Crankshaft position synchronization control method and system of integrated starter generator

Abstract

The invention provides a crankshaft position synchronization control method and system of an integrated starter generator. The method comprises: when an engine is started and an engine control unit determines that an absolute crankshaft angle is equal to a predetermined angle, the engine control unit outputs a crankshaft synchronization trigger signal to an integrated starter generator controller;and when the integrated starter generator controller receives the crankshaft synchronization trigger signal, the integrated starter generator controller causes the crankshaft angle recognized by itself to be equal to the predetermined angle.

Description

technical field [0001] The invention relates to a synchronization control method and system, in particular to a crankshaft position synchronization control method and system of an integrated starter generator. Background technique [0002] refer to figure 1 , China Taiwan No. I476320 Announcement Patent Case discloses a control method for reducing engine starting torque, which uses an integrated starter generator (Integrated Starter and Generator, ISG) 14 to make the engine Stopping on the non-compression stroke, so that the next time the engine is restarted, the torque required to start the engine can be reduced. The integrated starter generator 14 is electrically connected to a battery 15 and the integrated starter generator controller 13 . [0003] Since the operation of the four-stroke engine includes four strokes of intake, compression, explosion, and exhaust, the range of the crank angle of the crankshaft (not shown) is 720°. In order to determine which stroke the e...

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Problems solved by technology

[0004] However, the above-mentioned Chinese Taiwan No. I476320 announcement patent case has the following disadvantages in practical application: (1) the integrated starter generator controller 13 needs to be added to read the intake air pressure sensor 11 and the crankshaft position sensor 12 signals. circuit, resulting in increased cost; (2) the intake pressure sensor 11 and the crankshaft position sensor 12 are originally connected to the engine control unit (ECU) for the determination of the stroke and the control of the ignition and fuel injection timing, so If the signal is then tapped to the integrated starter generator controller 13, there will be a problem of signal distortion; and (3) the integrated starter generator controller 13 itself must receive the interruption of the rotor position sensor (not shown in the figure) signal, so if it is necessary to receive interrupt signals from the intake pressure sensor 11 and the crankshaft position sensor 12, the calculation load of the integrated starter generator controller 13 will be increased, which will easily lead to the output of the integrated starter generator control signal deviation

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