JPH0627810Y2 - Idle control device for gas turbine engine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to a rotational speed control device for a gas turbine engine, and more particularly to an idle control device for a two-shaft gas turbine engine mounted on an automobile.

[Conventional technology]

Since the twin-shaft gas turbine engine has only (1) rotary motion,
(2) Since it is a continuous-combustion engine, it can be used for various types of combustion such as kerosene and methanol as well as gasoline and light oil. (3) Torque characteristics suitable for automobiles with high low-speed torque Since it has the features such as having an engine, it has been studied in recent years for practical use as an automobile engine.

FIG. 4 shows an example of a general configuration of a conventional two-shaft gas turbine engine mounted on an automobile with an automatic transmission.

In the figure, C is a compressor, HE is a heat exchanger, CC is a combustor, CT is a compressor turbine, and the compressor C and the compressor turbine CT are directly connected by a rotary shaft,
Fuel is supplied to the combustor CC via the actuator A1. Intake air (hereinafter referred to as intake air) is compressed by compressor C
Is heated in the heat exchanger HE, mixed with fuel in the combustor CC and burned, and the combustion gas rotates the compressor turbine CT. This compressor turbine CT
The compressor C and the compressor C may be collectively referred to as a gas generator GG, and the rotation speed of the compressor turbine CT affects the compression degree of the compressor C. The combustion gas that drives the compressor turbine CT drives the power turbine (output turbine) PT through the variable nozzle VN that is adjusted by the actuator A2, and then passes through the heat exchanger HE to be discharged as exhaust gas to the atmosphere.

The gas generator GG is started by rotating a front gear F / G provided on the rotary shaft of the compressor C by a starter SM with a built-in clutch.

The above is the configuration of the two-shaft gas turbine GT, and the rotation of the power turbine PT is reduced by the reduction gear R / G and transmitted to the automatic transmission A / T, and after being converted to the number of rotations according to the shift state, the difference is generated. It is transmitted to the wheels W via the dynamic gear D. In addition, an auxiliary machine AX such as a generator or a compressor for air conditioning equipment is connected to the rotary shaft of the reduction gear R / G.
These auxiliary machines AX are also driven by the rotation of PT.

Note that the actuator A1 supplies fuel to the combustor CC according to a command from the control circuit CONT, and the actuator A2 adjusts the opening α _s of the variable nozzle VN according to a command from the control circuit CONT, and then from the compressor turbine CT to the power turbine PT. Change the passage area of the combustion gas that flows in. As a result, if the number of revolutions of the compressor turbine CT is the same N ₁ , the pressure of the combustion gas is changed and the number of revolutions N ₃ of the power turbine PT is changed by adjusting the opening α _s of the variable nozzle VN. Therefore, the control circuit CONT performs control to reduce the opening degree α _s of the variable nozzle VN when the rotation speed N ₃ of the power turbine PT decreases. Therefore, the opening degree of the accelerator pedal and the engine operating state parameters from a sensor (not shown) are input to the control circuit CONT. Based on these information, the control circuit CONT operates the actuators A1, A1 according to the operating state of the engine. A
Drive the two.

Further, generally, the intake pressure at the position in FIG. 4 is P ₃ , and the temperature at the position is T ₄ , so that the subscripts attached to the intake pressure P and the temperature T are the positions of the numbers circled. The intake pressure P and the temperature T are shown.

In such a two-shaft gas turbine engine, during idling of the engine such as when the vehicle is stopped, the rotational speed of the output turbine PT decreases due to the load of auxiliary equipment such as an alternator, a compressor for air conditioning equipment, or an oil pump. If the rotation speed of the machine AX becomes too low, the control circuit CONT detects it and increases the rotation speed of the compressor turbine CT of the gas turbine engine, thereby increasing the rotation speed of the output turbine PT that drives the auxiliary machine AX. I was trying to improve my idol.

However, if the idle-up is performed only by increasing the fuel supply flow rate Gf to the combustor CC in this way, not only the output of the output turbine PT but also the output of the compressor turbine CT is increased overall, resulting in an efficient operation. Is useless for.

Therefore, during idle operation of the two-shaft gas turbine engine,
The present applicant has proposed that the fuel flow rate Gf is increased, the opening degree α _s of the variable nozzle VN is reduced, and the rotation speed N ₁ of the compressor turbine CT is kept constant while the rotation speed of the power turbine PT is increased. There is. That is, a method of closing the variable nozzle VN by the fuel flow rate Gf increased during the idle operation and increasing the rotation speed N ₃ of the output turbine PT without increasing the rotation speed N ₁ of the compressor turbine CT has been submitted by the applicant. (See JP-A-62-214237).

