JPS62165536A - Starting device for gas-turbine engine - Google Patents

Abstract

PURPOSE:To prevent the mulfunction of a controller for engine control, in the case where a gas-turbine engine is started by means of a starter motor, by causing the drive of the starter motor to stop when the battery voltage is not more than a reference voltage. CONSTITUTION:This starting device is provided with an engine starting control circuit 22, and the circuit 22 is provided with a comparator 28 for making a comparison between a reference voltage V1, which is set by means of a reference voltage generator 24, and the voltage V2 of a battery 13, which is detected by a battery voltage detector 26. In addition, said device is provided with a starter motor controller 30 for sending to the relay coil 20 of a starter relay 14 an engine starting signal, which is received from a controller 18 for controlling engine when V2>=V1, and H-level signal is given from the comparator 28 so that a thyristor SCR is caused to conduct. Hereby, the contact 16 is caused to close, and a starter motor 12 is driven. While, when V2<V1, the thyristor SCR is left in the nonconducting state, and the starting of engine is not carried out.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a starting device for a gas turbine engine, and particularly to a starting device for a gas turbine engine that starts the engine using a starter motor driven by an auxiliary battery. be.

[Background Art] Gas turbine engines are becoming increasingly useful as high-speed rotational drive sources used in generators, which are suitable as emergency power sources in areas where commercial power is not available or during power outages.

In such a gas turbine engine, until the desired rotational speed is obtained at the time of startup, that is, until the turbine output due to ignition and combustion in the combustor reaches a rotational speed that exceeds the horsepower consumption of the compressor, It is necessary to drive the engine with external power. A gas turbine engine starting device having a starter motor is generally used as this drive device, and the starter motor is driven by an auxiliary battery.

FIG. 3 shows a conventional gas turbine engine starting device.

A starter motor 12 is directly connected to the gas turbine engine 10 , and the starter motor 12 is connected to a battery 13 via a contact 16 of a starter relay 14 .

A starter switch SW is further connected to the battery 13, and this switch SW is connected to an engine control controller 18 that performs various controls such as sequence control of engine auxiliary equipment.
It is connected to the relay coil 20 of the starter relay 14 via.

In the operation up to the start of the gas turbine engine 10 by the conventional device, the starter switch SW is first turned on, and the engine controller 18 sends an engine start signal to the relay coil 20. Upon reception of this signal, the contact 16, which is normally open, becomes closed, and the starter relay 14
is in the on state. As a result, the starter motor 12 to which the voltage is applied starts driving, and the gas turbine engine 10 is started.

[Problems to be Solved by the Invention] However, in the conventional device described above, starting of the gas turbine engine 10 is always started when the starter switch SW is turned on, so the voltage of the battery VB is lower than the charging voltage. Various problems have occurred when the level has decreased due to a shortage.

In other words, sufficient voltage is not supplied to the starter motor 12, and the gas turbine engine 10 is rotated at a rotational speed (usually 20.5 m) where the turbine output exceeds the horsepower consumption of the compressor.
000 to 30,000 revolutions per minute), the gas turbine engine 10 cannot stand on its own, leading to ignition errors and fuel buildup within the engine, which requires an overhaul of the engine to remove this. There was a problem.

Furthermore, if the battery voltage significantly decreases, there is a problem in that the engine control controller 18, which performs sequence control of engine auxiliary equipment, fuel control, etc., malfunctions.

The present invention has been made in view of the problems with the conventional devices described above, and its purpose is to provide a starting device that does not start a gas turbine engine when the battery voltage has decreased due to insufficient charging. There is a particular thing.

Means for Solving Problem U] In order to achieve the above object, the gas turbine engine starting device according to the present invention includes a battery voltage detector, a reference voltage generator, and a device that compares the battery voltage with the reference voltage. An engine starting control circuit is provided that includes a comparator and a starter motor controller that controls switching of the starter motor to a suppressed or released state based on the comparator output, and the starter motor is not driven when the battery voltage is below a predetermined value. The feature is that the gas turbine engine is not started.

[Operation] By configuring as described above, the gas turbine engine is not started immediately when the starter switch is turned on, but the engine can be started only when the battery voltage is equal to or higher than a predetermined value.

That is, first, a reference voltage generator generates a predetermined value of the base Q necessary for reliable starting of the gas turbine engine.
A voltage is generated, and a comparator compares this voltage with a battery voltage divided to a desired value by a battery voltage detector.

Next, the comparator sends a signal according to the voltage comparison result to the starter motor controller, and the starter motor controller
=The starter motor is driven to start the gas turbine engine only when a signal indicating that the battery voltage is high is received.

This prevents the gas turbine engine from starting when the battery voltage is low due to insufficient charging, which prevents ignition errors and fuel accumulation in the engine due to the engine's inability to stand on its own, and roughly reduces the battery voltage. It is possible to prevent malfunctions of the engine control controller operated by the supply.

[Embodiment] FIG. 1 shows an overall configuration diagram of a preferred embodiment of the present invention,
Elements similar to those of the conventional device shown in FIG.

In this embodiment, the engine control controller 18 is not directly connected to the relay coil 20 of the starter relay 14 as in the conventional case, but is connected to an engine starting control circuit 22.
Connected to the relay coil via.

The engine start control circuit 22 compares the reference voltage with the battery voltage and sends an engine start signal from the engine controller 18 to the relay coil 20 to connect the contact 16 only when the battery voltage has reached a predetermined value. It drives the starter motor 12 and includes a reference voltage generator 24, a battery voltage detector 26, a comparator 28, and a starter motor controller 30.

