KR100250201B1 - Fuel cut protection control device - Google Patents

Abstract

PURPOSE: A device for controlling prevention of block of fuel spraying is provided to prevent evaporation and bubble formation of fuel in an injector through connecting a solenoid valve of a press regulator toward atmospheric side in case of high temperature in water or sucked air of a vehicle. CONSTITUTION: A vehicle contains a sensor unit including a cooling water temperature sensor(G) detecting temperature of an engine cooling water; a throttle location sensor(H) detecting locations of a throttle valve in an idling state and a high load state; a sucked air temperature sensor(F) detecting temperature of sucked air of an engine; and an rpm(revolutions per minute) sensor of the engine. By receiving output signals from the sensor unit, an inner temperature, rpm of the engine, and opened state of the throttle valve are decided. After a specific time from starting the engine, the injector temperature is detected. In case of the temperature under an established temperature for generating bubbles and evaporating fuel in the injector, pressure is applied to the injector for closing a solenoid valve by a negative pressure. The fuel is discharged to a surge tank(10) or a fuel storing instrument.

Description

Fuel injection blocking control device

The present invention relates to a fuel injection cutoff prevention control device, and more particularly, to a fuel injection cutoff prevention control device when the state of water temperature and intake temperature of a vehicle is high.

The fuel injection is to inject the fuel into the air of the inlet port under high pressure and spraying. The torque generated by the engine is determined by the amount of fuel burned and injected into the combustion chamber to obtain the engine rotation speed and output. Precise control.

In the transient state such as acceleration, the fuel is supplied to the engine by supplying fuel suitable for the amount of air sucked into the combustion chamber of the engine.In the transient state such as the acceleration, the detection delay of the air amount is calculated and the delay until the fuel is injected into the intake pipe and returned to the fuel chamber. Since the fuel supply to the fuel chamber is delayed with respect to the change in the intake air amount, the air-fuel ratio is optimally maintained.

At this time, the fuel injection device performs fuel weight when the acceleration state is detected, and the intake pipe input signal indicating the opening degree of the throttle and the intake pipe input signal indicating the intake air amount and One of the signals, such as the intake air amount signal indicating the intake air amount, is used, and the rapid or slow acceleration state is detected when the amount of change of the signal is greater than the threshold for rapid acceleration or slow acceleration determination at regular intervals.

1 is a connection configuration diagram of a vehicle injector flow control apparatus according to a conventional embodiment.

This conventional technique is to control the injection time of the injector by selectively changing the flow characteristics, the study of the utility model of the Korean Intellectual Property Office (published by the date of the publication date; August, 1992, August 27, 1992) Device ”.

This conventional technique is a flow control device in which the diaphragm is operated by the fuel flowing from the fuel pump as shown in FIG. 1 so that the pressure of the fuel flowing into the injector is constantly controlled by a constant elastic force of the elastic member. The elastic member (H) is elastically installed via the elastic wax (1) with the main body, and the electrical signal is input to the ECU (3) by the expansion and contraction of the wax (1) variable resistance and the wax The water jacket 6 having the ports 4 and 5 formed thereon is fixedly installed so that the cooling water flows in and out of the main body side into which the water is inserted and fixed so that the wax 1 shrinks or expands according to the temperature of the cooling water. It is configured to adjust the fuel injection time of the injector 2 by the output signal of the ECU 3 according to the change of the flow rate characteristic.

In this conventional technique, the ball valve (E) is spaced from the plug (J) as the diaphragm (D) overcomes the elastic force of the elastic member by the fuel flowing from the fuel pump so that the pressure fuel is injected into the injector (2). Supplied.

The injector 2 injects fuel. At this time, when the temperature of the cooling water flowing in the water jacket 6 rises, the wax 1 expands and the elastic force of the elastic member H is caused by the action of the diaphragm D. When (E) approaches the plug (J) is introduced into the injector (2) to increase the pressure of the fuel.

However, such a conventional technique is to stop the engine at the time of climbing or at low speed, and when the fuel temperature near the injector rises to 100 ° C or more after a while, this causes a vaporization (VAPOR) in the fuel pipe, that is, gasification and bubbles, resulting in the fuel system. As the bumper passes through the parts of the system, it causes the VAPOR-LOCK.

Therefore, when this engine is operated in this state of the banfer lock, when the injector is opened, the inlet pressure of the solenoid valve is momentarily close to atmospheric pressure. At that moment, a severe bumper is generated, and the fuel in the injector is gasified to generate air bubbles. The problem is that the amount of fuel suddenly drops and the engine does not start.

The present invention has been made in order to solve such a conventional problem, the purpose is to connect the solenoid valve of the press regulator to the atmosphere when the temperature of the water temperature and intake temperature of the vehicle is high temperature, the pressure in the fuel pipe above the set pressure In order to prevent vaporization and bubbles generated in the fuel in the injector in advance.

1 is a connection configuration diagram of a vehicle injector flow control apparatus according to a conventional embodiment.

2 is a connection configuration of a fuel injection blocking prevention control device according to an embodiment of the present invention.

3 is a connection block diagram of the electronic control apparatus of the fuel injection blocking prevention control apparatus according to the embodiment of the present invention.

4 is a flowchart of a control method for controlling a fuel injection blocking prevention control apparatus according to an embodiment of the present invention.

* Explanation of symbols for main parts of the drawings

1: wax 2, I: injector

3; C, 200: electronic control unit 4,5: port

6: water jacket 10: surge tank

20: throttle valve H: elastic member

D: Diaphragm E: Ball Valve

F: Intake air temperature sensor G: Cooling water temperature sensor

H: Throttle position sensor J: Plug

P: Pressure regulator T: Fuel tank

100: sensor unit 300: fuel injection unit

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

2 is a connection block diagram of the fuel injection blocking control device according to an embodiment of the present invention, Figure 3 is a connection block diagram of the electronic control device of the fuel injection blocking control device according to an embodiment of the present invention, FIG. Is a flowchart of a control method for controlling a fuel injection blocking prevention control device according to an embodiment of the present invention.

The present invention is to control the pressure of the fuel to prevent the fuel injection is blocked by the fuel injection of the fuel, as shown in Figure 2, the engine is mounted on a vehicle, such as an automobile and the air for combustion throttle valve (20) ) Suction tank (10) is connected to suck through in turn, and when idle (idling) to the throttle valve 20 is closed, and is supplied by the fuel pump from the fuel tank (T) and the fuel pressure regulator (P) The fuel adjusted to the predetermined injection fuel pressure is supplied by simultaneous injection via an injector (I) provided corresponding to each cylinder of the engine and connected to be sucked into the engine by the intake air.

However, the exhaust gas after combustion is discharged to the atmosphere through the exhaust discharge means.

Referring to FIG. 2 or 3, reference is made to a cooling water temperature sensor (G) for detecting the cooling water temperature of the engine, a throttle position sensor (H) for detecting the opening degree of the throttle valve, and a surge tank (10). The intake air temperature sensor F which detects the temperature, and each detection signal are supplied to the electronic control unit C. The electronic control unit C determines the fuel injection amount based on the output signals thereof, and the pressure regulator P of the fuel injection unit. Is injected at the same time through the injector (I) installed corresponding to each cylinder of the engine so that the pressure applied to the injector is adjusted.

In addition, the present invention is a sensor for detecting the cooling water temperature of the engine, a built-in thermistor, the cooling water temperature sensor for outputting the resistance value change of the thermistor, the throttle position sensor for detecting the idling state and the high load state in the position of the throttle valve, respectively, the engine suction An intake temperature sensor for detecting a temperature to be measured, a sensor unit 100 having a rotational speed sensor of an engine, and an A / D converter for converting an analog output signal output from the sensor unit 100 into a digital value in turn; The electronic control unit 200, and the fuel injection unit 300 for driving the solenoid valve to the output terminal of the electronic control unit 200.

The electronic controller 200 is connected to the output terminal of the A / D converter for converting the output signal of the cooling water temperature sensor, the throttle position sensor, the intake air temperature sensor, and the engine speed sensor into the digital detection signal at each input port. In order for the output port to send a reference signal to increase the pressure of the fuel, the pressure regulator adjusts the opening and closing of the solenoid valve to increase the injection pressure.

4 is a diagram illustrating a control method of the electronic controller of FIG. 3. When the driver starts the vehicle, the electronic controller operates a timer function to read an output signal of various sensors connected to the input terminal after a predetermined time to check the state of the vehicle. You will begin to check.

The electronic control unit inputs signals output from the coolant temperature sensor, the intake air temperature sensor, the rotational speed sensor, and the throttle position sensor to detect the engine image of the vehicle at the same time that the vehicle starts up, and the electronic controller inputs the signals to the respective temperatures, speeds, and openings. The driving status is determined by comparing the steady state with the set value.

If the electronic controller determines that the cooling water temperature and the intake air temperature are higher than the set value, and the engine speed is smaller than the set reference engine speed and the current throttle opening state is smaller than the set reference throttle opening state, the electronic The control unit raises the pressure by injecting pressure into the injector through the pressure regulator at the output stage to prevent bubbles and vaporization of the injected fuel in the injector, thereby causing the solenoid valve to be closed by the negative pressure so that the fuel flows into the surge tank means. At the same time, the remaining excess fuel is sent to the fuel storage means over the set fuel pressure through the return pipe.

On the other hand, when the driving condition is normal, that is, when the signal output from the various sensors is low temperature, high rotation, and high opening degree compared to the set reference value, the pressure regulator adjusts the pressure in the injector to be a constant value (2.55kgf / ㎠).

The present invention, which acts as described above, increases the pressure in the injector through the pressure regulator to prevent air bubbles and vaporization of the fuel in the injector when the engine of the vehicle is at a high temperature, and thus has difficulty in restarting and accelerating due to the vaporization phenomenon. It is to provide an effect to prevent the back to occur in advance.

Claims (1)

Cooling water temperature sensor to detect the cooling water temperature of the engine, a throttle position sensor to detect the idling state and the high load state respectively in the position of the throttle valve, an intake air temperature sensor to detect the temperature of the engine intake, the engine speed sensor In an additionally mounted vehicle, the output signal of the sensor unit is input to determine an internal temperature setting, an engine speed, and an opening state of the trot valve, and output the sensor unit after a predetermined time when the vehicle is started. If the injection fuel in the injector is below the standard value that is expected to generate bubbles and vaporization, it outputs an electrical signal to the pressure regulator at the output stage and pressurizes the injector so that the solenoid valve is closed by the negative pressure and the fuel is closed. The electronic control unit for controlling the discharge to the fuel saving means is connected Luer Jean fuel injection blocking prevention control device.

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