KR19980055462A - Air shutoff device for fuel supply system of car - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air shutoff device for a fuel supply system of an automobile, and includes an on / off solenoid valve installed between an air cleaner and an air distribution pipe of a fuel supply system, and an engine rotation by controlling driving of the solenoid valve. When it is judged that it is idle operation by receiving input signals from water sensor, throttle position sensor and cooling water temperature sensor, it is equipped with an electronic control unit that sends 'off' signal of solenoid valve. It is composed. The air shutoff device of the fuel supply system of a vehicle according to the present invention, the electronic control unit is the 'off' signal of the solenoid valve in the region determined to be idle operation by the rotation speed sensor, the throttle position sensor and the cooling water temperature sensor, etc. Since the air is not supplied to the injector during idle operation, the instability of idle operation caused by excessive air supply during idle operation can be solved as in the prior art, and the exhaust gas can be reduced due to the stability of idle operation. .

Description

Air shutoff device for fuel supply system of car

1 is a schematic diagram of a conventional general vehicle fuel system.

FIG. 2 is a detailed view showing main parts of the fuel system shown in FIG.

3 is a schematic diagram of a fuel system for a vehicle employing an air supply shutoff device for idle driving of the present invention.

* Description of the symbols for the main parts of the drawings *

1: Air Cleaner 2: Air Distribution Pipe

10: solenoid valve 20: electronic control unit

[TECHNICAL FIELD OF THE INVENTION]

The present invention relates to a fuel supply system of an automobile, and more particularly, to an air shutoff apparatus of a fuel supply system of an automobile that blocks supply of air during idle driving.

[Private Technology]

As shown in FIGS. 1 and 2, a general vehicle fuel system includes an air distribution pipe 2 for distributing air flowing through the air cleaner 1 to each cylinder, and an external fuel tank ( A fuel distribution pipe 3 for dispensing fuel supplied from each fuel cylinder to each cylinder, and a fluid in an air + air state distributed and supplied from the air distribution pipe 2 and the fuel distribution pipe 3; Several injectors 4 (equal to the cylinders) for injecting into each cylinder are provided.

As shown in FIG. 2, the injector 4 is connected to the fuel distribution pipe 3 via an O-ring 5, the other end of which is an O-ring to the intake manifold 6. (7) is connected under the air, the air port (4a) and the air distribution pipe (2) provided on one side is connected by the connecting tube (8) and the air supplied from each distribution pipe (2) (3) and The fuel is injected into the cylinders, and the fluid is supplied from the electronic control unit 9 to the respective cylinders to inject the fluid in the fuel + air state. The air supply to the cylinder is to reduce the harmful gas components such as CO and HC generated during combustion.

[Technical problem to be achieved]

However, in the fuel supply system of a general vehicle as described above, it is necessary to cut off the air supply depending on the mode, for example, during idle driving, but it is not possible to supply the appropriate air separately and start the engine immediately after starting the engine. By supplying air + fuel fluid in all areas of the 'off', there is a problem that causes instability of idle operation, such as an engine rumble due to excessive air supply during idle operation.

The present invention has been made in view of the above, and provides an air shutoff device for a fuel supply system of a vehicle capable of eliminating instability of idle driving due to excessive air supply by cutting off the air supply during idle driving. There is a purpose.

[Configuration and Function of Invention]

An air shutoff device for a fuel supply system for an automobile according to the present invention for achieving the above object includes an on / off solenoid valve provided between an air cleaner and an air distribution pipe of a fuel supply system, and a drive of the solenoid valve. If the controller determines that the motor is idle, it receives an input from the engine speed sensor, the throttle position sensor, and the coolant temperature sensor, and sends an 'off' signal to the solenoid valve. Characterized in that the air is not supplied to the injector side.

The air shutoff device of the fuel supply system of a vehicle according to the present invention, the electronic control unit is the 'off' signal of the solenoid valve in the region determined to be idle operation by the rotation speed sensor, the throttle position sensor and the cooling water temperature sensor, etc. Since the air is not supplied to the injector during idle operation, the instability of idle operation due to excessive air supply during idle operation can be solved as in the prior art, and the exhaust gas can be reduced due to the stability of idle operation. .

EXAMPLE

Hereinafter, with reference to the accompanying drawings, an air shutoff device for a fuel supply system for a vehicle according to the present invention as described above.

FIG. 3 is a schematic diagram of a vehicle fuel system employing an air supply shutoff device for idle driving of the present invention.

As shown, the air shutoff device of the fuel supply system of an automobile according to the present invention is a solenoid valve 10 for 'on / off' installed between the air cleaner 1 and the air distribution pipe 2 of the fuel supply system. And an electronic control unit 20 for controlling the drive of the solenoid valve 10.

The solenoid valve 10 selectively opens and closes the air supply path while driving on / off according to a signal applied from the outside so that the air supplied through the air cleaner 1 flows into the air distribution pipe 2. Selectively block

The electronic control unit 20 drives the solenoid valve 10 'on / off', thereby dividing the operation mode into an idle operation mode and other operation modes to 'off' the solenoid valve 10 during idle operation. Control to block the air inlet. At this time, the electronic control unit 20 receives a signal input from each sensor, for example, the engine rotation sensor, the throttle position sensor, and the coolant temperature sensor, and transmits the closing signal of the solenoid valve when it is determined that the vehicle is idle.

In addition to the other parts constituting the configuration of the present invention, the general configuration constituting the fuel supply system is the same as the conventional case is given the same reference numerals and redundant description is omitted here.

The apparatus of the present invention as described above, when the idle driving mode while driving the vehicle, such an idle signal is input to the electronic control unit 20 through a plurality of sensors, if it is determined that the idle driving mode, the solenoid valve ' Signal to 'off'. As a result of the signal of the electronic control unit, the air inflow path that is opened is closed, and the air supply to the air distribution pipe is blocked. Therefore, air is not supplied to the injector during idle operation.

[Effects of the Invention]

As described above, the air shutoff device of the fuel supply system of an automobile according to the present invention includes a solenoid valve in a region where the electronic control unit is judged to be idle by the rotation speed sensor, the throttle position sensor, the coolant temperature sensor, and the like. Since the air signal is not supplied to the injector during idling operation, the instability of idle operation due to excessive air supply during idle operation can be solved as in the prior art, and reduction of exhaust gas due to stabilization of idle operation can be achieved. We can plan. The effects of the present invention as described above are doubled, especially in a small engine with a small amount of required air during idling.

In the above, one embodiment for implementing an air shutoff device for a fuel supply system of an automobile according to the present invention has been illustrated and described, but the present invention is not limited to the above-described embodiment, but the present invention claims in the following claims. Various changes can be made by those skilled in the art without departing from the gist of the invention.

Claims (1)

On / off solenoid valve installed between the air cleaner of the fuel supply system and the air distribution pipe, and the signal input from the engine speed sensor, the throttle position sensor and the coolant temperature sensor by controlling the operation of the solenoid valve The air shutoff device of the fuel supply system of the vehicle, characterized in that the electronic control unit for transmitting the 'off' signal of the solenoid valve when it is determined that the idle operation, so that no air is supplied to the injector side during the idle operation.