JPH0826801B2 - Rotation control device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a rotation control device, and more particularly, to a high speed rotation side control of a prime mover when an abnormal state occurs in a control system for controlling the rotation speed of the prime mover at a constant speed. Relates to the fail-safe of the rotational speed controlled so that is always denied.

(Prior art) Conventionally, in a generator system, a governor control device is provided to keep the rotation speed of the prime mover constant, and the governor control device keeps the rotation speed of the prime mover constant even when the generator load fluctuates. However, an automatic control system that keeps the frequency of the generator constant is used.

Conventionally, a mechanical type governor control device has been used, but recently, an electronic type governor control device has been used.

The electronic governor control device used in the conventional engine generator is, for example, a failure of the rotation speed detection circuit system that detects the rotation speed of the prime mover, or each circuit unit that constitutes the electronic governor control device. When there is an abnormality in the control system due to a failure of the power supply system that supplies power to each, there is no means to deal with these, and the rotation of the prime mover naturally stops. It was expected to work in the direction of doing.

(Problems to be solved by the invention) When a failure occurs in the rotation speed detection circuit system or the power supply device and an abnormal state occurs in the control system as in the conventional case, the rotation speed of the prime mover is always stopped. Not necessarily.

For example, when an abnormal situation occurs in the rotation speed detection circuit system and the rotation speed detection signal is stopped, it is mistakenly recognized as an abnormal decrease in rotation, and a control signal for increasing the rotation speed is output from the control system. The number of rotations rises and it runs out of control. Even if the power supply system fails, the control system may output a control signal for increasing the rotation speed of the prime mover due to the failure of the power supply system.

Therefore, in an engine generator system, when an abnormality occurs in such a rotation speed detection circuit system or power supply system, a fail-operator that always operates to control an abnormal increase in the rotation speed of the prime mover.
Realization of safe is desired.

The present invention has been made in view of the above points, and is against any cause, in particular, a factor that increases the rotational speed of a prime mover due to an abnormal situation of the rotational speed detection circuit system and the power supply system,
It is an object of the present invention to provide a rotation control device capable of preventing runaway of a prime mover by providing fail safe means in advance.

(Means for Solving the Problems) Therefore, the rotation control device of the present invention is provided with a governor control device, and in an engine generator device in which the constant speed rotation control of the prime mover is performed, the governor control device controls the rotation speed of the prime mover. A voltage detection circuit and a rotation speed detection circuit for detecting the voltage and the rotation speed, respectively, a fail-safe circuit for giving priority to the detection signal of one of the voltage detection circuit and the rotation speed detection circuit and using the detection signal as a rotation speed detection signal; An automatic gain adjustment circuit that detects the weight of the load of the prime mover and changes the gain of the control system according to the weight, and creates a control signal for PID control based on the output obtained from the automatic gain adjustment circuit. PID adjuster,
PWM for converting the output of the PID regulator into a pulse width control signal
A circuit section, an actuator for controlling rotation of a prime mover according to a PWM signal output from the PWM circuit section, and a power supply device for supplying positive and negative bipolar power to each of the circuit sections, and further the rotation speed detection circuit The fv converter that converts the detected rotation speed of the prime mover into a voltage is compared with a rotation speed detection signal of the fv converter and a predetermined reference voltage, and the rotation speed detection circuit system When an abnormality occurs in the rotation speed detection circuit system and the abnormality signal detection circuit that detects an abnormality, based on the abnormality generation signal output from the abnormality signal detection circuit, it is apparent that the prime mover is rotating at high speed. The present invention is characterized by including a buffer amplifier that outputs a rotation speed detection signal and amplifies the rotation speed detection signal output from the rotation speed detection circuit as it is when no abnormality occurs in the rotation speed detection circuit system. Control In a prime mover generator device including a device and performing constant-speed rotation control of a prime mover, a governor control device includes a voltage detection circuit and a rotation speed detection circuit for detecting the number of revolutions of the prime mover by a voltage and a rotation speed, respectively, and the voltage detection circuit. A fail-safe circuit that prioritizes the detection signal of either the detection circuit or the rotation speed detection circuit to be the rotation speed detection signal,
Detects the load weight of the prime mover, and creates a PID control signal based on the output obtained from the automatic gain adjustment circuit that changes the gain of the control system according to the weight. PID adjuster, PWM circuit section for converting the output of the PID adjuster into a pulse width control signal, an actuator for controlling the rotation of a prime mover according to the PWM signal output by the PWM circuit section, and the above-mentioned circuit sections A power supply device for supplying positive and negative bipolar power supplies to the rotation speed detection circuit, and the rotation speed detection circuit further includes an fv converter for converting the detected rotation speed of the prime mover into a voltage and a rotation speed of the fv converter An abnormality signal detection circuit that compares the detection signal with a predetermined reference voltage to detect an abnormality in the rotation speed detection circuit system, and from the abnormality signal detection circuit when an abnormality occurs in the rotation speed detection circuit system Based on the output error occurrence signal And outputs the rotation speed detection signal when the prime mover is rotating at high speed, and amplifies the rotation speed detection signal output from the rotation speed detection circuit as it is when no abnormality occurs in the rotation speed detection circuit system. A buffer amplifier, and the actuator includes an abnormal voltage detection circuit for detecting an abnormality of positive and negative bipolar voltages of the power supply device, and a switch section for controlling power supply to the actuator by the abnormal voltage detection circuit. And a throttle position control mechanism for setting the throttle position of the prime mover so as to attain a predetermined rotational speed when the switch unit is turned off and the power supply from the power supply device to the actuator is cut off. It is characterized by that. An embodiment of the present invention will be described below with reference to the drawings.

