JPS6232335B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a portable generator having an alternating current generator;
This device relates to a control display device for portable equipment with engines such as pumps, compressors, chain saws, and lawn mowers, and can display information on the generated alternating current to inform the user and control the engine at the same time. Moreover, it is an object of the present invention to provide a control and display device that has a simple and compact configuration and is easy to put into practical use.

FIG. 1 is a perspective view of a portable generator employing a control display device according to the present invention, in which a generator main body 2 is fixed to a pipe frame 1. The generator main body 2 includes a generator 3, a fuel tank 4, a starter 5,
It has an engine (not shown), etc., and a control panel 6 is fixed to the frame 1 on the side of the generator main body 2. The control panel 6 is equipped with a DC output terminal 7, a DC circuit breaker 8, an AC output socket 9, an AC circuit breaker 10, a throttle knob 11, a pilot lamp 12, an engine stop switch 13, and a display liquid crystal panel 14. ing.

As shown in FIG. 2, which is an enlarged view of the liquid crystal panel 14, below the central liquid crystal display board 15 are an oil shortage warning lamp 16 and a fuel shortage warning lamp 1 from the left.
7. An overload warning lamp 18 and a button switch 19 for changing the display mode are arranged. Further, on the surface of the control panel 6 above the display board 15, characters 20 indicating various display modes are printed, and the instruction mark 21 in the display board 15 is printed with the characters 20.
It has come to be used as an instruction. Incidentally, the illustrated state shows that the AC voltage during power generation is 120 volts.

An electric circuit according to the conceptual diagram shown in FIG. 3 is incorporated into the above-mentioned portable generator. In FIG. 3, one end of the alternating current output winding 30 of the generator is connected to one connection terminal of the circuit breaker 10,
The other terminal of breaker 10 is connected to one output terminal of output socket 9. Also output winding 30
The other end is connected to the other output terminal of the output socket 9 via a current transformer 31. On the other hand, there is a branch between the output winding 30 and the breaker 10, and there is also a branch between the breaker 10 and the output socket 9, so that the voltage across the breaker 10 is input to the arithmetic circuit 32 (CPU) as an overload alarm signal. It's getting old. The overload warning signal is converted into a signal within the arithmetic circuit 32, and activates (lights up or flashes) the overload warning lamp 18, as well as flashes a display on the display board 15, which will be described later. Furthermore, breaker 1
0 winding 30 side end and socket 9 transformer 3
The voltage between the two ends is input to the arithmetic circuit 32 as AC voltage information and frequency information, and both pieces of information digitized in the circuit 32 are displayed as numbers on the liquid crystal display board 15 in the corresponding designation mode. The alternating current information detected as a current by the current transformer 31 is digitized in the arithmetic circuit 32 as an alternating current information display signal, and at the same time is converted into a control signal for the throttle control solenoid 33. The alternating current information display signal is displayed as a number on the liquid crystal display board 15 in the corresponding specified mode, and the control signal for the solenoid 33 is used to control the solenoid 33 of an electronically controlled governor as shown in FIG. . In FIG. 4, the throttle lever 34 is configured to be fully open at the solid line position and fully closed at the imaginary line position. Therefore lever 3
By rotating 4, the rotational speed of the engine can be freely changed. The tip of the lever 34 is connected to the governor case 36 via an iron core 35 in the middle.
(or a speed regulating lever for changing the rotation speed) is connected to a governor spring 37 whose one end is fixed to the
The tension of the spring 37 biases the tip of the lever 34 in the direction of arrow _X1 . The iron core 35 is surrounded by the solenoid 33 at intervals, and the rotation of the throttle lever 34 is controlled by biasing the iron core 35 in the reverse _X1 direction depending on the magnitude of the voltage applied to both ends of the solenoid 33. I am now able to control my movements. Here, the above solenoid 3
The control signal for No. 3 controls the magnitude of the voltage applied to the solenoid 33, and ultimately controls the engine speed. That is, when the load connected to the output socket 9 (Fig. 3) is normal, the governor shown in Fig. 4 performs its original governor function, thereby controlling the opening and closing of the throttle to keep the engine speed constant. However, when there is no load, a control signal converted by the arithmetic circuit 32 acts on the solenoid 33, turning the lever 34 to the fully closed side and putting the engine in an idling state.

