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Method for detecting backlash

A backlash and measurement error technology, applied in the field of gap crossing

Active Publication Date: 2018-04-10
FORD GLOBAL TECH LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] It is extremely challenging to reliably detect dead zone crossings using the measurements available to vehicles today

Method used

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  • Method for detecting backlash
  • Method for detecting backlash
  • Method for detecting backlash

Examples

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Embodiment Construction

[0017] figure 1 A drive train 10 is shown having two shafts 12 , 14 connected by a torsional discontinuity 16 in which backlash may occur. pass figure 2 The discontinuity 16 is represented by meshing gears 18 , 20 , each fixed to one of the shafts 12 , 14 . The magnetoelastic shaft torque sensor 24 suitable for mass production and capable of directly measuring the torque at the transmission input shaft or output shaft realizes many functions in vehicle control. The dynamic response of axle torque sensor 24 is within a fraction of a millisecond, which far exceeds any currently available on-board torque estimate. Therefore, this torque measurement enables robust backlash detection and useful feedback for motor vehicle drivability control.

[0018] image 3 is a graph showing the change in driveline torque τ and twist θ from negative torsion angles to positive torque angles (including discontinuities θn, θp entering or leaving lash region 26 (ie, gap crossing).

[0019] In ...

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Abstract

A method for detecting backlash and adjusting driveline variables that includes measuring the torque transmitted between components on either side of a torsional discontinuity, measuring driveline twist across the discontinuity, using the ratio of driveline twist divided by torque and the driveline The inverse of the stiffness to determine if the driveline is entering, leaving or in the backlash zone and uses the driveline twist and torque measured in the backlash zone to adjust the reference values ​​for driveline twist and torque.

Description

technical field [0001] The present invention relates generally to the detection of lash crossings in a motor vehicle driveline, in particular through the use of means for generating a signal indicative of the amount of torque currently being transmitted and the sense of direction of the transmitted torque. Background technique [0002] Such as figure 1 with figure 2 As shown, an automotive powertrain includes meshing gear teeth wherein a dead zone exists between the teeth when the direction of torque applied to the meshing gear teeth changes. [0003] Due to the specific compliance of the shaft, this dead zone can lead to discontinuities in torque transmission and jerk excitation of the drive train. Therefore, the dead zone is often referred to as "backlash" or during a change in torque direction ("backlash crossing"). If there is no backlash associated with the meshing gears, the relationship between shaft twist (t) and torque (q) can be expressed using the torsional sp...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01M13/02
CPCG01L3/02G01M13/021
Inventor 戴安娜·亚纳基耶夫埃里克·H·曾格雷戈里·M·皮特伦藤井雄二
Owner FORD GLOBAL TECH LLC
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