(Embodiment) FIGS. 1 (A) and 1 (B) are fail-safe embodiments of a rotation speed detection circuit of a rotation control device according to the present invention, and FIGS. 2 (A) and 2 (B) show the present invention. FIG. 3 is a fail-safe embodiment of the rotation control device according to the present invention. FIG. 3 is a fail-safe embodiment of the rotation control device power supply device according to the present invention. FIG. 3 is a perspective view of the actuator portion of FIG. 3, and FIG. 5 shows an embodiment of the engine generator device in which the fail safe relating to the rotation speed detection circuit and the power supply device of the rotation control device according to the present invention is used. .

Before describing each fail-safe of the rotation control device according to the present invention in FIGS. 1 to 4, the outline in which the prime mover in the engine generator is automatically controlled by the governor control device will be described with reference to FIG. To explain.

In FIG. 5, reference numeral 1 is an engine generator, 2 is a rotation speed detection circuit, 3 is a voltage detection circuit, 4 is a fail safe circuit, 5 is an automatic gain adjustment circuit, 6 is a PID regulator, 7 is an amplifier, 8 Is a PWM circuit unit, 9 is an actuator, and 10 is a power supply device.

From the prime mover or the generator side of the engine generator 1, the rotation fluctuation of the engine generator 1 due to the load fluctuation or some cause is individually detected by the rotation speed detection circuit 2 and the voltage detection circuit 3. To be done. As for the rotation speed detection signal detected by the rotation speed detection circuit 2 and the voltage detection signal detected by the voltage detection circuit 3, one of the detection signals, for example, the voltage detection signal, is preferentially given by the fail-safe circuit 4. It is selected as a rotation speed detection signal of the power generator 1. When an abnormality occurs in the voltage detection circuit 3 system, the other rotation speed detection signal is replaced with the voltage detection signal obtained from the voltage detection circuit 3 and the rotation speed detection signal obtained from the rotation speed detection circuit 2 is used as the rotation speed detection signal. The number is detected by the fail safe circuit 4 as a number detection signal to prevent the occurrence of abnormal rotation such as runaway of the prime mover. The automatic gain adjusting circuit 5 detects the light weight of the current load, that is, the weight from the output of the power generator 1 and determines the gain of the control system according to the weight of the load. Then, the detection signal selected from the fail-safe circuit 4, that is, the voltage detection signal is amplified so that the gain of the system becomes the determined value. Subsequently, the PID adjuster 6 minimizes the residual deviation between the target value and the final value, that is, the steady-state error, and the response is also changed to a control signal that should quickly follow the rotational fluctuation. The control signal is amplified by the amplifier 7 and further converted by the PWM circuit 8 into a PWM signal. The actuator 9 of the rotary encoder is controlled by the PWM signal, and the rotation speed of the prime mover in the engine generator 1 is controlled to be constant depending on the angle output by the actuator. Positive or negative 2 from power supply 10 to each circuit
Polarity power supply voltage is being supplied. A positive / negative control angle signal for positively or negatively rotating the rotary encoder of the actuator 9 in accordance with the pulse width of the PWM signal by a positive / negative voltage supplied from the power supply device 10 to keep the rotational speed of the prime mover constant. Is getting

