Vehicle starting method based on P2 hybrid transmission system

Abstract

The invention provides a vehicle starting method based on a P2 hybrid transmission system, which relates to the technical field of power transmission. The method comprises the following steps of judging whether a gear shifting rod is in a D-gear position or not when a hybrid clutch C0 is jointed; when the gear shifting rod is in a D-gear position, controlling a pressure value of an equivalent clutch C1 to be kept at a preset pressure value, which is needed when the vehicle prepares to be started; controlling the pressure of the equivalent clutch C1; outputting a torque output by an engine to an output shaft of a transmission through the equivalent clutch; when an equivalent slip frequency Delta nslip is less than a first preset judging threshold value, increasing the pressure value of the equivalent clutch C1 according to a certain slope; and when the equivalent slip frequency Delta nslip is less than a second preset judging threshold value, controlling the pressure value of the equivalent clutch to rapidly rise to a maximum locking pressure value so as to realize stable startup of the vehicle in a pure engine mode. Therefore, the cost of the engine starting 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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