JPS6172835A - Supercharger control device - Google Patents

Abstract

PURPOSE:To enable a device to instantaneously correspond to a change or the like in a dynamic engine flow characteristic, by setting an increase of necessary charging air pressure from the blower output ratio and the quantity of charging air in a standard condition and regulating a nozzle area in a supercharger, in the case of the supercharger of variable nozzle area. CONSTITUTION:While an engine 1 is in operation, a computer 100 fetches an output signal of each detector 5-7 for a charging air quantity, charging air pressure and the atmospheric pressure. And the computer calculates by a blower pressure ratio calculator 108 the then blower pressure ratio from a charging air pressure and an atmospheric pressure signal while by a standard condition charging air quantity calculator 106 the charging air quantity in a standard condition from a charging air quantity signal of the output of an A/D converter 103-105. Next the computer, setting a necessary increase of charging air pressure in a charging air pressure increase setter 107 from an output of each calculator 108, 106, sets an increase of nozzle area in a nozzle area setter 109 in accordance with said increase of the necessary charging air pressure. And a supercharger 2 changes its nozzle area through a nozzle area regulator 3 on the basis of the set increase of the nozzle area.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a supercharger control device for an internal combustion engine.

[Conventional technology]

FIG. 4 shows an internal combustion engine equipped with a conventional supercharger.

In the figure, air introduced into cylinder 01 is compressed and fuel is injected from fuel injection valve 02, causing an explosion.
Burn. High-temperature exhaust gas generated by combustion is guided to a supercharger nozzle 04 through a static pressure pipe 03. Thermal energy of the exhaust gas is converted into kinetic energy by the nozzle 04, which rotates the supercharger turbine 05 and transmits power to the rotor 06. This power causes the blower 07 of the supercharger to rotate, compressing the working air and guiding it to the scavenging trunk 09.

[Problem that the invention seeks to solve]

However, the conventional method described above has the following drawbacks.

With conventional nozzles, the nozzle area cannot be changed, and therefore the flow rate characteristics of the engine are statically and uniquely determined, and its operating line cannot be changed.

Also, in a turbocharger with a variable nozzle area structure,
The area change setting is often determined mechanically based on the engine's load per rotation speed, etc.

If the engine flow rate characteristics are dynamically restricted due to sudden steering or sea conditions, or if the engine flow rate characteristics are restricted due to dirt on the turbocharger nozzle or other parts of the engine, surging of the turbocharger will be induced. There were drawbacks.

An object of the present invention is to provide a control device that can avoid surging of the supercharger due to sudden steering, sea conditions, etc., and dirt on the supercharger nozzle and other parts of the engine.

[Means for solving problems]

Its feature is that in internal combustion engines with variable nozzle area superchargers, the atmospheric pressure signal from the atmospheric pressure detector and the boost pressure signal from the boost pressure detector are input and the blower pressure ratio is output. A blower pressure ratio calculator, a standard state air supply amount calculator that converts the air supply amount signal from the air supply amount detector into an air supply amount signal in the standard state, and a standard state air supply amount calculator that converts the air supply amount signal from the air supply amount detector into the air supply amount signal in the standard state. A boost pressure increment setting device that inputs and sets the necessary boost pressure increment, a nozzle area setting device that sets the nozzle area increment by inputting the above boost pressure increment, and a nozzle area that detects the nozzle area and inputs it to the corrector. A detector, a corrector that corrects the setting amount from the nozzle area setting device so that it does not exceed the maximum and minimum values of the nozzle area, and the corrected setting amount from the corrector is input to adjust the nozzle area of the turbocharger. It is equipped with a nozzle area adjuster that can be changed.

[Effect]

In this case, in a supercharger that can change the nozzle area, the change in area is set by a conbeater, so that it can immediately respond to changes in dynamic engine flow characteristics.

〔Example〕

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is an explanatory diagram showing an apparatus according to an embodiment of the present invention.

