JPH01130023A - Rotation control device - Google Patents

Abstract

PURPOSE:To restrain always a prime mover from rotation increase and enable it to be controlled in the direction of safe rotational frequency by providing a fail-safe operation when any abnormalities take place in a rotational frequency detecting circuit system and power supply system. CONSTITUTION:The voltage detecting signal of a voltage detecting circuit 3 as a rotational frequency detecting signal is given preference over others, and when any abnormalities take place in a voltage detecting circuit 3 system, the rotational frequency detecting signal of a rotational frequency detecting circuit 2 as a rotational frequency detecting signal is selected by a fail-safe circuit 4. When any abnormalities also take place in a rotational frequency detecting circuit 2 system, an abnormality signal detecting circuit 12 sends the abnormality occurrence signal to a buffer amplifier 13, and by fictionizing apparently that a starting generator 1 is rotated with abnormally high speed, a prime mover is prevented from the shift to the abnormally high rotation, i.e. runaway, in control systems of an automatic gain regulating circuit 5 and others.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention is applied to a seven-rotation control device, particularly when an abnormal state occurs in a control system that controls the rotation speed of a prime mover at a constant speed.

This invention relates to fail-safe control of the rotation speed so that control of the prime mover to high-speed rotation is always denied.

(Prior art) In a conventional three-motor generator system, a governor control device is provided to keep the rotation speed of the prime mover constant, and the governor control device maintains the rotation speed of the prime mover constant even if the power generation a load fluctuates. An automatic control system is used to maintain the generator frequency constant.

Traditionally, mechanical governor control devices have been used, but recently electronic ones have come into use.

The electronic governor control device used in conventional motor generator equipment is 1. For example, failure of the rotation speed detection circuit system that detects the rotation speed of the prime mover, or each circuit part that makes up the electronic governor control device If an abnormality occurs in the control system due to a failure in the power supply system that supplies power, there are no measures in place to deal with this, and the rotation of the prime mover will stop spontaneously. I expected it to work in that direction.

(Problem to be solved by the invention) As in the past, when a failure occurs in the rotation speed detection circuit system, power supply device, etc. and an abnormal state occurs in the control system, the rotation speed of the prime mover does not necessarily operate in the direction of stopping. Not necessarily.

For example, if an abnormal situation occurs in the rotation speed detection circuit system and one rotation speed detection signal stops, it will be mistaken as an abnormal decrease in one rotation, and if a control signal to increase the rotation speed is output from the control system, the prime mover will The number of rotations increases and the engine goes out of control. Further, even if there is a failure in the power supply system, the control system may output a control signal to increase the rotational speed of the prime mover due to the failure in the power supply system.

Therefore, in the 9 engine generator system, if an abnormality occurs in the rotation speed detection circuit system or power supply system.

It is desired to realize a fail-safe system that always operates to suppress abnormal increases in the rotational speed of the prime mover.

The present invention has been made in view of the above points, and is designed to prevent failures and prevent factors that increase the rotational speed of the prime mover due to some cause, particularly an abnormality in the rotational speed detection circuit system and power supply system. It is an object of the present invention to provide a rotation control device that can prevent runaway of five prime movers by providing a safety means.

(Means for Solving the Problems) Therefore, the rotation control device of the present invention is applicable to a governor control device in a motor generator device that includes a governor control device and performs constant speed rotation control of five prime movers.

