Sensing steering axis inclination and camber with an accelerometer
First Claim
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1. A method for measuring a wheel alignment-related angle, the method comprising:
- providing a measurement head including an accelerometer, a thermal sensor and a compensator, the compensator comprising analog circuitry;
measuring, with the accelerometer, an uncompensated wheel alignment-related angle;
measuring, with the thermal sensor, a temperature to which the accelerometer is subjected; and
calculating a compensated wheel alignment-related angle as a function of the uncompensated wheel alignment-related angle and the measured temperature.
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Abstract
Methods and devices for measuring and calculating wheel alignment angles. Light weight and mechanically robust accelerometers in measurement heads are attached to a vehicle'"'"'s wheels during an alignment procedure. The output of the accelerometers may be compensated for effects of temperature or thermal hysteresis by memory lookup or a temperature based feedback control loop.
29 Citations
12 Claims
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1. A method for measuring a wheel alignment-related angle, the method comprising:
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providing a measurement head including an accelerometer, a thermal sensor and a compensator, the compensator comprising analog circuitry; measuring, with the accelerometer, an uncompensated wheel alignment-related angle; measuring, with the thermal sensor, a temperature to which the accelerometer is subjected; and calculating a compensated wheel alignment-related angle as a function of the uncompensated wheel alignment-related angle and the measured temperature. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A measurement head for a wheel alignment system, the measurement head comprising:
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an accelerometer configured to measure an uncompensated wheel alignment-related angle with respect to gravity; a thermal sensor configured to measure a temperature to which the accelerometer is subjected; and a compensator operatively coupled to the accelerometer and the thermal sensor and configured to calculate a compensated wheel alignment-related angle as a function of the uncompensated wheel alignment-related angle and the measured temperature, wherein the compensator comprises analog circuitry. - View Dependent Claims (8, 9, 10, 11, 12)
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Specification