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On this day there are necessities to increase engine thermal efficiency. This is a priority for the six-stroke engine. Reducing fuel consumption and pollution without any effect on performance will reassessed the concept of automobile. The rapid vaporization of the water during the fifth stroke and the vaporization of water convert waste heat energy into usable power.
Reduction of toxic substances emission from combustion engines can be achieved in automotive exhaust after treatment process is applied based on oxidation and reduction processes which are takes place in catalytic converter. Generally catalytic converter uses platinum group of metals like Pt, Pd and Rh Exhaust system, the least concerned section by the people has the most effective role on the environment as it is that portion of an automobile through which exhaust gases get out from the combustion chamber to pollute the air by their contaminated contents The pollutants contributed by I.
Other sources such as Electric power stations industrial and domestic fuel consumers also add pollution like NOX, SO2 and particulate matters. In addition to this, all fuel burning systems emit CO2 in large quantities and this is more concerned with the Green House Effect which is going to decide the health of earth.
Lot of efforts are made to reduce the air pollution from petrol and diesel engines and regulations for emission limits are also imposed in USA and in a few cities of India. An extensive analysis of energy usage and pollution shows that alternative power systems are still a long way behind the conventional ones. This, in turn, will reduce the CO2 emissions, a gas which is responsible for greenhouse effect. Steadily escalating gasoline prices, increased environmental concerns, and poor international politics have sparked new interests for alternatively fueled vehicles.
There are numerous alternative fuel technologies including gasoline-hybrids, diesels, full electrics, as well as hydrogen and ethanol. These technologies are changing rapidly and consumers are having difficulty trying to decipher which type of vehicle is the most worthy investment. This study provides a simple breakdown of the pros and cons of the alternative fuel technologies as well as a statistical review of the total ownership costs of the vehicle up to , miles.
Katongo Ng'andu. Log in with Facebook Log in with Google. Remember me on this computer. Enter the email address you signed up with and we'll email you a reset link. Need an account? Click here to sign up. Download Free PDF. Abstract On this day the most difficult challenges in engine technology to increase engine thermal efficiency. Related Papers. The automotive industry may soon be revolutionized by a new six- stroke design which adds a second power stroke, resulting in much more efficiency with less amount of pollution.
Keywords; Engine, stroke, combustion, heat, efficiency. The six-stroke engine is a type of internal combustion engine with an advance feature of more power generation some complexity intended to make it more efficient and utilize the fuel.
Two more additional strokes are the fifth stroke, which called water injection stroke while the last stroke is called exhaust stroke. Besides, the stroke engine also known as engine two-stroke, four-stroke and also six-stroke which are new things for us. Chemical, noise and thermal pollution are reduced. These engines almost consist of similar components as that of the four stroke engine with addition of two more valves.
The six-stroke engine is a radical hybridization of two and four stroke engine that the top portion of two stroke engines and the bottom rather the middle section of a four stroke engine.
In six-stroke cycle, two parallel functions occur in two chambers which result in eight event cycle: four events internal combustion cycle and four event external Combustion cycles. A four stroke engine has been modified to a six stroke engine by adding a steam cycle, such that the engine 1 Intakes 2 Compresses 3 Combusts, 4 Exhausts, 5 Injects water 6 Re-exhausts  The rapid vaporization of the water during the fifth stroke is similar to the combustion of the gasoline.
By harnessing waste heat, the added strokes effectively reduce fuel consumption, and therefore emissions, without significantly compromising on power. The big advantages is that, we have got in six stroke engine, the waste of heat created the power in fifth stroke, and power has to be generated in the fifth stroke Due to the waste of heat.
The heat is used to generate the steam from the water which is further used as a working fluid for the Additional Power Stroke. These six processes are as 3. Both the inlet valve and exhaust valves are closed and the air- fuel mixture is compressed. Both valves remain closed.
The combustion of all injected fuel is insured, first, by the supply of preheated pure air in the combustion chamber, then, by the glowing walls of the chamber, which acts as multiple spark plugs.
In order to facilitate cold starts, the combustion chamber is fitted with a heater plug glow plug. In contrast to a diesel engine, which requires a heavy construction, this multi-fuel engine, which can also use diesel fuel, may be built in a much lighter fashion than that of a gas engine, especially in the case of all moving parts.
