JP2000092896A - Generating set driven by internal combustion engine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent an internal combustion engine from shortening its life time and failing owing to its revolution speed exceeding the upper-limit value of a tolerable scope when the load of a generator driven by it is increased. SOLUTION: This generating set has a revolution speed deviation computing means 11 for computing as a revolution speed deviation the deviation of the revolution speed of an internal combustion engine 1 from its targeted revolution speed, an operation amount computing means 12 for computing the operation amount of a fuel-feeding-quantity adjusting portion which is required to hold the revolution speed deviation within a tolerable scope, and a driving circuit 6 for so giving the driving current to an actuator 5 as to operate the fuel- feeding-quantity adjusting portion only by the computed operation amount. Further, a computing means 16 for computing the necessary targeted revolution speed of the engine 1 for holding the deviation of the output voltage of a generator 2 from its targeted output voltage within a tolerable scope is provided to give the computed targeted revolution speed to the revolution speed deviation computing means 11.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an internal combustion engine-driven power generator for driving a generator by an internal combustion engine to supply power to a load.

[0002]

2. Description of the Related Art An internal combustion engine-driven power generator includes an internal combustion engine,
It comprises a generator driven by the internal combustion engine and a control device for controlling the rotation speed [rpm] of the internal combustion engine according to the load of the generator.

[0003] As a conventional power generator of this type, there is known a power generator in which the engine speed is controlled so that the output voltage of the generator is maintained at a target value.

In this type of power generator, a flywheel is attached to one end of an output shaft of the internal combustion engine, and a generator is attached to the other end of the output shaft, and the internal combustion engine is used exclusively for driving the generator. Although there were many,
As shown in No. 75, a magnet rotor is constructed by attaching a magnet field inside a flywheel attached to one end of an output shaft of an engine, and a stator is arranged inside the flywheel. There has also been proposed a device in which an electric load is driven by a magnet type generator constituted by the magnet rotor and the stator. With this configuration,
Since another load can be connected to the other end of the output shaft of the engine, the output of the internal combustion engine can be used to drive a load other than the generator.

[0005]

In a conventional internal combustion engine drive generator, the number of revolutions of the internal combustion engine is controlled so as to maintain the output voltage of the generator at a target value. In addition, the engine speed may exceed the upper limit of the permissible range, thereby shortening the life of the engine or causing a failure.

In the conventional internal combustion engine driven generator, the number of revolutions of the internal combustion engine is controlled so as to maintain the output voltage of the generator at a target value. Therefore, a magnet type generator is attached to one end of the output shaft of the engine. Therefore, when an external load is attached to the other end of the output shaft, the rotation speed of the engine fluctuates with the fluctuation of the load current of the generator, which sometimes hinders the operation of the external load.

[0007] One object of the present invention is to control the output voltage of a generator to a target value so that the rotational speed of the internal combustion engine exceeds the upper limit of an allowable range and the life of the engine is shortened. An object of the present invention is to provide an internal combustion engine driven power generation device capable of preventing failure.

Another object of the present invention is to provide an internal combustion engine driven power generator capable of driving a load other than the generator without any trouble by the output of the internal combustion engine driving the generator. is there.

[0009]

SUMMARY OF THE INVENTION The present invention comprises an internal combustion engine,
The present invention is directed to an internal combustion engine driven generator including a magnet generator driven by the internal combustion engine, and a control device for controlling the internal combustion engine so as to maintain the output voltage of the magnet generator at a set value.

In this type of conventional power generator, a voltage control loop for detecting the output voltage of the generator and controlling the deviation between the detected output voltage and the target output voltage to zero or to a value less than an allowable range. However, in the present invention, a rotational speed control loop for controlling the deviation between the rotational speed of the internal combustion engine and the target rotational speed to be zero or to be kept within an allowable range is provided, and the output of the generator is Means for calculating, as a voltage control target rotation speed, a target rotation speed of the engine required to reduce the deviation between the voltage and the target output voltage to zero or to keep the deviation below an allowable range; Is set as a target rotation speed of the control loop.

Therefore, in the present invention, the control device includes an actuator for operating a fuel supply amount adjusting section of the internal combustion engine in accordance with the applied drive current, a rotational speed detecting means for detecting a rotational speed of the internal combustion engine, Voltage detecting means for detecting an output voltage of the generator, voltage setting means for setting a target output voltage of the generator, and a deviation between the output voltage detected by the voltage detecting means and a target output voltage set by the voltage setting means. Target speed calculation means for calculating the rotation speed of the internal combustion engine required to reduce the pressure to zero or below the allowable range as a target rotation speed for voltage control, and the rotation speed of the internal combustion engine detected by the rotation speed detection means Speed deviation calculating means for calculating a difference between the rotation speed deviation and the target speed for voltage control as a rotation speed deviation, and a fuel supply necessary to reduce the rotation speed deviation to zero or to a value less than an allowable range. Operating amount calculating means for calculating the operating amount of the adjusting unit, and a drive circuit for providing a drive current to the actuator so as to operate the fuel supply amount adjusting unit by the operating amount calculated by the operating amount calculating means, The target rotation speed calculating means is configured to limit the target rotation speed to an upper limit value of an allowable range of the rotation speed of the internal combustion engine.

With the above-described configuration, when the load on the generator is increased, it is possible to prevent the engine speed from rising beyond an allowable range. It is possible to prevent the number from being excessively increased and shortening the life of the engine or causing the engine to fail.

[0013] The present invention is also applied to an internal combustion engine driven power generator in which an external load connecting portion for connecting an external load other than the generator to the output shaft of the internal combustion engine is provided.

