Method and system for laser pressure transducer
First Claim
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1. A method for an engine, comprising:
- adjusting engine operation responsive to laser pulses received bouncing off a diaphragm in an engine manifold, including estimating deflection of the diaphragm based on the laser pulses, estimating manifold pressure based on the deflection, and adjusting engine operation responsive to the estimated manifold pressure.
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Abstract
Methods and systems for provided for accurately estimating an engine intake or exhaust manifold pressure using a laser pressure transducer. Laser circuitry is coupled to a pressure sensitive diaphragm that is mounted to the engine manifold. Manifold pressure is inferred based on a deflection of the diaphragm, as estimated based on a timing between emission of a laser pulse into the diaphragm and detection of a reflected pulse from the diaphragm.
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Citations
18 Claims
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1. A method for an engine, comprising:
adjusting engine operation responsive to laser pulses received bouncing off a diaphragm in an engine manifold, including estimating deflection of the diaphragm based on the laser pulses, estimating manifold pressure based on the deflection, and adjusting engine operation responsive to the estimated manifold pressure. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method for an engine, comprising:
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emitting laser pulses toward a diaphragm coupled to an engine manifold from a laser mounted on the diaphragm; receiving laser pulses reflecting from an interior of the diaphragm opposite an interior of the manifold at a detector mounted to the diaphragm; adjusting engine operation based on a duration elapsed between the emitting and the receiving; and indicating a cylinder misfire event based on an estimated manifold pressure and further based on a cylinder spark timing. - View Dependent Claims (12, 13, 14)
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15. A vehicle system, comprising:
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an engine including an exhaust manifold; a diaphragm cast into the exhaust manifold wherein a top of the diaphragm is coupled to the exhaust manifold and a bottom of the diaphragm is positioned in an exhaust passage of the exhaust manifold; a diode laser and a laser detector coupled to the top of the diaphragm; a thermal sensor mounted to the top of the diaphragm for sensing infra-red radiation within the diaphragm; and a controller with computer readable instructions for; operating the laser to emit laser pulses to an interior of the diaphragm; detecting laser pulses reflected off the bottom of the diaphragm at the detector; based on a duration elapsed between a laser pulse being emitted and a reflected pulse being detected, estimating a manifold pressure; and adjusting an engine operating parameter based on the estimated manifold pressure. - View Dependent Claims (16, 17, 18)
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Specification