JPS5882041A - Acceleration fuel feeding system for engine - Google Patents

Abstract

PURPOSE:To increase the fuel supply rate to meet with the rate of acceleration without causing delay of time, by dividing the range of the opening angle of a throttle valve into a plurality of sections, and detecting the time required for the throttle valve to pass through one of said sections each time the throttle valve passes through the next section. CONSTITUTION:A control plate 33 of a throttle-valve opening detector 32 is fixed to a throttle valve, and four solts l1-l4, two slots m1, m2 and one slot n1 are formed respectively along three concentric circles L, M, N around the axis of the throttle valve. A light source 34 and a photo-transistor 35 are disposed on the opposite sides of the control plate 33. When the opening of the throttle valve is increased slightly from that of the idling operation and it comes to a section AB, light is transmitted through three slots l1, m1, n1 and a prescribed amount of acceleration fuel is supplied. Similarly, each time it passes through the sections along with increasing of the opening of the throttle valve, the time required for passing through each section is detected from the time when light is transmitted therethrough, and the amount of fuel to be supplied is increased to meet with the rate of acceleration.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention detects the opening operation of a throttle valve or a change in intake pressure to determine acceleration operation when performing air-fuel ratio control using a fuel injection device or a carburetor. The signal is normally input to the control circuit, and the opening operation of the nine throttle valves is generally detected. - Conventionally, the opening speed of the throttle valve was detected by converting it into a continuous change in electrical quantity, and the control circuit then performed analog-to-digital conversion processing to supply accelerating fuel according to the opening speed. Therefore, a nine-hour delay was unavoidable, resulting in poor responsiveness.

In particular, a common problem was that there was a noticeable delay in the start of acceleration fuel at the start of acceleration.

The present invention divides the required opening angle range of the throttle valve into several sections, and detects the time required for the throttle valve to pass through each section every time the throttle valve passes through the next section. By repeatedly supplying accelerating fuel according to the degree of acceleration, and further supplying constant accelerating fuel when the throttle valve opens slightly wider than the idling opening, and after opening more than that, the above operation is performed. The purpose of this book is to provide an acceleration fuel supply method that does not involve the problems mentioned above.

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows a fuel injection system, in which an electromagnetic injection valve 4 is installed upstream of a throttle valve 3 in an intake path 2 connected to an engine 1, and fuel in a tank 5 is pressurized by a pump 6. It is injected from the lower injection valve of the injection valve 4.

FIG. 2 shows a carburetor, in which fuel in a constant oil level chamber 11 is sent through a fuel passage 13 having an electromagnetic control valve U to a nozzle 16 opened in a bench fitting 15 of an intake passage 14. Accelerating fuel is sent to an accelerating nozzle 19 by an accelerating pump 18 mechanically interlocked with a throttle valve 17 .

FIG. 3 shows the same carburetor, in which the fuel in the constant oil level chamber is sent through the fuel passage 2 having an electromagnetic control valve n to the nozzle I opened at the pente a925 of the intake passage. An electromagnetic control valve 4 opens and closes a control nozzle branching from the passageway and opening downstream of the throttle valve 4 to control the accelerating fuel.

Injection valve 4 and pump 6 in FIG. 1, control valve U in FIG. 2,
The two control valves n and 29 in FIG. 3 are electronic control circuits 31
It is driven by the output signal from the throttle valve 3. L7.
Z1 opening detection 1) In addition to 32.

Exhaust composition, engine temperature, engine speed.

Signals emitted by several detectors of elements such as fuel temperature, intake air temperature, intermittent intake air amount, engine intake negative pressure, and atmospheric pressure are given to the control circuit 31 as cooling power signals, and information regarding the engine operating status is sent to the control circuit 31. The control circuit 31 issues an output signal to provide an appropriate air-fuel ratio according to the engine temperature, and the acceleration fuel is also modified depending on the engine temperature.

In FIG. 1, normal fuel plus acceleration fuel is injected from the injection valve 4, and in FIG. 2, the main fuel amount by the control valve ν is increased to correct the acceleration fuel from the acceleration pump 18. In Figure 3, accelerating fuel is supplied downstream of the throttle valve via control valve 4.

Figures 4 and 5 show an example of the opening detector section.

The diaphragm 9 is fixed to the valve shaft and rotates together with the throttle valve 3.17.27, and the light source and phototransistor are placed facing each other with the board 9 in between. 3.17.27 Required valve opening angle range 9 For example, 35 to 55 degrees El from the opening position slightly larger than idling once
A hole is provided in the range where the light from the light source U passes.

That is.

