Electromagnetic valve control unit and internal combustion engine control device using same

An internal combustion engine control system comprising:

• a first controller that controls the internal combustion engine;
• and
• a second controller that controls an electromagnetic valve and that includes a high-pass extraction filter, and that is configured to control opening and closing of the electromagnetic valve using a drive current, wherein the second controller is also configured to:
• perform second-order differentiation of time series data of the drive current,
• correct the drive current that is applied to the electromagnetic valve, based on a detection time of an inflection point from the second-order differentiation of time series data of the drive current when the electromagnetic valve is open or closed,
• correct the drive current applied to the electromagnetic valve based on a time when a correlation of the time series data of the drive current and a reference pattern having a same frequency characteristic as the high-pass extraction filter in which both a total sum of filter coefficients and the moment of the filter coefficients are 0 become an extreme value,
• detect a valve closing completion time of the electromagnetic valve based on the detection time of the inflection point from the time series data of a drive voltage, or detect a valve opening start time or a valve opening completion time of the electromagnetic valve based on the detection time of the inflection point from the time series data of the drive current, and corrects the drive voltage or the drive current that is applied to the electromagnetic valve,
• control the drive voltage or the drive current applied to the electromagnetic valve based on a valve opening start deviation of the valve opening start time and a preset reference valve opening start time of the electromagnetic valve and a valve closing completion deviation of the valve closing completion time and a preset reference valve closing completion time of the electromagnetic valve,
• wherein the electromagnetic valve is an electromagnetic fuel injection valve that is configured to inject fuel of a target fuel injection amount into a combustion chamber of an internal combustion engine, and
• wherein the first controller is configured to correct the drive voltage or the drive current applied to the fuel injection valve based the valve opening start deviation, the valve closing completion deviation, and a reference injection pulse width obtained from the target fuel injection amount of the fuel injection valve and a reference characteristic map of the fuel injection valve.

An internal combustion engine control system comprising:

• a first controller that controls the internal combustion engine;
• and
• a second controller that controls an electromagnetic valve and that includes a high-pass extraction filter, and that is configured to control opening and closing of the electromagnetic valve using a drive voltage or drive current, wherein the second controller is also configured to:
• control opening and closing of the electromagnetic valve using a drive current,
• perform second-order differentiation of time series data of the drive current,
• correct the drive current that is applied to the electromagnetic valve based on a detection time of an inflection point from the second-order differentiation of time series data of the drive current when the electromagnetic valve is open or closed,
• correct the drive current applied to the electromagnetic valve based on a time when a correlation of the time series data of the drive current and a reference pattern having a same frequency characteristic as the high-pass extraction filter in which both a total sum of filter coefficients and the moment of the filter coefficients are 0 become an extreme value,
• detect the valve closing completion time of the electromagnetic valve based on the detection time of the inflection point from the time series data of the drive voltage, detect the valve opening start time of the electromagnetic valve based on the detection time of the inflection point from the time series data of the drive current, and correct the drive voltage or the drive current applied to the electromagnetic valve based on a time width from the valve opening start time to the valve closing completion time,
• control the drive voltage or the drive current applied to the electromagnetic valve based on a valve opening start deviation obtained by multiplying a valve opening completion deviation of the valve opening completion time and a preset reference valve opening completion time of the electromagnetic valve by a predetermined value and a valve closing completion deviation of the valve closing completion time and a preset reference valve closing completion time of the electromagnetic valve,
• wherein the electromagnetic valve is an electromagnetic fuel injection valve that is configured to inject fuel of a target fuel injection amount into a combustion chamber of an internal combustion engine, and
• the first controller is configured to correct the drive voltage or the drive current applied to the fuel injection valve based on the valve opening start deviation, the valve closing completion deviation, and a reference injection pulse width obtained from the target fuel injection amount of the fuel injection valve and a reference characteristic map of the fuel injection valve.