VEHICLE METHOD FOR BAROMETRIC PRESSURE IDENTIFICATION
First Claim
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1. A vehicle method, comprising:
- adjusting engine operation responsive to barometric pressure, the barometric pressure based on a pressure change in a sector of the fuel system when the sector is sealed with the vehicle travelling.
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Abstract
A vehicle method for barometric pressure identification, including adjusting engine operation responsive to barometric pressure, the barometric pressure based on a pressure change at a sector of the fuel system when the sector is sealed with the vehicle travelling. The method may utilize a pressure change at the sealed sector of the fuel system, such as a sealed fuel tank, to identify barometric pressure, even with the engine off for extended durations of vehicle travel. As such, in a hybrid-vehicle application, including during hill descents in which the engine is maintained off, barometric pressure can still be updated.
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Citations
19 Claims
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1. A vehicle method, comprising:
adjusting engine operation responsive to barometric pressure, the barometric pressure based on a pressure change in a sector of the fuel system when the sector is sealed with the vehicle travelling. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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18. A vehicle method, comprising:
adjusting engine operation responsive to barometric pressure, the barometric pressure estimated based on a relative pressure change in a sealed fuel system over a threshold distance traveled by the vehicle with the engine remaining deactivated at rest and a fuel pump deactivated.
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19. A system for controlling a vehicle propulsion system in a vehicle comprising:
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an engine; a mass airflow sensor; a fuel tank having a relative pressure sensor; a fuel tank isolation valve; and a controller having instruction executable to; during a first mode with the engine spinning, estimate barometric pressure based on the mass airflow sensor, engine speed, and throttle position; and during a second mode with the engine off, estimate barometric pressure based on a change in the relative pressure in the fuel tank with the tank sealed by the fuel tank isolation valve; and adjust engine operation based on the estimated barometric pressures.
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Specification