[Problems to be solved by the device]

However, this method uses the load of the automatic transmission A / T and the auxiliary equipment A.
This is true when the horsepower consumption of X, electric power, that is, the load of the output turbine PT is extremely small, and is not true when the load of the output turbine PT is large. This is because if the load of the output turbine PT is large and the opening degree α _s of the variable nozzle VN is made too small, the combustion gas temperature T _{6 at} the outlet of the compressor turbine CT may exceed the allowable value and the engine is melted and damaged. Because there is a fear.

An object of the present invention is to provide an output turbine while maintaining the engine speed within the idle speed range even when the engine load is increased by driving an auxiliary machine of the engine during idle operation of the conventional two-shaft gas turbine engine. An object of the present invention is to provide an idle control device for a gas turbine engine that can increase the number of revolutions of the engine and smoothly drive an auxiliary machine without melting and damaging the engine.

[Means for Solving the Problems]

The structure of a two-shaft gas turbine engine of the present invention which achieves the above-mentioned object is shown in FIG. The idle control device of the gas turbine engine of the present invention burns the intake air compressed by the compressor and heated by the heat exchanger by the combustor, drives the compressor turbine directly connected to the compressor by this combustion gas, and passes through the variable nozzle. In a two-shaft gas turbine engine configured to drive an output turbine connected to a load with the subsequent combustion gas, and then perform heat exchange with a heat exchanger, an idle state detection means 1 for detecting an idle state of the engine. An output rotation speed detection means 2 for detecting the rotation speed of the output shaft of the output turbine, a combustion gas temperature detection means 3 for detecting the temperature of the combustion gas on the downstream side of the output turbine, and an engine in an idle state and the output shaft First control means 4 for opening the opening of the variable nozzle to a predetermined value when the number of revolutions is less than a predetermined value and the temperature of the combustion gas is a predetermined value or more; When the engine is idle, the output shaft speed is less than a predetermined value, and the combustion gas temperature is less than a predetermined value, the variable nozzle opening is closed to a predetermined value, or the compressor turbine speed is set to a predetermined value. Second control means for increasing the speed, and when the engine is in the idle state and the rotation speed of the output shaft is above a predetermined value, the rotation speed of the compressor turbine is reduced to a predetermined value or the opening of the variable nozzle is opened to a predetermined value. Third
The control means 6 of FIG.

[Action]

According to the revolution control device of the gas turbine engine of the present invention,
When it is detected that the rotation speed N ₃ of the output shaft of the output turbine falls below the allowable minimum value N _3min during the idling state of the engine, first, the output shaft of the output shaft is adjusted by adjusting the opening α _s of the variable nozzle VN. The rotation speed N ₃ of the output shaft is restored by increasing the rotation speed N ₃ and then the rotation speed N ₁ of the compressor turbine CT. On the contrary, when the rotation speed N ₃ of the output shaft exceeds the allowable value N _3max at the time of idling, first, the rotation speed N ₁ of the compressor turbine CT is reduced, and then,
By adjusting the opening α _s of the variable nozzle VN, the rotation speed N of the output shaft
Reduce ₃ .

〔Example〕

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 2 shows the configuration of an embodiment of the two-shaft gas turbine engine of the present invention mounted on a vehicle with an automatic transmission, and the same components as the two-shaft gas turbine engine shown in FIG. Are denoted by the same reference numerals (symbols). Also,
In the same manner as described above, the intake pressure P in FIG. 2 is P ₃ and the temperature at the position is T ₄ , so that the intake pressure P
The subscripts attached to the temperature T and the temperature T indicate the intake pressure P and the temperature T at the positions of the numbers circled.

In the figure, GT is a gas turbine, and this gas turbine
Front gear F / G to which fuel pump, oil pump, starter, etc. are connected to GT, compressor C, heat exchanger HE, combustor CC, compressor turbine CT directly connected to compressor C by rotary shaft, variable nozzle VN, power turbine (Output turbine) PT, reduction gear R / G, etc.

In the two-shaft gas turbine engine configured as described above, the intake air is compressed by the compressor C, heated by the heat exchanger HE, mixed with the fuel by the combustor CC, and burned. Rotate the compressor turbine CT. The combustion gas that drives the compressor turbine CT drives the output turbine PT via the variable nozzle VN, and then passes through the heat exchanger HE to become exhaust gas, which is discharged to the atmosphere. A1 is the combustor CC
An actuator equipped with a metering valve for supplying fuel to A2, A2 is an actuator for adjusting the opening of the variable nozzle VN.