Next, the fail-safe relating to the rotation speed detection circuit of the rotation control device according to the present invention will be described with reference to FIGS. 1 (A) and 1 (B).

In FIGS. 1A and 1B, 11 is an fv converter, 12 is an abnormal signal detection circuit, 13 is a buffer amplifier, 14, 15
Is an operational amplifier, 16 is a diode, 17 is a variable resistor, and 18 and 19 are resistors.

In FIG. 1 (A), the fv converter 11 has an output characteristic such that its output voltage is directly proportional to the input frequency. That is, when the rotational speed of the engine generator 1 is low, the output voltage is low, and when the rotational speed of the engine generator 1 is high, the output voltage is high.

Now, the signal input to the fv converter 11 is interrupted due to a failure of the rotation speed detection unit that detects the rotation speed from the engine generator 1, and the output voltage of the fv converter 11, that is, the rotation speed detection signal is When the voltage drops abnormally, the voltage of the rotational speed detection signal that has abnormally dropped and the reference voltage predetermined by the variable resistor 17 are compared by the operation amplifier 14, and the operation amplifier 14
Outputs "L". Therefore, an abnormality occurrence signal is sent to the buffer amplifier 13 via the diode 16 and the inverting input terminal of the operation amplifier 15 is set to "L". As a result, the operation amplifier 15 outputs “H”, and the engine generator 1 is apparently generated.
The rotation speed detection signal when the rotation speed is rotating at high speed is sent to the next-stage automatic gain adjustment circuit 5 via the fail-safe circuit 4. Assuming that the prime mover is rotating at a high speed, the automatic gain control circuit 5 and subsequent control systems automatically control the rotation so as to reduce the rotation. Therefore, the rotation speed detection circuit 2
When an abnormal situation occurs in the system, an abnormal signal is sent from the abnormal signal detection circuit 12 to the buffer amplifier 13, and the high speed rotation of the prime mover is simulated by the buffer amplifier 13. Therefore, fail-safe operation works and the runaway of the prime mover is prevented. In the normal state, the voltage of the rotation speed detection signal output from the fv converter 11 has a variable resistance.
Since the variable resistor 17 is set to be higher than the reference voltage of 17, the output of the operational amplifier 14 is "H", the diode 16 is reverse biased, and the buffer amplifier 13 operates as a normal amplifier.

As described with reference to FIG. 5, the voltage detection signal of the voltage detection circuit 3 is prioritized as the rotation speed detection signal, and the voltage detection circuit 3
When an abnormality occurs in the system, the rotation speed detection signal of the rotation speed detection circuit 2 is used as a rotation speed detection signal as a fail safe circuit 4
Selected in. When an abnormal state also occurs in the rotation speed detection circuit 2 system, the abnormal signal detection circuit 12 sends an abnormality occurrence signal to the buffer amplifier 13 and apparently the engine generator 1
Is simulated as an abnormally high-speed rotation, so that the automatic gain control circuit 5 and the control system prevents the motor from abnormally increasing rotation, that is, runaway.

