JPS58124059A - Fuel supplying device for diesel engine - Google Patents

Abstract

PURPOSE:To perform the functions of a timer, a governor, a regulator and a distributor by a method wherein an electric valve device, effecting a cycle of intercepting, reliefing, conducting, reliefing and intercepting a branched path, is provided in each branched path for introducing fuel from an injection pump to an injection valve. CONSTITUTION:The branched paths 9-12, for introducing the fuel from the injection pump 2 to each injection valves 5-8, are branched from an injection pipe 13. Control to conduct and stops the conduction of the electric opening and closing valves 14-17 for effecting the interception of the branched paths 9-12 as well as electric switching valves 18-21 for switching the relief and conduction of the branched paths 9-12 is effected by an electronic control circuit 23. Each electric valve devices effect the cycle of intercepting, reliefing, conducting, reliefing and intercepting upon every one revolution of the injection pump 2, therefore, distribution from the injection pump of a simple constitution, excluding the functions of the timer, the governor, the regulator, the distributor or the like, to each injection valves as well as the control of the beginning time and the amount of the injection may be effected optionally.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a fuel supply device for controlling fuel injection amount and fuel injection timing of a diesel engine.

Traditional fuel metering mechanism linked to the accelerator lever, Thailand! There is also known a fuel injection device for a diesel engine in which an injection valve is connected to an injection pump with an integrally built-in governor, and the injection pump controls fuel distribution, fuel injection amount, injection timing, etc. . There are two types of injection pumps: one that uses a single plunger to distribute fuel, and one that has as many pumps as the number of cylinders in the engine, but since they are all mechanically constructed, The number of parts is large and the sg is also complicated.

In the future, in order to install diesel engines in military vehicles and supply fuel according to engine operating conditions, environmental conditions, etc., several functions will be required for each of the above-mentioned functions such as metering, governor, and timer. It is necessary to add sensors, actuators, etc., and as a result, the structure of the conventional fuel supply device described above becomes increasingly complicated and the cost increases.

In view of the above drawbacks, it is an object of the present invention to provide a fuel supply device that can realize complex and highly accurate fuel supply control 41 with a simple and inexpensive configuration, and includes a timer, a governor,
Using an injection pump with a simple configuration that excludes a fuel metering mechanism, distribution mechanism, etc., each branch i! Interruption, relief, continuity of 1 branch route, lj! j-7
The present invention is characterized in that an electric valve device is provided, and each electric valve device performs the functions of timer, governor, metering, and dispensing.

Hereinafter, the present invention will be described in detail with reference to the drawings.

FIG. 1 shows a first embodiment in which the present invention is applied to a four-cylinder diesel engine. The injection pump 2 is a single plunger pump, which is typically a familiar diesel injection pump without the timer, governor, metering, and distribution mechanisms.

1. Set the trap so that it moves, and discharge fuel four times per revolution. , is composed of.

Injection valves 5 to 8 are installed in each cylinder of the engine 4, and when the pressurized fuel introduced into the injection valves 5 to 8 reaches the valve opening pressure, the injection valves 5 to 8 inject fuel. It's becoming a trap.

9 to 12 are branch paths for guiding fuel from the injection pump 2 to each injection valve 5 to 8, and each branch path w19 to 12rI'i
, is branched from the injection pipe 13 connected to the discharge port of the injection pump 2.

14 to 17 companies are electric on-off valves that are used to cut off branch routes 9 to 120, respectively. When energized, electric on-off valves 14 to 17 open branch routes 9 to 12, respectively, and close each branch meridian 9 to 12 when energization is stopped. The structure is as follows. 18~
21 is the IJ IJ-7 of each branch path 9 to 12, an electric switching valve for conduction switching, and each electric switching valve 18 to 21 is a branch between each electric on-off valve 14 to 17 and each injection valve 5 to 8. Route 9~
12, there is a relief boat 18, 18mm, and 18mm provided in the middle of the electric switching valve 18-21. A, 20m, and 21m are connected to the fuel tank lK11 via a relief pipe 22. When the electric switching valves 18 to 21 are energized, the suction boat 1 aB
, 19B, 20B, 2 tB and injection boat 18C', 1
9C, 20C, and 21C are connected, and when the electricity is turned off, the suction baud) 18B and 19B are connected.

2oB, 21B and relief boat 18A, t? A.

