JPS62150049A - Fuel feed device for internal-combustion engine - Google Patents

Abstract

PURPOSE:To make the structure simple and small-sized and to feed fuel in response to the remaining quantity by constituting a fuel pump feeding fuel forcibly to a carburetor 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, a fuel 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 13 in the control unit 10 and is fed to a control circuit 14 and a drive circuit 15 as the driving power supply, and when a fuel detecting sensor 16 detects a predetermined decrease or less of the float chamber 12a of a carburetor 12, a drive signal is fed to the fuel pump 11 via the control circuit 14.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of application in the fI industry) This invention relates to a fuel supply device for an internal combustion engine that supplies fuel to a carburetor.

(Prior Art) For example, in an internal combustion engine mounted on a motorcycle, fuel is forcibly supplied to its carburetor from a fuel tank by the operation of a fuel pump.

By the way, this fuel pump uses a motor and is powered by a battery.

(Problems to be Solved by the Invention) By the way, if a battery is used as a drive power source for a fuel pump, when the battery is over-discharged, the operation of the fuel pump may become unstable, resulting in a decrease in discharge performance or a risk of discharging. There is.

For this reason, if the fuel pump were to be a mechanical type and driven directly by the power of the internal combustion engine, the problems described in section 11 would either be solved, or the device would become complicated and large.

The present invention has been made in view of the above points, and an object of the present invention is to provide a fuel supply device for an internal combustion engine, which has a compact structure inside the cylinder, and can constantly supply fuel to a carburetor depending on the residual star.

(F Stage for Solving the Problem) In order to solve the problem of node movement, the present invention provides a fuel supply system for an internal combustion engine that forcibly supplies fuel to a carburetor by driving a fuel pump. The driving source of this fuel pump is the primary voltage of the ignition device, and the control circuit is operated by the detection signal of the fuel detection sensor provided in the +iFr carburetor. It is characterized in that the driving power source is supplied for ;t1]1.

(Function) In the present invention, the fuel pump constituted by a piezoelectric pump is driven by the primary voltage of the ignition device.

The fuel pump is a control circuit that is activated by the detection signal of the fuel detection sensor during operation of the internal combustion engine, and the discharge amount of the fuel pump is adjusted by controlling the drive power supply according to the remaining fuel t. .

(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 an 8-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, for example, a multi-pole magneto, which generates electricity. The charging coil 2 is connected to a capacitor 4 via a diode 3.
It is connected to the. Capacitor 4 has 1. The ignition coil 5 is connected to the ignition coil 5. The ignition coil 5 is made up of a -f-ignition gator 5a and a primary gage coil 5b. or connected.

The anode of the thyristorph is connected between the 1171 tie auto 3 and the capacitor 4, and the cathode is grounded. A balsa coil 8 is connected to the gate of the thyristor 7 via a diode 9.

Between the capacitor 4 and the ignition coil 5, ;l, (I
A fuel pump 11 is connected through the fourth part 10, and the primary side voltage of the ignition device l serves as a driving power source for the fuel pump 1, and this driving power source is changed to +t+ according to the remaining amount of fuel in the carburetor 12. Control.

The fuel pump 12 is constructed using a bimorph piezoelectric element among piezoelectric elements, and generates piezoelectricity by applying voltage! , f is used as a pump.

The control unit 10 is composed of a power supply circuit 13, a control circuit 14, and a drive circuit 15. The power supply circuit 13 converts the primary side voltage of the ignition device 1 into a predetermined constant voltage, and supplies the drive power for the control circuit 14 and the drive circuit 15. It becomes.

] In the control circuit 14, a fuel detection sensor 16 is provided in the float chamber 12a of the carburetor 12, and this fuel detection sensor 16 detects the remaining amount of fuel by detecting the position of the float 17. ing.

Fuel detection sensor! 6 is constituted by, for example, a photo sensor, a two-tone sensor, etc., and outputs a detection signal 12 when the float 17 falls to a predetermined position. ;t+
Based on this detection signal, the control circuit 14 outputs an opening/opening signal to drive the drive circuit 15, thereby controlling the drive power for the fuel pump 11 on and off. When the fuel pump 11 is driven, fuel is supplied from the fuel tank 18 to the float chamber 12a of the carburetor 12.

Next, the operation of this embodiment will be explained.

When the internal combustion engine is driven, an AC force is induced in the charging coil 2 of the ignition device 1, and this AC power is passed through the diode 3.
is rectified 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 charge stored in the capacitor 4 is discharged through the primary coil 5a of the ignition coil 5, generating a high voltage in the secondary coil 5b, and generating an ignition spark in the ignition plug 6. It is driven by an internal combustion engine.

The primary side voltage of this ignition device 1 is manually supplied to the power supply circuit 13 and the drive circuit 15 of the control section 10, and when the control circuit 14 does not receive a detection signal from the fuel detection sensor 16, the drive circuit 15 controls the fuel pump. 11 drive power is cut off.

When the fuel in the funnel chamber 12a of the carburetor 12 decreases to a predetermined position on the float 17 due to the rotation of the internal combustion engine, the fuel detection sensor 16 is activated and outputs a detection signal. When the control circuit 14 receives manual input from the detection chair, the drive circuit 15 is activated, and the drive power source for the fuel pump 11 is connected to drive the fuel pump 11.

By driving the fuel pump 11, the fuel in the fuel tank 18 is forcibly supplied to the float chamber 12a of the carburetor 12, and the amount of fuel increases and the position of the float 17 rises by L.

Due to this FL, the fuel detection sensor 16 stops outputting the detection signal, and the control circuit 14 stops the operation of the drive circuit 15, so the drive power for the fuel pump 11 is cut off and stopped.

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

(Effects of the Invention) As described above, the present invention drives a fuel pump constituted by a piezoelectric element pump with the primary side voltage of an ignition device, and uses a control circuit operated by a detection signal of a fuel detection sensor to power the fuel pump. Since the fuel pump can be controlled with a simple structure, the fuel pump can be controlled. Moreover, since the primary side voltage of the ignition device is used as the driving voltage, fuel can be supplied to the carburetor in response to residual stars while the internal combustion engine is operating.

[Brief explanation of drawings]

The figure is a circuit diagram of a fuel supply system for an internal combustion engine to which the present invention is applied. 1... Ignition device 2... Charging coil 5... Ignition coil 6... Spark plug 7... Thyristor 8... Pulsar coil 10... Control section ゛11... Fuel pump 14...・Control circuit 15... Drive circuit 16... Fuel detection sensor

Claims (1)

[Claims] In a fuel supply device for an internal combustion engine that forcibly supplies fuel to a carburetor by driving a fuel pump, the fuel pump is configured with a piezoelectric element pump, and the driving power source of the fuel pump is the primary voltage of the ignition device. . A fuel supply device for an internal combustion engine, wherein the drive power source is controlled by a control circuit activated by a detection signal from a fuel detection sensor provided in the carburetor.