JPH01199900A - Oil feed device with gas sensor and oil kind identification method in the same - Google Patents

Abstract

PURPOSE:To provide an oil feed device easy to handle, by providing a control portion with a valve opening identification circuit for judging an opening and closing valve of a nozzle as being opened based on the output signal from a pressure detector and with an oil kind identification circuit. CONSTITUTION:When a spout 8 of a nozzle 7 is inserted in an oil feed opening 35 and an opening and closing valve 32 is opened by operating a lever 33, a valve opening identification circuit 41, comparing the decreased value of an oil pressure signal e with a valve opening identification valve signal d, judges the value 32 as being opened, thereby outputting a valve opening identification signal (f). An oil kind identification circuit 45a measures time by counting clock signal (i), compares the value of detection signal (j) generated during this measurement or at the end thereof with the value of an oil kind identification value signal (h), outputs an oil feed proceeding signal k, provided that the former value does not exceed the latter value, thereby cleaning a gas sensor 23 and air supply pipes 28, 29 and 30 with the air free from oil gas and brings the nozzle 7 back in a nozzle case 13 when a fuel tank 36 becomes full and the valve 32 is closed, thereby eliminating the need to fit the nozzle with a sensor and providing an oil feed device easy to handle.

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application The present invention relates to an apparatus for supplying fuel oil to automobiles, which is used in gas stations and the like.

(b) Prior Art At gas stations, equipment for supplying multiple types of oil, in particular gasoline and diesel oil, are installed at distances apart on the same premises. However, because the external shapes of the refueling devices are the same, people sometimes stop by mistake, and as a result, accidents often occur where a gasoline-powered vehicle is refueled with diesel oil and a diesel-fueled vehicle is refueled with gasoline. It is necessary to drain the oil from the fuel tank and oil passage of the automobile, which requires a large amount of expense and effort.

On the other hand, as a method for determining oil type, Japanese Patent Application Laid-Open No. 61-95245
Nimiranruhikin'a! , there are those that use the rate and original transparency.

The former is determined from the change in capacitance between the positive and negative electrodes when a part of the sensor is immersed in oil.
In the latter case, the light emitting part and the light receiving part are placed opposite each other, and when there is liquid between them, the determination is made based on the original intensity received by the light receiving part.

In addition, a gas sensor is used to detect the presence of fuel gas, and the type of oil cannot be determined.) Refueling device? The control device is shown in Japanese Utility Model Publication No. 51-2332.

(c) Problems to be Solved by the Invention When trying to determine the type of oil in an automobile fuel tank by adopting the method of detecting the dielectric constant or original permeability as the oil type determination method, The following problems arise.

Firstly, when a car is refueling, the amount of oil remaining in the fuel tank is generally low, and the distance from the refueling port to the oil is long, so if you do not insert the sensor very far into the tank, the oil will leak out. When attaching the sensor to the nozzle without submerging it, the sensor must be constructed to protrude significantly from the nozzle only during detection.The drive mechanism for this becomes complicated and takes up a large amount of space, making it difficult to operate the nozzle itself. Sex also gets worse.

Second, in some car models, the pipe connecting the fuel filler port and the fuel tank is extremely bent, making it impossible for the sensor to reach the oil.

On the other hand, a one-type gas sensor simply detects the fuel filler port and permits refueling.

Therefore, the present applicant has previously proposed a refueling device with a gas sensor (Japanese Patent Application No. 62-205554) which employs a gas sensor to determine the type of oil by detecting the concentration of the component gas to be detected contained in the oil vapor. -Suggestion friend. However, the following problems arise in devices for G oil (D oil (light oil), which has a low concentration, unlike gasoline), which has a high concentration of gases to be detected.

In other words, in the case of light oil vehicles, it may not be possible to determine whether or not the nozzle discharge pipe is inserted into the fuel filler port due to the low concentration of the component gas to be detected. There is.

Therefore, it has been considered to provide a refueling port sensor in the nozzle to notify the start of the determination, but this would be expensive due to explosion-proof problems, and there is a risk of failure or malfunction due to impact or rain.

