Patent
Methods and Systems for Variable Displacement Engine Control
TLDR
In this paper, the position of one or more valves and throttles may be adjusted based on the selective deactivation to reduce back-flow through the disabled cylinders while also maintaining conditions of a downstream exhaust catalyst.Abstract:
Methods and systems are provided for selecting a group of cylinders for selective deactivation, in a variable displacement engine system, based at least on a regeneration state of an exhaust catalyst. The position of one or more valves and throttles may be adjusted based on the selective deactivation to reduce back-flow through the disabled cylinders while also maintaining conditions of a downstream exhaust catalyst. Pre-ignition and knock detection windows and thresholds may also be adjusted based on the deactivation to improve the efficiency of knock and pre-ignition detection.read more
Citations
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Patent
Method and system for pre-ignition control
TL;DR: In this paper, a pre-ignition mitigation method is proposed based on a feed-forward likelihood of preignition and feedback from a pre -ignition event, where a cylinder may be enriched while an engine load is limited to restore exhaust catalyst feed-gas oxygen levels.
Patent
System and method for controlling a firing sequence of an engine to reduce vibration when cylinders of the engine are deactivated
TL;DR: In this paper, a spectral density module and a firing sequence module are used to determine the spectral density of an engine's cylinders and determine whether each cylinder of the engine is active or deactivated.
Patent
Cylinder activation and deactivation control systems and methods
TL;DR: In this paper, a ranking module determines N ranking values for N predetermined cylinder activation/deactivation sequences of an engine, respectively, and a cylinder control module, based on the ranking values, selects one of the N predetermined cylinders activation and deactivation sequences as a desired cylinder activation or deactivation sequence for cylinders of the engine.
Patent
Multi-level skip fire
TL;DR: In this paper, a method for controlling operation of an internal combustion engine is described, where the engine is operated in a skip fire manner such that selected skipped working cycles are skipped and selected active working cycle are fired to deliver a desired engine output.
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Look-up table based skip fire engine control
TL;DR: A variety of skip fire engine controllers and control methods are described that utilize look-up tables, state machines, or other data structures to determine the sequence or ordering of skip-fire firings as mentioned in this paper.
References
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Patent
Exhaust gas purification system for an internal combustion engine
TL;DR: In this paper, a dual passage exhaust gas purification system for an internal combustion engine includes a first passage and a second passage which are connected in parallel to each other, and a flow switching valve is provided so as to switch the flow of exhaust gas between the first and second passage.
Patent
Supercharged internal combustion engine
Jean Melchior,Thierry Andre +1 more
TL;DR: In this paper, a four-stroke internal combustion engine comprising N groups of two or three cylinders the exhaust phases of which do not interfere with one another, the exhaust ports (6) of which are linked together by an individual exhaust manifold (3) which communicates with a common inlet manifold (2) and is linked to one of the N inlets (19) of a shutter (14) the single outlet of which is connected to the inlet of a turbine (5), common to the N groups and which is controlled in such a way as to open an exclusive
Patent
Engine control system and method
TL;DR: In this article, the rate of combustion is determined by a linear equation based upon data arrived from combustion chamber pressures, which is adapted to operate under different control modes so as to provide specific control for normal running, lean burn, maximum torque, cold starting, transient conditions, and/or knock control.
Patent
Engine system and method accounting for engine misfire
TL;DR: In this paper, various systems and methods for carrying out combustion in a fuel cut operation in some or all of the engine cylinders of a vehicle were discussed, such as fuel vapor purging, air-fuel ratio control, engine torque control, catalyst design, and exhaust system design.
Patent
Engine cylinder deactivation to improve the performance of exhaust emission control systems
TL;DR: In this paper, a controller and cylinder deactivation system is proposed to regenerate an exhaust aftertreatment device for a multicylinder engine that operates primarily at an air/fuel ratio that is lean of stoichiometry.