JPS6143242A - Ac generating device with engine - Google Patents

Abstract

PURPOSE:To facilitate work regulating a frequency and enable the frequency, after it is set, to ensure the stability, by providing a frequency setter circuit which changes the set frequency of an AC generator by the level change of a frequency setting voltage signal given to a control circuit. CONSTITUTION:When a frequency selector switch 27 is placed in an off-condition, high voltage is supplied to a control circuit 26 by voltage input from an input terminal 21, and the circuit 26, deciding a set frequency to be set to 50Hz and calculating the set frequency as 50Hz, outputs a control value corresponding to a driver circuit 38. While if the frequency selector switch 27 is switched to be turned on, the circuit 26, to which low voltage is supplied because the voltage from the input terminal 21 is relieved through the frequency selector switch 27, decides the set frequency to be set to 60Hz and calculated as 60Hz, outputting a control value corresponding to the driver circuit 38. In this way, an engine 41 controls a generator 31 generating an assigned set frequency.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an engine-equipped alternating current generator capable of changing the frequency of output voltage.

(Conventional technology) For example, a configuration as shown in FIG. 5 is known.

In FIG. 5, one end of a governor lever 14 that rotates around a governor shaft 13 connected to a governor length mechanism inside the engine is connected to a throttle valve 12 mounted on a carburetor 11. The end is connected to an adjustment lever 16 via a tensioned spring 15. The adjustment lever 16 is rotatable around a support shaft 17 at its lower end, and a freely adjustable adjustment bolt 18 is in contact with the upper end of the adjustment lever 16.

In the above configuration, when changing the set frequency of the generator, the adjustment bolt 18 is rotated to change the amount of protrusion toward the C11 node lever 16 side, and the tension of the spring 15 is changed. Also, if a large change in the set frequency is required, this can be done by replacing the turn spring 15 itself.

- In countries where power is being used, there are areas where the frequency of supplied power is 50Hz and 60Hz.
Hz, and it is desired that engine-equipped power generators be able to easily switch between frequency ranges.

However, in the conventional configuration described above, in order to switch the set frequency, it is necessary to manually make delicate adjustments to the tension of the spring 15 by rotating the adjustment bolt 18, and it is necessary to manually adjust the tension of the spring 15 by rotating the adjustment bolt 18.
When switching between 0 Hz and 60 Hz, it is not easy to set a predetermined frequency. Furthermore, it is difficult to ensure sufficient frequency stability after setting.

(Problems to be Solved by the Invention) The conventional configuration described above has the disadvantage that delicate manual adjustment is required when changing the set frequency, making the adjustment work difficult. Further, the above configuration has the problem that it is difficult to match the frequency of the output voltage to a predetermined set frequency, and furthermore, the set frequency is likely to fluctuate after setting.

The present invention aims to solve the above problems.

(Means for Solving the Problems) The present invention has an alternator driven by an engine, inputs an output frequency signal from the alternator to a III control circuit, and controls the engine according to changes in the frequency signal. Changing the set frequency of the alternator in an engine-equipped alternating current generator that changes the rotation speed control signal and controls the engine speed to a constant rotation speed corresponding to the set frequency of the alternator using the engine speed control signal. This alternating current generator with an engine is characterized in that a frequency setting circuit is connected to the control circuit to change the level of a frequency setting voltage signal applied to the 11W circuit.

(Embodiment) A frequency setting circuit 20, which is a main component of the present invention, is formed as shown in FIG. 1, for example. In FIG. 1, DC power supply voltage is input to two input terminals 21 and 22, respectively.

One input terminal 21 has a resistor 23, 24 and a protection IC 2.
5 to a predetermined input terminal of a control circuit 26 (microcomputer). Further, one end of the frequency changeover switch 27 is connected to a branch between the resistors 23 and 24, and the other end of the frequency changeover switch 27 is grounded. Furthermore, resistance 23
．． 24 is branched and grounded via a protection diode 28 in the opposite direction. - The sumo wrestler input terminal 22 is connected between the resistors 23 and 24 via the reverse protection diode 29.

The frequency setting circuit 20 has a control l1 as shown in FIG.
incorporated into m. In FIG. 2, the output voltage from an alternator 31 provided in an engine-equipped alternating current generator (described later) is input to a waveform shaper 36, and the waveform shaper 36
The waveform is shaped into a rectangular wave and converted into a waveform suitable for digital control. The output from the waveform shaper 36 is input to the control circuit 26. The control circuit 26 calculates the deviation from the set frequency specified by the frequency setting circuit 20, the frequency change rate, etc. based on the input signal, and further sends a control value to the drive circuit 38 based on the calculation results. It is set to be sent. The control circuit 26 determines the specified set frequency based on the level (high/low) of the voltage (frequency setting voltage signal) input from the frequency setting circuit 20. For example, when the input voltage is high, the set frequency is set to 50H2. When the frequency is low, it is determined to be 60 Hz.The drive circuit 38 converts the signal given from the control circuit 26 into a signal suitable for driving the drive mechanism 39. The mechanism 39 controls the engine 41 by rotating a throttle valve 40 as described later.

The drive mechanism 39 is formed from a DC solenoid or a pulse motor, and has a configuration as shown in FIG. 3, for example. In FIG. 3, a throttle valve 40 arranged in an intake passage 43 of a carburetor 42 has a disc-shaped valve body 4.
4, and a vertical rotating shaft 45 that clamps and fixes the pulp body 44 in a diametrical orientation. Rotating shaft 4
5 protrudes upward through the wall of the carburetor 42, and the protruding portion of the rotating shaft 45 also serves as the central rotating shaft of the rotary solenoid 46. The case of the rotary solenoid 46 is fixed to the upper end surface of the carburetor 42 by screws 47. Further, the rotary solenoid 46 is capable of rotating the rotating shaft 45 by a predetermined angle in response to changes in the input voltage.

