JPS6022032A - Control apparatus for power generating means utilizing supercharged diesel engine - Google Patents

Abstract

PURPOSE:To improve characteristics of transient response to the rapid load change, by controlling increasing and decreasing of the fuel supply rate as well as a turbine nozzle of an exhaust turbocharger through detection of the load change. CONSTITUTION:An adjustable turbine nozzle 7 is provided in an exhaust turbine of an exhasut turbocharger which is attached to a highly supercharged diesel engine 1, and the nozzle 7 is controlled by a turbine nozzle controlling servo- unit 16. That is, the load change of a generator 2 is detected by a current transformer 11 and the output signal of the current transformer 11 is furnished to an arithmetic comparison circuit 12, in which the engine speed detected by an engine-speed detecting means 19 is compared with a deviation value, a differential value, a integral value, etc. to the initial set value. From the result of the above comparison, the required fuel supply rate and the required air supply rate are calculated by a circuit 13 for calculating the fuel supply rate and the air supply rate, and the servo-unit 16 as well as a fuel servo-unit 17 are controlled according to the result of the above calculation.

Description

[Detailed Description of the Invention] A supercharging dee that drives a generator. The present invention relates to a control device for a ZEL power generator.

In diesel power generators, in order to keep the speed fluctuation rate during transients due to load fluctuations within a predetermined value, conventionally, changes in engine speed due to load fluctuations are detected mechanically and electrically by a governor, and then , there are methods to increase or decrease the fuel in the engine, or methods to increase or decrease the fuel by detecting changes in load using a current transformer installed on the generator side before the engine rotational speed fluctuates.The latter method is better. Instantaneous fluctuation rate (will be improved.

However, in a highly supercharged diesel engine with an exhaust turbo supercharger, no matter how much the responsiveness of the fuel increase/decrease control described above is improved, the transient response characteristics of the exhaust turbo supercharger will be affected in response to a sudden increase in load. Since it has not been improved,
When the load suddenly increases, sufficient air cannot be supplied in time to burn the large amount of fuel injected into the engine, making it impossible to obtain sufficient output.

This has been an obstacle to improving the speed fluctuation rate.

The present invention was made based on the above circumstances, and
The purpose is to improve the transient response of the supercharger by detecting load fluctuations, controlling increases and decreases in the amount of fuel supplied, and also controlling the turbine nozzle of the exhaust turbocharger. .

An embodiment of the present invention will be described in detail below with reference to the drawings.

8i′! FIG. 1 is a system diagram showing an embodiment of a control device for a supercharged diesel power generator according to the present invention.

First, to explain the supercharged diesel generator, 1.
is a highly supercharged diesel engine, and 2 is a generator connected to this engine 1. Fuel is supplied to the highly supercharged diesel engine 1 by a fuel injection pump 3 through a fuel injection valve 4 and into a cylinder 5 . Exhaust gas produced by combustion in the cylinder 5 is collected in an exhaust pipe 6 and supplied to a variable turbine nozzle 7 of an exhaust turbo supercharger, where it drives a turbine wheel 8. Since the compressor 9 is directly connected to the turbine wheel 8,
The rotation of the turbine wheel 8 causes the compressor 9 to rotate and compress the air. The air discharged by the compressor 9 is supercharged through the air supply pipe 10 to the cylinder 5 of the highly supercharged diesel engine.

Next, the control device will be explained. The highly supercharged diesel engine 1 is provided with a rotation detector 1a for detecting its rotation speed. In addition, the generator 2 has a current transformer 1
1 is provided to detect load fluctuations. Reference numeral 12 represents a current transformer, and a comparison calculation circuit that compares the current transformer with deviation values, differential values, integral values, etc. with respect to preset rotational speed, rated output, etc. Reference numeral 13 denotes a fuel Fl and air amount calculation circuit which calculates the amount of fuel and air to be supplied to the highly supercharged diesel engine based on the output of the comparison calculation 1st path 12.

The air amount signal from the fuel and air amount calculating circuit 13 is separately supplied to the turbine nozzle control circuit 14, and the instant fuel supply signal is separately supplied to the fuel control circuit 15. Then, the turbine nozzle control circuit 14 supplies a signal based on the air amount signal to the turbine nozzle adjustment servo unit 16 to drive the servo unit, and controls the nozzle product of the variable turbine nozzle 7 according to the control amount. On the other hand, the fuel control circuit 15 supplies fuel to the fuel servo unit 17 based on the fuel supply signal to drive the servo unit, and moves the fuel rack 18 according to the controlled amount. , controls the amount of fuel injected from the fuel pump 3.

Next, the operation of the device of the present invention will be explained.

