GB2170782A - Fuel supplying system - Google Patents
Fuel supplying system Download PDFInfo
- Publication number
- GB2170782A GB2170782A GB08603416A GB8603416A GB2170782A GB 2170782 A GB2170782 A GB 2170782A GB 08603416 A GB08603416 A GB 08603416A GB 8603416 A GB8603416 A GB 8603416A GB 2170782 A GB2170782 A GB 2170782A
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- Prior art keywords
- fuel
- fuel supplying
- supplying
- supplied
- preset
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B67—OPENING, CLOSING OR CLEANING BOTTLES, JARS OR SIMILAR CONTAINERS; LIQUID HANDLING
- B67D—DISPENSING, DELIVERING OR TRANSFERRING LIQUIDS, NOT OTHERWISE PROVIDED FOR
- B67D7/00—Apparatus or devices for transferring liquids from bulk storage containers or reservoirs into vehicles or into portable containers, e.g. for retail sale purposes
- B67D7/06—Details or accessories
- B67D7/08—Arrangements of devices for controlling, indicating, metering or registering quantity or price of liquid transferred
- B67D7/30—Arrangements of devices for controlling, indicating, metering or registering quantity or price of liquid transferred with means for predetermining quantity of liquid to be transferred
- B67D7/302—Arrangements of devices for controlling, indicating, metering or registering quantity or price of liquid transferred with means for predetermining quantity of liquid to be transferred using electrical or electro-mechanical means
- B67D7/303—Arrangements of devices for controlling, indicating, metering or registering quantity or price of liquid transferred with means for predetermining quantity of liquid to be transferred using electrical or electro-mechanical means involving digital counting
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Mathematical Physics (AREA)
- Theoretical Computer Science (AREA)
- Mechanical Engineering (AREA)
- Loading And Unloading Of Fuel Tanks Or Ships (AREA)
- Vehicle Cleaning, Maintenance, Repair, Refitting, And Outriggers (AREA)
Abstract
A fuel supplying system comprises a fill-up device 30 for filling a fuel supplying hose 20 with fuel upon completion of a fuel supplying operation performed in a specific fuel supplying mode in which a supply of fuel is stopped by a fuel supply stopping mechanism 18, 15 other than a fuel supplying nozzle 21, a memory for storing as a correcting quantity a quantity of fuel supplied to fill the fuel supplying hose by the fill-up device, and a correcting circuit for obtaining a corrected fuel supplying quantity by subtracting the correcting quantity which is read out from the memory from a desired quantity of fuel to be supplied in the specific fuel supplying mode and for stopping the supply of fuel by operating the fuel supply stopping mechanism when the quantity of supplied fuel reaches the corrected fuel supplying quantity. <IMAGE>
Description
SPECIFICATION
Fuel supplying system
The present invention generally relates to fuel supplying systems, and more particularly to a fuel supplying system for a fuel supplying apparatus having a plurality of fuel supplying modes, for supplying during a predetermined fuel supplying mode an accurate quantity of fuel regardless of a fuel supplying mode of a previously performed fuel supplying operation.
Conventionally, there is a fuel supplying apparatus capable of performing a preset fuel supplying operation. According to this fuel supplying apparatus, a desired fuel supplying quantity or price is preset, and a preset fuel supplying operation is performed to supply fuel corresponding to the preset fuel supplying quantity or price. Generally, such a fuel supplying apparatus comprises a pump, a flowmeter, a fuel supplying nozzle, a flow quantity signal generator, an indicator, a preset switch, and fuel supply stopping means. The pump is provided at an intermediate part of a pipe arrangement which has one end thereof communicating to a tank. The fuel supplying nozzle is connected to the other end of the pipe arrangement through a fuel supplying hose.The flow quantity signal generator generates a flow quantity signal in correspondence with the quantity of fuel measured in the flowmeter. An indicator indicates the quantity of supplied fuel based on the flow quantity signal generated from the flow quantity signal generator. The preset switch is used to preset the desired fuel supplying quantity which is to be supplied in the preset fuel supplying mode. The fuel supply stopping means stops the supply of fuel from the fuel supplying nozzle when the quantity of supplied fuel reaches the preset fuel supplying quantity which has been preset by the preset switch. The fuel supply stopping means is constituted by a motor which is provided for driving the pump, or by a stop valve or the like which is provided in the pipe arrangement.
