A premixed charge compression ignition engine, and a control system, is provided which effectively initiates combustion by compression ignition and maintains stable combustion while achieving extremely low nitrous oxide emissions, good overall efficiency and acceptable combustion noise and cylinder pressures. The present engine and control system effectively controls the combustion history, that is, the time at which combustion occurs, the rate of combustion, the duration of combustion and/or the completeness of combustion, by controlling the operation of certain control variables providing temperature control, pressure control, control of the mixture's autoignition properties and equivalence ratio control. The combustion control system provides active feedback control of the combustion event and includes a sensor, e.g. pressure sensor, for detecting an engine operating condition indicative of the combustion history, e.g. the start of combustion, and generating an associated engine operating condition signal. A processor receives the signal and generates control signals based on the engine operating condition signal for controlling various engine components to control the temperature, pressure, equivalence ratio and/or autoignition properties so as to variably control the combustion history of future combustion events to achieve stable, low emission combustion in each cylinder and combustion balancing between the cylinders.

Premixed charge compression ignition engine with optimal combustion control

CFD modeling of the in-cylinder flow in direct-injection Diesel engines

The effects of swirl and tumble on combustion in spark-ignition engines

A number of embodiments of engine controls and engine control methods that employ instantaneous rate of combustion is the combustion chamber at a sensed parameter. Rate of combustion is determined by a linear equation based upon data arrived from combustion chamber pressures. The system 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. The desired rate of combustion is achieved by engine control adjustments.

Engine control system and method

Tumbling Motion: A Mechanism for Turbulence Enhancement in Spark-Ignition Engines

An Experimental and Computational Analysis of the Flow Field in a Four-Valve Spark Ignition Engine-Focus on Cycle-Resolved Turbulence

Three Dimensional Modelling of Flow and Turbulence In a Four-valve Spark Ignition Engine - Comparison with LDV Measurements

The control system of the invention is associated with an engine provided with means for measuring one or several parameters including pressures (in the cylinder, induction pressure, exhaust pressure) for each cylinder, acceleration, injection needle lift, knock detection, engine torque, etc., and with means for the angular coding of the crankshaft position. The control system includes a synchronization set (7) co-operating with angular discrimination means so as to readjust automatically at any time the angular coding data with respect to the combustion cycles. An acquisition set digitizes at a high frequency the various data measured, and notably the pressure values taken during each cycle, simultaneously in all the cylinders. A processing set (18) including notably a fast digital processor suited for determining in real time complex physical parameters such as the man indicated pressure (PMI) at each cycle or each engine revolution, stability factors of these parameters in time, etc. The results obtained are applied to a control computer (19) suited for determining and optimizing various engine parameters such as fuel injection, advanced ignition, etc.

Instantaneous data acquisition and processing system for internal-combustion engine control

The computational fluid dynamics codes, which help to predict the behaviour of combusting gas in reciprocating engines, need, as boundary conditions for the momentum and energy equations, to approximate wall frictions and heat transfer between gas and walls. The purpose of this work is to outline the physical parameters which affect the heat transfer in spark ignited engines, and then to validate a multidimensional model which takes these parameters into account

Measurements and Multidimensional Modeling of Gas-Wall Heat Transfer in a S.I. Engine

A fuel pump-injector unitary assembly comprises a plunger slidable in a bore and provided with a longitudinal passage-way, in combination with a metering ring surrounding the plunger and housed in an annular chamber of the injector body. The plunger is movable into a first or upper postion in which fuel is admitted into the lower part of the injector bore through an inlet port, and a second or lower position in which the tapered lower end of the plunger obturates fuel spray nozzles provided at the bottom of the bore. Fuel metering results from the cooperation of an inclined ramp of the ring with a fuel discharge duct transversely extending through the plunger and connected with the longitudinal passage-way thereof. Relative rotation of the metering ring and of the plunger permits adjustment of the injected fuel charge.

Philippe Pinchon

Papers

An Experimental and Computational Analysis of the Flow Field in a Four-Valve Spark Ignition Engine-Focus on Cycle-Resolved Turbulence

Three Dimensional Modelling of Flow and Turbulence In a Four-valve Spark Ignition Engine - Comparison with LDV Measurements

Instantaneous data acquisition and processing system for internal-combustion engine control

Measurements and Multidimensional Modeling of Gas-Wall Heat Transfer in a S.I. Engine

Fuel pump-injector unitary assembly for internal combustion engine