JPS6316575B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a regulator for a fuel injection pump of an internal combustion engine having a centrifugal force regulator operated in proportion to the pump rotation speed, the centrifugal weight being at least actuating the adjusting member against a return force, the adjusting member displacing the quantity control member via the at least one control lever and further modifying the position of the bearing point of the control lever via the angle lever; , and comprising an electric servomotor coupled to an electric control device.

PRIOR ART In particular, when configured as a proportional-integral action regulator with a small, preferably unity ratio,
As demands on the regulating properties of speed governors increase, it is necessary to provide electrically controlled controls for speed governors or to electrically actuate regulators with centrifugal force regulators. A prerequisite for realizing such an effect is a suitable and inexpensive rotational speed signal generator for detecting or measuring the actual rotational speed present in each case.

The governor of the above-mentioned type, which is known from GB 1400299, is designed as a centrifugal force regulator with an electric control and has an inductive speed control for speed detection. It has a signal sensor. In fuel injection pumps, the drive shaft formed as a camshaft rotates non-uniformly, making it difficult to detect the rotation speed using an inductive sensor that works with rotating gears. They are expensive because they require significant electrical outlay to eliminate the signal deviations thus caused. Furthermore, it is necessary to configure the speed governor accordingly and specifically, for example by integrating an inductive speed signal sensor in the speed governor. Furthermore, an inductive speed signal sensor is known from U.S. Pat. No. 3,841,285 which is integrated in a centrifugal governor and cooperates with the rotating gearwheel, but in this case the speed signal is e.g. Another purpose is to control automatic drives or anti-lock systems.

Problem of the Invention An object of the present invention is to provide a speed governor of the type described above, in which the actual rotational speed of the centrifugal force regulator can be measured or detected by a member that is extremely simple in structure and function, and which is similar to the conventional centrifugal regulator. To make it possible to additionally equip a speed machine in a simple form.

Measures for Solving the Problem The measures taken to solve the above-mentioned problem are such that the stroke movement of the adjusting member is measured by a position sensor and sent to the control device in order to detect the actual rotational speed. It's because you're in a situation.

In the case of the speed governor according to the invention, the stroke movement of a regulating member moved by a centrifugal force regulator is measured in order to detect the actual rotational speed, for example to realize a proportional-integral regulator. However, the measurement is carried out by a position sensor which is particularly inexpensive to manufacture and which is extremely simple in construction and function.

Effects of the Invention The advantages obtained by the invention are that a position sensor which is simple in construction can be accommodated in the governor in a space-saving manner and, in particular, can be easily and simply disassembled and assembled during repairs. be. Such position sensors can of course be installed in mass-produced centrifugal governors.
There is no need to consider electrical effects in this centrifugal governor. This makes it possible, inter alia, to additionally equip a mass-produced centrifugal governor for use as a proportional-integral regulator.

EMBODIMENTS Various types of position sensors are well known;
According to a particularly advantageous embodiment, the position sensor is designed as an inductive sensor or an inductive position sensor, if the rotational speed measurement is carried out inductively.

Furthermore, according to the embodiment defined in claim 5, a second position sensor detects or measures the adjustment movement of the electric servo motor, providing a rapid response for the ratio to be 1. Proportionality
Integral motion adjustment is obtained.

DESCRIPTION OF THE PREFERRED EMBODIMENTS A camshaft 1 (not shown) of a fuel injection pump drives a centrifugal force regulator 2, which is connected via a control lever 3 and an intermediate lever 4 to a control rod of the injection pump which serves as a quantity control element. Operate 5. The centrifugal weight operates against a return spring 7 an adjusting member 8 which is at least directly connected to the control lever 3 and to which a plunger 9 of a position sensor 10 is fixed. A ferromagnetic core 11 is arranged on the plunger 9, around which two induction coils 12 are arranged axially side by side in the sensor casing, so that the movement of the plunger 9 allows electronic adjustment. A voltage change is produced within the vessel that corresponds to the position of the plunger. This determines the position of the plunger 9 and thus of the adjusting element 8, the respective position corresponding to a predetermined rotational speed based on the centrifugal force adjuster. A position sensor 10 connects to the insertion portion 1 via an electric wire 13.
4, from which a corresponding cable (not shown) leads to the electronic control unit.

