Multi-mode hybrid electric four-wheel drive system and control method thereof

Abstract

The invention discloses a multi-mode hybrid electric four-wheel drive system, comprising a front axle drive assembly, a rear axle drive assembly, a front axle motor controller, a rear axle motor controller and a power battery, the front axle motor controller, the The rear axle motor controller is connected in parallel with the power battery, the front axle drive assembly includes a front axle motor and an engine, the engine is connected to the front axle motor, the front axle motor is connected to the front axle motor controller Electrical connection; the rear axle drive assembly includes a rear axle motor, and the rear axle motor is electrically connected to the rear axle motor controller. The invention also discloses a control method of the multi-mode hybrid electric four-wheel drive system. The invention arranges one of the two drive motors in the rear axle drive assembly, which effectively reduces the difficulty and cost of the front compartment layout, and is applicable to small and medium-sized vehicles.

Description

technical field [0001] The invention relates to the field of automobiles, in particular to a multi-mode hybrid electric four-wheel drive system and a control method thereof. Background technique [0002] 1) After decades of development of hybrid drive technology, many mature technical solutions (series, parallel, single-mode hybrid and multi-mode hybrid, etc.) have emerged. In particular, the multi-mode hybrid system (connecting the engine and two motors with a power coupling device), with its good adaptability to working conditions and strong ability to optimize operating points, has become the main hybrid technology solution promoted by major automobile companies. However, the traditional four-wheel drive system needs to increase the transfer case, limited-slip differential, multi-disc clutch, etc., resulting in a significant increase in energy loss during the four-wheel drive control process, which also greatly increases the cost; adding rear axle drive to electric vehicl...

AI Technical Summary

Problems solved by technology

The centralized arrangement of multiple driving components will, on the one hand, lead to an increase in the cost of powertrain integration, and put forward higher requirements for the optimization of the overall layout design of the vehicle's front cabin; Meet the requirements of layout space

[0004] 3) Most of the existing hybrid four-wheel drive systems add rear axle drive motors on the basis of the original front axle hybrid system, without considering that the front axle drive system can be appropriately simplified and improved after adding the rear axle motor

[0005] Based on the above 2) and 3), the existing multi-mode hybrid electric four-wheel drive system can only be applied to medium and large vehicles due to high cost and inconvenient layout, but under some conditions it is still necessary to sacrifice electric drive performance in exchange for a feasible layout sex

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