Method for monitoring operational parameters in an internal combustion engine

A method to monitor and store information about an operating characteristic in a combustion engine, comprising the steps:

• a) creating a monitoring matrix divided into several sections for storage of information on a data storage medium, wherein each section is associated with specific intervals of values for reference engine characteristics of the combustion engine, wherein the reference engine characteristics comprise engine speed ω and torque requested from the engine T1;
• b) using the engine during an operational time window of a predetermined duration, detecting the reference engine characteristics during the time window, and estimating or measuring an operating characteristic on several occasions, and associating each estimated or measured value for the operating characteristic with the monitoring matrix's respective section, associated with values of the reference engine characteristics at the respective occasions;
• c) for each section in the monitoring matrix, calculating at least one statistical parameter describing the estimated or measured values of the operating characteristic associated with this section during the current operational time window, and storing the at least one calculated statistical parameter in the respective section;
• and
• d) at the end of the operational time window, storing information, which had been stored in the monitoring matrix, in an individual storage matrix associated with the operational time window, and emptying the monitoring matrix of information.