Showing papers on "Carbureted compression ignition model engine published in 1999"

A numerical study of a free piston ic engine operating on homogeneous charge compression ignition combustion

Abstract: A free piston, internal combustion (IC) engine, operating at high compression ratio (~30:1) and low equivalence ratio (φ~0.35), and utilizing homogeneous charge compression ignition combustion, has been proposed by Sandia National Laboratories as a means of significantly improving the IC engine’s cycle thermal efficiency and exhaust emissions. A zero-dimensional, thermodynamic model with detailed chemical kinetics, and empirical scavenging, heat transfer, and friction component models has been used to analyze the steady-state operating characteristics of this engine. The cycle simulations using hydrogen as the fuel, have indicated the critical factors affecting the engine’s performance, and suggest the limits of improvement possible relative to conventional IC engine technologies.

Study of combustion characteristics of a compression ignition engine fuelled with dimethyl ether

Abstract: This paper presents the combustion characteristics of a light-duty direct-injection diesel engine operating on dimethyl ether (DME). The indicated pressure diagrams and injector needle lifts are recorded and the combustion characteristics are demonstrated and compared with those of an engine operated on diesel fuel. The experimental and calculated results show that the DME engine has a longer delay of injection and duration of injection, a lower maximum cylinder pressure and rate of pressure rise, as well as a shorter ignition delay compared with those of a diesel engine. The DME engine has a low mechanical load and combustion noise, a fast rate of diffusion combustion and a shorter combustion duration than that of a diesel engine. It has the ideal pattern of compression ignition engine heat release.

Sunflower methyl ester as a fuel for automobile diesel engines

Abstract: This article presents the results of an investigation carried out in an automobile diesel engine running on sunflower oil methyl ester (SME), pure and mixed with diesel fuel. Engine test bench studies have been carried out, with the aim of obtaining comparative measures of torque, power, specific fuel consumption, and emission of pollutants, to evaluate and compare the behavior of a diesel engine running on SME or SME with diesel fuel.

Control system and control method for diesel engine

Abstract: A control system for a compression ignition type diesel engine includes an operating state detecting unit for detecting the operating state of the diesel engine. A combustion mode selecting unit selects, in correspondence with the output of the operating state detecting unit, a first combustion mode, wherein fuel injection is carried out in the first half of the compression stroke, or a second combustion mode, wherein fuel injection is carried out at around compression top dead center. An effective compression ratio varying unit varies the effective compression ratio of the diesel engine and a control unit controls the effective compression ratio varying unit to lower the effective compression ratio when the first combustion mode is selected by the combustion mode selecting unit compared to when the second combustion mode is selected. When the first combustion mode is selected by the combustion mode selecting unit, by fuel injection being carried out in the first half of the compression stroke and the effective compression ratio being lowered so that compression ignition occurs at around compression top dead center, a uniform highly diffuse premix combustion can be realized. When the second combustion mode is selected by the combustion mode selecting unit, by fuel injection being carried out at compression top dead center and ignition occurring at around compression top dead center substantially simultaneously with fuel injection, without the effective compression ratio being lowered, diffusion combustion is realized.

Procedure for running IC engine driven not only by spark-ignited but also self-igniting fuel, especially petrol

Abstract: A procedure for running an IC engine driven not only by spark-ignited but also self-ignited fuel, especially petrol has spark ignition and self ignition regimes assigned to the engine running regime. At least in self ignition regimes, a suitable high compression ratio is made available for self ignition of the fuel. The combustion in self ignition regimes is induced by self ignition and in spark ignition regimes, by spark ignition of the air/fuel mixture. The part load range is assigned to the self ignition regime. The full load range and/or engine running range with high engine load plus the cold starting are assigned to the spark ignition regime. In the self ignition regime, a homogeneous fuel/air mixture, at least approximately, is generated in the combustion chamber. At least in the spark ignition regime, a stratified charge is generated in the combustion chamber.

Method for controlling compression ignition type internal combustion engine

Abstract: (57) [Summary] [PROBLEMS] To secure cost stability and improve fuel efficiency while ensuring stable combustion and good startability even at low load operation. Provided is a control method for a compression ignition type internal combustion engine that can be performed. SOLUTION: In the control method of the compression ignition type internal combustion engine 3, Depending on the operation state (step 2 in FIG. 2), it is possible to switch between compression ignition combustion in which a fuel-air mixture is burned by compression ignition and spark ignition combustion in which combustion is performed by spark ignition, When switching from the spark ignition combustion to the compression ignition combustion, the ignition timing θig of the spark ignition is gradually retarded (step 27 in FIG. 3) to control the switching to the compression ignition combustion.

Staged injection of an emulsified diesel fuel into a combustion chamber of a diesel engine

Abstract: A method of operating a diesel engine (10) which overcomes problems encountered during use of a low cetane fuel with long ignition delays is disclosed. The method provides for a staged injection of an emulsified diesel fuel into the combustion chamber (14) of the diesel engine (10). In particular, the method includes the steps of (A) injecting a pilot volume (38) of an emulsified diesel fuel into a combustion chamber (14) of the diesel engine (10), wherein the emulsified diesel fuel includes water and diesel fuel, (B) compressing the pilot volume (38) of the emulsified diesel fuel within the combustion chamber (14) during a compression stroke of the diesel engine (10), and (C) injecting a main volume (40) of the emulsified diesel fuel into the combustion chamber (14) of the diesel engine (10), whereby heat generated by compression of the pilot volume (38) of the emulsified diesel fuel causes the pilot volume (38) of the emulsified diesel fuel to combust so as to ignite the main volume (40) of the emulsified diesel fuel.

