JPS62150041A - Fuel feed device of internal-combustion engine - Google Patents

Abstract

PURPOSE:To make the structure simple and small-sized and facilitate the layout by constituting an acceleration pump feeding augmentation fuel during quick acceleration with a piezoelectric element pump and using the primary voltage of an ignition device as its driving power supply. CONSTITUTION:A capacity discharge type contactless ignition device 1 has a charging coil 2 rotated synchronously with a crank shaft, and the said coil 2 is connected to an ignition coil 5 via a diode 3 and a capacitor 4. In this case, an acceleration pump 11 made of a bimorph piezoelectric element is connected between the capacitor 4 and the ignition coil 5 via a control unit 10. The primary voltage of the ignition device 1 is converted into the predetermined constant voltage by a power supply circuit 14 as the driving power supply, and when an output signal is fed to the control circuit 13 from a quick- acceleration detecting sensor 17, a drive signal is fed to the acceleration pump 11 via the drive circuit 14 for a fixed time.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a fuel supply system for an internal combustion engine equipped with an accelerator pump.

(Prior Art) For example, some internal combustion engines mounted on motorcycles include an acceleration pump in their intake system.

When the throttle valve is suddenly opened, this accelerator pump
It works by forcing fuel into the intake system to prevent the mixture from becoming temporarily lean. by the way,
This accelerator pump has a mechanical type (Problems to be solved by the invention) As described above, since the accelerator pump is composed of a mechanical type, the structure is complicated, and since it is provided in the carburetor, it has a difficult layout. There are certain limitations. Particularly in recent times, where it is difficult to secure an installation space, miniaturization of devices has become even more important.

The present invention has been made in view of the above, and an object of the present invention is to provide a fuel supply device for an internal combustion engine that is simple in structure and small in size.

(Lower stage for solving the problems) In order to solve the nM problems, the present invention provides a fuel supply system for an internal combustion engine that is equipped with an acceleration pump that feeds fuel into a carburetor during sudden acceleration. It is composed of an element pump, and the driving power source of this acceleration pump is the primary voltage of the ignition device, and the control circuit is activated by the detection signal of the sudden acceleration detection sensor that detects sudden acceleration operation, and controls the driving power source mentioned above. It is characterized by operating the Shinki acceleration pump for a certain period of time.

(Function) In this invention, since the accelerator pump composed of a piezoelectric element pump is driven by the primary voltage of the ignition device, a driving power source that enables the accelerator pump to operate is provided even while the internal combustion engine is operating. ing.

In addition, the acceleration pump is composed of a piezoelectric element pump and is driven by the primary voltage of the ignition device, so it is easy to use. It has a unique structure and is small in size.

(Embodiment) Hereinafter, an embodiment of the present invention will be described in detail based on the accompanying drawings.

In the figure, reference numeral 1 denotes a capacitive discharge type non-contact ignition device, and a charging coil 2 of this ignition device 1 rotates in synchronization with the crankshaft of an internal combustion engine 3, and generates electricity at, for example, 8.7 g. Charging coil 2 is connected to capacitor 4 via diode 3. An ignition coil 5 is connected to the capacitor 4, and the ignition coil 5 consists of a secondary coil 5a and a primary coil 5b, and a spark plug 6 provided in the internal combustion engine is connected to the secondary coil 5b.

The anode of the thyristorph is connected between the diode 3 and the capacitor 4, and the cathode is grounded. A pulser coil 8 is connected to the gate of the thyristorph through a diode 9.

An acceleration pump 11 is connected between the capacitor 4 and the ignition coil 5 via a control unit 10, and the primary voltage of the ignition device 1 serves as a driving power source for the acceleration pump 11.

The acceleration pump 11 is constructed using a bimorph piezoelectric element among piezoelectric elements, and operates as a pump by utilizing the vibration of the piezoelectric element due to the application of voltage.

The control unit 10 is composed of a power supply circuit 12, a control circuit 13, and a drive circuit 14. The primary side voltage of the ignition device 1 is converted into a predetermined constant voltage by the ilt source circuit 12, and the drive power for the control circuit 13 and the drive circuit 14 is provided.

A detection signal from a sudden acceleration detection sensor 17 connected to an operating lever such as a throttle lever 15 or an accelerator pedal 16 is input to the control circuit 3.

As shown in FIGS. 2 to 4, this sudden acceleration detection sensor 17 is slidably provided on a support shaft 19 provided on a holder 18 against a cam 20 or a spring 21. A contact 22 is insulated and attached to one side wall 18a of the holder 18, and a signal line 23 of the control circuit 13 is connected to the other side wall 18b, and a throttle wire 24 is inserted therethrough.

A contact point 25 provided at the tip of the throttle wire 24 faces the tapered portion 20a of the cam 20, and the slot
- When the I-torque wire 24 is pulled at a normal operating speed, the bent portion 25a is engaged with the tapered portion 20a of the cam 20, as shown in FIG. 3, and the cam 20 is moved against the spring 21. Therefore, the contact 25 or the contact 22 of the throttle lever 24 is not contacted, and the detection signal is not supplied from the signal line 23 to the control circuit 13.

