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Sensing steering axis inclination and camber with an accelerometer

An accelerometer and acceleration technology, applied in the field of wheel alignment systems, can solve the problems of large sensors, damage accuracy, and high cost

Active Publication Date: 2006-05-03
SNAP ON INC (US)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These types of sensors may be less susceptible to wobble and other errors that optical sensors can experience
However reluctance and pendulum based components are susceptible to breakage and accuracy issues caused by mechanical shock
Additional drawbacks are that these types of sensors can often be large and difficult to manipulate, and are relatively expensive

Method used

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  • Sensing steering axis inclination and camber with an accelerometer
  • Sensing steering axis inclination and camber with an accelerometer
  • Sensing steering axis inclination and camber with an accelerometer

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Embodiment Construction

[0024] The disclosure is now described more fully with reference to the accompanying drawings in which several embodiments are shown. Those skilled in the art will recognize that methods, apparatus, systems, data structures, and computer readable media implement a feature, function, or mode of use described herein. For example, an apparatus embodiment may perform corresponding steps or actions of a method embodiment.

[0025] figure 1 Camber angles measured by an exemplary wheel alignment system are shown. Camber is the angle of the wheel 100 when viewed from the front of the vehicle, usually measured in degrees. If the top of the wheel 100 slopes outward from the center of the vehicle, the camber is positive, as indicated by angle 102 . If the top of the wheel 100 slopes inward toward the center of the vehicle, the camber is negative, as indicated by angle 104 .

[0026] figure 2 The bead measured by an exemplary wheel alignment system is shown. The bead of two adjacen...

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Abstract

Method and apparatus for measuring and calculating wheel alignment angles. During the alignment process, lightweight and mechanically robust accelerometers in the measuring head are attached to the wheels of the vehicle. The output of the accelerometer can be compensated for temperature or thermal hysteresis effects through a memory lookup or a temperature based feedback control loop.

Description

[0001] related application [0002] This application claims the benefit under 35 U.S.C. §119(e) of U.S. Provisional Patent Application No. 60 / 459,998, filed April 4, 2003, entitled "Convection Based Accelerometers for Sensing SAI and Camber" , which is hereby incorporated by reference in its entirety. technical field [0003] The disclosure herein relates to wheel alignment systems, and methods and apparatus for measuring various related parameters. More specifically, the present disclosure relates to the use of lightweight, mechanically robust inclination sensors in wheel alignment systems. Background technique [0004] Wheel alignment is the process of adjusting the angle of the wheels on a vehicle so that they are generally perpendicular to the ground and parallel to each other. The purpose of this adjustment is to obtain maximum tire life and to ensure that the vehicle goes straight when traveling on a straight and level road. [0005] In order to adjust the wheel ang...

Claims

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Application Information

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IPC IPC(8): G01B7/30G01B7/315
CPCG01B7/315G01B2210/28
Inventor 埃里克·F·布赖恩
Owner SNAP ON INC (US)
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