology

[0003] The purpose of the present invention is to overcome the deficiencies of the prior art, to provide a hybrid all-terrain vehicle engine starting control method, which fills the gap in the hybrid all-terrain vehicle starting strategy, and solves the difficulty of starting the existing range extender at low temperature and normal temperature. Rough starting problem

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