High-pressure common rail type diesel engine and design method thereof
A design method and diesel engine technology, applied in mechanical equipment, engine components, machines/engines, etc., can solve the problems of difficult high-pressure common rail diesel engines, cumbersome average effective pressure values, and low accuracy of results, and achieve good fuel injection Features, comprehensive performance index improvement, simple structure effect
Inactive Publication Date: 2017-07-28
刘峰
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Problems solved by technology
The prior art has the following deficiencies in the process of calculating the Sabad cycle: 1) The calculation of the average effective pressure value is relatively cumbersome, and it is necessary to calculate the specific volume of each point and the cycle work.
2) The existing technology usually adopts the definite integral method to calculate the cyclic work, which has a large amount of calculation and is very complicated, and is not easy to use in practical applications
The calculation results of complex and cumbersome Sabad cycle process are not very accurate, making it difficult to obtain accurate and practical high-pressure common rail diesel engines based on the results
Method used
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Embodiment
[0072] Embodiment: Taking the vehicle diesel engine of Weichai National V emission standard as an example, the design method of the high-pressure common rail diesel engine of the present invention is illustrated. The relevant technical parameters of the Weichai National V emission standard vehicle diesel engine are shown in Table 1.
[0073] Table 1 Diesel engine related technical parameters
[0074]
[0075] Calculation example of Sabad cycle under four rail pressures, Table 2 shows the maximum pressure of Sabad cycle corresponding to four target rail pressures.
[0076] Table 2 The maximum cycle pressure corresponding to the four target rail pressures
[0077]
[0078] It should be noted that the maximum temperature and pressure of the diesel engine Sabad cycle under the four rail pressures are different, but the inlet and exhaust temperatures of the ideal gas are the same, that is, Figure 5 and Image 6 The gas states at point 1 and point 5 are the same. Table 3 ...
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The invention relates to a high-pressure common rail type diesel engine and a design method thereof. The design method comprises following steps: the circular absorbing heat is calculated; the circular heat releasing amount is calculated; the circular heat efficiency is calculated; the circular average pressure is calculated; the air pressure of the Szabad circular middle point 5 is calculated, and according to the calculated circular absorbing heat, circular heat releasing amount, circular heat efficiency, circular average pressure and air pressure of the Szabad circular middle point 5, the high-pressure common rail type diesel engine is designed. The high-pressure common rail type diesel engine comprises an oil supply pump assembly, an oil spraying device assembly, a common rail assembly and an electric control unit; the electric control unit controls the oil supply pump assembly, the oil spraying device assembly and the common rail assembly to move, the oil supply pump assembly compresses the fuel oil to the needed pressure, fuel oil is conveyed to the common rail assembly for waiting to be distributed to the corresponding oil spraying device assembly, and the high-pressure common rail type diesel engine designed through the method is more precise and practical.
Description
technical field [0001] The invention belongs to the field of diesel engines, and in particular relates to a high-pressure common rail diesel engine and a design method thereof. Background technique [0002] High-pressure common rail diesel engine refers to a fuel supply machine that completely separates the generation of injection pressure and the injection process from each other in a closed-loop system composed of a high-pressure oil pump, a pressure sensor and an electronic control unit. The high-pressure common rail system can meet the requirements that other fuel injection systems are difficult to meet, such as low fuel consumption, low emission, high-pressure injection, flexible fuel injection characteristics and control of fuel injection pressure. It can be said that the high-pressure common rail electronically controlled fuel system can effectively reduce the emission of diesel engines and improve the performance of diesel engines. [0003] The Sabad cycle is also c...
Claims
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IPC IPC(8): F02M63/02
CPCF02M63/0225F02M63/027
Inventor 刘峰
Owner 刘峰
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