When an external load connecting portion for connecting an external load other than the generator to the output shaft of the internal combustion engine is provided,
A control device for controlling the internal combustion engine so as to maintain the output voltage of the generator at a set value, in addition to the above-described components, a rotation for setting a target rotation speed for an external load that gives a target rotation speed of an external load connection portion. Number setting means, and using the target rotation speed calculated by the target rotation speed calculation means as a target rotation speed for voltage control, setting one of the target rotation speed for voltage control and the target rotation speed for external load to the target rotation speed of the internal combustion engine. Target speed selection means for selecting the target rotation speed.

In this case, the rotational speed deviation calculating section calculates a difference between the rotational speed of the internal combustion engine detected by the rotational speed detecting means and the target rotational speed selected by the target rotational speed selecting means as a rotational speed deviation.

With this configuration, when the external load is driven by the internal combustion engine, the external load can be operated without any trouble by selecting the target rotational speed for the external load as the target rotational speed of the engine. When the generator is driven by the internal combustion engine, the deviation between the output voltage of the generator and the target output voltage is set within an allowable range by selecting the target rotation speed for voltage control as the target rotation speed of the engine. Can be controlled.

In the internal combustion engine driven power generator according to the present invention, the engine is operated by connecting only the load of the generator without connecting the external load to the engine, and the power generation is performed by connecting the external load to the engine. Basically, there are two ways to operate the engine without connecting a load to the machine, but when the external load always operates at a constant speed, or when the speed of the external load fluctuates. When the range is limited, an external load may be connected to the engine, and the engine may be operated with the load connected to the generator.

The target rotation speed selecting means may be configured to select either the voltage control target rotation speed or the external load target rotation speed as the engine target rotation speed by using a manually operated switch. Preferably, an external load detection unit that detects whether an external load is connected to the external load connection unit of the internal combustion engine, and a generator load detection unit that detects whether a load is connected to the generator In addition, the target rotation speed may be automatically selected according to the presence or absence of an external load or the state of the load of the generator.

In this case, the target speed selection means can have various configurations according to the characteristics of the external load connected to the engine, the fluctuation range allowed for the output voltage of the generator, and the like.

For example, a generator load detecting means for detecting whether a load is connected to the generator is provided, and the generator load detecting means detects that the load of the generator is connected. When the target speed for voltage control is selected, and the target load for external load is selected when the load of the generator is not connected by the generator load detection means, the target speed for external load is selected. Selection means can be configured.

With the above configuration, when a load is connected to the generator, the engine speed can be controlled so that the output voltage of the generator is maintained at the target output voltage, and the load is connected to the generator. If not, control can be performed to maintain the engine speed at a speed suitable for driving an external load.

An external load detecting means for detecting whether or not an external load is connected to the internal combustion engine is provided. When the external load detecting means detects that no external load is connected, a voltage control means is provided. It is also possible to select the target rotational speed and select the external load target rotational speed when the external load detecting means detects that the external load is connected.

With the above configuration, the engine speed can be controlled so that the output voltage of the generator is maintained at the target output voltage when no external load is connected to the internal combustion engine. When a load is connected, the engine speed can be controlled so as to maintain the engine speed at a speed suitable for driving an external load.

The target rotation speed selecting means detects when the generator load detecting means detects that the load of the generator is not connected and when the external load detecting means detects that the external load is connected, When the external load target rotation speed is selected, the generator load detecting means detects that the load of the generator is connected, and the external load detecting means detects that the external load is not connected. The target speed for voltage control and the target speed for voltage control and the target speed for voltage control are detected when both the connection of the external load and the connection of the generator load are detected. It can be configured to select one predetermined target rotation speed among the numbers.

With this configuration, when a load is connected to the generator while no external load is connected to the engine, control is performed so that the deviation between the output voltage of the generator and the target output voltage falls within an allowable range. When an external load is connected to the engine while the generator load is not connected, it is possible to control the deviation between the rotation speed of the external load and the target rotation speed to be within an allowable range. it can. Further, when an external load is connected to the engine while the load is connected to the generator, the output voltage is controlled so that either the generator or the external load is properly operated according to a predetermined priority. Control or control of the number of revolutions can be performed.

As the generator load detecting means, for example, a load current detector for detecting a load current of the generator can be used. Further, the generator load detecting means may be constituted by a sensor such as a proximity switch for detecting the presence or absence of a load connected to the generator.

As the external load detecting means, a sensor such as a proximity switch for detecting the presence or absence of an external load connected to the external load connecting portion of the output shaft of the engine can be used. Further, when the external load is connected to the output shaft of the engine via the electromagnetic clutch, the external load detecting means is configured to detect whether or not the external load is connected by turning on / off a switch for operating the electromagnetic clutch. Can also.

When the generator load detecting means detects that the load of the generator is not connected, and when the external load detecting means detects that the external load is connected, the target rotation speed selecting means also performs the operation. When the target rotation speed for the external load is selected, the generator load detection means detects that the load of the generator is connected, and when the external load detection means detects that the external load is not connected, the voltage is detected. The control target speed is selected, and both the connection of the external load and the connection of the load of the generator are detected, and the output voltage of the generator and the target voltage detected by the voltage detection means are detected. When the deviation from the output voltage is within the set range, select the target rotation speed for external load, and make sure that the external load is connected and the generator load is connected. When the deviation between the output voltage of the generator detected by the voltage detection means and the target output voltage exceeds a set range, the target speed for voltage control is selected. You can also.

With this configuration, when an external load is connected to the engine and a load is connected to the generator, the deviation between the output voltage of the generator and the target output voltage is set within an allowable range. The rotation speed of the external load can be controlled to the extent possible by giving priority to the reduction.