Next, as shown in FIG. 3, both ends of the DC output winding 38 of the generator are connected to one output terminal of the output terminal 7 via forward diodes 39, 40 and a shunt 41 for double-wave rectification. It is connected.
Also, the center part of the output winding 38 is the circuit breaker 8.
It is connected to the other output terminal of the output terminal 7 via. On the other hand, the voltage across the circuit breaker 8 is sent to the arithmetic circuit 32 as an overload alarm signal.
The overload warning signal is converted into a signal within the arithmetic circuit 32 to activate the overload warning lamp 18 and cause the display on the display board 15 to blink. Furthermore, the voltage between the center part of the winding 38 and the terminal 7 on the shunt 41 side is digitized as DC voltage information in the arithmetic circuit 32, and is displayed as a number on the liquid crystal display board 15 in the DC voltage mode, as well as as a DC constant voltage. It is used as a power source for the arithmetic circuit 32, solenoid 33, etc. A small amount of direct current shunted by the shunt 41 is inputted as direct current information to the arithmetic circuit 32, digitized, and displayed as a number on the display board 15.

On the other hand, a signal from a fuel shortage sensor in the fuel tank is input to the arithmetic circuit 32 as a fuel shortage alarm. The duration of the signal is counted in the circuit 32, and when the signal continues for 10 seconds, for example, the signal is converted and the fuel shortage warning lamp 17 is activated and the display on the display board 15 is made to blink. Further, a signal from an engine oil shortage sensor provided in the oil pan of the engine is input to the arithmetic circuit 32 as an oil shortage alarm. The arithmetic circuit 32 is configured to count the duration of the signal, and if the signal indicating an oil shortage continues for, for example, two seconds, the information is processed as follows. That is, the oil shortage signal is converted to activate the oil shortage alarm lamp 16, and at the same time, the signal is converted into text and displayed on the liquid crystal display panel 15 as, for example, "OIL." Furthermore, the engine's primary ignition circuit is grounded in response to the oil shortage signal, and the engine is automatically stopped. Note that the above-mentioned "OIL" display is forcibly displayed on the display board 15 regardless of the instruction mode display.

Next, the action will be explained. When the generator shown in Fig. 1 is started, the LCD display 15 shows 0 as shown in Fig. 2.
The numbers ~9999 will be displayed and the characters 2 will appear at the top.
An instruction mark 21 pointing to 0 is displayed. Second
The state shown in the figure shows that the AC voltage being generated is 120 volts. This is the AC voltage information obtained from the output of the AC output winding 30 in FIG. Here, by pressing the button switch 19 shown in FIG. 2, the display mode can be changed. That is, each time the switch 19 is pressed,
Each piece of information digitized within the arithmetic circuit 32 of FIG. 3 is selected by a display control circuit incorporated within the circuit 32. Among the modes shown in Figure 2, from the left, AC voltage information, AC current information, DC voltage information, DC current information, and AC frequency information are 1.
They are displayed one after another on the display board 15, and finally return to the AC voltage display mode via a preliminary mode. The indication mark 21 changes its display position along the upper side of the display board as the mode changes, and informs the user what information the currently displayed number means.

On the other hand, if an overload occurs and circuit breaker 10 or breaker 8 in Fig. 3 is opened, an overload alarm signal (mild warning information) is sent to the arithmetic circuit due to the potential difference that occurs between the two terminals of breakers 8 and 10. 32, the signal is converted and the overload warning lamp 18 is turned on (or blinks), and it also works on the display control circuit in the circuit 32 to blink the display on the display board 15, giving the user a mild warning. Notify the user of the occurrence of an abnormality and make them understand that the abnormality is due to overload.

When a fuel shortage signal (mild warning information) is input from the fuel shortage sensor to the arithmetic circuit 32, the signal duration is first counted in the circuit 32.
For example, when the signal duration reaches 10 seconds,
The signal is converted and the fuel shortage warning lamp 17 is lit (or blinked), and the numbers displayed on the display board 15 are made to blink, thereby informing the user of the occurrence of fuel shortage. In this case, the alarm lamp 1 must be activated after the signal duration has been counted and the signal has continued for a predetermined time.
7 etc. is not activated, so there is no inconvenience such as a simple fluctuation in the fuel level causing an alarm to be issued.

Also, when an engine oil shortage signal (severe warning information) is input from the oil shortage sensor to the arithmetic circuit 32, the signal duration is counted first. In this case, the predetermined duration time is set to 2 seconds, for example, and when the signal continues for 2 seconds, the signal is converted and the oil shortage warning lamp 16 lights up (or flashes), and the display control circuit in the calculation circuit 32 is activated. The normal information mentioned above is erased from the display board 15 and the words "OIL" are displayed instead. In this case, the engine is further stopped by grounding the engine's primary ignition circuit.

On the other hand, the alternating current information detected by the current transformer 31 is digitized in the arithmetic circuit 32 for display on the display board 15, and
The signal is converted into a current for operating the solenoid 33. Here, for example, when a device (for example, an electric drill, an electric planer, etc.) connected to the output socket 9 is in a stopped state and the load is zero, the current detected by the current transformer 31 is zero. At this time, the current flowing through the solenoid 33 in _FIG . It rotates to the fully closed position and the engine becomes idling. Next, when a load is applied by operating an electric drill or the like, the current transformer 31 shown in FIG. . At the same time, this current information is converted into a signal, and the electronically controlled governor shown in FIG. 4 restores the original governor function, that is, the function of controlling the opening and closing of the throttle to maintain constant engine rotation.