In the case of a normal fuel supplying operation, the starting and stopping of the fuel supply is performed by opening and closing a valve of the fuel supplying nozzle. On the other hand, in the case of the preset fuel supplying operation, the start of the fuel supply is performed by opening the valve of the fuel supplying nozzle, but the stopping of the fuel supply is performed by the fuel supply stopping means. In other words, the fuel supply is stopped during the preset fuel supplying operation by stopping the motor which drives the pump or by closing the stop valve provided in the pipe arrangement, for example. Further, the valve of the fuel supplying nozzle is operated and closed after the preset fuel supplying operation is completed.For this reason, the valve of the fuel supplying nozzle remains open even when the fuel supply stopping means stops the fuel supply during the preset fuel supplying operation, and a part of the fuel within the hose and withing the pipe arrangement between the fuel supply stopping means and the fuel supplying nozzle will flow into a fuel tank of a vehicle. The quantity of fuel which flows into the fuel tank of the vehicle in this manner after the actual preset fuel supplying operation is completed, depends on the length of the pipe arrangement and the hose, and differs for eachfuel supplying station. Normally, this quantity of fuel is in the range of 0.1 liters to 0.5 liters.For example, in the case where the mode with which the fuel supplying operation is to be performed differs between two successive fuel supplying operations, such as the case where a previous fuel supplying operation is performed in the preset fuel supplying mode and the fuel supplying operation is now to be performed in the normal fuel supplying mode, a small error is introduced in the actual quantity of fuel which is supplied.
In other words, in the case where the fuel supplying operation is performed in the normal fuel supplying mode for two successive fuel supplying operations, the quantity of fuel supplied during one fuel supplying operation is equal to the quantity of fuel supplied from a time when the valve of the fuel supplying nozzle is opened up to a time when the valve of the fuel supplying nozzle is closed, and the actual quantities of supplied fuel indicated on the indicator are the same for the two successive fuel supplying operations.On the other hand, when the previous fuel supplying operation is performed in the preset fuel supplying mode and the fuel supplying operation is now to be performed in the normal fuel supplying mode, the quantity of fuel which is required to fill a part of the pipe arrangement and the hose which become empty at the time when the previous preset fuel supplying operation is completed, by driving the pump when starting the fuel supplying operation in the normal fuel supplying mode, will be measured in the flowmeter before the valve of the fuel supplying nozzle is opened to perform the normal fuel supplying operation.Accordingly, the actual quantity of fuel which is supplied from the time when the valve of the fuel supplying nozzle is opened up to the time when the valve of the fuel supplying nozzle is closed, is less than the quantity indicated on the indicator by the quantity of fuel which is required to fill the empty part of the pipe arrangement and the hose at the start of the fuel supplying operation in the normal fuel supplying mode.
In the case where the fuel supplying operation is performed in the preset fuel supplying mode for two successive fuel supplying operations, the quantity of fuel required to fill the empty part of the pipe arrangement and the hose at the start of the latter of the two successive fuel supplying operations is the same as the quantity of fuel which flows out of the fuel supplying nozzle at the completion of this latter fuel supplying operation. In other words, the quantity of fuel which is actually supplied, coincides with the quantity of supplied fuel which is indicated on the indicator.On the other hand, when the previous fuel supplying operation is performed in the normal fuel supplying mode and the fuel supplying operation is now to be performed in the preset fuel supplying mode, the actual quantity of fuel which is supplied from the time when the valve of the fuel supplying nozzle is opened up to the time when the fuel supply stopping means is operated and the valve of the fuel supplying nozzle is thereafter closed, is more than the quantity indicated on the indicator by the quantity of fuel which flows out of a part of the pipe arrangement and the hose at the completion of the fuel supplying operation in the preset fuel supplying mode.
Similar problems occur in a fuel supplying apparatus capable of performing an integral quantity fuel supplying operation. Such a fuel supplying apparatus capable of performing the integral fuel supplying operation has a construction which is basically the same as that of the fuel supplying apparatus described before capable of performing the preset fuel supplying operation, but an integral quantity designating switch is provided instead of the preset switch. When the integral quantity designating switch is provided instead of the preset switch.
When the integral quantity designating switch is manipulated during a fuel supplying operation, the fuel supply stopping means is operated so that the fuel supplying operation ends at a time when the quantity (or price) of supplied fuel reaches an integral quantity (or price). For example, this integral quantity (or price) is closest to and is greater than the quantity of supplied fuel at the time when the integral quantity designating switch is manipulated.
Accordingly, in the case where the previous fuel supplying operation is performed in the integral quantity fuel supplying mode and the fuel supplying operation is now to be performed in the normal fuel supplying mode, the quantity of fuel which is required to fill a part of the pipe arrangement and the hose which become empty at the time when the previous preset fuel supplying operation is completed, by driving the pump when starting the fuel supplying operation in the normal fuel supplying mode, will be measured in the flowmeter before the valve of the fuel supplying nozzle is opened to perform the normal fuel supplying operation.
Accordingly, the actual quantity of fuel which is supplied from the time when the valve of the fuel supplying nozzle is opened up to the time when the valve of the fuel supplying nozzle is closed, is less than the quantity indicated on the indicator by the quantity of fuel which is required to fill the empty part of the pipe arrangement and the hose at the start of the fuel supplying operation in the normal fuel supplying mode.
