JPS5820373B2 - Internal combustion engine load adjustment device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a load adjustment device for automatically preventing overload operation of an internal combustion engine. The aim is to adjust the total load of the internal combustion engine so that this total load does not exceed the output of the engine.

By the way, the load on an internal combustion engine includes the main load, which is the work to drive the main engine, which is the original purpose of use, and the secondary load, which is the work to drive the auxiliary machinery, which is the auxiliary purpose of use. The original work of driving a propeller and the auxiliary work of driving a pump etc. correspond to each of these.

However, if the output of the internal combustion engine has a margin compared to the main load, as long as the secondary load is added within this margin, the total of both loads will not exceed the above output. Although the engine will not be forced to operate under overload, if a secondary load is added when there is no margin for this, or if a secondary load is added that exceeds the margin, the total of both loads will be Since the output is exceeded, the engine is forced to operate under overload.

Such overload operation of an internal combustion engine is extremely undesirable because it not only has a negative effect on the service life of the engine, but also unnecessarily increases fuel consumption and tends to cause a decrease in thermal efficiency due to incomplete combustion. do not have.

In order to deal with the above-mentioned problems and automatically prevent overload operation of an internal combustion engine, the present invention calculates the margin of output from the output of the engine and the main load, and calculates the margin by this margin. The load is compared with the secondary load, and if the latter exceeds the former, the latter is eliminated.

Therefore, according to the present invention, the handling of the secondary loads is selected under conditions that give priority to the primary load, so that the total load thereof is adjusted so as not to exceed the output of the internal combustion engine,
Only when there is a margin in the engine output compared to the main load, the surplus output will be consumed by the secondary load within the margin.

Hereinafter, an embodiment shown in the drawings will be described in detail.

In the figure, 1 is the amount of electricity T detected by detecting the rotational speed of the internal combustion engine.

2 is the amount of electricity T.

This is a function calculator for obtaining a signal representing the amount of electricity T1 corresponding to the output torque of the internal combustion engine based on the signal represented by T1.

However, since the amount of fuel supplied to the engine is variable, the output torque of an internal combustion engine does not change in proportion to changes in the rotational speed, but it does change in correlation with the rotational speed. This is well known.

Since this correlation is specific to each internal combustion engine, it is possible to actually measure it in advance and find the function between rotation speed and output torque, and then create a relational expression to calculate the latter from the former. It is.

Therefore, the above-mentioned function calculator 2 employs, for example, an arithmetic register or the like programmed to be able to calculate the output torque from the detected rotational speed based on such a relational expression.

Note that these rotation speed detector 1 and function calculator 2 capture the output of the internal combustion engine in the form of torque, and convert this into an electrical quantity T.
1, and therefore, if there is any other means that can obtain the signal of the electrical quantity T1, it may be substituted.

3 is a torque detector adopted as a means for detecting the torque required to drive the main engine as the main load and converting it into a signal of electrical quantity T2, which is the torque required to drive the propulsion propeller in the case of a ship. Torque is targeted.

Reference numeral 4 denotes a torque detector employed as a means for detecting the torque required to drive the auxiliary equipment as a secondary load and converting it into a signal of the electrical quantity T3, which is used temporarily for example in a pump or the like. The target is the torque required to drive equipment.

However, these torque detectors 3 and 4 are equipped with strain gauges or photoelectric conversion elements to detect the "torsion" of the rotating shaft of the main engine or auxiliary equipment, which changes depending on the magnitude of the load torque. A device that can detect the electric quantity of torque T2 or T3 and output a signal corresponding to the electric quantity T2 or T3 is adopted.

Reference numeral 5 designates an acceleration calculator employed as a means for determining the margin of the output of the internal combustion engine with respect to the main load as a quantity of electricity.
The calculation T2-ΔT is performed, and the above margin is obtained as a signal representing the electrical quantity ΔT.

Reference numeral 6 denotes a comparator used as a means for determining whether or not the secondary load is within the margin of the internal combustion engine output, and for example, when T3>△T, an electrical overload signal is generated is now output.