FIG. 1B shows an operational amplifier in the abnormal signal detection circuit 12.
The operational amplifier is the same as the 14 input terminals replaced.
The reference voltage of the variable resistor 17 is input to the non-inverting input terminal of 14, and the output voltage of the fv converter 11, that is, the rotation speed detection signal is input to the inverting input terminal of the operational amplifier 14. . The polarity of the diode 16 is connected in the opposite direction to that of FIG. 1 (A), and the same operation as that of FIG. 1 (A) is performed. Therefore, since the operation of FIG. 1 (B) is the same as that of FIG. 1 (A), the description thereof will be omitted.

The configuration in which the output characteristic of the fv converter 11 is inversely proportional is shown in FIGS. 2 (A) and 2 (B).

In FIGS. 2A and 2B, reference numerals 12 to 19 correspond to those in FIGS. 1A and 1B, and reference numeral 20 represents an fv converter.

In FIG. 2 (A), the fv converter 20 has an output characteristic in which its output voltage is inversely proportional to the input frequency. That is, when the rotational speed of the engine generator 1 is low, the output voltage is high, and when the rotational speed of the engine generator 1 is high, the output voltage is low.

Now, the signal input to the fv converter 20 is stopped due to a failure of the rotation speed detection unit that detects the rotation speed from the engine generator 1, and the output voltage of the fv converter 20, that is, the rotation speed detection signal is When abnormally increased, the voltage of the abnormally increased rotation speed detection signal and a reference voltage predetermined by the variable resistor 17 are compared by the operation amplifier 14, and the operation amplifier 14 is compared.
“H” is output from 14. Therefore, an abnormality occurrence signal is sent to the buffer amplifier 13 via the diode 16,
The inverting input terminal of the amplifier 15 is set to "H". As a result, the operation amplifier 15 outputs "L", and the rotation speed detection signal when the rotation speed of the engine generator 1 is apparently rotating at high speed is transmitted via the fail safe circuit 4 to the gain automatic control of the next stage. It is sent to the adjustment circuit 5. Assuming that the prime mover is rotating at a high speed, the automatic gain control circuit 5 and subsequent control systems automatically control the rotation so as to reduce the rotation. Therefore, the rotation speed detection circuit 2
When an abnormal situation occurs in the system, an abnormal signal is sent from the abnormal signal detection circuit 12 to the buffer amplifier 13, and the high speed rotation of the prime mover is simulated by the buffer amplifier 13. Therefore, fail-safe operation works and the runaway of the prime mover is prevented. In the normal state, the voltage of the rotation speed detection signal output from the fv converter 20 has a variable resistance.
The variable resistor 17 is set so as to be lower than the reference voltage of 17, so that the output of the operational amplifier 14 is "L", the diode 16 is reverse biased, and operates as a normal amplifier of the buffer amplifier 13.

FIG. 2B shows an operational amplifier in the abnormal signal detection circuit 12.
The operational amplifier is the same as the 14 input terminals replaced.
The reference voltage of the variable resistor 17 is input to the non-inverting input terminal of 14, and the output voltage of the fv converter 20, that is, the rotation speed detection signal is input to the inverting input terminal of the operational amplifier 14. . And the polarity of the diode 16 is the second
It is connected in the opposite direction to that of FIG. 2A, and the same operation as that of FIG. 2A is performed. Therefore, the operation of FIG. 2 (B) is the same as that of FIG. 2 (A), and the description thereof is omitted.

FIG. 3 shows a fail-safe embodiment of the power supply device of the circuit control device according to the present invention.
9 and 10 correspond to those in FIG. Reference numeral 21 is an abnormal voltage detection circuit, 22 is a switch unit, 23 is a spring, 24 is a shaft, 25 is a throttle, and 26 is a tube.

When an abnormality occurs in one of the positive and negative bipolar voltages supplied from the power supply device 10 to each circuit unit, the abnormal voltage detection circuit 21 that detects the normality of these positive and negative bipolar voltages detects the abnormal voltage. . For example, the abnormal voltage detection circuit 21 has two predetermined high and low reference voltages, and outputs a control signal when the positive / negative bipolar voltage supplied from the power supply device 10 is higher or lower than these reference voltages. Output, switch section
Turn off contact 22. As a result, the power supply device from the power supply device 10 to the actuator 9 is cut off, and the actuator 9 becomes free.