An automatic transmission A / T is connected to the reduction gear R / G of the gas turbine GT, and the rotation of the power turbine PT of the gas turbine GT is reduced by the reduction gear R / G and transmitted to the automatic transmission A / T. Through the built-in torque converter and transmission mechanism, the number of rotations is converted into the number of rotations corresponding to the shift state to be an axle drive output, and the drive wheels are rotated via a differential gear (not shown). A lockup clutch may be provided in the torque converter, and an auxiliary machine AX such as a compressor for a generator or an air conditioner is connected to the rotation shaft of the reduction gear R / G, and the power turbine PT These accessories AX are also driven by rotation.

The control circuit 10 for controlling the gas turbine GT and the automatic transmission A / T includes an input interface INa for analog signals,
Analog that digitally converts the signals from the input interface INd for digital signals and the input interface INa −
There are a digital converter A / D, a central processing unit CPU, a random access memory RAM, a read-only memory ROM, an output circuit OUT, etc., which are connected by a bus line 11.

Further, in the two-shaft gas turbine engine, a temperature sensor ST ₀ that detects the atmospheric temperature, a rotation speed sensor SN ₁ that detects the rotation speed N ₁ of the gas generator GG, and a temperature that detects the outlet temperature T ₃ of the compressor C. sensor ST _3, the temperature sensor ST ₃₅ that detects the outlet temperature T ₃₅ of the heat exchanger HE of intake, the temperature sensor ST ₆ that detects the inlet temperature of the heat exchanger HE of the exhaust side, through the speed reduction gear R / G gas speed sensor SN ₃ detects the rotational speed N ₃ of the turbine GT, and the rotational speed sensor SN _P for detecting the axle drive rotational speed N _P is provided.

The input interface INa for analog signals includes signals N ₁ , N ₃ and the signals from the aforementioned sensors provided in the gas turbine GT.
_{N P, P 3, T 0} , T 35, T 6 and the analog signal or the like showing the amount of accelerator pedal depression theta _acc of the accelerator pedal is inputted, the input interface INd OFF signal from the key switch to the digital signal, the shift Digital signals such as a shift position signal from the lever and a brake signal from the brake are input.

On the other hand, from the output circuit OUT, the combustor CC actuator A
Signal Gf that indicates the fuel flow rate for 1 and actuator A
2 for the signal α _s that instructs the opening of the variable nozzle VN,
A signal S ₃ for instructing on / off of the lockup clutch of the torque converter, shift signals S ₁ , S _{2 of} the automatic transmission A / T, a throttle wire signal θ _w, etc. are output.

In this two-shaft gas turbine engine, the fuel injection valve is controlled so that the rotation speed N ₁ of the compressor C is constant when the engine is idling.

Next, the engine acceleration control at full throttle of the control circuit 10 in the two-shaft gas turbine engine configured as described above will be described with reference to the flowchart of FIG.

The rotation speed control routine shown in FIG. 3 shows an example of the control procedure of the control circuit 10 shown in FIG.
It is executed every ms.

In step 301, first, it is determined whether the shift range of the automatic transmission A / T is the P range indicating the parking state or the N range indicating the neutral state. When the shift state is the P range or the N range (YES), the process proceeds to step 302, but when the shift state is any other range, the process proceeds to step 303.

In step 302, the rotation speed N ₃ of the output shaft that has passed through the reduction gear R / G of the output turbine PT is compared with the allowable minimum rotation speed N _3min and the allowable maximum rotation speed N _3max . Then, if the rotation speed of the output shaft is within the allowable range, N _3min <N ₃ <N _3max , the process proceeds to step 303, if N ₃ ≦ N _3min , the process proceeds to step 304, and if N ₃ ≧ N _3max , the step proceeds. Proceed to 324.

Go to step 302 when N _3min <N ₃ <N _3max Step 3
In 03, the count value C _N3 , C _N1 ,
C _N1 ′ and C _D are cleared (set to 0) and this routine is ended, and no control is executed. Therefore, the actual control of the present invention after that is when N ₃ ≦ N _3min and when N ₃ ≧ N
Since it will be performed only in the case of _3max , after that, N ₃
Control circuit for ≤ N _3min and N ₃ ≥ N _3max
The control procedure of 10 will be described.

(1) When N ₃ ≦ N _{3 min In} step 304, 1 is added to the value of the counter C _N3 and the other counters C _N1 and C _D are cleared. Then, in step 305, the count value of the counter C _N3 is the maximum set value C.
_It is determined whether _N3max is exceeded. And here C _N3 <
If C _{N3 max} (NO), this routine is terminated and C _N3 ≧ C
_In the case of _N3max (YES), the process proceeds to step 306, the value of the counter C _N3 is set to C _N3max , and the process proceeds to step 307.

