Hybrid electric vehicle front and rear torque control method and device

A hybrid vehicle and torque control technology, applied in the automotive field, can solve problems such as not much research, and achieve the effect of reducing emissions and improving vehicle economic performance

Inactive Publication Date: 2018-11-02
SCHAEFFLER TECH AG & CO KG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the current hybrid four-wheel drive vehicles, there is not much research on how to effectively distribute the output torque of the engine and the drive motor under different operating modes.

Method used

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  • Hybrid electric vehicle front and rear torque control method and device
  • Hybrid electric vehicle front and rear torque control method and device
  • Hybrid electric vehicle front and rear torque control method and device

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Embodiment Construction

[0047] In order to make the above objects, features and advantages of the present invention more comprehensible, specific embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0048] refer to figure 1 , a transmission system of a hybrid electric vehicle, including: an engine E used as a power source, a battery B and a drive motor M1, M2, wheels F1, F2, R1, R2 used as an output end, and a power source used to It is transmitted to the transmission mechanisms T1, T2 of the wheels F1, F2, R1, R2.

[0049] Specifically, the drive motors M1, M2 include the front drive motor M1 and the rear drive motor M2, the transmission mechanisms T1, T2 include the front transmission mechanism T1 and the rear transmission mechanism T2, and the wheels F1, F2, R1, R2 include the left front wheel F1, right Front wheel F2, left rear wheel R1 and right rear wheel R2. The engine E and the front drive motor M1 output power to the front ...

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Abstract

Provided are a hybrid electric vehicle front and rear torque control method and device. The torque control method comprises the steps that according to current vehicle state information and driver input information, the total theoretical torque of a power source in a vehicle to a front speed change mechanism is obtained; a running mode of the current vehicle is detected; when it is detected that the running mode is an AWD running mode, the slippage rate between front wheels and rear wheels of the vehicle is obtained; according to the total theoretical torque and the slippage rate, a rear actual torque of the power source to a rear speed change mechanism is obtained; according to the total theoretical torque and the rear actual torque, a front actual torque of the power source to the frontspeed change mechanism is obtained. According to a torque distribution method, the torques of the front wheels and the rear wheels are adjusted according to the slippage rate, accordingly the slippagerate between front wheels and rear wheels is reduced when the slippage rate is higher, and the running stability is improved. In addition, the torque required by the vehicle can be also more uniformly distributed to the front wheels and the rear wheels, and accordingly the controllability and stability of the vehicle are improved.

Description

technical field [0001] The invention relates to the technical field of automobiles, in particular to a method and a control device for controlling the torque of the front and rear wheels of a hybrid electric vehicle. Background technique [0002] A hybrid four-wheel-drive vehicle generally has two operating modes, including: a normal operating mode and an AWD operating mode. Under normal circumstances, when the normal running mode is adopted, the engine, drive motor and other power sources in the vehicle give priority to providing torque to the front wheels, and the vehicle is mainly driven by the front wheels. Vehicles in this mode have better fuel efficiency. However, when the friction coefficient of the road surface is small and the friction limit of the tires is reduced, it is difficult to control the driving state of the vehicle in the normal operation mode. [0003] Therefore, under certain conditions, it is necessary to adopt the AWD operation mode, and the power sou...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B60W20/15B60W10/06B60W10/08B60W10/11B60W40/10
CPCB60W10/06B60W10/08B60W10/11B60W20/15B60W40/10B60W2510/1005B60W2520/10B60W2520/263B60W2520/28B60W2710/0666B60W2710/083B60W2710/1022Y02T10/62
Inventor 李智明
Owner SCHAEFFLER TECH AG & CO KG
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