Electric automobile double-motor driving system and control method thereof

A dual-motor drive, electric vehicle technology, applied in electric vehicles, control drives, control devices, etc., can solve problems such as low motor power consumption efficiency

Active Publication Date: 2019-03-22
智一新能源发展有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, traditional low-speed four-wheel electric vehicles generally adopt the direct drive mode of the motor, but as we all know, the motor cannot fully cover the comprehensive efficiency of high speed and low speed, and at the same time face the working state of high torque when starting at low speed , thus causing the problem that the electric efficiency of the motor is too low

Method used

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  • Electric automobile double-motor driving system and control method thereof
  • Electric automobile double-motor driving system and control method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] see figure 1 As shown, a dual-motor drive system for an electric vehicle includes a drive main battery 1 , a first integrated controller 2 , a first drive motor 3 , a second integrated controller 4 , a second drive motor 5 and a double-input gearbox 6 .

[0050] The double-input reduction box 6 consists of a casing 61, a first input shaft 62, a first driving gear 63, a second input shaft 64, a second driving gear 65, a first driven gear 66, an output shaft 67 and a second driven gear. Moving gear 68 forms.

[0051] The first input shaft 62 , the second input shaft 64 and the output shaft 67 are arranged in parallel in order from top to bottom in the box body 61 , and the first driving gear 63 is sheathed on the first drive gear 63 . On an input shaft 62, the second driving gear 65 and the first driven gear 66 are sleeved on the second input shaft 64, and the second driven gear 68 is sleeved on the output shaft 67 , and the first driving gear 63 meshes with the first d...

Embodiment 2

[0059] see figure 2 As shown, a dual-motor drive system for an electric vehicle includes a drive main battery 1 , a first integrated controller 2 , a first drive motor 3 , a second integrated controller 4 , a second drive motor 5 and a double-input gearbox 6 .

[0060] The double-input reduction box 6 consists of a casing 61, a first input shaft 62, a first driving gear 63, a second input shaft 64, a second driving gear 65, a first driven gear 66, an output shaft 67 and a second driven gear. Moving gear 68 forms.

[0061] The first input shaft 62 , the second input shaft 64 and the output shaft 67 are horizontally arranged in the box body 61 , and the first input shaft 62 and the second input shaft 64 are respectively located at the The left and right ends above the output shaft 67, the first driving gear 63 is sleeved on the first input shaft 62, the second driving gear 65 is sleeved on the second input shaft 64, the The first driven gear 66 and the second driven gear 68 a...

Embodiment 3

[0065]In Embodiment 1, the speed ratio of the first driving gear 63 to the first driven gear 66 is 2.2, and the speed ratio of the second driving gear 65 to the second driven gear 68 is 5.8 is a preferred embodiment, the reduction ratio of the low gear is calculated as 2.2*5.8=12.76, the reduction ratio of the high gear is 5.8, and the empty vehicle is calculated as 600 kg, then the first drive motor 3 responsible for the low gear is estimated to support a maximum speed of 25 ~30 kilometers, the speed that the second drive motor 5 that is responsible for the high speed gear can support is 30~70 kilometers per hour.

[0066] It should be noted that due to the large speed difference between the two motors, the selection of bearings in actual use needs to take into account the carrying capacity of the no-load speed. For example, the rated speed of the motor is 3000. When the vehicle is running at high speed, the idling speed of the first driving motor is likely to reach more than...

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Abstract

The invention discloses an electric automobile double-motor driving system and a control method thereof. The system comprises a driving main battery, a first comprehensive controller, a first drivingmotor, a second comprehensive controller, a second driving motor and a double-input reduction gearbox, wherein the ratio of the reduction ratio of the low gear to the high gear in the double-input reduction box is 2-3; the control method comprises the following steps of: enabling one high-speed motor to be in charge of low gear operation through the differential speed of two input shafts and matching with a corresponding control strategy, solving the problem of low-speed large current, improving the loading capacity and the climbing capacity of a vehicle, enabling the other high-speed motor tobe in charge of high gear operation so as to give consideration to low-speed high-torque output and high-speed high-rotation-speed efficiency. The invention relates to a driving system which is builtin order to improve the power problem of the current new standard medium-low speed electric four-wheel vehicle, and can be used as a transition scheme before a new special gearbox is released, and aims to solve the problem that the power utilization efficiency of the existing motor direct-drive low-speed four-wheel vehicle is too low.

Description

technical field [0001] The invention belongs to the technical field of new energy vehicles, and in particular relates to an electric vehicle dual-motor drive system and a control method thereof. Background technique [0002] Nowadays, new energy vehicles have become the development direction of future transportation tools. The purpose is to use new energy power to replace traditional petrochemical energy power with high energy consumption and high emissions, so as to solve the problems of global environmental pollution and petrochemical resource depletion. As one of the typical representatives of new energy vehicles, pure electric vehicles have also been well known by consumers, and with the maturity of power lithium battery technology, the number of pure electric vehicles on the market is also increasing. [0003] At present, traditional low-speed four-wheel electric vehicles generally adopt the direct drive mode of the motor, but as we all know, the motor cannot fully cove...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B60K1/02B60K17/04B60L15/20B60L15/32
CPCB60K1/02B60K17/04B60L15/20B60L15/32B60L2220/42Y02T10/72
Inventor 樊朝晖彭旭华李新民左臣伟
Owner 智一新能源发展有限公司
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