JPS63259127A - Fuel flow regulating and supply device for gasoline injection engine - Google Patents

Abstract

PURPOSE:To accurately regulate the fuel flow with an inexpensive device by forming a regulation control device for controlling fuel flow regulating means in a fuel system leading to a fuel injector, from a vacuum operator, and connecting a vacuum chamber of the vacuum operator to a suction passage portion downstream of a throttle valve. CONSTITUTION:In a gasoline injection engine provided with a throttle valve 9 and a fuel injector 13 in a suction passage 7, the fuel injector 13 is connected to a fuel tank 15 through a fuel system F including fuel flow regulating means A in a fuel supply line 14. The fuel flow regulating means A is controlled by the operation of a regulation control device B to regulate a fuel flow matching an intake air flow. The regulation control device B is formed by a vacuum operator 35 provided above a fuel relief chamber 43 of a pressure regulating valve 40 as the fuel flow regulating means A. A vacuum chamber 35a is separated from the fuel relief chamber 43 by a diaphragm 50. The vacuum chamber 35a is communicated with a suction passage portion 7a downstream of the throttle valve 9. An output portion 37 of the vacuum operator 35 is connected to a regulation input portion 38.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a device for metering and supplying fuel to the intake path of a gasoline injection engine. This technology makes it possible to meter fuel without any equipment.

(Basic structure as a premise) The fuel metering supply device for this type of gasoline injection engine is
Its basic structure is shown in FIG. 1 or 4, for example.

That is, an air cleaner 8 is connected to the combustion chamber 4 of the gasoline injection engine 1 via an intake passage 7, a throttle valve 9 and a fuel injector 13 are provided in the intake passage 7, and the fuel injector 13 is connected via a fuel supply passage 14. is connected to the fuel tank 15 to constitute a fuel system F, the fuel system F is provided with a fuel metering means A, and the fuel metering means A is controlled and operated by a metering control device B. The fuel injector 13 is configured to meter fuel in an amount corresponding to the intake air amount in the intake passage 7 and inject it from the fuel injector 13 into the intake passage 7.

(Prior art) In the above basic structure, the conventional fuel metering supply device has 14
It was configured as shown in the figure.

That is, the fuel metering means A is constituted by a valve opening time control valve 60 attached to the fuel injector 13 and a pressure setting means 61 for keeping the inlet pressure of the control valve 60 constant, and the metering control device B The micro pump unit 62 and the intake air amount detection means 6
3. It is composed of an electronic metering control device consisting of an engine rotation speed detection means 64. Then, the microcomputer 62 receives the intake air amount signal from the intake air amount detection means 63 and the rotation speed signal from the engine rotation speed detection means 64, and adjusts the opening time of the valve opening time control valve 60 using this output signal. , fuel is injected from the fuel injector 13 in an amount commensurate with the amount of intake air.

(Problems to be Solved by the Invention) In the above-mentioned conventional structure, the microcomputer 62 and the intake air amount detection means 63 are expensive, so the cost of the metering control device B increases, which increases the cost of the engine as a whole.

An object of the present invention is to make it possible to implement a metering control device at a low cost, thereby reducing the cost of the entire Ennon.6 (Means for solving the problems) In order to achieve the purpose, in the basic structure, as shown in FIGS. 1 and 12 or 3, for example, the metering control device B is composed of a negative pressure actuator 35. The negative pressure operating chamber 35a is communicated with the intake passage portion 7a downstream of the throttle valve 9, and the operating output section 37 of the negative pressure actuator 35 is operatively connected to the metering input section 38 of the fuel metering means A. This is a characteristic feature.

(for production) The invention works as follows.

During no-load or low-load operation of the engine 1, the throttle valve 9 is moved to the throttle side, reducing the amount of intake air, and
The negative pressure in the intake passage portion 7a on the downstream side of the throttle valve 9 increases, and the negative pressure in the negative pressure working chamber 35a also increases. Along with this, the operation output section 37 of the negative pressure actuator 35 receives 1llll of fuel.
The set pressure or set flow rate of the I quantity means A is lowered, and the fuel pressure or fuel supply amount to the fuel injector 13 is lowered. As a result, the amount of fuel injected from the fuel injector 13 is reduced to an amount commensurate with the reduced amount of intake air.

Contrary to the above, when the engine 1 is operating at a high load, the throttle valve 9 is operated to the open side, the intake air amount increases, and the negative pressure in the intake path portion 7a downstream of the throttle valve 9 decreases. The negative pressure in the negative pressure working chamber 35a decreases. Along with this, the operation output section 37 of the negative pressure actuator 35 increases the set pressure or set flow rate of the fuel metering means A, and the fuel injector 1
Increase the fuel pressure or fuel supply amount to 3. This results in
The amount of fuel injected from the fuel injector 13 is increased by an amount commensurate with the increased amount of intake air.

(Example) Examples of the present invention will be described below with reference to the drawings. FIGS. 1 and 2 show one embodiment thereof.

! ¥S1 In the figure, 1 is a gasoline injection engine, and 2 is the engine body.

