| 主权项 |
1. An in-vehicle engine control apparatus for sequentially driving a fuel injection electromagnetic valve provided for each cylinder of a multi-cylinder engine, comprising:
a drive control circuit portion including a plurality of switch elements for alternately and sequentially driving a plurality of electromagnetic coils for driving the electromagnetic valves to be opened, for each of a first cylinder group and a second cylinder group, a boosting control circuit portion which generates a boosted high voltage for rapidly exciting the electromagnetic coils, and an operation control circuit portion mainly composed of a microprocessor and a program memory, wherein the boosting control circuit portion includes one or more induction elements intermittently excited by one or more boosting switch elements from an in-vehicle battery, and one or more high-voltage capacitors charged to a boosted high voltage as a target through multiple intermittent operations by electromagnetic energy accumulated in the induction elements being discharged when the boosting switch element is opened, the drive control circuit portion includes a power feeding-sustaining switch element connected individually or for each cylinder group through a backflow prevention element between the in-vehicle battery and the electromagnetic coils, a rapid excitation switch element connected individually or for each cylinder group between the high-voltage capacitor and the electromagnetic coils, a commutation circuit element connected individually or for each cylinder group in parallel with the electromagnetic coils, and a rapid cutoff switch element individually connected in series with the electromagnetic coil or the commutation circuit element, the operation control circuit portion further includes fuel injection command means which provides a fuel injection command to the plural switch elements, a control program forming split upper limit designating means which designates an upper limit value of a selected value for designating how many times the fuel injection command signal should be provided to the same electromagnetic coil during one combustion cycle period of each engine in the multi-cylinder engine, and a reference data which is a data table or an approximated calculation, the reference data is an aggregation of reference data respectively related to a plurality of elements to be monitored, in which the reference data includes the selected value limited by the split upper limit designating means as a mediate parameter, and is composed of minimum values edited of numerical data of allowable engine rotational speed determined by a detected environmental temperature, as a parameter, detected by an environmental temperature detection element and related to installation environments of the elements to be monitored, representing any of the induction element, the boosting switch element, the rapid excitation switch element, the power feeding-sustaining switch element, and the rapid cutoff switch element, the allowable engine rotation speed is statistic data obtained by experimentally confirming that the internal temperature of the elements to be monitored becomes equal to or less than a predetermined allowable limit temperature even in case of a continuous operation with multiple injections by applying the selected value designated to the measured environmental temperature, and the split upper limit designating means determines the selected value having a higher split injection frequency as an upper limit within an allowable range by comparing an engine rotational speed Ne detected by an engine rotation sensor and a value of the allowable engine rotational speed with respect to the measured environmental temperature at present calculated by an interpolation operation from the reference data. |
