JPS6060244A - Apparatus for correcting fuel discharge rate in engine with supercharger - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a fuel discharge amount correction device for an engine including a carburetor in an intake passage and a supercharger located upstream of the carburetor.

Conventionally, as this type of device, an introduction passage for introducing the supercharging pressure generated in the supercharger is provided in the float chamber of the carburetor, and the pressure in the float chamber is balanced with the pressure on the upstream side of the venturi section of the carburetor. In this way, a pressure difference is generated between the float chamber and the venturi section according to the air flow flowing through the venturi section, and a predetermined amount of fuel is discharged into the venturi section according to the air flow rate. Although such a formula is known, in this case, there is a need to correct the discharge amount as necessary. That is, for example, at high altitudes, the air becomes leaner and the intake mixture tends to be on the rich side, so there is a need to correct the fuel discharge amount to the lower side, or even further, in normal settings, the throttle valve schedule Above the opening, the intake air-fuel mixture tends to be more or less on the lean side, and thus there is a need to correct the fuel discharge amount t to the increasing side.

The object of the present invention is to provide a device that satisfactorily meets these requirements. In a type equipped with an introduction passage for introducing pressure into the float chamber of the carburetor, the upstream end of the introduction passage is arranged at different positions on the outer circumference of the scroll constituting the supercharger. It is selectively connected to at least two supercharging pressure outlet ports.

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

Figure 1 shows one example, where (1) is the engine, (
2) shows the intake passage, and (3) shows the exhaust passage. In the intake passage +2J, there is a variable venturi type carburetor (4), and a variable venturi type carburetor (4) is located upstream thereof and intervenes in the exhaust passage (3). and a supercharger (6) consisting of a compressor driven by a turbine (5).
The 4-4 chamber (7) is provided with an introduction passage (8) for introducing the supercharging pressure of the supercharger (6). +9+ Vi In the drawing, a surge tank (4a) (4) located between the carburetor +41 and the supercharger (6) and interposed in the intake passage (2)
b) is the venturi part and fuel discharge port in the carburetor (4), and b) is the air cleaner at the upstream end of the intake passage (2);
aυ indicates the throttle valve on the downstream side thereof.

Although the above is not particularly different from the conventional system described above, according to the present invention, the outer circumference of the scroll constituting the supercharger (6) (supercharging pressure outlet (At least two 12+ were arranged, and the upstream end of the introduction passage (8) described above was selectively connected to them.

To explain further, the scroll (6a) has a spiral shape as a whole, as clearly shown in FIGS. Plan on points a% b % c %d-be, ci,
Considering the case where each supercharging pressure intake port α force is opened, the supercharging pressure obtained is, for example, shown in Fig. 4 by lines A, B,
As shown in O1D and E, for example, in the case of high altitude correction 1
The upstream end of the introduction passage (8) described above is connected to the supercharging air intake port (+2i) at each of the points a% b % Os d N θ as indicated separately by appropriately bending it. The intake port (12+) at point 0 was bent and the introduction passageway (8) was connected to it, but this resulted in an effect on the inside of the float chamber (7) compared to the case where point 81 was bent. The supercharging pressure to be generated is low, and the fuel discharge amount is corrected to the decreasing side.In other words, the intake air-fuel mixture is corrected to the lean side.

FIG. 4 shows another example of the present invention. In this case, the fuel discharge amount is corrected to increase when the opening degree of the throttle valve aυ is exceeded. To explain this further, the throttle sensor (1) detects the opening degree of the throttle valve Qll.
The output voltage of 31 is compared with the reference opening setting voltage obtained from the setting device 9 by the comparator Q, and when the opening of the valve αυ is greater than or equal to the predetermined opening, a voice power signal is obtained by the comparator 05). The output signal is guided to the operating solenoid (16a) of the switching valve so that the valve (161) is switched and operated, so that at least two of the above-mentioned supercharging air intake ports a'; is switched and connected to the upstream end of the introduction passage (8) described above.◇The two outlet ports 0 are, for example, two points, point C and point e, and according to the above switching, point C It is assumed that the side, that is, the side where the boost pressure is higher, is bent, and the fuel discharge amount is increased, and therefore the intake air-fuel mixture is corrected to the rich side.

In this way, according to the present invention, at least two supercharging pressure outlets are planned at different positions on the outer circumference of the supercharger, and these are bent as appropriate. It is connected to the upstream end of the introduction passage, and it is possible to freely obtain different supercharging pressures in the float chamber of the carburetor, and the fuel t (discharge h
1 correction can be easily and reliably performed, and it has the effect of being freely applied to, for example, G-spot correction, etc.

[Brief explanation of drawings]

Fig. 1 is an explanatory diagram of one example of the device of the present invention, Fig. 2 is a historical drawing of the scroll of the supercharger, and Fig. 3 is its III-II.
I-line cut rtit diagram, FIG. 4 is a 119 culm diagram showing changes in supercharging pressure corresponding to the position of the supercharging pressure outlet, and FIG. 5 is an explanatory diagram of another example of the uninvented device 1. (11... Engine (2+... Intake passage (4)... Carburetor (6)... Supercharger (7)... ...Flow F'7 (8)...
...Introduction passage (6a)...Scroll az...
・・2 people outside the boost pressure outlet

Claims (1)

[Claims] In an engine equipped with a supercharger on the upstream side of the carburetor in the intake passage of the engine, and an introduction passage for guiding the supercharging pressure of the supercharger into the float chamber of the carburetor, the upstream end of the introduction passage is selectively connected to at least two supercharging pressure outlets disposed at different positions on the outer scroll constituting the supercharger, in a supercharged engine. Discharge correction device.