Air to air heat exchanger internal bypass

An induction system for providing a pressurized air charge to an internal combustion engine, comprising:

• means for pressurizing said pressurized air charge,
• means for receiving said pressurized air charge,
• temperature reduction means positioned downstream from and in communication with said receiving means for reducing the temperature of said pressurized air charge, and
• means for conveying said pressurized air charge from said temperature reduction means positioned downstream from said temperature reduction means,
• said temperature reduction means comprising a plurality of passages for reducing the thermal energy of said pressurized air charge, and
• control means to reduce selectively the number of said plurality of passages receiving said pressurized air charge and for increasing the flow rate of said air charge through said plurality of passages to reduce the rate of said thermal energy being transported away from said pressurized air charge by causing the temperature of said pressurized air charge arriving at the internal combustion engine to be increased while simultaneously reducing the pressure of said pressurized air charge arriving at the internal combustion engine, said control means being positioned, when operating, to reduce or eliminate pressurized air flow through substantially more than one half of said plurality of passages.

An induction system for providing a pressurized air charge to an internal combustion engine, comprising:

• means for pressurizing said pressurized air charge,
• means for receiving said pressurized air charge,
• heat exchanging means positioned downstream from and in communication with said receiving means for reducing the temperature of said pressurized air charge,
• means for conveying said pressurized air charge from said heat exchanging means positioned downstream from said heat exchanging means,
• said heat exchanging means comprising a plurality of passages defining a sealed fluid flow of said pressurized air charge within said heat exchanger means for reducing the thermal energy of said pressurized air charge, and
• control means to reduce selectively the number of said plurality of passages receiving said pressurized air charge and for increasing the flow rate of said air charge through said plurality of passages to reduce the rate of said thermal energy being transported away from said pressurized air charge by causing the temperature of said pressurized air charge arriving at the internal combustion engine to be increased while simultaneously reducing the pressure of said pressurized air charge arriving at the internal combustion engine, said control means being positioned, when operating, to reduce or eliminate pressurized air flow through substantially more than one half of said plurality of passages.

An induction system for providing a pressurized air charge to an internal combustion engine, comprising:

• means for pressurizing said pressurized air charge,
• means for receiving said pressurized air charge,
• heat exchanging means positioned downstream from and in communication with said receiving means for reducing the temperature of said pressurized air charge, and
• means for conveying said pressurized air charge from said heat exchanging means positioned downstream from said heat exchanging means;
• said heat exchanging means comprising a plurality of passages defining a sealed fluid flow of said pressurized air charge within said heat exchanger means for reducing the thermal energy of said pressurized air charge, and
• control means to vary the number of said plurality of passages receiving said pressurized air charge and for varying the flow rate of said air charge through said plurality of passages only in response to substantially subfreezing ambient air temperatures;
• said control means comprising a valve means to selectively vary the number of said plurality of passages receiving said pressurized air charge to regulate the reduction of said thermal energy of said pressurized air charge whereby the temperature of said pressurized air charge arriving at said internal combustion engine is increased and the pressure of said pressurized air charge arriving at the internal combustion engine is decreased.

A method for providing an increased air charge temperature and a reduced air charge pressure to an internal combustion engine;

• said internal combustion engine having means to pressurize said air charge and temperature reduction means positioned to reduce the temperature of said pressurized air charge received by said internal combustion engine;
• said temperature reducing means having a plurality of passages for reducing the thermal energy of said pressurized air charge flowing therethrough;
• said method including the steps of pressurizing said air charge,
• directing said air charge to said temperature reduction means, and
• varying the number of said plurality of passages for reducing said thermal energy of said pressurized air charge to increase the air charge temperature and reduce the air charge pressure in response to substantially subfreezing ambient air temperatures.