(→ Means for solving the problem This method solves the above problem without installing a fuel filler port sensor, and also makes it possible to determine the type of oil.It consists of an oil feed pump and the downstream side of this pump. Open/close valve nozzle at end/L
/l-connection and a pressure detector is installed to detect the hydraulic pressure in the flow path between the two, which is opened at the tip of the nozzle and sucked through the gas supply pipe to guide the gas to the gas sensor. On the other hand, the control section includes a valve open judgment circuit that judges whether the on-off valve of the nozzle is open based on the output signal from the pressure detector, and a G oil that generates relatively high concentration target component gas. An oil type determination circuit is provided for determining whether the oil is D oil, which generates a detection target component gas at a relatively low concentration.

(e) When the oil pressure in the flow path is fully raised by the oil supply pump and the nozzle on-off valve is opened, the hydraulic pressure in the flow path on the upstream side of the on-off valve decreases. It is determined that the nozzle has been opened, that is, that the nozzle has already been inserted into the filler port, and based on this determination, the oil type determination circuit determines whether it is D oil or G oil based on the output signal from the gas sensor.
It is determined whether it is oil, and if it is determined that it is G oil, the refueling is stopped, or if it is determined that it is D oil, refueling is allowed.

(f) Example First, the first example based on the first invention will be described in Section 1.2, 3A.
, will be explained below based on Figure 4A.

In FIG. 1, (11) is a housing for a refueling system, which is made of concrete and installed on top of the island (2).

(3) is an oil pump (oil supply pump) that pumps oil from an oil storage tank (not shown) through an oil supply pipe (4) and a flowmeter (5).
).

(6) is a flow rate pulse transmitter, and every time the flow meter (5) measures a unit oil amount (for example, 1/Zoo lit/I/),
outputs flow rate pulse signals p.

(7) is a refueling nozzle equipped with a discharge pipe (8) at the tip, and a flow meter (
5).

@ is a nozzle fiy detection switch, which outputs a detection signal m2 when the nozzle/L' (7) is not engaged with the nozzle case, and outputs a small non-detection signal nQ when it is detached.

A is an indicator box that houses the refueling amount indicator (to),
aQ is the oil pump (3) t-A motor for rotating the oil pump, αη is a control unit containing an electric circuit described later, (g)
is a notification buzzer.

Al is a negative pressure generation source, and is an air pump of the vane type or Roots type, and is integrated with the air pump motor (2), which suctions when rotated in the forward direction and blows air when rotated in the reverse direction.

Qη is a gas sensor unit, and as shown in FIG. 2, gas sensor ■ is installed in internal passage 4, and passage c! 2t - An atmosphere opening passage (c) that opens to the atmosphere is formed, and a lightweight spherical blocking valve (to) is installed to close the atmosphere opening passage (c) when the pressure inside the passage (goods) is higher than atmospheric pressure. There is.

(E) is a stopper that prevents the blocking valve (7) from entering the passage (A), and @ is a signal line extending from the gas sensor.

(c) is an air supply pipe whose one end is extended and opened near the tip of the discharge pipe (8), and the other end is connected to the gas sensor unit (2), and the wire is the air pump α and gas sensor unit) 01) The air pipe that connects the air pipe (to) is the air pipe that connects the 9 air pump αg and the atmosphere, and there are 0 filters installed at the tip that also serve as Fi7 frame arresters.

(2) is an on-off valve built into the nozzle/I/ (7), which is opened and closed by the operation of Reno (-(to)).

041 is an alternating current pressure detector installed in the communication pipe αη, and 041 is the fuel filler port of the fuel tank (to) of the automobile.

In FIG. 4A, (b) is a counting circuit that counts the number of flow rate pulse signals p, outputs the counted value as a counted value signal E, and displays it on the oil supply amount display (g) as the oil supply amount.

(38a) is an oil pump motor drive circuit, which energizes the oil pump motor Q119 at low speed by inputting a non-detection signal n output from the nozzle detection switch @, and deenergizes it by inputting a refueling stop signal S, which will be described later. Alternatively, it is energized at full speed by inputting a refueling permission signal, which will be described later, and further deenergized by inputting a detection signal m.

