Split temperature regulating system and method for turbo charged internal combustion engine

A heat regulating system for an internal combustion engine having a turbo charger means for providing compressed air to the engine, coolant for transferring heat from the engine, radiator means for exchanging heat with the coolant which flows through the radiator means, fan means for forcing air into contact with the radiator means, coolant tank means for collecting the coolant flowing from the engine and a charged air cooler means for exchanging heat between the coolant and the compressed air from the turbo charger means, the system comprising:

• first valve means for regulating a first flow of the coolant between the engine and the radiator means;
• a subcooler radiator means in fluid communication with the radiator means for cooling at least a portion of the first flow of coolant exiting from the radiator means;
• second valve means for regulating a second flow of coolant between the engine and the air cooler means, the second flow bypassing the radiator means;
• and
• control system means including,
• means for actuating the second valve means in response to the temperature of the coolant at a predetermined location along the heat regulating system,
• means for actuating the first valve in response to the temperature of the coolant at the predetermined location along the heat regulating system, and
• means for regulating the speed of the fan in response to the temperature of the coolant at the predetermined location along the heat regulating system.

A method for regulating the temperature of a turbo charged internal combustion engine and compressed air provided to the engine by a turbo charger means with a system having coolant for transferring heat from the engine, radiator means in fluid communication with the engine for exchanging heat with the coolant which flows through the radiator means, fan means for forcing air into contact with the radiator means, and a charged air cooler means for exchanging heat between the coolant and the compressed air from the turbo charger means, the method comprising:

• flowing the coolant through the engine;
• distributing the flow of coolant exiting the engine among at least one of a plurality of flow paths, the flow paths including a first flow path from the engine through the radiator means and a second flow path between the engine and the air cooler means, the second flow path bypassing the radiator, the distributing including,
• regulating a first flow of coolant from the engine along the first flow path, the regulating including actuating a first valve means,
• cooling a portion of the flow of coolant exiting the radiator means, the cooling including passing the portion through a subcooler means, the subcooler means being in fluid communication with the radiator means, and
• regulating a second flow of coolant along the second flow path, the regulating including actuating a second valve means, and
• providing a control signal to actuate the second valve means in response to the temperature of the coolant at a predetermined location along the heat regulating system.