Engine starter

Abstract

An engine starter capable of finally cranking a crankshaft in forward direction after driving in reverse direction at least under specified conditions so that a suitable pendulum start operation can be surely performed, wherein, a motor controls a rotating speed for reversely rotating the crankshaft so that the crankshaft does not come out of the top dead point from an expansion stroke side at the time of reverse rotation, whereby a large compressive repulsion can be provided by controlling the rotating speed so that the crankshaft stops near the top dead center without coming out of the top dead center, a large assist force or an entrance length can be provided when the crankshaft is reversed and driven in forward direction, assured start is enabled, and the size of the motor can be reduced and the power consumption thereof can be improved.

Description

Technical field [0001] The present invention relates to an engine starting device. Background technique [0002] In the past, electric motors were used to rotate the power output shaft in automobiles, and some used their electric motors as generators. In this way, a single electric motor can serve as both a starter and a generator, thereby simplifying the auxiliary machinery of the engine. [0003] In the starting device, since the position of the piston is not certain when the engine is started, it may start from a stopped state at a position before the compression stroke, or it may start reliably in a cold state such as a large viscous resistance, so it must be considered Increasing the output power of the motor leads to the problem of enlarging the motor. [0004] In order to enable starting under the above conditions even when the engine output is very small, a swing-type starting device may be used that first rotates the engine in the reverse direction during starting...

AI Technical Summary

Problems solved by technology

In order to detect the position of the rotational power output shaft at the time of restarting like this, it is conceivable to install an encoder that can detect the absolute angle, but there is a problem that the cost of the device is high.

[0008] However, due to the large rotation angle (360 degrees) used to detect the cycle, when the rotation speed of the crankshaft changes greatly during one revolution, such as during rapid acceleration and deceleration or inaccurate ignition, sometimes The relationship between the size of the cycle is opposite, and sometimes it may not be possible to distinguish the exhaust stroke from the compression stroke

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