Flexible engine cooling and exhaust gas temperature controls for diesel after-treatment regeneration and engine performance improvement
First Claim
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1. An internal combustion engine comprising:
- an intake system for creating charge air in an intake manifold;
combustion chambers in which charge air from the intake manifold and fuel are combusted;
an exhaust system for conveying exhaust gas from the combustion chambers through an exhaust gas treatment device that at times requires regeneration by elevation of exhaust gas temperature;
a charge air cooler comprising an airflow path for charge air upstream of the intake manifold and a liquid flow path for liquid engine coolant in heat exchange relationship with the airflow path;
a flow control system for controlling engine coolant flow through the liquid flow path of the charge air cooler; and
a control system comprising an executable strategy for conjunctive control of the flow control system and of the exhaust system to initiate regeneration of the exhaust gas treatment device.
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Abstract
System, methods, and strategies for regulating charge air temperature in an intake manifold of an internal combustion engine (50) by controlling the flow rate and temperature of liquid engine coolant flowing through a liquid flow path of a charge air cooler (72) that is in heat exchange relationship with charge air entering the intake manifold over a range that provides for the charge air to be selectively heated and cooled by liquid engine coolant. The invention provides flexible control that is useful in controlling exhaust gas temperature for regeneration and/or efficiency restoration of exhaust after-treatment devices (66) as well as improved engine performance.
59 Citations
36 Claims
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1. An internal combustion engine comprising:
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an intake system for creating charge air in an intake manifold;
combustion chambers in which charge air from the intake manifold and fuel are combusted;
an exhaust system for conveying exhaust gas from the combustion chambers through an exhaust gas treatment device that at times requires regeneration by elevation of exhaust gas temperature;
a charge air cooler comprising an airflow path for charge air upstream of the intake manifold and a liquid flow path for liquid engine coolant in heat exchange relationship with the airflow path;
a flow control system for controlling engine coolant flow through the liquid flow path of the charge air cooler; and
a control system comprising an executable strategy for conjunctive control of the flow control system and of the exhaust system to initiate regeneration of the exhaust gas treatment device. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. An internal combustion engine comprising:
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an intake system for creating charge air in an intake manifold;
combustion chambers in which charge air from the intake manifold and fuel are combusted;
a charge air cooler comprising a liquid flow path for liquid engine coolant to flow in heat exchange relationship with charge air flow through the charge air cooler; and
an engine coolant temperature and flow control system for controlling temperature and flow of engine coolant through the liquid flow path of the charge air cooler for selectively heating and cooling the charge air flowing through the charge air cooler. - View Dependent Claims (17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29)
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30. A method for controlling temperature of exhaust gas flow through an exhaust system of an internal combustion engine comprising an intake system for creating charge air and delivering the charge air to engine combustion chambers, a charge air cooler disposed in heat exchange relation with the charge air comprising a liquid flow path for liquid engine coolant to flow through the charge air cooler, a control system for controlling the exhaust system and engine coolant flow through the charge air cooler, the method comprising:
operating the control system to conjunctively control the exhaust system and coolant flow through the liquid flow path of the charge air cooler. - View Dependent Claims (31, 32, 33)
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34. A method for regulating charge air temperature in an intake manifold of an internal combustion engine comprising:
controlling the temperature of liquid engine coolant flowing through a liquid flow path of a charge air cooler that is in heat exchange relationship with charge air entering the intake manifold over a range that provides for the charge air to be selectively heated and cooled by liquid engine coolant. - View Dependent Claims (35, 36)
Specification