JPS5993937A - Fuel injection timing controller - Google Patents

Abstract

PURPOSE:To standardize the kind of a controller, by building both the detecting part of the reference rotation signal of an engine crankshaft and the detecting part of the rotation signal of a fuel injection pump cam shaft in the fuel injection timing controller. CONSTITUTION:In the case of a device performing feedback control so as to control the fuel injection timing to make it coincide with a target value, the reference rotation signal of an engine crankshaft is detected by a detecting part 7. The rotation signal of a fuel injection pump cam shaft is detected by a detecting part 3. A phase shift between the both signals is obtained, and the pressure of oil in a pressure oil chamber 101 is regulated. In this way, the kind of a controller can be standardized.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a fuel injection timing adjustment device for use in a diesel internal combustion engine.

Conventionally, there has been an electronically controlled injection timing adjustment system that detects operating conditions such as the rotational speed of the internal combustion engine using various sensors and operates an actuator using electronic control to obtain the optimum fuel injection timing for the engine. In order to obtain a rotation reference signal of the shaft, a pickup is installed in the engine part to detect the rotation reference signal, and the fuel injection timing is determined by comparing the rotation reference signal with the rotation signal of the fuel injection pump camshaft of the fuel injection pump using the rotation reference signal as a reference. was measuring.

However, in cases where engine crankshaft rotation detection and fuel injection pump rotation detection are performed in separate parts, the fuel injection pump manufacturer also uses a rotation reference signal detector that is compatible with the rotation reference signal detector installed by the engine manufacturer. Therefore, since fuel injection pump manufacturers also use various rotation signal detectors to match the various rotation reference signal detectors used by each engine manufacturer, many types of rotation signal detectors on the fuel injection pump side are designed. The problem is that it is complicated and the serviceability is poor because it has to be prepared and the adjustment is different depending on the type.

SUMMARY OF THE INVENTION The present invention aims to solve the above-mentioned problems, bayonet the types of fuel injection timing adjustment devices, and provide a fuel injection timing adjustment device with good serviceability. The above object is achieved by incorporating both the signal detection section and the rotation signal detection section of the fuel injection pump camshaft into a fuel injection timing adjustment device.

The present invention will be explained below using examples.

1 and 2 relate to an embodiment of the present invention, FIG. 1 is a sectional view along the central axis, and FIG. 2 is a sectional view taken along the central axis.
This is a cross-sectional view showing the phase adjustment assembly of the big amplifier in the -llfr plane.

In FIG. 1, a flange 1 is fixed to a fuel injection pump main body 14 with bolts 2, a hydraulic chamber 101 is provided in the flange 1, and a hydraulic piston 11 is freely moved by the action of fluid flowing into the hydraulic chamber 101. can be moved axially. The hydraulic piston 11 is provided with a slope 1101, and this slope 11
Shifter 12 that faces and contacts 01 and is slidable in the radial direction.
is arranged, and the shifter 12 is a bin 12 for the eccentric shaft of the eccentric cam.
01, the eccentric cam 13 is rotated by the radial movement of the shifter 12, and the eccentric cam 16 is connected to the driving bin 901 on the drive side fitted with the eccentric cam 16.
The configuration is such that the phase of the hub 4 housing the hub 4 can be changed.

On the other hand, the outer peripheral part 402 of the hub 4 and the cover 10 are rotatably fitted together, and the cover 10 is fixed with bolts 17 to the end cover 9 on which the driving bin 901 is installed. are integrated.

In the above configuration, drive-side uneven portions 1001 are formed at equal intervals on the outer circumference of the cover 10, which is a drive-side rotating member that rotates integrally with the drive shaft of the engine, and furthermore, bolts 6 are formed on the flange 1.
An electromagnetic drive-side pickup 7 is screwed onto the bracket 5 and faces the drive-side uneven portion 1001. Further, the bracket 5 has an elongated hole that is movable with respect to the flange 1 along the direction of rotation of the cover 10.

Furthermore, the fuel injection pump camshaft 15 on the driven side is different from the key 1.
An electromagnetic type driven side pickup 3 is formed with the same number of driven side uneven parts 401 as the driving side uneven parts 1001 of the cover 10 on the hub 4 which is a driven side rotating member positioned by 8, and is screwed onto the flange 1. I am facing it. As shown in FIG. 2, the driven side uneven portion 401 has a plane 403 parallel to the axis of the mounting hole of the electromagnetic driven side pink-up 3.

When the fuel injection timing adjustment device is operated after the adjustment as described above, the electric signal from the drive-side pickup 7 and the electric signal from the driven pickup 3 are input to a computer (not shown), and within the computer, the electric signals from the drive-side pickup 7 and the electric signals from the driven pickup 3 are input to The phase angle shift of the coaxial shaft on the driven side is calculated and the fuel injection timing is determined.

Then, the hydraulic pressure in the hydraulic chamber 101 is adjusted by comparing the engine speed, target value, etc. with a target value stored in advance in the computer and adjusting the opening degree of a hydraulic pressure regulating valve (not shown). Feedback control is performed to adjust the phase of the fuel injection pump camshaft 15 with respect to the shaft so that the fuel injection timing matches the target value.