(to) is the air pump motor drive circuit, and when the non-detection signal n is input, the air pump motor mt is energized to rotate in the normal direction, and the air pipe (c) and the sensor unit c! Air is sent to υ, air pipe head, air pump Q9, and air pipe (1) in this order, and then when the refueling stop signal S or refueling permission signal K is input, it is reversely energized and the flow is reversed. to send air, and when the detection signal m is input, it is deenergized.

- is the valve open judgment value setting circuit, which indicates the sudden drop coefficient value of the hydraulic pressure at the pressure detector installation position when the open/close valve (to) of the nozzle/L/(7) opens or when the hydraulic pressure drops. The pressure value, etc. to be reached is set in advance, and the setting ['t
- Valve open judgment value signal is output as a signal.

O]) In the Fi valve open judgment circuit, the hydraulic pressure signal e output from the pressure detector ■ and the valve open judgment value signal d are input, and when the non-detection signal n is input, the value of the hydraulic pressure signal C is When the value of the valve open judgment signal d is reached (when the open/close valve (to) of nozzle # (7) is opened), the valve open judgment signal f (one pulse) is detected.
Output.

The function is the oil type judgment value setting circuit, which is used to select between oil type D (for example, light oil) that generates a comparatively low concentration of gas to be detected and G oil (for example, gasoline) that generates gas to be detected at a relatively high concentration. The value (A value indicated by the dashed line in FIG. 3A) is set as the oil type determination value, and that value is output as the oil type determination value signal.

- is a clock signal generation circuit that outputs the clock signal IT-, ■ is a detection time setting circuit, and the air pipe operator's nozzle IL
/(7) In sufficient time for the nine oil gas sucked from the side end to reach the sensor (e) and for the detection signal j of the sensor (to) to change to an output value commensurate with the concentration of the component gas to be detected. 1. A time (for example, 2 seconds) is set, and this 1. A detection time signal U indicating time is output. In addition, when attaching the gas sensor unit to the hose QG or the nozzle /I/ (7), this time t1 can be further shortened by shortening the air pipe @.

(45a) is an oil type determination circuit, which is triggered by the input of the valve open determination signal f and determines the value of the detection time signal U, which is 1.
1 hour was counted and this 1. The value of the detection signal j and the value of the oil type determination signal at the end of the time are compared, and if the former value does not exceed the latter value, a refueling permission signal k (one pulse) t- is output, and if the former value does not exceed the latter value, a refueling permission signal k (one pulse) t is output. If there is, refueling stop signal S
(one pulse) and outputs a notification signal W for a certain period of time (for example, 10 seconds) to energize a buzzer (g) to notify that the vehicle does not use D oil.

In the gas sensor output curve of the third person figure, the solid line indicates the state of the detection signal j for the D oil amount, and the two-dot chain line indicates the state of the detection signal j for the G oil amount.

With the above configuration, the 1st O! I! The embodiment will be explained below in the order of operation during refueling.

When a customer's car comes to our office and removes the nozzle from the nozzle case (7), the output signal of the nozzle detection switch (2) changes from a detection signal m to a non-detection signal n, and the Then, the following operations ①, ②, ② are performed.

■Return to zero of the previous refueling amount count value in the counting circuit (b) (zero display on the refueling amount indicator (2)).

■Low speed energization of oil pump motor 011 (at this time, the third
In figure A, the oil pressure increases slightly, and the amount of oil due to the expansion of the hose GO is measured by the flowmeter (5), so two flow rate pulse signals p are output).

■The air pump Q'J is energized to rotate normally, and the air sucked in from the nozzle /l/ (7) side end of the air pipe (to) is sent to the sensor unit (2).

Next, insert the discharge pipe (8) of the nozzle (7) into the oil supply port (2), then operate the lever 03 to open the on-off valve (2), and the hydraulic pressure will drop as shown in Figure 3A. In other words, since the value of the hydraulic pressure signal e becomes small, the valve opening determination circuit compares the hydraulic pressure signal e and the valve opening determination value signal d to determine whether the on-off valve (to) has been opened (i.e. nozzle/ I/
It is determined that (7) has already been set to the fuel filler port (to), and a valve open determination signal f=i is output.

