JPH02174600A - Rotation stabilizer for generator engine - Google Patents

Abstract

PURPOSE:To enable corresponding instantaneously to the increase of an electric load by stopping a power supply to an adjusting resistor, when the electric load increase. CONSTITUTION:A generator 1 is operated by an engine 2 to supply an electric load with power. An adjusting resistor 16 is connected in parallel with electric load via a relay 11 to consume a part of power. When the electric load increases and a high current flows, a current sensor 10 detects it, the contact of the relay 11 is turned ON via a relay 13, and the adjusting resistor 16 is separated, so that the power which has been consumed by the adjusting resistor 16 can be supplied to the electric load. When the number of revolutions lowers below a specified value, the contact of the relay 11 is turned ON via a relay 12 by the output from a rotation detector 5 to conduct the same operation.

Description

[Detailed description of the invention] [Industrial application field]

The present invention relates to a rotation stabilizing device for a generator engine, which keeps the rotational speed of an engine driving the generator stable even if the electrical load of the generator changes rapidly.

[Conventional technology]

For the engine that drives the generator, when the electrical load supplied from the generator becomes large and a large current is required, a large amount of power is required to turn the generator.
Rotation speed decreases. Conversely, if the electrical load becomes smaller and less current is required, less force is required to turn the generator, which increases the engine speed. However, in order to operate the engine efficiently, it is desirable to maintain the rotational speed suitable for the engine. Therefore, when the electrical load fluctuates as described above, it is necessary to meet the demands of the electrical load while also maintaining the rotational speed at a predetermined value. Conventionally, fluctuations in rotational speed due to electrical load are detected by a governor or the like, and the detected signal is used to control a carburetor, an injection pump, etc. to adjust the rotational speed. In addition, power is also supplied to a regulating load consisting of a water resistor with an electrode plate immersed in a water tank by branching from the power supply line from the generator to the electrical load, and the rotation speed is adjusted by this regulating load. It has also been proposed to
Publication No. 142). This operates the water pump according to fluctuations in the electrical load,
This is to adjust the water level of the water resistor. By adjusting the water level, the current flowing to the adjustment load is controlled and the attempt is made to respond to fluctuations in the electrical load.

[Problem N that the invention attempts to solve]

(Problem) However, the conventional technology described above has a problem in that when the electrical load fluctuates, it takes a long time for the rotation speed to stabilize to the original value. (Explanation of the problem) First, the carburetor and injection pump are controlled to stabilize the rotation speed to the original value, but with this method, the effect of the control operation becomes apparent only after there is a load fluctuation. There is a considerable time lag. The rotational speed continues to decrease until the control action takes effect, but because of the long time lag, the amount of decrease becomes large. Furthermore, if the rotational speed decreases significantly, the control signal that attempts to restore it will also become large, causing the original rotational speed to be greatly exceeded and an overshoot with a large amplitude to be repeated many times. This is also one of the reasons why it takes a long time to stabilize to the original rotational speed. When using a regulating load consisting of a water resistor, the speed at which electrical load fluctuations are compensated for is determined by the rate at which the resistance value of the water resistor changes. However, changing the resistance value of a water resistor is done by detecting load fluctuations, driving the water pump, and changing the water level, so the rate of change in resistance value depends on the response speed of the water pump. However, since the water supply is performed only after the mechanical mechanism inside the water pump is activated, the response speed is not very fast. Therefore, as in the previous example, there is a considerable time lag.
It still takes a long time to stabilize to the original rotation speed. An object of the present invention is to solve the above-mentioned problems.

[Means to solve the problem]

In order to solve the above problems, the present invention takes measures that can be used in combination with conventional control to quickly respond to changes in electrical load. That is, in the generator engine rotation stabilizing device of the present invention, power is branched from the power supply line from the generator to the electric load, and when the current to the electric load increases beyond a predetermined value or the engine rotation speed reaches a predetermined value. It was decided to include an adjustment resistor that stops the power supply when the power decreases below the value.

[For production]

When the electrical load increases and the engine speed begins to drop, the power supply to the adjustment resistor is stopped (this can be done instantly by operating a switch), so the current flowing there is stopped. It is immediately directed towards the electrical load. That is,
It becomes possible to instantaneously increase the current flowing to the electrical load, and it becomes possible to instantaneously respond to an increase in the electrical load. Therefore, the degree of decrease in engine speed is alleviated, and the engine speed can be stabilized to its original value within a short time.

【Example】

The present invention does not eliminate control operations using a carburetor or an injection pump, and although it also controls them, it proposes a device that performs instantaneous response, which is something they are not good at. Embodiments of the present invention will be described in detail below with reference to the drawings. FIG. 1 shows a rotation stabilizing device for a generator engine according to an embodiment of the present invention. In Fig. 1, 1 is a generator, 2 is an engine, 3 is a rotation detection gear, 4 is a connecting shaft, and 5 is a rotation detection gear.
is a rotation detection unit, 6 is an exhaust pipe, 7 is an exhaust heat exchanger, 8
is an engine cooling water heat exchanger, 9 is an engine cooling water pipe, 10 is a current detection unit, 11 is a normally closed relay, 12.13 is a normally open relay, I4 is a power supply, 15 is a resistance heat exchanger for adjustment,
16 is an adjustment resistor, 17 is a water supply pipe, 18 is a hot water supply pipe, and S is a rotation fluctuation instantaneous response section. The generator I is driven by the engine 2 via the connecting shaft 4 . Power is supplied from the generator 1 to an electrical load. A current detection unit 10 is provided in the middle of a power supply line to an electric load. The current detection signal is supplied to the normally open relay 13. Moreover, the power supply to the adjustment resistor 16 is performed by branching from the power supply line from the generator 1 to the electric load. A normally closed relay 11 is inserted in the middle of the power supply line to the adjustment resistor 16. Therefore, power is normally supplied to both the electrical load and the regulating resistor 16. A rotation detection gear 3 is attached to the connecting shaft 4, and a rotation detection section 5 detects the rotation. The rotation detection signal is supplied to the normally open relay 12. On the other hand, in order to effectively utilize the heat generated by the engine 2,
A water heater can be installed. The device from the water supply vibrator 17 to the hot water supply pipe 18 is a hot water supply device. The exhaust heat exchanger 7 warms water by using the exhaust heat of the engine passing through the exhaust vibro. The engine coolant heat exchanger 8 uses the heat of the engine coolant passing through the engine coolant pipe 9 to warm water. The Joule heat generated by the adjusting resistor 16 newly provided in the present invention can also be utilized in this water heater. The adjustment resistance heat exchanger 15 is provided for this purpose. Now, when the electrical load fluctuates, the rotation fluctuation instantaneous response section S
works like this: Suppose that the electrical load becomes large and a large current is required. Then, since the current detection unit 10 detects a current equal to or higher than the predetermined current, the normally open relay 13 is turned on. Therefore,
A current flows from the electric current a14 to the relay coil of the normally closed relay 11, and the normally closed relay 11 is turned off. When the normally closed relay 11 turns off, the adjustment resistor 1
The current that was being supplied to 6 will now flow towards the electrical load, responding to the increased electrical load. If you try to meet the demand for electrical load while continuing to energize the adjustment resistor 16, the total amount of current supplied from the generator 1 will have to be increased, which will cause the rotational speed of the engine 2 to decrease. cannot be avoided. However, if it is sufficient to cut off the current to the adjustment resistor 16 and distribute the current to the electrical load, the current supplied from the generator 1 does not need to be increased. Therefore, the load on the engine 2 does not increase at all. There is no drop in rotation speed. Even if that is not enough, the shortfall will naturally be small, but the decrease in rotational speed will be small. This current distribution can be instantaneously performed by turning off the normally closed relay 11, so there is no time lag and it is possible to respond quickly to load fluctuations. Although only one normally closed relay 11 is depicted in FIG. 1, the adjustment resistor 16 is made up of multiple resistors, each connected via a dedicated normally closed relay, to reduce the electrical load. The resistance value of the adjustment resistor 16 may be gradually changed according to the fluctuation of the time. In this way, the value of the current directed to the electrical load can also be adjusted in small increments. Moreover, it is also possible to use the adjustment resistor 16 as a variable resistor whose resistance value can be changed continuously. When the increased electrical load becomes smaller, the normally closed relay 11 can be turned on again. Note that a rotation detection section 5 that directly detects the rotation speed of the engine 2
A similar operation can also be performed using a detection signal from. That is, when the rotation speed falls below a predetermined value, the normally open relay 12 is turned on by a signal from the rotation detection section 5. Then, the normally closed relay 11 is turned off, and the current flowing through the adjustment resistor 16 is directed to the electrical load. The rotational fluctuation instantaneous response unit S operates in response to a signal from the rotation detection unit 5 or a signal from the current detection unit 10, whichever is faster. Therefore, normally, if the signal from either one is always fast, the other can be discarded. FIG. 2 is a diagram illustrating the operation of the apparatus shown in FIG. 1. The horizontal axis T represents time, and the vertical axis N represents the engine rotation speed. The solid line shows the conventional case, and the dotted line shows the case when the device of the present invention is used in combination. N is the rotational speed when the engine is operating stably. Assume that the electrical load increases at point A, and that a decrease in rotational speed is detected at point B. In the conventional case, control of the carburetor and injection pump is started at point B by a signal from the governor, but since there is a long time lag until the effect takes effect, the rotation speed drops significantly as shown by the solid line. After that, the rotation speed approaches the original value while repeatedly overshooting, but it becomes stable at point D, T.
It is. However, when the device of the present invention is used in combination, when the current detection section 10 or the rotation detection section 5 detects a decrease in the rotation speed at point B, the current to the adjustment resistor I6 is turned off, and the electric load is immediately turned off. current is increased. (Of course, control of the carburetor and injection pump is also started at the same time.) Therefore, the decrease in rotational speed is smaller than in the past. The rotational speed approaches the original value Q while repeatedly overshooting, and reaches the 0 point at point T. becomes stable. When the device of the present invention is used in combination, since the initial rotational speed decreases little, the time required for stabilization is quick, and time Tc is earlier than time T.

【Effect of the invention】

As described above, according to the present invention, in addition to controlling the carburetor and injection pump based on the conventional governor operation, it is possible to control the adjustment resistor that is branched from the power supply line to the electric load and is supplied with power. By stopping the power supply, the current to the electrical load is increased immediately, so it is possible to respond instantaneously to an increase in the electrical load. Therefore, the degree of decrease in rotation speed can be alleviated,
It is now possible to shorten the time it takes for the engine speed to stabilize to its original value.

[Brief explanation of the drawing]

Fig. 1: A rotation stabilizing device for a generator engine according to an embodiment of the present invention Fig. 2: In the same figure, 1 is a generator, and 2 is an engine. , 3 is a rotation detection gear,
4 is a connecting shaft, 5 is a rotation detection section, 6 is an exhaust pipe, 7 is an exhaust heat exchanger, 8 is an engine cooling water heat exchanger, 9 is an engine cooling water pipe, 10 is a current detection section, 11 is a normally closed relay , 12 and 13 are normally open relays, ] 4 is a power supply, 15 is an adjustment resistance heat exchanger, 16 is an adjustment resistance, 17 is a water supply pipe,
18 is a hot water supply pipe, and S is a rotation fluctuation instantaneous response section. Patent applicant: Isu＼Jidosha Co., Ltd. Representative Patent Attorney
Tomio Honjo

Claims (1)

[Claims] Power is branched from the power supply line from the generator to the electrical load, and
Stabilizing the rotation of an engine for a generator, characterized in that the power supply is stopped when the current to the electrical load increases beyond a predetermined value or when the engine speed decreases below a predetermined value. conversion device.