The above control mechanism is installed, for example, in an engine generator as shown in FIG. In FIG. 4, an alternating current generator 31 is connected to an engine 41 so as to be directly driven. It is fixed via 33. A fuel tank 34 is fixed to the upper part of the pipe frame 32, and an operation panel 35 is attached to the upper front half of the pipe frame 32.

Next, the operation will be explained. When the engine 41 starts, the AC power generator 131 is driven by the engine 41 and power generation is started. The electric power generated by the alternating current generator 31 is taken out from the output terminal 48 provided at the operation W35 in Fig. M4, and is used as electric power for various machines. The voltage generated by the alternating current generator 31 is input to the waveform shaper 36 (FIG. 2) as a signal for controlling the rotation speed of the engine 41. Waveform shaper 36
Then, the input voltage change is shaped into a rectangular wave for digital control and output to the control circuit 26. The control circuit 26 sets the set frequency (501-17 or 60 Hz) specified by the frequency setting circuit 20 based on the input signal.
The deviation with respect to the drive circuit, frequency change rate, etc. are calculated, and a control value is sent to the drive circuit 38 based on the calculation results. Drive circuit 38
Then, the signal given from the control circuit 26 is converted into a signal suitable for driving the rotary solenoid 46 (FIG. 3). Rotary solenoid 46 is driven by a voltage signal from drive circuit 38 .

When a voltage is input to the rotary solenoid 46 in FIG. 3, the rotating shaft 45 rotates by a predetermined angle in accordance with the magnitude of the voltage. Due to this rotation, the valve body 44 also rotates together, and the throttle valve 40 is opened and closed.

By changing the degree of opening and closing of the throttle valve 40, the fourth
The rotation speed of the engine 41 is maintained at a predetermined value so that the output of the predetermined value is obtained from the AC generator 31 shown in the figure.

Here, when the frequency changeover switch 27 in FIG. determines that the set frequency is set to 501-1z.

Therefore, the control circuit 26 performs calculations assuming that the set frequency is 50 Hz, and outputs a corresponding control value to the drive circuit 38 in FIG. As a result, the engine 41 generates electricity t13
1 is controlled to generate 50H2 of power. On the other hand, when the frequency changeover switch 27 is turned on, the voltage from the input terminal 21 escapes through the frequency changeover switch 27, so that a low voltage is supplied to the control circuit 26, and the control circuit 26 operates at the set frequency. is set to 60H7. As a result, the control circuit 26 performs calculations assuming that the set frequency is 60Hz, and the drive circuit 3
Output the control value corresponding to 8. As a result, the engine 41 is controlled so that the power generation l131 is 60)1z.

This switching of the switch 27 can be performed not only before the start of operation, but also during operation.

(Effect of the invention) It has an AC power generator 1131 driven by the engine 41, and the output frequency signal from the AC power generator 1131 is transmitted to the control circuit 2.
6, the engine speed control signal is changed according to the change in the frequency signal, and the engine speed control signal is used to control the speed of the engine 41 to a constant speed corresponding to the set frequency of the alternator 31. In the engine-equipped alternating current generator, a frequency setting circuit 20 is connected to the control circuit 26 for changing the set frequency of the alternator 31 according to a level change of a frequency setting voltage signal applied to the open control circuit 26. Therefore: (a) Since the set frequency is changed by changing the level of the frequency setting voltage signal applied to the control circuit 26, delicate manual adjustments are no longer necessary, and the adjustment work is extremely easy.

(b) Even when switching the set frequency, it is easy to match the frequency of the output voltage to the predetermined set frequency.

(C) There is no problem that the set frequency fluctuates after the frequency is set.

(d) Mechanically operated frequency setting mechanisms such as springs and adjustment bolts are not required, improving durability.

(Another embodiment) The setting frequency in the control circuit 26 is determined to be 60H2 when the frequency selector switch 27 is ON, and OF,
The frequency may be set to 50 Hz when the frequency is F. Further, the set frequency is not limited to 50H2 and 60Hz, and by setting the control circuit 26 in advance to control to two arbitrary types of frequencies, the set frequency can be controlled to a desired set frequency as appropriate.

[Brief explanation of the drawing]

Fig. 1 is a circuit diagram of the frequency setting circuit portion of the engine-equipped AC generator according to the present invention, Fig. 2 is a block diagram of the control mechanism, Fig. 3 is a perspective partial view of the throttle valve portion, and Fig. 4 is the engine-equipped AC generator. FIG. 5, a partially cutaway front view of the power generator, corresponds to FIG. 4 of the conventional structure. 20... Frequency setting circuit, 26... Control circuit, 31... Alternator, 41... Engine patent applicant Kawasaki Heavy Industries, Ltd. Figure 1-2'l Figure 4

Claims (1)

[Claims] It has an alternator driven by an engine, inputs an output frequency signal from the alternator to a control circuit, and changes an engine rotation speed control signal according to changes in the frequency signal,
In an engine-equipped alternating current generator that controls the engine rotation speed to a constant rotation speed corresponding to the set frequency of the alternator using an engine rotation speed control signal, frequency setting is applied to the control circuit to change the set frequency of the alternator. An alternating current generator with an engine, characterized in that a frequency setting circuit for controlling the frequency setting by changing the level of a voltage signal is connected to the control circuit.