Throttle valve control apparatus

A throttle valve control apparatus comprising:

• a deviation calculating unit which calculates a deviation between a target opening and an actual opening of a throttle valve;
• a reference unit which outputs a control coefficient for the individual deviation;
• a temporarily determining unit which refers to the reference unit at a predetermined interval so as to temporarily determine a temporary control coefficient corresponding to the deviation;
• and
• a drive signal determining unit which determines a drive signal for the throttle valve based on the temporary control coefficient obtained from the temporarily determining unit and the deviation obtained from the deviation calculating unit,
• the apparatus further comprising:
• a time function generating unit which outputs as a function of an elapsed time starting from a moment when the deviation exceeds a predetermined deviation threshold, upper and lower limits of the control coefficient for the individual elapsed time;
• an upper/lower limit determining unit which has a function of starting measuring the elapsed time when the deviation exceeds the predetermined deviation threshold, and refers to the time function generating unit at a predetermined interval to determine the upper and lower limits of the control coefficient corresponding to the elapsed time;
• and
• a coefficient limiting unit which applies the upper and lower limits obtained from the upper/lower limit determining unit to the temporary control coefficient temporarily determined by the temporarily determining unit at predetermined periods, thereby determining the actual control coefficient for a present period,
• wherein the drive signal determining unit determines the drive signal for the throttle valve based on the actual control coefficient obtained from the coefficient limiting unit and the deviation obtained from the deviation calculating unit.

A throttle valve control apparatus comprising:

• a deviation calculating unit which calculates a deviation between a target opening and an actual opening of a throttle valve;
• a reference unit which outputs a control coefficient for the individual deviation;
• a temporarily determining unit which refers to the reference unit at a predetermined interval so as to temporarily determine a temporary control coefficient corresponding to the deviation;
• and
• a drive signal determining unit which determines a drive signal for the throttle valve based on the temporary control coefficient obtained from the temporarily determining unit and the deviation obtained from the deviation calculating unit,
• the apparatus further comprising:
• a stroke number function generating unit which outputs as a stroke number function of a number of strokes in the engine corresponding to the integral of the number of revolutions in the engine, upper and lower limits of the control coefficient for the individual stroke number;
• an upper/lower limit determining unit which has a function of starting measuring the number of strokes in the engine corresponding to the integral of the number of revolutions in the engine when the deviation exceeds a predetermined deviation threshold, and refers to the stroke number function generating unit at a predetermined interval to determine the upper and lower limits of the control coefficient corresponding to the number of strokes in the engine;
• and
• a coefficient limiting unit which applies the upper and lower limits obtained from the upper/lower limit determining unit to the temporary control coefficient temporarily determined by the temporarily determining unit at predetermined periods, thereby determining the actual control coefficient for a present period,
• wherein the drive signal determining unit determines the drive signal for the throttle valve based on the actual control coefficient obtained from the coefficient limiting unit and the deviation obtained from the deviation calculating unit.