KR20020030345A - Low speed function increasing system or control method for turbo charger - Google Patents

Abstract

PURPOSE: A performance improvement apparatus of a turbocharger and a control method thereof are provided to reduce exhaust gas at low speed and low load, and to improve output, fuel efficiency and responsiveness by supplying air to a turbine of the turbocharger variably. CONSTITUTION: A performance improvement device of a turbo charger(40) at low speed is composed of an air reservoir tank(30) connecting to an air compressor of an engine(42) through a first air pipe(46), and having a check valve; a second air pipe(34) connected to supply air from the air reservoir tank to a turbine; a solenoid valve(36) controlling air supplied from the second air pipe to the turbine; and an electronic control unit(38) controlling the solenoid valve by detecting signals from an accelerator pedal sensor(54), a boost sensor and an engine rpm sensor. The solenoid valve supplies high pressure air from the air reservoir tank to an air hole of a turbine wheel housing according to the signal from the electronic control unit at low speed and low load. Performance and fuel efficiency is improved, and exhaust gas is reduced.

Description

LOW SPEED FUNCTION INCREASING SYSTEM OR CONTROL METHOD FOR TURBO CHARGER}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a low speed increaser and control method for a turbocharger. More particularly, the present invention provides a variable amount of air to a turbine of a turbocharger, thereby reducing exhaust gas and fuel consumption at low speed and low load, and improving output and response. It relates to a low speed increasing device and a control method of a turbocharger.

1 is a view schematically showing a turbocharger configuration according to the prior art, in which the turbocharger 2 uses energy of exhaust gas generated after an engine explosion so that the turbine wheel 4 rotates with exhaust gas pressure and high thermal energy. do.

Accordingly, when the turbine wheel 4 is rotated, the compressor 6 on the same axis also rotates to push the air introduced through the air cleaner 8 into the engine 8 so as to supercharge the intake air to increase the air filling rate. It is a device to improve output and reduce exhaust gas. .

Through the exhaust manifold 10, cold and expanded exhaust gas is directly discharged to the exhaust system by the turbine housing 12, and when the intake manifold 14 pressure reaches a set value, some exhaust gas is discharged from the waste gate 16. Bypass is made through the opened valve 18 surface.

The exhaust gas exits the exhaust manifold 10 through the turbine 4, while the mixed gas concentrated and charged in the combustion chamber 20 generates further increased horsepower during the explosion stroke.

The above-described conventional technology charges only with the energy of the exhaust gas, so that when the engine is operated at a low speed or low load or when the acceleration is accelerated, the exhaust gas is excessively discharged or the fuel consumption is high compared to high speed and high load. There is this.

When low speed is important, a low speed turbocharger can be applied, but at this time, there is a problem in that it is difficult to develop an engine because there is an exchange relationship in which the supercharge at high speed is too large and the high speed fuel economy and exhaust gas are deteriorated.

In order to solve the above problem, there is a turbocharger equipped with a waste gate valve that can reduce the supercharge at high speed, but it does not fundamentally cope with solving the low speed problem, and a supercharger has been developed, but the economy is inferior due to high cost and complicated structure. There is this.

Therefore, the present invention has been invented to solve the above-mentioned problems, and an object of the present invention is to reduce the exhaust gas and fuel efficiency at low speed and low load, and to output and responsively by supplying air to the turbine of the turbocharger variably. The present invention provides a low speed increaser and a control method for a turbocharger.

1 schematically shows a turbocharger configuration according to the prior art;

2 is a view schematically showing the configuration of a turbocharger low speed performance increasing apparatus according to the present invention.

3 is a view showing an air supply hole in the turbine of the turbocharger according to the present invention.

4 is a view showing a low speed performance increasing apparatus and a control method of a turbocharger according to the present invention.

<Description of the symbols for the main parts of the drawings>

30. Low speed booster of turbocharger Air reservoir tank

34. The second air pipeline 36. Solenoid valve

38. Electronic Control Unit

The present invention for realizing this

In the turbocharger,

An air reservoir tank connected to the air compressor of the engine and installed with a check valve as a first air pipe;

A second air pipe path connected to supply air from the air reservoir tank to the turbine,

A solenoid valve for controlling the air supplied to the turbine to the second air pipe;

The solenoid valve to provide a low speed increaser of the turbocharger, characterized in that it comprises an electronic control device for determining and controlling the electrical signal from the accelerator pedal sensor, the boost pressure sensor, the engine speed sensor.

Reading the engine speed after driving the engine,

Reading the boost pressure of the engine,

Reading the engine load due to the throttle valve opening degree,

Determining whether the accelerator pedal sensor, the boost pressure sensor and the engine speed sensor are normal;

Determining whether the sensor is in a normal state, if the sensor is not normal, and if the sensor is normal;

Terminating if sudden acceleration / deceleration in the above step, or determining whether the solenoid valve is broken;

If the solenoid valve is not broken in the step, calculating the solenoid valve operating duty;

The operation of the solenoid valve after the operation in the above step is to provide a low speed increaser and control method of the turbocharger characterized in that the control.

The present invention provides a low speed increaser and a control method of a turbocharger including a step of turning on a warning light when it is determined that the solenoid valve is not broken.

Below. When described in more detail on the basis of the accompanying drawings the preferred configuration and operation of the present invention.

2 is a view schematically showing a configuration of a turbocharger low speed performance increasing apparatus according to the present invention, Figure 3 is a view showing the formation of an air supply hole in the turbine of the turbocharger according to the present invention.

4 is a view illustrating a low speed performance increasing apparatus and a control method of a turbocharger according to the present invention.

The low speed increaser 30 of the turbocharger is composed of an air reservoir tank 32, a second air conduit 34, a solenoid valve 36, and an electronic controller 38.

The air reservoir tank 32 is separately connected to the air compressor 44 installed in the engine 42 in the turbocharger 40 while having the check valve 48 as the first air pipe 46.

The second air pipe 34 connects the air of the air reservoir tank 32 to the turbine 48.

The turbine 48 is formed by drilling an air hole 50 so that the second air pipe path 34 is connected. It is formed in the tangential direction.

The solenoid valve 36 is provided to control the air supplied to the turbine 48 in the 2nd air conduit 34.

The electronic control device 38 is connected to the solenoid valve 36 to determine and control the electrical signal from the accelerator pedal sensor 54, the boost pressure sensor 56, and the engine speed sensor 58.

The operation of the present invention made as described above is the air reservoir tank 32 through the first air pipe 46 and the check valve 48 until the constant pressure from the air compressor 44 after the engine 42 is driven. Will receive air and store it.

Accordingly, the electronic controller 38 controls the engine speed S10, the boost pressure S20, and the engine load S30 after the engine 42 is driven by the accelerator pedal sensor 54, the boost pressure sensor 56, and the engine rotation. It is sensed through the male sensor 58.

Then, it is determined whether the accelerator pedal sensor 54, the boost pressure sensor 56, and the engine speed sensor 58 are normal (S40), and if the sensor 54 is not normal (S100), the acceleration / deceleration is normal. The authorization is determined (S50).

Then, when the electronic control device 38 recognizes the rapid acceleration and deceleration, the control flow is terminated (S100), or it is determined whether the solenoid valve 36 is broken (S60).

At this time, if the solenoid valve 36 is not broken, the control is terminated (S100) and at the same time the warning light is turned on (S90).

If the solenoid valve 36 is broken, the solenoid valve 36 is operated after reading the operation duty calculation of the solenoid valve 36 (S70).

That is, the solenoid valve 36 operates through a signal of the electronic controller 38 in the section of the low speed low load region to connect the high pressure air stored in the air reservoir tank 32 to the second air conduit 34. Supply through the air hole 50 of the housing (52).

This increases the efficiency of the turbine 48 even at low speed and low load, thereby increasing the efficiency of the compressor 60.

Then, the electronic control device 38 detects that the state of the engine 42 is high speed through the sensors 54, 56 and 58, and thus the solenoid valve 36 is not operated as separate air is not required. In this case, the air in the air reservoir tank 32 is interrupted from being supplied to the turbine 48 through the second air conduit 34.

Accordingly, the air reservoir tank 32 receives air from the air compressor 44 to maintain a constant pressure.

The low speed increaser of the turbocharger can be expected to improve the performance of the turbocharger even at low speed and low load.

This greatly reduces the exhaust gas.

In addition, there is an effect of reducing the engine output and fuel efficiency at low speeds.

In addition, the response of the vehicle is improved.

Claims (5)

In the turbocharger, An air reservoir tank connected to the air compressor of the engine and installed with a check valve as a first air pipe; A second air pipe path connected to supply air from the air reservoir tank to the turbine, A solenoid valve for controlling the air supplied to the turbine to the second air pipe; Low speed increase device of the turbocharger characterized in that it comprises an electronic control device for controlling the solenoid valve by determining the electrical signal from the accelerator pedal sensor, the boost pressure sensor, the engine speed sensor The turbocharger of claim 1, wherein the turbine is formed by drilling an air hole so that a second air pipe line is connected to the turbine. The turbocharger of claim 2, wherein the air hole is formed in a circumferential tangential direction of the turbine housing so as not to resist the flow of exhaust gas. Reading the rotation speed of the engine after driving the engine (S10); Reading the boost pressure of the engine (S20), Reading the engine load by the throttle valve opening degree (S30), Determining whether the accelerator pedal sensor, the boost pressure sensor, and the engine speed sensors are normal (S40); In step S40, if the sensors are not normal, the process is terminated, and if it is normal, it is determined whether the sudden acceleration / deceleration is performed (S50). In step S50, if sudden acceleration and deceleration is terminated, or determining whether the solenoid valve is broken (S60); If the solenoid valve is not broken in the step (S60), the step of calculating the solenoid valve operating duty (S70), Low speed increase device and control method of the turbocharger, characterized in that the control in step (S80) after operating in the step (S70) operating the solenoid valve. The low speed increase apparatus and control method of a turbocharger according to claim 4, comprising the step (S90) of lighting a warning light when it is determined that the solenoid valve is not broken.