JPS5968528A - Fuel injection timing regulator device for diesel engine - Google Patents

Abstract

PURPOSE:To set an optimum injection timing in response to both a change in fuel properties and a change in loading conditions by providing two independently controllable additional regulator mechanisms in the fuel injection device. CONSTITUTION:An advancer adjustor cam 11 is connected to a linkage which transmits a signal from a governor 1 to a fuel injection device 2, and a cam roller 12 of a fuel properties lever 13 is inserted into the cam hole. The fuel properties lever 13 is pivotable mounted onto a ballast lever 14, and its end is connected to a piston rod of a cylinder 15. An end of the ballast lever 14 is connected to a piston rod of a cylinder 16. By fixing the cylinder 16 and operating the cylinder 15, the injection timing is controlled in response to a change in the fuel properties. By fixing the cylinder 15 and operating the cylinder 16, the injection timing is controlled in response to a change in loading conditions.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a fuel injection system for a diesel engine controlled by an output signal from a speed governor with two additional adjustment mechanisms to adjust the changes in the properties of the fuel used and the loading status of the ship. It is possible to adjust the optimal fuel injection timing in response to both changes in the fuel injection timing, thereby improving the thermal efficiency of marine diesel engines.

It is known that increasing the maximum combustion pressure of a diesel engine improves thermal efficiency and reduces fuel consumption. Using this, in marine diesel engines,
Load indicator (fuel notch) indicates a certain range before and after continuous normal output.
It is common practice to control the fuel injection timing using the governor's output signal to increase the maximum combustion pressure. In addition, in order to compensate for shifts in ignition timing and changes in combustion speed due to changes in the properties of the fuel used, an oil quality lever (described later) is provided as an additional adjustment mechanism to adjust the fuel injection timing in response to changes in oil quality. It is also known to speed up or slow down the process.

However, with these methods, the fuel injection timing is fixed with respect to the load guideline, so the highest thermal efficiency can be obtained for a certain planned line, and it is also possible to adapt to changes in the oil quality of the fuel. However, it is possible to maintain the highest thermal efficiency in response to changes in the loading status of the ship (changes in the propeller operating point determined by the amount of cargo, dirt on the propeller and hull, atmospheric conditions, operational conditions, etc.). The drawback was that it was impossible to do so.

In view of this point, the present invention equips the fuel injection device of a diesel engine controlled by the output signal of the speed governor as described above with two systems of additional adjustment mechanisms that can be independently controlled. This makes it possible to adjust the optimal fuel injection timing to respond not only to changes in quality but also to changes in the ship's loading status, thereby improving the thermal efficiency of marine diesel engines and saving labor costs. This is an attempt to save money.

Embodiments of the present invention shown in the drawings will be described below.

In the figure, 1 is a speed governor, and 2 is a fuel pump main body, which includes a suction valve 3, an escape valve 4, and a discharge valve 5. A plunger 6 is driven by a fuel cam 8. Governor 1
The output signal is transmitted to the fuel pump 2 by rotating the eccentric shaft 7 by the adjusting connecting rods 9 and 10 via the link mechanism, and the opening and closing of the suction valve 3 and the escape valve 4 are controlled, and the movement of the plunger 6 is controlled. Accordingly, fuel injection is performed from the discharge valve 5.

The diesel engine fuel injection device itself, which is controlled by the output signal of the speed governor as described above, is conventionally known.

] 1 is an advance adjustment cam connected to the link mechanism, and a cam roller 12 is fitted into the cam hole of the cam.
2 is attached to one end of a bell crank-shaped oil lever 13, and as is conventionally known, the relative position of the cam hole and the cam roller 2 regulates the fuel injection start timing or end timing.

Conventionally, the base of the bell crank-shaped oil lever 13 was pivoted to a fixed part of the device as shown in FIG.
The other end of the oil lever 13 is connected to a piston rod of a cylinder 15 with a positioner attached to the tip of a lever 19 pivoted to a fixed fulcrum 18.