The actuator 9 controls the throttle 25 by a motor 27 shown in FIG. 4, for example. The motor 27 is driven by a control angle signal based on the position detection of a rotary encoder (not shown). Further, the motor 27 is provided with an anchor 29 fixed to the base 28 and an elastic member fixed to the shaft 24 of the motor 27, for example, a spring 23, so that when the actuator 9 becomes free. , The motor 27 is also in a free state. When the motor 27 becomes free, the horn 30 fixed to the shaft 24 is rotated by the elastic force of the spring 23, and the opening / closing angle of the throttle 25 is controlled via the horn 30. When the motor 27 is in a free state, the opening / closing angle of the throttle 25 is set by the elastic force of the spring 23 to a position where the number of revolutions of the prime mover is a predetermined number of revolutions, for example, a position where the prime mover has no load rated rotation. If set, when the motor 27 is in a free state, the rotation speed of the prime mover shifts toward a predetermined rotation speed, that is, the above-mentioned no-load rated rotation speed, and does not rise further. .

Therefore, when an abnormality occurs in the positive / negative bipolar voltage supplied by the power supply device 10, the abnormal voltage detection circuit 21 turns off the contact of the switch unit 22, the actuator 9, that is, the motor 27 becomes free state, and the elasticity of the spring 23. Throttle 25 is controlled by the force at a position where the speed of the prime mover should reach the above no-load rated speed, and a fail-safe that suppresses runaway of the prime mover even if the power supply system 10 fails.

In FIG. 4, the horn is attached to the shaft 24 of the motor 27.
Although the structure is such that 30 is fixed and the opening / closing angle of the throttle 25 is controlled via the horn 30, a structure in which the shaft 24 of the motor 27 is directly connected to the throttle 25 can be used. Become.

Further, in place of the abnormal voltage detection circuit 21 shown in FIG. 3, the normality of the PWM signal from the PWM circuit unit 8 input to the actuator 9 is detected, and when the abnormality of the PWM signal is detected, the contact point of the switch unit 22 is detected. May be turned off. With such a configuration, runaway of the prime mover due to a failure of the power supply unit 10 system can be suppressed.

(Effects of the Invention) As described above, according to the present invention, when an abnormal situation occurs in the rotation speed detection circuit system or the power supply system, a failure occurs.
The safe operates, and the rotation speed of the prime mover is constantly suppressed, and the rotation speed of the prime mover is controlled in a safe rotation direction. The control circuit and mechanism are simple, highly reliable, and inexpensive to manufacture.

In case of fail safe for the rotation speed detection circuit,
Since the abnormal signal detection circuit is simply inserted between the fv converter and the buffer amplifier, it is highly versatile.

In case of fail-safe related to power supply,
The rotation speed of the prime mover at the time of an abnormality can be freely set to any rotation speed by setting the spring, and the setting can be done easily.
When the prime mover is started, the prime mover can be smoothly started up to this set speed unconditionally.

[Brief description of drawings]

1 (A) and 1 (B) are fail-safe embodiments of the rotation speed detection circuit of the rotation control device according to the present invention, and FIGS. 2 (A) and 2 (B) are rotation control according to the present invention. Another fail-safe embodiment of the rotation speed detection circuit of the apparatus, FIG. 3 is a fail-safe embodiment of the power supply apparatus of the rotation control device according to the present invention, and FIG. 4 is the actuator of FIG. FIG. 5 is a perspective view of a portion, and FIG. 5 shows an embodiment of an engine generator device in which a fail safe relating to a rotation speed detection circuit and a power supply device of a rotation control device according to the present invention is used. In the figure, 1 is an engine generator, 2 is a rotation speed detection circuit, 3 is a voltage detection circuit, 4 is a fail-safe circuit, 5 is an automatic gain adjustment circuit, 6 is a PID regulator, 7 is an amplifier, and 8 is a PWM circuit. Part, 9 is an actuator, 10 is a power supply device, 11 is an fv converter, 12 is an abnormal signal detection circuit, 13 is a buffer amplifier, 14 and 15 are operational amplifiers, 16 is a diode, 17 is a variable resistor, 18, 19 is resistance, 20 is f
-V converter, 21 is an abnormal voltage detection circuit, 22 is a switch unit, 23 is a spring, 24 is a shaft, 25 is a throttle, 26 is a tube, 27 is a motor, 28 is a base, 29 is an anchor, and 30 is a horn. There is.