In step 307, it is judged whether or not the temperature T ₆ of the combustion gas on the downstream side of the output turbine PT has become equal to or higher than the maximum allowable value. Subsequent control is greatly different depending on whether or not the temperature T ₆ is within the allowable value. Therefore, when T ₆ ≧ T _6max and T ₆ <T
_The control will be described separately for two cases of _6max .

(1) _-When T ₆ ≧ T _6max When the combustion gas temperature exceeds the allowable value (YES), step 3
The process proceeds to 08, 1 is added to the value of the counter C _T6 that performs the counting operation only in this state, and in the following step 309, it is determined whether or not this count value C _T6 exceeds the maximum set value C _T6max . If C _T6 <C _{T6 max} (NO), step 3
The routine proceeds to step 14 and clears the count value C _N1 described later to end this routine. However, if C _T6 ≧ C _T6max (YES), proceed to step 310 and set the value of counter C _T6 to C _T6max and _proceed to the step. Continue to 311.

Step 311 is a step of adjusting the opening degree α _s of the variable nozzle VN, and the target opening degree value VNSET (= A +
B × C _VN : Counter C _VN for changing A and B are constants
The value of is decreased by 1. By this control, the opening degree α _s of the variable nozzle VN becomes large. Then, in the following step 312, it is determined whether or not the value of the counter value C _VN has become negative. If C _VN > 0, the process proceeds to step 314. However, if C _VN ≦ 0, the process proceeds to step 313 and the counter C _VN. After clearing the value of, go to step 314. Then, in step 314, the count value C _N1 is cleared and this routine ends.

(1) -T ₆ <T _6max When the combustion gas temperature is within the allowable range (NO), step 315
_Go to and clear the value of the counter C _T6 described above,
Control is performed to increase the value of the counter C _VN for changing the target opening value VNSET of the variable nozzle VN by 1. By this control, the opening degree α _s of the variable nozzle VN becomes small. In the following step 316, it is determined whether or not the count value C _VN exceeds the maximum set value C _VNmax . If C _VN <C _VNmax (NO), the routine proceeds to step 314, where a count value C _N1 described later is cleared and this routine ends, but if C _VN ≧ C _VNmax (YES), step 317. _{Go to} and set the value of counter C _VN to C
Set to _VNmax and proceed to step 318.

In step 318, when the combustion temperature T ₆ is within the allowable range and the value of the counter C _VN does not exceed the set value C _VNmax for maximally closing the variable nozzle VN, the value of the counter C _N1 performing the counting operation is set to 1 only. In the next step 319, it is determined whether or not the value of the counter C _N1 is equal to or more than the maximum set value C _N1max . If C _N1 <C _N1max (NO), this routine is ended, but C _N1 ≧ C _N1max If so, the process proceeds to step 320, the value of the counter C _N1 is set to C _N1max , and the process proceeds to step 321.

At step 321, the rotation speed N _{1 of the} compressor turbine CT is increased.
Is increased by a predetermined rotation speed ΔN _1, and it is determined in step 322 whether the increased rotation speed N ₁ of the compressor turbine CT is _{equal to} or higher than the maximum allowable rotation speed N _1max . Then, if N ₁ <N _1max (NO), this routine ends, but if N ₁ ≧ N _1max (YES), step 323.
Then, the routine _proceeds to _{step S1} and sets the value of the rotation speed N ₁ to N _1max and terminates this routine.

(2) When N ₃ ≧ N _3max When the rotation speed N _{3 of the} output shaft exceeds the allowable rotation speed N _3max , first, at step 324, the value of the counter C _N3 and the counter C _N1 are cleared. Then, in step 325, 1 is added to the value of the counter C _N1 ′, and in the following step 326, it is determined whether or not the count value of the counter C _N1 ′ exceeds the maximum set value C _N1 ′ max. Then, when C _N1 ′ <C _N1 ′ max (NO), this routine is terminated, and when C _N1 ′ ≧ C _N1 ′ max (YES), the routine proceeds to step 327, where the value of the counter C _N1 ′ is set.
Set C _N1 ′ max and proceed to step 328.

At step 328, the rotational speed N _{1 of the} compressor turbine CT
Is controlled to decrease by a predetermined rotation speed ΔN _1, and it is determined in step 329 whether the rotation speed N ₁ of the compressor turbine CT decreased below the allowable minimum rotation speed N _1min . Then, if N ₁ > N _1min (NO), this routine is ended, but if N ₁ ≦ N _1min (YES), the routine proceeds to step 330, where the value of the rotation speed N ₁ is set to N _1min .

