Cross-oil instrument having testing apparatus for vehicular sensor disconnection indication
First Claim
1. An apparatus for testing a cross-coil vehicular instrument having a pointer, a deflection of which is responsive to a vehicular condition signal and a sensor for sensing a vehicular condition signal and a sensor for sensing a vehicular condition to generate an output signal of a frequency indicative of the sensed vehicular condition, said apparatus comprising:
- frequency-to-analog converter means for generating said vehicular condition signal to said cross-coil vehicular instrument in response to a frequency of an applied input signal, said frequency-to-analog converter means having an input receiving said sensor output signal;
a test signal generator responsive to a command signal for generating a test signal of a predetermined frequency to be applied to said input of said frequency-to-analog converter means; and
control means coupled to said vehicular condition sensor for detecting a disconnection fault to generate said command signal to said test signal generator whereby said test signal is applied to the input of said frequency-to-analog converter means.
1 Assignment
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Accused Products
Abstract
An apparatus for testing a cross-coil instrument having a pointer, a sensor for sensing a condition to produce a sensor signal indicative of the sensed condition, and a converter coupled to the sensor for converting the sensor signal to a deflection of the pointer. The apparatus comprises a fault detector coupled to the sensor for detecting a disconnection fault to produce a command signal, and a test signal generator responsive to the command signal for generating a predetermined test signal to the converter, thereby moving the pointer to a predetermined position. The operation accuracy of the cross-coil instrument may be checked from the difference between the actual and predetermined pointer positions when a connector provided in a signal line between the sensor and the fault detector is pulled out.
11 Citations
11 Claims
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1. An apparatus for testing a cross-coil vehicular instrument having a pointer, a deflection of which is responsive to a vehicular condition signal and a sensor for sensing a vehicular condition signal and a sensor for sensing a vehicular condition to generate an output signal of a frequency indicative of the sensed vehicular condition, said apparatus comprising:
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frequency-to-analog converter means for generating said vehicular condition signal to said cross-coil vehicular instrument in response to a frequency of an applied input signal, said frequency-to-analog converter means having an input receiving said sensor output signal; a test signal generator responsive to a command signal for generating a test signal of a predetermined frequency to be applied to said input of said frequency-to-analog converter means; and control means coupled to said vehicular condition sensor for detecting a disconnection fault to generate said command signal to said test signal generator whereby said test signal is applied to the input of said frequency-to-analog converter means. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. An apparatus for in-line testing of a cross-coil vehicular instrument used in combination with a vehicular condition sensor which generates an output signal having a frequency responsive to a condition of a vehicle and wherein said cross-coil vehicular condition instrument is responsive to an electrical parameter of an applied vehicular condition signal, said in-line testing apparatus comprising:
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failure detecting means for generating a command signal in response to detecting a fault condition of said output signal generated by said vehicular condition sensor; test signal generator means for generating a test signal having a predetermined frequency; combining means for combining said vehicular sensor output signal and said test signal and generating a combined output signal; and means for applying said combined output signal to said cross-coil vehicular instrument. - View Dependent Claims (10, 11)
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Specification