Control method for reducing engine starting torsion

Abstract

The invention discloses a control method for reducing engine starting torsion. First, a flameout signal is received, and the engine rotating speed and the crank shaft angle are detected, and then whether the engine rotating speed is lower than a rotating speed threshold is judged. If the engine rotating speed is lower than the rotating speed threshold, whether the crank shaft angle is equal to angle threshold value is further judged. If the crank shaft angle is equal to the angle threshold value, an integrated type starting generator is controlled to execute an inversion mode so as to apply resistance force on an engine until the engine rotating speed is lower than or equal to critical value, and the engine is made to stop. Thus, the engine can stop in the non-compressed stroke, and when the engine is started again, torsion needed by starting the engine can be reduced.

Description

technical field [0001] The present invention relates to an engine control method, in particular to a control method for reducing engine starting torque. Background technique [0002] Please refer to Figure 9 Shown is a schematic diagram of a known four-stroke engine 50, which includes a cylinder 51, an intake valve 52, an exhaust valve 53, a piston 54, an igniter 55, a connecting rod 56 and a crankshaft 57 . [0003] The cylinder 51 includes an intake pipe 511, an exhaust pipe 512 and a chamber 513. The chamber 513 communicates with the intake pipe 511 and the exhaust pipe 512. A manifold pressure sensor is arranged in the intake pipe 511. It is used to sense the air pressure of the intake pipe 511 . [0004] The intake valve 52 and the exhaust valve 53 are respectively arranged at the ends of the intake pipe 511 and the exhaust pipe 512 of the cylinder 51. One end of the intake valve 52 and the exhaust valve 53 has a plug portion 520, 530 respectively. The other end of ...

AI Technical Summary

Problems solved by technology

[0018] In order to prevent the engine from stopping in the compression stroke after the engine is turned off, there are related improved technologies, such as the idle stop system published by Takeshi Yanagisawa et al. in 2010. The method is to control a motor to drive the engine when the engine is turned off and completely stopped. Rotate the previous stroke until the engine stops at the non-compression stroke; however, this method still controls the motor to drive the crankshaft to rotate after the engine is completely stopped. The motor must be able to load a large current, and the cost of implementing this method is relatively high

[0019] In addition, another method is to install an electromagnet on the outside of the crankshaft. If the engine speed drops to a threshold value, the electromagnet will be activated to generate suction to the crankshaft, so that the crankshaft will stop in the non-compression stroke. However, when the electromagnet is activated , the electromagnet will absorb metal powder and pollute the engine, resulting in engine damage

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