초록 ▼

A system includes an internal combustion engine, an EGR flow path having an EGR cooler path and an EGR cooler bypass path, a turbocharger, a compressed intake flow path, an EGR bypass valve that selectively divides the EGR flow between the EGR cooler path and the EGR cooler bypass path, a charge air

A system includes an internal combustion engine, an EGR flow path having an EGR cooler path and an EGR cooler bypass path, a turbocharger, a compressed intake flow path, an EGR bypass valve that selectively divides the EGR flow between the EGR cooler path and the EGR cooler bypass path, a charge air cooler bypass valve that reduces an amount of cooling of compressed intake air out of the compression side of the turbocharger, and an aftertreatment component that receives the exhaust stream from the turbine side of the turbocharger. The aftertreatment component requires at least intermittent exhaust stream temperature elevation. The system includes a controller that determines that an exhaust stream temperature elevation request is present, and provides a charge air cooler bypass valve command and an EGR bypass valve command in response to the exhaust stream temperature elevation request.

대표청구항 ▼

1. A system, comprising: an internal combustion engine receiving an intake stream from an intake manifold and delivering an exhaust stream having a temperature to an exhaust manifold;an EGR flow path fluidly coupling the exhaust manifold to the intake manifold, the EGR flow path including an EGR coo

1. A system, comprising: an internal combustion engine receiving an intake stream from an intake manifold and delivering an exhaust stream having a temperature to an exhaust manifold;an EGR flow path fluidly coupling the exhaust manifold to the intake manifold, the EGR flow path including an EGR cooler path and an EGR cooler bypass path;a turbocharger compressing intake air on a compression side and receiving work from the exhaust stream on a turbine side;a compressed intake flow path fluidly coupling the compression side of the turbocharger to the intake manifold;an EGR bypass valve structured to selectively divide the EGR flow between the EGR cooler path and the EGR cooler bypass path;a charge air cooler bypass valve structured to reduce an amount of cooling of compressed intake air out of the compression side of the turbocharger;an aftertreatment component receiving the exhaust stream from the turbine side of the turbocharger, the aftertreatment component requiring at least intermittent exhaust stream temperature elevation;a fuel-consuming temperature generation system, anda controller configured to increase the temperature of the exhaust stream from the internal combustion engine for thermal management of the aftertreatment component by controlling a charge air cooler bypass valve and an EGR bypass valve, wherein the controller is further configured to achieve the increase in the temperature of the exhaust stream by first utilizing the EGR bypass valve to direct all EGR flow through the EGR cooler bypass path and, in response to an intake manifold temperature limit of the intake manifold, switching to utilize the charge air cooler bypass valve to reduce cooling of compressed intake air to achieve the increase in the temperature of the exhaust stream while the EGR bypass valve is closed to direct all the EGR flow through the EGR cooler path and, in response to a required increase in the temperature of the exhaust stream not being met while the EGR bypass valve is closed and the compressed intake air bypasses the charge air cooler, operating the fuel-consuming temperature generation system to achieve the increase in the temperature of the exhaust stream. 2. The system of claim 1, wherein the EGR bypass valve command is a binary command having possible values of ON and OFF and wherein the charge air cooler bypass valve command is a modulated command. 3. The system of claim 1, wherein the controller is further configured to operate at least one of an EGR cooler in the EGR cooler path and a charge air cooler in the intake as a heater to increase the temperature of the exhaust stream. 4. The system of claim 1, further comprising a second turbocharger stage, wherein a charge air cooler in the intake cools compressed air from either turbocharger stage. 5. The system of claim 4, further comprising a second charge air cooler that cools the compressed air from the other turbocharger stage. 6. The system of claim 5, wherein the controller is further configured to provide a second charge air bypass valve command. 7. The system of claim 1, wherein the charge air cooler bypass valve reduces the amount of cooling by selectively modulating a coolant flow rate in a cooling jacket. 8. A method, comprising: determining that an exhaust stream temperature elevation for an exhaust stream produced by an engine for operation of an aftertreatment component in the exhaust stream is required;determining present engine operating conditions of the engine; andin response to the required exhaust stream temperature elevation and the present engine operating conditions, operating an EGR bypass valve, a charge air cooler bypass valve, and a fuel-consuming temperature generation system to increase an intake manifold temperature above a nominal intake manifold temperature, wherein the operating includes first utilizing the EGR bypass valve to direct EGR flow through an EGR cooler bypass path to increase the intake manifold temperature to cause an exhaust stream temperature elevation and, in response to an intake manifold temperature limit of an intake manifold of the engine, switching to utilizing the charge air cooler bypass valve to reduce cooling of compressed intake air to cause the exhaust stream temperature elevation while the EGR bypass valve is closed to direct all the EGR flow through an EGR cooler path and then, in response to the required exhaust stream temperature elevation not being met by the compressed intake air bypassing the charge air cooler while the EGR bypass valve is closed, operating the fuel-consuming temperature generation system to achieve the required exhaust stream temperature elevation. 