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Wheel alignment apparatus and method for vehicles with electromechanical power steering

A power steering, electro-mechanical technology, applied in the direction of using optical devices, instruments, measuring devices, etc., can solve problems such as inappropriate perception

Active Publication Date: 2019-03-15
SNAP ON INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the ECM will recognize this difference and interpret it as a need for torque assist (i.e., power steering), and the ECM sends commands to the electric motor to provide the power assist that will steer the vehicle, which causes the driver of the vehicle to Inappropriate perception of "pull" often associated with improper wheel alignment

Method used

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  • Wheel alignment apparatus and method for vehicles with electromechanical power steering
  • Wheel alignment apparatus and method for vehicles with electromechanical power steering
  • Wheel alignment apparatus and method for vehicles with electromechanical power steering

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Embodiment Construction

[0019] According to the disclosed system and method, first, the rear wheels of the vehicle are positioned, the thrust angle of the rear wheels is calculated, and then the front wheels' pitch is adjusted using conventional positioning systems such as imaging locators utilizing on-wheel targets as discussed herein. Caster and Camber. Then, the steering wheel is leveled using the vehicle's EPS system (ie, with the engine running), and the respective toe angles of the right and left front wheels are sequentially adjusted.

[0020] Steering wheel level is monitored during toe adjustment using a graphically displayed steering wheel level indicator based on the individual toe angles relative to thrust angle. If the level of the steering wheel has moved more than a predetermined angle after adjusting the toe angle of one wheel, reset the steering wheel to the horizontal position and readjust the toe angle of that wheel as necessary before proceeding. Toe adjustment is complete when t...

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Abstract

A method and apparatus are provided for aligning wheels of a vehicle equipped with an electromechanical power steering system having a steering angle sensor, a torque sensor, and a torsion bar connecting the steering angle sensor and the torque sensor. Embodiments include: moving the steering wheel of the vehicle to a horizontal position such that substantially no torque is applied to the torsion bar; after the steering wheel is moved to the horizontal position, adjusting the toe angle of a first of the front wheels of the vehicle; and after adjusting When adjusting the toe angle of the first of the front wheels, if the steering wheel has moved more than a predetermined angle from the horizontal position, moving the steering wheel back substantially to the horizontal position and then readjusting the toe angle of the first of the front wheels.

Description

technical field [0001] The subject of the invention relates to a wheel alignment. The subject matter of the invention is particularly suitable for wheel alignment of vehicles equipped with organic electric power steering systems. Background technique [0002] Current conventional wheel alignment systems use sensors or probes attached to the wheels to measure various angles of the wheel and suspension. These angles are communicated to the host system where they are used to calculate the vehicle orientation angles. In a standard conventional locator configuration, the wheel has four locator probes attached. Each sensor head includes two horizontal or toe measurement sensors and two vertical or camber / pitch sensors. Each sensor probe also includes electronics to support overall sensor data acquisition and communicate with the positioner console, local user input, and local display for status feedback, diagnostics, and calibration support. [0003] In recent years, computer-...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01B11/275
CPCG01B21/26G01B2210/143G01B2210/30G01B11/275
Inventor 罗纳德·拉辛
Owner SNAP ON INC