The target rotation speed selecting means also detects when the generator load detecting means detects that the load of the generator is not connected and the external load detecting means detects that the external load is connected. When the external load target rotation speed is selected, the generator load detecting means detects that the generator load is connected, and the external load detecting means detects that no external load is connected. The target speed for voltage control is selected, and both the connection of the external load and the connection of the load of the generator are detected, and the rotation speed of the internal combustion engine detected by the rotation speed detection means. When the deviation between the target speed for the external load and the target speed for the external load is within the set range, the target speed for the voltage control is selected, and that the external load is connected and the load of the generator is connected. When the deviation between the rotation speed of the internal combustion engine detected by the rotation speed detection means and the target rotation speed for external load exceeds a set range, the target rotation speed for external load is determined. It can also be configured to select.

With this configuration, when the external load is connected to the engine and the load is connected to the generator, the deviation between the rotation speed of the external load and the target rotation speed is set within an allowable range. The output voltage of the generator can be controlled to the extent possible, giving priority to the reduction.

As means for detecting the load on the generator,
When using the load current detection means for detecting the load current of the generator, the target rotation speed selection means, it is detected by the load current detection means that no load current is flowing to the generator,
When the external load detecting means detects that the external load is connected, the external load target rotation speed is selected,
When the load current detecting means detects that a load current is flowing through the generator, and when the external load detecting means detects that no external load is connected, the target speed for voltage control is selected and the external load is selected. Is connected to the generator and that the load current is flowing through the generator, and when the load current detected by the load current detector is within the set range, the target rotational speed for the external load is used. Is selected, when both the external load is connected and the load current is flowing through the generator are detected, and the load current detected by the load current detector is out of the set range. It is also possible to configure so as to select the target speed for voltage control.

With this configuration, when an external load is connected to the engine and the load is connected to the generator, priority is given to keeping the load current of the generator within a predetermined range. The control of the output voltage of the machine and the control of the rotation speed of the engine can be performed.

[0034]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a block diagram showing the overall configuration of an internal combustion engine driven generator according to the present invention.
In FIG. 1, reference numeral 1 denotes an internal combustion engine, and a magnet generator 2 is attached to one end of an output shaft of the internal combustion engine. The magnet type generator 2 includes a flywheel magnet rotor attached to the output shaft of the engine, and a stator fixed to the case or cover of the engine. Occurs. An electric load 3 is connected to a generating coil of the magnet type generator 2.

The other end of the output shaft of the internal combustion engine 1 is an external load connection, to which an external load 4 is connected as required.

Reference numeral 5 denotes an actuator for operating a fuel supply amount adjusting unit for adjusting the supply amount of fuel to the internal combustion engine 1.
The actuator 5 is configured to operate the fuel supply amount adjustment unit by using an electric motor or an electromagnet as a drive source, and operates the fuel supply amount adjustment unit by an operation amount corresponding to the magnitude of the drive current supplied from the drive circuit 6. .

Reference numeral 7 denotes the rotation speed of the output shaft of the internal combustion engine 1 [r
pm] and a signal (voltage signal) V proportional to the number of revolutions
The signal VN is input to a differentiator 8, and the output of the differentiator 8 and the output signal of a rotation number detector 7 are input to an adder 9. The adder 9 outputs a signal VN + Vd which is the sum of a signal VN proportional to the engine speed and a signal Vd = Kd (dVN / dt) (Kd is a differential control constant) obtained by differentiating the signal VN with time. It is output as a rotation speed detection signal. In this example, a rotation speed detector 7 and a differentiator 8
And the adder 9 constitute a rotation speed detecting means 10.

The rotation speed detector 7 may be of any type as long as it generates a voltage signal having a magnitude proportional to the rotation speed of the engine. The rotation speed detector 7 is mounted on the output shaft of the engine. Each time a frequency generator (a generator that generates a voltage having a magnitude proportional to the number of revolutions of the engine) or an ignition device 2 for an internal combustion engine performs an ignition operation, a pulse-shaped pulse is induced in a primary coil of an ignition coil of the ignition device. A frequency / voltage converter that converts the frequency of the voltage to a voltage signal and generates a voltage signal proportional to the engine speed can be used. When a signal generator for generating a pulse signal at a specific rotation angle position of the engine is mounted on the engine to control the ignition position of the ignition device for the internal combustion engine, the signal generator and the signal generator The frequency detector 7 can be configured by a frequency / voltage converter that converts the frequency of the pulse signal output from the generator into a voltage signal. Further, the voltage induced in the power generation coil in the magnet type generator 2 can be used as a signal proportional to the engine speed.

The rotation speed detection signal VN + Vd generated by the rotation speed detection means 10 is input to the rotation speed deviation calculating means 11 together with a target rotation speed signal VN0 for giving a target rotation speed of the internal combustion engine. The rotation speed deviation calculating means 11 calculates the difference between the rotation speed detection signal VN + Vd and the target rotation speed signal VNO,
A rotation speed deviation signal VNd (= VN + Vd-VN0) for giving a deviation (rotational speed deviation) between the engine speed and the target speed is output. The rotational speed deviation signal VNd is proportional to the proportional constant K
The proportional control signal VNP (= Kp ×) is input to a proportional calculator 12a for multiplying p and an integrator 12b for time-integrating the rotational speed deviation signal and output from the proportional calculator 12a.
VNd) and the integration control signal VNI output from the integrator 12b.
[= KI∫VNd · dt (KI is an integral control constant)] is input to the manipulated variable calculator 12c.

The fuel supply necessary for reducing the rotational speed deviation calculated by the rotational speed deviation calculating means 11 to zero or below the allowable range by the proportional calculator 12a, the integrator 12b and the manipulated variable calculator 12c. The operation amount of the amount adjustment unit is calculated, and an operation amount signal that gives the calculated operation amount is supplied to the driving circuit 6.
Is constituted. The drive circuit 6 supplies a drive current to the actuator 5 so as to operate the fuel supply amount adjustment unit of the engine by the operation amount calculated by the operation amount calculation means 12.

