JPS62142830A - Control device for fuel injection pump - Google Patents

Abstract

PURPOSE:To enable an engine speed to be maintained to the initial preset value in no relation to a change of timing rack, by respectively providing an adjusting unit, which adjusts a correction amount of each rack corresponding to an output amount of a governor, between an output end of the governor and a pump rack and a timing rack. CONSTITUTION:A positioner 3 is connected with an output end 1a of a governor 1 through a lever 2, and a position of a pump rack 5 can be set to the desired position by action of the positioner 3 through a link 4. While a position of a timing rack 6 can be set to the desired position by action of a positioner 8 through a link 7. And each positioner 3, 8 actuates the links 4, 7 so that their moving amount respectively obtains lp, Ra corresponding to a control air pressure from a control air line 9, while the control air pressure is controlled by handling a control handle 14 to open and close a pressure reducing valve 11. While the governor 1 is actuated for ensuring an injection quantity Q meeting a load L.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a control method applied to a variable timing injection pump in which the injection amount changes by changing the injection timing of a diesel engine.

[Conventional technology]

In conventional jerk-type fuel injection pumps, which are commonly used, the relationship between the pump rack and the injection amount is a linear relationship, and the pump rack is moved by the governor to increase or decrease the injection amount. Controlling the number. Even if the position of the pump rack targeted by the present invention is constant, the injection amount changes when the injection timing is changed. Conventionally, the control method for the variable timing injection pump, which changes the injection amount by changing the injection timing, has been limited to manual operation for test operation of the prototype pump. However, there was no such thing that could be used for engine control.

[Problem that the invention seeks to solve]

Normally, in the case of a marine main engine, the injection amount is in a constant relationship with the load, and in order to protect the engine, a torque limiter is installed to prevent the injection amount from exceeding the allowable value even if the hull resistance increases abnormally during operation. (See Figure 3). This torque limiter is achieved by the governor controlling the pump rack below a certain value corresponding to the load and controlling the injection amount.

In recent years, energy saving policies have become a hot topic, and it has become necessary to finely adjust the fuel injection timing according to the operating conditions of the engine during ship operation. However, with variable timing injection pumps used for this purpose, even if the pump rack is in a fixed position, changing the injection timing changes the injection amount, so the relationship between governor output G and injection amount Q changes, and the conventional method Torque limiter no longer works. Therefore, the engine cannot be protected and safety during vessel operation cannot be ensured.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a variable timing injection pump which eliminates the drawbacks of the conventional apparatus and which can maintain the engine speed at a constant value as initially set even if the injection timing is changed.

[Failure to solve the problem]

In the conventional fuel injection pump according to the present invention, when the timing rack Ra is changed, the relationship between the pump rack Rc and the injection amount Q changes and the fuel injection pump becomes ineffective.

Therefore, first connect them via a device that can change the relationship between the governor output G and pump rack R8, and then simultaneously control the device that changes the relationship between the governor output G and pump rack R0 when controlling the timing rack Ra. However, the structure is such that the relationship between the governor output G and the injection amount Q does not change, and the relationship between the load and the torque limiter is maintained.

[Effect]

With the above configuration, the pump rack R0 is also controlled at the same time as the timing rank Ra is changed, so that the relationship between the governor output G and the injection amount Q does not change, so the pana works as before and ensures safe operation. can.

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS. 1 to 8.

Fig. 1 is a structural diagram of an injection pump control device according to a first embodiment of the present invention, Fig. 2 is a diagram illustrating the operation of a torque limiter, Fig. 3 is a diagram illustrating the operation of the first embodiment, and Fig. 4 5 is a relationship diagram between the injection amount, pump rack, and timing rack of the variable timing injection pump targeted by the present invention, FIG. 5 is a relationship diagram between engine load, timing rack, and maximum cylinder pressure, and FIG.
8 are explanatory diagrams of the second to fourth embodiments, respectively.