Hence, when performing a predetermined fuel supplying operation in a fuel supplying apparatus having a plurality of fuel supplying modes, there is a problem in that it is impossible to supply an accurate quantity of fuel when the method used to stop the fuel supply during the previous fuel supplying operation differs from that used in the fuel supplying operation which is performed thereafter. For example, such a problem occurs when the fuel supply stopping means is used to stop the supply of fuel in the previous fuel supplying operation and the valve of the fuel supplying nozzle is used to stop the supply of fuel in the fuel supplying operation which is performed thereafter.
Accordingly, it is a general object of the present invention to provide a novel and useful fuel supplying system in which the problems described heretofore are eliminated.
The present invention provides a fuel supplying system for a fuel supplying apparatus comprising a fuel supplying nozzle provided on one end of a fuel supplying hose, a pipe arrangement having one end thereof coupled to a tank and another end thereof coupled to another end of the fuel supplying hose, a pump provided in the pipe arrangement for supplying fuel from the tank to the fuel supplying hose, a motor for driving the pump, flow quantity signal generating means for measuring a flow quantity of fuel supplied by the pump and for generating a flow quantity signal proportional to the measured flow quantity, counting means for counting the flow quantity signal so as to obtain a quantity of supplied fuel, switch means for selecting one fuel supplying mode out of a plurality of fuel supplying modes, and fuel supply stopping means for stopping the supply of fuel when the quantity of supplied fuel obtained in the counting means reaches a desired fuel supplying quantity during a specific fuel supplying mode, said fuel supplying system comprising, fill-up means for filling the fuel supplying hose with fuel when a fuel supplying operation performed in said specific fuel supplying mode is completed, said counting means obtaining a quantity of fuel supplied to fill the fuel supplying hose by said fill-up means, memory means for storing as a correcting quantity said quantity of fuel supplied to fill the fuel supplying hose by said fill-up means, and correcting means for obtaining a corrected fuel supplying quantity by subtracting said correcting quantity which is read out from said memory means from the desired quantity of fuel to be supplied in said specific fuel supplying mode, and for stopping the supply of fuel by operating said fuel supply stopping means when the quantity of supplied fuel reaches the corrected fuel supplying quantity.
According to the fuel supplying system of the present invention, it is possible to supply an accurate quantity of fuel regardless of the fuel supplying mode of a previously performed fuel supplying operation.
Other objects and further features of the present invention will be apparent from the following detailed description when read in conjuction with the accompanying drawings.
Figures lA, 1B, IC, and 10 respectively show relationships between an actual quantity of supplied fuel and a quantity of fuel indicated on an indicator in a conventional fuel supplying system, for different combinations of fuel supplying modes of two suc cessivefuel supplying operations;
Figure 2 shows an example of a fuel supplying apparatus which may be applied with the fuel supplying system according to the present invention;
Figure 3 is a general system block diagram showning an embodiment of a control device in the fuel supplying system according to the present invention;
Figure 4A through 4C are flow charts for explaining an embodiment of the operation of a processing unit within the control device shown in Figure 3;;
Figure 5A through 5F are time charts for explaining a preset fuel supplying operation;
Figure 6 is a flow chart for explaining another embodiment of the operation of the processing unit within the control device shown in Figure 3; and
Figure 7 is a flow chart for explaining an integral quantity fuel supplying operation.
As described before, a fuel supplying operation in a normal fuel supplying mode is completed by closing a valve of a fuel supplying nozzle. Accordingly, in the case where a first of two successive fuel supplying operations is performed in the normal fuel supplying mode, the fuel remains within a fuel supplying hose. For this reason, in the case where the latter of the two successive fuel supplying operations is also performed in the normal fuel supplying mode, the fuel will not flow through a flowmeter even when a pump is driven at a time T1 as shown in Figure 1A, and the supply of fuel is started immediately at a time T2 when the valve of the fuel supplying nozzle is opened.As a result, an actual quantity of fuel which is supplied from the fuel supplying nozzle between times T2 and T3 is equal to a quantity of fuel which flows through the flowmeter and is indicated on an indicator, and no error is introduced between the two quantities.
