Vehicle engine control system utilizing humidity sensor
First Claim
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1. A method for controlling an internal combustion engine of a vehicle, the engine having a humidity sensor, the method comprising:
- adjusting a fuel injection amount into the engine based on said humidity sensor;
adjusting flow through the engine based on said humidity sensor;
determining degradation of the humidity sensor; and
using default settings in response to a determination of degradation of the humidity sensor.
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Abstract
A system and method for utilizing a humidity sensor with an internal combustion engine of a vehicle is described. Specifically, information from the humidity sensor is used to adjust a desired air-fuel ratio to reduce engine misfire while improving vehicle fuel economy. Further, such information is also used to adjust timing and/or lift of the valve in the engine cylinder. Finally, diagnostic routines are also described.
46 Citations
20 Claims
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1. A method for controlling an internal combustion engine of a vehicle, the engine having a humidity sensor, the method comprising:
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adjusting a fuel injection amount into the engine based on said humidity sensor; adjusting flow through the engine based on said humidity sensor; determining degradation of the humidity sensor; and using default settings in response to a determination of degradation of the humidity sensor. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method for controlling an internal combustion engine of a vehicle, the engine having a humidity sensor, the method comprising:
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adjusting a fuel injection amount into the engine based on said humidity sensor; adjusting a residual amount of gas residuals in the cylinder based on humidity sensor; determining degradation of the humidity sensor; and using default settings in response to a determination of degradation of the humidity sensor. - View Dependent Claims (12, 13, 14)
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15. An engine system for a vehicle, comprising:
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a humidity sensor; at least one combustion chamber; a fuel injector for delivering fuel to the combustion chamber; an intake passage for supplying air to the combustion chamber; a valve disposed along the intake passage for regulating an amount of air supplied to the combustion chamber; and a control system for; adjusting a ratio of air to fuel that is delivered to the combustion chamber based on said humidity sensor by adjusting at least one of a condition of the fuel injector and a condition of the valve; determining degradation of the humidity sensor; and using a default setting in response to a determination of degradation of the humidity sensor. - View Dependent Claims (16, 17, 18, 19, 20)
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Specification