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US 7,017,561 B1Granted
Control strategy for expanding diesel HCCI combustion range by lowering intake manifold temperature
AssigneeInternational Engine Intellectual Property Company, LLC
InventorsZhengbai Liu, Puning Wei
Life of this patent
Estimating the term…
Abstract
An engine (10) utilizes “regular EGR cooling” when operating in HCCI mode at loads within a low load range (56, 58, 60) and “enhanced EGR cooling” that allows the engine to continue to operate in HCCI mode when engine load increases beyond loads in the low load range (64, 66, 68). When engine load increases further to a point where it enters a high load range, the combustion mode changes over to conventional diesel combustion, and exhaust gas recirculation reverts to “regular EGR cooling” (70, 72, 74).
Claims15
A method of operating a compression ignition engine comprising:
- processing data indicative of engine load,
- when a result of processing data indicative of engine load discloses engine load in a low load range, fueling the engine to operate by alternative diesel combustion and passing recirculated exhaust gas through a first EGR cooler, but not a second EGR cooler,
- when a result of processing data indicative of engine load discloses engine load in a medium load range comprising loads greater than those of the low load range, fueling the engine to operate by alternative diesel combustion and passing recirculated exhaust gas through both the first EGR cooler and the second EGR cooler, and
- when a result of processing data indicative of engine load discloses engine load in a high load range comprising loads greater than those of the medium load range, fueling the engine to operate by conventional diesel combustion and passing recirculated exhaust gas through the first EGR cooler, but not the second EGR cooler.
1 more element
A compression ignition engine comprising:
- a control system for processing data;
- one or more combustion chambers;
- an intake system for conveying charge air to the one or more combustion chambers;
- a fueling system for injecting fuel into the one or more combustion chambers;
- an exhaust system for conveying exhaust gases from the one or more combustion chambers;
- an exhaust gas recirculation (EGR) system for recirculating some of the exhaust gases to the intake system;
- wherein the control system processes data indicative of engine load, and when a result of processing data indicative of engine load discloses engine load in a low load range, the control system causes the fueling system to fuel the engine for operation by alternative diesel combustion and causes the EGR system to pass recirculated exhaust gas through a first EGR cooler, but not a second EGR cooler,
- when a result of processing data indicative of engine load discloses engine load in a medium load range comprising loads greater than those of the low load range, the control system causes the fueling system to fuel the engine for operation by alternative diesel combustion and causes the EGR system to pass recirculated exhaust gases through both the first EGR cooler and the second EGR cooler, and
- when a result of processing data indicative of engine load discloses engine load in a high load range comprising loads greater than those of the medium load range, the control system causes the fueling system to fuel the engine for operation by conventional diesel combustion and causes the EGR system to pass recirculated exhaust gases through the first EGR cooler, but not the second EGR cooler.
6 more elements
A compression ignition engine comprising:
- a control system for processing data;
- one or more combustion chambers;
- an intake system for conveying charge air to the one or more combustion chambers;
- a fueling system for injecting fuel into the one or more combustion chambers;
- an exhaust system for conveying exhaust gases from the one or more combustion chambers;
- an exhaust gas recirculation (EGR) system for recirculating some of the exhaust gases to the intake system comprising a first EGR cooler through which flow of recirculated exhaust gases can be selectively restricted and a second EGR cooler through which flow of recirculated exhaust gases can be selectively restricted;
- wherein the control system processes data indicative of engine load, and when a result of processing data indicative of engine load discloses engine load in a first load range, the control system causes the fueling system to fuel the engine for operation by alternative diesel combustion and causes the EGR system to prohibit flow of exhaust gases through one of the EGR coolers while selectively restricting flow of exhaust gases through the other EGR cooler,
- when a result of processing data indicative of engine load discloses engine load in a second load range comprising loads greater than those of the first load range, the control system causes the fueling system to fuel the engine for operation by alternative diesel combustion and causes the EGR system to selectively restrict flow of exhaust gases through both EGR coolers.
5 more elements
Dependencies are inferred from the claim text.