Temperature control for turbocharged engine

A cooling system for an internal combustion engine providing enchanced cooling of engine lube oil, the system comprising:

• a radiator receiving engine coolant from an engine for cooling the engine coolant;
• a subcooler receiving engine coolant from the radiator and being exposed to a flow of ambient air, with the ambient air first flowing past the subcooler and then on to the radiator, with the subcooler further cooling the engine coolant received from the radiator;
• and
• a lube oil cooler receiving the engine coolant from the subcooler for enchanced cooling of the engine lube oil.

An apparatus for conditioning a flow of combustion air being supplied to the intake of a turbocharged internal combustion engine, the apparatus comprising:

• a control element for selecting between ambient air and heated ambient air as a source of combustion air intake to a turbocharger;
• an air-to-water intercooler receiving compressed combustion air from the turbocharger;
• and
• valving for selectively supplying coolant to the air-to-water intercooler at a temperature higher than that of the compressed combustion air passing through the air-to-water intercooler to heat the compressed combustion air in a heating mode, and supplying coolant to the air-to-water intercooler at a temperature lower than the compressed combustion air passing through the air-to-water intercooler to cool the compressed combustion air in a cooling mode.

An apparatus for conditioning a flow of combustion air being supplied to the intake of an internal combustion engine, the apparatus comprising:

• an air-to-liquid heat exchanger disposed in the flow of combustion air for heat exchange between the combustion air and a liquid coolant;
• and
• an air-to-air heat exchanger disposed in the flow of combustion air downstream of the air-to-liquid heat exchanger for heat exchange between the combustion air and ambient air, and further comprising:
• a coolant circuit for delivering liquid coolant to the air-to-liquid heat exchanger;
• and
• wherein the coolant circuit comprises a control element for selecting the liquid coolant delivered to the air-to-liquid heat exchanger to be of a predetermined temperature relationship to that of the combustion air entering the air-to-liquid intercooler.

An apparatus for conditioning a flow of combustion air being supplied to the intake of an internal combustion engine, the apparatus comprising:

• an air-to-liquid heat exchanger disposed in the flow of combustion air for heat exchange between the combustion air and a liquid coolant;
• and
• an air-to-air heat exchanger disposed in the flow of combustion air downstream of the air-to-liquid heat exchanger for heat exchange between the combustion air and ambient air, further comprising:
• a motor powered fan for moving ambient air through the air-to-air heat exchanger;
• and
• a flow path for supplying ambient air to the motor to ventilate the motor along a path other than through the air-to-air heat exchanger.

A cooling system for an internal combustion engine, the cooling system comprising:

• a liquid coolant circuit comprising an air-to-liquid intercooler for providing heat exchange between a liquid coolant and a flow of combustion air being supplied to an intake of an internal combustion engine;
• and
• an air-to-air intercooler disposed within the flow of combustion air downstream of the air-to-liquid intercooler for providing heat exchange between the flow of combustion air and ambient air;
• wherein the liquid coolant circuit further comprises at least one valve for controlling the liquid coolant delivered to the air-to-liquid intercooler to have a predetermined temperature relationship with the combustion air entering the air-to-liquid intercooler.

A cooling system for an internal combustion engine, the cooling system comprising:

• a liquid coolant circuit comprising an air-to-liquid intercooler for providing heat exchange between a liquid coolant and a flow of combustion air being supplied to an intake of an internal combustion engine;
• and
• an air-to-air intercooler disposed within the flow of combustion air downstream of the air-to-liquid intercooler for providing heat exchange between the flow of combustion air and ambient air;
• further comprising:
• a fan motor disposed downstream of the air-to-air intercooler for driving a fan for forcing a flow of ambient air through the air-to-air intercooler;
• and
• a duct for supplying a flow of ambient air to ventilate the fan motor along a flow path other than that through the air-to-air intercooler.

A cooling system for an internal combustion engine, the cooling system comprising:

• a liquid coolant circuit comprising an air-to-liquid intercooler for providing heat exchange between a liquid coolant and a flow of combustion air being supplied to an intake of an internal combustion engine;
• and
• an air-to-air intercooler disposed within the flow of combustion air downstream of the air-to-liquid intercooler for providing heat exchange between the flow of combustion air and ambient air;
• wherein the liquid coolant circuit further comprises:
• a radiator for receiving coolant heated by the engine;
• a subcooler for receiving coolant from the radiator;
• and
• a lubricant cooler for receiving coolant from the subcooler and for providing heat exchange between the coolant and engine lubricant.

A cooling system for an internal combustion engine, the cooling system comprising:

• a liquid coolant circuit comprising an air-to-liquid intercooler for providing heat exchange between a liquid coolant and a flow of combustion air being supplied to an intake of an internal combustion engine;
• and
• an air-to-air intercooler disposed within the flow of combustion air downstream of the air-to-liquid intercooler for providing heat exchange between the flow of combustion air and ambient air;
• wherein the liquid coolant circuit further comprises an interconnection between the air-to-liquid intercooler and an engine cooling device for providing a supply of coolant from the engine cooling device to the air-to-liquid intercooler;
• and
• wherein the liquid coolant circuit further comprises a lubricant cooler for providing heat exchange between the coolant and an engine lubricant, the lubricant cooler connected between the engine cooling device and the air-to-liquid intercooler.