Reference numeral 13 denotes voltage detection means for detecting the output voltage of the magnet type generator 2 and outputting a voltage detection signal VL having a magnitude proportional to the output voltage. The voltage detection means 13 is, for example, an output voltage of the engine. Can be constituted by a resistance voltage dividing circuit for dividing the voltage. Reference numeral 14 denotes voltage setting means for outputting a voltage setting signal V0 for giving a target output voltage of the generator 2, and the voltage setting means is constituted by, for example, a potentiometer to which a constant DC voltage is applied. Voltage setting means 1
The voltage setting signal V0 output by the control unit 4 is supplied to the voltage deviation calculating means 15 together with the voltage detection signal VL. The voltage deviation calculating means 15 comprises a voltage setting signal V0 and a voltage detection signal VL.
By calculating the difference between the output voltage and the target output voltage, a deviation between the output voltage of the generator 2 and the target output voltage is calculated, and a voltage deviation signal VLd (= VO-VL) for giving the deviation is output.

Reference numeral 16 denotes an internal combustion engine required to reduce the deviation between the output voltage of the generator detected by the voltage detecting means 13 and the target output voltage set by the voltage setting means 14 to zero or to a value less than an allowable range. A target rotation speed calculating means for calculating the number of rotations of 1 as a target rotation number for voltage control, the calculating means performing a proportional calculation on the voltage deviation signal VLd and outputting a proportional control signal VLp; An integrator 16b that performs an integral operation on the deviation signal VLd to output an integral control signal VLi; and a voltage control that computes a target rotational speed for voltage control from the proportional control signal VLp and the integral control signal VLi to provide the target rotational speed. And a target rotation speed calculator 16c for outputting a target rotation speed signal VNOL. The proportional calculator 16a performs an operation of multiplying the voltage deviation signal VLd by a proportional constant Kp 'to output a proportional control signal VLp = VLd * Kp', and the integrator 16b performs time integration of the voltage deviation signal to perform integral control. A signal VLi = KI'ＫVLd · dt (KI 'is an integral control constant) is output.

Reference numeral 17 denotes rotation speed setting means such as a potentiometer to which a constant DC voltage is applied. The rotation speed setting means is a target rotation speed for an external load 4 which is a target rotation speed of the external load 4 connected to the internal combustion engine. A target speed signal VNOM for an external load for outputting a number is output. The external load target rotation speed signal VNOM is input to the target rotation speed selection means 18 together with the voltage control target rotation speed VNOL.

The target rotation speed selection means 18 receives the outputs of the external load detection means 19 and the generator load detection means 20 as inputs, and sets the target rotation speed for voltage control in accordance with the presence or absence of an external load and the state of the load of the generator. And selecting one of the target rotation speeds for the external load as the target rotation speed of the internal combustion engine,
A target speed signal VNO for giving the selected target speed is provided to the speed deviation calculating means 11.

The external load detecting means 19 detects whether or not an external load is connected to the output shaft of the internal combustion engine. The detecting means is connected to, for example, an external load connecting portion of the output shaft of the engine. And a sensor such as a proximity switch for detecting the presence or absence of an external load. When an external load is connected to the output shaft of the engine via the electromagnetic clutch, the external load detecting means 19 is configured to detect the connection of the external load by turning on / off a switch for operating the electromagnetic clutch. You can also.

The generator load detecting means 20 detects whether or not a load is connected to the generator 2. The generator load detecting means includes, for example, a load current for detecting the load current of the generator 2. It can be constituted by a detector, a sensor (for example, a proximity switch) for detecting the presence or absence of a load connected to the generator.

In the power generator shown in FIG.
A rotation speed control loop is configured by a loop of the rotation speed detection unit 10-the rotation speed deviation calculation unit 11-the operation amount calculation unit 12-the drive circuit 6-the actuator 5-the internal combustion engine 1. Further, the internal combustion engine 1-the generator 2-the voltage detection means 13-the voltage deviation calculation means 15-the target rotation speed calculation means 16-the target rotation speed selection means 18-the rotation speed deviation calculation means 11-the manipulated variable calculation means 12-the drive circuit 6 The voltage control loop is constituted by the actuator 5 and the loop of the internal combustion engine 1.

In the internal combustion engine drive generator shown in FIG. 1, when the external load is not connected to the output shaft of the internal combustion engine and the load 3 is connected to the generator 2, the target rotation speed selecting means 18 sets A target voltage signal for voltage control provided by the rotation speed calculating means 16 (an engine required to reduce the deviation between the rotation speed of the internal combustion engine, the output voltage of the generator, and the target output voltage to zero or to be within an allowable range). Target rotation speed) V
NOL is selected and given to the rotation speed deviation calculating means 11 as a target rotation speed signal VNO. At this time, the rotational speed deviation calculating means 11 calculates the deviation between the engine rotational speed detected through the rotational speed detecting means 10 and the voltage control target rotational speed as a rotational speed deviation. Further, the operation amount calculating means 12 calculates an operation amount (operation amount of the actuator) of the fuel supply amount adjustment unit necessary to make the rotation speed deviation zero or to keep the deviation below the allowable range. At this time, the drive circuit 6 supplies the actuator 5 with a drive current necessary for operating the fuel supply amount adjustment unit by the operation amount calculated by the operation amount calculation means 12 to operate the actuator. Accordingly, the engine is controlled so that the deviation between the rotation speed of the internal combustion engine and the target rotation speed for voltage control is made zero or the deviation is suppressed to an allowable range or less, and the output voltage of the generator and the target voltage are controlled. Is made zero or the deviation is kept below an allowable range.

