Emission reduction in a diesel engine using an alternative combustion process and a low-pressure EGR loop
AssigneeInternational Engine Intellectual Property Company, LLC
InventorsZhengbai Liu, Puning Wei
Life of this patent
Estimating the term…
Abstract
A compression ignition engine (20) has a control system (26) for processing data, one or more combustion chambers (22), and fuel injectors (24) for injecting fuel into the combustion chambers. The control system controls fueling using a result of the processing of certain data, such as engine speed and engine load.
Claims18
A method of operating a turbocharged compression ignition engine during an engine cycle, the method comprising:
- creating in an engine cylinder before TDC, a charge comprising recirculated engine exhaust gas obtained from an exhaust system of the engine downstream of a turbine of a turbocharger of the engine, charge air, and fuel;
- compressing the charge to auto-ignition at or near TDC;
- and
- after TDC and before combustion of the auto-ignited charge has concluded, introducing additional fuel into the cylinder to continue combustion.
A turbocharged compression ignition engine comprising:
- engine cylinders within which combustion occurs to run the engine;
- an intake system through which charge air is introduced into the cylinders;
- an exhaust system through which products of combustion from the engine cylinders are exhausted;
- a turbocharger having a turbine in the exhaust system and a compressor in the intake system;
- a fueling system for fueling the cylinders;
- an exhaust gas recirculation circuit for conveying exhaust gas from a location in the exhaust system downstream of the turbine to a location in the intake system upstream of the compressor;
- and
- a processor-based engine control system for controlling the engine, including the fueling system, to create in the engine cylinders during engine cycles before TDC, charges comprising recirculated engine exhaust gas from the exhaust gas recirculation circuit, charge air drawn into the intake system by the compressor, and fuel that are compressed to auto-ignition at or near TDC, and after TDC before combustion of the auto-ignited charges has concluded, to cause additional fuel to be introduced into the cylinders to continue combustion.
A system for tailpipe emission control in a turbocharged compression ignition engine, the system comprising:
- a charge-formation capability for creating in the engine cylinders during engine cycles before TDC, charges comprising recirculated engine exhaust gas provided by a low-pressure exhaust gas recirculation loop that is associated with the engine between atmosphere and a turbocharger that turbocharges the engine, charge air drawn into the engine by the turbocharger, and fuel that is injected into the cylinders;
- an auto-ignition capability for causing auto-ignition of the charges at or near TDC;
- and
- a post-TDC extension-of-combustion capability that after TDC but before combustion of the auto-ignited charges has concluded, causes additional fuel to be introduced into the cylinders to extend combustion.
Dependencies are inferred from the claim text.