KR20010044969A - fuel control valve and fuel control method in idle state of a diesel vehicle - Google Patents

Abstract

PURPOSE: A valve and a method for controlling fuel for flow amount control of fuel required idle driving in a diesel car are provided to reduce fuel amount by controlling a flow amount of fuel by exactly calculating rotational frequency of an engine during an idle operation in a diesel car. CONSTITUTION: A valve for controlling fuel for flow amount control of fuel required idle driving in the diesel car includes a control lever(3), a linear solenoid idle adjusting element(6) and a maximum speed control screw(2). The control lever is rotated on a central fixing point and connected to an acceleration cable. The linear solenoid idle adjusting element increases or decreases fuel according to load requiring idle by laterally changing a length at an upper end of the valve. The maximum speed control screw fixes fuel, injected at the time of the maximum speed, to a lower end. And a method includes the steps of sensing various loads required for fuel control, comparing and determining throttle position sensor value sensed in the above step with idle determining opening value and returning to the first step if it is not idle driving, comparing and determining throttle position sensor value sensed in the second step with idle determining opening value and comparing engine target rotational frequency with the current engine rotational frequency if it is idle driving, returning to the first step if engine target rotational frequency and the current engine rotational frequency are equal, increasing the fuel amount if the engine target rotational frequency is larger than the current engine rotational frequency, reducing the fuel amount if the engine target rotational frequency is smaller than the current engine rotational frequency, and returning to the first step and repeating the above steps.

Description

Fuel control valve and fuel control method in idle state of a diesel vehicle

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fuel control valve and a method for controlling fuel flow required for idle driving of a diesel vehicle, and in particular, to control fuel according to various load conditions, and in particular, to control required fuel in accordance with various load conditions. The present invention relates to a fuel flow control method required during idle of a diesel vehicle having an environmental advantage by saving fuel by accurately following the rotational speed and reducing emission gas.

Diesel vehicles, like gasoline vehicles, are a type of internal combustion engine that converts chemical energy of fuel directly into effective mechanical work in a combustion chamber. The gasoline vehicle is an external ignition system that compresses the mixer and supplies ignition / combustion by supplying sparks from the outside, whereas a diesel engine first compresses only air to form high temperature air, and then supplies fuel in the high temperature and high pressure air. When injected, the fuel self-ignites and explodes in combustion. In other words, the diesel engine is a self-ignition engine. Therefore, gasoline vehicles require an essential electric ignition device. The other basic structure of a diesel vehicle is the same as that of a gasoline vehicle.

In a vehicle, idling driving means that the engine is running at no load, where no load is running the engine in a neutral state without shifting the transmission.

The fact that the required engine speed varies depending on various loads and conditions during idle operation is well known to those skilled in the art and will not be described in detail any further.

As shown in FIG. 1, the required engine speed also varies according to the water temperature of the engine coolant, so the fuel flow rate required also varies.

However, up to now, in diesel vehicles, children have defined when the value of the throttle positon sensor is below a certain set value. In the diesel engine, in the idle area below this set value, various loads required for idling operation are required. It is configured to supply a constant fuel regardless.

2 schematically shows a mounting diagram of a fuel control valve for supplying a conventional fuel. As shown the fuel control valve comprises an idle adjustment screw (1), a maximum speed adjustment screw (2), and a control lever (3) which is pivotable about a center fixation point (3), the idle adjustment of a diesel vehicle The screw (1) and the top speed adjusting screw (2) are fixed and manufactured from an initial stage of manufacture. This fuel regulating valve is made to increase or decrease the fuel by an acceleration cable (not shown) connected to the acceleration cable connector 5 when the control lever 3 is turned counterclockwise about the center fixed point 4. When turning in the direction, fuel is added or subtracted conversely. However, since the idle adjustment screw (1) and the maximum speed adjustment screw (2) are manufactured from the initial stage of manufacture, only a certain amount of fuel is injected regardless of the state of the vehicle when idle driving or driving at the highest speed. .

However, in the conventional diesel vehicle as described above, in the fuel supply during idle operation, the fuel is unnecessary at or below the required rotational speed by supplying a constant flow rate of fuel regardless of the fuel flow rate required to operate the rotational speed required by the diesel vehicle. Waste was caused, there was a problem that can not cope with various loads sensitively because less fuel is supplied at the required rotation speed.

Accordingly, the present invention is to solve the problems of the prior art as described above, an object of the present invention is to accurately track the engine speed for coping with various loads during idle operation in a diesel vehicle, thereby adjusting the fuel flow rate It is to provide a fuel flow control method required for idle driving of a diesel vehicle that can not only reduce the cost but also improve the convenience of the various devices and the merchandise of the vehicle.

1 is a target engine speed according to the coolant water temperature,

Figure 2 is a conventional fuel control valve mounted view,

3 is a flowchart illustrating a fuel flow control method required for idle driving of a diesel vehicle according to an embodiment of the present invention, and

4 is a schematic mounting view of a fuel control valve according to an embodiment of the present invention.

-Explanation of symbols for the main parts of the drawing-

1: idle adjustment screw 2: top speed adjustment screw

3: control lever 6: linear solenoid idle adjustment element

In order to achieve the above object, the present invention,

A fuel control valve and method for controlling a required fuel flow rate by comparing a required engine target speed with a current speed,

The fuel control valve has a control lever connected to an acceleration cable on one side and pivoted about a fixed point in the center, and a linear solenoid idle adjustment element which can be changed in length from side to side on the top to increase or decrease fuel according to a load required by the children. And a top speed adjustment screw for fixing fuel injected at the top speed at the bottom,

The fuel control method when driving idle

(1) detecting and inputting an engine speed, a throttle position sensor, a coolant temperature, and various loads necessary for fuel control at an arbitrary time;

(2) comparing the throttle position sensor value inputted in the step (1) with the idle determination opening value value and returning to the step (1) if it is not the idle driving determination;

(3) comparing the throttle position sensor value input in the step (2) with the idle determination opening value, and comparing the engine target rotational speed with the current engine rotational speed when idling;

(4) returning to step (1) if the engine target rotational speed and the current engine rotational speed in step (3) coincide;

(5) increasing the fuel amount by the linear solenoid idle adjustment element in the fuel control valve if the engine target speed is determined to be greater than the current engine speed in step (3);

(6) reducing the amount of fuel by the linear solenoid idle adjustment element in the fuel control valve if it is determined in step (3) that the engine target speed is less than the current engine speed;

And (7) returning to the step (1) after the steps (5) and (6), and repeating the step (1).

Hereinafter, with reference to the accompanying drawings will be described in detail a fuel flow control method required when the idle of the diesel vehicle according to an embodiment of the present invention.

In describing the present embodiment, the same reference numerals are used for the same constituent parts as in the prior art, and redundant description will be omitted and the focus will be mainly on the improved parts.

3 is a flowchart illustrating a method for controlling fuel flow rate required for idle driving of a diesel vehicle according to an exemplary embodiment of the present invention. As shown, when the diesel vehicle starts running, the program is started (7), and the current engine speed and throttle position sensor, the coolant water temperature, and various loads inside the vehicle are measured and input by various sensors of the vehicle (8). Performing a first judgment (9) of comparing the throttle position sensor input after the input (8) with the idle determination opening value, if the input throttle position sensor value is larger than the idle determination opening value. If the current throttle position sensor value is less than or equal to the idle determination opening value, since the driving is not idle, the following operation (2) is performed. do. When the engine target speed is equal to the current engine speed in the second determination (10) compared with the engine target speed required by the current diesel vehicle and the initially input engine speed (engine target RPM-current engine = 0, (△ RPM = 0)) is operated without increase or decrease of fuel.If the engine target speed is smaller than the current target speed (△ RPM∠0), the fuel is fueled because the current operation is the over-fueled operation. The fuel ramping step 11 is repeated so that the current engine speed matches the engine target speed using the linear idle solenoid idle adjustment element in the control valve. If the engine target speed is greater than the current engine speed (ΔRPM> 0), the fuel shortage is required. Therefore, the fuel increase / decrease step 12 is performed by using the linear solenoid idle adjustment element so that the current engine speed is reached to the engine target speed. Repeat.