A piston 3 is inserted into the engine body 2 so as to be movable up and down, and a combustion chamber 4 is formed above the piston 3.

An air cleaner 8 is connected to the combustion chamber 4 via an intake valve 6 and an intake passage 7, and a throttle valve 9 is connected downstream of the intake passage 7.
will be provided. 10 is an exhaust valve, and 11 is an exhaust path.

The fuel system F of the above engine is configured as follows.

That is, a fuel injector 13 is attached to the intake path 7 on the upstream side of the throttle valve 9, and a fuel tank 15 is connected to the inlet 13a of the injector 13 via a fuel supply path 14. This fuel tank 1
5 is disposed above the engine body 2.

Further, a diaphragm fuel supply pump 16 is interposed in the fuel supply path 14 . This has a working chamber 18 and a pump chamber 19 separated by a diaphragm 17, and the working chamber 18 is communicated with the terminal end of the intake passage 7 via a communicating pipe 20. On the other hand, the pump chamber 19 is communicated with the fuel supply path 14 via a suction valve 16a and a discharge valve 16b. The diaphragm 17 performs a pumping action due to pressure pulsations in the intake passage 7 that occur as the engine operates, and the fuel in the fuel tank 15 is supplied to the fuel injector 13. Note that the fuel supply pump 16 may use pressure pulsations in the crank chamber instead of using pressure pulsations in the intake passage 7 as a driving source.

Further, a flywheel magneto type generator 20 is attached to the engine 1. This generator 20 has a plurality of permanent magnets 22 attached to a flywheel 21 interlockingly connected to a piston 3, and these permanent magnets 22 are connected to a power generator C2 for ignition.
3 and the lamp generating coil 24.

25 is a timing coil. The output circuit 23a of the ignition power generation filter 23 and the output circuit 25a of the timing fill 25 are connected to a spark plug 30 facing the combustion chamber 4 via an ignition circuit 28 and an ignition coil 29. The output circuit 24a of the lamp generating coil 24 is connected to the lighting lamp 31.

The output circuit 23a of the ignition generating coil 23 is connected to the fuel injector 13, and the fuel injector 13 is opened by the output voltage of the ignition generating coil 23.

Note that the output circuit 24a of the power generating filter 24 for the lamp may be connected to the fuel injector 13 (as shown by the dashed line in FIG. 1), and the fuel injector 13 may be opened by the voltage of the power generating filter 24 for the lamp.

A fuel metering means A is provided in the fuel supply path 14 between the fuel injector 13 and the fuel supply pump 16. By controlling and operating the fuel metering means A with the metering control device B, the fuel in the fuel system F is metered in an amount corresponding to the amount of intake air in the intake passage 7 and is injected from the fuel injector 13 into the intake passage 7. let These fuel metering means A and metering control device B will be explained mainly based on FIG. 2.

The fuel metering means A consists of a pressure regulating valve 40, and its valve box 4
A fuel supply chamber 42 and a fuel relief chamber 43 formed in the fuel supply chamber 1 are communicated with each other through a relief hole 44 . The inlet 13a of the fuel injector 13 and the fuel supply path 14 are communicated via the fuel supply chamber 42. Further, the fuel relief chamber 43 is equipped with a valve body 45 that covers the relief hole 44 in an openable and closable manner, and a valve closing spring 47 that presses the valve body 45 toward the valve closing side. The fuel relief chamber 43 is connected to the fuel supply pump 16 via the return pipe 48.
is communicated to the suction side of the

Further, the metering control device B includes a negative pressure actuator 35 provided above the relief chamber 43, and is configured as follows.

The negative pressure actuator 35 has a negative pressure actuation chamber 35a partitioned off from the relief chamber 43 by a diaphragm 5o.

This negative pressure working chamber 35a is equipped with a return spring 51 that presses the diaphragm 5o downward, and a communication pipe 52
It communicates with the intake passage portion 7a downstream of the throttle valve 9 via the throttle valve 9. The intake negative pressure allows the central portion of the diaphragm 50 to be sucked upward against the elastic force of the return spring 51.

Actuation output section 3 provided near the center of the diaphragm 50
7 is the spring base end 47 of the valve closing spring 47 of the pressure regulating valve 40
Made up of a? A large quantity input part 38 is interlocked and connected so that the tension can be adjusted.

When the throttle valve 9 is operated to the throttle side during no-load or low-load operation, the negative intake pressure in the intake passage portion 7a downstream of the throttle valve 9 increases, and the negative pressure in the negative pressure operating chamber 35a also increases. Become. Along with this, the diaphragm 50 is attracted upward, the set length of the valve-closing spring 47 becomes longer, and the valve-opening pressure of the valve body 45 decreases. As a result, the fuel pressure in the fuel supply chamber 42 decreases, and the amount of fuel injected from the fuel injector 13 decreases.

