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Four wheel electronic differential speed steering control system

A technology of steering control and electronic differential speed, which is applied in the direction of automatic steering control components, steering mechanisms, steering rods, etc., can solve the problems of increasing friction between the wheel and the ground, accelerating wheel wear, and noise, so as to prolong the service life and reduce the noise. The effect of small friction

Inactive Publication Date: 2004-02-18
同济大学新能源汽车工程中心 +1
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Problems solved by technology

[0002] At present, the power of a traditional car is not directly transmitted to the wheels in its initial state, but is driven by several devices such as clutch-transmission-transmission shaft-differential-half shaft. This set of transmission mechanism structure Complex, prone to problems such as vibration and noise
[0003] The four-wheel drive electric vehicle is driven by four hub motors respectively, which omits the transmission system of the traditional vehicle, making the structure of the electric vehicle more concise and increasing the effective space; but due to the four wheels driven by the hub motor The rotation speed is the same, so when the electric vehicle needs to turn, the rotation speed of some wheels is too fast or too slow, which will cause the car to turn difficult, and some wheels will slide relative to the ground, thereby increasing the distance between the wheel and the ground. Friction, accelerate the wear of the wheels, and even cause damage to other parts of the car

Method used

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  • Four wheel electronic differential speed steering control system
  • Four wheel electronic differential speed steering control system
  • Four wheel electronic differential speed steering control system

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Embodiment Construction

[0020] In order to ensure that the pure rolling state is always maintained between each wheel and the ground, such as figure 1 Taking the kinematics relationship of four-wheel drive and front two-wheel steering as an example, the general relational expression between the rotation speed of each wheel and the steering angle of the wheel is derived, so as to establish the relationship between the rotation speed of each wheel under different steering angle conditions, n1 is Calibration speed, the wheel is the outer front wheel, n2 indicates the rotational speed of the inner front wheel, n3 indicates the rotational speed of the outer rear wheel, and n4 indicates the rotational speed of the inner rear wheel.

[0021] Because during the rotation of the car, the rotation angular velocity of its four wheels should be equal, but the rotation speed is proportional to the radius of rotation of its circumference, so n2 / n1=R2 / R1, so according to figure 1 As shown, the following formula is o...

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Abstract

An electronic differential steering control system for 4 wheels is composed of motors, steering mechanism, braking unit, accelerating switch, motor conrollers, angle displacement sensors, rotation speed sensors, and CPU which can acquire all signals, calculating the target rotation speed of each wheel, and issuring relative instruction to regulate the rotation speed of each wheel. It can ensure the pure rolling between wheel and ground to decrease friction and elongate service life of each part.

Description

technical field [0001] The invention belongs to an automobile steering control system, in particular to a four-wheel electronic differential steering control system of an electric automobile. technical background [0002] At present, the power of a traditional car is not directly transmitted to the wheels in its initial state, but is driven by several devices such as clutch-transmission-transmission shaft-differential-half shaft. This set of transmission mechanism structure Complex, prone to vibration, noise and other problems. [0003] The four-wheel drive electric vehicle is driven by four hub motors respectively, which omits the transmission system of the traditional vehicle, making the structure of the electric vehicle more concise and increasing the effective space; but due to the four wheels driven by the hub motor The rotation speed is the same, so when the electric vehicle needs to turn, there are some wheels whose rotation speed is too fast or too slow, which will ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B62D6/00
Inventor 万钢陈辛波余卓平沈勇
Owner 同济大学新能源汽车工程中心
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