A method for distributing torque between axles of a front-rear dual-motor four-wheel-drive vehicle

Abstract

The invention discloses a torque distribution method between front and rear dual-motor four-wheel drive vehicles, which obtains the current parameters of the vehicle, and automatically selects the distribution mode of the driving torque of the front and rear axle motors of the vehicle according to the driving mode of the driver and the actual driving conditions of the vehicle. The efficiency of the front and rear axle motors or the longitudinal drive performance is used to allocate the inter-axle torque distribution coefficient i. When it is detected that the required torque is greater than zero, the inter-axle torque distribution method is automatically selected according to the driving mode and vehicle mode, including the distribution of the inter-axle drive torque according to the motor drive performance method or: the distribution of the inter-axle drive torque according to the motor efficiency method ; When it is detected that the driver has a deceleration request, choose to distribute the driving torque between the front and rear axles according to the driving performance of the motor. According to the driving mode of the vehicle and the driving conditions of the vehicle, the inter-axle torque can be automatically allocated according to the economy and drive performance, so that the inter-axle torque distribution can meet the driver's economy and drive performance requirements.

Description

technical field [0001] The invention relates to the technical field of electronic control of electric vehicles, and more specifically relates to a torque distribution method between front and rear dual-motor four-wheel drive vehicles. Background technique [0002] Against the backdrop of increasingly severe global energy and environmental issues, the development of electric vehicles is getting faster and faster. Compared with traditional vehicles, electric vehicles, especially front and rear axle four-wheel drive vehicles, have multiple power sources, so torque control is more complicated. In the current mass-produced electric four-wheel drive electric vehicles, the torque distribution of the front and rear motors is basically a fixed ratio or several adjustable fixed ratios during normal driving. Patent (CN105584382A) and patent (CN107097686A) disclose a motor torque distribution control method, which is mainly based on motor efficiency to distribute inter-axle torque. The...

AI Technical Summary

Problems solved by technology

[0003] Aiming at the problem that the torque distribution of the current electric four-wheel drive vehicle only targets a single index (economy, acceleration performance), the present invention proposes a control method capable of automatically distributing inter-axle torque. Automatically distribute the inter-axle torque according to the economical efficiency and driving performance, so that the inter-axle torque distribution can meet both the driver's economical efficiency and the driving performance requirements

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