A method of controlling an internal combustion engine
An engine, engine load technology, applied in the direction of internal combustion piston engine, combustion engine, engine components, etc., can solve problems such as reducing combustion stability
Active Publication Date: 2019-09-13
GM GLOBAL TECH OPERATIONS LLC
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Problems solved by technology
A known engine control strategy to manage NOx emissions involves operating with increased dilution of cylinders with recirculated exhaust, with a corresponding risk of reduced combustion stability
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[0010] Referring now to the accompanying drawings, the description is only for the purpose of illustrating certain exemplary embodiments, not for limiting the present invention. figure 1 An internal combustion engine (engine) 100 is schematically shown, which includes an engine controller 26 and an exhaust gas aftertreatment system 50 arranged according to an embodiment of the present invention. The engine 100 is a multi-cylinder spark-ignition direct injection (SIDI) internal combustion engine, which preferably adopts an open combustion chamber geometry including a high-squish bowl-in-pistonpiston, and in one embodiment Including stratified combustion charging operation. The engine control system controls fuel injection through rapid pulses from the fuel injector 47. Multiple injection events in a given engine cycle require a large amount of fuel to be output to mix with air before the ignition event, and there is a short injection event after the ignition event to accurately ...
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A fuel injection strategy and spark timing are selected for a spark ignition direct fuel injected engine responsive to monitored engine loads associated with multiple load regions. This includes selecting a preferred spark timing based on engine load, and selecting a first fuel injection event that performs post-ignition, where the first fuel injection event is delivered at a predetermined timing relative to the preferred timing for a spark ignition event Set fuel quality independent of engine load. A first pre-ignition fuel injection event is selected and includes a second fuel mass injected at a second fuel injection timing, wherein the end-of-injection timing of the first pre-ignition fuel injection event is in relation to the preferred ignition timing The predetermined timing of , regardless of engine load, and wherein the second fuel mass is determined relative to engine load.
Description
Technical field [0001] The present invention relates to internal combustion engines and methods and devices for their control. Background technique [0002] Engine downsizing includes reducing engine displacement and the number of engine cylinders to reduce weight, friction and pumping losses, while increasing engine operation in high-speed, high-load operating areas to maintain engine performance based on power and efficiency. Known small engines use intake compressors to improve air flow, which affects engine knock and exhaust emissions. One known engine control strategy to reduce knocking involves retarding combustion phasing by controlling spark ignition timing, with a corresponding decrease in engine efficiency. One known engine control strategy for managing NOx emissions involves operating with increased dilution of cylinders and recirculated exhaust gas, which brings a corresponding risk of reduced combustion stability. Summary of the invention [0003] A spark ignition d...
Claims
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IPC IPC(8): F02D41/38F02D41/40F02P5/04F02P5/145F02D43/00
CPCF02D41/008F02D41/38F02D41/401F02D2041/389F02D2200/10F02D2200/101F02D2250/24F02P5/045F02P5/145F01N3/021F01N3/2066F02D37/02F02D41/2409F02D41/3023F02D41/402F02D41/405Y02T10/12Y02T10/40
Inventor A·S·所罗门R·M·奥托
Owner GM GLOBAL TECH OPERATIONS LLC