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Electric vehicle four-wheel-drive torque distribution method and system and vehicle

A technology for torque distribution and electric vehicles, which is applied in electric vehicles, vehicle components, motors, etc., can solve problems such as poor power performance, poor driving comfort for users, impact, etc., and achieve the goal of improving driving comfort and power performance Effect

Active Publication Date: 2021-08-31
CHONGQING CHANGAN AUTOMOBILE CO LTD +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a four-wheel drive torque distribution method, system and vehicle for an electric vehicle, so as to solve the problem of switching between forward and reverse directions of torque in low-speed working conditions due to gaps in the electric drive system that frequently occur in existing four-wheel drive torque distribution schemes. Impact, resulting in poor driving comfort for users; and solving the problem of poor power performance caused by the electric drive system needing to overcome the gap before outputting power in the existing four-wheel drive torque distribution scheme

Method used

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  • Electric vehicle four-wheel-drive torque distribution method and system and vehicle
  • Electric vehicle four-wheel-drive torque distribution method and system and vehicle

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Embodiment Construction

[0027] The present invention is optionally described below in conjunction with the accompanying drawings.

[0028] In this embodiment, a four-wheel drive torque distribution method for an electric vehicle includes the following steps:

[0029] Such as figure 1 As shown, S1. Forward gear driving condition:

[0030] Stage 1: When the vehicle is in the forward gear creeping condition, the vehicle speed ≤ V D蠕行max And the total torque demand is lower than Tq Dmax When , the rear axle motor is controlled to output creep torque independently, and the front axle motor that controls the "idle" non-output torque loads the positive idle small torque Tq 闲置小扭矩 .

[0031] Stage 2: When the vehicle is in forward gear and accelerating, V D蠕行max D驱动max , total torque demand ≤ Tq Dmax , and it is judged that the acceleration value of the vehicle remains unchanged or the acceleration value increases, the rear axle motor is controlled to independently output the driving torque in response ...

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Abstract

The invention discloses an electric vehicle four-wheel-drive torque distribution method and system and a vehicle. Through application of preloaded idle small torques, the whole vehicle can preload different idle small torques based on different four-wheel-drive torque distribution schemes under various working conditions during forward gear driving and reverse gear driving, the problems that power output response is slow and impact is generated due to forward and reverse switching of torque under the low-speed working condition are solved, the dynamic property of the electric automobile is effectively improved, and the driving and riding comfort of the electric automobile is improved.

Description

technical field [0001] The invention belongs to the technical field of electric vehicle control, and in particular relates to a four-wheel drive torque distribution method, system and vehicle of an electric vehicle. Background technique [0002] In order to provide the power and passability of electric vehicles, some electric vehicles are currently designed with a four-wheel drive mode, which controls the front axle motor and the rear axle motor to output torque according to a certain distribution ratio, based on the state of the vehicle (such as: high-voltage battery power, vehicle speed, system failure state), working conditions (such as: curves, ramps, highways, snow, mud, sand), user operations (such as: acceleration, braking, steering, forward, backward) and other factors The motor output torque ratio is adjusted in real time. [0003] For the general four-wheel drive torque distribution scheme, the following problems still inevitably exist in practical applications: F...

Claims

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Application Information

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IPC IPC(8): B60L15/32
CPCB60L15/32B60L2240/12B60L2240/14B60L2240/423B60L2260/28Y02T10/64Y02T10/72
Inventor 陈东高波孔权翟钧唐先尧
Owner CHONGQING CHANGAN AUTOMOBILE CO LTD