In Figure 1, 1 is the governor, 1a is the governor output, 2 is the lever,
3 is a positioner, 4 is a link, and 5 is a pump rack Rc. By the action of the positioner 3, the position of the pump rack Rc can be set to a desired position via a ring 4. Reference numeral 6 denotes a timing rack Ra, 7 a link, and 8 a positioner. By the action of the positioner 8, the position of the timing rack Ra can be set at a desired position via a syringe link 7'ft. 9 is a control air line, 10 is an operating air line and the positioner 3
, 8 operate in response to the control air pressure so that the moving distances of link 4 and link 7 become t, , Ra, respectively. The governor 1 is connected to the pump rack R8 via the lever 2, positioner 3, and link 4 in order to ensure the injection amount Q commensurate with the load.
control. ]] is a pressure reducing valve, 12 is a cam, 13 is a pressure reducing valve, 14 is an operating knob, and 15 is a link. The governor 1 is connected to the operating handle 1 via a link 15 and a pressure reducing valve 13.
4. Timing rack R^ is link 7
, a positioner 8, which is controlled by an operating handle 14 via a lever 15, a cam 12, and a pressure reducing valve 11.

[Effect of the above embodiment]

Regarding the injection pump control device configured as described above, the relationships among the load, injection amount Q, timing Ra, pump rack R0, pump rack correction amount t, governor output G, etc. will be explained with reference to FIG.

The relationship shown by the solid line for the load La is maintained during engine operation. Now, the correction amount t is constant and the timing rack Raf,a
When changing from point to point b, the injection amount Q decreases, so governor 1
moves from point f to point d in order to maintain the injection amount Q, and attempts to increase the burner output G, but at point d, the torque limiter G
Since it is not possible to exceed this point, the injection amount Q decreases as a result, causing a problem that the engine speed decreases.

When changing the timing Ra, the present invention simultaneously changes the correction amount t of the pump rack Rc to adjust the pump rack Ra.
The relationship between the pump rack Rc and the governor output G was corrected by changing the pump rack Rc, and the governor output G of the engine was maintained. This is shown by points e and e in Figure 3.

That is, since the correction amount t of the pump rack Rc is changed at the same time as the timing rack Ra, the result is that the timing rack Ra is changed from point A to point C while keeping the injection amount Q constant, and at the same time the correction amount - By changing from the Jitp'rf point to the e point, the governor output G can also be held constant. As a result, even if the timing rack R is changed, the injection amount Q and the pannier output G remain unchanged from the previous relationship, and are maintained at values commensurate with the load L.

FIG. 6 shows a second embodiment in which the positioner 3 operated by air in the first embodiment is replaced with a rack 20 and a screw 21.
The relationship between the lever 2 and the link 4 is changed through the link.

Figure 7 shows how the positioner 3 is built into the lever 2 and the lever ratio is changed to change the shift pump output G and the pump rack R.
A third embodiment will be shown in which the relationship between the two is changed.

FIG. 8 shows a system in which the timing rack R is mechanically changed by using the operating handle 14, the sill 15, and the mechanism of the positioner 3a shown in FIG. A fourth example is shown below.

〔Effect of the invention〕

Since the fuel injection pump control device of the present invention is configured as described above, even if the timing rack R is changed to minimize the fuel consumption rate, the load and injection amount Q and the injection amount Q
The relationship between the output G and the output G remains the same as before the change, and the engine torque +7 mitzvah maintains the same performance as before the change.

Therefore, even after changing the timing rack R, the function to protect the engine is maintained in the same way, and the governor can maintain the engine speed constant from the initial setting value, making it possible to maintain a safe and economical ship. It is possible to realize flight operations.

[Brief explanation of drawings]

Fig. 1 is a fuel injection pump control structure diagram of a first embodiment of the present invention, Fig. 2 is a diagram explaining the action of a torque limiter, and Fig.
Figure 4 is a diagram explaining the operation of the first embodiment, Figure 4 is a diagram showing the relationship between the pump rack position and the injection amount when the timing rack position t' is taken as a parameter in the variable timing injection pump to which the present invention is applied. 1 is a relationship diagram between engine load, timing rack position, and cylinder maximum pressure, and FIGS. 6 to 8 are explanatory diagrams of the second to fourth embodiments, respectively. l... Governor, 5-, pump rack, 6... Timing rack, Q... Fuel injection amount, G... Governor output amount, t,... Pump rack correction amount, Ra... Timing rack correction amount. Figure 1-4L Kaikawa Figure 3 Pump rack correction amount Figure 4 Rc Pump rack 5th measurement load 100%

Claims (1)

[Claims] In a fuel injection pump having a pump rack for controlling the fuel injection amount and a timing rack for controlling the injection timing, a pump rack is provided between the output end of the governor and the pump rack and the timing rack in accordance with the output amount of the governor. 1. A control device for a fuel injection pump, characterized in that a control device for a fuel injection pump is provided, each having an adjusting device for adjusting an amount of correction and an amount of timing rack correction.