Parallel connection hybrid electric vehicle and four-parameter control method and device of working modes of vehicle

Abstract

The invention discloses a parallel connection hybrid electric vehicle and a four-parameter control method and device of working modes of the vehicle. The method comprises the steps of obtaining the current state of charge (SOC) of a power battery and required torques of wheels of the parallel connection hybrid electric vehicle; judging whether the current SOC and the required torques of the wheels meet preset mode requirements; if the current SOC and the required torques of the wheels meet the preset mode requirements, a corresponding working mode is determined according to the current SOC, the required torques of the wheels and the preset mode requirements; if the current SOC or the required torques of the wheels do not meet the preset mode requirements, obtaining the prior working mode and the duration thereof and determining the current working mode according to the current SOC or the required torques of the wheels, as well as the prior working mode and the duration thereof. By applying the method, the problem of frequent jumping among different working modes is avoided, the comprehensive performance of the parallel connection hybrid electric vehicle is improved, the fuel economy is improved, and the user experience is enhanced.

Description

technical field [0001] The invention relates to the technical field of hybrid electric vehicles, in particular to a four-parameter control method and device for the working mode of a parallel hybrid electric vehicle and a parallel hybrid electric vehicle. Background technique [0002] In the related art, the control method of the working mode of the parallel hybrid electric vehicle generally only provides the possible working modes and determines the transition conditions between the modes. However, the problems existing in the related technology are: (1) The frequent jumping between modes is not considered, and only the battery state of charge (Stateofcharge, SOC) and demand torque are used as control parameters. The control method may lead to faults that continuously jump between certain states; (2) SOC control is relatively simple, only considering the normal working conditions and not the vehicle starting process. For example, during the vehicle starting process, if the ...

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Problems solved by technology

However, the problems existing in the related technology are: (1) The frequent jumping between modes is not considered, and only the battery state of charge (Stateofcharge, SOC) and demand torque are used as control parameters. The control method may lead to faults that continuously jump between certain states; (2) SOC control is relatively simple, only considering the normal working conditions and not the vehicle starting process. For example, during the vehicle starting process, if the SOC slightly If the SOC is lower than the target value, the pure electric working condition can still be used, and the overall performance of the vehicle is better at this time; if the SOC is far lower than the target value, the pure electric working condition cannot be used to avoid battery failure; (3) The conversion conditions are all fixed values, which cannot be calibrated, which is not conducive to the calibration and debugging of the actual vehicle. The change of the working mode may improve the working efficiency of the engine, but it will also increase the power consumption; although the engine efficiency is greatly improved under certain working conditions , but due to the increased power consumption of the battery and motor, the fuel economy of the vehicle is rather poor, and the efficiency of power consumption should be improved in the process of determining the critical value; (4) the consideration is not comprehensive, although the control methods in related technologies have 10 or more working modes, but due to the large number of modes, whether these modes can be correctly distributed on the plane of SOC and demand torque, and which modes can be converted to each other, and whether the specific conversion conditions are correct, cannot be fully proved ; As a result, the vehicle cannot be in the best state in real time, which affects the fuel economy of the vehicle

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