Method and system for scheduling optimal compression ratio of an internal combustion engine

An article of manufacture for operating an internal combustion engine coupled to a driveline of a motor vehicle, the internal combustion engine being operable in a plurality of compression ratio operating modes via a variable compression ratio apparatus, the article of manufacture comprising:

• a computer usable medium;
• and
• a computer readable program code embodied in the computer usable medium for directing a computer to control the steps of determining a driveline surge based at least in part on operating parameters of the motor vehicle,
• determining a driveline surge tolerance based at least in part on one or more of the vehicle operating parameters, selecting one of the compression ratio operating modes based at least in part on a comparison of the driveline surge to the driveline surge tolerance, and operating the variable compression apparatus to configure the internal combustion engine in the selected one of the compression ratio operating modes.

A method of operating an internal combustion engine coupled to a driveline of a motor vehicle, the internal combustion engine being operable in a plurality of compression ratio operating modes, the method comprising:

• determining a driveline surge based at least in part on operating parameters of the motor vehicle;
• determining a driveline surge tolerance based at least in part on one or more of the vehicle operating parameters;
• and
• selecting one of the compression ratio operating modes based at least in part on a comparison of the driveline surge to the driveline surge tolerance.

A method of operating a variable compression ratio internal combustion engine coupled to a driveline of a motor vehicle, the internal combustion engine being operable in at least a high compression ratio mode and a low compression ratio mode, the method comprising:

• determining a brake engine torque;
• determining a baseline engine surge based at least in part on the brake engine torque;
• determining a driveline surge based at least in part on the baseline engine surge;
• determining a driveline surge tolerance based at least in part on one or more operating parameters of the motor vehicle;
• and
• scheduling operation of the internal combustion engine in one of the compression ratio operating modes based at least in part of a comparison of the driveline surge to the driveline surge tolerance.