Reference numeral 7 denotes a suitable amplifier for amplifying the overload signal, and operates necessary means to prevent overload operation of the internal combustion engine, such as an overload alarm; It is assumed that enough power is output to

In the above-described configuration, it is assumed that the internal combustion engine is now being operated and its output is used for main engine drive work 1 as the main load, for example, rotating the propulsion propeller.

Then, the output of the internal combustion engine is first detected by the rotation speed detector 1, and the amount of electricity T is determined according to the rotation speed at that time.

After the signal is converted into a signal and detected, the function calculator 2
Then, it is converted into a signal of electrical quantity T1 corresponding to the output torque.

On the other hand, the torque required for the main engine drive work at this time is detected by the torque detector 3 by converting it into a signal of the electrical quantity T2.

Both signals whose electric quantities are T1 and T2 detected in this way are input to the addition/subtraction calculator 5, where T1-T2
By the calculation =ΔT, the margin of the engine output applied to the main load is detected as a signal of the electrical quantity ΔT.

On the other hand, the work of driving an auxiliary device as a secondary load, for example, the torque required to operate a pump, is detected by the torque detector 4 by converting it into a signal of the electrical quantity T3.

This signal is used in the comparator 6 to convert the electric quantity △T
is compared with the signal.

In other words, it is determined whether the secondary load is within the engine output margin.

As a result, the electric quantities T3 and △T of both signals are T3≦△T
If so, since the secondary load is within the margin of the engine output, the comparator will not output an overload signal, and therefore the auxiliary drive work as the secondary load will be reduced by the margin. It will be done.

However, if T3>△T, the secondary load exceeds the engine output margin, so the comparator outputs an overload signal, which is amplified by the amplifier 7.
In addition to operating the overload alarm 8, the clutch 9 for disconnecting the secondary load is also operated, so that no auxiliary equipment driving work is performed as the secondary load.

Note that the comparison between the electric quantities T3 and the signals ΔT is carried out in the comparator 6 even while the auxiliary equipment driving work as a secondary load is being performed.

Therefore, even if it is initially determined that the secondary load is within the engine output margin and auxiliary equipment drive work is started, the engine output may subsequently decrease or the primary load may increase. As a result, the output margin decreases, and as a result,
If the previous state of T3≦△T changes to the state of T3>8T, an overload signal is output from the comparator 6 at this point, so the work of driving the auxiliary equipment as a secondary load is immediately reduced. It will be stopped, and only the main engine drive work as the main load will continue.

As described above, according to the present invention, the total of the main load and the secondary load is automatically adjusted so as not to exceed the output of the internal combustion engine, and the adjustment is performed so that the main load is prioritized and the secondary load is given priority. This is done by selectively handling the load.

Therefore, according to the present invention, only when there is a margin in the engine output compared to the main load, and within the margin,
This will be consumed by the secondary load, so overload operation of the internal combustion engine due to the addition of the secondary load is
This can be effectively prevented automatically, and therefore harsh use of the engine can be avoided, and the effect that the service life of the engine will not be shortened can be expected.

Furthermore, according to the present invention, priority is given to the main load in any case, so the main engine driving work is not interrupted.
Therefore, the present invention can be applied to an internal combustion engine of a ship whose propulsion propeller cannot be stopped during navigation, and the present invention can be expected to produce effects without any benefit or detriment.

[Brief explanation of the drawing]

The figure is a block diagram showing an embodiment of the invention. 1...Rotation speed detector, 2...-Function calculator, 3゜4...Torque detector, 5...
Addition/subtraction operator, 6... Comparison operator, 8...
1. Overload alarm, 9...Subordinate load disconnection clutch.

Claims (1)

[Claims] 1 means for detecting the output of the internal combustion engine; means for detecting the main load; means for detecting the secondary load; means for outputting an overload signal only when the latter is greater than the former compared to the load, and the means for preventing overload operation of the internal combustion engine is operated based on the overload signal. A load adjustment device for an internal combustion engine, characterized in that: