Idle speed control method of a hybrid electric vehicle

Abstract

The invention discloses an idle speed control method of a hybrid electric vehicle. The idle speed control method comprises the following steps: respectively calculating an idle target speed required by current energy management and a minimum speed of current power system; obtaining a transmission request speed and an engine request speed respectively; taking the maximum of idle speed, transmissionrequest speed and engine request speed, and taking the minimum of the maximum and the minimum of the powertrain speed as the motor target speed; controlling the motor torque by the motor PID controller so that the motor speed reaches the motor target speed and the power system enters the stable idle speed. the method is applied, the idle speed control of the engine with different rotational speeds is realized by the rotational speed control of the electric motor, The motor has fast torque response and stable idle speed, and adopts PID control mode, which limits the upper and lower limits of torque and the speed of change in the speed control process of the motor, ensures the smoothness of the vehicle when entering or exiting the idle speed working condition, and improves the fuel consumption level and NVH level in the idle speed process.

Description

technical field [0001] The invention relates to the field of new energy power systems, and more specifically, relates to an idle speed control method of a hybrid electric vehicle. Background technique [0002] More and more stringent fuel consumption regulations have greatly promoted the development of automobile energy-saving technology. Compared with traditional internal combustion engine vehicles with low thermal efficiency, serious exhaust pollution, short driving range and high cost of pure electric vehicles, hybrid vehicles have both low Features such as emission and high driving range have gradually become the benchmark for automobile development. Among them, the electromechanical coupling transmission system of the P2 configuration is widely used in the hybrid power transmission system. [0003] In the hybrid powertrain of P2 configuration, such as figure 1 , figure 1 It is a schematic structural diagram of a hybrid power transmission system in the prior art. The ...

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Problems solved by technology

[0004] In view of this, the object of the present invention is to provide an idle speed control method of a hybrid electric vehicle to solve the problems of overshooting, unstable idle speed and slow idle speed adjustment in the idle speed control of traditional fuel vehicles.

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