As well as regulating the intake and exhaust strokes, the valves of the heating and the combustion chambers allow significantly additional adjustments for improving efficiency and reducing noise. Working 1st stroke: The inlet valve 1 is kept open.
Due to cranking, the piston moves downward which results in the formation of a pressure difference due to which pure air enters the cylinder 5. The crankshaft completely rotates for half cycle. The piston moves upwards due to cranking, forcing the pure air into heating chamber 7.
The air at this stage is converted to high pressure. The fuel is injected in the combustion 7 chamber and the fuel is ignited as shown the figure initially compressed air is present in the combustion chamber which results in the formation of fuel air mixture. Part of the heat evolved will pass through the wall of the combustion chamber 8 and it heats up the compressed air present in the air heating chamber.
The crankshaft completes another half cycle rotation in the 2nd stroke. At the end of 2 strokes the crankshaft will rotate 1 complete cycle. This pushes the piston downward and hence is known as the power stroke. The crankshaft rotates for a half cycle. It should be noted that the air in the heating chamber is continuously heated and this results in further increase of pressure. The piston moves upwards and the exhaust gases are removed via this valve.
The crankshaft rotates another half cycle. At this stage the crankshaft completes 2 full cycles. In this stroke, less amount of heat energy is expelled out when compared to the 4 stroke ICE as this heat has already been used to heat the air at high pressure in the air heating chamber 7. The crankshaft completes another half cycle.
The crankshaft will complete 3 full cycles at the end of the 6th stroke. Hence fuel is injected once every in 3 cycles of the crankshaft whereas in a 4 stroke ICE fuel is injected once in every 2 cycles. Graphical Representation: Following is the graphical representation of the six strokes in a cycle. The crankshaft rotates a total of o in 1 complete cycle.
The six strokes are divided into 8 events 8 which are internally classified into 2 categories i. Static event: event occurs without the movement of piston, Dynamic event: event which occurs with the movement of piston. Fig 8. The manufacturers Four Stroke bottom end remains unchanged. The Engine utilizes an overhead short stroke Crankshaft and Piston arrangement which opens and closes inlet and Exhaust Ports leading through the Upper Cylinder Liner.
The Beare Head Technology can be fitted to new production engines or retro-fitted via after market replacement. The top and bottom Crankshaft are connected via a drive chain or toothed belt. The absence of valves, springs, retainers and guides, mean that the Engines bottom end has been freed up from laboring and is allowed to spin up producing more power.
The net result of the Engine is Tractor type pulling torque. Never before realized from a Four Stroke Internal Engine, the sort of steady locomotive 9 type performance gained can only be likened to Steam Locomotives or Diesel Engines.
The working of Beare head six stroke engine can be understand with the help of following diagram: Fig 9. Working of Beare Head six stroke engine 10 Dual Fuel Six Stroke Engine: This is the modern approach to six stroke engine which uses the combination of two fuels.
Working: The cycle of this engine consists of six strokes: 1. Intake stroke 2. First compression stroke 3. First combustion stroke 4. Second compression stroke 5. Second combustion stroke 6. Exhaust stroke Fig Working of Dual Fuel six stroke engine 1 Intake or Suction stroke To start with the piston is at or very near to the T. A rotation is given to the crank by the energy from flywheel or by a starter motor when the engine is just being started.
As the piston moves from top to bottom dead centre the rarefaction is formed inside the cylinder i. The pressure difference causes the fresh air to rush in and fill the space vacated by the piston. The admission of air continues until the inlet valve closes at B. The air is compressed up to compression ratio that depends upon type of engine. The combustion of the charge commences when the piston approaches T. Here the fuel in the form of fine spray is injected in the combustion space.
The atomization of the fuel is accomplished by air supplied. The air entering the cylinder with fuel is so regulated that the pressure theoretically remains constant during burning process. In airless injection process, the fuel in finely atomized form is injected in combustion chamber.
When fuel vapors raises to self ignition temperature, the combustion of accumulated oil commences and there is sudden rise in pressure at approximately constant volume. The combustion of fresh fuel injected into the cylinder continues and this ignition is due to high temperature developed in engine cylinder.
