JPH1037861A - Automatic stop type electric pump - Google Patents

Abstract

(57) [Summary] [Problem] To automatically stop the electric pump system at the time of refueling expiration and when the supply side tank becomes empty without monitoring the liquid level in the fuel tank during refueling. . A signal is taken out from a liquid level sensor mounted in a fuel tank of a vehicle to detect a refueling amount, and at the same time, the presence or absence of fuel in a supply side tank is detected and controlled by a negative pressure of a pumping pipe.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric pump for supplying fuel to an automobile, a construction machine, a ship, or the like (hereinafter referred to as a vehicle).

[0002]

2. Description of the Related Art Conventional automatic stop type electric pumps are
No. 59-131998 is known. This was for general households, and had to support the electric pump body by hand until refueling stopped automatically. In addition, since the electric pump that can be mounted on a vehicle or the like does not have an automatic stop mechanism, it has been troublesome to rely on visual and auditory senses to stop refueling.

[0003]

The prior art has a problem that the liquid level must be monitored so that fuel does not leak from the fuel tank during refueling because there is no automatic refueling stop mechanism.

According to the present invention, the refueling expiration is accurately determined without monitoring the liquid level in the fuel tank during refueling, and the system is automatically stopped when the supply-side tank becomes empty. The purpose is to let them.

[0005]

In order to achieve the above object, the present invention provides an electric pump body for supplying fuel from an external container of a vehicle, a negative pressure switch operated by a negative pressure of the pump, and a vehicle. A signal from a mounted liquid level sensor and a controller that controls the electric pump based on an input signal from the liquid level sensor, wherein the controller determines the amount of refueling based on a signal from the liquid level sensor. At the same time, the presence or absence of fuel in the supply tank is detected and controlled by the negative pressure of the pumping pipe.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows an embodiment of an automatic stop type electric pump according to the present invention, wherein 1 is a housing showing existing vehicle-mounted parts, 2 is a battery, 3 is a fuel gauge, and 4 is a liquid. Surface sensor, 5 is a fuel tank, 6 is an electric pump body containing a motor and an impeller, 7 is a supply side tank, 8 is a pumping pipe for pumping fuel from the supply side tank, and 9 is connected so as to communicate with the pumping pipe 8. A discharge pipe for supplying fuel to the fuel tank 5; a negative pressure switch 13 which is turned on and off by a negative pressure of the fuel passing through the pumping pipe;
Reference numeral 10 denotes a controller that supplies electric power to the electric pump body 6 using the battery 2 as a power source, detects a refueling amount by the liquid level sensor 4, and automatically stops the electric pump body 6. An operation switch for starting fuel supply to the tank 5, a main switch 14 for operating the apparatus, and a fuse 15 are provided.

FIG. 2 shows a control circuit configuration of the control unit 10.
The operation switch 11 and the negative pressure switch 13 are connected in parallel via the main switch 14, and the cathode side of the reverse connection prevention diode 16 is connected to the input side of the power supply circuit 17 and the voltage regulator 18 for supplying constant voltage power. Further, the output side is connected to a voltage amplifying circuit 19 for amplifying a signal from the liquid level sensor 4, a refueling level detecting circuit 20 for detecting a refueling amount, and a relay 22 for switching the electric pump 6 on and off.

The operation of the automatic stop type electric pump according to the present invention with the above circuit configuration will be described. First, the main switch 14 and the operation switch 11 are turned on, and the power supply circuit 17,
When the voltage regulator 18 is energized, the voltage amplifying circuit 1
9. Supply 5V to the refueling level detection circuit 20. As a result, the amount of refueling is input as a signal from the liquid level sensor 4, divided by the voltage dividing resistor 24 and taken into the voltage amplifying circuit 16. here,
A signal from the liquid level sensor 4 is amplified by a voltage amplifying circuit 19 so that the refueling amount can be accurately determined.
A voltage is output at 0.

The refueling level detection circuit 20 detects the refueling amount based on the amplified signal, and when it determines that the refueling amount is less than 100%, outputs 5 V to the transistor 21 and outputs the relay 2
2 is turned on to operate the electric pump 6. When it is determined that the refueling amount is 100%, the refueling level detection circuit 20 outputs 0 V to the transistor 21 to turn off the relay 22,
The electric pump 6 is stopped. At this time, when the electric pump 6 stops refueling, the negative pressure switch 13 is turned off and the power supply of the control unit 10 is also shut off because there is no negative pressure passing through the pumping pipe. Voltage amplification circuit 16
FIG. 3 shows the relationship between the amplified voltage and the amount of refueling.

As described above, the fuel supply amount is controlled by the voltage amplifying circuit 1.
Accurate and safe fuel refueling by amplifying and accurately judging in step 6 and linking the controller's power supply with a negative pressure switch that operates on and off with the negative pressure of the fuel passing through the pumping pipe. Can be.

[0011]

According to the present invention, the power supply of the controller and the negative pressure switch are linked at the same time when the fuel supply amount is accurately determined, and the electric pump is automatically stopped when the fuel on the supply side runs out. Therefore, it is not necessary to monitor the liquid level of the fuel tank during refueling.

[Brief description of the drawings]

FIG. 1 is a system diagram of an embodiment of an automatic stop type electric pump according to the present invention.

FIG. 2 is a control circuit diagram of the present invention.

FIG. 3 is a graph showing a relationship between an amplified voltage of a voltage amplifying circuit 19 and an oil supply amount.

[Explanation of Signs] 1 ... Housing, 2 ... Battery, 3 ... Fuel gauge, 4 ... Liquid level sensor, 5 ... Fuel tank, 6 ... Electric pump main body, 7 ... Outside supply tank, 8 ... Pumping pipe, 9 ... Discharge pipe,
10 controller, 11 operation switch, 13 negative pressure switch, 14 main switch, 15 fuse.

Claims (1)

[Claims] An automatic stop type electric pump comprising: a fuel tank mounted on a vehicle; and an electric pump for supplying fuel to the fuel tank from an external container. A sensor for detecting the liquid level of the electric pump and a controller for controlling refueling of the electric pump according to a signal from the sensor.When refueling expires, and when the supply-side tank becomes empty, refueling is performed. An automatic stop type electric pump characterized by automatically stopping.