EXHAUST GAS RECIRCULATION IN A HOMOGENEOUS CHARGE COMPRESSION IGNITION ENGINE
First Claim
1. A method of operating an engine, comprising the steps of:
- mixing high and low pressure exhaust from upstream and downstream, respectively, of a turbocharger via a venturi connection;
supplying a mixture of exhaust and fresh air to a combustion chamber of the engine;
injecting liquid fuel into the combustion chamber prior to an auto-ignition condition of the fuel;
mixing the fuel with the exhaust/air mixture in the combustion chamber;
compressing the fuel/air/exhaust mixture through an auto-ignition condition of the fuel;
increasing a proportion of exhaust gas supplied to the combustion chamber by throttling a fresh air supply passage.
3 Assignments
0 Petitions
Accused Products
Abstract
A homogeneous charge compression ignition engine operates by injecting liquid fuel directly in a combustion chamber, and mixing the fuel with recirculated exhaust and fresh air through an auto ignition condition of the fuel. The engine includes at least one turbocharger for extracting energy from the engine exhaust and using that energy to boost intake pressure of recirculated exhaust gas and fresh air. Elevated proportions of exhaust gas recirculated to the engine are attained by throttling the fresh air inlet supply. These elevated exhaust gas recirculation rates allow the HCCI engine to be operated at higher speeds and loads rendering the HCCI engine a more viable alternative to a conventional diesel engine.
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Citations
19 Claims
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1. A method of operating an engine, comprising the steps of:
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mixing high and low pressure exhaust from upstream and downstream, respectively, of a turbocharger via a venturi connection; supplying a mixture of exhaust and fresh air to a combustion chamber of the engine; injecting liquid fuel into the combustion chamber prior to an auto-ignition condition of the fuel; mixing the fuel with the exhaust/air mixture in the combustion chamber; compressing the fuel/air/exhaust mixture through an auto-ignition condition of the fuel; increasing a proportion of exhaust gas supplied to the combustion chamber by throttling a fresh air supply passage. - View Dependent Claims (3, 4, 5, 6, 7, 8)
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2. (canceled)
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9-12. -12. (canceled)
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13. An engine comprising:
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an engine housing having at least one combustion chamber disposed therein; a fuel injector positioned for direct injection of liquid fuel into each combustion chamber; an exhaust passage extending between the engine housing and a turbocharger; a high pressure exhaust gas recirculation passage connected to the exhaust passage; at least one outlet from the turbocharger with a first branch connected to a low pressure exhaust gas recirculation passage, and a second branch connected to a tail pipe; a fresh air supply passage connected to the low pressure exhaust gas recirculation passage; a venturi connection fluidly connecting the low pressure exhaust gas recirculation passage with the high pressure exhaust gas recirculation passage; a throttle control valve positioned in the fresh air supply passage; and an engine controller configured to inject fuel prior to an auto-ignition of the fuel and then to compress a mixture of fuel with air and exhaust gas in the combustion chamber to the auto-ignition condition of the fuel, and configured increase a proportion of exhaust gas supplied to the combustion chamber by actuating the throttle control valve. - View Dependent Claims (14, 15, 16, 18, 19)
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17. (canceled)
Specification