20A and 21A are connected to each other. Each branch path 9 to 12 is provided with one electric on-off valve 14 to 17 and one electric switching valve 18 to 21, respectively. ~17 and each electric switching valve 18~21
It consists of two electric and dynamic valve housings. Electric on-off valve 14~
The electronic control circuit 23 controls the energization and de-energization of the electric switching valves 17 and the electric switching valves 18 to 21 . here,
Each electric valve device is operated every rotation of the injection pump 2! ! Each electric valve device is configured to perform a cycle of disconnection, relief, conduction, relief, and shutoff, and each electric valve device starts IJ-7 and starts injection before the injection pump 2 starts discharging fuel. The configuration is such that 31A is cut off after the pump 2 finishes discharging fuel.

Next, the operation of the above-mentioned component will be explained with reference to FIGS. In addition, in FIG. 2, the horizontal axis indicates the crank rotation angle of the engine 5.

The injection pump 2 is connected to the engine 5 as shown in FIG.
The same amount of fuel is discharged four times during rotation. Now, if we inject Z in the order of the numbers of injection valves 5 to 8,
First, at a time point Δ1, which is a little before the time point Q1 when the first fuel discharge from the injection pump 2 starts, the electric on-off valve 14 corresponding to the injection valve 5 is opened, and the other electric on-off valves 15.16.1
7 is not energized, the branch passages 10, 11, and 12 are in a blocked state. Therefore, the fuel discharged from the injection pump 2 passes only through the electric on-off valve 14 and reaches the electric switching valve 1B, but since the electric switching valve 18 is not energized at this time, the fuel is relieved from the relief boat 18A. Therefore, in this state, the internal pressure of the injection pump 2 does not increase significantly.

Next, when the electric switching valve 18 is energized at time A2, the electric switching valve 18 switches to conductive state 1iK, and fuel Fi is sent from the injection boat 18C to the injection valve 5. As a result of this νζ, the fuel pressure to the injection valve 5 reaches the valve opening pressure, and the solvent is injected from the injection valve 5.

Thereafter, when the power supply to the electric switching valve 18 is stopped at time A3, the pressure from the relief boat 18A is restarted, and the fuel pressure to the injection valve 5 suddenly drops, so that injection from the injection valve 5 is terminated.

After that, Q! The discharge of fuel from the injection pump 2 is completed at the time point A4, and then at the time point A4, the power supply to the electric on-off valve 14 is stopped and the branch passage 9 is opened. IWI7IT is done.

Through the above operations, the amount of fuel can be adjusted at the start of injection (point A
This is done by controlling the period from , ) to the stop of injection (time As), that is, the energization time of the electric switching valve 18, and the injection timing is controlled by the energization start time of the electric switching valve 18 (time A, ). .

Thereafter, the electric on-off valve 15 corresponding to the next injection valve 6 is energized, and the same operation follows (B in FIG. 2).

C, D), injection from the injection valves 6, 7.8 is performed, and the injection pump 2Q1 cycle is completed.

In this manner, fuel is smoothly distributed to each of the injection valves 5 to 8.

In addition, electric on-off valves 14 to 17 and electric switching valves 18 to 21
The structure is such that it can operate under high pressure, so there is no problem in its operation.

Figure L3 and Figure 4 show the second embodiment of the present invention,
In this embodiment, the electrically operated valve device consists of one rotary IIi valve actuator 24 that switches between quick shutoff, relief, and conduction, and the other configurations are the same as those of the above embodiment.

A rotor 26 is rotatably fitted in the sleeve 25 of the first valve 24.
A permanent magnet 27 is provided at one end of the rotor 26.
Three substantially U-shaped iron cores 28 are arranged close to each other with a phase shift around the outer periphery of one end, and a coil 29 is wound around each iron core 2BK.

The solenoid coil 29 is enclosed in an outer case 30GC fixed to the sleeve 25. The three solenoid coils 29 are energized, energized, and energized by an electronic control circuit (not shown).
Stop control is performed. At the center of the rotor 26 is a passage 31.
This passage 31 is provided with a distribution tube 32 that opens on the outer periphery of the rotor 26.

The sleeve 25 button has an injection boat 33 and a relief boat 34 that can communicate with the distributor boat 52 formed at intervals in the circumferential direction, and these three boats s
2, 55, and 54 are located on the same circumference. Further, the injection boat 33 and the relief port 34 are arranged so as to be in the same phase as two of the three solenoid coils 29 that are in contact with each other.

On the other hand, the passage 31 is connected to the annular λ mouth groove 36 through the communication hole 55.
9, an inlet boat 57 is formed in the sleeve 25 and is in constant communication with the inlet groove 36.

