KR19980078512A - Restart compensator in case of vapor lock of electronically controlled fuel injection engine - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a restart compensator when a vapor lock occurs in an electronically controlled fuel injection engine, and includes a fuel pump (11) for discharging fuel from an automobile fuel tank (T) and a fuel filter (12) for removing impurities of such fuel. And a pulsation damper 13 that reduces fuel pressure pulsation and noise in the fuel line that occurs when the injector injects fuel and makes the flow of fuel constant, an injector 14 that injects fuel, and a fuel pressure to adjust the fuel pressure. In the fuel supply system of the electronically controlled fuel injection engine composed of a regulator (15) or the like, a fuel temperature sensor (21) for detecting the temperature of the fuel is provided between the pulsation damper (13) and the injector (14). A fuel pressure increaser between the injector 14 and the fuel pressure regulator 15 raises the pressure of the fuel sensed in the return line of the fuel to a pressure set in advance in the ECU. (22) is provided so as to increase the fuel pressure when the temperature is higher than the predetermined temperature by vapor lock, and to inject the fuel by the set fuel increase to smoothly start up during hot restart.

Description

Restart compensator in case of vapor lock of electronically controlled fuel injection engine

The present invention is to improve the difficulty of restarting the engine by the vapor lock (Vapor Lock) generated by the high temperature of the fuel in the vicinity of the injector in the electronic fuel injection (EGI) engine, in advance when the fuel temperature is above a certain temperature The present invention relates to a restart compensator in the event of a vapor lock of an electronically controlled fuel injection engine which seeks to obtain smooth startability from a condition that is excessively thinned by the vapor lock by allowing the fuel to rise at a predetermined fuel pressure and allowing fuel to be injected at a predetermined fuel increase.

In general, Electronic Gasoline Injection (EGI), also called EFI (Electronic Gasoline Injection), is used to atomize the fuel inhaled by the engine to inject fuel under the action of computer control. . This is performed based on many data such as intake air amount, intake air temperature, throttle opening, water temperature, engine speed, and oxygen concentration in the exhaust gas.The most suitable fuel is supplied according to the driving conditions, and thus fuel consumption, exhaust gas purification, etc. This is an advantage.

FIG. 3 is a view illustrating a conventional fuel system in the electronically controlled fuel injection device. The fuel flow is blocked by component parts.

This passes through the fuel filter 12 which filters impurities of the fuel discharged from the fuel pump 11 of the fuel tank T, and subsequently reduces fuel pressure pulsation and noise in the fuel line that occurs when the injector injects fuel. Fuel pressure, which is a valve connected to the injector 14 via a pulsation damper (13; fuel pulsation damper) that maintains a constant flow of fuel, and adjusts the fuel pressure so that the fuel pressure is constantly operated with respect to the atmospheric pressure or the intake manifold. It is connected to the fuel tank (T) so that the fuel is returned through the regulator (15; Fuel Pressure Regulator).

In such a conventional configuration, the fuel system fuel pressure from the fuel pump to the injector mounted on the intake manifold of the engine is set to about 2.55 (kgf / cm 2) to suppress the generation of vapor.

However, if the fuel temperature near the injector exceeds 100 ° C after a short time after stopping the engine while driving on the road or driving at a low speed in the summer, when the valve of the injector is opened by cranking of the restart, this valve is near the valve. The fuel pressure of the gas is momentarily approaching the atmospheric pressure, and at that moment, the vapor is generated violently, and the gasoline in the injector is vaporized. This results in a Vapor Lock phenomenon that causes the system to lose function.

And if this phenomenon persists, the amount of fuel measured by the opening and closing time of the injector is reduced to the extreme, and thus a problem occurs that the engine is not started well even if the cranking continues.

Accordingly, the present invention has been made in view of the above-described problems, and an object of the present invention is to provide a restart compensator in the event of a vapor lock of an electronically controlled fuel injection engine to improve the difficulty of restarting the engine caused by a vapor lock in summer. There is.

1 is a block diagram showing the configuration of the present invention;

2 is a flowchart in accordance with the operation of the present invention,

3 is a block diagram showing a fuel supply structure of a conventional engine.

