KR20050060916A - Engine hesitation control device of diesel engine and method thereof - Google Patents

Abstract

The present invention relates to an apparatus and method for controlling relief of a diesel engine, which can significantly reduce noise and vibration of a diesel engine by blocking an intake flow flowing into a cylinder automatically when the diesel engine is turned off. A key switch for generating an electrical signal; An engine speed sensor for detecting an engine speed of the diesel engine and generating a corresponding electric signal; A throttle valve mounted on the intake passage of the diesel engine to regulate the intake flow flowing into the cylinder as it is opened and closed; A controller configured to analyze signals input through the key switch and the engine speed detection sensor, respectively, and generate an intake cut control signal when the key is off and the engine speed is lower than the set speed; It is mounted to the intake passage of the diesel engine, and is configured to include an intake passage blocking drive unit which is driven in accordance with the input of the intake blocking control signal supplied from the control unit to keep the intake passage closed.

Description

ENGINE HESITATION CONTROL DEVICE OF DIESEL ENGINE AND METHOD THEREOF

The present invention relates to an apparatus and method for controlling a relief of a diesel engine.

Typically, diesel engines only inhale air into the cylinder and inject fuel through injection nozzles and injectors into the air compressed at high temperature and high pressure at the end of the compression stroke.

At this time, when the temperature of the air sucked into the cylinder is higher than the fuel self-ignition temperature, the injected fuel is atomized evaporated in the compressed hot air, so the optimum mixing ratio capable of self-ignition is formed in the combustion chamber and combustion starts.

This is called compression autoignition, and the fuel injected thereafter continues by forming a spray jet and mixing it with the surrounding air.

Therefore, combustion of diesel engines is important to ensure that fuel and air are well mixed.

The injection method of a diesel engine uses a direct injection method in which only air is sent from an intake manifold to directly inject fuel into a cylinder during an intake stroke.

The reason for this is that it is possible to reduce the fuel consumption and exhaust gas, and to operate comfortably and quietly compared to general pre combustion engines.

However, engine hesitation occurs due to the remaining fuel amount and the sucked air when the diesel engine is turned off (Key Off), and customer dissatisfaction occurs.

That is, in the case of the diesel engine according to the prior art, there is a problem that excessive noise and vibration occurs in the diesel engine because the fuel remaining at the time of key off does not have an intake control system and is burned in response to the sucked air.

It is an object of the present invention to provide an apparatus and method for controlling relief of a diesel engine, which can significantly reduce noise and vibration of a diesel engine by blocking an intake flow flowing into a cylinder automatically when the diesel engine is turned off.

In order to achieve the above object, the present invention provides a relief device for a diesel engine, comprising: a key switch for generating an electric signal corresponding to a switching state; An engine speed sensor for detecting an engine speed of the diesel engine and generating a corresponding electric signal; A throttle valve mounted on the intake passage of the diesel engine to regulate the intake flow flowing into the cylinder as it is opened and closed; A controller configured to analyze signals input through the key switch and the engine speed detection sensor, respectively, and generate an intake cut control signal when the key is off and the engine speed is lower than the set speed; It is mounted to the intake passage of the diesel engine, characterized in that it comprises a intake passage blocking drive unit which is driven in accordance with the input of the intake block control signal supplied from the control unit to maintain the intake passage in a closed state.

In addition, to achieve the above object, the present invention provides a method for controlling the relief of a diesel engine, comprising: detecting a switching state of a key switch; Detecting an engine speed by analyzing a signal input through an engine speed sensor if the key is in the off state; When the detected engine speed is less than or equal to the set speed, it is characterized in that it comprises the step of supplying the intake passage control signal to the intake passage blocking drive unit to maintain the throttle valve mounted in the intake passage in a closed state.

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.

An embodiment of the present invention relates to a control apparatus and a control method of the engine relief phenomenon at the start-off of a diesel engine, to prevent the engine relief phenomenon by using an intake control system and control logic in the diesel engine.

1 is a view showing the configuration of the relief control apparatus of a diesel engine according to an embodiment of the present invention.

1, an embodiment of the present invention is a relief control apparatus for a diesel engine, the key switch 110 (Key Switch), the engine speed detection sensor 120, the throttle valve 130 (Throttle Valve), The control unit 140 includes an engine control unit (ECU) and an intake passage blocking driving unit 150 to 160.

The key switch 110 generates an electrical signal corresponding to the switching state to supply power required for driving the diesel engine and the electrical load device.

The engine speed detection sensor 120 detects the engine speed of the diesel engine and generates a corresponding electrical signal.

The throttle valve 130 functions to control the intake air flow into the cylinder as the throttle valve 130 is mounted and opened in the intake passage of the diesel engine.

That is, the throttle valve 130 is installed inside the intake manifold constituting the intake passage, and intermittently intercepts the flow of air sucked while rotating about the central axis crossing the center.

The control unit 140 is configured as a microprocessor for performing the overall control operation related to the relief control of the diesel engine according to an embodiment of the present invention, in the embodiment of the present invention, the key switch 110 and the engine speed detection sensor 120 By analyzing the respective input signals through the) and the key off state and the engine speed is less than the set speed, it functions to generate an intake cut control signal.

The intake passage blocking driving units 150 to 160 are mounted in the intake passage of the diesel engine, and are driven in response to the input of the intake blocking control signal supplied from the controller 140 to maintain the intake passage in a closed state.

The intake passage blocking drive unit 150 to 160 includes a throttle solenoid valve 150 and a throttle valve actuator 160.