A method of conditioning the combustion air being supplied to an internal combustion engine, the method comprising:

• directing compressed combustion air from a turbocharger to an air-to-liquid heat exchanger for heat exchange with a liquid coolant of an engine cooling system;
• and
• directing the compressed combustion air from the air-to-liquid heat exchanger to an air-to-air heat exchanger for heat exchange with ambient air;
• further comprising providing at least one valve in the engine cooling system for controlling a temperature of the liquid coolant provided to the air-to-liquid heat exchanger to have a predetermined temperature relationship with the combustion air entering the air-to-liquid intercooler.

A method of conditioning the combustion air being supplied to an internal combustion engine, the method comprising:

• directing compressed combustion air from a turbocharger to an air-to-liquid heat exchanger for heat exchange with a liquid coolant of an engine cooling system;
• and
• directing the compressed combustion air from the air-to-liquid heat exchanger to an air-to-air heat exchanger for heat exchange with ambient air;
• further comprising controlling the heat exchange between the combustion air and the ambient air by one of controlling the speed of a fan forcing ambient air through the air-to-air heat exchanger and controlling a position of a shutter disposed within a flow stream of the ambient air.

A method of conditioning the combustion air being supplied to an internal combustion engine, the method comprising:

• directing compressed combustion air from a turbocharger to an air-to-liquid liquid heat exchanger for heat exchange with a liquid coolant of an engine cooling system;
• and
• directing the compressed combustion air from the air-to-liquid heat exchanger to an air-to-air heat exchanger for heat exchange with ambient air;
• further comprising:
• forcing ambient air through the air-to-air heat exchanger with a suction fan driven by a suction fan motor;
• and
• providing cooling air to ventilate the suction fan motor along a flow path other than that through the air-to-air heat exchanger.

A method of conditioning the combustion air being supplied to an internal combustion engine, the method comprising:

• directing compressed combustion air from a turbocharger to an air-to-liquid heat exchanger for heat exchange with a liquid coolant of an engine cooling system;
• and
• directing the compressed combustion air from the air-to-liquid heat exchanger to an air-to-air heat exchanger for heat exchange with ambient air;
• forming the engine cooling system to include an engine water jacket;
• and
• directing coolant from the engine water jacket to the air-to-liquid heat exchanger;
• further comprising the directing coolant from the engine water jacket to the air-to-liquid heat exchanger through an engine lubricant cooler.

A method of conditioning the combustion air being supplied to an internal combustion engine, the method comprising:

• directing compressed combustion air from a turbocharger to an air-to-liquid heat exchanger for heat exchange with a liquid coolant of an engine cooling system;
• and
• directing the compressed combustion air from the air-to-liquid heat exchanger to an air-to-air heat exchanger for heat exchange with ambient air;
• forming the engine cooling system to include an engine water jacket;
• and
• directing coolant from the engine water jacket to the air-to-liquid heat exchanger;
• further comprising directing coolant from the engine water jacket to an engine lubricant cooler in parallel to the coolant being directed from the engine water jacket to the air-to-liquid heat exchanger.

A method of conditioning the combustion air being supplied to an internal combustion engine, the method comprising:

• directing compressed combustion air from a turbocharger to an air-to-liquid heat exchanger for heat exchange with a liquid coolant of an engine cooling system;
• and
• directing the compressed combustion air from the air-to-liquid heat exchanger to an air-to-air heat exchanger for heat exchange with ambient air;
• further comprising directing liquid coolant to the air-to-liquid heat exchanger through an engine lubricant cooler.

An internal combustion engine comprising:

• an intake manifold for receiving combustion air into an engine;
• a coolant loop for circulating coolant for heat exchange between the engine and ambient air;
• an air-to-liquid intercooler having a combustion air side forming a first portion of a flow path of the combustion air to the intake manifold and having a liquid side forming a portion of the coolant loop for heat exchange between the combustion air and the coolant;
• and
• an air-to-air intercooler having a combustion air side forming a second portion of the flow path of the combustion air disposed downstream of the first portion and having an ambient air side for heat exchange between the combustion air and ambient air;
• further comprising a bypass for selectively directing the combustion air around the air-to-air intercooler.

An internal combustion engine comprising:

• an intake manifold for receiving combustion air into an engine;
• a coolant loop for circulating coolant for heat exchange between the engine and ambient air;
• an air-to-liquid intercooler having a combustion air side forming a first portion of a flow path of the combustion air to the intake manifold and having a liquid side forming a portion of the coolant loop for heat exchange between the combustion air and the coolant;
• and
• an air-to-air intercooler having a combustion air side forming a second portion of the flow path of the combustion air disposed downstream of the first portion and having an ambient air side for heat exchange between the combustion air and ambient air;
• further comprising:
• a motor powered fan for delivery of ambient air to the air-to-air intercooler;
• and
• a duct for delivering air to ventilate the motor along a flow path other than that through the air-to-air intercooler.

An internal combustion engine comprising:

• an intake manifold for receiving combustion air into an engine;
• a coolant loop for circulating coolant for heat exchange between the engine and ambient air;
• an air-to-liquid intercooler having a combustion air side forming a first portion of a flow path of the combustion air to the intake manifold and having a liquid side forming a portion of the coolant loop for heat exchange between the combustion air and the coolant;
• and
• an air-to-air intercooler having a combustion air side forming a second portion of the flow path of the combustion air disposed downstream of the first portion and having an ambient air side for heat exchange between the combustion air and ambient air;
• further comprising:
• radiator and a subcooler having respective coolant sides forming a portion of the coolant loop and connected in series relationship, and having respective ambient air sides, a flow of ambient air passing respectively past the subcooler ambient air side and the radiator ambient air side;
• and
• a lubricant cooler having a coolant side forming a portion of the coolant loop disposed downstream of the subcooler coolant side and having an engine lubricant side.