A voltage detection circuit and a rotation speed detection circuit that respectively detect the rotation speed of the prime mover in terms of voltage and rotation speed, and a fail that prioritizes the detection signal of either the voltage detection circuit or the rotation speed detection circuit and uses it as the rotation speed detection signal.・Detects the safe circuit and the weight of the motor load.

an automatic gain adjustment circuit that changes the gain of the control system according to the weight; a PID adjuster that creates a control signal for PID control based on the output obtained from the automatic gain adjustment circuit; A PWM circuit unit that converts the output into a pulse width control signal, an actuator that controls the rotation of the prime mover according to the PWM signal output by the PWM circuit unit, and a power source that supplies positive and negative bipolar power to each of the above circuit units. The rotation speed detection circuit further includes an f-v converter that converts the detected rotation speed of the prime mover into a voltage.
an abnormality signal detection circuit that compares the rotation speed detection signal of the ff f 'converter with a predetermined reference voltage and detects an abnormality in the rotation speed detection circuit system;

When an abnormality occurs in the rotation speed detection circuit system, based on the abnormality occurrence signal output from the abnormality signal detection circuit, the apparent rotation speed detection signal when the prime mover is rotating at high speed is outputted. It is characterized by being equipped with a buffer amplifier that directly amplifies the rotation speed detection signal output from the rotation speed detection circuit when no abnormality has occurred in the rotation speed detection circuit system. For the governor control device in a motor generator device that performs high-speed rotation control.

A voltage detection circuit and a rotation speed detection circuit that respectively detect the rotation speed of the prime mover in terms of voltage and rotation speed, and a fail that prioritizes the detection signal of either the voltage detection circuit or the rotation speed detection circuit and uses it as the rotation speed detection signal.・Detects the safe circuit and the weight of the motor load.

an automatic gain adjustment circuit that changes the gain of a control system according to the weight; a PID regulator that creates a control signal for PID control based on the output obtained from the automatic gain adjustment circuit; A PWM circuit section that converts the output of the PWM circuit section into a pulse width control signal, an actuator that controls the rotation of the prime mover according to the PWM signal output from the PWM circuit section, and a bipolar power supply of positive and negative polarity to each of the above circuit sections. The rotation speed detection circuit further includes an f-v converter that converts the detected rotation speed of the prime mover into a voltage;
- An abnormal signal detection circuit that compares the rotation speed detection signal of the v converter with a predetermined reference voltage and detects an abnormality in the rotation speed detection circuit system.

When an abnormality occurs in the rotation speed detection circuit system, based on the abnormality occurrence signal output from the abnormality signal detection circuit, the apparent rotation speed detection signal when the prime mover is rotating at high speed is outputted. When there is no abnormality in the rotation speed detection circuit system, the actuator is equipped with a buffer amplifier that amplifies the rotation speed detection signal output from the rotation speed detection circuit as it is, and the actuator has two polarities, positive and negative, of the power supply device. an abnormal voltage detection circuit that detects an abnormality in voltage; a switch unit that controls power supply to the actuator by the abnormal voltage detection circuit; and when the switch unit is turned off, power supply from the power supply device to the actuator is cut off. The present invention is characterized in that it is equipped with a throttle position side control 711m that sets the position of the throttle of the prime mover so that the rotation speed reaches a predetermined number of revolutions when the engine is rotated. An embodiment of the present invention will be described below with reference to the drawings.

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

Before explaining each fail-safe of the rotation control device according to the present invention shown in FIGS. 1 to 4, an outline of how the prime mover in the motor generator is automatically controlled by the governor control device will first be explained using FIG. 5. Let me explain.

In FIG. 5, numeral 1 is a motor 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 PIDUR regulator, 7 is an amplifier, 8 is a PWM circuit section, 9 is an actuator, and 10 is a power supply device.

From the prime mover or generator side of the motor generator 1, if the rotational fluctuation of the motor generator 1 due to load fluctuation or some other cause is 1.
The rotation speed detection circuit 2 and the voltage detection circuit 3 individually detect the rotation speed. A rotation speed detection signal detected by the rotation speed detection circuit 2.

The voltage detection signal detected by the voltage detection circuit 3 is outputted to the fail-safe circuit 4 by either one of the detection signals 1
For example, the voltage detection signal is preferentially selected as the rotation speed detection signal of the motor generator 1.

