Abnormality diagnosis device for in-cylinder pressure sensor

A method of diagnosing abnormality of an in-cylinder pressure sensor attached to an engine of an automobile to detect pressure inside a combustion chamber, comprising carrying out:

• a performance determination in which a performance quality of the in-cylinder pressure sensor is determined based on an electric signal inputted from the in-cylinder pressure sensor;
• a first determination in which the performance determination is performed at a given timing;
• a performance recovery in which a given deposit removal control is executed in which a deposit accumulating inside the combustion chamber is removed when the performance quality of the in-cylinder pressure sensor is determined to fall below a given reference value;
• and
• a second determination in which the performance determination is carried out again after the performance recovery,
• wherein in the second determination, the in-cylinder pressure sensor is diagnosed as abnormal when the performance quality of the in-cylinder pressure sensor is determined to fall below the given reference value, and
• wherein the performance determination is carried out when a supply of fuel to the engine is stopped.

An abnormality diagnosis device of an in-cylinder pressure sensor attached to an engine of an automobile to detect pressure inside a combustion chamber, comprising:

• a processor configured to execute a sensor diagnosing module to carry out a performance determination in which a performance quality of the in-cylinder pressure sensor is determined based on an electric signal inputted from the in-cylinder pressure sensor, the sensor diagnosing module carrying out:
• a first determination in which the performance determination is performed at a given timing;
• a performance recovery in which a given deposit removal control is executed in which a deposit accumulating inside the combustion chamber is removed when the performance quality of the in-cylinder pressure sensor is determined to fall below a given reference value;
• and
• a second determination in which the performance determination is carried out again after the performance recovery,
• wherein in the second determination, the in-cylinder pressure sensor is diagnosed as abnormal when the performance quality of the in-cylinder pressure sensor is determined to fall below the given reference value,
• wherein the engine includes:
• a spark plug configured to ignite a mixture gas inside the combustion chamber;
• an intake passage through which intake air is introduced into the combustion chamber;
• an exhaust passage through which exhaust gas generated in the combustion chamber is discharged;
• an exhaust gas recirculation (EGR) passage communicating the intake passage with the exhaust passage and configured to recirculate a portion of the exhaust gas to the intake passage;
• and
• an EGR valve configured to adjust an amount of the exhaust gas flowing inside the EGR passage, and
• wherein the deposit removal control includes igniting the mixture gas by the spark plug to cause combustion in a state where the EGR valve is controlled to reduce the amount of the exhaust gas introduced into the combustion chamber.

An abnormality diagnosis device of an in-cylinder pressure sensor attached to an engine of an automobile to detect pressure inside a combustion chamber, comprising:

• a processor configured to execute a sensor diagnosing module to carry out a performance determination in which a performance quality of the in-cylinder pressure sensor is determined based on an electric signal inputted from the in-cylinder pressure sensor, the sensor diagnosing module carrying out:
• a first determination in which the performance determination is performed at a given timing;
• a performance recovery in which a given deposit removal control is executed in which a deposit accumulating inside the combustion chamber is removed when the performance quality of the in-cylinder pressure sensor is determined to fall below a given reference value;
• and
• a second determination in which the performance determination is carried out again after the performance recovery,
• wherein in the second determination, the in-cylinder pressure sensor is diagnosed as abnormal when the performance quality of the in-cylinder pressure sensor is determined to fall below the given reference value,
• wherein the performance determination is carried out by estimating a pressure inside the combustion chamber at the given timing by way of a calculation, and comparing the estimated pressure with an output value of the in-cylinder pressure sensor at the given timing, and
• wherein the estimated pressure is corrected according to an engine speed.