JPH05288589A - Liquid level measuring device - Google Patents

Abstract

PURPOSE:To display beforehand a fuel shortage caused by a trouble of a transfer pump by providing a monitoring circuit, and monitoring separately only a resistance value of a fuel sender of a unilateral tank into which a drain pipe is inserted. CONSTITUTION:A residual quantity of a unilateral tank into which a drain pipe 6 is inserted, is monitored by means of a monitoring circuit 7 to detect a resistance value of a fuel sender 2. When fuel is about to ran out after a transfer pump 10 runs into trouble, the fuel sender 2 informs the fuel meter 4 side of abnormality. The monitoring circuit 7 opens a switch 9 swiftly to a signal from the fuel sender 2 side through a proper interface. When the switch 9 is opened, a resistance 8 inserted into a cable way from the senders 2 and 3 to the fuel meter 4 is operated, and the fuel meter 4 displays a fuel shortage. Thereby, even if the transfer pump 10 runs into trouble, the fuel shortage can be displayed beforehand to a driver.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention mainly relates to a liquid level measuring device for a saddle-shaped, twin-barrel atypical tank, which is installed so as to straddle a central drive shaft, such as a 4WD vehicle and a 4WS vehicle.

[0002]

2. Description of the Related Art If a conventional saddle type, twin-body tank is adopted,
Since the fuel is divided into right and left depressions and only one drain pipe can be installed, a transfer pump for transferring the fuel from one to the other (the side into which the drain pipe is inserted) was required. Also, two fuel senders are required to measure the remaining amount of fuel, and the combined resistance of these fuel senders is displayed on the fuel gauge.

[0003]

If the transfer pump fails, half the remaining amount can be read from the fuel gauge.
A situation of suddenly running out of fuel will occur. This is because the transfer pump fails and the transfer of fuel from one side to the other stops, and as a result, only the fuel on the side where the drain pipe is inserted bottoms out, but the combined resistance value input to the fuel gauge is This is because it is a value indicating half of the total amount of fuel.

[0004]

In order to eliminate the above-mentioned drawbacks, the present invention provides a fuel meter (4) in which a fuel sender (2) (3) is arranged in series in a saddle type, double-hulled tank (1). ), The monitoring circuit (7) for separately monitoring only the resistance value of the fuel sender (2) of the tank on the side where the drain pipe (6) is inserted is connected to the fuel sender (2). ) And the electric line (5) from the fuel sender (3) to the fuel meter (4), and the monitoring circuit (7) is provided in the electric line (5) from the connection point to the fuel meter (4). A liquid level measuring device characterized by inserting in series a circuit in which a controlling switch (9) and a resistor (8) are connected in parallel, and a liquid level measuring device in which a warning lamp lighting circuit of the liquid level measuring device is attached to a monitoring circuit. It is intended to provide a device.

[0005]

FIG. 2 shows an embodiment of the present invention. In FIG. 2, R1 is a fuel meter protection resistor, IC1 to IC3 are comparators that monitor the remaining amount, and TR1 is a transistor that lights a fuel warning.

In FIG. 1, the remaining amount of the one-side tank in which the drain pipe (6) is inserted is determined by a monitoring circuit (7) for detecting the resistance value of the fuel sender (2). As described above, the fuel sender (2) informs the fuel meter (4) of an abnormality before the transfer pump (10) fails and the one-side tank runs out of fuel. The monitoring circuit (7) promptly opens the switch (9) via a suitable interface in response to a signal from the fuel sender (2) side. When the switch (9) is opened, the resistor (8) inserted in the electric path from the senders (2) and (3) to the fuel meter (4) works, and the fuel meter (4) indicates that the fuel is exhausted. The alarm lamp (11) may be turned on at the same time as the fuel exhaustion indication in the monitoring circuit (7) via an appropriate interface.

In FIG. 2, in a normal state, the fuel senders (2) and (3) are monitored by IC1 and IC2, respectively, and their amounts are displayed on the fuel meter (4). AND is transmitted to the timer circuit, and the timer circuit counts the time when the value becomes equal to or less than the specified value, and the alarm lamp is turned on after the remaining amount is surely low. When the transfer pump (10) fails, the IC 3 monitors the remaining amount of the one-side tank in which the drain pipe (6) is inserted. IC3 makes an OR judgment with IC1 and IC2, so that when there is a failure, IC1 and IC2
Priority is given to 2 and the warning light (1) is turned on.

[0008]

As a result, even if the transfer pump fails, the driver can be informed and warned beforehand that the fuel will run out. The transfer pump uses an electric type, but when it fails, the fuel meter can display that fact,
Further, since the warning can be given by the warning light, the reliability of the transfer pump alone is not required as in the conventional case. Therefore, an inexpensive pump can be adopted, and even if the present invention is adopted, there is no inconvenience in profitability, and there is a great effect of relieving the driver's mental damage caused by running out of fuel.

[Brief description of drawings]

FIG. 1 is a circuit diagram showing an outline of the present invention.

FIG. 2 is a circuit diagram showing an embodiment of the present invention.

[Explanation of symbols]

 1 Tank 2 Fuel Sender 3 Fuel Sender 4 Fuel Meter 5 Electric Circuit 6 Drain Pipe Surface 7 Monitoring Circuit 8 Resistance 9 Switch 10 Transfer Pump 11 Warning Light

Claims (2)

[Claims] A drain pipe (5) for a conventional electric circuit (5) leading to a fuel meter (4) in which a fuel sender (2) (3) is arranged in series in a saddle-shaped, double-hulled tank (1). A monitoring circuit (7) for separately monitoring only the resistance value of the fuel sender (2) of the side where the fuel cell (6) is inserted is provided with an electric circuit from the fuel sender (2) and the fuel sender (3) to the fuel meter (4). (5)
A circuit in which a switch (9) controlled by the monitoring circuit (7) and a resistor (8) are connected in parallel is inserted in series in an electric path (5) that is provided by being connected to the fuel meter (4) from the connection point. A liquid level measuring device characterized in that 2. The liquid level measuring device according to claim 1, wherein an alarm lamp lighting circuit is attached to the monitoring circuit.