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Method for calculating automotive electronic differential based on raspberry pi and centripetal acceleration

A technology of automotive electronics and acceleration, applied in electric vehicles, power management, vehicle components, etc., can solve problems such as high requirements, complex practical operation, and large gaps.

Active Publication Date: 2018-09-14
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there are many related design schemes, the requirements for related equipment are relatively high, the actual operation is more difficult, and there is a large gap between actual implementation and theoretical calculation.

Method used

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  • Method for calculating automotive electronic differential based on raspberry pi and centripetal acceleration

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0059] Embodiment 1: as figure 1 As shown, (1) input the basic data of the initial vehicle driving on the computer terminal: friction coefficient μ=0.6; safety factor s=1.5; gravitational acceleration g=9.8N / Kg;

[0060] (2) When the car begins to turn or move in a curve, the two acceleration sensors at the front and rear of the car acquire centripetal acceleration information, namely ai (i=1, 2). Among them, if ai0 means the car turns right, and enter it into the Raspberry Pi. The high-frequency refresh data takes f=20Hz, that is, read and calculate 20 times per second, and input it into the Raspberry Pi , to participate in the calculation part. Take one of the frequencies as an example to obtain a1=+5m / s2, a2=+5m / s2.

[0061] The gravity sensor records the weight distribution of the car, and refreshes the data at a high frequency. Input the weight of each part, that is, mij (i=1,2; j=1,2) into the Raspberry Pi, and take one of the frequencies as an example to obtain m11=35...

Embodiment 2

[0092] Embodiment 2: The car makes a turn or curve motion on the ice road.

[0093] (1) Input the basic data of the initial car driving on the computer terminal: friction coefficient μ=0.2; safety factor s=1.5; gravitational acceleration g=9.8N / Kg;

[0094] (2) When the car begins to turn or move in a curve, the two acceleration sensors at the front and rear of the car acquire centripetal acceleration information, namely ai (i=1, 2). Among them, if ai0 means the car turns right, and enter it into the Raspberry Pi. The high-frequency refresh data takes f=20Hz, that is, read and calculate 20 times per second, and input it into the Raspberry Pi , to participate in the calculation part. Take one of the frequencies as an example to obtain a1=+5m / s2, a2=+5m / s2.

[0095] The gravity sensor records the weight distribution of the car, and refreshes the data at a high frequency. Input the weight of each part, that is, mij (i=1,2; j=1,2) into the Raspberry Pi, and take one of the frequen...

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Abstract

The invention relates to a method for calculating automotive electronic differential based on raspberry pi and centripetal acceleration and belongs to the technical field of electric automobile application. When an automobile steers or performs curve motion, the centripetal acceleration of the automobile is obtained through an acceleration sensor; steering angle speed is acquired through an automotive system, and the curvature radius of a curve walking path is obtained by combining with the running speed of the automobile; the pressures borne by four wheels of the automobile are obtained through pressure sensors, and weight distribution of the automobile is judged; collected data is utilized to calculated a related centripetal force and the maximum static friction force of the automobile,the centripetal forces corresponding to the speeds of the wheels are calculated through a basic differential theoretical formula and are compared with the maximum static friction force of the automobile; if the former is greater than the later, the differential theoretical formula can be adopted to obtain a calculation result; if not, speed reduction is performed to reach a safe speed range and obtain a running scheme.

Description

technical field [0001] The invention relates to a method for calculating automotive electronic differential speed based on Raspberry Pi and centripetal acceleration, and belongs to the technical field of electric vehicle applications. Background technique [0002] Climate change, energy and environmental issues are long-term problems faced by human society. At present, electric vehicles are the wind vane of the development of the automobile field. It is an important means to reduce greenhouse gas emissions in the transportation field and solve global climate change. In the car frame, the most important part is the differential, which is usually composed of planetary gears, planetary gear carriers (differential case), side gears and other parts. The power of the engine enters the differential through the transmission shaft, directly drives the planetary gear carrier, and then the planetary gear drives the left and right half shafts to drive the left and right wheels respecti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B60L15/20
CPCB60L15/2036B60L2240/46B60L2240/14B60L2240/10B60L2240/12Y02T10/72
Inventor 雷妍贾连印左渝灏胡俊涛沈兵林
Owner KUNMING UNIV OF SCI & TECH