Engine start control method

Abstract

The invention discloses an engine start control method. The engine start control method involves an ISG motor, an ISG motor position sensor and a controller. The ISG motor can make an engine rotate forwards and backwards. The ISG motor position sensor detects the position of the ISG motor. The controller drives the ISG motor to rotate forwards. When a driving current reaches a specified value, power-off is executed, and then the ISG motor is driven to make the engine rotate backwards to the preset position in the range from the opening position of an inlet valve to the compression top dead center of the engine. When the ISG motor position sensor detects that the ISG motor already rotates over a specified angle value, the controller stops backward rotation driving. According to the engine start control method, the ISG motor is driven to rotate forwards at first and then rotate backwards to stop at the opening position of the inlet valve, and then the engine is rotated forwards to be started or the stop position of the engine is controlled, so that start time is effectively shortened, and the experience of a driver is improved.

Description

technical field [0001] The invention relates to an engine start control method, in particular to an engine start control method for improving the start performance of a motorcycle. Background technique [0002] When the existing motorcycle engine is started, it is firstly reversed to a position close to the compression top dead center, and the reverse and its starting time are relatively long. There are also some motorcycle engines equipped with a pressure reducing valve, which reduces the engine resistance when the engine is reversed. When the above-mentioned engine is reversed without the stroke determination, it may reverse continuously even with a small torque, that is, it cannot It stops at the compression top dead center (the most favorable position for engine starting), so its starting characteristics need to be further improved. Contents of the invention [0003] In order to solve the above-mentioned technical problems, the present invention proposes a control met...

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Problems solved by technology

[0002] When the existing motorcycle engine is started, it first reverses to the position close to the compression top dead center, and the reverse and its starting time are relatively long

There are also some motorcycle engines equipped with a pressure reducing valve, which reduces the engine resistance when the engine is reversed. When the above-mentioned engine is reversed without the stroke determination, it may reverse continuously even with a small torque, that is, it cannot Stop at compression top dead center (the most favorable position for engine starting), therefore, its starting characteristics need to be further improved

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