CVT (continuously variable transmission) hybrid electric vehicle power source torque optimizing distribution method

Abstract

The invention discloses a CVT (continuously variable transmission) hybrid electric vehicle power source torque optimizing distribution method which comprises the steps of (1) building a whole vehicle transmission system dynamics equation which is related to an accelerator pedal opening value by taking the accelerator pedal opening value, accelerator pedal speed and power supply SOC (state of charge) as optimizing state variables and taking a required torque value as basic; (2) taking engine power as required input power of a whole vehicle, and setting power consumed for overcoming traveling resistance of the vehicle and storage battery power as output power of a system, and combining the whole vehicle transmission system dynamics equation in step (1) so as to obtain final required output power of the system; and (3) defining system efficiency according to the ratio of the required output power and the required input power, taking the highest system efficiency as an optimizing target, and optimizing to obtain power source target torque. The method of the invention can improve the whole vehicle working efficiency, solves a torque distribution problem at a driving working state, and can be widely applied to the field of hybrid electric vehicles.

Description

technical field [0001] The invention relates to the field of hybrid electric vehicles, in particular to a method for optimally distributing power source torque under driving conditions of a CVT (continuously variable automatic transmission) hybrid electric vehicle. Background technique [0002] Under the driving conditions of hybrid electric vehicles, formulating a reasonable energy management strategy can improve the working characteristics of the whole vehicle, and then improve its fuel economy. For hybrid vehicles equipped with CVT (continuously variable automatic transmission), the CVT speed ratio can be continuously changed within a certain range, so the power source torque distribution and the vehicle's working characteristics can be better realized through comprehensive control of the engine, motor and CVT optimization. [0003] Aiming at the problem of optimal energy distribution of CVT hybrid electric vehicles, most of the current studies focus on the engine workin...

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Problems solved by technology

[0003] Aiming at the optimal distribution of energy in CVT hybrid electric vehicles, most of the current research focuses on the engine working in the high-efficiency zone as the control target, ignoring the influence of the efficiency of the motor, battery and transmission system on the energy utilization rate of the hybrid system.

There are also a few researchers who have carried out relevant research with the goal of the highest system efficiency, but the state variables are vehicle speed and acceleration, and acceleration is difficult to intuitively reflect the driver's intention and feeling

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