Liquefied petroleum gas fuel for compression ignition engine

Abstract: A clean liquefied petroleum gas fuel usable in compression ignition engines as a fuel substituting for diesel oil such as light and heavy oil. The fuel is supplied to the combustion chamber of a compression ignition engine with a compression ratio set in the range of from 11 to 23, and comprises a liquefied petroleum gas and a radical generating agent which is not less than 0.1 % by volume of the fuel.

Control device for diesel engine and power train device

Abstract: PROBLEM TO BE SOLVED: To provide the control device for a diesel engine in which the generation restraint of NOx and particulate is compatible, in a high load operation area SOLUTION: This control device A is provided with a fuel injection valve 5 for jetting the fuel directly in the cylinder 2 of a diesel engine 1 and an injection control means 35a for jetting dividingly the fuel of an injection amount set responding to the operation state of the diesel engine to a fuel injection valve while dividing in plural times Such control device of the diesel engine that the injection control means increases the number of times of a divided injection than a low load operation area at the high load operation area of the diesel engine is provided COPYRIGHT: (C)2001,JPO

Apparatus for controlling fuel injection quantity at the time of starting diesel engine and method

Abstract: An apparatus controlling a fuel injection quantity at the time of starting a Diesel engine and a method are disclosed. The apparatus and method detect a water temperature at the time of starting the Diesel engine, detect an engine speed at the time of starting the Diesel engine, set a starting fuel injection quantity based on the water temperature at the time of starting the Diesel engine and the engine speed at the time of starting the Diesel engine, detect a line pressure of an automatic transmission mounted to the Diesel engine, and correct the starting fuel injection quantity based on the line pressure of the automatic transmission.

Control device for cylinder fuel injection engine

Abstract: PROBLEM TO BE SOLVED: To stably control the change of an ignition timing in the condition of operating an engine with fuel injection in a compression stroke. SOLUTION: When an ignition timing is changed in the condition of operating an engine with fuel injection in a compression stroke, a fuel injection timing is changed in conjunction with an engine rotating speed and a fuel supply pressure.

Studies on exhaust emissions in semi-adiabatic compression ignition engine with alternate fuels

Abstract: Alcohols (ethanol and methanol) and a few non-edible vegetable oil s are showing a great potential fo r replaci ng conventional diesel fuels quite effecti vely. The low heat rejection semi-adi abatic compression igniti on (C. I. ) engines are gaining prominence fo r adopting these alternate fu els. The major pollutants of the ex haust emissions of c. 1. engi nes are oxides o f ni trogen (NO.) and black smoke. When alcoho ls are used as altern ate fuels, the po llutan ts have to be chec ked specificall y for aldehydes which are carci nogenic in nature. The po lluti on levels o f black smoke, NO, and aldehydes emitt ed through exhaust of engine are reported here on both conventional and insulated versions of c. l. engincs wi th diffcrcnt proportions o f ethanol-di esel and methano l-diesel mi xtures. The non-edible vegetable oil s crude. and esterificd jatropha and pongamia oils are used fo r total repl acement o f diesel fuel on both configurati ons of the engine. T he NO, and smoke Icvels have been found to be lower with both ethano l and methano l induction with both conventional and insulated versions o f the engine in compari son to pure diesel operation. Also, production of aldehydes in the fo rm of fo rmaldehyde has becn fo und to increase with both ethanol and methanol operations. However, the insul ated version of the engine with eth ano l operation helps in reduci ng fo rmaldehyde emissions o f the engine. With the non-edible vegetable oil s, gcneration of smoke is drasti call y increased in compari son to pure diesel o peration. However, with preheating of vegetab lc oi l and inc rcased injection pressure, the smoke levels get reduced and NO, levels increase marginall y.

Effects of Surrounding Gas Condition, Fuel Injection Condition and Fuel Properties on Ignition Delay in Diesel Engines.

Abstract: Ignition delay of diesel fuel sprays is investigated experimentally using a rapid compression expansion machine at operating conditions which are common in modern diesel engines. A comparison of experimental result with published data shows that higher injection pressure and smaller orifice diameter can shorten ignition delay respectively. In an attempt to make the physical ignition delay as short as possible, an experiment is conducted using injection nozzles with tiny orifices processed by a laser drilling. The result shows that ignition delay becomes short as the orifice diameter decreases, but it remains unchanged if the orifice diameter is smaller than 0.05 mm. It is also worth noting that there exists a temperature range around 790 K in which ignition delay remains almost constant being independent of the temperature. This trend is similar to that observed in shock tube studies concerning homogeneous mixture autoignition, implying that the ignition delay obtained with those nozzles is governed mainly by chemical ignition delay.

Method of controlling the ignition in an internal combustion engine and engine with means for carrying out the method

Abstract: The invention relates to a method of adapting the ignition timing in an internal combustion engine to the crankshaft position depending on variations in engine r.p.m., load and overlap between the inlet and exhaust valves. The ratio between combusted and non-combusted gas in the cylinders is computed, and this ratio is utilized, in such a way that the greater the proportion of combusted gas there is, the earlier the ignition will be initiated. The invention also relates to an engine with a control unit (9) and means (11, 13, 14, 15) for computing said ratio, and controlling the ignition timing in the disclosed manner.