The reference voltage generator 24 is composed of a current limiting resistor R1 and a Zener diode D connected to the output end of the starter switch SW, and a reference voltage 1 determined by the voltage across the Zener diode D is compared via a resistor R4. It is supplied to the inverting input terminal of the device 1c.

The battery voltage detector 26 is composed of a resistor R2 and a resistor R3 connected to the output terminal of the starter switch SW, and the voltage v2 of the battery 3 divided by these resistors is applied to the resistor R5.

It is supplied to the non-inverting input terminal of the comparator IC.

The resistors R4 and R5 are necessarily provided to prevent overcurrent from being supplied to the comparator 28.

The comparator 28 is comprised of a differential operational amplifier that can be used over a wide power supply voltage VCC range of 3 to 36 V, and compares the set reference voltage v1 with the divided battery voltage V.sub.1.

Then, as the voltage division ratio of resistors R2 and R3, when the battery voltage is VB, V2 obtained by V2-VB-R3/R2+R3 is V2≧V1, that is, when the battery voltage VB is higher than a predetermined value, the trubel signal is When V2 is less than Vl, that is, when the battery voltage VB is less than a predetermined value, a high level signal is outputted and supplied to the starter motor controller 30.

The starter motor controller 30 includes a thyristor SCR, and the output of the comparator 28 is supplied to the gate terminal 32 of the thyristor SCR via an integrating and current limiting circuit consisting of resistors R6, R7 and a capacitor C. There is.

The thyristor SCR has its gate terminal 32 connected to the resistor R7, its anode terminal connected to the engine control controller 18, and its cathode terminal connected to the relay coil 20.

Resistor R6 and capacitor C are provided to provide a constant time constant and remove noise etc., and resistor R7 is provided to prevent overcurrent from being supplied to the gate terminal of thyristor SCR. .

The thyristor SCR operates only when the output signal of the comparator 28 supplied to the gate terminal 32 via the resistors R6, R7 and the capacitor C is a torque signal (when the gate signal is ON), that is, when the battery voltage is higher than a predetermined value. It becomes conductive and sends an engine start signal sent from the engine control controller 18 to the relay coil 20. Due to this.

Contact 16 of starter relay 14 is connected, voltage from battery 13 is applied to starter motor 12, starter motor 12 starts driving, and gas turbine engine 10 (not shown) is started.

On the other hand, the output signal of the comparator 28 is torbel (gate signal O
FF>, the thyristor SCR remains non-conductive, the engine start signal is not sent to the relay coil 20, and the engine is not started.

FIG. 2 shows the relationship between the reference voltage V1 and the divided battery voltage V2.

The vertical axis shows the reference voltage, and the horizontal axis shows the voltage of the battery VB. If V2 is lower than Vl when the engine starts, the output of the comparator 28 becomes the trubel signal @ (gate signal 0FF), and the thyristor SCR becomes non-conductive. state. Further, if V2 is higher than vl when the engine is started, the output of the comparator 28 becomes a torque signal and the goo1~ signal is applied to the thyristor SCR, indicating that the thyristor SCR is in a conductive state.

The thyristor SCR has a characteristic that once the -W gate signal is applied and it becomes conductive, the thyristor SCR can continue to conduct electricity even if the gate signal is turned off. This is suitable for this embodiment of discrimination.

As described above, according to this embodiment, when the starter switch SW is turned on, the engine starting control circuit 22 is activated first before the starter relay 14 is activated. Therefore, even if the starter switch SW is turned on, the gas turbine engine is not always started, but the starter motor 12 is started only when the voltage of the battery VB is equal to or higher than a predetermined value that can reliably start the engine. It is possible to drive the engine and start the engine.

[Effects of the Invention] As explained above, according to the present invention, when the battery voltage is below a predetermined value, that is, when the battery voltage does not reach a sufficient voltage to reliably start the gas turbine engine due to insufficient charging, The engine will not start, so
This has the effect that it is possible to prevent the gas turbine engine from being unable to stand on its own due to insufficient charging of the battery, or from ignition errors, etc., and it is also possible to prevent malfunctions of the engine control controller caused by insufficient supply voltage.

[Brief explanation of drawings]

Fig. 1 is an overall B'i diagram showing a preferred embodiment of the present invention, Fig. 2 is a characteristic diagram showing the relationship between the reference voltage V1 and the divided battery voltage v2, and Fig. 3 is a conventional gas 1 shows a configuration diagram of a turbine engine starting device. 12...Starter motor 14...Starter relay 16...Contact 18...Engine control controller 20...
・ Relay coil 22 ... Engine starting control circuit 24 ... Reference voltage generator 26 ... Discrepancy voltage detector 28 ... Comparator 30 ... Starter motor controller 32 ... Goo 1~terminal

Claims (1)

[Scope of Claim] A gas turbine engine starting device that starts the engine by a starter motor driven by voltage from a battery, comprising: a battery voltage detector, a reference voltage generator, and a generator that converts the battery voltage to the reference voltage generator. a comparator that compares the voltage with a reference voltage generated by the battery, and a starter motor controller that controls the starter motor to be suppressed or released according to the comparison output, and controls the starter motor when the battery voltage is below a predetermined value. A starting device for a gas turbine engine, characterized in that the gas turbine engine is not started as a suppressed state.