On the contrary, when the throttle valve 9 is operated to the open side during high-load operation, the negative intake pressure in the intake passage portion 7a becomes small, and the negative pressure in the negative pressure working chamber 35a also becomes small. Along with this, the diaphragm 50 is pushed down by the return spring 51, the set length of the valve closing spring 47 is shortened, and the valve opening pressure of the valve body 45 is increased. As a result, the fuel pressure within the fuel supply chamber 42 increases, and the amount of fuel injected from the fuel injector 13 increases.

FIG. 3 shows another embodiment.

In this case, the fuel metering means A consists of a flow control valve 55,
A fuel supply chamber 42 and a fuel relief chamber 43 formed within the valve box 41 communicate with each other through a valve hole 56 . The fuel supply chamber 42 is communicated with the inlet 13a of the fuel injector 13. Further, a needle valve body 57 and a valve shaft 58 for adjusting the opening of the valve hole 56 are inserted into the fuel relief chamber 43 . The fuel relief chamber 43 is connected to the fuel supply pump 1 via the return pipe 48.
6 is connected to the suction side.

Further, in the negative pressure actuator 35, of the upper and lower compartments partitioned by the diaphragm 50, a negative pressure actuation chamber 35a formed on the upper side is communicated with the intake passage portion 7a via the communication pipe 52, and a lower side chamber 35b is communicated to the atmosphere. A return spring 51 is attached to the negative pressure working chamber 35a. Also,
The actuation output section 37 provided near the center of the diaphragm 50 is the metering input section 3 configured by the valve shaft 58 of the flow rate adjusting valve 55.
8.

When the negative pressure in the negative pressure working chamber 35a increases during no-load or low-load operation, the needle valve body 57 rises and the amount returned from the return pipe 48 increases, causing the injection amount from the fuel injector 13 to increase. decrease. On the contrary, when the negative pressure in the negative pressure working chamber 35a decreases during high-load operation, the needle valve body 57 descends and the amount returned from the return pipe 48 decreases, causing the amount of injection from the fuel injector 13 to decrease. increase.

(Effects of the Invention) Since the present invention is configured and operates as described above, even when a mechanical control device is employed, fuel is injected from the fuel injector in an amount commensurate with the amount of intake air.

The above-mentioned mechanical 114 amount control device is composed of a negative pressure actuator which is cheaper than the computer and intake air amount detection means of the electronic metering control device, so the fuel metering and supply device is inexpensive. Along with this, the cost of Ennon as a whole is low.

[Brief explanation of the drawing]

1 to 3 show embodiments of the present invention, and FIGS. 1 and 2 are one embodiment of the present invention. FIG. 1 is an overall system diagram, and FIG. FIG. 3 shows another embodiment, and FIG. 4 is a diagram corresponding to FIG. 1 showing a conventional example, in which the fuel metering means is constructed with a flow regulating valve. 1... Gasoline injection engine, 4... Combustion chamber,
7...Intake x path, 7a...Intake path portion, 8...
Air cleaner, 9...Throttle valve, 13.
...Fuel injector, 14...Fuel supply path, 15
...Fuel tank, 35...Negative pressure actuator, 35a.
... Negative pressure working chamber, 37... Working output section, 38...
Metering input part, 40'...Pressure control valve, 47...Valve closing spring, 47g...Spring base! Part a, 55... Flow rate adjustment, A... Fuel metering means, B... Metering control device, F... Fuel system. Figure 3 55(A) 47 Figure 4

Claims (1)

[Claims] 1. An air cleaner 8 is connected to the combustion chamber 4 of the gasoline injection engine 1 via an intake passage 7, and a throttle valve 9 and a fuel injector 13 are provided in the intake passage 7. The fuel system F is connected to the fuel tank 15 via the fuel supply path 14.
By providing a fuel metering means A in the fuel system F and controlling and operating the fuel metering means A by a metering control device B, the amount of fuel in the fuel system F is adjusted to match the amount of intake air in the intake passage 7. In the fuel metering supply device for a gasoline injection engine configured to meter and inject fuel from the fuel injector 13 into the intake passage 7, the metering control device B is configured with a negative pressure actuator 35, and the negative pressure actuator The negative pressure operating chamber 35a of 35 was communicated with the intake path portion 7a downstream of the throttle valve 9, and the operating output section 37 of the negative pressure actuator 35 was operatively connected to the metering input section 38 of the fuel metering means A. A fuel metering supply device for a gasoline injection engine characterized by: 2. The fuel metering means A is constituted by a pressure regulating valve 40, and the pressure regulating valve 40 is provided in the fuel supply path 14 and is connected to the fuel supply channel 14.
The spring base end 47a of the valve closing spring 47 of the pressure regulating valve 40 constitutes the metering input section 38, and the spring base end 47a is connected to the negative pressure actuator 35. The fuel metering supply device for a gasoline injection engine according to claim 1, which is configured to be interlocked and connected to the operation output portion 37 so as to be able to adjust tension. 3. The fuel metering means A is composed of a flow rate control valve 55, and the flow rate control valve 55 is provided in the fuel supply path 14 so that the fuel supply path 14
The metering input section 38 of the flow control valve 55 is operatively connected to the operation output section 37 of the negative pressure actuator 35. Fuel metering supply device for gasoline injection engines.