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.
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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
20 Claims
- 1. A method for an engine, comprising, adjusting engine operation responsive to laser pulses received bouncing off a diaphragm in an engine manifold.
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12. 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; and adjusting engine operation based on a duration elapsed between the emitting and the receiving. - View Dependent Claims (13, 14, 15, 16)
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17. 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; and 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 (18, 19, 20)
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Specification