CN2591245Y

CN2591245Y - Combustion system of diesel engine with high performance

Info

Publication number: CN2591245Y
Application number: CN 02277881
Authority: CN
Inventors: 杨连生; 易南勋; 杨靖
Original assignee: Individual
Current assignee: Individual
Priority date: 2002-12-16
Filing date: 2002-12-16
Publication date: 2003-12-10
Anticipated expiration: 2012-12-16

Abstract

The utility model discloses a combustion system of a diesel engine with high performance, particularly a diesel engine which uses a helical intake passage, a shallow basin-shaped combustion chamber and an improved valve timing. The utility model is suitable for improving the indexes of dynamic, economic and emission performance of the diesel engine.

Description

A kind of high performance diesel combustion system

The utility model relates to a kind of high performance diesel combustion system, particularly uses the diesel engine of spiral inlet duct, shallow pot shape firing chamber and improvement valve timing, is applicable to raising engine power performance index and fuel economy, emission performance index.

At present, the technological scheme of well-known high performance diesel combustion system is a lot, but they or excellent performance but complex structure, and is perhaps simple in structure and performance is general.Though the combustion system of diesel engine of existing use spiral inlet duct, shallow pot shape firing chamber has advantage of simple structure, on the coupling of key parameters such as intake swirl and firing chamber and valve timing, also reaches due effect far away.Therefore be necessary to provide a kind of novel high performance diesel combustion system.

The purpose of this utility model provides a kind of high performance diesel combustion system, and it is simple in structure, but function admirable.

The purpose of this utility model is achieved in that promptly becomes a kind of high performance diesel combustion system of the present utility model with spiral inlet duct, shallow pot shape firing chamber and improved valve timing mechanism optimization of matching.

Below in conjunction with Figure of description the utility model is further described.

Fig. 1 is firing chamber of the present utility model, oil injecting nozzle scheme schematic representation.

Fig. 2 is a port timing schematic representation of the present utility model.

Fig. 3 is a spiral inlet duct scheme schematic representation of the present utility model.

Fig. 4 is the checking contrast properties plotted curve of design of the present utility model on 1105 diesel engines.

The performance curve of the best prototype performance curve 12. of 1. piston 2. shallow pot shape firing chambers, 3. sprays, 4. oil nozzles, 5. exhausts, 6. air inlets, 7. cylinders, 8. intake duct spiral sections, 9. intake duct straightways, the 10. German advanced persons' of Benz Co. OM401 diesel engine performance curve 11.1105 diesel engines after adopting design improvement of the present utility model on the best prototype of 1105 diesel engines among the figure.

Be illustrated in figure 1 as firing chamber of the present utility model, oil injecting nozzle scheme schematic representation, its valve, cylinder cap, piston ring etc. are not drawn.Wherein, oil injecting nozzle (4) is positioned at the oblique upper of shallow pot shape firing chamber (2), and shallow pot shape firing chamber (2) have a small amount of biasing on piston (1).

Be illustrated in figure 2 as port timing schematic representation of the present utility model, wherein exhaust (5) in air inlet (6) before, A point exhaust valve closes, and is atdc 12 ± 2 degree; B point intake valve closes, and is 45 ± 5 degree after bottom dead center; C point exhaust valve is opened, for before bottom dead center 50 ± 5 the degree; D point IVO Inlet Valve Open is budc 12 ± 2 degree.

As Fig. 3 is spiral inlet duct scheme schematic representation of the present utility model, and wherein (7) are cylinder, and (8) are the intake duct spiral section, and (9) are the intake duct straightway, and both are smooth to be connected to spiral inlet duct of the present utility model.The figure mid point is scribed ss the center line of cylinder, intake valve, and the α angle is the established angle of spiral inlet duct of the present utility model, and its optimum value is 80 ± 5 degree.

The utility model is done open further below with reference to embodiment:

In conjunction with Fig. 1, Fig. 2 and Fig. 3, the internal diameter of shallow pot shape firing chamber and depth ratio are 3: 1, and the Offset on piston (1) is 5% of a cylinder diameter; The valve timing data are that A point exhaust valve closes, and are after top dead center 10 degree; B point intake valve closes, and is 40 degree after bottom dead center; C point exhaust valve is opened, for BBC 50 the degree; D point IVO Inlet Valve Open is before top dead center 10 degree.Established angle α is 80 degree.

Promptly obtain as shown in Figure 4 premium properties (12) based on this embodiment's Proof-Of Principle model machine, it the full load scope than 1105 prototypes (11) fuel-economizing 25.7 gram/kilowatt. hour, than the OM403 diesel engine of German Benz Co. on average reduce by 13.1 grams/kilowatt-hour.As seen from Figure 4, more obvious at the operation interval oil-saving effect that is lower than 6KW.As seen on the coupling of key parameters such as intake swirl and firing chamber and valve timing, have the potential to be tapped very much, but also do not have up to now perfect come from instrument theoretical or practice and can directly use with through design object.

Claims

1. a high performance diesel combustion system is characterized in that using simultaneously spiral inlet duct, shallow pot shape firing chamber and valve timing design, and wherein spiral inlet duct adopts the established angle of 80 ± 5 degree, and port timing is: exhaust valve closes 12 ± 2 degree After Top Center; B point intake valve closes at 45 ± 5 degree after bottom dead center; 50 ± 5 degree Before Bottom Dead Center left by exhaust valve; IVO Inlet Valve Open is at budc 12 ± 2 degree.