4 shows a fuel control valve mounting diagram comprising a linear solenoid idle adjustment element according to the invention.

As shown, the fuel control valve according to the present invention, the maximum speed adjustment screw 2, the control lever 3 and the conventional idle adjustment screw 1 as described in FIG. It includes replacing with the solenoid idle adjustment element 6. The increase and decrease of fuel is the same as in the prior art, but the linear solenoid adjusting element 6 is automatically operated when the engine target speed is greater than the current engine speed, compared to the conventional technology in which a fixed fuel is injected during idle operation. As the length increases, the control lever 3 is pivoted counterclockwise around the fixed point 4 so that fuel is supplied by an acceleration cable (not shown) connected to the acceleration cable connector 5 on one side of the control lever 3. The engine target speed is increased until the current engine speed is the same, and if the fuel excess when the current engine speed is greater than the engine target speed, the length of the linear solenoid idle adjustment element 6 is reduced, so that the control lever 3 ) Is turned clockwise so that the fuel is added or subtracted until the current engine speed becomes the same.

In the fuel flow control method requiring the idleness of the diesel vehicle according to the present invention as described above, by replacing the conventional fixed idle adjustment screw with a linear solenoid idle adjustment element to compare the target engine speed of the engine with the current engine speed The increase and decrease of the fuel is automatically judged.

Therefore, the present invention accurately follows the engine target rotational speed according to various load conditions and driving conditions during idle driving of a diesel vehicle, thereby not only saving fuel by adjusting fuel flow rate, but also improving convenience and vehicle convenience of various devices. Provided is a fuel flow control method required for idle driving of a diesel vehicle.

In the above, the present invention has been described in accordance with some preferred embodiments of the present invention, but the present invention is not limited to the described embodiments, and variously modified within the scope of the technical scope defined by the spirit and claims of the present invention. Modifications and variations are apparent to those skilled in the art.

Claims (2)

In the fuel control method for controlling the flow rate of the fuel required by comparing the engine target rotational speed and the current rotational speed required for idle driving, (1) At any point of time, detecting engine speed, throttle position sensor, coolant water temperature, various loads, and the like necessary for fuel control. (2) Comparing and determining the throttle position sensor value detected in the step (1) and the idle determination opening value value, and returning to the first step if the determination is not made during idle driving. (3) comparing the throttle position sensor value inputted in step (2) with the idle determination opening value and comparing the target engine speed with the current engine speed in the case of idle operation. (4) Returning to step 1 if the engine target speed and the current engine speed match in step (3). (5) increasing the fuel amount by the linear solenoid idle adjustment element in the fuel control valve if the engine target rotation speed is determined to be greater than the current engine speed in the step (3). (6) reducing the amount of fuel by the linear solenoid idle adjustment element in the fuel control valve if it is determined in step (3) that the engine target speed is less than the current engine speed. And (7) returning to step 1 after the steps (5) and (6) and repeating the step. In the fuel control valve for controlling the flow rate of the fuel required by comparing the engine target rotational speed and the current rotational speed required during idle operation, The fuel control valve includes a control lever pivoted about a center fixed point and connected to an acceleration cable at one side; A linear solenoid idle adjustment element that can vary in length from side to side at the top to increase or decrease the fuel to meet the required load; And A fuel control valve for controlling the fuel flow required during idle driving of a diesel vehicle, characterized in that it comprises a top speed adjustment screw for fixing the fuel injected at the maximum speed at the bottom.