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

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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 frequ

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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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Example Embodiment

[0027] The present invention will be described below with reference to the drawings.

[0028] In this embodiment, four-wheel drive torque distribution for an electric vehicle, comprising the steps of:

[0029] like figure 1 As shown, S1 forward gear driving cycle:

[0030] Stage 1: forward gear when creep driving conditions, the vehicle speed is ≤V D蠕行max And the total torque demand is below Tq Dmax When, the motor is independently controlled rear axle creep torque output control "idle" is not the output torque of the motor of the front axle load of the idle forward low torque Tq 闲置小扭矩 .

[0031] Stage 2: When the vehicle is in forward gear speed driving condition, V D蠕行max D驱动max The total torque demand ≤Tq Dmax And when it is determined that the vehicle acceleration value unchanged or increased acceleration value, the rear axle motor in response to the control demand total torque output independent drive torque control "idle" is not the output torque of the motor of the front ax...

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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
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