In the fuel injection timing adjustment device configured as described above, a coupling device (not shown) is attached to the stud bolt 902 of the end cover 9 to the drive shaft of the engine, and the rotation of the cover 10 integrally connected to the end cover 9 causes the cover to be covered. Electric signals corresponding to the number of uneven portions 1001 formed on the outer periphery of the pickup 7 are generated in the pickup 7 . On the other hand hub 4
There are also the same number of driven side uneven parts 401 as the driving side uneven parts 1001 formed on the outer periphery of the cover 10, and similarly generates an electric signal to the driven side pickup 3.

Therefore, if the phases of the electric signals generated by the drive-side pickup 7 and the driven-side pickup 3 are matched at the optimum angle state of the actuator, both the drive-side and driven-side The fuel injection timing is obtained as an electric signal from the pickups 7 and 3 as a phase angle shift.

In order to align the positions of the electric signals on the driving side and the driven side in the most retarded state, as shown in FIG. along the parallel plane part 40 of the hub 4.
3 and the concave portion at the tip of the positioning pin 19 are fitted, and the center of the electromagnetic big amplifier mounting hole 1 and the convex portion of the hub 4 are aligned and fixed.

Next, move the bracket along the rotational direction through the elongated hole of the bracket 5 so that the protrusion 101 on the drive side and the protrusion at the tip of the electromagnetic pickup are aligned and face each other, and fix it with the screw 6 shown in FIG. . Finally, the positioning bin 19 is removed and the electromagnetic pickup 3 is assembled to easily complete the positioning.

In addition, in this embodiment, the electromagnetic pink-up 3 on the driven side
The phase angle measurement on the driven side was carried out using the uneven part 401 provided on the outer circumference of the hub 4. However, as long as it is on the driven side, there is no need to specifically limit the measurement. Furthermore, an uneven portion may be provided on a rotating member within the speed governor that rotates integrally with the camshaft.

According to the present invention, it is possible to provide a fuel injection timing adjustment device that can be used in any type of diesel internal combustion engine, and particularly in a machine that uses a mechanical fuel injection timing adjustment device using flyweights. Even in the case of a controlled diesel internal combustion engine, the excellent effect is that it can be made into an electronically controlled diesel internal combustion engine that can be precisely controlled by simply replacing the fuel injection timing adjustment device with the fuel injection timing adjustment device of the present invention. play.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view along the central axis of an embodiment of the present invention,
FIG. 2 is a cross-sectional view taken along the section 1-1 in FIG. 1, showing the phase adjustment assembly of the pink-up. 3... Driven side pickup, 4... Hub forming a driven side rotating member, 401... Driven side uneven portion, 7...
- Drive side pickup, 10...Cover forming the drive side rotating member, 1'001...Drive side uneven portion, 15...
Fuel injection pump camshaft. Representative Patent Attorney Takashi Okabe Figure 1 4 Figure 2 Procedural amendment 2 Name of the invention Fuel injection timing adjustment device 3 Person making the amendment Relationship to the case Patent applicant 1-1 Showa-cho, Kariya City, Aichi Prefecture (426) )Representative of Nippondenso Co., Ltd. Kengo Toda 4th Director Masaru 1-1 Showa-cho, Kariya-shi, Aichi Prefecture 448 Column for detailed explanation of the invention of the specification subject to the amendment and drawings. 6. Contents of the amendment ("complicated" on page 2, line 18 of the 11 specification is corrected to "complicated". (2) "Eccentric cam 13" on page 4, line 2 of the same document is changed to "small". (3) In the same book, page 4, line 18, ``along the direction of rotation'' should be changed to ``eccentric cam 13''.
"Along the direction of rotation (direction of the arrow shown in Figure 2)." (4) "Target value, etc." on page 5, line 15 of the same document is corrected to "load, water temperature, etc." (5) In the same book, page 6, line 15, "in the optimum angle state" is corrected to "in the most retarded state." (6) In the 4th line of page 7 of the same book, ``Insert into the recessed part 1'' is changed to ``
Insert the recess and correct the flange 1. (7) In the 5th line of page 7 of the same book, “fixed in agreement” was changed to “
Match. "In this state" is corrected. (8) Change the “Protrusion 101” on page 7, line 6 of the same book to [Protrusion 10
I will correct it to 01J. (9) Figure 1 in the drawings will be corrected as shown in the attached sheet. (Among the 101 drawings, Figure 2 has been corrected as shown in the attached sheet. Figure 1A

Claims (1)

[Claims] In a fuel injection timing adjustment device that adjusts fuel injection timing according to operating conditions of an internal combustion engine, a drive side uneven portion provided on a rotating member on the drive side, and a drive side provided opposite to the drive side uneven portion. a pickup, a driven side unevenness portion having the same number as the driving side unevenness portions provided on the driven side rotating member, and a driven side pickup provided opposite to the driven side unevenness portion, A fuel injection timing adjustment device that measures fuel injection timing based on a signal generated by a driving pickup and a signal generated by a driven pickup.