Method and system for estimating in-cylinder pressure and knocking utilizing an in-cylinder pressure sensor

A system for estimating in-cylinder parameters in an engine cylinder, comprising;

• an in-cylinder pressure sensor associated with an engine cylinder for sensing an ionization charge inside said engine cylinder and outputting an image charge signal indicative of a change rate of said engine cylinder pressure;
• a signal conditioning unit in communication with said in-cylinder pressure sensor including a pair of charge amplifier and a differential amplifier for detecting and amplifying said image charge signal;
• a data acquisition component for estimating at least one in-cylinder parameter and creating a control signal in accordance with a program stored in a memory as a control logic in order to control said engine cylinder performance;
• and
• a metallic sensor probe with a selective coating associated with said in-cylinder pressure sensor in order to function within a harsh, corrosive and elevated temperature environment.

A method for estimating in-cylinder parameters in an engine cylinder, comprising;

• associating an in-cylinder pressure sensor with an engine cylinder for sensing an ionization charge within said engine cylinder and outputting an image charge signal indicative of a change rate of said engine cylinder pressure;
• configuring a signal conditioning unit in communication with said in-cylinder pressure sensor including a pair of charge amplifier and a differential amplifier for detecting and amplifying said image charge signal;
• and
• providing a data acquisition component for estimating at least one in-cylinder parameter and creating a control signal in accordance with a program stored in a memory as control logic in order to control said engine cylinder performance.