Energy management method for electric quantity maintaining stage of external charge type hybrid vehicle

Abstract

The invention relates to an energy management method for an electric quantity maintaining stage of an external charge type hybrid vehicle, which comprises the following steps: designing integrated control curves of each shift according to an optimal fuel economy curve of an engine of a target vehicle and the speed ratio of a speed changer; and designing a control method of the shifts of the speedchanger, the opening of an electronic air throttle of the engine and the torque of a motor by using the opening of an accelerator pedal, the vehicle speed and the charge state value of a storage battery as control parameters. The method can control the electronic air throttle of the engine, the torque of the motor and the shifts of the speed changer in real time so as to ensure that the engine canrun along an optimal efficiency curve. When the advantages of high transmission efficiency, low cost, and the like of an electric control type automatic transmission are exerted, the control effect of a conventional stepless transmission is realized, and the defects of complicated manufacturing process, high manufacturing cost, low strength of a transmission belt, short service life, and the likeare also avoided.

Description

technical field [0001] The present invention relates to a control method for a hybrid electric vehicle (Hybrid Electric Vehicle, referred to as HEV), in particular to a plug-in hybrid electric vehicle (Plug-in Hybrid Electric Vehicle, referred to as PHEV) that uses a stepped automatic transmission. An energy management method in the Charge Sustaining (abbreviated as CS) stage. Background technique [0002] Energy management strategy is one of the hot and difficult issues in the HEV research and development process. The core issue is to rationally allocate the power between the engine and the electric motor to meet the driver's demand for the driving force of the vehicle while optimizing the working efficiency of each component. [0003] The control strategy of PHEV in the CS stage can learn from the control method of HEV. At present, a lot of research has been done on the control strategies of parallel and hybrid HEVs using stepped automatic transmissions at home and abroad...

AI Technical Summary

Problems solved by technology

[0004] The disadvantages of the above control methods are as follows: logic threshold control method, speed-based control strategy, fuzzy control method, adaptive neuro-fuzzy reasoning system, torque management strategy and coordinated control algorithm, which can calculate the engine and the target torque or power of the motor, the engine and the motor are controlled to make the actual torque consistent with the target value, but these control methods fail to make the engine run along the optimal efficiency curve, and due to the slow dynamic response of the engine , it is necessary to use dynamic coordinated control method to control the engine, and the control algorithm is relatively complicated; the optimal control method such as dynamic programming and the robust control method based on linear matrix inequality can only optimize the vehicle performance according to the established driving cycle. The disadvantage is that it cannot be used for real-time control

Images