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Four-wheel drive electric vehicle power system and control method

A technology for power systems and electric vehicles, applied in motor vehicles, power plants, hybrid vehicles, etc., can solve the problems of low engine load rate, difficult cabin layout, complex system structure, etc., so as to improve the engine load rate, axial The effect of compact size and simplified transmission system

Active Publication Date: 2018-06-26
CHINA FIRST AUTOMOBILE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, in the systems disclosed in Patent Document 1 and Patent Document 2, the front axle assembly includes a transmission, the system structure is complex, the axial dimension is large, the cabin layout is difficult, and the cost is high; in addition, the systems are matched with high-power Level engine, in daily use, the engine load rate is low, the fuel consumption is high, and the emission is poor

Method used

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  • Four-wheel drive electric vehicle power system and control method
  • Four-wheel drive electric vehicle power system and control method

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Embodiment 1

[0028] This embodiment provides a four-wheel drive electric vehicle power system, which includes an engine 1, a shock absorber 2, a first motor 3, a clutch 4, a second motor 5, a first inverter 6, and a second inverter 7 and power battery 8 .

[0029] The engine is connected to the shock absorber, the shock absorber is connected to the first electric motor, the first electric motor is connected to the clutch, and the clutch outputs power to the front wheels of the vehicle through the final reducer and the differential of the front axle of the vehicle. The electric motor outputs power to the rear wheels of the vehicle through the final reducer and the differential on the rear axle of the vehicle.

[0030] The maximum power of the engine is matched according to the maximum stable speed of the vehicle, not according to the acceleration of the vehicle, for example, its power can be 20-80KW. The engine can directly drive the wheels, the rated power of the first electric motor is m...

Embodiment 2

[0036] This embodiment provides a control method for the four-wheel drive electric vehicle power system described in Embodiment 1, which includes the following steps:

[0037] S10. Select a control mode, where the control mode includes: a regular mode and a long-distance mode;

[0038] Among them: in the normal mode, according to the battery power, the vehicle working mode is divided into the charge depleting (CD) stage and the charge sustaining (charge sustaining, CS) stage; when the battery power is greater than a certain threshold, the power system is in the CD stage , when the battery power is less than or equal to a certain threshold, the power system is in the CS stage; for example, when the power battery power is higher than 40%, the power system works in the CD stage; when the power battery power drops below 40% or 35%, the power system The system enters the CS phase.

[0039] Among them, in the CD stage, the vehicle works in pure electric mode, the engine is stopped,...

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Abstract

The invention discloses a power system of a four-wheel-drive electric vehicle. The power system comprises an engine, a shock absorber, a first motor, a clutch, a second motor, a first inverter, a second inverter and a power battery, wherein the engine is connected with the shock absorber, and the shock absorber is connected with the first motor which is connected with the clutch; the power battery is connected with a first motor circuit through the first inverter and is connected with a second motor circuit through the second inverter. A transmission is omitted for the power system of the four-wheel-drive electric vehicle, a drive system is simplified greatly, compartment arrangement space is saved, the number of parts is reduced, and the cost of the power system of the four-wheel-drive electric vehicle is reduced; four-wheel drive is realized through a bridge, driving torque of a front axle and a rear axle of the vehicle can be distributed reasonably according to the ground adhesive force and vehicle demanded torque, and the power performance of the whole vehicle is guaranteed. The invention further discloses a control method of the power system of the four-wheel-drive electric vehicle.

Description

technical field [0001] The invention belongs to the field of electric vehicles, and relates to a four-wheel drive electric vehicle, in particular to a four-wheel drive electric vehicle power system and a control method thereof. Background technique [0002] With the further aggravation of energy crisis and environmental deterioration, energy saving and environmental protection have become the themes of modern automobile development. Traditional four-wheel drive vehicles have better power and off-road performance than two-wheel drive vehicles, but their fuel consumption and emissions are also relatively high, so major automakers have begun to compete to develop four-wheel drive electric vehicles with good fuel economy and emissions. Cars to replace traditional four-wheel drive vehicles. [0003] Patent Document 1 (CN104175858A) discloses a four-wheel drive hybrid power system, including a power battery, a front drive unit and a rear drive unit, the front drive unit includes ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B60K6/52B60K6/42B60W20/20
CPCB60K6/42B60K6/52B60W20/20Y02T10/62
Inventor 赵洪辉杨兴旺刘建康王燕郑益红
Owner CHINA FIRST AUTOMOBILE
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