Finished automobile starting method based on P2 hybrid power transmission system

Abstract

The invention relates to the technical field of power transmission and provides a finished automobile starting method based on a P2 hybrid power transmission system. The method includes the steps that the pressure of a hybrid clutch C0 is controlled to be increased to a control pressure value required for eliminating a gap between friction plates; the torque of a motor is output to an engine through the pressure of the hybrid clutch C0; the pressure of the hybrid clutch C0 is controlled to be adjusted to the small pressure, and the engine is controlled to be automatically ignited and started; the rotation speed of the engine is gradually reduced by increasing of the pressure of the hybrid clutch; when the rotation speed change rate of the engine is smaller than a preset change rate threshold value, the slip frequency of the hybrid clutch C0 is controlled to be gradually reduced; the pressure of the hybrid clutch is increased according to a preset slope; and the pressure of the hybrid clutch is controlled to be increased to the maximum locking pressure, the engine and the motor are controlled to jointly drive a finished automobile to be started, so that the finished automobile is smoothly started in a pure engine mode, and the cost for the engine to start the motor is saved.

Description

technical field [0001] The invention belongs to the technical field of power transmission, and in particular relates to a method for starting a whole vehicle based on a P2 hybrid power transmission system. Background technique [0002] Hybrid vehicles have high fuel economy performance and excellent driving performance, and when starting and accelerating, due to the assistance of the drive motor, fuel consumption can be reduced. Simply put, compared with cars of the same size, the fuel cost is lower . Moreover, the drive motor of the auxiliary engine can generate powerful power at the moment of starting, so the car owner can enjoy stronger starting and acceleration. At the same time, a high level of fuel economy can be achieved. [0003] Hardware such as motors and batteries are added to hybrid vehicles, so the cost of hybrid vehicles is relatively high, resulting in certain difficulties in the mass promotion of hybrid vehicles. Contents of the invention [0004] The pu...

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Problems solved by technology

[0004] The purpose of the present invention is to provide a method for starting a whole vehicle based on a P2 hybrid power transmission system, aiming to solve the problem of high cost of hybrid vehicles in the prior art in order to achieve the purpose of fuel-saving and strong starting acceleration.

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