Thermal cycle engine cars

Thermal summed up the session for internal combustion engines in the following operations:

1 - Operating compression material.
2 - Acquisition of material of heat when operating at high pressure.
3 - the spread of the rule of operating.
4 - the loss of part of the heat at low pressure until it reaches operating pressure material to the first case.

 All courses involve thermal in four operations mentioned above as well as the following two processes:
A - discharge of exhaust gases (combustion products) at the end of the diffusion process.
B - enter a new shipment to the cylinder (a mixture of air and gasoline engines fumigated or air only in engines Alhakna) If allocated journey full session for each of these two processes together Mhuarin compression and spread the session thermal four-Mashaweer, but if processes in part from all of my career proliferation and thermal compression session was with Mhuarin.



And thermal cycles followed by the importance of different types of internal combustion machines are: -
1 - Otto cycle: a session you are working on engines and evaporated using gas or gasoline or kerosene as fuel.
2 - cycle diesel: a working session engines Alhakna which used heavy fuel oils.
3 - joint session: It combines the Otto cycle, diesel cycle and working on engines fast Alhakna used on cars and tractors.

Thermal cycles for engines used on cars and tractors:

First: the Quartet session for gasoline engine

 It takes place in four of the piston and endeavors, two laps to annex column The following figure shows the piston runs four different components for the session: -

 

 

We note that he stop the pressure when you start the ignition and ignition when fully on the compression ratio in the engine.


Second: bilateral session of the petrol engine

Are four events in the session (drag and pressure capability and exhaust) in two games of the piston and one roll of rolls column annex. And called this session bilateral as they are in two games two (of the piston) only ie in one roll of the column annex does not contain drive this session on the valves as is the case in engine session Quartet but that the piston itself works valve definition covers and reveals a row slots in the cylinder walls Tqok denominator slots access and exhaust in the session described above and note that each half landing in this session is a way to effectively accompanied extend gases above the piston, while resulting in pressure partial shipment of new withdrawals and stored beneath the piston every run rally completes expel exhaust above the piston and compressed shipment leaking from conversion slot, while the lower part of the piston is a love clouds where new shipment enters the crankcase and the four operations are necessary, a (drag and pressure, ignition and expulsion) are just two in two games.

 
Comparison between the Quartet session and bilateral session for gasoline engines 

Quartet

 1 - are in two laps to annex and four column Mashaweer of the piston

2 - run ignition every two laps to annex column

3 - no valves and camshaft

4 - large complex and many parts are relatively expensive

5 - not the possibility of an early combustion normal because the heat

6 - in fuel economy

7 - less than capacity bilateral

8 - torque is a regular presence journey run every two laps to annex column

Bilateral

 1 - are in one roll of the column facility Mhuarin with piston

2 - run every lap of the ignition facility

3 - free of valves and camshaft

4 - small inexpensive simple installation

5 - high heat and combustion may occur early

6 - consume more fuel to exit exhaust part with

7 - high capacity

8 - torque  regularly for the presence of career run every lap of a column Annex 

The foregoing it can be concluded that in the session Quartet no way effectively every four games of the piston or every two to column Annex Vtkon three games remaining of each session, a dubbed quarters inefficient and is a games Ttaghizah to run effective and should be noted that the valve access connection valveruling fed while related exhaust valve Bmkhvv sound that expel which gases from combustion into the atmosphere and in the previous table assume that the intake valves and exhaust valves open and close at the point dead Lower point dead Supreme exactly and indeed that happen before and after varying little to improvethis engine capacity and can record the changes that occur within the engine cylinder, using a special device called outlined by which to draw a curve showing the relationship between pressure and volume of the shipment within the cylinder through a full cycle and carried out this operation in the research labs of the companies producing cars.

By : Divani