Patent ID: 6609509
Filing Date: 2003-08-26
Classification: F02D,F02M,Y02T

Abstract:
An LPG-engine fuel control apparatus arranged such that LPG decompressed by an LPG regulator is fed as primary fuel into an LPG engine from a carburetor through an intake passage; the LPG decompressed is fed as supplementary fuel for supplementing the primary fuel from supplementary-fuel feeding means into the LPG engine through the intake passage; an air/fuel ratio between the primary fuel and the supplementary fuel and air that are fed is detected by air/fuel-ratio detecting means; the supplementary-fuel feeding means is controlled according to a required control variable to cause the detected air/fuel ratio to be a predetermined stoichiometric air/fuel ratio; and in an idle operation of the LPG engine, an optimum state of the control variable with respect to a predetermined target value is output from monitoring output means and monitored, slow-fuel adjusting means provided in a slow passage of the LPG regulator is operated to cause the control variable to be the target value, and an idle air/fuel ratio is thereby adjusted to the stoichiometric air/fuel ratio, the LPG-engine fuel control apparatus including:range-setting means to be operated to set an adjustment range of the control variable to multistage adjustment ranges each having a different width including the target value; and output control means for controlling an output pattern of the monitoring output means in each of the adjustment ranges set by the range-setting means, according to whether or not the control variable falls within the adjustment range.