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- 10 страниц
- 2011 год
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Фрагменты работ
Introduction
1. Working cycles of automobile engines
1.1 Duty cycle diesel engine.
1.2 Duty Cycle four-stroke gasoline engine.
Conclusion
References
1.1 Duty cycle diesel engine.
At the first stroke (intake), the piston moves from TDC to BDC, the intake valve open and the exhaust valve is closed. In the cylinder creates a low pressure 0,08-0,09 MPa, through an inlet valve in the cylinder enters the air. In the cylinder air is mixed with combustion products left over from the previous cycle and is heated to a temperature of 35-75 ° C. On the indicator diagram that corresponds to the tact line 7-1. In the second stroke (compression) piston moves from BDC to TDC, both valves are closed. Since the degree of compression in a diesel engine is 15-22, the pressure and temperature of gas in the cylinder is greatly increased, by the end of the bar they reach, respectively, the values of 3.6 MPa and 425-625 ° C. On the indicator diagram that corresponds to the tact line 1-2.
...
1.2 Duty Cycle four-stroke gasoline engine.
Sequence of alternating cycles is the same as in the work cycle diesel engine, except the following differences:
1. If you stroke the cylinder enters a combustible mixture of gasoline vapor and air (or gaseous fuel and air). At the end of stroke when the piston is at BDC, the pressure in the cylinder is equal to 0,08-0,09 MPa and temperature of 45-105 ° C.
2. Since the compression ratio of gasoline and natural gas engines are much smaller than that of diesel engines, and is about 6-9, then the pressure and temperature of the working fluid at the end of the compression stroke do not exceed 0,9-1,5 MPa and 325 - 525 ° C.
3. At the end of the compression stroke the working mixture is ignited by electrical sparks, and its rapid combustion occurs when the piston is near TDC, the maximum pressure during the combustion of 3,5-6,0 MPa and temperature of 2025-2425 ° C.
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1. Учебник – Устройство автомобилей, «Академия», М.2009г.
2. Автомобили и тракторы, «Просвещение», М.2009г.
3. Теоретические основы работы двигателей, М.2008г.
1. Tutorial - Installation of cars, "Academy", M.2009.
2. Cars and tractors, "Enlightenment", M.2009.
3. Theoretical foundations of the engines, M.2008.
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