The other rotation speed detection signal is such that when an abnormality occurs in the voltage detection circuit 3 system, the rotation speed detection signal obtained from the rotation speed detection circuit 2 replaces the voltage detection signal obtained from the voltage detection circuit 3. Fail-safe circuit 4 as a number detection signal
It is designed to prevent the occurrence of abnormal rotation such as runaway of the prime mover. The automatic gain adjustment circuit 5 detects the lightness or weight of the current load from the output of the motor generator 1.

The gain of the control system is determined according to the weight of the load.

Then, in order for the gain of the system to be set to this determined value,
a detection signal selected from the fail-safe circuit 4;
That is, the voltage detection signal is amplified.

Subsequently, the PID adjuster 6 minimizes the residual deviation between the target value and the final value, that is, the steady-state error, and changes the responsiveness into a control signal that should quickly follow rotational fluctuations. The control signal is amplified by an amplifier 7.

Furthermore, the control signal is converted into a PWM signal in the PWM circuit section 8. The actuator 9 of the rotary encoder is controlled by the PWM signal, and the rotation speed of the prime mover in the power generator 8!1 is controlled to be constant according to the angle output by the actuator. A bipolar power supply voltage of positive and negative polarity is supplied from the power supply device 10 to each circuit section. The actuator 9 is operated by the positive and negative voltages supplied from the power supply 10.
The encoder is rotated forward or backward according to the pulse width of the PWM signal to obtain a forward and reverse control angle signal that keeps the rotational speed of the prime mover constant.

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

In FIG. 1 (AL (B), 11 is an f-v converter, 12 is an abnormal signal detection circuit, 13 is a buffer amplifier, 14.15 is an operational amplifier, 16 is a diode, and 17 is a
represents a variable resistance, and 18.19 represents a resistance.

In FIG. 1(A), the f-v converter 11 used has an output characteristic in which the output voltage is directly proportional to the input frequency. That is, when the rotation speed of the motor generator 1 is low, its output voltage is low.

The motor generator 1 used has a characteristic that its output voltage increases as the rotational speed of the motor generator 1 increases.

Now, the signal input to the f-v converter 11 is interrupted due to a failure of the rotation speed detection section that detects the rotation speed of the motor generator 1, and the output voltage of the f-v converter 11, that is, the rotation speed detection signal, is interrupted. When the rotation speed detection signal has abnormally decreased, the operational amplifier 14 compares the abnormally decreased rotation speed detection signal voltage with a reference voltage predetermined by the variable resistor 17, and the operational amplifier 14 outputs rLJ. Therefore, an abnormality occurrence signal is sent to the buffer amplifier 13 via the diode 16, and the inverting input terminal of the operational amplifier 15 is set to rLJ. As a result, the operational amplifier 15 outputs rHJ, and apparently the rotation speed detection signal when the rotation speed of the upper motor generator 1 is rotating at high speed is sent to the next stage gain automatic via the fail-safe circuit 4. The signal is sent to the adjustment circuit 5. The control system below the automatic gain adjustment circuit 5 assumes that the prime mover is rotating at high speed and automatically controls the rotation in a direction to reduce the rotation. Therefore, when an abnormal situation occurs in the rotation speed detection circuit 2 system, an abnormality occurrence 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. A fail-safe operation is activated to prevent the prime mover from running out of control. In addition, under normal conditions.

The variable resistor 17 is set so that the voltage of the rotation speed detection signal output from the converter 11 is higher than the base voltage of the variable resistor 17, so the output of the operational amplifier 14 is rHJ. diode 16 is reverse biased, and buffer amplifier 13 operates as a normal amplifier.

As explained in FIG. 5, the voltage detection signal of the voltage detection circuit 3 is given priority as the rotation speed detection signal, and when an abnormality occurs in the voltage detection circuit 3 system, the rotation speed detection signal of the rotation speed detection circuit 2 is The fail-safe circuit 4 selects the rotation speed detection signal as the rotation speed detection signal.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. By pretending that the upper engine generator l is apparently rotating at an abnormally high speed, the control system of the automatic gain adjustment circuit 5 or lower prevents the prime mover from shifting to abnormally increasing rotation 5, that is, from running out of control. It looks like this.

