Starting control method and system for isg type hybrid electric vehicle

Abstract

The invention discloses a starting control method and system of an ISG type hybrid hybrid vehicle. The starting control method of the integrated starter and generator in the method is as follows: starting the integrated starter and generator and making the torque of the integrated starter and generator within the starting time The first part of the starting period increases linearly with a large rate of change, and the latter part of the starting period increases linearly with a small rate of change; the engine starting control method includes: from the initial moment of starting, control the fuel injector of the engine to be in the state of stopping fuel injection, and control the clutch to be in the state of Combine the state, and start recording the starting time of the engine; obtain the engine speed in real time; judge whether the current speed of the engine is greater than or equal to the engine idle speed; if so, judge whether the starting time of the engine is less than or equal to the time interval corresponding to the starting time period; if If yes, the clutch is controlled to be disconnected; after a delay time, it is judged whether the current rotational speed of the engine is greater than or equal to the starting rotational speed of the engine; if so, the injector is controlled to inject oil.

Description

technical field [0001] The invention relates to the technical field of starting a hybrid electric vehicle, in particular to a starting control method and system for an ISG type hybrid hybrid vehicle. Background technique [0002] Hybrid hybrid vehicles have been widely used in the field of new energy vehicles due to their simple operation, comfortable driving and outstanding economic performance. ISG hybrid hybrid vehicles introduce a starter Integrated Starter and Generator (ISG, Integrated Starter and Generator), the output shaft of the integrated starter and generator is connected to the output shaft of the engine through a normally engaged clutch, and the integrated starter and generator is used as an auxiliary power source to replace the starter and the dynamo. [0003] figure 1 Shown is a schematic diagram of the structure of the auxiliary power unit (APU, AuxiliaryPowerUnit) of the ISG type hybrid electric vehicle, and the auxiliary power unit includes an engine 3, ...

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Problems solved by technology

[0005] The technical problem to be solved by the present invention is that in the prior art, the ISG type hybrid hybrid vehicle produces a large impact and wear on the clutch during the starting process, resulting in a clutch service life lower than the expected design requirements

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