System and method for controlling a turbocharger to maximize performance of an internal combustion engine

A system for controlling a turbocharger supplying air to an internal combustion engine, the system comprising:

• a combustion manager operative to determine a desired air mass rate based upon a current operating point of the engine;
• an air system manager operative to determine an air mass rate error as a difference between the desired air mass rate and an actual air mass rate of the engine;
• and
• a turbo manager operative to control an operating state of the turbocharger so as to minimize the air mass rate error;
• wherein the turbo manager is further operative to prevent the turbocharger from maintaining a turbocharger temperature in excess of a predetermined limit;
• wherein the turbo manager is further operative not to reduce the wastegate bypass amount if the reduced wastegate bypass amount previously caused a turbocharger shaft speed in excess of a second predetermined amount.

A system for controlling a turbocharger supplying air to an internal combustion engine, the system comprising:

• a combustion manager operative to determine a desired air mass rate based upon a current operating point of the engine;
• an air system manager operative to determine an air mass rate error as a difference between the desired air mass rate and an actual air mass rate of the engine;
• and
• a turbo manager operative to control an operating state of the turbocharger so as to minimize the air mass rate error while preventing the turbocharger from maintaining a turbocharger shaft speed in excess of a first predetermined limit and while preventing the turbocharger from maintaining a turbocharger temperature in excess of a second predetermined limit;
• wherein the turbo manager is operative to increase a wastegate bypass amount of the turbocharger if the turbocharger shaft speed is in excess of the first predetermined limit;
• and
• wherein the turbo manager is further operative to derate a fueling command to the engine if the wastegate bypass is at a maximum and the turbocharger shaft speed is in excess of the first predetermined limit.

A method for controlling a turbocharger supplying air to an internal combustion engine, comprising the steps of:

• a) determining a current operating point of the engine;
• b) determining a desired air mass rate based upon the current operating point;
• c) determining an actual air mass rate of the engine;
• d) determining an air mass rate error as a difference between the desired air mass rate and the actual air mass rate;
• e) controlling an operating state of the turbocharger so as to minimize the air mass rate error;
• f) controlling the operating state of the turbocharger so as to prevent the turbocharger from maintaining a turbocharger temperature in excess of a predetermined limit;
• g) increasing a wastegate bypass amount of the turbocharger if the turbocharger shaft speed is in excess of the predetermined limit;
• and
• h) derating a fueling command to the engine if the wastegate bypass amount is at a maximum and the turbocharger shaft speed is in excess of the predetermined limit.

A method for controlling a turbocharger supplying air to an internal combustion engine, comprising the steps of:

• a) determining a current operating point of the engine;
• b) determining a desired air mass rate based upon the current operating point;
• c) determining an actual air mass rate of the engine;
• d) determining an air mass rate as a difference between the desired air mass rate and the actual air mass rate;
• e) controlling an operating state of the turbocharger so as to minimize the air mass rate error while preventing the turbocharger from maintaining a turbocharger shaft speed in excess of a first predetermined limit and while preventing the turbocharger from maintaining a turbocharger temperature in excess of a second predetermined limit;
• f) reducing a wastegate bypass amount of the turbocharger if the temperature is in excess of the second predetermined limit;
• and
• g) preventing reduction of the wastegate bypass amount if the reduced wastegate bypass amount previously caused a turbocharger shaft speed in excess of the first predetermined limit.