The throttle solenoid valve 150 is driven in response to the input of an intake cutoff control signal supplied from the controller 140 to move the rod 152.

The throttle valve actuator 160 is interlocked with the rod 152 of the throttle solenoid valve 150 to control the opening and closing movement of the throttle valve 130.

Throttle valve actuator 160 is composed of a spring and a metal or non-metal membrane installed on the top of the spring is connected to the membrane rotatably according to the displacement of the internal pressure is connected to the throttle valve 130, a separate rod 162 (Throttle Valve Actuator Rod) can be configured to reciprocate.

2 is a flowchart illustrating a relief control method of a diesel engine according to an exemplary embodiment of the present invention, and FIG. 3 is a diagram illustrating a signal flow input and output to the controller 140 according to an exemplary embodiment of the present invention.

Referring to FIG. 3, when the key switch 110 is switched from a key on state to a key off state, the power latch of the controller 140 is turned on. Can be.

In addition, it is understood that the time when the throttle solenoid valve 150 is driven is a time when the engine speed decreases from the idle speed to the set speed 400 rpm.

4 is a relief control block diagram of a diesel engine according to an embodiment of the present invention.

Referring to FIG. 4, a signal input to the controller 140 includes a key switch signal (Key On → Off), an engine speed reduction signal (Engine rpm Reduction), a fuel injection signal (Q _sol = 0), and a vehicle speed signal (VSP). = 0 kph), and the power latch signal (Power Latch Off → On).

A method of controlling relief of a diesel engine according to an exemplary embodiment of the present invention will be described with reference to FIGS. 1 to 4.

First, the control unit 140 detects the switching state of the key switch 110 (S210).

Subsequently, in the key off state, the engine speed is detected by analyzing a signal input through the engine speed detection sensor 120 (S212).

If the detected engine speed is less than or equal to the set rotation speed, the intake passage blocking control unit 150 to 160 supplies an intake blocking control signal to maintain the throttle valve 130 mounted in the intake passage in a closed state. (S214, S216).

For reference, the set speed according to the embodiment of the present invention is 400rpm, and refers to the engine speed corresponding to the time when the throttle solenoid valve 150 is driven.

That is, when the engine speed is reduced from the idle (Idle rpm) is 400rpm throttle solenoid valve 150 is driven.

The power latch operation time of the controller 140 is set to about 10 seconds.

In addition, the supply time of the intake cutoff control signal supplied to the throttle solenoid valve 150 is set to about 2 seconds.

As described above, the controller 140 generates an intake cutoff control signal for closing the throttle valve 130 at the same time as the start-off of the diesel engine.

At this time, the throttle solenoid valve 150 constituting the intake passage blocking drive unit 150 to 160 is driven in response to the input of the intake blocking control signal supplied from the controller 140 to connect the rod 152 connected to the throttle valve actuator 160. Drive.

The throttle valve actuator 160 is interlocked with the driving force from the rod 152 of the throttle solenoid valve 150 and maintains the throttle valve 130 in a closed state through a rod 162 provided separately.

That is, at the same time as the start-off, the throttle valve 130 is switched from the open state to the closed state, and rapidly blocks the air flowing into the cylinder through the throttle valve 130.

According to such a control operation, the noise and vibration of the diesel engine due to the resonance generated at the start-off of the diesel engine can be significantly reduced.

As described above, the apparatus and method for controlling the relief of a diesel engine according to the present invention prevents engine relief from occurring when the engine key is off by automatically blocking intake when the diesel engine is turned off. It works.

In addition, there is an effect that can improve the durability of the diesel engine by reducing unnecessary noise and vibration when the engine off (Key Off).

1 is a view showing the configuration of the relief control apparatus of a diesel engine according to an embodiment of the present invention.

2 is a flowchart illustrating a relief control method of a diesel engine according to an exemplary embodiment of the present invention.

3 is a diagram illustrating a signal flow input and output to a control unit according to an embodiment of the present invention.

4 is a relief control block diagram of a diesel engine according to an embodiment of the present invention.

Claims (4)

In the relief control device of the diesel engine, A key switch for generating an electric signal according to the switching state; An engine speed sensor for detecting an engine speed of the diesel engine and generating a corresponding electric signal; A throttle valve mounted on the intake passage of the diesel engine to regulate the intake flow flowing into the cylinder as it is opened and closed; A controller configured to analyze signals input through the key switch and the engine speed detection sensor, respectively, and generate an intake cut control signal when the key is off and the engine speed is lower than the set speed; It is mounted on the intake passage of the diesel engine, and driven in response to the input of the intake block control signal supplied from the control unit comprises an intake passage blocking drive unit for maintaining the intake passage closed state, it characterized in that the relief control of the diesel engine Device. According to claim 1, wherein the intake passage blocking drive unit A throttle solenoid valve driven according to an input of an intake cutoff control signal supplied from the controller to move a rod; And a throttle valve actuator configured to interlock with the rod of the throttle solenoid valve to control the movement of the throttle valve. The throttle valve actuator of claim 2, wherein the throttle valve actuator is And a spring mounted inside the housing, and a membrane installed on the upper portion of the spring, which is rotatably connected to the membrane according to the displacement of the internal pressure to reciprocate a separate rod connected to the throttle valve. Relief control device of diesel engine. In the relief control method of the diesel engine, Detecting a switching state of the key switch; Detecting an engine speed by analyzing a signal input through an engine speed sensor if the key is in the off state; If the detected engine speed is less than or equal to the set rotation speed, supplying an intake cutoff control signal to the intake passage blocking drive unit, and maintaining the throttle valve mounted in the intake passage in a closed state. Way.