When the load 3 is not connected to the generator 2 and the external load 4 is connected to the internal combustion engine,
The target speed selecting means 18 selects the external load target speed signal VNOM provided from the speed setting means 17,
This signal is given to the rotation speed deviation calculating means 11 as a target rotation speed signal VNO. At this time, the rotational speed deviation calculating means 11 determines the deviation between the rotational speed of the internal combustion engine and the target rotational speed for external load to be zero or the target rotational speed of the engine necessary for suppressing the deviation to be below the allowable range. Calculate as number deviation. Further, the operation amount calculating means 12 calculates the operation amount of the fuel supply amount adjusting section necessary to make the rotational speed deviation zero or to keep it below the allowable range.
A drive current required to operate the fuel supply amount adjustment unit by the operation amount calculated in step 2 is supplied to the actuator 5 to operate the actuator. As a result, the deviation between the engine speed and the external load target speed is reduced to zero,
Alternatively, control is performed such that the deviation is kept within an allowable range.

The target rotational speed selecting means 18 also detects that the load of the generator 2 is connected by the generator load detecting means 20 and that the external load 4 is connected by the external load detecting means 19. When it is detected, a predetermined one of the external load target rotation speed signal VNOM and the voltage control target rotation speed signal VNOL is selected, and the selected signal is set as the target rotation speed signal VNO to calculate the rotation speed deviation. Give to means 11. When both the external load and the generator load are connected, which of the external load target speed signal VNOM and the voltage control target speed signal VNOL is the target speed signal VNO is determined by Determined appropriately according to the application.

In the above example, when both the connection of the external load and the connection of the load of the generator are detected, the target rotation speed for the external load and the target rotation speed for the voltage control are detected. Although the target speed selection means 18 is configured to select one of the predetermined target speeds, the configuration of the target speed selection means 18 is not limited to the above example. And when the load of the generator is connected, the deviation between the output voltage of the generator detected by the voltage detecting means 13 and the target output voltage is set. When it is within, the target rotation speed for the external load is selected, and both the connection of the external load and the connection of the generator load are detected and detected by the voltage detection means. To select the target voltage controlled rotational speed when the deviation between the output voltage and the target output voltage of the electric machine exceeds the set range, may constitute a target rotational speed selecting means.

The target speed selection means 18 detects that the load of the generator is not connected by the generator load detection means 20 and detects that the external load 4 is connected by the external load detection means 19. In this case, the external load target rotation speed is selected, the generator load detecting means detects that the load 3 of the generator is connected, and the external load detecting means 19 determines that the external load 4 is not connected. If it is detected, the target speed for voltage control is selected, and both the connection of the external load 4 and the connection of the load 3 of the generator are detected. When the deviation between the internal combustion engine rotational speed and the external load target rotational speed is within the set range, the voltage control target rotational speed is selected and the external load is connected. And that the load of the generator is connected, and the deviation between the rotation speed of the internal combustion engine detected by the rotation speed detection means 10 and the target rotation speed for the external load exceeds the set range. In such a case, the target rotation speed for external load may be selected.

When the load current detecting means for detecting the load current of the generator is used as the means for detecting the load 3 of the generator 2, the target speed selecting means 18 is connected to the generator by the load current detecting means. When it is detected that no load current is flowing, and when the external load detecting means detects that an external load is connected, a target rotational speed for the external load is selected, and the load current is supplied to the generator by the load current detecting means. When the flow is detected and the external load detecting means detects that the external load is not connected, the target speed for voltage control is selected, and that the external load is connected and the load is applied to the generator. When both of the currents are detected and the load current detected by the load current detector is within the set range, the target speed for external load is selected. If both the external load is connected and the load current is flowing to the generator, and the load current detected by the load current detector is out of the set range, it is used for voltage control. It may be configured to select the target rotation speed.

In the example shown in FIG. 1, the differential control signal Vd generated by the differentiator 8 functions to suppress a change in the engine speed as the engine speed approaches the target engine speed. In the process of the engine speed approaching the target speed, the sum signal of the voltage signal VN and the differential control signal Vd proportional to the speed exceeds the target speed signal VN0 given by the target speed selecting means 18. Then, a correcting operation for operating the actuator in a direction to decrease the rotation speed of the engine is performed. As described above, when a differentiator is provided in the rotation speed detecting means 10 and the signal of the sum of the voltage signal proportional to the rotation speed and the differential signal is used as the rotation speed detection signal, the rotation speed of the engine becomes the target rotation speed. Since the change in the rotation speed is suppressed in the process of rising toward, the fuel supply amount to the internal combustion engine is limited before the engine rotation speed exceeds the target rotation speed, and the correction operation is started, It is possible to prevent an overshoot from occurring when the rotation speed greatly exceeds the target rotation speed, and it is possible to always perform the rotation speed control operation stably.

In the example of FIG. 1, the external load detecting means 19 and the generator load detecting means 20 are provided so that the target speed selecting means 18 automatically selects the target speed.
It is also possible to omit the external load detecting means 19 and the generator load detecting means 20 and manually select the target rotation speed. In this case, the target speed selection means
It can be configured by a manually operated selection switch.

When the external load detecting means 19 and the generator load detecting means 20 are omitted, and the target rotational speed selecting means 18 is constituted by a selection switch which is manually operated, the specific structure of the control unit of the power generating apparatus shown in FIG. An example is shown in FIG.

In the example shown in FIG. 2, an operational amplifier OP1 having a positive-phase input terminal grounded, a capacitor C1 having one end connected to the negative-phase input terminal of the operational amplifier OP1, and one end connected to the other end of the capacitor C1. A differentiator 8 is constituted by the connected resistor R1 and the feedback resistor R2 connected between the output terminal and the negative-phase input terminal of the operational amplifier OP1, and a rotational speed detector is connected between the other end of the resistor R1 and ground. (Not shown in FIG. 2) is input. Differentiator 8
Outputs a differential control signal Vd by time-differentiating the voltage signal VN.

