Engine friction characterization
AssigneeDaimlerChrysler AG
InventorsBrian E. Beechie, Gregory L. Ohl, James W. Yip, Michael J. Prucka
Life of this patent
Estimating the term…
Abstract
A method for characterizing the friction losses within an internal combustion engine includes determining a start-up friction term, a mechanical friction term, a pumping loss term, and an adapted friction term to compensate for long-term frictional changes in the engine. A total engine frictional loss is determined by summing the start-up friction term, the mechanical friction term, the pumping loss term and the adapted friction term.
Claims13
A method for characterizing the friction losses within an internal combustion engine comprising the steps of:
- determining a start-up friction term;
- determining a mechanical friction term;
- determining a pumping loss term;
- determining an adapted friction term to compensate for long-term frictional changes in the engine;
- and
- determining a total engine frictional loss by summing said start-up friction term, said mechanical friction term, said pumping loss term and said adapted friction term.
An engine friction characterization for a motor vehicle comprising:
- a control module;
- a start-up friction module for determining a start-up friction term, said start-up friction module in communication with said control module;
- a mechanical friction module for determining a mechanical friction term, said mechanical friction module in communication with said control module;
- a pumping loss module for determining a pumping loss term, said pumping loss module in communication with said control module;
- an adaptation module for determining an adaptation term, said adaptation module in communication with said control module, said control module summing said start-up friction term, said mechanical friction term, said pumping loss term and said adaptation term to direct a vehicle control system.
A method for characterizing the friction losses within an internal combustion engine comprising the steps of:
- determining a mechanical friction term;
- determining a pumping loss term;
- and
- determining a total engine frictional loss by summing said mechanical friction term and said pumping loss term.
Dependencies are inferred from the claim text.