On the other hand, if the throttle wire 24 is rapidly pulled during rapid acceleration, the contact 25 of the throttle wire 24 will open as shown in FIG.
The bent portion 25a of the cam 20 slides on the tapered portion 20a of the cam 20 and rides on the cam 20.

For this reason, the tip end 25b of the contact 25 of the throttle wire 24 contacts the contact 22, energizes it, and sends a detection signal from line 18 to the control circuit 13.

When the II control circuit 13 receives a detection signal or a human input, the drive circuit 14
is operated to supply driving power to the acceleration pump 11 for a certain period of time. The acceleration pump 11 is provided in the vaporizer 25, and by driving this acceleration pump 11,
Fuel is forcibly fed from the fuel tank 26 to the intake passage of the carburetor 25.

Fuel is stored in the float chamber 25a of the carburetor 25 in the fuel tank 2.
From G, τa is co-supplied according to the remaining 9 in the float chamber 25a.

Next, the operation of this embodiment will be explained.

An alternating current output is induced in the charging coil 2 by the driving of the internal combustion engine, and this alternating current output is rectified by the diode 3 and charged to the capacitor 4. On the other hand, a pulse is output from the balsa coil 8 in accordance with the rotational speed of the internal combustion engine, and this pulse is inputted to the positive side output or the gate of the thyristorph via the diode 9.

As a result, the thyristor 7 becomes conductive, and the electric charge stored in the capacitor 4 is released through the primary coil 5a of the ignition coil 5, producing a high voltage in the secondary coil 5b, and generating an ignition spark at the ignition plug 7. The internal combustion engine is then driven.

The primary side voltage of this ignition device 1 is inputted to the power supply circuit 12 and the drive circuit 15 of the control unit 10, and when the i-control circuit 13 receives no detection signal from the sudden acceleration detection sensor 17, the drive circuit 14 outputs the acceleration pump to the i-control circuit 13. 11 drive power is cut off.

Then, the throttle lever 15 or the accelerator pedal 16
When normal acceleration is performed by operating the throttle wire 24, the 1g point 25 of the throttle wire 24 moves while being connected to the cam 20, so the contact 25 of the throttle wire 24 is connected to the ground, r, +7. Do not touch 22. Therefore, since the detection number 113 is not input to the control circuit 13, the drive circuit 14 cuts off the drive power for the acceleration pump 11 and does not drive it.

On the other hand, during sudden acceleration, the pulling speed of the throttle wire 24 becomes faster, so the contact 25 of the throttle wire 24 rides north of the cam 20, contacts the contact 22, and is energized, and the detection signal 13 indicates a sudden acceleration state. is input to the control circuit 13. This control circuit 13 operates a drive circuit 14 for a set period of time, and applies a power supply voltage to the acceleration pump 11 to drive it.

In the acceleration pump 11, the pressure TL element f- vibrates depending on the frequency of the primary side voltage of the ignition device, and fuel is supplied from the fuel tank 26 to the intake passage of the carburetor 25. This fuel tank 26
The operation is responsive and starts immediately when voltage is applied.

Moreover, although the acceleration pump 11 is provided in the vaporizer 25,
It has a simple structure using piezoelectric elements and is compact, making it easy to secure installation space.

In this embodiment, the driving power for the fuel pump 11 is obtained from between the capacitor 4 and the ignition coil 5 of the ignition device 1, but the output of the charging coil 2 may be obtained directly.

(Effects of the Invention) As described above, the present invention drives an acceleration pump composed of a piezoelectric element pump with the primary voltage of an ignition device, and
The control circuit uses the detection signal from the sudden acceleration detection sensor that detects sudden acceleration operations to control the drive power supply and drive the acceleration pump for a certain period of time. Operates by applying primary voltage. Therefore, the accelerator pump has a simple structure and can be downsized, making it easy to secure the installation space.

[Brief explanation of drawings]

Fig. 1 is a circuit diagram of a fuel supply system for an internal combustion engine to which the present invention is applied, Fig. 2 is a sectional view of a sudden acceleration sensor, and Figs. 3 and 4 are sectional views showing the operating state of the sudden acceleration sensor. . l...Ignition device 2...Charging coil 5...Ignition coil 6...Spark plug 7...Thyristor 8...Balsa coil 10...Control unit 11...Acceleration pump 13...・Control circuit 14... Drive circuit 17... Rapid acceleration sensor 25... Carburetor

Claims (1)

[Claims] In a fuel supply device for an internal combustion engine equipped with an acceleration pump that feeds fuel into an intake system during rapid acceleration, the acceleration pump is configured with a piezoelectric element pump, and the driving power source of the acceleration pump is the primary voltage of the ignition device, A fuel supply device for an internal combustion engine, wherein a control circuit that is activated by a detection signal from a sudden acceleration detection sensor that detects a sudden acceleration operation controls the drive power source to drive the acceleration pump for a certain period of time.