The adder 9 includes an operational amplifier OP2, resistors R3 and R4 each having one end connected to a positive-phase input terminal and a negative-phase input terminal of the operational amplifier OP2, and an operational amplifier OP2.
2 and resistors R5 and R6 respectively connected between the positive-phase input terminal and ground and between the negative-phase input terminal and ground,
A feedback signal R7 is connected between the output terminal of P2 and the negative-phase input terminal, and the voltage signal VN obtained from the rotational speed detector is input to the positive-phase input terminal of the operational amplifier OP2 through the resistance R3. At the same time, the differential control signal Vd obtained from the differentiator 8 is supplied to the operational amplifier OP through the resistor R4.
2 is input to the negative-phase input terminal. This adder 9
A signal VN + Vd of the sum of the differential control signal Vd and the voltage signal VN proportional to the rotation speed is output as a rotation speed detection signal.

The output terminal of the operational amplifier OP2 is connected to a resistor R8
Through the input terminal of the operational amplifier OP3. One end of a resistor R9 is connected to the output terminal of the operational amplifier OP3, and an integrating capacitor C2 is connected between the other end of the resistor R9 and ground. The other end of the resistor R9 is connected to the positive-phase input terminal of an operational amplifier OP4 having a direct connection between the output terminal and the negative-phase input terminal, and the output terminal of the operational amplifier OP4 is connected to the positive phase of the operational amplifier OP3 through a resistor R10. Connected to input terminal. Resistors R11 and R12 are connected between the positive-phase input terminal of the operational amplifier OP3 and the ground and between the negative-phase input terminal and the ground, respectively, and a feedback resistor R13 is connected between the output terminal and the negative-phase input terminal of the operational amplifier OP3. ing. One end of a resistor R14 is connected to the negative-phase input terminal of the operational amplifier OP3.
The target speed signal VNO is input to the opposite-phase input terminal of the operational amplifier OP3 through the line.

In this example, the operational amplifier OP3 and the operational amplifier OP4 to which the output of the operational amplifier OP3 is input.
, The integrating capacitor C2, and the resistors R8 to R13 form the integrator 12b of FIG.
The integration control signal VNI can be obtained at the output terminal of. The operational amplifier OP3 functions to perform a complete integration operation over the entire frequency change range. The operational amplifier O
The rotation speed deviation calculating means 11, the proportional calculator 12a, and the manipulated variable calculator 12c are determined by P3 and the resistors R8 to R13.
And an operation amount signal VNI + for giving an operation amount of the fuel supply amount adjustment section of the internal combustion engine to the output terminal of the operational amplifier OP3.
VNP can be obtained.

That is, in the example shown in FIG. 2, the operational amplifiers OP3 and OP4 and the resistors R8 to R14 constitute the rotational speed deviation calculating means 11 and the manipulated variable calculating means 12 of FIG. The operation amount signal VNI + VNP output from the operation amount calculating means is given to the drive circuit 6.

In the example shown in FIG. 2, a potentiometer VR1 with a constant DC voltage applied to both ends, a series circuit of resistors R15 and R16 with a constant DC voltage applied to both ends, and a resistor R15 and R16 A voltage setting means 14 is constituted by a resistor R17 connected between the connection point of the potentiometer VR1 and a terminal connected to the slider of the potentiometer VR1, and a voltage setting signal VO for applying a target output voltage of the generator to both ends of the resistor R16.
Is obtained. The voltage setting signal VO can be appropriately adjusted by adjusting the position of the slider of the potentiometer VR1.

In the example shown in FIG. 2, the operational amplifier OP
5 and OP6 and the resistors R18 to R24 constitute the voltage deviation calculating means 15 and the target rotational speed calculating means 16 in FIG. The circuit constituting the voltage deviation calculating means 15 and the target rotation speed calculating means 16 is the rotation speed deviation calculating means 11.
And a circuit constituting the operation amount calculating means 12. The operational amplifier OP5 and the operational amplifier OP5
The operational amplifier OP6, the integrating capacitor C3, and the resistors R18 to R23, to which the output of the circuit of FIG.
b is composed of an operational amplifier OP5 and resistors R18 to R23.
These form a voltage deviation calculating means 15, a proportional calculator 16a, and a target rotational speed calculator 16c. And
The voltage setting signal VO and the voltage detection signal VL are input to the positive-phase input terminal and the negative-phase input terminal of the operational amplifier OP5 through resistors R18 and R24, respectively. The output terminal of the operational amplifier OP6 receives the integration control signal VLi, and the operational amplifier OP5. At the output terminals of the generators so as to obtain a target engine speed signal VNOL which gives a target engine speed required to reduce the deviation between the output voltage of the generator and the target output voltage to zero or to be within an allowable range. Has become.

The rotation speed setting means 17 for setting the rotation speed of the external load includes a potentiometer VR2 having a constant DC voltage applied to both ends thereof, and a series circuit of resistors R25 and R26 having a constant DC voltage applied to both ends. , A resistor R27 connected between a connection point of the resistors R25 and R26 and a terminal connected to the slider of the potentiometer VR2, and an output terminal and a negative-phase input terminal directly connected to form a voltage follower circuit. The voltage obtained at both ends of the resistor R26 is inputted to the positive-phase input terminal of the operational amplifier OP7. The rotation speed setting means 17 outputs a voltage signal for giving a target rotation speed of the external load 4 to a target rotation speed signal V for external load.
It is output from the output terminal of the operational amplifier OP7 as NOM.
This external load target rotation speed signal VNOM can be appropriately adjusted by adjusting the position of the slider of the potentiometer VR2.

In the illustrated example, the target rotation speed selection means 18
Is a changeover switch S having fixed contacts a and b and a movable contact c which is connected to the fixed contacts a and b.
The fixed contacts a and b are connected to the output terminal of the operational amplifier OP5 of the circuit constituting the voltage deviation computing means 15 and the target rotational speed computing means 16 and the operational amplifier OP7 of the circuit constituting the rotational speed setting means 17, respectively. Connected to output terminal. A terminal connected to the movable contact of the changeover switch SW is input through a resistor R14 to an opposite-phase input terminal of an operational amplifier OP3 of a circuit constituting the rotational speed deviation calculating means 11 and the manipulated variable calculating means 12.

That is, in this example, the changeover switch SW
Is operated, the voltage control target speed signal VNO
Either L or the external load target rotation speed signal VNOM is selected and input to the operational amplifier OP3 which forms a part of the rotation speed deviation calculation means.

In the example shown in FIG. 2, each part of the control device is constituted by an analog circuit. However, the rotation speed detection means 10, the rotation speed deviation calculation means 11, the operation amount calculation means 12, the voltage deviation calculation means 15, the target rotation speed The numerical calculation means 16 and the like can be configured using a microcomputer.

In the above description, the external load 4
However, the present invention can be applied to a case where the generator 2 is driven solely by the internal combustion engine 1 without connecting an external load. In that case, in the configuration of FIG. 1, the target rotation speed selection unit 18, the rotation speed setting unit 17, the external load detection unit 19, and the generator load detection unit 20 are omitted, and the target rotation speed calculation unit 1 is omitted.
The target rotation speed signal output by 6 is directly supplied to the rotation speed deviation calculating means 11.

[0069]

As described above, according to the present invention, a control loop for controlling the deviation between the rotational speed of the internal combustion engine and the target rotational speed within an allowable range is provided, and the output voltage of the generator and the target voltage are controlled. A target rotation speed calculating means for calculating a target rotation speed of the engine necessary for reducing a deviation from the output voltage to zero or less than an allowable range as a target rotation speed for voltage control; Is set as the target rotation speed for the control loop, so that when the load on the generator is increased, the rotation speed of the engine is prevented from rising beyond an allowable range. Thus, it is possible to prevent the engine speed from excessively increasing due to an increase in the load on the generator, thereby shortening the life of the engine and preventing the engine from breaking down.

In the present invention, there is further provided a target rotation speed setting means for setting a target rotation speed for the external load, and either of the target rotation speed for the external load obtained from the setting means or the target rotation speed for the voltage control is provided. If the target rotation speed selected by the selection device is set as the target rotation speed of the control loop for controlling the rotation speed, the external load is set by the internal combustion engine. In both the case of driving and the case of driving the generator by the internal combustion engine, the rotation speed of the engine can be accurately controlled.

[Brief description of the drawings]

FIG. 1 is a block diagram showing an example of the configuration of an internal combustion engine driven power generation device according to the present invention.

FIG. 2 is a circuit diagram showing an example in which each part of a control device used in the power generator of FIG. 1 is concretely illustrated;

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Internal combustion engine, 2 ... Generator, 3 ... Electric load, 4 ... External load, 5 ... Actuator, 6 ... Drive circuit, 7 ... Revolution detector, 8 ... Differentiator, 9 ... Adder, 10 ... Revolution Detecting means, 11: rotational speed deviation calculating means, 12: manipulated variable calculating means, 13: voltage detecting means, 14: voltage setting means, 15 ...
Voltage deviation calculating means, 16 ... Target rotational speed calculating means.

Continued on the front page F-term (reference) 3G093 AA16 BA17 DA01 DB19 DB20 DB26 EA03 EC01 FA04 FB05 5H590 AA01 AA24 AB15 CA07 CA23 CB03 CC02 CC05 CC18 CE10 DD64 EA07 EB02 EB12 EB21 EB29 FA01 FC05 FC21 FC22 FC26 GA02 HA10 GB02 JA13 JA14 JA15 JB07

Claims (8)

[Claims] 1. An internal combustion engine comprising: an internal combustion engine; a magnetic generator driven by the internal combustion engine; and a control device for controlling the internal combustion engine so as to keep an output voltage of the magnetic generator at a set value. In the engine-driven power generator, the control device includes: an actuator that operates a fuel supply amount adjustment unit of the internal combustion engine in accordance with a given drive current; a rotation speed detection unit that detects a rotation speed of the internal combustion engine; Voltage detecting means for detecting an output voltage of the generator; voltage setting means for setting a target output voltage of the generator; an output voltage detected by the voltage detecting means and a target output voltage set by the voltage setting means. Target speed calculating means for calculating the rotation speed of the internal combustion engine necessary to reduce the deviation from zero or below the allowable range as a target speed for voltage control; and Rotation speed deviation calculation means for calculating the difference between the rotation speed of the internal combustion engine detected by the output means and the target speed for voltage control as a rotation speed deviation; and setting the rotation speed deviation to zero or below an allowable range. An operation amount calculating means for calculating an operation amount of the fuel supply amount adjustment unit required to suppress the pressure; and an actuator driven to operate the fuel supply amount adjustment unit by the operation amount calculated by the operation amount calculation means. A drive circuit for applying a current, wherein the target rotation speed calculating means is configured to limit the target rotation speed to an upper limit value of an allowable range of the rotation speed of the internal combustion engine. Internal combustion engine drive generator. 2. An internal combustion engine comprising: an internal combustion engine; a magnetic generator driven by the internal combustion engine; and a control device for controlling the internal combustion engine to maintain an output voltage of the magnetic generator at a set value. In the engine-driven power generator, an external load connecting portion for connecting an external load other than the generator is provided on an output shaft of the internal combustion engine, and the control device controls a fuel of the internal combustion engine in accordance with a given drive current. An actuator that operates a supply amount adjusting unit; a rotation speed detection unit that detects a rotation speed of the internal combustion engine; a voltage detection unit that detects an output voltage of the generator; and a voltage that sets a target output voltage of the generator. Setting means; and an internal voltage necessary to reduce a deviation between an output voltage detected by the voltage detecting means and a target output voltage set by the voltage setting device to zero or to be equal to or less than an allowable range. Target speed calculating means for calculating a speed of the engine as a target speed for voltage control; speed setting means for setting a target speed for external load that gives a target speed of the external load connection portion; and the voltage control. Target speed selecting means for selecting any one of a target rotational speed for external use and a target rotational speed for external load as a target rotational speed of the internal combustion engine; and a rotational speed of the internal combustion engine detected by the rotational speed detection means. A rotation speed deviation calculating unit for calculating a difference between the rotation speed deviation and a target rotation speed selected by the target rotation speed selection means as a rotation speed deviation; An operation amount calculation unit for calculating an operation amount of the fuel supply amount adjustment unit; and an actuator driven to operate the fuel supply amount adjustment unit by the operation amount calculated by the operation amount calculation unit. And a drive circuit for providing a flow, wherein the target rotation speed calculation means is configured to limit the target rotation speed to an upper limit value or less of an allowable range of the rotation speed of the internal combustion engine. Internal combustion engine drive generator. 3. A generator load detecting means for detecting whether or not a load is connected to the generator, wherein the target rotation speed selecting means detects a load of the generator by the generator load detecting means. When the connection is detected, the target speed for voltage control is selected, and when the load of the generator is detected to be not connected by the generator load detection means, the external power source is selected. The internal combustion engine drive generator according to claim 2, wherein the load target rotation speed is selected. 4. An external load detecting means for detecting whether or not an external load is connected to the internal combustion engine, wherein the target rotational speed selecting means is connected to the external load by the external load detecting means. When the absence of the external load is detected, the voltage control target rotation speed is selected, and when the external load detection unit detects that the external load is connected, the external load target rotation speed is selected. 3. The apparatus according to claim 2, wherein the apparatus is configured to select the information.
An internal combustion engine driven power generator according to claim 1. 5. An external load detecting means for detecting whether an external load is connected to an external load connecting portion of the internal combustion engine, and a generator load for detecting whether a load is connected to the generator. Detecting means for detecting that the load of the generator is not connected by the generator load detecting means, and connecting the external load by the external load detecting means. The external load target rotation speed is selected when the external load is detected, the generator load detecting means detects that the load of the generator is connected, and the external load detecting means detects the external load. Is not connected, the voltage control target speed is selected, and both that the external load is connected and that the load of the generator is connected are 3. The internal combustion engine according to claim 2, wherein when it is output, one of predetermined target rotation speeds is selected from the external load target rotation speed and the voltage control target rotation speed. Engine driven generator. 6. An external load detecting means for detecting whether an external load is connected to an external load connecting portion of the internal combustion engine, and a generator load for detecting whether a load is connected to the generator. Detecting means for detecting that the load of the generator is not connected by the generator load detecting means, and connecting the external load by the external load detecting means. When the external load is detected, the target speed for the external load is selected, the generator load detecting means detects that the load of the generator is connected, and the external load detecting means detects the external load. When it is detected that no connection is made, the target speed for voltage control is selected, and both that the external load is connected and that the load of the generator is connected Is detected and when the deviation between the output voltage of the generator and the target output voltage detected by the voltage detecting means is within a set range, the external load target rotation speed is selected, A deviation between the output voltage of the generator and the target output voltage detected by the voltage detecting means is detected when both the connection of the load and the connection of the load of the generator are detected. The internal-combustion-engine-driven power generator according to claim 2, wherein the target speed for voltage control is selected when the value exceeds the set range. 7. An external load detecting means for detecting whether or not an external load is connected to an external load connecting portion of the internal combustion engine, and a generator load for detecting whether or not a load is connected to the generator. Detecting means for detecting that the load of the generator is not connected by the generator load detecting means, and connecting the external load by the external load detecting means. When it is detected that the external load target rotation speed is selected, the generator load detecting means detects that the load of the generator is connected, and the external load detecting means detects the external load. When it is detected that no connection is made, the target speed for voltage control is selected, and both that the external load is connected and that the load of the generator is connected Is selected and the voltage control target rotation speed is selected when the deviation between the rotation speed of the internal combustion engine detected by the rotation speed detection means and the external load target rotation speed is within a set range. The number of rotations of the internal combustion engine and the number of rotations of the external load which are both detected that the external load is connected and that the load of the generator is connected are detected by the rotation number detecting means. The internal combustion engine drive generator according to claim 2, wherein the external load target rotation speed is selected when a deviation from the target rotation speed exceeds a set range. 8. An external load detecting means for detecting whether an external load is connected to an external load connecting portion of the internal combustion engine, and a load current detecting means for detecting a load current of the generator, The target rotation speed selecting means, when the load current detecting means detects that no load current is flowing through the generator, and when the external load detecting means detects that the external load is connected, An external load target rotation speed is selected, the load current detection means detects that a load current is flowing through the generator, and the external load detection means detects that the external load is not connected. The target speed for voltage control is selected, and it is detected that both the connection of the external load and the flow of load current to the generator have been detected. When the load current detected by the current detector is within the set range, the target speed for the external load is selected, and the external load is connected and the load current flows to the generator. And when the load current detected by the load current detector is out of the set range, the voltage control target speed is selected. Item 3. An internal combustion engine driven power generation device according to item 2.