System and method for operating an internal combustion engine with pressure measurements or pressure estimates based on a plausibility check

A system, comprising:

• a controller, configured to:
• collect a knocking signal of a knocking sensor;
• collect a cylinder pressure signal of a cylinder pressure sensor measuring a cylinder pressure prevailing in a combustion chamber of the internal combustion engine;
• determine an estimated cylinder pressure in the combustion chamber on the basis of a model and the knocking signal;
• subject the cylinder pressure signal to a plausibility check to classify the cylinder pressure signal as either plausible or non-plausible;
• and
• control the at least one control variable of the internal combustion engine based on a target operational parameter and at least partially based on the plausibility check, wherein the control comprises operations to:
• control the internal combustion engine using the cylinder pressure signal in response to the plausibility check classifying the cylinder pressure signal as plausible;
• and
• control the internal combustion engine using the estimated cylinder pressure in response to the plausibility check classifying the cylinder pressure signal as non-plausible, further comprising at least one of:
• the target operational parameter comprises a desired drive power, an energy requirement, an emission, or any combination thereof;
• or
• the least one control variable comprises an ignition time point, a boost pressure, a supplied quantity of fuel, a supplied quantity of charge air, an exhaust gas recirculation rate, or any combination thereof.

A system, comprising:

• a combustion chamber of an internal combustion engine;
• a knocking sensor configured to collect a knocking signal;
• a cylinder pressure sensor configured to collect a cylinder pressure signal measuring a cylinder pressure prevailing in the combustion chamber of the internal combustion engine;
• a controller configured to:
• determine an estimated cylinder pressure in the combustion chamber on the basis of a model and the knocking signal;
• subject the cylinder pressure signal to a plausibility check to classify the cylinder pressure signal as either plausible or non-plausible;
• and
• control at least one control variable of the internal combustion engine based on a target operational parameter and at least partially based on the plausibility check, wherein the control comprises operations to:
• control the internal combustion engine using the cylinder pressure signal in response to the plausibility check classifying the cylinder pressure signal as plausible;
• and
• control the internal combustion engine using the estimated cylinder pressure in response to the plausibility check classifying the cylinder pressure signal as non-plausible, further comprising at least one of:
• the target operational parameter comprises a desired drive power, an energy requirement, an emission, or any combination thereof;
• or
• the least one control variable comprises an ignition time point, a boost pressure, a supplied quantity of fuel, a supplied quantity of charge air, an exhaust gas recirculation rate, or any combination thereof.