In FIG. 1(B), the input terminals of the operational amplifier 14 in the abnormal signal detection circuit 12 are exchanged, and the reference voltage of the variable resistor 17 is input to the non-inverting input terminal of the operational amplifier 14, and r-v to the inverting input terminal of operational amplifier 14.
The output voltage of the converter 11, that is, the rotation speed detection signal is inputted. Then, the polarity of the diode 16 is connected in the opposite direction to that in FIG.
In a configuration where the same operation as that in figure (A) is performed, “C
There is. Therefore, since the operation in FIG. 1(B) is the same as that in FIG. 1(A) above, the explanation thereof will be omitted.

A configuration using an f-v converter 11 whose output characteristics are inversely proportional is shown in FIGS. 2(A) and 2(B').

In FIGS. 2(A) and (B), numerals 12 to 19
corresponds to those in FIGS. 1(A) and 1(B), and reference numeral 20 represents an f-v converter.

In FIG. 2(A), the f-v:y inverter 20 has an output characteristic in which the output voltage is inversely proportional to the human power frequency. That is, when the rotation speed of the motor generator 1 is low, its output voltage is high.

The motor generator 1 used has a characteristic that its output voltage decreases as the rotational speed of the motor generator 1 increases.

The signal input to the f-v converter 20 is interrupted due to a failure of the rotation speed detection unit that detects the rotation speed from the 2-move power generation IT, and the output voltage of the f-v converter 20, that is, the rotation speed detection signal is abnormal. When the rotation speed detection signal has increased abnormally, the voltage of this abnormally increased rotation speed detection signal and a reference voltage predetermined by the variable resistor 17 are compared by the seven operational amplifier 14, and the operational amplifier 14 outputs rHJ. Therefore, an abnormality occurrence signal is sent to the buffer amplifier 13 via the diode 16, and the inverting input terminal of the operational amplifier 15 is set to rHJ. As a result, the operational amplifier 15 outputs rLj,
A rotation speed detection signal when the rotation speed of the upper motor generator 1 is apparently rotating at a high speed is sent to the next stage automatic gain adjustment circuit 5 via the fail-safe circuit 4. The control system below the automatic gain adjustment circuit 5 assumes that the prime mover is rotating at high speed and automatically controls the rotation in a direction to reduce the rotation.

Therefore, when an abnormal situation occurs in the rotation speed detection circuit 2 system,
An abnormality occurrence 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, a fail-safe operation is activated and runaway of the prime mover is prevented. In addition, under normal conditions.

The voltage of the rotation speed detection signal output from the f-v converter 20 is lower than the reference voltage of the variable resistor 17 (the variable resistor 17 is set so that it is lower than the reference voltage of the variable resistor 17, so the operational amplifier 1
The output of 4 is rLJ and diode 16 is reverse biased,
The buffer amplifier 13 operates as a normal amplifier.

In FIG. 2(B), the input terminals of the operational amplifier 14 in the abnormal signal detection circuit 12 are exchanged, and the reference voltage of the variable resistor 17 is input to the non-inverting input terminal of the operational amplifier 14, and r-v to the inverting input terminal of operational amplifier 14.
The output voltage of the converter 20, that is, the rotation speed detection signal is input. The polarity of the diode 16 is connected in the opposite direction to that shown in FIG. 2(A), so that the same operation as that shown in FIG. 2(A) is performed. Therefore, since the operation in FIG. 2(B) is the same as that in FIG. 2(A) above, the explanation thereof will be omitted.

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

25 represents a throttle, and 26 represents a pipe.

When an abnormality occurs in either of the positive and negative bipolar voltages supplied from the source device 10 to each circuit section, the abnormal voltage detection circuit 21, which detects the normality of these positive and negative bipolar voltages, detects the abnormal voltage. do. For example, the abnormal voltage detection circuit 21 has two predetermined reference voltages, high and low, and
When the positive and negative bipolar voltages supplied from the switch section 22 are higher and lower than these reference voltages, a control signal is output and the contact of the switch section 22 is turned off. This allows power supply 1
The power supply from 0 to the actuator 9 is cut off, and the actuator 9 becomes free.