Then, the oil type determination circuit (45a) calculates 1 by counting the clock signal it. The time is measured, and the value of the detection signal j and the oil type judgment value signal h (Q
＠, and if the former value does not exceed the latter value, a refueling permission signal k is output and the oil pump motor a
・While energizing at full speed, the air pump motor (7
) is reversely energized to switch the air pump from the suction state to the air blowing state, and the gas sensor (2) and each air pipe @
, @, Have CI cleaned with air that does not contain oil or gas. When cleaning starts, the value of the detection signal j becomes smaller.

On the other hand, if the former value exceeds the latter value, a refueling stop signal st- is output to completely de-energize the oil pump motor (6), that is, refueling is stopped, and a refueling permission signal k is output. As before, the air pump motor Ht is reversely energized to perform cleaning, and in addition, a buzzer (G) is used to notify that the vehicle is not a D-turn vehicle.

The refueling work went smoothly and the fuel tank (to) was full.
7, and when the on-off valve (2) is closed, the hydraulic pressure becomes maximum and the nozzle ρ(7) 't- is returned to the nozzle case (2) (the detection signal mt- is output) and the oil pump motor αat-
When deenergized, the hydraulic pressure gradually decreases.

Note that even if the end of the nozzle (7) of the air pipe (branch) is submerged in oil while the air pump motor is rotating normally, that is, when the internal passage (a) of the gas sensor unit (2) is under negative pressure, it will not be released to the atmosphere. Since air flows in through the passage, the negative pressure in the passage Q is not strong enough to suck in the oil to this extent, so there is no risk of the oil itself reaching the gas sensor and damaging the gas sensor.

Examples of the inventions of cylinders 2, 3, and 4 will be described below, and the same components as in the first example will be given the same numbers and their explanation will be omitted.

Next, the second invention is No. 25j! Based on the example 1.2゜3
To explain Figures B and 4B, unlike the first invention, a drive time setting circuit is provided, and after the base pump (3) is driven, the flow path on the downstream side of the oil pump (3) is The oil pressure increase time signal V that takes 12 hours (for example, 1 second), which is the fixed time required to increase the hydraulic pressure to a pressure sufficient to determine that the on-off valve (2) is opened, is It is being output.

When a customer's car comes to our office and removes the nozzle/l' (7) from the nozzle case (to), the output signal of the nozzle detection switch (2) changes from a detection signal m to a non-detection signal n. In response, the oil pump motor drive circuit (38b) measures the waiting time by counting the clock signal i2, and turns on the oil bong motor QQ only during this 12-hour period.
Make Omura force (full speed force).

After 12 hours have passed and the oil pump motor aQ is deenergized, the oil pressure gradually drops as shown in Figure 3B, but when the on-off valve is opened, it drops all at once, and this is monitored. The oil type determination circuit (45b) compares the detection signal j with the oil type determination signal ri to determine the oil type, triggered by the valve open determination signal f output from the valve open determination circuit @no. When the determination is completed, a reverse rotation signal gt- is output and the air pump motor (
(e) is reversely energized, and only when it is determined that the oil type is D oil, a lubrication permission signal kt- is output to re-energize the oil pump motor a, making it ready for lubrication. The subsequent process was the same as in the first example, but it was determined that the oil was not D oil f'
At this time, the Fi candy oil permission signal k is not output, and therefore, the refueling disabled state is maintained and the buzzer Ql19 is energized to notify the user.

Next, the third invention will be explained based on the third embodiment.
To explain the causes of C and 4C, in the third embodiment, a control valve actuator is installed in the flow path between the oil pump (3) and the on-off valve (2) in Fig. 1, and a control valve is installed in Fig. 4C. After the drive circuit (goods) and the oil pump (3) are driven, the hydraulic pressure in the downstream flow path of the oil pump (3) is sufficient to determine that the on-off valve (2) is opened. A driving time setting circuit is provided which outputs an oil pressure increasing time signal V to set a fixed time of 12 hours required for raising the oil pressure to 12 hours.

A customer's car comes to our office and there is nozzle/l' (7)? When removed from the L-nozzle case (2), the nozzle detection switch (
2) output signal changes from detection signal m to non-detection signal n, ζfL11r: In response, oil pump motor drive times 1
2 and 38C) energize the oil pump motor Q. to full speed. Note that this energized state is maintained until the nozzle /l/ (7) is returned to the nozzle case, that is, until the detection signal m is input.

When the non-detection signal n is input, the control valve driving circuit Ir4 clocks 12 hours by clocking the clock signal ik, and during this 12-hour clock, it outputs the control valve energizing signal yt'' and activates the control valve IC'i. -Open it and close it at the same time as the timing ends.Then, the flow path between the control valve and the on-off valve will be kept in an increased pressure state.

When the on-off valve (to) is opened, the hydraulic pressure drops suddenly, and the
The oil type determination circuit (45b) compares the detection signal j with the oil type determination signal R and determines the oil type in response to the valve open determination signal f output from the valve open determination circuit @p. When the determination is completed, a reverse rotation signal gTh is output to reversely energize the air pump motor, and only when the oil type is determined to be oil D, a refueling permission signal of 2 is output to the control valve 61).
k is opened again to enable refueling, and this state is maintained until the detection signal m is input. The subsequent progress is the first
o Same as the embodiment, but when it is determined that the oil is not D oil, the refueling permission signal k is not outputted, so that the refueling disabled state is maintained and a notification is given by activating the buzzer oar.

The explanation of the fourth invention will be replaced with the explanation of the first and second embodiments.

(g) Effect Even if the refueling device is configured as explained above, and is used for oil types that are relatively difficult to generate detection target component gases, there is no need to provide a sensor for detecting the refueling opening at the nozzle lvK. When a refueling port sensor is installed on a nozzle, there is no need to worry about failure or malfunction of the refueling port sensor caused by impact or rain, and furthermore, since there is no need for a signal line to the nozzle, an easy-to-handle refueling device can be obtained. be.

[Brief explanation of the drawing]

Figure 1 shows the internal structure of the refueling device, Figure 2 shows the structure of the sensor unit, Figures 3A, 3B, and 3Co respectively show the time charts of the operations of each part in the embodiments 1.2.3. 4A, 4B, and 4C respectively show electric circuit blocks in the control unit in the 1.2.3 embodiments. (3)...Pump (5)...Flowmeter (7)
...Nozzle (8)...Discharge pipe (to), Kan, (to)...Air pipe (to)...Opening/closing valve (to)...Fuel filler port (to)...Fuel tank Patent applicant: Tominaga Seisakusho Co., Ltd. No. 3A, No. 3B, RJ3

Claims (1)