In the illustrated embodiment, there are three concentric circles centered on the throttle valve axis;
Divide M and N into seven sections of precise length each by rays A, B, C, D, B, F, G, and H at equal angular intervals centered on the throttle valve axis, and divide each concentric circle into seven sections. , M, along N are sections m, BC,...
A groove-shaped hole is provided in the substrate 33 at a predetermined location on the surface. Four holes along the outer third circle 11.1.
, 1. , 14. Two holes fi along the middle second circle M
,, fFL,, one hole town along the inner third circle N has passed through each section and entered the next section! The number of light beams received by the phototransistor 3s is arranged differently.

Throttle valve 3. At t7.27, when the vehicle starts passing through a town after the idle link, the first input signal is given to the control circuit 31 and a certain amount of acceleration fuel is supplied. When the light enters the second section i and passes through the two holes WLl and Wl, no acceleration fuel is supplied even if an input signal is issued, and it exits the second section and enters the third section j CD. The light passes through the two holes 'R+1 & 1 and emits an input signal, and the two compartments.

Acceleration fuel is supplied according to the time required to pass BC. In this way, the time required each time the light passes through two sections can be immediately determined by the time it takes for the light to pass through, so the opening speed of the throttle valve can be easily determined in accordance with the degree of acceleration. Accelerating fuel will be supplied, and each time the vehicle passes through one primary section, the operation of detecting the time required to pass through the previous two sections is repeated.

After passing through the last section jGH, all the light beams are blocked, and at this time, an input signal is emitted to the two sections FG.

Accelerating fuel is supplied in accordance with the time required to pass the tsukuda, but there is no problem even if the accelerating fuel is not supplied at this point.

Note that when increasing the number of sections, the number of concentric circles is increased to increase the number of holes so that the light patterns do not overlap. Alternatively, the control circuit 31 may be configured to issue an output signal for supplying acceleration fuel every time the vehicle passes through three or more sections. Even more opening detector! consists of a variable resistor like a potentiometer.

The resistance value may be changed stepwise each time the object passes through a plurality of sections, and the time required to pass through the sections may be detected. Yet again. As described above, the present invention divides the required opening angle range of the throttle valve into a number of sections, and The operation of detecting the time required for the throttle valve to pass through a plurality of sections is repeated each time the throttle valve passes through the next section, and an output signal for accelerating fuel supply is generated from the control circuit. Therefore, even if the throttle valve swings while the engine is running at a constant speed, unless the throttle valve moves over two sections or more, it will not detect accelerating operation, which eliminates the inconvenience of issuing a false signal. This improves operational stability by keeping the air-fuel ratio constant at times, and also eliminates wasteful control operations in which the accelerated fuel supply must be corrected using an input signal from an exhaust composition detector or the like. In addition, since the time required for the throttle valve to rotate through the desired angle is detected every time it is accelerated, the processing within the control circuit is extremely simple, and the appropriate amount of rotation can be achieved without a delay of one hour. It can supply acceleration fuel.

Furthermore, in the present invention, it is determined that acceleration has started when the throttle valve 9 opens a little wide (as compared to the idling opening), and a constant acceleration fuel is supplied. This has the effect of eliminating fuel lag and making driving more refreshing.

[Brief explanation of the drawing]

Figures 1, 2, and 3 are schematic vertical cross-sectional views showing different examples of fuel supply devices, Figure 4 is a front view of an example of an opening detector, and Figure 5 is a diagram taken along line X-X in Figure 4. The sectional view shown in FIG. 6 is a diagram for explaining the state of acceleration, the generation of input signals associated therewith, and the state of supply of acceleration fuel. 2, 14.24... Intake path, 3, 17.27.
... Throttle valve, 4... Injection valve, 7.16...
・Nozzle port, 12, 29-... control valve. Device: Accelerating nozzle, 31: Control circuit, 32: Opening degree detector. Agent Mutsuaki Nozawa Figure 1 Figure 5 corner 3 houses

Claims (1)

[Claims] (1) In the acceleration fuel supply method in which the throttle valve opening operation is input to the control circuit and an output signal for accelerated fuel supply is issued from the control circuit, the required valve opening angle range of the nine throttle valves is divided into several sections. , the operation of detecting the time required for the throttle valve to pass through a plurality of sections is repeated each time the throttle valve passes through the next section, and an output signal for accelerating fuel supply corresponding to the degree of acceleration is generated. In the acceleration fuel supply system, an output signal for supplying a certain amount of acceleration fuel is emitted from the control circuit when the throttle or valve is opened slightly wider than when idling. The throttle valve detects the time required for the throttle valve to pass through the plurality of divisions. An acceleration fuel supply system for an engine, characterized in that a control circuit repeatedly issues an output signal for supplying acceleration fuel according to the degree of acceleration each time the engine passes through a section of a garden.