KR100482584B1 - Intake air duct open and shut control device of engine and method thereof - Google Patents

Abstract

The present invention constitutes an actuator for two-system intake air duct capable of duty control to overcome the shortcomings of a simple ON / OFF actuator used for opening and closing a secondary air inlet in a conventional intake system. An apparatus and method for controlling opening and closing of an intake air duct for use, comprising: a two-system intake air duct having a primary air inlet and a secondary air inlet; An opening / closing blocking film intermittent with a driving force mounted on the inner side of the secondary air inlet in the second system inlet air duct to control the flow of air introduced into the secondary air inlet; A map (MAP) sensor connected to the intake passage of the engine and detecting an absolute pressure of the intake air flowing therein; A controller configured to generate a duty control signal to gradually adjust the opening and closing of the opening and closing barrier layer according to the absolute intake air pressure input through the MAP sensor under the full load driving condition of the engine; And an actuator driven according to an input of a duty control signal supplied from the controller to open / close the opening / closing blocking film.

Description

Intake air duct opening and closing control device and method for an engine {INTAKE AIR DUCT OPEN AND SHUT CONTROL DEVICE OF ENGINE AND METHOD THEREOF}

The present invention relates to an intake air duct for an engine, and more particularly, to an apparatus and method for controlling the opening and closing of an intake air duct for an engine.

Typically, an intake air duct applied to an engine of a vehicle is one of important factors for determining the volumetric efficiency and greatly affects engine performance.

If the intake air duct is too narrow, the absolute amount of air supplied to the engine will be insufficient, leading to performance degradation, and if too wide, the wall area will be widened, resulting in an increase in air resistance and a decrease in air flow rate compared to the amount of air supplied. .

Therefore, developing an optimal intake system that balances these two factors is an important part of the engine development process.

Referring to Figure 1 will be described a two-system intake air duct 100 applied to the engine according to the prior art.

1 is a schematic diagram of a two-stage intake air duct 100.

Referring to FIG. 1, the engine speed is supplied only through the primary air inlet at low speed, and the amount of air insufficient at high speed is supplemented by opening the secondary air inlet.

The opening and closing of the secondary air inlet prevents the decrease of the flow rate of the intake air and the increase of the air resistance at low speed, and the supply of sufficient air at high speed constitutes the intake system of the high power engine.

In the two-stage intake air duct 100 according to the related art, the opening and closing of the secondary air intake is only in the ON / OFF form, so that the engine performance is drastically changed in the medium speed region.

Referring to FIG. 1, the opening / closing blocking film 102 is connected to an actuator 130 linked to driving of the solenoid valve 120 of the control unit 110 (ECU) and opened in the medium speed region of the engine speed, thereby allowing air of the secondary air intake port. Open the flow path.

As described above, since the opening / closing blocking film 102 operates in an ON / OFF manner, the intake absolute pressure MAP is greatly reduced immediately before the opening / closing blocking film 102 is opened, thereby lowering the air intake efficiency and Increasing pumping loss results in lower engine performance.

This is well represented in the performance curve of FIG.

Figure 2 shows the performance of the engine employing the two- system intake air duct 100, it can be seen the change in the torque and the intake absolute pressure (MAP; Manifold Absolute Pressure) with respect to the engine speed.

Immediately after the opening / closing blocking film 102 is opened, the intake absolute pressure MAP increases rapidly, and thus a sudden increase in engine torque occurs, thus requiring more effort to control the engine.

An object of the present invention can overcome the disadvantages of the simple ON / OFF actuator used to open and close the secondary air inlet in the existing intake system by configuring the actuator for the dual system intake air duct capable of duty control The present invention provides an intake air duct control device and method for an engine.

In order to achieve the above object, the present invention provides a control system for opening and closing the intake air duct for an engine, comprising: a second system intake air duct having a primary air inlet and a secondary air intake; An opening / closing blocking film intermittent with a driving force mounted on the inner side of the secondary air inlet in the second system inlet air duct to control the flow of air introduced into the secondary air inlet; A map (MAP) sensor connected to the intake passage of the engine and detecting an absolute pressure of the intake air flowing therein; A controller configured to generate a duty control signal to gradually adjust the opening and closing of the opening and closing barrier layer according to the absolute intake air pressure input through the MAP sensor under the full load driving condition of the engine; And an actuator driven according to an input of a duty control signal supplied from the controller to open / close an opening / closing barrier.

In addition, in order to achieve the above object, the present invention provides a method for controlling the opening and closing of an intake air duct for an engine, wherein the absolute pressure of the intake air flowing into the intake passage of the engine is detected to be within a range between the set pressures P1 and P2. Comparing corresponding numbers; Calculating an opening time ratio of the opening / closing membrane when the compared absolute intake air pressure falls within a range between the set pressures P1 and P2; Calculating a duty voltage based on the calculated opening time ratio; And supplying the calculated duty voltage to the actuator.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. While many specific details, such as the following description and the annexed drawings, are shown to provide a more general understanding of the invention, these specific details are illustrated for the purpose of explanation of the invention and are not meant to limit the invention thereto. And a detailed description of known functions and configurations that may unnecessarily obscure the subject matter of the present invention will be omitted.