The adjustment element 8 engages the control lever 3 via a tension element 15, and between the adjustment element 8 and the tension element 15 a tension spring 16 is provided.
The use of tension member 15 is only relevant to the regulator design, but is not necessary for the basic functioning of the regulator in the embodiment. The control lever 3 is held at a bearing point 16a and is hinged at a point 17 to the intermediate lever 4. The position of the bearing point 16a is the stroke magnet 1 of the electric servo motor.
8, the stroke magnet 1
At 8, the plunger 19 in the coil 20 is pulled against the spring 21, and the bearing point 16a is then moved via the angle lever 22, which is supported at the point 23. The degree of adjustment is measured via a position sensor 24 which is actuated by a spring 25 by means of an angle lever 22.
in this case the plunger 26 is submerged within the coil 27. In principle, the configuration of the position sensor 24 is similar to that of the position sensor 10.
It corresponds to the configuration of The voltage supply to the coil 20 and the measurement input to the position sensor 24 take place via a wire 28, which leads to a plug-in 29 which is connected to a control device (not shown).

The regulator keeps the rotational speed constant in the desired form,
Otherwise, due to the extremely small degree of proportionality, the position sensor 10, ie the adjusting element 8, must always occupy the same position even when the load changes. This is because each position corresponds to a predetermined rotational speed. In short, as soon as the preselected rotational speed is changed due to some cause, for example temperature or load, the electronic control unit, on the basis of the change signal generated by the position sensor 10, is instructed to initiate a corresponding start. A signal is formed, via which the stroke magnet 18 adjusts the bearing point 16a, which causes the adjusting rod 5 to move correspondingly, so that the injection quantity is adjusted to the desired setpoint rotational speed. is increased or decreased until it reaches . In this case, the regulator operates according to the integral-differential principle, and stability is obtained in this case via the return movement made possible by the position sensor 24 for the adjustment of the angle lever 22. Instead of stroke magnet 18,
Of course, other types of adjustment mechanisms are also useful. This likewise applies to the position sensor 24, which must be configured accordingly to the adjustment mechanism.

[Brief explanation of the drawing]

The drawing is a schematic diagram of a speed governor according to the invention. 1...Camshaft, 2...Centrifugal force adjuster, 3...Control lever, 4...Intermediate lever, 5...Adjustment rod, 6...
Centrifugal weight, 7... Return spring, 8... Adjustment member, 9
...Plunger, 10...Position sensor, 11...
Core, 12... Induction coil, 13... Electric wire, 14... Insertion part, 15... Tension spring, 16a... Location, 17... Location, 18... Stroke magnet, 19... Plunger,
20... Coil, 21... Spring, 22... Angle lever, 23... Location, 24... Position sensor, 25
...Spring, 26...Plunger, 27...Coil, 28
...Electric wire, 29...Plug-in part.

Claims (1)

[Scope of Claims] 1. A speed governor for a fuel injection pump having a centrifugal force regulator operated in proportion to the pump rotation speed, wherein the centrifugal weight operates the regulating member against at least a return force. , at least one
an electric servomotor for displacing the quantity control member via two control levers and for correcting the position of the bearing point of the control lever via an angle lever and coupled to an electric control device; A fuel injection pump of the type characterized in that the stroke movement of the adjusting member 8 is measured by a position sensor 10 and sent to a control device in order to detect the actual rotational speed. Speed governor for. 2. It has a device for inductively measuring the rotational speed, the position sensor 10 is configured as an inductive sensor, and the plunger 9 moved by the adjusting member 8 is connected to at least one inductive coil. 12. A speed governor for a fuel injection pump according to claim 1, which is provided in a fuel injection pump. 3 The plunger 9 has a core 1 made of ferromagnetic material.
Claim 1 or 2 consisting of:
Speed governor for the fuel injection pump described in . 4. The speed governor for a fuel injection pump according to claim 2 or 3, wherein the two induction coils 12 are arranged one behind the other in the axial direction of the plunger 9. 5. Claims 1 to 4 in which the adjustment movement of the electric servo motor is detected and measured via a second position sensor.
A speed governor for a fuel injection pump according to any one of the preceding items.