JPH0533729Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention is directed to a fuel tank for an automobile, particularly a double fuel tank in which a protrusion is formed at the bottom of the tank, and the inner bottom of the tank is divided into two chambers by the protrusion. This invention relates to a liquid level detection device for a body-type fuel tank.

[Prior Art] As a conventional liquid level detection device of this type for an automobile fuel tank, there is one shown in FIGS. 4 and 5, for example. This fuel tank 1 for an automobile is an irregularly shaped (double-hull type) tank in which a protrusion 1b is formed on the bottom surface 1a of the fuel tank to avoid a fuel tank attachment part of a protrusion (not shown). Part 1b
Accordingly, the room is divided into an installation room 3a where the pump 2 is installed and a non-installation room 3b where the pump 2 is not installed. Further, the installation chamber 3a is equipped with a discharge pipe 4 connected to the pump 2, and a return tube 5 to which excess fuel not burned by the engine is returned.The return tube 5 is connected to a jet pump 6. is assembled. Furthermore, a liquid guide pipe 7 is attached to this pump 6, and the tip of this liquid guide pipe 7 is located at the inner bottom of the non-installed chamber 3b. As a result, when the fuel is returned into the tank 1 via the return tube 5,
The fuel in the non-installation chamber 3b is sent to the installation chamber 3a via the liquid guide pipe 7.

Furthermore, both the installation chamber 3a and the non-installation chamber 3b are equipped with float type liquid level detectors 8 and 9 for detecting the amount of liquid in these chambers 3a and 3b. Detectors 8 and 9 are installed, and these liquid level detectors 8 and 9 are connected in parallel as shown in Fig. 5, and the combined resistance of these liquid level detectors 8 and 9 causes a The liquid level is indicated by a liquid level gauge 10. Note that 11 represents an ignition switch, and 12 represents a power source.

[Problem to be solved by the invention] However, in such a conventional fuel tank liquid level detection device, the liquid level detector 8 provided in the installation chamber 3a and the liquid level detector provided in the non-installation chamber 3b are separated. Since the liquid level gauge 10 is operated by the combined resistance with 9 and displays the liquid level, for example, if the liquid guide pipe 7 is clogged, the inside of the non-installed chamber 3b If a problem occurs in which the liquid is not transferred to the installation chamber 3a, the fuel remains in the non-installation chamber 3b,
Even if the fuel in the installation chamber 3a side is consumed and it is no longer possible to supply fuel to the engine, the liquid level gauge 10 indicates that there is no fuel in the tank based on the reading from the liquid level detector 9 in the non-installation chamber 3b side. There was a problem that the reliability of the indication by the liquid level gauge was low because the indication was that the liquid remained.

[Means for Solving the Problems] The present invention has been devised by focusing on the problems of the conventional art, and is directed to a liquid guide pipe disposed across the installation chamber 3a and the non-installation chamber 3b. During step 7, when the pump 6 operates and the fuel in the non-installation chamber 3b is flowing toward the installation chamber 3a, the circuit is closed.
When the pump 6 is not operated and its flow is not occurring, the switch that is opened is placed in the non-installed room 3.
It is connected to the liquid level detector 9 on the b side, so that even if there is fuel left in the non-installation chamber, if there is no more fuel in the installation chamber, the flow meter will issue an EMPTY instruction. An object of the present invention is to provide a fuel tank liquid level detection device that can solve the conventional problems.

[Example] The present invention will be explained in detail below based on the example shown in FIGS. 1 to 3. The same parts between the structure of this example and the structure explained in the conventional example The reference numerals used will be used, and explanations of the same structural parts will be omitted.

That is, in this embodiment, a switch 13 operated by a liquid flow is provided in the middle of a liquid guiding pipe 7 which is disposed astride between the installation chamber 3a and the non-installation chamber 3b.

The structure of this switch 13 is as shown in FIG. 2, and a rocking body 14, which swings with the liquid flow in the liquid guide pipe 7, is pivoted into an outer cylinder 15 connected to the liquid guide pipe 7. Interior. Furthermore, a pair of contact plates 16 are provided on the end face of the rocking body 14, and a pair of contacts 17 that can come into contact with the contact plates 16 are provided on the outer cylinder 15.
is installed. This switch 13 is connected in series to the circuit of the liquid level detector 9 as shown in FIG.

Therefore, according to this embodiment, for example, when the liquid guide pipe 7 is not clogged, the fuel in the non-installation chamber 3b is supplied to the installation chamber 3a by the driving force of the pump 6, and normal operation is performed. Fuel consumption is achieved. At this time, since the oscillator 14 of the switch 13 is maintained in a closed circuit state by the liquid flow of fuel moving from the non-installation chamber 3b to the installation chamber 3a, the liquid level is measured by the combined resistance value of the liquid level detectors 9 and 8. At 14, a normal liquid level indication is given.

However, if a problem occurs in which the fuel in the non-installation chamber 3b is not transferred to the installation chamber 3a due to clogging of the liquid guide pipe 7, etc., the contact point 17 and the connection plate 16 are switch away 1
3 is opened, the circuit of the liquid level detector 9 on the side of the non-installation chamber is opened, so even if there is residual liquid in the non-installation chamber 3b, if the fuel in the installation chamber 3a is consumed, According to the liquid level detector 8 in the installation chamber 3a
EMPTY is displayed on the liquid level gauge 10. Therefore, as described in the conventional example, the indication on the level gauge 10 that there is fuel remaining in the tank even though there is no fuel in the installation chamber 3a is eliminated, and the reliability of the indication by the level gauge 10 is eliminated. You can increase your sexuality.

[Effects of the invention] As described above, the present invention is divided by the protrusion 1b provided at the bottom into an installation chamber 3a in which a discharge pipe is installed and a non-installation chamber 3 in which a discharge pipe is not installed.
b, and the fuel in the non-installation chamber 3b is transferred to the installation chamber 3.
The installation chamber 3 is equipped with a transfer pump 6 for transferring to a.
In a fuel tank 1 equipped with variable resistance type main and sub liquid level detectors 8 and 9 in each of the non-installed chambers 3a and 3b, a switch 13 which is opened when the transfer pump 6 does not operate is connected to the sub liquid level detector. Since this is a liquid level detection device for the fuel tank connected to the fuel tank 9, it can be used to detect a problem in which the liquid in the non-installation chamber 3b is not transferred to the installation chamber 3a due to, for example, clogging of the liquid guide pipe 7. When the switch 13 is opened and the liquid level is displayed using only the output value from the main liquid level detector 8 installed in the installation chamber 3a, the liquid in the installation chamber 3a is consumed. For example, regardless of the presence or absence of liquid in the non-installation chamber 3b.
This eliminates the possibility of instructing EMPTY and causing a gas shortage, which has the effect of ensuring display reliability and driving safety.

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram showing an embodiment of the flow level detection device according to the present invention, Fig. 2 is an explanatory diagram of the switch structure, Fig. 3 is its electrical circuit diagram, and Fig. 4 is a conventional liquid level detection device. FIG. 5 is an electrical circuit diagram of the conventional example. 13... Switch, 14... Rocking body, 15...
Outer cylinder, 16...contact plate, 17...contact.

Claims (1)

[Scope of utility model registration request] divided by a protrusion 1b provided at the bottom,
It has an installation chamber 3a in which a discharge pipe is installed and a non-installation chamber 3b in which no discharge pipe is installed, and includes a transfer pump 6 for transferring fuel from the non-installation chamber 3b to the installation chamber 3a, and the installation chamber 3a and the non-installation room 3b
In the fuel tank 1 equipped with variable resistance type main and sub liquid level detectors 8 and 9, respectively, a switch 13 is opened when the transfer pump 6 is not operated.
A liquid level detection device for a fuel tank, characterized in that: is connected to the auxiliary liquid level detector 9.