초록 ▼

In order to accomplish aforementioned and other objects, a spark ignition timing control system, according to the present invention, is adapted to perform spark ignition timing control for an internal combustion engine combustioning a blended fuel, such as gasoline/alcohol mixture fuel. The control

In order to accomplish aforementioned and other objects, a spark ignition timing control system, according to the present invention, is adapted to perform spark ignition timing control for an internal combustion engine combustioning a blended fuel, such as gasoline/alcohol mixture fuel. The control system performs MBT control by adjusting spark advance angle toward a maximum pressure point in feedback manner. The spark advance angle derived in MBT control is modified with a correction value derived on the combustion propagation speed which is variable depending upon blending ratio of one of the fuels in the blended fuel.

대표청구항 ▼

A spark ignition timing control system for an internal combustion engine adapted for combustioning with a fuel composed of more than one mutually different fuels, comprising: first sensor means for monitoring a preselected basic engine operating parameters to produce a first sensor signal representa

A spark ignition timing control system for an internal combustion engine adapted for combustioning with a fuel composed of more than one mutually different fuels, comprising: first sensor means for monitoring a preselected basic engine operating parameters to produce a first sensor signal representative of the monitored engine operating condition; second sensor means for monitoring variation of internal pressure in an engine cylinder to produce a second sensor signal indicative of the monitored internal pressure; third means for deriving a basic fuel advance angle on the basis of said first sensor signal, fourth means for detecting lag period between spark ignition and occurrence of the maximum pressure in said engine cylinder to predict concentration of the selected one of the fuels in said blended fuel; fifth means for deriving a first correction value on the basis of said second sensor signal; sixth means for deriving a second correction value on the basis of the predicted concentration of the selected one of the fuels; and seventh means for correcting said basic fuel advance angle with said first and second correction values for deriving a spark advance angle to control the spark ignition timing.