In the following step 331, 1 is added to the value of the counter C _D that performs the counting operation only when N ₃ ≧ N _{3 max} and N ₁ ≦ N _{1 min} , and in the following step 332, this count value C _D is the maximum set value C _Dmax. It is determined whether or not is exceeded. Then, if C _D <C _Dmax (NO), this routine ends, but if C _D ≧ C _Dmax (YES), the process proceeds to step 333, and the value of the counter C _D is set to C _Dmax. Go to step 334.

Step 334 is a step of adjusting the opening degree α _s of the variable nozzle VN, and performs control to decrease the value of the counter C _VN by 1 for changing the target opening value VNSET of the variable nozzle VN.
By this control, the opening degree α _s of the variable nozzle VN becomes large. Then, in the following step 335, it is determined whether or not the value of the counter value C _VN becomes negative. If C _VN > 0 (NO), this routine is ended, and if C _VN ≦ 0 (YES), the step 336 is executed. _Go to and clear the value of the counter C _VN and end this routine.

The counter in the above embodiment is initialized when the vehicle ignition switch is turned on. Further, the increase / decrease control of the rotation speed N ₁ of the compressor turbine CT in step 321 and step 328 is performed by increasing / decreasing the combustion flow rate Gf supplied to the normal combustor CC.

According to the control of this embodiment as described above, when the rotation speed N ₃ of the output shaft becomes less than the allowable minimum rotation speed, the variable nozzle
First increase the rotational speed N ₃ by adjusting the VN opening degree alpha _s, then the rotational speed N ₃ by raising up allowable speed N _1max the rotational speed N ₁ of the compressor turbine CT by such as increased combustion rate It is increasing. As a result,
The rotation speed N ₃ can be increased while considering the fuel consumption rate.
On the other hand, when the rotation speed N ₃ exceeds the maximum allowable rotation speed,
First, the rotational speed N ₃ is reduced by decreasing the fuel flow rate, and then the opening of the variable nozzle VN is adjusted to adjust the rotational speed N 3.
I am trying to lower ₃ .

[Effect of device]

As described above, according to the present invention, in the two-shaft gas turbine engine, it is possible to prevent a decrease in the rotational speed of the engine output shaft during idle operation, and further, the fuel consumption rate is not impaired. There is.

[Brief description of drawings]

FIG. 1 is a principle configuration diagram of an idle control device for a gas turbine engine of the present invention, FIG. 2 is an overall schematic diagram showing the configuration of an embodiment of a two-shaft gas turbine engine of the present invention, and FIG. FIG. 4 is a flowchart showing an example of the control procedure of the control circuit shown in FIG. 4, and FIG. 4 is a diagram showing the general configuration of a conventional two-shaft gas turbine engine. 1 ... Idle state detecting means, 2 ... Output shaft rotational speed detecting means, 3 ... Combustion gas temperature detecting means, 4 ... First control means, 5 ... Second control means, 6 ... Third Control means,
AX ... Auxiliary equipment, C ... Compressor, CC ... Combustor, CT ...
… Compressor turbine, F / G …… front gear, HE…
… Heat exchanger, PT …… Power turbine, SM …… Starter, VN
...... Variable nozzle.

Claims (1)

[Scope of utility model registration request] 1. A heat exchanger (HE) compressed by a compressor (C)
Intake air heated by the above is combusted in the combustor (CC), this compressor gas drives the compressor turbine (CT) directly connected to the compressor (C), and the combustion gas after passing through the variable nozzle (VN) drives auxiliary equipment. A two-shaft gas turbine engine idle control device configured to drive an output turbine (PT) that is connected to a load that includes it, and then perform heat exchange with a heat exchanger (HE). Idle state detection means, output rotation speed detection means for detecting the rotation speed of the output shaft of the output turbine, combustion gas temperature detection means for detecting the temperature of the combustion gas on the downstream side of the output turbine, and the engine is in the idle state. First control means for opening the opening of the variable nozzle to a predetermined value when the rotation speed of the output shaft is less than a predetermined value and the temperature of the combustion gas is a predetermined value or more; and an engine idle state and rotation of the output shaft. number Is less than a predetermined value and the temperature of the combustion gas is less than a predetermined value, the second control means for closing the opening of the variable nozzle to a predetermined value or increasing the rotational speed of the compressor turbine to a predetermined value, A third control means for reducing the rotation speed of the compressor turbine to a predetermined value or for opening the opening of the variable nozzle to a predetermined value when the rotation speed of the output shaft is equal to or higher than a predetermined value in an idle state; Turbine engine idle control device.