The parastripe lever 14 is connected to the lever 19 by a connecting rod 2o, and its tip is connected to a piston rod of another cylinder 16 with a positioner that is pivotally supported on a fixed part of the device. The positioner-equipped cylinders 15 and 16 are all operated by a control fluid and a working fluid such as air or oil, but they may also be operated electrically or manually.

The present invention has the above-described configuration, and is equipped with an additional adjustment mechanism for controlling fuel injection of the fuel pump 2 by the output signal of the speed governor 1, and as described later, changes in oil quality are controlled by the cylinder 15. Corresponding to this, it is possible to adjust the fuel injection timing by the cylinder 16 in accordance with the loading condition of the ship.

That is, when controlling in response to changes in oil quality, the cylinder 16 is fixed and the cylinder 15 is operated, and conversely, when controlling in response to the loading state of the ship, the cylinder 15 is operated.
It is sufficient to fix the cylinder 1.5 and operate the cylinder 16, or, when the combination of the two is required, it is sufficient to operate both cylinders 1.5 and 16 together.

When cylinder 16 is fixed and cylinder 15 is activated,
The oil quality lever 13 rotates around the bin 21, and as a result, the cam roller 12 does not rotate around the bin 21, but moves within the cam hole of the advance angle adjustment cam 11 to change its position, as shown in FIG. The injection timing can be adjusted in response to changes in oil quality in exactly the same way as the conventional example shown in .

Further, when the cylinder 15 is fixed and the cylinder 16 is operated, the parastripe lever 14 rotates about the fixed fulcrum 17. In this case, since the lever 19 connected by the connecting rod 2o also rotates at the same angle about the fixed fulcrum 18 at the same time, the relative positions of the oil lever 13 and the parastripe lever 14 do not change. Therefore, the parastriver 14
When the lever rotates around the fixed fulcrum 17, the oil quality lever 1
3 also rotates together with this, and the cam roller 12 does not rotate around the fixed fulcrum 17, but moves within the cam hole of the advance angle adjustment cam 1 to change its position and adjust the fuel to match the loading situation. Injection timing can be adjusted.

Furthermore, if the cylinders 15 and 16 are actuated at the same time, the oil quality lever 13 rotates around the bottle 21 and together with the parastripe lever 14 around the fixed fulcrum 17, so the cam roller 12 moves By moving the advance angle adjustment cam 11 within the cam hole of the advance angle adjustment cam 11 and changing its position, delicate adjustments can be made that correspond to both changes in oil quality and changes in loading conditions.

As detailed above, according to the present invention, two systems of additional adjustment mechanisms, that is, cam rollers 12, each of which can be independently controlled, are added to the fuel injection device of a diesel engine that is controlled by the output signal of the speed governor. Since it is equipped with an adjustment system that rotates around the pin 21 and an adjustment system that rotates around the fixed fulcrum 17, the fuel injection timing can be adjusted in response to not only changes in oil quality but also changes in the loading status of the ship. can be adjusted, which has the effect of improving the thermal efficiency of the marine diesel engine and reducing the fuel consumption rate.

[Brief explanation of drawings]

FIG. 1 is a system diagram showing an embodiment of the present invention, and FIG. 2 is an enlarged view of main parts showing a conventional example. DESCRIPTION OF SYMBOLS 1... Speed governor, 2... Fuel pump main body, 9... Connecting rod for adjusting escape valve, 10... Connecting rod for adjusting suction valve, 11... Advance angle adjusting cam, 12... Cam roller , 13...
Oil quality lever, 14...Parast lever, 19...Lever, 20.Connecting rod, ■ - Fixed fulcrum, ○... Moving fulcrum.

Claims (1)

[Claims] 1. A fuel injection timing adjustment device for a diesel engine, characterized in that a fuel injection device for a diesel engine controlled by an output signal from a speed governor is provided with two systems of additional adjustment mechanisms each of which can be independently controlled.