Vehicle control method and system

Abstract

The invention discloses a vehicle control method and system. The method includes the following steps that the required torque, the rotation speed and the SOC of a power battery are received; according to the rotation speed, an engine efficient drive torque corresponding to an engine efficient region critical curve and a motor travel power generation torque corresponding to a travel power generation curve are obtained; the required torque, the engine efficient drive torque and the motor travel power generation torque are compared; if the required torque is larger than or equal to the engine efficient drive torque, a vehicle is controlled to enter in an engine drive mode; and if the SOC is smaller than a preset value and the required torque is smaller than the engine efficient drive torque and larger than the motor travel power generation torque, the vehicle is controlled to enter in a travel power generation mode. By the adoption of the method, the engine efficient drive torque corresponding to the engine efficient region critical curve and the motor travel power generation torque corresponding to the travel power generation curve are obtained according to the rotation speed, so that the vehicle is controlled to enter in the corresponding working mode, the oil saving effect and power consumption are comprehensively considered, and the vehicle works under the optimal working condition.

Description

technical field [0001] The present invention relates to the field of vehicle technology, in particular to a control method and system for a vehicle. Background technique [0002] When the SOC (State of charge, battery state of charge) of the battery is lower than the target value, PSHEV (Parallel Split Hybrid Electric Vehicle, parallel hybrid electric vehicle) works in the power supplement mode, and the vehicle may be in series drive, running power generation Or the pure engine working condition, at this time, how to comprehensively consider the fuel saving effect and power consumption of the engine, how to choose the three working conditions, and how to control the engine and the corresponding motor under each working condition are the difficulties of PSHEV, which will affect the power and economy of the vehicle. has an important influence, [0003] In the related art, when the SOC is low, the series and driving power generation control are adopted; when the speed is high,...

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Problems solved by technology

[0004] However, in the process of mode determination and torque distribution in the related art, the influence of engine fuel saving effect and power consumption is not considered comprehensively, especially in the process of power generation during driving, although the engine can be made to work on the best fuel economy curve, but Both the battery and the motor have power consumption. For example, at some point, although the engine works at the best economical operating point, the economical efficiency of the vehicle is poor due to excessive power consumption. That is to say, the vehicle in the related art The control method lacks a clear division method between pure engine drive and driving power generation drive, and there is blindness

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