The actuator 9 is adapted to control 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 position detection by a rotary encoder (not shown).

The motor 27 also includes an elastic member fixed to an anchor 29 fixed to the heath 28 and to the shaft 24 of the motor 27.

For example, a spring 23 is provided, and when the actuator 9 is in the free state, the 8 motor 27
is also now free.

When the motor 27 becomes free, the spring 2
The horn 3 is fixed to the shaft 24 by the elastic force of 3.
0 is rotated, and the opening/closing angle of the throttle 25 is controlled via the horn 30. Factory motor 27
When the is in a free state, the opening/closing angle of the throttle 25 is set by the elastic force of the spring 23 to the position 5 where the rotation speed of the prime mover becomes a predetermined rotation speed, for example, the position 1 where the prime mover is at the no-load rated rotation speed. When the motor 27 is placed in a free state, the rotational speed of the prime mover shifts toward a predetermined rotational speed, that is, the no-load rated rotational speed, and does not increase beyond that.

Therefore, when an abnormality occurs in the positive and negative bipolar voltages supplied by the power supply device 10, the abnormal voltage detection circuit 21 turns off the contacts of the switch section 22, and the actuator 9. That is, the motor 27 becomes free, and the elastic force of the spring 23 controls the throttle 25 to a position where the rotational speed of the prime mover becomes the no-load rated rotational speed, and the power supply unit 210
Fail function that prevents the prime mover from running out of control even in the event of a system failure.
Safe works.

In FIG. 4, a horn 30 is fixed to the shaft 24 of the motor 27, and the throttle 25 is connected via the horn 30.
Although the shaft 24 of the motor 27 can be directly connected to the throttle 25, the horn 30 is not needed.

Also, replace the abnormal voltage detection circuit 21 in FIG.

PW from PWM circuit unit 8 input to actuator 9
It may be configured such that the contact of the switch section 22 is turned off when the normality of the M signal is detected and the abnormality of the XIPWM signal is detected. With this configuration, the power supply device 1
Runaway of the prime mover due to failure of the 0 system can also be suppressed.

(Effects of the Invention) As explained above, 1. According to the present invention, 2. When an abnormal situation occurs in the rotation speed detection circuit system or the power supply system.

The fail-safe operates and always suppresses the increase in rotation of the prime mover and controls the rotation speed of the prime mover toward a safe rotation speed. The control circuit and mechanism are simple, highly reliable, and can be manufactured at low cost.

For fail-safe regarding the rotation speed detection circuit, r
- It is only necessary to insert an abnormal signal detection circuit between the v converter and the buffer amplifier.

Its versatility.

Further, in the case of a fail-safe system related to a power supply device, the rotational speed of the prime mover in the event of an abnormality can be freely set to any rotational speed by setting a spring, and the setting can be easily performed. When starting the prime mover, the prime mover can be started smoothly up to this set rotation speed without any conditions.

[Brief explanation of the drawing]

1(A) and (B) are configurations of a fail-safe embodiment of the rotation speed detection circuit of the rotation control device according to the present invention, and FIGS. 21m (A) and (B) are the rotation control device according to the present invention. FIG. 3 shows another fail-safe embodiment of the configuration of the rotation speed detection circuit of the present invention, and FIG. 4 shows the actuator section of FIG. 3. The perspective view of FIG. 5 shows an embodiment of the configuration of a motor generator device in which a fail-safe regarding the rotation speed detection circuit and power supply device of the rotation control device according to the present invention is used. In the figure, 1 is a motor generator and 2 is a rotation speed detection circuit. 3 is a voltage detection circuit, and 4 is a fail-safe circuit. 5 is an automatic gain adjustment circuit, 6 is a PID adjuster, 7 is an amplifier, 8 is a PWM circuit section, and 9 is an actuator. 10 is a power supply device, 11 is an r-v converter, 12 is an abnormal signal detection circuit, and 13 is a buffer amplifier. 14.15 is an operational amplifier, 16 is a diode. 17 is a variable resistor, 18 and 19 are resistors, 20 is a -V converter, 21 is an abnormal voltage detection circuit, 22 is a switch section,
23 is a spring, 24 is a shaft. 25 is a throttle, 26 is a pipe, and 27 is a motor. 28 represents a base, 29 represents an anchor, and 30 represents a horn.

