JPS61226538A - Engine speed control device - Google Patents

Abstract

PURPOSE:To enable reduction of the idling rotation to the limit level at anytime by providing a signal corresponding with the difference between the minimum limit rotation to be set with correspondence to the engine vibration and the engine rotation to regulating means. CONSTITUTION:The detection signal from a vibration detector 10 is provided to a bandpass filter 11 to take out only such frequency component as most harmful to the engine 1 then it is amplified and detected respectively through an amplifier 12 and a detector 13 and fed to an adder 14 to be added with a setting signal corresponding with the engine rotation immediately before engine stall. Consequently, the signal to be produced from the adder 14 has the level corresponding with the minimum limit rotation considering resonance of engine 1. Said signal is compared with the actual rotation detected through a rotation detector 4 to produce a differential signal from an extractor 5. On the basis of said differential signal, rotation control of engine 1 under idling is executed.

Description

[Detailed Description of the Invention] [Field of Application of the Invention] The present invention relates to an engine rotation speed control device that controls the rotation speed of an engine, and is applicable to a type of use of a K engine such as a diesel engine for a special railway vehicle. The present invention relates to an engine speed control device suitable for engines with long idling times.

[Background of the invention]

For example, diesel locomotives for railways (diesel engine army,
Normally, the engine of a diesel car is kept running continuously. When the vehicle is stopped at a station, it is idling (no load) when coasting, braking, etc.
The idling time is 70 to 70% of the engine's total operating time.
It's as slow as 80%. Therefore, in order to reduce fuel consumption and realize economical operation, it is effective to suppress fuel consumption during idling.

From the above point of view, control systems that stop the engine when idling and automatically restart it when necessary have been proposed as engine control devices for automobiles and railway vehicles.
Some have been made fun of. However, since it is necessary to use battery power when starting the engine, the above-mentioned control has the drawback that the battery power is severely consumed when starting is repeated frequently. In order to avoid this problem, K may consider a method of lowering the idling rotational speed as much as possible during idling. However, in conventional engines, mechanical governors are usually used, and it is difficult to arbitrarily set the rotation speed, and the rotation speed control is also insufficiently accurate. There is a problem in that it is necessary to set the target value somewhat thicker than the minimum limit value, which forces unnecessary high rotation.

However, in recent years, in order to improve the fuel efficiency of engines and make them maintenance-free, studies have progressed on electronic control of engines, and devices that can precisely control the engine rotational speed to an arbitrary value have been proposed.

Such an engine speed control device will be explained with reference to the drawings.

FIG. 2 is a system diagram of a conventional engine speed control device. In the figure, 1 is an engine of a diesel car, and 2 is a fuel injection pump that supplies engine IK fuel.

The fuel injection pump 2 injects an amount of fuel according to an input control signal to adjust the engine speed.

3 is a control device that controls the engine speed, and outputs the above-mentioned control signal to the fuel injection pump 2. Reference numeral 4 denotes a rotation speed detector that detects 10 rotations of the engine, and outputs a whistle signal according to the detected rotation speed. Reference numeral 5 denotes a master controller provided in the diesel train, and IN to 5N indicate stages of notches for commanding the acceleration of the engine 1.

The control device 3 includes a subtracter 6, a proportional controller 7, AND gates (analog gates) A1 to A6. NOR gate N, OR
It consists of a gate (analog gate) O. AND
Gate A6 is the output L6 of proportional controller 7 and NOR gate N.
Let the output of be its input. AND gate Al"As has one input as a signal corresponding to a predetermined fuel injection amount, and the other input as input for each stage I of the notch of mask controller 5.
The output is N to 5N.

Next, the operation of the engine speed control/device described above will be explained. The mask controller 5 is operated, for example, the notch stage 3
When a signal is output from N, a set value L3 is output from AND game (As). This set value L3 is input to the fuel injection pump 2 via the OR circuit O. The fuel injection pump 2 injects fuel into the engine 1 according to the input signal L3, thereby controlling the engine 10 rotation speed. The rotation of the engine 1 is detected by a rotation speed detector 4, and a detection signal is input to a subtracter 6. The subtracter 6 subtracts the detected rotation speed from a preset rotation speed, for example 600 rpm, and outputs the deviation ΔV.

The deviation ΔV is input to the proportional controller 7, and the proportional controller 7 outputs a value L6 corresponding to the deviation ΔV.

However, since the AND gate As is blocked, the value L6
is not output from AND gate A6.

On the other hand, when the master controller 5 is operated OFF, no signal is output from any of the stages IN to 5N of the notch.
A signal is output to the AND gate A6, and the AND gate A6 becomes conductive. That is, when the master controller 5 is operated to 0FFK, the engine 1 becomes idling, and this idling is detected by the NOR game)N and the AND game)As.

AND game) Due to the conduction of As, then the proportional controller 7
The value L6 output from the 01-t gate.

is applied to the fuel injection pump 2 via. As a result, engine 1 has an idling core set value of 600τp.
The rotational speed will be controlled to rn.

By the way, the factors that determine the minimum limit of engine rotation speed include a limit that causes so-called engine stalling (engine stoppage) and a limit that is limited because abnormal imaging occurs in the engine due to a mechanical resonance phenomenon. To explain the latter in more detail, when the engine rotation speed, that is, the period of the reciprocating movement of the piston, decreases, this period becomes excessive in line with the specific movement frequency of the engine and its holding system (supporting members, root protection rubber, etc.). If this vibration continues, mechanical damage will occur. In the case of diesel engines for railway vehicles, the limits based on resonance are higher than the limits that cause engine stalling;
It is close to the actual operating speed.

Generally, the above-mentioned resonance rotational speed exists at several locations among the total rotational speed, but the highest one is in the range of about 500 to 550 rpm.

The above-mentioned resonance rotational speed varies depending on each engine, and is not constant because it changes due to aging of the holding system. In the above conventional control device, -
The idling speed (setting input to subtraction 56)
fjL 600 rpm), so in order to avoid resonance it is necessary to set this setting value to a high value with some margin. Therefore, even with the above-mentioned control device, there still remains the problem that unnecessary high rotation is forced.

[Purpose of the invention]

The object of the present invention is to solve the above-mentioned conventional problems, and to reduce the idling speed of the engine to the limit, thereby reducing fuel consumption and enabling economical operation. Provides control equipment.

[Summary of the invention]

In order to achieve the above object, the present invention detects engine vibration using a vibration detector, sets the lowest limit rotational speed of the engine according to the detected engine vibration frequency, and sets the engine vibration frequency according to the detected engine vibration frequency. The present invention is characterized in that a signal corresponding to the deviation between the rotation speed of the engine and the rotation speed of the engine is outputted to the adjustment means of the engine.

[Color examples of invention]

Hereinafter, the present invention will be explained based on illustrated embodiments.

FIG. 1 is a system diagram of an engine speed control device according to an embodiment of the present invention. In the figure, parts that are the same as those shown in FIG. 2 are given the same reference numerals, and explanations thereof will be omitted. 10 is engine 1
This is a motion detector installed in the housing of the engine 1 to detect vibrations of the engine 1, and for example, a known accelerometer or the like is used. 1
1 is the vomiting signal detected by the vibration detector 10,
A band pass filter (BPF) that selects frequency components harmful to the engine 1; 12 is a band pass filter 1;
an amplifier (AMP) that amplifies a signal selected from 1;
13 is a detector (D E 'l') that rectifies and smoothes the signal amplified by the amplifier. 14 is a detector 13
output signal G and a preset value, e.g. 450 rp
The output of this adder 14 is input to the subtracter 6. The preset value (450 rpm) is selected to be a rotational speed at which the engine 1 is on the verge of stalling.

A bandpass filter 11, an amplifier 12, a detector 13, and an adder 14 are newly added to the control device 3α of this embodiment.
is configured.

Next, the operation of this embodiment will be explained, but since the operation of the parts other than the above-mentioned added parts is the same as the operation described above, the explanation will be omitted. The detection signal of the vibration detector 1° is input to the bandpass filter 11, where only frequency components harmful to the engine 1 are extracted, amplified and detected, and a signal G is generated.
is input to the addition 514 as setting No. 1 (450 rpm
signal corresponding to ) and addition′! It will be IL. Here, if the gain of the amplifier 12 is set appropriately, the signal G can be set to the rotation speed that is the difference between the minimum engine rotation speed determined by photographing the engine at that time and the engine rotation speed on the verge of stalling. It can be a corresponding value. When determined in this manner, the value output from the adder 14 becomes a signal corresponding to the lowest limit rotation speed in consideration of the resonance of the engine 1.

This signal is compared with the actual rotation speed detected by the rotation a detector 4, and the subtractor 5 outputs a signal Δ■ representing the difference. Thereafter, as described above, the rotational speed of the engine 1 during idling is controlled based on this difference signal Δ■.

In this way, in this embodiment, the vibration detector detects the image of the engine, and based on this detected value, the minimum limit rotation speed is set in consideration of the engine co-fitting phenomenon, and the engine rotation speed during idling is set. Since the number is set to the above-mentioned minimum limit rotation speed, it is possible to always reduce the rotation speed to the limit value without causing a co-#i event during idling.
It is possible to save fuel consumption and carry out economical driving.

In addition, mechanical wear and tear on the engine itself can be reduced, and furthermore, manual readjustment for differences in the vibration system of each engine itself, aging, etc. is not required, and the trouble of ff[lI can be saved. In addition, when setting the lowest limit rotation speed, the engine rotation speed (450?"7) r that is on the verge of stalling
n) is bias-added, it is possible to prevent the engine from stopping even if mechanical resonance does not occur.

In addition, in the description of the above embodiment, an example was described in which one vibration detector is installed in the engine casing, but vibration! The number of S detectors is not limited to one, but it is also possible to provide a plurality of S detectors and use the maximum value or average value of their outputs. Furthermore, the installation location is not limited to the housing, and can be installed at any appropriate location. In addition, in the explanation of the above embodiment, an example using a simple proportional controller was explained, but 1
5-IJ Taking into account the stability, responsiveness, etc. of the remainder, differential and integral control may be used together, or an appropriate time element may be provided. Furthermore, in the case of a diesel locomotive, the settings fJi (Ls~Ls
) does not become the set value for fuel injection but only becomes the set value for the engine speed, and the engine speed control during idling according to the present invention does not require any changes.

〔Effect of the invention〕

As described above, in the present invention, the vibration of the engine is detected by +ff using the vibration detector, and based on this detection, the minimum limit rotation speed is set in consideration of the phenomenon of engine coexistence. Don't wake up the resonance trench Z (
, it is possible to reduce the rotation speed to the limit value,
It is possible to save fuel consumption and carry out economical driving. In addition, mechanical wear and tear on the engine itself can be reduced, and
Differences in the vibration system of the Tani engine itself? It eliminates the need for artificial readjustment due to changes over time, and saves troublesome labor.

[Brief explanation of the drawing]

FIG. 1 is a system diagram of an engine speed control device according to an embodiment of the present invention, and FIG. 2 is a system diagram of a conventional engine speed control device. 1...engine, 2...self fuel injection bonder, 3g...rotation speed control device, 4...rotation speed detector, 5... Master control 2.6・
...Subtractor, 7...Proportional controller, 10.
... Vibration detector, 11 ... Band pass filter, 12 ... Amplifier, 13 ... Detector, 14 ... Adder

Claims (4)

[Claims] 1. A vibration detector that detects vibrations of the engine; and a vibration detector that detects vibrations of the engine; and a vibration detector that detects vibrations of the engine; a setting means for setting a minimum limit rotational speed of the engine; a calculation means for calculating a deviation between the value set in the setting means and the rotational speed of the engine; and a control signal corresponding to the deviation to the adjustment means. An engine rotation speed control device comprising an output means for outputting an output. 2. The engine speed control device according to claim 1, wherein the vibration detector is attached to a casing of the engine. 3. In claim 1, the setting means:
a bandpass filter that selects a frequency component harmful to the engine from among the vibrations detected by the vibration detector; an amplifier that amplifies the signal of the frequency component selected by the bandpass filter; and a signal from the amplifier. An engine rotational speed control device comprising: an adder that adds a signal corresponding to a rotational speed of the engine on the verge of stopping when engine vibrations are not considered. 4. In claim 1, the output means:
An engine rotation speed control device comprising means for detecting idling of the engine, and a controller for outputting the control signal corresponding to the deviation when idling is detected by the means. .