However, a fuel supplying operation in a preset fuel supplying mode or an integral quantity fuel supplying mode is completed by stopping the drive of the pump, for example, in a state where the valve of the fuel supplying nozzle is open. Hence, in the case where the first of two successive fuel supplying operations is performed in the preset fuel supplying mode, the fuel supplying hose is empty because the fuel within the fuel supplying hose flows out through the fuel supplying nozzle when the first fuel supplying operation is completed. The valve of the fuel supplying nozzle is closed after the first fuel supplying operation is completed.Consequently, in the case where the latter of the two successive fuel supplying operations is performed in the normal fuel supplying mode and the pump is driven at the time
T1, the fuel flows through the flowmeter until a time T4 when the fuel supplying hose becomes filled by the fuel as shown in Figure 1 B. In other words, the quantity of fuel which flows between the times T1 and T4 is measured in the flowmeter. As a result, when the valve of the fuel supplying nozzle is opened at the time T2 so as to start the latter fuel supplying operation in the normal fuel supplying mode, a quantity of fuel described in conjuction with
Figure 1Awill be reached at a time T5 which is prior to the time T3, since the fuel within the fuel supplying hose is supplied between the times T1 and
T4.Therefore, even when the quantity of supplied fuel indicated on the indicator is equal to the quantity of supplied fuel shown in Figure 1A, the actual quantity of supplied fuel is equal to the quantity of fuel which is supplied between the times
T2 and T5 and is less than the quantity of supplied fuel shown in Figure 1A.
In the case where the two successive fuel supplying operations are performed in the preset fuel supplying mode and the latter of the two successive fuel supplying operations is started by driving the pump at the time T1 ,the fuel flows through the flowmeter up to the time T4 as shown in Figure 1C.
However, when the pump is stopped at the time T5 so as to stop the fuel supplying operation in the preset fuel supplying mode, the fuel within the fuel supplying hose flows out of the fuel supplying nozzle up to a time T3. As a result, the actual quantity of supplied fuel is equal to the quantity of supplied fuel indicated on the indicator.
Further, in the case where the first of two successive fuel supplying operations is performed in the normal fuel supplying mode and the latter of the two successive fuel supplying operations is performed in the preset fuel supplying mode and the pump is driven at the time T1 the fuel does not flow through the flowmeter. However, when th pump is stopped at the time T3, the fuel within the fuel supplying hose flows out of the fuel supplying nozzle up to a time T6 as shwn in Figure 1 D. As a result, the quantity of supplied fuel indicatted on the indicator is the quantity of fuel supplied between the times T2 and
T3, however, the actual quantity of supplied fuel is the quantity of fuel supplied between the times T2 and T6. In other words, the actual quantity of supplied fuel in this case is greater than the quantity of supplied fuel indicated on the indicator.
The present invention eliminates the problems of the conventional fuel supplying system, that is, prevents differences from occurring between the actual quantity of supplied fuel and the quantity of supplied fuel indicated on the indicator, regardless of the combination of the fuel supplying modes of the two successive fuel supplying operations.
An example of a fuel supplying apparatus which may be applied with the fuel supplying system according to the present invention is shown in
Figure 2.
In Figure 2, a fixed type fuel supplying apparatus 11 generally comprises a lower case 12 and an upper case 13. A pipe arrangement 14 having one end coupled to a tank (not shown) is provided within the lower case 12. A pump 16 which is driven buy a motor 15, a flowmeter 17 for measuring the quantity of supplied fuel, and an opening and closing solenoid valve 18 are respectively provided in the pipe arrangement 14. As will be described later on in the specification, the valve 18 comprises a main solenoid valve 18A for permitting a large quantity of fuel to pass in an open state thereof, and an auxiliary solenoid valve 18B for permitting a small quantity of fuel to pass in an open state thereof. A flow quantity signal generator 19 is provided on the flowmeter 17 for generating a flow quantity signal which is proportional to the quantity of fuel measured by the flowmeter 17. Afuel supplying hose (hereinafter simply referred to as a hose) 20 is coupled to the other end of the pipe arrangement 14, and a fuel supplying nozzle (hereinafter simply referred to as a nozzle) 21 is mounted on a tip end of the hose 20.
Other than the time when the fuel supplying operation is performed, the nozzle 21 is accommodated in a nozzle accomodating part (hereinafter simply referred to as an accommodating part) 22. A switch 23 is provided in the accommodating part 22, and this switch 23 is closed (turned ON) when the nozzle 21 is removed from the accommodating part 22 and is opened (turned OFF) when the nozzle 21 is accommodated in the accommodating part 22. The motor 15 starts ts rotate and the valve 18 opens when the switch 23 closes On the other hand, the motor 15 stops rotating when the switch 23 opens.
An indicator 24 is provided on a front of the upper case 13. An indicator part 25 for indicating the price of supplied fuel, an indicator part 26 for indicating the quantity of supplied fuel, and an indicator part 27 for indicating the unit price of fuel are provided in the indicator 24. A preset switch 28 constituting
presetting means is provided on a side surface of the
upper case 13. The preset switch 28 comprises
buttons 28A, 288, 28C, 28D, and 28E for respectively
presetting the quantity of fuel to be supplied to 10,
15,20,30, and 40 liters of fuel, for example. A unit
price setting part 29 for setting the unit price of fuel and a control device 30 which will be described later
in conjuction with Figure 3 are built within the upper case 13.The buttons 28Athrough 28E of the preset switch 28 may be designed for respectively preset -ting the price of fuel to be supplied to 1,000, 1,500, 2,000,3,000, and 4,000 Yens, for example, instead of
presetting the quantity of fuel to be supplied.