This Romeli purchase valve 240 input robot 37 and injection boat 53 are connected to one of the plurality of M routes, for example, the branch route 9.
The relief boat 34 is connected to the relief pipe 22.

Next, the operation of this second embodiment will be explained.

FIG. 4(a) shows the rotary electric valve 24 in a ruptured state, and at this time, the rotor 26 is distributed.

-Tubo-) 52 is the relief port 34 and the injection boat 3
I am not familiar with either of 5. @Figure 4 (1)) shows the relief state of the valve 24, and at this time, the relief boat 34 and the distributor boat 32 are electrically connected, and the fuel in the injection pump 2. If the fuel is sent from the relief boat 34, the fuel is returned to the fuel tank. FIG. 4(c) shows a state in which four branch passages are passed through. At this time, since the injection boat 33 and the distributor tab 32 are facing west, the fuel discharged from the injection pump is directed to the injection valve 5. and is injected from the injection valve 5. The states shown in FIGS. 4(a), 4(b), and 4(c) are all determined by energizing one of the three renoid coils 29, so the valley rotary motor-operated valve 24 is used to shut off, relieve, conduct, The same effects as in the first embodiment can be obtained by performing a cycle of relief and cutoff.

Although the above two embodiments have been described, the present invention is based on the above two embodiments.
This is not limited to the JM example. For example, the injection pump may be rotated in synchronization with the rotation speed of the engine, and the fuel discharge of Shino' may be adjusted every 2 rotations according to the number of cylinders. so that each electric valve device is connected to two of the injection pumps.
It may be shut off, relieved, or configured for each rotation.

As is clear from the above description, the present invention uses an electric valve device to block a branch passage connecting an injection pump and an injection valve.
Relief, conduction, ')')-7. Since the cycle of shutoff is performed, fuel is sent to each injection valve from an injection pump with a simple configuration that excludes functions such as timer, governor, metering, and distribution. distribution, injection start timing, and concentration amount can be controlled arbitrarily, and simple IIJW can be used to perform complex and precise control according to operating conditions, environmental conditions, etc. .

[Brief explanation of the drawing]

Fig. 1 is a configuration diagram showing the first embodiment of the present invention, Fig. 2 is an operational characteristic diagram of the first embodiment, and Fig. 3 is a partially longitudinal rkJ diagram of main parts showing the second embodiment of the present invention. Prisoner 4 (a). Q) 1 and (C) are cross-sectional views of main parts showing the operation of the second embodiment, respectively. 2・φ・・Injection pump, 4・・04 cylinder diesel engine, 5, 6, 7, 8・・・Injection valve, 9 1
0 11 12・0・branch route, +4.15,1 6.
17 --- Electric switching valve 24 --- Rotary electric valve (electric valve device). Patent Applicant Japan Auto Parts Research Institute Co., Ltd. Patent Attorney Akira Aoki Patent Attorney Kazuyuki Nishi Patent Attorney Kyo Nakayama Patent Attorney Akira Yamaguchi Figure 2 (C) (b) 2 Continued from page 1 0 Inventor: Masayuki Abe 14, Iwatani, Shimohakaku-cho, Nishio-shi, Japan Auto Parts Research Institute Co., Ltd. 14, Iwatani, Shimohakaku-cho, Nishio-shi

Claims (1)

[Claims] 1. Fuel is supplied from the injection pump to the injection valves corresponding to the number of cylinders of the engine. In the middle of each rounded branch route, a cycle of blocking, relief, conduction, relief, and a disconnection of the branch route is applied. The electric valve device is configured to rotate and discharge a number of fuels corresponding to the number of cylinders of the engine for each rotation, and each electric valve device is configured to perform one rotation of the injection pump. A fuel supply device for a diesel engine according to claim 1, which performs a cycle of cutoff, relief, conduction, relief, and cutoff every rotation. (v) Each of the electric valve devices starts relief before the injection pump starts discharging the IIP material, and shuts off after the injection pump finishes discharging the solvent. A fuel supply device for a diesel engine according to item 1 or 2.・4. The electric valve device consists of an electric on-off valve for shutoff, an IJ-7, and an electric switching valve for conduction switching, and the electric switching valve is installed between the electric on-off valve and the injection valve. A fuel supply device for a diesel engine according to any one of claims 1 to 3, which is provided with a valve. 1. According to any one of claims 1 to 3, the electric valve device is a rotary gastric valve that switches between shutoff and conduction. Fuel supply device for the diesel engine described.