JPS6198961A - Starting fuel device of internal-combustion engine - Google Patents

Abstract

PURPOSE:To promote fuel to be atomized into a fine particle and improve low temperature startability of an engine when it is in a low temperature, by providing a passage, which introduces bleed air, in a starting fuel passage of a starting fuel device supplying starting fuel to the downstream of a throttle valve. CONSTITUTION:A device, connecting an air bleed passage 20 with a starting fuel passage 9 on its half way and opening an inlet of the passage 20 to the internal wall of a throttle body 4 in the upstream of a throttle valve 6, enables bleed air to be introduced to the starting fuel passage 9. Now the device, if an engine 1 is started by placing a solenoid operated valve 11, 12 opening and closing the starting fuel passage 9 and a bypass air passage 10 respectively in an open condition, allows starting fuel and bypass air to flow in the both passages 9, 10 being mixed in their confluent point and jetted to the downstream of the throttle valve 6 in an intake passage. Here the device mixing the starting fuel with the bleed air introduced from the air bleed passage 20 and forming the fuel in an emulsion state joining with the bypass air, enables atomization to be promoted.

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to an electronically controlled fuel injection device for internal combustion engines (hereinafter also referred to as engines) of automobiles, etc., and particularly for supplying starting fuel together with main fuel during cold starting. The present invention relates to a starting fuel device that improves starting characteristics.

Conventional technology When starting an automobile gasoline engine that has been left in a low-temperature state for a long time, the fuel vaporizes and the combustion of the air-fuel mixture is poor. I have to. In other words, fuel injection OA
In the case of an engine equipped with a device, as shown in FIG. In addition to supplying the required amount of fuel to the engine 32 by controlling the main fuel injection valve 35, the amount of fuel is increased by a low-temperature starting fuel injection valve 36 that operates only at low temperatures for a period of time depending on the cooling water temperature. The low-temperature starting fuel injection valve 36 starts operating when the starter switch 38 is turned on and current flows through the heat coil of the timer 37, which is made up of a bimetal, a heat coil, and a contact point. Thereafter, the bimetal gradually deforms, and after a period of time corresponding to the temperature of the cold U1 water has elapsed, the initially closed contact point is heard and the low temperature starting fuel injection valve 36 is closed.

Problems to be Solved by the Invention However, the starting fuel system that supplies starting fuel to the engine 32 via the low-temperature starting fuel injection valve 36 is constructed separately from the control circuit 31 of the main fuel injection valve 35. Therefore, although there is a water temperature sensor 33 for engine control to detect the water temperature, there is a separate timer 37 that determines the time depending on the water temperature, which makes the system expensive. The structure is as follows.

Furthermore, the operating time of the timer 37 changes depending on the battery voltage, so if the battery is sufficiently charged, the operating time of the timer 37 will become shorter and the fuel source will be insufficient, and conversely, the battery will be insufficiently charged. If the voltage is low, the timer 37 operates for a long time, resulting in too much fuel, which may cause engine malfunction.

In order to solve these problems, the applicant of the present application, by Utility Application No. 58-201188, stopped using the fuel injection valve for low-temperature starting, and adopted a simpler and more reliable configuration for starting the fuel at low temperatures. Disclosed is a starting fuel device that improves engine starting performance.

This invention applies to an electronically controlled fuel injection device for an internal combustion engine.
The object of the present invention is to provide a starting fuel device that further improves starting performance.

Means for Solving the Problems and Their Effect The present invention provides an electronically controlled steering engine for an internal combustion engine having a starting fuel system that supplies starting fuel downstream of a throttle valve via a starting fuel passage. The starting fuel injection device is characterized in that a passage for introducing bleed air is provided in the starting fuel passage. According to this device, the starting fuel is mixed with bleed air and ejected in the form of an emulsion, which improves atomization and improves engine startability.

EXAMPLES The present invention will be described below based on drawings showing examples. 1 is an engine, 2 is a fuel tank, and 3 is a main fuel passage. 4 is a throttle body, the upstream side of which is connected to an air cleaner (not shown), and the downstream side connected to the intake manifold 5 of the engine 1. A throttle valve 6 is provided at the bottom of the throttle body 4, and an electromagnetic twist injector 7 is installed at the top. Return fuel from the electromagnetic fuel injector 7 is returned to the fuel tank 2 through a return fuel passage 8. A starting fuel passage 9 is branched from the return fuel passage 8, joins the end of the bypass air passage 10, and is led to a downstream position of the throttle valve 6. The inlet of the bypass air passage 10 is opened in the inner wall of the throttle body 4 upstream of the throttle valve 6, bypasses the throttle valve 6 on the way, and the outlet is opened at a position downstream of the throttle valve 6. .

The starting fuel passage 9 and the bypass air passage 1° include
Solenoid valves 11 and 12 are provided to open and close each passage. 13 is a control circuit which inputs signals from sensors 14 and 15 that detect the operating state of the engine and sends control signals to the electromagnetic fuel injector 7 and electromagnetic valve 11 and 12, respectively.16 is a fuel pressure regulator It is provided downstream from the branch point of the return fuel passage 8.

An air bleed passage 20 is located in the middle of the starting fuel passage 9.
are combined. The entrance of the air bleed passage 20 is
An opening is opened in the inner wall of the throttle body 4 upstream of the throttle valve 6, and bleed air is introduced into the starting fuel passage 9. The air bleed passage 20 may be provided with a stopper 21, as shown in FIG. It can also improve emulsification with bleed air.

In the starting fuel system of the electronically controlled fuel injection system configured as described above, when the solenoid valves 11 and 12 are opened to start the engine 1, the starting fuel passage 9 and the bypass air passage 1o are connected to each other. Starting fuel and bypass
Air flows, mixes at the confluence point, and is ejected downstream of the throttle valve 6 in the intake passage. At this time, the starting fuel is mixed with the bleed air introduced from the air bleed passage 20, becomes an emulsion, and is merged with the bypass air, resulting in very good atomization in the intake passage and starting the engine. Improve your sexuality.

Effects of the Invention As explained above, the present invention introduces bleed air into the starting fuel passage in a starting fuel system provided in place of a low-temperature starting fuel injection valve in an electronically controlled fuel injection system of an engine. By creating a passageway for
The atomization of the atomized fuel at low temperatures is further improved, which has the effect of further improving the low-temperature startability of the engine.

[Brief explanation of the drawing]

The figures show an embodiment of the invention, and FIG. 1 is a vertical sectional view of the main part;
FIG. 2 is an enlarged view of main parts of another embodiment, FIG. 3 is a partially cutaway overall configuration diagram, and FIG. 4 is an overall configuration diagram of a conventional electronically controlled fuel injection device. 6...Throttle valve 7...Electromagnetic fuel injection valve 9...Starting fuel passage 10...Bypass air passage 20...Air bleed passage Applicant Aisan Kogyo Co., Ltd. Agent Person Patent Attorney Oka 1) Hidehiko
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Claims (1)

[Claims] In an electronically controlled fuel injection device for an internal combustion engine having a starting fuel device that supplies starting fuel downstream of a throttle valve via a starting fuel passage, a passage for introducing bleed air into the starting fuel passage. A starting fuel device characterized by being provided with.