As explained above, according to the present invention, there is provided an arithmetic circuit 32 which detects the output from an alternating current generator (of which the alternating current output winding 30 is a part) and inputs it as alternating current information using a current transformer 31. The throttle control has a display device (for example, a display liquid crystal panel 14) that displays the alternating current information digitized in the arithmetic circuit 32 as a load current value, and is operated by the alternating current information converted in the arithmetic circuit 32. Since the engine has a solenoid 33, the alternating current information obtained by the current transformer 31 can be displayed and notified to the user, and at the same time, the engine can be controlled based on the alternating current information, and the configuration is simple. Moreover, there is an advantage that a control display device that is compact and easy to put into practical use can be obtained. In addition, in the case of portable devices, the display device must be made as small as possible due to space constraints, but in the present invention, a display board that displays numbers and instruction marks, and an edge of the display board near this display board are provided. Characters representing "AC voltage,""ACcurrent," and "frequency" are arranged along the line, and a button switch for changing the display mode is provided.By operating the button switch for changing the display mode, the display board can change the display. Since the display device is configured such that the displayed numbers are sequentially switched to AC voltage values, AC current values, and frequencies, and the indication mark moves to the vicinity of the characters corresponding to the information currently displayed, 1. Since multiple pieces of information can be switched and displayed on a single display board, the display can be enlarged, and the display is a digital display with numbers, and furthermore, the indicator mark indicates the display content by indicating characters such as "AC voltage". Even with a small display device, extremely clear, easy-to-understand, and highly accurate display can be performed. Also, since only numbers and instruction marks are displayed on the display board,
By printing and pasting characters representing "AC voltage" etc. on a label, for example, even if the language differs depending on the country, it can be handled by simply changing the label, and the display device other than the label can be completely shared without changing anything. can.

On the other hand, according to the above embodiment, a plurality of pieces of normal information can be easily displayed even on equipment such as a portable generator with little display space, and warning information in the event of a malfunction in the operating state can be displayed. By changing the display form depending on the importance of the warning information, there is an advantage that even a user without prior knowledge can easily know the degree of importance of a malfunction.

In carrying out the present invention, the direct current information shunted by the shunt 41 in FIG. 3 may not only be used for display purposes, but may also be used for controlling the solenoid 33 in the same way as the alternating current information. . Further, there is no need to provide a circuit for grounding the ignition primary circuit when oil is insufficient. The warning information is not limited to an overload warning or the like, but may also include, for example, an air purifier clogging warning, an engine overheat warning, and the like. The display device is not limited to the liquid crystal panel 14, and for example, a light emitting diode may be used. If the device has a circuit that stops the engine by grounding the primary ignition circuit, it may be possible to incorporate a battery in advance and use the battery as a display power source after the engine is stopped.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of a portable generator employing the control display device according to the present invention, FIG. 2 is a front view of the vicinity of the liquid crystal panel, FIG. 3 is a conceptual diagram of the control display device according to the present invention, and FIG. 4 is a schematic diagram of an electronically controlled governor. 14...display liquid crystal panel (an example of a display device),
30... AC output winding (part of the AC generator), 31... Current transformer, 32... Arithmetic circuit, 33... Throttle control solenoid.

Claims (1)

[Scope of Claims] 1. A control display device for a portable device with an engine having an AC generator, comprising: a current transformer that detects the output current of the AC generator; and an AC generator that detects the output current of the AC generator; an arithmetic circuit into which voltage information and alternating current information corresponding to the detected current of the current transformer are input; a throttle control solenoid operated by the alternating current information converted by the arithmetic circuit; and the alternating current voltage information and the alternating current. a display device that digitally displays an output voltage, an output current, and a frequency of the AC power generator calculated by the arithmetic circuit based on the information, and the display device displays numbers and instruction marks; a display board, characters representing "AC voltage", "AC current", and "frequency" arranged near the display board along the edge of the display board, and a button switch for changing the display mode; By operating the change button switch, the numbers displayed on the display board are sequentially switched to AC voltage value, AC current value, and frequency, and the instruction mark changes to the character corresponding to the information currently displayed. 1. A control display device for a portable device with an engine, characterized in that the device is configured to move near the engine. 2. The throttle control solenoid is characterized by the adoption of a throttle control solenoid that controls the opening and closing of the throttle to maintain a constant rotation of the engine during normal loads, and fully closes the throttle to perform idling operation during no-load conditions. A control display device for a portable device with an engine according to claim 1.