In the figure, 1 is an engine, 2 is a variable nozzle area supercharger, 3 is a nozzle area adjuster, 4 to 7 are various status detectors, 1
00 is a conbeater.

The computer 100 is an analog to digital converter 102
~105. Digital-to-analog converter 101, standard state air supply amount calculator 106. Supply pressure increment setting device 107. Blower pressure ratio calculator ios, nozzle area setting device 109. It consists of a corrector 110.

The operation in the case of the above configuration will be described.

The air supply amount detector 5 detects the air supply bone among the state quantities during engine operation.
Further, the supply pressure detector 6 similarly detects the supply pressure. Further, the atmospheric pressure detector 7 detects the atmospheric pressure at that time.

Various detected values are converted into digital values by analog to digital converters 103 to 105 within the converter 100.

The blower pressure ratio calculator 108 calculates the blower pressure ratio at that time from the supply air pressure and atmospheric pressure.

The standard state air supply amount calculator 106 calculates the detected air supply amount to convert it into the standard state air supply amount.

The boost pressure increment setting device 107 stores basic engine flow rate characteristic setting values as shown in FIG.

Set the required increment of air supply pressure by inputting the current blower pressure ratio and air supply amount.

The nozzle area setter 109 stores the relationship between the nozzle area increment and the supply air pressure increment shown in FIG. 2, and sets the nozzle area increment by inputting the required increment of the supply air pressure.

This required increase in the nozzle area is passed through the corrector 110 and converted into an analog signal by the digital to analog converter 101.

The nozzle area adjuster 3 changes the nozzle area of the supercharger 2 based on this analog amount.

The nozzle area detector 4 detects the nozzle area at that time,
The detected amount is converted into a digital amount by the analog-to-digital converter 102 and input to the corrector.

The corrector stores the maximum and minimum values of the nozzle area, corrects the set amount output from the nozzle area setting device 109 so that it does not exceed the maximum and minimum values, and transmits the corrected value to the digital to analog converter 101. .

〔Effect of the invention〕

The above case has the following effects.

The surging of the supercharger due to sudden steering, changes in dynamic motion due to sea conditions, etc., and dirt on the supercharger nozzle and inside the engine can be avoided by controlling the supercharger nozzle area using the conbeater.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram showing a device according to an embodiment of the present invention, FIG. 2 is a diagram showing the relationship between nozzle area increment and supply air pressure increment, and FIG. 3 is a diagram showing the engine flow rate characteristic setting value. FIG. 4 is an explanatory diagram showing an internal combustion engine equipped with a conventional supercharger. 2... Variable nozzle area supercharger, 3... Nozzle area adjuster, 4... Nozzle area detector, 5... Air supply amount detector. 6... Supply pressure detector, 7... Atmospheric pressure detector, 106
...Standard state air supply amount calculation machine, 107...Intake pressure increment setting device, 108...Zorua pressure ratio calculation machine, 109...
- Nozzle area setting device, 110...corrector. O5 Turbi) 06 Low 9-

Claims (1)

[Claims] 1. Blower pressure ratio calculation that outputs the blower pressure ratio by inputting the atmospheric pressure signal from the atmospheric pressure detector and the supply pressure signal from the supply air amount detector in an internal combustion engine having a supercharger with a variable nozzle area. The standard state air supply amount calculator converts the air supply amount signal from the air supply amount detector into the air supply amount signal in the standard state, and the above blower pressure ratio and the air supply amount in the standard state are input and the necessary A supply pressure increment setting device that sets the increment of the supply pressure, a nozzle area setting device that sets the increment of the nozzle area by inputting the increment of the supply pressure, a nozzle area detector that detects the nozzle area and inputs it to the corrector, and a nozzle. A corrector that corrects the setting amount from the nozzle area setting device so that it does not exceed the maximum and minimum area values, and a nozzle area that changes the nozzle area of the turbocharger by inputting the corrected setting amount from the corrector. A supercharger control device characterized by being equipped with a regulator.