Machine fluid sensor
First Claim
1. A fluid sensor for sensing one or more properties of a fluid in a vehicle, said sensor comprising:
- a tuning fork resonator for contacting said fluid when the sensor is mounted on the vehicle,said tuning fork resonator comprising two tines and being operable when mounted on said vehicle to receive an input signal and to oscillate so that the two tines move in opposite phase at a frequency of less than 1 MHz while in contact with said fluid to generate a resonator response indicative of said one or more properties of said fluid.
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Accused Products
Abstract
A sensor for sensing one or more properties of a vehicle fluid has a tuning fork resonator adapted to contact the fluid. The tuning fork resonator comprises two tines and is operable to oscillate so that the two tines move in opposite phase at a frequency of less than 1 MHz while contacting the fluid to generate a resonator response indicative of one or more properties of the fluid. In another aspect, a sensor includes a substrate and a flexural resonator on the substrate and adapted to contact the fluid. Circuitry for operation of the resonator is on the substrate. The resonator is adapted to receive an input signal and to oscillate while contacting the fluid to generate a resonator response indicative of one or more properties of the fluid. One suitable application for the invention is monitoring the condition of a vehicle engine oil.
214 Citations
43 Claims
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1. A fluid sensor for sensing one or more properties of a fluid in a vehicle, said sensor comprising:
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a tuning fork resonator for contacting said fluid when the sensor is mounted on the vehicle, said tuning fork resonator comprising two tines and being operable when mounted on said vehicle to receive an input signal and to oscillate so that the two tines move in opposite phase at a frequency of less than 1 MHz while in contact with said fluid to generate a resonator response indicative of said one or more properties of said fluid. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
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20. A fluid sensor for sensing one or more properties of a fluid in a vehicle, said sensor comprising:
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a substrate; a flexural resonator on the substrate for contacting said fluid when the substrate and sensor are mounted on the vehicle; and circuitry on the substrate for operation of the resonator, said resonator being adapted to receive an input signal and to oscillate while in contact with said fluid to generate a resonator response indicative of said one or more properties of said fluid, wherein said vehicle fluid is engine oil, and wherein the flexural resonator is coated over at least a portion of its surface with a material resistant to corrosion from the engine oil or to the build-up of contaminants present in the engine oil. - View Dependent Claims (21, 22, 23, 24, 25, 26)
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27. A fluid sensor for sensing one or more properties of a fluid in a vehicle, said sensor comprising:
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a substrate; a flexural resonator on the substrate for contacting said fluid when the substrate and sensor are mounted on the vehicle; circuitry on the substrate for operation of the resonator, said resonator being adapted to receive an input signal and to oscillate while in contact with said fluid to generate a resonator response indicative of said one or more properties of said fluid; and at least one connector for connecting the flexural resonator with a source of said input signal on board said vehicle. - View Dependent Claims (28, 29, 30, 31, 32, 33, 34, 35)
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36. A fluid sensor for sensing one or more properties of a fluid in a vehicle, said sensor comprising:
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a substrate; a flexural resonator on the substrate for contacting said fluid when the substrate and sensor are mounted on the vehicle; and circuitry on the substrate for operation of the resonator, said resonator being adapted to receive an input signal and to oscillate while in contact with said fluid to generate a resonator response indicative of said one or more properties of said fluid, wherein said one or more fluid properties includes at least the density of the fluid and the viscosity of the fluid independent of the density. - View Dependent Claims (37, 38, 39, 40, 41, 42, 43)
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Specification