(Explanation of symbols for the main parts of the drawing)

11; Fuel pump 12; Fuel filter

13; Pulsation dampers 14; Injector

15; Fuel pressure regulator 21; Fuel temperature sensor

22; Fuel pressure riser T; Fuel tank

E; engine

In order to achieve the above object, the present invention provides a fuel pump 11 for discharging fuel from an automobile fuel tank T and a fuel filter 12 for removing impurities from such fuel, and fuel generated when an injector injects fuel. Electronically controlled fuel consisting of a pulsation damper 13 for reducing fuel pressure pulsation and noise in the line and keeping the flow of fuel constant, an injector 14 for injecting fuel, and a fuel pressure regulator 15 for adjusting fuel pressure. In the fuel supply system of the injection engine,

A fuel temperature sensor 21 is installed at a predetermined portion between the pulsation damper 13 and the injector 14 and a fuel return sensor is provided between the injector 14 and the fuel pressure regulator 15. Install a fuel pressure riser 22 which raises the pressure of the detected fuel to a pressure previously set in the ECU, and raises the fuel pressure when the temperature exceeds the predetermined temperature by vapor lock, and injects the fuel by the set fuel increase to restart hot. A restart compensator is provided when a vapor lock occurs in an electronically controlled fuel injection engine, which is configured to smoothly start a city.

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

FIG. 1 is a block diagram showing the configuration of the present invention, in which a fuel temperature sensor 21 is installed at a predetermined portion between a pulsation damper 13 and an injector 14.

A fuel pressure riser 22 is installed between the injector 14 and the fuel pressure regulator 15 to raise the pressure of the current fuel to the set pressure in the return line of the fuel.

The fuel temperature sensor 21 is connected to the ECU so that the measured temperature value is input, and the fuel pressure riser 22 is configured to be controlled and operated by the ECU.

The operation of the present invention configured as described above will be described with reference to the flowcharts of FIGS. 1 and 2.

First, it detects that the vehicle is in a starting state and, if starting, senses the temperature of the fuel currently supplied to the injector 14 from the fuel temperature sensor 21. At this time, the detected fuel temperature data is input to the ECU (not shown), and if the detected temperature is higher than a predetermined temperature (100 ° C.), the ECU increases to the preset fuel pressure through the fuel pressure riser 22 according to the fuel temperature. Let's do it. And when the detected fuel temperature is less than 100 ℃ normal fuel pressure is kept constant.

As a result, the fuel injection is performed in the injector 14 by the set fuel increase, thereby improving the lean condition by the vapor lock to smoothly start the engine. At this time, the ECU determines whether the start has been performed and, if it does not start, controls to perform the operation of raising the fuel pressure again according to the fuel temperature. When the start is completed, the operation of the fuel pressure riser 22 is stopped to return the fuel pressure to the normal pressure and to perform normal ECU control.

As described above, the present invention detects when restart is difficult due to the vapor lock generated by the fuel temperature increase near the injector in the electronic control engine, and increases the fuel pressure so that the engine can be started automatically. Since the injection is made in the injector by improving the state, the startability of the engine is improved smoothly during the hot restart, and thus the restarting reliability of the summer engine is increased. As a result, the effect of improving the quality of the vehicle is generated and the quality reliability and the merchandise are improved.

Claims (1)

Reduction of fuel pressure pulsation and noise in the fuel line generated when the fuel pump 11 for discharging the fuel of the vehicle fuel tank T and the fuel filter 12 and the injector for removing impurities of such fuel are injected. In the fuel supply system of an electronically controlled fuel injection engine comprising a pulsation damper (13) for injecting fuel and a constant flow of fuel, an injector (14) for injecting fuel, and a fuel pressure regulator (15) for adjusting fuel pressure, A fuel temperature sensor 21 is installed at a predetermined portion between the pulsation damper 13 and the injector 14 and a fuel return sensor is provided between the injector 14 and the fuel pressure regulator 15. Install a fuel pressure riser 22 which raises the pressure of the detected fuel to a pressure previously set in the ECU, and raises the fuel pressure when the temperature exceeds the predetermined temperature by vapor lock, and injects the fuel by the set fuel increase to restart hot. Restart complementary device upon occurrence of vapor lock of the electronically controlled fuel injection engine, characterized in that it is configured to smooth start.