In the present invention (1':l:, the turbine nozzle is
Since the variable turbine nozzle 7 is of a modified type and is controlled by the turbine nozzle control circuit J4 and the turbine nozzle adjustment servo unit 16, the turbine rotor ffi can be rotated at high speed even in a no-load state. That is, even when there is no load, the turbine nozzle control circuit 14 and the turbine nozzle adjustment servo unit 16
By narrowing down the nozzle area of the variable turbine nozzle 7,
The exhaust gas flow velocity in the nozzle is increased to maintain the rotational speed of the turbine rotor at approximately 70% of the rated speed.

Therefore, if the load on the generator 2 suddenly increases, the change in load is immediately detected by the current transformer 11 and input to the comparison calculation circuit 12. Comparison calculation circuit 12
The rotation speed of the diesel engine 1 detected by the rotation detector 19 is also input, and these are compared with the deviation value, differential value, integral value, etc. with respect to the initial setting value, and based on the results, the fuel The required fuel supply amount and air amount are calculated in the air amount calculation circuit 13. Then, the fuel control circuit 15 and the fuel servo unit 17 move the fuel rack 18f in the fuel increasing direction to increase the amount of fuel injected into the cylinder 5. On the other hand, the air required for combustion is sent into the cylinder 5 by a compressor 9 driven by a turbine wheel 8, but since the rotation speed is already maintained at about 70% of the rated speed when no load is applied, It is possible to increase the rotation speed to a desired speed and increase the amount of air supplied. Therefore, since the air mass can be increased in accordance with the increase in fuel, the output response delay is extremely reduced, and as a result, the speed fluctuation is improved by +41.

Figures 2 and 3 show a conventional supercharged diesel generator (
Figure 2) and according to the present invention? It is a characteristic diagram showing a comparison of the operating conditions with a supercharged diesel generator equipped with a tilJ control device (Fig. 3), where a is load fluctuation, 1] is supercharger rotation speed and turbine nozzle area, C is the fuel supply amount, d
are the rotational speeds of the diesel engine versus time. From these figures, it is clear that according to the present invention, the acceleration time of the supercharger is halved in response to load fluctuations, and accordingly, fluctuations in engine speed are significantly improved.

Note that the control device of the present invention also allows the following control.

(1) The variable nozzle opening of the turbo is controlled so that the minimum rotation speed of the exhaust turbo supercharger during operation is approximately 70% or more of the maximum rotation speed of the turbo during operation of the generator, and the Even if the load is suddenly turned on from a low load, the engine output can be made to catch up in a short time.

(2) If the generator load pattern is predetermined, Rin, which synchronizes the generator load control signal generator and the engine control program, automatically controls the fuel injection and the variable nozzle on the exhaust turbo supercharging ear. Engine output response delay, which is inferior to control, can be reduced.

As described in detail above, according to the present description, the transient response characteristics to rapid load fluctuations are significantly improved.

As a result, the 714 degree fluctuation rate, which is a necessary characteristic for a power generation device, is significantly improved.

[Brief explanation of the drawing]

Fig. 1 is a system diagram showing an embodiment of a control device for a supercharged diesel power generation device according to the present invention, Fig. 2 is a characteristic diagram showing the operating state of a conventional supercharged tea cell power generation device, and Fig. 3 is a diagram showing an embodiment of a control device for a supercharged diesel power generation device according to the present invention. It is a characteristic diagram showing the operating state of the supercharged tea cell power generation device controlled by. 1. Highly supercharged diesel (Ikuseki, 2. Power generation 'IV';
13-・Fuel injection pump, 7・Il′ili′J variable turbine nostle, 9・・Compressor, 1III11 current transformer, ]2・・Comparison calculation circuit, ]3・・Fuel level and air flow calculation circuit, 14・・・Turbine nozzle control circuit, 1
5... Fuel control circuit, 16... Turbine nozzle WJ J
l Servo unit, 17...Fuel servo unit, 1
8...Fuel rack, 19...Rotation detector Fig. 1 - Nukao Hase times≦ml

Claims (1)

[Claims] A control device for a supercharged diesel generator that drives a generator by an exhaust turbocharged diesel engine includes a comparison calculation device that inputs the rotation speed of the diesel engine and the load of the generator and outputs a deviation value from a set value; A fuel and air amount calculation device that calculates the required amount of fuel and air to be supplied based on the output of the ratio calculation device, and a fuel supply amount to the exhaust turbocharged diesel engine based on the fuel signal from this device. and a turbine nozzle control device that controls the amount of air supplied by controlling the variable turbine nozzle of the exhaust turbocharged diesel engine based on the air amount signal from the fuel and air amount 6IT calculating device. A control device for a supercharged diesel power generation device.