JPS59147855A - Fuel feeder for engine - Google Patents

Abstract

PURPOSE:To permit the correct operation of a swirl flow meter by arranging a fuel injection valve on the upstream side of a swirl flow meter for inhaled air and cleaning the surface of the heating wire of the swirl flow meter by the fuel jetted-out from the fuel injection valve, thus preventing the adhesion of dusts onto the heating wire. CONSTITUTION:When an engine 1 starts operation, air is introduced from an air introducing port 13 and passes through an air cleaner 12, and after the amount of inhaled air is detected by a swirl flow meter 4, the air is introduced into an engine 1 from an intake pipe 2. At this time, the amount of inhaled air is detected by detecting the number of formation of Karman vortex 8 by a heating wire 7. While, the fuel in accordance with each output signal of the swirl flow meter 4 and an inhaled-air temperature detector 10 is jetted-out from a fuel injection valve 9 by an electronic controller 11. Then, the fuel is atomized and mixed with the inhaled air and introduced into the engine 1. Since the fuel passes through the swirl flow meter 4, a portion of fuel particles collide with the heating wire 7 and cleans the surface of the wire.

Description

[Detailed Description of the Invention] The present invention relates to a fuel supply device for an internal combustion engine for automobiles/vehicles,
In particular, can moisture and S dust contained in the intake air of an engine detect all of the Karman vortex formations? This invention relates to a fuel supply system for an engine that completely prevents the detection of Karman vortices from becoming unstable.

As is generally known, in a vortex flowmeter that uses a thin hot wire to detect the number of high-wavelength Karman vortices generated on the downstream side of a vortex generator, if moisture, dust, etc. adhere to the hot wire, the The ability to detect Karman vortices is significantly reduced. Detection of high-frequency Karman vortices becomes unstable. Particularly when such a vortex flowmeter is used to detect the intake air amount of an automobile engine, a large amount of dust and the like in the intake air adheres to the hot wire. This invention disposes a fuel injection valve for supplying fuel to the engine upstream of the vortex flowmeter in order to prevent dust in the intake air of the engine from adhering to the SII line. The purpose is to constantly clean the surface of the hot wire with the fuel injected from the fuel injection valve.

An embodiment of the present invention shown in the drawings will be described below.

In the figure, 11+ is the engine, (1 intake pipe of the 21 engines fi+, (3) is the throttle valve, and (4) is the intake air installed in the intake air passage of the engine (1) and drawn into the engine +11. (6) is a rectifier for rectifying the intake air introduced into the flow meter (14);
) is the (1 medium generator), (7) is a thermal corpse for detecting the number of Karman vortices (8) generated downstream of the vortex generator (6), and (9) is the vortex flow meter ( (4) is a fuel injection valve disposed upstream of (10) is an intake air temperature sensor, tl
l) t/i'' Corresponding to the number of generated Karman vortices (8) detected by the second heat line (7), the amount of fuel corrected according to the output signal of the intake air temperature detector (10) is calculated as above. Injection valve electronic control device for supplying injection from the fuel injection valve (9), +121 is an air cleaner, 031 is air, and d inlet.

I would like to congratulate you on the operation of the device configured as described above.

When the engine Ill is started without being changed, the intake air is introduced from the air inlet port +13, passes through the air cleaner 1121, enters the Uzuura meter 14), and the amount of intake air is detected by the vortex flow meter (4). Four people are transferred to the engine +11 from the intake pipe (2). It is well known that the above-mentioned amount of air can be detected by detecting the total number of Karman vortices (8) generated by the hot rays (7). - 10,000, the above-mentioned vortex flow corresponding to the number of generation of the above-mentioned Karman 1 is a total of 141 outputs, and 1. The injection valve' electronic control device (11) inputting the output signal of the intake air temperature sensor (10) is the above-mentioned Fuel corresponding to the input signal is injected and supplied from the fuel injection valve (9). The fuel injected from the fuel injection valve (9) is atomized and mixed with the intake air, and is introduced into the vortex flowmeter (41) through the intake pipe (2) to the 1st section +11. When the atomized fuel passes through the vortex flow meter 14), some of the atomized fuel particles collide with the hot wire (7) and the surface of the hot wire (7) is cleaned by the fuel. have the effect of

Therefore, the moisture contained in the above-mentioned inhaled air.

This makes it possible to prevent dust and the like from adhering to the heating wire (7).

As described above, according to the present invention, a vortex generator disposed in one intake air passage of an engine, a hot wire for detecting the number of Karman vortices generated on the downstream side of the vortex generator, and the Karman vortex a vortex flowmeter for detecting the amount of intake air taken into the engine from the number of vortices generated; and a fuel injection valve for supplying fuel to the engine in accordance with an output signal of the vortex flowmeter; is placed upstream of the vortex flowmeter, and the heated/frozen surface is cleaned by the fuel injected from the fuel injection valve, so that dust and the like will not adhere to the heated wire, and the above-mentioned This has the effect of stably detecting Karman vortices.

As is well known, the vortex flowmeter is a volumetric flowmeter, so it is best to install it upstream of the throttle valve where pressure changes are small, but if it is installed downstream of the throttle valve, the pressure on the downstream side It is essential to detect and correct the output signal of the vortex flowmeter.

[Brief explanation of drawings]

FIG. 1 is a configuration diagram showing an embodiment of the present invention. In the figure, (1) is the engine, (2) is the intake pipe, (3) is the throttle valve, (4) is the vortex flow meter, (6) is the vortex generator, (7)
(9) is the heat wire, (9) is the fuel injection valve, and (121) is the air cleaner. Agent Shin Kuzuno -

Claims (1)

[Claims] A vortex generator disposed in the intake air passage of the engine, and a hot wire for detecting the number of Karman vortices generated on the downstream side of the vortex generator, are provided to detect the number of Karman vortices generated in the above-mentioned Karman width. a vortex flowmeter for detecting the intake air amount; and a fuel injection valve disposed upstream of the vortex flowmeter to supply fuel to the engine in accordance with the output signal of the vortex flowmeter; A fuel supply device for an engine that cleans the surface of the hot wire with fuel injected from an injection valve.