[Scope of Claims] 1) An oil supply pump, a motor for driving the pump, an oil supply hose connected to a flow path on the downstream side of the pump, a nozzle with an on-off valve connected to the tip of the oil supply hose, and the pump and the motor for driving the pump. A pressure detector is provided in the flow path between the on-off valve and detects changes in the hydraulic pressure in the flow path and outputs a hydraulic pressure signal corresponding to the hydraulic pressure, and one end is near the discharge pipe with a nozzle. This system is installed at a position where it comes into contact with the gas sucked in through the air pipe, which is extended to and a gas sensor that generates a detected concentration value signal, and is installed in a place where G oil, which generates a relatively high concentration of detection target component gas, and D oil, which generates a relatively low concentration of detection target component gas, are handled. The D oil device includes a valve open determination circuit that determines whether the on-off valve is opened based on the value of the hydraulic pressure signal after energizing the motor and outputs a valve open determination signal; Concentration of generated detection target gas and D
an oil type determination value setting circuit in which an intermediate value between the concentration of the detection target component gas generated from oil is set as the oil type determination value; 1. A refueling device with a gas sensor, comprising an oil type determination circuit that compares a determination value with a determination value and outputs a refueling stop signal on condition that the former value exceeds the latter value. 2) An oil supply pump, a motor that drives this pump, a refueling hose connected to the flow path on the downstream side of the pump, a nozzle with an on-off valve connected to the tip of the refueling hose, and between the pump and the on-off valve. A pressure detector is installed in the flow path and detects changes in the hydraulic pressure in this flow path and outputs a hydraulic pressure signal corresponding to the hydraulic pressure.One end extends to the vicinity of the nozzle discharge pipe and the other end It is installed at a position where it comes into contact with the air pipe connected to the negative pressure generation source and the gas sucked through the air pipe, detects the concentration of the target component gas generated from oil, and generates a corresponding detected concentration value signal. Equipped with a gas sensor to
A device for D oil installed in a place where G oil that generates a detection target component gas at a relatively high concentration and D oil that generates a detection target component gas at a relatively low concentration is handled, wherein the motor is operated for a certain period of time. a motor drive circuit for energizing; and a valve open determination for determining whether the on-off valve is opened based on the value of the hydraulic pressure signal after the motor is energized for the predetermined time and deenergized, and outputting a valve open determination signal. an oil type determination value setting circuit in which an intermediate value between the concentration of the detection target component gas generated from the G oil and the detection target component gas concentration generated from the D oil is set as the oil type determination value; and the valve opening circuit. An oil type determination circuit is provided which compares the detected concentration value and the oil type determination value upon generation of the determination signal, and outputs a refueling permission signal on the condition that the former value does not exceed the latter value. A refueling device with a gas sensor, which is characterized by: 3) An oil supply pump, a motor that drives this pump, a refueling hose connected to the downstream flow path of the pump, a nozzle with an on-off valve connected to the tip of the refueling hose, and a nozzle provided in the downstream flow path of the pump. a control valve provided in the flow path, and a pressure detector provided in a flow path between the control valve and the on-off valve, which detects changes in hydraulic pressure in the flow path and outputs a hydraulic pressure signal corresponding to the hydraulic pressure. , an air supply pipe whose one end extends to the vicinity of the nozzle discharge pipe and the other end is connected to a negative pressure source, and an air supply pipe that is installed at a position where it comes into contact with the gas sucked through this air supply pipe to detect gas generated from oil. A gas sensor that detects the concentration of the target component gas and generates a corresponding detected concentration value signal, and generates G oil that generates a relatively high concentration of the target component gas and a relatively low concentration of the target component gas. A D-oil device installed in a place where D-oil is handled, the control valve drive circuit closing the control valve after a certain period of time has elapsed since the motor is energized, and the value of the hydraulic pressure signal after the control valve is closed. A valve open determination circuit that determines that the on-off valve is opened and outputs a valve open determination signal, and an intermediate between the concentration of the detection target component gas generated from the G oil and the concentration of the detection target component gas generated from the D oil. The oil type judgment value setting circuit whose value is set as the oil type judgment value and the generation of the valve open judgment signal compare the detected concentration value and the oil type judgment value, and the former value is set as the latter value. 1. A refueling device equipped with a gas sensor, characterized in that it is equipped with an oil type determination circuit that outputs a refueling permission signal on the condition that the refueling permission signal does not exceed . 4) An oil supply pump, a motor that drives this pump, a refueling hose connected to the flow path on the downstream side of the pump, a nozzle with an on-off valve connected to the tip of the refueling hose, and between the pump and the on-off valve. A pressure detector is installed in the flow path and detects changes in the hydraulic pressure in this flow path and outputs a hydraulic pressure signal corresponding to the hydraulic pressure. It is installed at a position where it comes into contact with the air pipe connected to the negative pressure generation source and the gas sucked through the air pipe, detects the concentration of the target component gas generated from oil, and generates a corresponding detected concentration value signal. Equipped with a gas sensor to
A device for D oil installed in a place where G oil that generates a relatively high concentration detection target component gas and D oil that generates a relatively low concentration detection target component gas is handled, wherein the motor is energized. a step of increasing the hydraulic pressure in the downstream flow path of the pump; a step of opening the on-off valve to decrease the hydraulic pressure in the downstream flow path of the pump; and a step of detecting the drop in hydraulic pressure using the pressure detector. a detection step, and a step of determining the oil type based on the detected concentration value signal output from the gas sensor based on the detection of a drop in oil pressure by the pressure detector, and generating a refueling permission signal or a refueling stop signal. A method for determining the type of oil in a gas sensor-equipped oil supply device, comprising: