Automotive cold start fuel volatility compensation

Details Automotive cold start fuel volatility compensation Automotive cold start fuel volatility compensation

1998-04-29

2000-06-27

Solis, Erick R.

Internal-combustion engines

Charge forming device

Including exhaust gas condition responsive means

123491, 701113, F02D 4100

Patent

active

060793961

ABSTRACT:
Automotive internal combustion engine fuel volatility is estimated during cold start operations by stabilizing air admission to the engine and analyzing engine speed over a modeling period following an engine coldstart after engine speed has stabilized and prior to closed-loop engine operation. If engine speed deviates significantly away from an expected engine speed for the current engine intake air and fuel, a fuel volatility deviation is diagnosed. The magnitude of the fuel volatility deviation away from a nominal fuel volatility is determined as a function of the magnitude of the engine speed deviation. A fuel volatility correction value is updated as a function of the engine speed deviation and is applied throughout an ignition cycle, including during the modeling period to compensate for the fuel volatility deviation.

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