Referring to Figure 3 will be described the configuration of the engine intake air duct opening and closing control apparatus according to an embodiment of the present invention.

Embodiment of the present invention, the engine intake air duct opening and closing control device, a two-stage intake air duct 300 having a primary air inlet and a secondary air inlet, opening and closing barrier 302, MAP sensor ( 310, the controller 320, the actuator 330 is configured.

The opening / closing blocking film 302 is interlocked with the driving force transmitted and mounted inside the secondary air intake port in the two-system intake air duct 300 to control the flow of air flowing into the secondary air intake port.

The MAP sensor 310 detects the absolute pressure of the intake air that is connected to the intake passage of the engine and supplies the corresponding signal to the controller 320.

The controller 320 generates a duty control signal to adjust the opening / closing of the opening / closing blocking film 302 stepwise according to the absolute intake air pressure input through the MAP sensor 310 in the full load driving condition of the engine.

For example, the control unit 320 corresponds to the set pressure (P1, P2) region in which the absolute intake air pressure value input from the MAP sensor 310 under the full load operation condition of the engine opens and closes the opening / closing blocking film 302. A duty control signal for opening and closing the opening / closing blocking film 302 is supplied to the lower surface actuator 330.

If the absolute intake air pressure input from the MAP sensor 310 is out of a range between the set pressures P1 and P2, the controller 320 blocks the duty control signal supplied to the actuator 330.

Here, the control unit 320 determines the opening time ratio of the opening / closing cut-off portion in the entire time according to the ratio between the absolute intake air pressure input from the map MAP sensor 310 and the set pressures P1 and P2. The duty control signal is supplied to the actuator 330.

The actuator 330 is driven in response to the input of the duty control signal supplied from the controller 320 to open and close the opening / closing blocking film 302.

The actuator 330 includes a step motor 332 and a wire 334.

The step motor 332 rotates in the set direction according to the input of the duty control signal supplied from the controller 320.

For example, the step motor 332 rotates counterclockwise or clockwise as shown in FIG. 3.

If the step motor 332 rotates in the counterclockwise direction, the opening / closing blocking film 302 maintains the closed state. If the step motor 332 rotates clockwise, the opening / closing blocking film 302 maintains the open state. .

One end of the wire 334 is coupled to the rotating part (motor shaft) of the step motor 332 and the other end thereof is coupled to the opening / closing blocking film 302 to connect the step motor 332 and the opening / closing blocking film 302 to each other. The opening / closing blocking film 302 is opened and closed according to the driving of the motor 332.

With the above configuration, the embodiment of the present invention eliminates a deep point on the torque curve by flexibly adjusting the opening and closing of the opening and closing blocking film 302 according to the intake absolute pressure in the full load operating condition of the engine.

In the prior art, it was not possible to avoid the deep point of torque by opening the opening and closing blocking film after the intake absolute pressure dropped significantly, but in the embodiment of the present invention, the opening and closing blocking film 302 is partially opened before the deep point is generated to increase the air intake amount. You can remove the deep point by zooming in.

3 to 5 will be described a method for controlling the opening and closing of the intake air duct for the engine according to an embodiment of the present invention.

Referring to FIG. 4, the controller 320 detects a full load operating condition state of the engine in S410.

Here, the full load operating condition state of the engine can be determined by detecting the depression state of the accelerator pedal or the opening state of the throttle valve.

In operation S410, if the full load driving condition is performed, the controller 320 proceeds to S420 and analyzes a signal input from the MAP sensor 310 to detect the absolute pressure of intake air flowing into the intake passage of the engine. Then, the detected intake absolute pressure corresponds to the range between the set pressures P1 and P2.

If the compared absolute intake air pressure falls within a range between the set pressures P1 and P2, the controller 320 proceeds to S430 and calculates an opening time ratio of the opening / closing blocking film 302.

Opening time ratio = (P1-absorption absolute pressure) / (P1-P2) * 100

Subsequently, the controller 320 proceeds to S440 and calculates a duty voltage based on the calculated open time ratio.

Duty voltage = (constant) * (open time ratio)

The controller 320 proceeds to S450 and supplies the calculated duty voltage to the actuator 330.

That is, when the intake absolute pressure value input from the MAP sensor 310 is in a region for opening / closing the opening / closing blocking film 302, the duty control for controlling opening and closing of the opening / closing blocking film 302 is started.

Here, the region for opening / closing the opening / closing blocking film 302 refers to a region where the intake absolute pressure is located between the first set pressure P1 and the second set pressure P2 shown in FIG. 5.

For reference, the method of controlling the opening / closing blocking film 302 is a method of controlling the ratio of the opening time and closing time of the opening / closing blocking film 302 in the same manner as the method of controlling the idle speed actuator (ISA). do.

Subsequently, the controller 320 proceeds to S460 to analyze a signal input from the MAP sensor 310 to redetect the absolute pressure of the intake air flowing into the intake passage of the engine, and redetect the absolute intake air pressure. Compare whether the pressure falls within the range between the set pressures P1 and P2.

If the compared absolute intake air pressure is out of the range between the set pressures P1 and P2, the controller 320 blocks the duty control signal supplied to the actuator 330.

That is, the controller 320 determines the opening time ratio of the opening / closing blocking film 302 at the entire time according to the ratio between the intake absolute pressure and the first and second set pressures P1 and P2, and according to the determined opening time ratio. The duty voltage supplied to the actuator 330 is determined.

When the intake absolute pressure is out of the range between the first set pressure P1 and the second set pressure P2, the duty voltage supplied to the actuator 330 is cut off to end the duty control.

FIG. 5 is a diagram illustrating a change in torque and intake absolute pressure (MAP) with respect to engine speed of an engine employing a two-system intake air duct 300 according to an exemplary embodiment of the present invention.

Referring to FIG. 5, an embodiment of the present invention can eliminate a sudden decrease and change in absolute intake air pressure (MAP) as in the conventional manner, and as a result, increase in pumping loss and decrease in intake efficiency of the engine can be avoided.

It smoothly changes the absolute intake air pressure (MAP) and torque according to the engine rotation speed to improve the performance of the engine and is advantageous for engine control.

The two-system air duct 300 is very effective for engines used in high-powered vehicles, rather than general engines.

As described above, the engine intake air duct control device and method according to the present invention can induce a change in the smooth intake absolute pressure (MAP) at the time of opening and closing the blocking film compared to the conventional two-system intake air duct, so the engine intake Since the efficiency and torque can be increased, there is an effect applicable to the intake air duct of a high power engine.

1 is a view showing the configuration of an intake air duct control device for an engine according to the prior art.

2 is a view showing a change in torque and intake absolute pressure (MAP) with respect to the engine speed of an engine employing a two-system intake air duct according to the prior art;

Figure 3 is a view showing the configuration of the intake air duct control device for the engine according to an embodiment of the present invention.

Figure 4 is a flow chart illustrating a control method for opening and closing the intake air duct for the engine according to an embodiment of the present invention.

5 is a view showing a change in torque and intake absolute pressure (MAP) with respect to the engine speed of an engine employing a two-system intake air duct according to an embodiment of the present invention.

Claims (8)

In the intake air duct control device for the engine, A two-system intake air duct having a primary air intake port and a secondary air intake port; An opening / closing blocking film intermittent with a driving force mounted on the inner side of the secondary air inlet in the second system inlet air duct to control the flow of air introduced into the secondary air inlet; A map (MAP) sensor connected to the intake passage of the engine and detecting an absolute pressure of the intake air flowing therein; A controller configured to generate a duty control signal to gradually adjust the opening and closing of the opening and closing barrier layer according to the absolute intake air pressure input through the MAP sensor under the full load driving condition of the engine; And an actuator driven according to an input of a duty control signal supplied from the control unit to open and close an opening and closing blocking film. The method of claim 1, wherein the actuator A step motor rotating in a set direction according to an input of a duty control signal supplied from the controller; One end is coupled to the rotating part of the step motor is wound, the other end is coupled to the opening and closing barrier film to interconnect the step motor and the opening and closing barrier film comprising a wire for opening and closing the opening and closing barrier film according to the driving of the step motor Intake air duct control device for the engine, characterized in that. The actuator of claim 1, wherein the controller is configured to control the actuator when the absolute value of the intake air pressure input from the MAP sensor corresponds to a set pressure P1 or P2 region for opening / closing the opening / closing membrane. Intake air duct opening and closing control device for an engine, characterized in that for supplying a duty control signal for opening and closing the opening and closing blocking film. The method of claim 3, wherein the control unit determines the opening time ratio of the opening / closing cut-off portion in the total time according to the ratio between the absolute intake air pressure input from the MAP sensor and the set pressures P1 and P2. Intake air duct control device for the engine, characterized in that for supplying the duty control signal according to the actuator. The method of claim 3, wherein the control unit blocks the duty control signal supplied to the actuator when the absolute intake air pressure input from the MAP sensor is out of a range between the set pressures P1 and P2. Intake air duct control for engine. In the engine intake air duct opening and closing control method having a configuration of claim 1, Detecting an absolute pressure of the intake air flowing into the intake passage of the engine and comparing whether the pressure falls within a range between the set pressures (P1, P2); Calculating an opening time ratio of the opening / closing membrane when the compared absolute intake air pressure falls within a range between the set pressures P1 and P2; Calculating a duty voltage based on the calculated opening time ratio; And supplying the calculated duty voltage to the actuator. The method of claim 6, wherein the detecting of the absolute pressure of the intake air and comparing the set pressure with the set pressure is performed under full load operating conditions of the engine. The intake air duct opening and closing of the engine according to claim 6, further comprising the step of blocking a duty control signal supplied to the actuator when the intake absolute pressure is out of a range between the set pressures P1 and P2. Control method.