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Power-split hybrid power system mode switching method

A hybrid power system and hybrid mode technology, which is applied to the arrangement of multiple different prime movers of hybrid vehicles, power units, and general power units, etc. End-to-end synthetic torque fluctuation, transmission component impact, etc., to achieve the effect of taking into account the mode switching time and energy consumption, and improving driving smoothness

Active Publication Date: 2017-11-17
TONGJI UNIV
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  • Claims
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Problems solved by technology

In this process, due to the difference in the dynamic characteristics of the engine and the motor and the characteristics of the clutch / brake itself, the resulting torque at the output end of the gearbox may fluctuate greatly during the switching process, which will cause impact on the transmission components and cause power failure. The transmission is not smooth, which affects the power and ride comfort of the vehicle
The traditional logic threshold control strategy based on rules and experience has great limitations in solving the above problems

Method used

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Embodiment

[0024] The present invention provides an optimal coordination control method based on the switching process of pure electric to hybrid power mode of power split hybrid power system. As a preferred embodiment of the present invention, power split hybrid power system such as figure 1 As shown, the hybrid power system consists of an engine, motors MG1, MG2, brakes B1, B2 and a planetary row structure power coupling device. The hybrid power system based on this type can realize multiple working modes such as pure electric power, hybrid power, driving charging and regenerative braking.

[0025] The vehicle control framework of the power split hybrid electric vehicle involved in the present invention is as follows: figure 2 shown. The pure electric to hybrid mode switching process specifically includes three stages: pure electric mode, engine starting process and hybrid mode. Specifically, when driving in pure electric mode, the whole vehicle is driven solely by the motor MG2 or ...

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Abstract

The invention relates to a power-split hybrid power system mode switching method used for realizing smooth switching from a pure electric mode to a hybrid power mode. The power-split hybrid power system mode switching method comprises the following steps of: 1) in an off-line manner, by adopting an discrete dynamic programming method, respectively obtaining a plurality of engine starting curves corresponding to different set conditions by taking vehicle comfort as an optimization objective in the process of power mode switching; 2) according to actual operating conditions and off-line engine starting curves, performing interpolation solution, and obtaining the optimal engine starting curve corresponding to actual operation, and the torque of a motor MG1, the torque of a motor MG2 and a torque control value of a brake B2 corresponding to the curve at each moment; and 3) compensating the optimal engine starting curve corresponding to actual operation according to the minimum torque ripple at an output end, and finally obtaining a corresponding torque control value in the process of power mode switching. Compared with the prior art, the power-split hybrid power system mode switching method disclosed by the invention has the advantages of improving driving comfort and simultaneously taking account of switching time and energy consumption.

Description

technical field [0001] The invention relates to a power mode switching method, in particular to a power split hybrid power system mode switching method. Background technique [0002] As the mainstream technical solution of deep and plug-in hybrid electric vehicles, power split hybrid power system has been widely used. In order to adapt to different driving conditions and improve its efficiency, the power system needs to change the connection mode between the planetary row elements through the clutch / brake, so that the vehicle can switch to different driving working modes in different transmission ratio ranges. When the system switches between pure electric mode and hybrid mode, it needs to realize the rapid start and stop of the engine. In this process, due to the difference in the dynamic characteristics of the engine and the motor and the characteristics of the clutch / brake itself, the resulting torque at the output end of the gearbox may fluctuate greatly during the swit...

Claims

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Application Information

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IPC IPC(8): B60W10/06B60W10/08B60W20/11B60W30/182
CPCB60W10/06B60W10/08B60W30/182B60W20/11B60K6/445B60K2006/381B60W20/40Y02T10/62
Inventor 赵治国李蒙娜
Owner TONGJI UNIV
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