9. The method of claim 8, further comprising determining that the exhaust stream temperature elevation is required in response to at least one parameter selected from the parameters consisting of: a low engine load condition; a cold ambient air condition; a cold engine operating temperature condition; an aftertreatment temperature request condition; and an aftertreatment regeneration request condition. 10. The method of claim 8, further comprising operating the EGR bypass valve as a binary valve having an ON and an OFF position and operating the charge air cooler bypass valve as a modulated valve. 11. The method of claim 8, further comprising operating at least one of the EGR cooler and the charge cooler as a heater to increase the intake manifold temperature. 12. An apparatus, comprising: an exhaust stream temperature module configured to determine that an exhaust stream temperature elevation of an exhaust stream produced by an engine is required for operation of an aftertreatment component is present;an engine conditions module configured to determine present engine operating conditions of the engine; anda bypass control module configured to, in response to the required exhaust stream temperature elevation, increase an intake manifold temperature above a nominal intake manifold temperature by first operating an EGR bypass valve to direct all EGR flow through an EGR cooler bypass path to increase the intake manifold temperature to cause an exhaust stream temperature elevation and, in response to an intake manifold temperature limit of the engine, switching to operate a charge air cooler bypass valve to reduce cooling of compressed intake air to cause the exhaust stream temperature elevation while the EGR bypass valve is closed to direct all the EGR flow through an EGR cooler path and, in response to the required exhaust stream temperature elevation not being met while the EGR bypass valve is closed and the charge air cooler is bypassed by the compressed intake air, operating a fuel-consuming temperature generation system to achieve the required exhaust stream temperature elevation. 13. The apparatus of claim 12, wherein the exhaust stream temperature module is further configured to determine that the exhaust stream temperature elevation is required in response to at least one parameter selected from the parameters consisting of: a low engine load condition; a cold ambient air condition; a cold engine operating temperature condition; an aftertreatment temperature request condition; and an aftertreatment regeneration request condition. 14. The apparatus of claim 12, wherein the bypass control module is further configured to operate the EGR bypass valve as a binary valve having an ON and an OFF position and to operate the charge air cooler bypass valve as a modulated valve. 15. The apparatus of claim 12, further comprising a cooler heating capability module configured to determine whether present system operating conditions indicate one of an EGR cooler heating capability and a charge cooler heating capability, wherein the bypass control module is further configured to operate at least one of the EGR cooler and the charge cooler as a heater to increase the intake manifold temperature in response to the one of the EGR cooler heating capability and the charge cooler heating capability. 16. The apparatus of claim 12, wherein the bypass control module is further configured to respond to a temperature feedback parameter, the temperature feedback parameter comprising one of the intake manifold temperature and the exhaust stream temperature. 17. A system, comprising: an internal combustion engine receiving an intake stream from an intake manifold and delivering an exhaust stream having a temperature to an exhaust manifold;an EGR flow path fluidly coupling the exhaust manifold to the intake manifold, the EGR flow path including an EGR cooler path and an EGR cooler bypass path;a turbocharger compressing intake air on a compression side and receiving work from the exhaust stream on a turbine side;a compressed intake flow path fluidly coupling the compression side of the turbocharger to the intake manifold;an EGR bypass valve structured to selectively divide the EGR flow between the EGR cooler path and the EGR cooler bypass path;a charge air cooler bypass valve structured to reduce an amount of cooling of compressed intake air out of the compression side of the turbocharger;an aftertreatment component receiving the exhaust stream from the turbine side of the turbocharger, the aftertreatment component requiring at least intermittent exhaust stream temperature elevation;a fuel consuming means for increasing the exhaust temperature, anda means for selectively operating the EGR bypass valve, the charge air cooler bypass valve, and the fuel consuming means in response to an exhaust stream temperature elevation requirement to increase the temperature of the exhaust stream from the internal combustion engine for operation of the aftertreatment component, wherein the means for selectively operating achieves the exhaust stream temperature elevation requirement by first utilizing the EGR bypass valve to direct all EGR flow through the EGR cooler bypass path and, in response to an intake manifold temperature limit of the intake manifold, switching to utilize the charge air cooler bypass valve to reduce cooling of compressed intake air to achieve the exhaust stream temperature elevation requirement while the EGR bypass valve is closed to direct all the EGR flow through the EGR cooler path, and in response to the exhaust stream temperature elevation requirement not being met by the compressed intake air bypassing the charge air cooler while the EGR bypass valve is closed, operating the fuel consuming means to meet the exhaust stream temperature elevation requirement. 18. The system of claim 17, further comprising a means for operating the EGR bypass valve in a binary manner and a means for operating the charge air cooler bypass valve in a modulated manner. 19. The system of claim 17, wherein the means for selectively operating further comprises a means for reducing a coolant flow to the charge air cooler.