Strategy for selectively bypassing a DPF in a hybrid HCCI combustion engine
First Claim
1. A method of operating a compression ignition engine comprising:
- processing certain data to select between an alternate diesel combustion mode and a conventional diesel combustion mode, and a) when the result of the processing selects the conventional diesel combustion mode, fueling one or more cylinders of the engine to cause conventional diesel combustion in each such cylinder, and causing the resulting exhaust gas to be treated by a diesel particulate filter (DPF) in an exhaust system of the engine before exiting the exhaust system, and b) when the result of the processing selects the alternative diesel combustion mode, fueling one or more cylinders of the engine to create in each such cylinder an in-cylinder fuel-air charge that ignites by auto-ignition as the charge is increasingly compressed, and causing the resulting exhaust gas to bypass the DPF as the exhaust gas passes through the exhaust system.
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Accused Products
Abstract
In a conventional diesel combustion mode, one or more cylinders (12) of an engine (10) is or are fueled to cause conventional diesel combustion in each such cylinder. The resulting exhaust gas is treated by a diesel particulate filter (36) in an exhaust system (34) before exiting the exhaust system. In an alternative diesel combustion mode, such as HCCI, one or more cylinders of the engine are fueled to create in each such cylinder an in-cylinder fuel-air charge that ignites by auto-ignition as the charge is increasingly compressed. Also a bypass valve (38) is opened so that the resulting exhaust gas bypasses the DPF as the exhaust gas passes through the exhaust system.
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Citations
15 Claims
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1. A method of operating a compression ignition engine comprising:
processing certain data to select between an alternate diesel combustion mode and a conventional diesel combustion mode, and a) when the result of the processing selects the conventional diesel combustion mode, fueling one or more cylinders of the engine to cause conventional diesel combustion in each such cylinder, and causing the resulting exhaust gas to be treated by a diesel particulate filter (DPF) in an exhaust system of the engine before exiting the exhaust system, and b) when the result of the processing selects the alternative diesel combustion mode, fueling one or more cylinders of the engine to create in each such cylinder an in-cylinder fuel-air charge that ignites by auto-ignition as the charge is increasingly compressed, and causing the resulting exhaust gas to bypass the DPF as the exhaust gas passes through the exhaust system. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A compression ignition engine comprising:
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a control system for processing data;
one or more combustion chambers;
a fueling system for injecting fuel into the one or more combustion chambers; and
an exhaust system comprising a diesel particulate filter (DPF) and a bypass in parallel flow relationship to the DPF;
wherein the control system controls the fueling system and the exhaust system using a result of the processing of certain data by the control system to select between an alternate diesel combustion mode and a conventional diesel combustion mode, and a) when the result of the processing selects the conventional diesel combustion mode, the control system causes the fueling system to fuel one or more cylinders of the engine for causing conventional diesel combustion in each such cylinder, and causes the resulting exhaust gas to flow through the DPF and not the bypass before exiting the exhaust system, and b) when the result of the processing selects the alternative diesel combustion mode, the control system causes the fueling system to fuel one or more cylinders to create in each such cylinder an in-cylinder fuel-air charge that ignites by auto-ignition as the charge is increasingly compressed, and causes the resulting exhaust gas to flow through the bypass and not the DPF as the exhaust gas passes through the exhaust system. - View Dependent Claims (9, 10, 11, 12)
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13. A compression ignition engine comprising:
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a control system for processing data;
one or more combustion chambers;
a fueling system for injecting fuel into the one or more combustion chambers; and
an exhaust system comprising a diesel particulate filter (DPF), bypass in parallel flow relationship to the DPF, and a control valve for selectively controlling flow through the DPF and the bypass;
wherein the control system controls the fueling system and the exhaust system using a result of the processing of certain data by the control system to select between an alternate diesel combustion mode and a conventional diesel combustion mode, and a) when the result of the processing selects the conventional diesel combustion mode, the control system causes the fueling system to fuel one or more cylinders of the engine for causing conventional diesel combustion in each such cylinder, and causes the control valve to allow exhaust gas to flow through the DPF, and b) when the result of the processing selects the alternative diesel combustion mode, the control system causes the fueling system to fuel one or more cylinders to create in each such cylinder an in-cylinder fuel-air charge that ignites by auto-ignition as the charge is increasingly compressed, and causes the control valve to allow exhaust gas to flow through the bypass. - View Dependent Claims (14, 15)
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Specification