An ECU outputs an ignition signal and a discharge waveform control signal. An ignition device closes an ignition switching element in a period during which the ignition signal is input. After a stop of the input of the ignition signal and in a period of input of the discharge waveform control signal
An ECU outputs an ignition signal and a discharge waveform control signal. An ignition device closes an ignition switching element in a period during which the ignition signal is input. After a stop of the input of the ignition signal and in a period of input of the discharge waveform control signal, the ignition device controls current flowing through a primary coil to a discharge current command value that is determined by the discharge waveform control signal by opening or closing a control switching element. A discharge control unit determines whether there is an abnormality. When it is determined that there is an abnormality, the ECU avoids control executed by the discharge control unit, and causes the discharge control unit to execute control during times of low-rotation and low-load operation of an internal combustion engine in order to determine whether the discharge control unit has returned to a normal state.
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1. A control apparatus for an internal combustion engine, the control apparatus comprising: an ignition device including a spark plug, an ignition coil, a discharge control circuit and a discharge control unit, the spark plug being provided in a combustion chamber of the internal combustion engine,
1. A control apparatus for an internal combustion engine, the control apparatus comprising: an ignition device including a spark plug, an ignition coil, a discharge control circuit and a discharge control unit, the spark plug being provided in a combustion chamber of the internal combustion engine, the ignition coil being connected to the spark plug, the discharge control circuit being configured to retain discharge current after a start of discharging of the spark plug, and the discharge control unit being configured to control the discharge current by operating the discharge control circuit; andan electronic control unit configured to (i) control a controlled amount of the internal combustion engine by operating the ignition device,(ii) determine whether there is an abnormality in at least one of the discharge control unit and the discharge control circuit,(iii) when the electronic control unit determines that there is the abnormality in at least one of the discharge control unit and the discharge control circuit, avoid control over the discharge current by the discharge control unit, and(iv) after the electronic control unit determines that there is the abnormality in at least one of the discharge control unit and the discharge control circuit, cancel avoidance of control over the discharge current, and determine whether the at least one of the discharge control unit and the discharge control circuit has returned from the abnormality by causing the discharge control unit to execute control for bringing the discharge current to a discharge current smaller than or equal to a minimum value during times when the electronic control unit does not determine that there is the abnormality. 2. The control apparatus according to claim 1, wherein the electronic control unit is configured to (i) when the discharge control unit is not caused to control the discharge current after a start of discharging of the spark plug, adjust air-fuel mixture in the combustion chamber to a low ignition state where ignitability of the air-fuel mixture is lower than or equal to a predetermined ignitability,(ii) when the air-fuel mixture has been adjusted to the low ignition state, cause the discharge control unit to control the discharge current,(iii) when the electronic control unit determines that there is the abnormality in at least one of the discharge control unit and the discharge control circuit, stop adjusting the air-fuel mixture to the low ignition state, and, when the discharge control unit is not caused to control the discharge current after the start of discharging of the spark plug, adjust the air-fuel mixture in the combustion chamber to a high ignition state where ignitability of the air-fuel mixture exceeds the predetermined ignitability, and(iv) cancel avoidance of control over the discharge current during times when the air-fuel mixture is placed in the high ignition state, and cause the discharge control unit to control the discharge current. 3. The control apparatus according to claim 2, wherein the electronic control unit is configured to (i) control an air-fuel ratio of air-fuel mixture in the combustion chamber to a value larger than or equal to a predetermined air-fuel ratio leaner than a stoichiometric air-fuel ratio, and(ii) control the air-fuel ratio of air-fuel mixture in the combustion chamber to a value smaller than the predetermined air-fuel ratio. 4. The control apparatus according to claim 1, wherein the electronic control unit is configured to, on a condition that a rotation speed of the internal combustion engine is lower than or equal to a predetermined speed, cancel avoidance of control over the discharge current, and cause the discharge control unit to control the discharge current. 5. The control apparatus according to claim 1, wherein the electronic control unit is configured to, on a condition that a load of the internal combustion engine is smaller than or equal to a predetermined value, cancel avoidance of control over the discharge current, and cause the discharge control unit to control the discharge current. 6. The control apparatus according to claim 1, wherein the electronic control unit is configured to, when a detected value of discharge current in a period during which the discharge control unit is caused to control the discharge current is smaller than or equal to a threshold, determine that there is the abnormality. 7. The control apparatus according to claim 1, wherein the ignition device includes an ignition switching element and a control switching element, the ignition switching element is configured to open or close a first loop circuit including a first power supply and a primary coil of the ignition coil, and the control switching element is configured to open or close a second loop circuit including a second power supply and the primary coil,the discharge control circuit includes the control switching element, andthe discharge control unit is configured to (i) discharge the spark plug by using electromotive force that is generated in a secondary coil of the ignition coil as a result of switching of the ignition switching element from a closed state to an open state,(ii) after discharging of the spark plug, control the discharge current of the spark plug by opening or closing the control switching element, and (iii) a polarity of voltage that is applied by the first power supply to the primary coil during times when the first loop circuit is a closed loop and a polarity of voltage that is applied by the second power supply to the primary coil during times when the second loop circuit is the closed loop are reverse from each other.
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