Fuel injection control device

Abstract

The present application aims to provide a fuel injection control device capable of improving the execution frequency and accuracy of individual difference detection of a plurality of fuel injection valves. To this end, the fuel injection control device (127) measures, for each of a plurality of fuel injection valves (105), a time from the end of energization of a solenoid (407) to the movement of a valve body (402) to the closed valve position as a closed valve time, divides the energization time of the solenoid (407) into a plurality of intervals (1001 to 1004), calculates, in each of the plurality of intervals (1001 to 1004), an average value of the closed valve time measured a plurality of times as an average closed valve time, calculates an inherent closed valve time based on the average closed valve time of at least one of the plurality of intervals (1001 to 1004), and corrects the energization time according to the inherent closed valve time of each of the plurality of fuel injection valves (105).

Claims

1. A fuel injection control device for controlling a plurality of fuel injection valves whose valve bodies are moved from a closed position to an open position by energizing a solenoid, characterized in that, For each of the plurality of fuel injection valves, the time from the termination of energization of the solenoid to the valve body moving to the closed position is measured as the valve closing time. The energizing time of the solenoid is divided into multiple intervals. In each of these intervals, the average value of the valve closing time measured multiple times is calculated as the average valve closing time. The inherent valve closing time is calculated based on the average valve closing time of at least one of the plurality of intervals. The energizing time is corrected based on the inherent closing time of each of the plurality of fuel injection valves. The inherent valve closing time is calculated based on the average valve closing time of the intervals in which the deviation of the valve closing time is below a specified value.

2. A fuel injection control device for controlling a plurality of fuel injection valves whose valve bodies are moved from a closed position to an open position by energizing a solenoid, characterized in that, For each of the plurality of fuel injection valves, the time from the termination of energization of the solenoid to the valve body moving to the closed position is measured as the valve closing time. The energizing time of the solenoid is divided into multiple intervals. In each of these intervals, the average value of the valve closing time measured multiple times is calculated as the average valve closing time. The inherent valve closing time is calculated based on the average valve closing time of at least one of the plurality of intervals. The energizing time is corrected based on the inherent closing time of each of the plurality of fuel injection valves. The average valve closing time in the interval with the smallest deviation of the valve closing time among the multiple intervals is calculated as the inherent valve closing time.

3. A fuel injection control device for controlling a plurality of fuel injection valves whose valve bodies are moved from a closed position to an open position by energizing a solenoid, characterized in that, For each of the plurality of fuel injection valves, the time from the termination of energization of the solenoid to the valve body moving to the closed position is measured as the valve closing time. The energizing time of the solenoid is divided into multiple intervals. In each of these intervals, the average value of the valve closing time measured multiple times is calculated as the average valve closing time. The inherent valve closing time is calculated based on the average valve closing time of at least one of the plurality of intervals. The energizing time is corrected based on the inherent closing time of each of the plurality of fuel injection valves. For each of the plurality of intervals, the pre-calculated average valve closing time is stored as a reference average valve closing time. The inherent valve closing time is calculated based on the average valve closing time of the intervals in which the change in the average valve closing time relative to the reference average valve closing time is within a specified range.

4. The fuel injection control device as described in claim 3, characterized in that, The specified range is changed according to the number of times the plurality of fuel injection valves are actuated.

5. The fuel injection control device as described in any one of claims 1 to 3, characterized in that, The inherent valve closing time is calculated for each fuel pressure.

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