However this latter combustion occurs at approximately constant pressure. Due to expansion of gases piston moves downwards. The reciprocating motion of piston is converted into rotary motion of crankshaft by connecting rod and crank. During expansion the pressure drop is due to increase in volume of gases and absorption of heat by cylinder walls. The combustion products from the first compression stroke are recompressed and ut ilized in the second combust ion process before the exhaust stroke.
In typical diesel engine combustion the combustion products still contains some oxygen. The combustion of the charge commences when the piston approaches to TDC.
The second fuel injected into recompressed burnt gas can be burnt in the second combustion process. In other words combustion process of the second fuel takes place in an internal full EGR Exhaust Gas Recirculation of the first combustion.
This second combustion process was the special feature of the proposed Six Stroke Diesel Engine. Much of the noise associated with automobile engine is due to high exhaust velocity. During this stroke pressure inside t he cylinder is slightly above the atmospheric value.
Some of the burnt gases are however left in the clearance space. The exhaust valve closes shortly after TDC. The inlet valve opens slightly before the end of exhaust stroke and cylinder is ready to receive the fresh air for new cycle.
Since from the beginning of the intake stroke the piston has made six strokes through the cylinder Three up And Three down.
In the same period crank shaft has made three revolutions. Thus for six stroke cycle engine there are two power strokes for every three revolutions of crank shaft. Difference on the basis of engine parameters Graphical comparison Fig P-V diagrams for Otto cycle Area under the curve of a six stroke engine is more than the four stroke engine.
Thus it is clear from the graph that the work done by the 6 stroke engine is greater than the 4 stroke engine. Fig 9 is in reference with a Petrol engine. The work done by six stroke engine is greater than a 4 stroke engine for the same amount of fuel used. Difference on the basis of valve timing  15 Factors Contributing To Increased Thermal Efficiency, Reduced Fuel Consumption And Pollutant Emission 1 The heat that is evacuated during the cooling of a conventional engines cylinder head is recovered in the six-stroke engine by the air heating chamber surrounding the combustion chamber.
As a result of this less heat is wasted and this increases the thermal efficiency. In the six stroke- engines, intake takes place on the first stroke and exhaust on the fourth stroke. The water pump and fan outputs are reduced. Possibility to suppress the water cooler. Friction losses, theoretically higher in the six-stroke engine, are balanced by a better distribution of pressure on the moving parts due to the work being spread over two strokes and the elimination of the direct combustion.
The compression ratios can be increased because of the absent of hot spots and the rate of change in volume during the critical combustion period is less than in a Four stroke. The absence of valves within the combustion chamber allows considerable design freedom.
The specific power of the six-stroke engine will not be less than that of a four-stroke petrol engine, the increase in thermal efficiency compensating for the issue due to the two additional strokes.
This lead to very smooth operation at low speed without any significant effects on consumption and the emission of pollutants, the combustion not being affected by the engine speed.
These advantages are very important in improving the performance of car in town traffic. Furthermore, its ability to run with fuels of vegetable origin and weakly pollutant gases under optimum conditions, gives it qualities which will allow it to match up to the strictest standards. The difference in inflammability or antiknock rating does not present any problem in combustion. Its light, standard petrol engine construction, and the low compression ration of the combustion chamber; do not exclude the use of diesel fuel.
Methanol-petrol mixture is also recommended. All technological experience and production methods remain unaltered. The cost of the modification to the cylinder head combustion chamber and heating chamber is balanced by the simplification of several elements, particularly by the lightening of the moving parts, the reduction of the cooling system, the simplification of direct injection with no spark plug, etc. The reduction in the dimensions of the tank and its housing in a vehicle are also to be taken into consideration.
WebEngine Comparison Compare engines side by side; XTO Offshore. V8 L / hp; - hp. V6 L / / hp In-line 4 / hp; - 30 hp. Four . Webplace in every turn as in two stroke engine and lubrication as in four stroke. Fuel injection takes place in piston charger. 2. PRINCIPLES OF SIX STROKE ENGINE A six stroke is . WebDownload Free PDF. Download Free PDF. Six Stroke Engine Six Stroke Engine. Vish jagadale. Continue Reading. Download Free PDF. Download. Continue Reading. .