Claims (2)

[Claims] An engine generator comprising a governor control device, wherein a constant-speed rotation control of a prime mover is performed. In the governor control device, a voltage detection circuit for detecting the rotational speed of the prime mover by using a voltage and a rotational speed, respectively. A number detection circuit, a fail-safe circuit for giving priority to the detection signal of either the voltage detection circuit or the rotation number detection circuit and providing a rotation number detection signal, and detecting the weight of the load of the prime mover, An automatic gain adjustment circuit for changing the gain of the control system in accordance with the above, a PID adjuster for creating a control signal for PID control based on an output obtained from the automatic gain adjustment circuit, and a pulse width for the output of the PID adjuster A PWM circuit unit for converting the control signal into a control signal, an actuator for controlling the rotation of the prime mover in accordance with the PWM signal output from the PWM circuit unit, and a power supply device for supplying positive and negative bipolar power to each of the circuit units. , And above The rotation speed detection circuit compares the rotation speed detection signal of the fv converter for converting the detected rotation speed of the prime mover into a voltage and a predetermined reference voltage to determine the rotation speed. When an abnormality occurs in the abnormality signal detection circuit that detects an abnormality in the detection circuit system and the rotation speed detection circuit system, the prime mover apparently rotates at high speed based on the abnormality occurrence signal output from the abnormality signal detection circuit. A buffer that outputs the rotation speed detection signal when the rotation speed detection circuit system is operating, and amplifies the rotation speed detection signal output from the rotation speed detection circuit when no abnormality occurs in the rotation speed detection circuit system.
A rotation control device comprising an amplifier. 2. In a motor generator system including a governor control device and performing constant-speed rotation control of a prime mover, the governor control device includes a voltage detection circuit and a rotation detecting circuit for detecting the number of revolutions of the prime mover by a voltage and a number of revolutions, respectively. The number detection circuit, the fail-safe circuit that prioritizes the detection signal of either the voltage detection circuit or the rotation speed detection circuit as the rotation speed detection signal, and the weight of the load of the prime mover is detected. A gain automatic adjustment circuit that changes the gain of the control system accordingly, a PID adjuster that creates a PID control signal based on the output obtained from the gain automatic adjustment circuit, and a pulse width output of the PID adjuster. A control circuit for converting the control signal into a control signal, an actuator for controlling the rotation of the prime mover according to the PWM signal output from the PWM circuit section, and a power supply device for supplying positive and negative bipolar power supplies to the respective circuit sections. ， On top The rotation speed detection circuit compares the rotation speed detection signal of the fv converter for converting the detected rotation speed of the prime mover into a voltage and a predetermined reference voltage to determine the rotation speed. When an abnormality occurs in the abnormality signal detection circuit that detects an abnormality in the detection circuit system and the rotation speed detection circuit system, the prime mover apparently rotates at high speed based on the abnormality occurrence signal output from the abnormality signal detection circuit. A buffer that outputs the rotation speed detection signal when the rotation speed detection circuit system is operating, and amplifies the rotation speed detection signal output from the rotation speed detection circuit when no abnormality occurs in the rotation speed detection circuit system.
An amplifier, the actuator includes an abnormal voltage detection circuit that detects an abnormality of positive and negative bipolar voltages of the power supply device, a switch unit that controls the supply of power to the actuator by the abnormal voltage detection circuit, And a throttle position control mechanism for setting the throttle position of the prime mover so that a predetermined rotational speed is reached when the switch unit is turned off and the power supply from the power supply device to the actuator is cut off. A rotation control device characterized by: