KR200190827Y1 - Electric control throttle valve use turbo charger waste gate - Google Patents

Abstract

The present invention provides a turbocharger waste gate using an electronically controlled throttling valve that can precisely control the bypass amount of exhaust gas to reduce intake throttling loss in the high load region of the engine. In the waste gate which rotates a turbine impeller and a compressor impeller connected coaxially with this turbine impeller bypasses exhaust gas to the turbocharger which compresses and supplies intake air, and controls the compression degree of intake air. It is characterized in that the throttling valve is opened and closed by the actuator.

Description

Turbocharged waste gate using electronically controlled throttling valve {ELECTRIC CONTROL THROTTLE VALVE USE TURBO CHARGER WASTE GATE}

The present invention relates to a supercharger (hereinafter referred to as a turbocharger) for increasing the amount of intake air of an engine, and in particular, to control the amount of exhaust gas flowing into a turbine to reduce the flow rate of the exhaust gas during high-speed rotation of the engine, thereby compressing the intake air. The present invention relates to a turbocharger waste gate using an electronically controlled throttling valve for precisely controlling the exhaust gas bypass amount by installing an throttling valve in the waste gate and controlling the electronically.

The turbocharger, in which a compressor impeller connected coaxially with the turbine impeller by using the energy of the engine exhaust gas and coaxially connected with the turbine impeller, compresses the intake air and supplies a waste gate to control the boost pressure.

The engine is a device that uses energy generated by combustion of air and fuel.In the engine, the air volume acts as an important variable for determining the output and other operating conditions. Can be.

Spark Ignition Engine          (Gasoline engine, gas engine) Compression Ignition Engine     (diesel) Excess air Possible to exceed lean equivalence ratio. Too much power can cause engine damage. Possible pumping efficiency deterioration Under-air Excessive equivalence ratio may be exceeded. Operation is difficult due to under output. Excess smoke

Therefore, the air volume always requires optimum control over the entire operating region of the engine.

1 shows a flow chart of an exhaust gas of a turbocharger having a general waste gate. The opening amount of the waste gate 50 bypasses the amount of exhaust gas flowing into the turbine impeller 52 and reduces the amount of exhaust gas. The compressor impeller 54 which is coaxially connected with the 52 and supplies the suction air controls the amount of air.

2 is a block diagram of a valve for controlling a conventional waste gate.

As shown, a disk-shaped valve 60 for opening and closing the waste gate 50 is connected via the connecting rod 62, and an end of the connecting rod 62 is jointed with the rod 66 of the mechanical actuator 64. (68) As the mechanical actuator 64 is operated by pneumatic, the disk-shaped valve 60 is configured to open and close like a virtual line.

Since the disk-shaped valve 60 configured as described above opens the entire area of the bypass flow path at the moment of first opening due to the kinematic structure, it is impossible to accurately control the exhaust gas bypass amount once the valve 60 is opened.

Therefore, the present invention was devised to solve the above problems of the prior art, and has an electronically controlled throttling valve which can precisely control the bypass amount of the exhaust gas to reduce the intake throttling loss in the high load region of the engine. It is an object of the present invention to provide a turbocharged waste gate.

The present invention to achieve the above object,

In the waste gate which controls the compression level of the intake air by turning the turbine impeller by using the energy of the engine exhaust gas and bypassing the exhaust gas to the turbocharger which the compressor impeller connected coaxially with the turbine impeller compresses and supplies the intake air. ,

The waste gate is characterized in that the throttling valve is opened and closed by an electronic actuator.

1 is a flow chart of an exhaust gas of a turbocharger having a general waste gate.

2 is a block diagram of a valve for controlling a conventional waste gate.

3 is a block diagram of a valve for controlling the waste gate of the present invention.

4 is a control flowchart of the waste gate of the present invention.

5 is a comparative graph of the present invention.

6a and 6b are comparative graphs of the present invention.

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

10 turbine housing 12 waste gate

14 electronic actuator 16 throttle valve

16a: valve shaft

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

Figure 3 shows a valve configuration for the control of the waste gate of the present invention.

As illustrated, the throttling valve 16 formed in the turbine housing 10 constituting the turbocharger is opened and closed by the electronic actuator 14 to the waste gate 12 which bypasses exhaust gas before entering the turbine impeller. It is configured by installation.

According to the present invention configured as described above, the throttling valve 16 is opened and closed like an imaginary line around the valve shaft 16a according to the electronic actuator 14, and thus the linearity between the open areas (bypass amount) of the waste gate 12 is Excellent and very advantageous for bypass control (see Figure 5).

Figure 4 is a control flow chart of the waste gate of the present invention, the exhaust gas of the high temperature and high pressure is generated by the explosion stroke of the engine, the exhaust gas is introduced into the turbine, and some are bypassed through the waste gate, the rest of the turbine impeller It is discharged after driving and generates the boost pressure by the compressor impeller coaxially connected to the turbine impeller, measures the actual boost pressure through the pressure sensor, compares the target value with the target boost pressure, and compares the difference between the actual value and the actuator. The amount is controlled by the PID controller (proportional position action integral action derivative action) so that the throttling valve precisely controls the opening amount of the waste gate.

By repeating the above process, the control is continuously performed in the driving state of the vehicle in which the movement amount is maintained when the actual boost pressure coincides with the target boost pressure and the driving point change is continued.

According to the present invention configured as described above has the effect of controlling the accurate exhaust gas bypass amount and the boost pressure by the electronic actuator, the throttling valve and the feedback control.

6A and 6B are graphs comparing the intake cylinder throttle valve opening amount (FIG. 6A) and the boost pressure (FIG. 6B) according to the driver's accelerator pedal stepping amount with the conventional method. To adjust the amount of fuel air mixer supplied to the engine by applying a throttling valve to the intake side.

In the conventional method, the pedal stepped amount and the disc-shaped valve opening amount are proportional to each other, so that the boost pressure is also generated in proportion to these two variables.

In this method, the pedal stepping amount and the intake throttling valve opening amount are proportional only in the low load area below a certain level, and in the subsequent area (high load area), the intake throttling valve is in the fully open position regardless of the increase in the pedal stepping amount. Will be maintained.

Therefore, the boost pressure control in this area is carried out by the throttling valve of the turbocharger waste gate.

Conventional method This design method Zone (1) * The opening amount of the disc valve increases according to the pedal stepping amount * Intake throttling valve opening increases according to pedal stepping amount * Intake throttling valve opening speed is faster than conventional method * Intake throttling valve fully open at the end of area (1) Zone (2) * The disc valve opening increases according to the pedal stepping amount * Disc valve fully open when pedal is fully depressed * Intake inlet loss area * Intake throttling valve is completely open regardless of pedal stepping amount * Turbocharger waste gate throttling valve is closed in this area as pedal is pressed. * No intake throttle loss in all areas

As described above, the present invention can reduce the intake throttling loss in the high load region, and the throttling loss of the intake cylinder generates a strong negative pressure inside the combustion chamber, resulting in oil inflow into the combustion chamber through the piston ring portion and the valve system. To increase the oil consumption is to be able to prevent the increase of the oil consumption by the present invention.

As described above, the present invention has the effect of precisely controlling the throttling valve by electronic control of the bypass amount of the exhaust gas, thereby improving the fuel economy of the engine.

Claims (1)

In the waste gate which controls the compression level of the intake air by turning the turbine impeller by using the energy of the engine exhaust gas and bypassing the exhaust gas to the turbocharger which the compressor impeller connected coaxially with the turbine impeller compresses and supplies the intake air. , Turbocharger waste gate using an electronically controlled throttling valve, characterized in that the throttle valve that is opened and closed by an electronic actuator in the waste gate.