Claims (1)

[Scope of Claims] 1) In a motor generator device that includes a governor control device and performs constant speed rotation control of the prime mover, the governor control device includes:
A voltage detection circuit and a rotation speed detection circuit that respectively detect the rotation speed of the prime mover in terms of voltage and rotation speed, and a fail that prioritizes the detection signal of either the voltage detection circuit or the rotation speed detection circuit and uses it as the rotation speed detection signal. - A safe circuit, an automatic gain adjustment circuit that detects the weight of the load on the prime mover and changes the gain of the control system according to the weight, and a PID control based on the output obtained from the automatic gain adjustment circuit. A PID regulator that creates a control signal, a PWM circuit unit that converts the output of the PID regulator into a pulse width control signal, and an actuator that controls the rotation of a prime mover in accordance with the PWM signal output from the PWM circuit unit. , a power supply device that supplies positive and negative bipolar power to each of the circuit sections, and the rotation speed detection circuit further includes an f- for converting the detected rotation speed of the prime mover into a voltage.
an abnormality signal detection circuit that compares the rotation speed detection signal of the f-v converter with a predetermined reference voltage and detects an abnormality in the rotation speed detection circuit system; When an abnormality occurs, a rotation speed detection signal when the prime mover is apparently rotating at high speed is output based on the abnormality occurrence signal output from the abnormality signal detection circuit, and an abnormality occurs in the rotation speed detection circuit system. A rotation control device comprising: a buffer amplifier that directly amplifies the rotation speed detection signal output from the rotation speed detection circuit when the rotation speed detection circuit is not in use. (2) In a motor generator device that is equipped with a governor control device and performs constant speed rotation control of the prime mover, the governor control device is equipped with a voltage detection circuit and rotation speed detection circuit that respectively detect the rotation speed of the prime mover in terms of voltage and rotation speed. a 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 detects the weight of the load on the prime mover and An automatic gain adjustment circuit that changes the gain of the control system, a PID adjuster that creates a control signal for PID control based on the output obtained from the automatic gain adjustment circuit, and a pulse width control for the output of the PID adjuster. A PWM circuit unit that converts into a signal, an actuator that controls the rotation of the prime mover according to the PWM signal output by the PWM circuit unit, and a power supply device that supplies positive and negative bipolar power to each of the circuit units, and further The rotation speed detection circuit has an f
-v converter, an abnormal signal detection circuit that compares the rotation speed detection signal of the f-v converter with a predetermined reference voltage and detects an abnormality in the rotation speed detection circuit system, and the rotation speed detection circuit system. When an abnormality occurs in the rotation speed detection circuit, a rotation speed detection signal when the prime mover is apparently rotating at high speed is output based on the abnormality occurrence signal output from the abnormality signal detection circuit, and the rotation speed detection circuit system detects the abnormality. The actuator is equipped with a buffer amplifier that directly amplifies the rotation speed detection signal output from the rotation speed detection circuit when the rotation speed detection circuit is not generated.
an abnormal voltage detection circuit that detects an abnormality in the positive and negative bipolar voltages of the power supply device; a switch section that controls power supply to the actuator by the abnormal voltage detection circuit; A rotation control device comprising: a throttle position control mechanism that sets the position of a throttle of a prime mover so that a predetermined rotation speed is achieved when power supply to the actuator is cut off.