Further, instead of providing the buttons 28A through 28E, the preset switch 28 may employ a dial or a ten-key. Furthermore, the preset switch 28 may employ a card reader four reading a quantity or price of fuel to be supplied from a card. The location of the
presetting means is not limited to the side surface of the upper case 13, but the presetting means may be
provided in an office within the fuel supplying station or any other convenient location in the fuel supplying station.
Next, description will be given with respect to an
embodiment of the control device 30 by referring to
Figure 3. The control device 30 generally comprises a processing unit (for example, a central processing
unit) 31, a read only memory (ROM) 32, a random
access memory (RAM) 33, an indicator control circuit 34, and input/output circuit 35, a motor driving circuit 36, and a solenoid valve control circuit
(hereinafter simply referred to as a valve control circuit) 37. The ROM 32 stores programs for perform
ing steps shown in Figures 4A through 4C. The RAM 33 stores a preset quantity, an actual quantity of supplied fuel, and a correcting quantity which will be described later under a control of the processing unit 31. The indicator control circuit 34 controls the
indications of the quantity of supplied fuel and the
like on the indicator parts 25 through 27 of the indicator 24.The motor driving circuit 36 is coupled to an output side of the input/output circuit 35 and drives the motor 15 underthe control of the processing unit 31. | The valve control circuit 37 is coupled to the output side of the inputloutput circuit 35 and determines the open and closed states of the
main and auxiliary valves 1 8A and 18B. The processing unit 31, the ROM 32, the RAM 33, the indicator control circuit 34, the inputloutput circuit 35 and the
like are coupled to each other by way of a data bus 38. An output of the flow quantity signal generator
19 is coupled to an interrupt terminal int of the
processing unit 31, and the processing unit 31 counts the flow quantity signal based on the flow chart shown in Figure 4C as will be described later.
The nozzle switch 23 and the preset switch 28 are respectively coupled to an input side of the inputs output circuit 35, and the outputs of these switches 23 land 28 are entered into the processing unit 31 via the input/output circuit 35.
First, description will be given with respect to the fuel supplying operation performed in the normal fuel supplying mode in which the preset switch 28 is not manipulated.
When the nozzle 21 is removed from the accommodating part 22, the nozzle switch 23 closes and the output signal thereof indicating the closure of the nozzle switch 23 is entered into the processing unit 31 via the input/output circuit 35. As a result, the processing unit 31 supplies a motor start signal to the motor driving circuit 36 so as to start the motor 15. In addition, the processing unit supplies a valve opening signal to the valve control circuit 37 so as to open the main and auxiliary valves 1 8A and 18B.
Furthermore, the processing unit 31 supplies a reset signal to the RAM 33 and resets a counting area
PCOUNT within the RAM 33. Thus, previous indications on the indicator parts 25 and 26 are reset to zero via the indicator control circuit 34. When the nozzle 21 is inserted into a fuel tank (not shown) of a vehicle (not shown) and the valve of the nozzle 21 is opened in this state, the fuel from the tank (not shown) is passed through the pipe arrangement 14, the pump 16, the flowmeter 17, the valve 18, and the hose 20, and is ejected from the nozzle 21.The flow quantity of the supplied fuel is measured by the flowmeter 17, and the flow quantity signal from the flow quantity signal generator 19 is supplied to the processing unit 31.The processing unit 31 performs an interrupt routine (steps S25 through S27) shown in Figure 4C to count the flow quantity signal in the counting are PCOUNTwithin the RAM 33. A counted signal (value) from the counting area PCOUNT within the RAM 33 is supplied to the indicator control circuit 34 and is converted into a signal format suited for the indicator 24 in accordance with the binary coded decimal system.This converted signal is passed through an indicator driving circuit (not shown and within the indicator control circuit 34, for example) and is supplied to the indicator parts 25 and 26 of the indicator 24 to successively indicate the quantity and price of supplied fuel.
When the quantity of supplied fuel reaches a desired fuel supplying quantity, the nozzle 21 is accomodated in the accommodating part 22 and the nozzle switch 23 is opened. The processing unit 31 supplies a motor stop signal to the motor driving circuit 36 so as to stop the motor 15. In addition, the processing unit 31 supplies a valve closing signal to the valve control circuit 37 so as to close the main and auxiliary valves 18Aand 18B.
The fuel supplying operation in the normal fuel supplying mode is completed in the manner described heretofore, and the described operations are essentially the same as those of the conventional fuel supplying system.
Next, description will be given with respect to the fuel supplying operation performed in the preset fuel supplying mode in which the preset switch 28 is manipulated.
First, before starting the actual fuel supplying operation, a desired quantity of fuel to be supplied (preset quantity) is preset by manipulating the preset switch 28. When a customer desires 20 liters of fuel to be supplied, for example, the button 28C is pushed. Hence, the operation of the processing unit 31 is started in a step SO shown in Figure 4A, and a step S1 stores a preset quantity P which is preset by the preset switch 28 into a preset quantity storing area PRESET within the RAM 33 via the input/output circuit 35.
A subsequent step S2 resets the previous quantity of supplied fuel stored in the counting area PCOUNT within the RAM 33, resets the indications on the indicator parts 25 and 26 to zero, sets into a first storing area V1 STOP within the RAM 33 for storing closing information of the main valve 18A a value X (= P-A) which is obtained by subtracting a constant value A from the preset quantity P within the preset quantity storing area PRESET, and sets into a second storing area V2STOP within the RAM 33 for storing closing information of the auxiliary valve 188 a value
Y (= P-B-C) which is obtained by subtracting a constant value B and a correcting value (quantity) C stored in a correcting value storing area ADDPLS within the RAM 33 from the preset quantity P.The valve 18 is closed in two stages in order to improve the measuring accuracy, and the main valve 18A is closed in a first valve closing stage while the auxiliary valve 18B is closed in a second valve closing stage. The value A is selected to several liters, for example, so that several liters of fuel flow from the time when the main valve 18A is closed in the first valve closing stage until the time when the auxiliary valve 18B is closed in the second valve closing stage. The value B is an overflow quantity of fuel which flows when the auxiliary valve 18B is closed, and is normally selected in the range of 0.1 liter to 0.3 liter, for example.The correcting quantity
C is the quantity of fuel required to fill the hose 20 after completion of the previous fuel supplying operation in the preset fuel supplying mode, and is a variable which is in the range of 0.1 liter to 0.5 liter, for example.
When the preset quantity is preset in the above described manner, the nozzle 21 is removed from the accommodating part 22 as in the case of the fuel supplying operation in the normal fuel supplying mode described before. Hence, the nozzle switch 23 closes and the output signal thereof indicating the closure of the nozzle switch 23 is entered into the processing unit 31 via the input/output circuit 35. As a result, the processing unit 31 supplies a motor start signal to the motor driving circuit 36 in a step S3 so as to start the motor 15. A step S4 supplies a valve opening signal to the valve control circuit 37 so as to open the main and auxiliary valves 18Aand 18B.
In this state, when the nozzle 21 is inserted into the fuel tank fo the vehicle and the valve of the nozzle 21 is opened, the fuel from the tank is ejected form the nozzle 21 and supplied to the fuel tank. The flow quantity of the supplied fuel is measured by the flowmeter 17, and the flow quantity signal from the flow quantity signal generator 19 is supplied to the interrupt terminal int of the processing unit 31. Thus, the processing unit 31 performs the interrupt routine (steps S25 though 527) shown in Figure 4C to count the flow quantity signal in the counting area PCOUNTwithin the RAM 33. The counted signal (value Q) from the counting area PCOUNTwithin the
RAM 33 is supplied via the indicator control circuit 34 to the indicator parts 25 and 26 of the indicator 24 to successively indicate the quantity and price of supplied fuel.
A step S5 discriminates whether or not the value 0 (quantity of supplied fuel) within the counting area
PCOUNT is greater than or equal to the value X (=
P-A) within the first storing area VISTOP. When the value 0 has not reached the value X and the discrimination result in the step S5 is NO, a step S6 indicates the quantity of supplied fuel (value O within the counting area PCOUNT) on the indicator 24. A step S7 discriminates whether or not the nozzle switch 23 is OFF. In the case where the nozzle 21 is accommodated in the accommodating part 22, the discrimination result in the step S7 is YES, and it is discriminated that the mode of the fuel supplying operation has been changed to the normal fuel supplying mode during the fuel supplying operation.
Hence, when the discrimination result in the step S7 is YES, a step S23 shown in Figure 48 stops the motor 15 and the fuel supply is ended in a step S24.
On the other hand, when the discrimination result in the step S7 in NO, the operation returns to the step
S5. When the value Q (quantity of supplied fuel) reaches the value X and the discrimination result in the step S5 becomes YES, a step S8 supplies a main valve closing signal to the valve control circuit 37 so as to close the main valve 18A. Hence, the large flow of fuel through the pipe arrangement 14 is reduced to a small flow of fuel.
Next, a step S9 discriminates whether or not the value 0 (quantity of supplied fuel) within the counting area PCOUNT is greater than or equal to the value Y (= P-B-C) within the second storing area
V2STOP. When the value Q has not reached the value Y and the discrimination result in the step S9 is
NO, steps S10 and S11 are performed. The steps S10 and S11 are essentially the same as the steps S6 and
S7 described before. On the other hand, when the discrimination result in the step S9 is YES, a step S12 supplies an auxiliary valve closing signal to the valve control circuit 37 so as to close the auxiliary valve 18B. As a result, the fuel supply is stopped.
After the auxiliary valve closing signal is supplied to the valve control circuit 37 in the step S12, a step
S13 performs an addition by adding the correcting quantity C stored within the correcting value storing area ADDPLS in the previous fuel supplying operation in the presetfuel supplying mode to the value Q (quantity of supplied fuel) and the added value is stored int the counting area PCOUNT. As described before in conjuction with Figure 1 D, in the preset fuel supplying mode, the fuel in the hose 20 and the pipe arrangement 14flows in excess even after the auxiliary valve 188 is closed, and the fuel supplied in excess must be taken into account in order to measure an accurate quantity of supplied fuel. This is the reason why the addition is performed in the step S13.A step S14 shown in Figure 4B indicates on the indicator parts 25 and 26 the added value in the counting area PCOUNT. Figure 5A shows the flow quantity characteristic of the fuel supplying operation in the preset fuel supplying mode, and the above added value corresponds to a part a indicated by the hatchings. Therefore, the desired preset quantity P of fuel is supplied with a high accuracy.
Next, when the operator accommodates the nozzle 21 in the accommodating part 22, the nozzle switch 23 opens and the output signal thereof indicating the opening of the nozzle switch 23 is entered into the processing unit 31 via the input/output circuit 35. A step 515 discriminates whether or not the nozzle switch 23 is OFF, that is, the nozzle 21 has been accommodated in the accommodating part 22.
When the discrimination result in the step S15 is
YES, a step S16 resets the value 0 within the counting area PCOUNTto zero in order to measure the quantity of fuel required to fill the hose 20.
However, the quantity of supplied fuel is stored in an independently provided buffer (not shown) so that the indications on the indicator parts 25 and 26 are maintained and not reset to zero until the next fuel supplying operation is performed, In the preset fuel supplying mode, the motor 15 continues to rotate for a time t1 even after the nozzle switch 23 opens, as may be seen from Figures 5B and 5C. Figure 5B shows the opening and closing timing of the nozzle switch 23, and Figure 5C shows the start and stop timing of the motor 15. Figure 5D shows the opening and closing timing of the main valve 18A.
In this state, a step S17 supplies an auxiliary valve opening signal to the valve control circuit 37 for a predetermined short time t2 so as to open the
auxiliary valve 18B forthetime t2 as shown in Figure
5E. Figure 5E shows the opening and closing timing
of the auxiliary valve 18B. The time t2 is selected to
such a value that the fuel fills the hose 20 after the fuel in the hose 20 flows out in the preset fuel
supplying mode. For example, the time t2 is normal
ly selected to a value in the range of 0.5 second to 1.0
second so that the fuel fills the hose 20 to such an
extent that the hose 20 is in an expanded state. As
the fuel is supplied to the pipe arrangement 14 and
the hose 20 so as to fill the hose 20, the quantity of
supplied fuel is measured by the flowmeter 17.
Hence, the flow quantity signal from the flow
quantity signal generator 19 is supplied to the
processing unit 31 and the flow quantity signal is
counted in the counting area PCOUNTwithin the
RAM 33.
In the preset fuel supplying mode, the valve 18
closes automatically when the quantity of supplied fuel reaches the preset quantity. Forthis reason,
unlike in the case of the normal fuel supplying mode
in which the operator starts and stops the fuel supply
by opening and closing the valve of the nozzle 21,
when the fuel supplying operation in the preset fuel
supplying mode is completed, the operator may
accommodate the nozzle 21 in the accommodating
part 22 without noticing that the valve of the nozzle
21 remains open.When the nozzle 21 is accommo
dated in the accommodating part 22 in the state where the valve of the nozzle is open and the nozzle 21 is removed from the accomodating part 22 to start the next fuel supplying operation, the pump 16 is driven by the closing of the nozzle switch 23 and there is a danger in that the fuel may be ejected from the nozzle 21 at the instant when the nozzle 21 is removed from the accommodating part 22. For this reason, as a safety check operation, the processing unit 31 discriminates whether or not the nozzle 21 is closed afterthefuel supplying operation in the preset fuel supplying mode is completed.In other words, a step S18 discriminates whether or not a quantity of fuel supplied while the auxiliary valve 1 8B is open for the time t2 (value Q in the counting area PCOUNT) is smaller than a predetermined value
K. Since the quantity of fuel supplied during the time t2 while the auxiliary valve 1 8B is open in the range of 0.1 liter to 0.5 liter, it will be sufficient to set the predetermined value K to 1.0 liter, for example.
When the discrimination result in the step S18 is NO, a step S19 supplies an error indication signal to the indicator control circuit 34 so as to make the indications on the indicator parts 25 and 26 blink, so that the operator is warned of the open state of the valve of the nozzle 21. Instead of making the indications blink, it is possible to drive a warning buzzer or a speech synthesis device for giving a warning by speech through a speaker. A step S20 discriminates whether or not the nozzle switch 23 is
OFF. Hence, the indications on the indicator parts 25 and 26 continue to blink until the valve of the nozzle 21 is closed and the nozzle 21 is accommodated in the accommodating part 22 because the discrimination result in the step S20 will be NO.When the discrimination result in the step S20 becomes YES, a step S21 stops the supply of the error indication signal so as to stop the indications on the indicator parts 25 and 26 from blinking. After the step 521, the operation returns to the step S16 so as to repeat the steps S16 through S18. Accordingly, a loop constituted by the steps S18 through S21 performs the safety check to determine whether or not the valve of the nozzle 21 remains open after the competion of the fuel supplying operation in the preset fuel supplying mode. Figure 5 Fshowstheopening and closing timing of the valve of the nozzle 21.
When the discrimination result in the step S18 is
YES, a step S22 transfers the value 0 within the counting area PCOUNTto the correcting quantity storing area ADDPLS and stores the value Q in the correcting quantity storing area ADDPLS as the correcting quantity C. This correcting quantity C which is stored in the correcting quantity storing area ADDPLS is used as the corredting quantity C in the step S2 shown in Figure 4A during a fuel supplying operation which is next performed in the
preset fuel supplying mode, regardless of how many times the fuel supplying operation is performed in the normal fuel supplying mode between the two fuel supplying operations in the preset fuel sup
plying mode. The correcting quantity C corresponds to a part b indicated by the hatchings in Figure 5A.
When the storing of the correcting quantity C is
completed, a step S23 supplies a motor stop signal to the motor driving circuit 36 so as to stop the motor 15, and the fuel supplying operation in the preset fuel supplying mode is ended in a step S24.
In the embodiment described heretofore, the steps S16 and 517 constitute fill-up means for supplying fuel so that the hose 20 is filled, and the steps 518 and S22 constitute memory means for storing the correcting quantity C. The step S2 constitutes correcting means for correcting the preset quantity P which is preset by the preset switch 28 by subtracting the correcting quantity C from the preset quantity P. The steps S18 through S21 constitute detecting means for detecting whether or not the valve of the nozzle 21 is closed after the fuel supplying operation in the preset fuel supplying mode is completed.
Next, description will be given with respect to another embodiment of the operation of the processing unit 31 by referring to Figure 6. The present embodiment is characterized in that the fuel supply stopping means used in the preset fuel supplying mode is constituted by the motor 15 instead of the valve 18. In other words, when the fuel supply stopping means is operated, the motor 15 stops so as to stop the fuel supply. Accordingly, in the present embodiment, it is unnecessary to provide the main and auxiliary valves 18A and 18B in the pipe arrangement 14, and the fuel supply is stopped in one stage instead of two stages.
In Figure 6, the operation of the processing unit 31 is started in a step S29, and a step S30 stores the preset quantity P in the preset quantity storing area
PRESET within the RAM 33. A step S31 resets the previous quantity of supplied fuel stored in the counting area PCOU NT within the RAM 33, and sets into a storing area MSTOP within the RAM 33 for storing stopping information of the motor 15 a value
Z (= P-D-C) which is obtained by subtracting a constant value D and the correcting quantity C stored within the correcting value storing area
ADDPLS from the preset quantity P. The value D corresponds to a quantity of fuel which is supplied by to the rotation of the motor 15 due to the inertia thereof after the driving of the motor 15 is stopped.
Next, a step S32 supplies a motor start signal to the motor driving circuit 36 so as to start the motor 15.
Steps S33 through S35 similar to the steps S5 through S7 described before are performed, and a step S36 supplies a motor stop signal to the motor driving circuit 36 to stop the motor 15 when the step S33 discriminates that the value Q (quantity of supplied fuel) is greater than or equal to the value Z stored in the storing area MSTOP. Steps 537 through
S40 similar to the steps S13 through S16 described before are then performed, and a step S41 supplies a motor start signal to the motor driving circuit 36 for a predetermined short time t3 so as to rotate the motor 15 for the time t3 and fill the hose 20 with fuel.
Thereafter, steps S42 through S47 similar to the steps S18 through S22 and S24 are performed. The remaining operation is essentially the same as that of the previously described embodiment, and description thereof will be omitted.
In the embodiment described heretofore, the hose is filled with the fuel after the fuel supplying operation in the preset fuel supplying mode is completed, and the quantity of fuel required to fill the hose in the previous feul supplying operation is used as the correcting quantity and is subtracted from the preset quantity for the next fuel supplying operation performed in the preset fuel supplying mode. Hence, an accurate quantity of fuel is supplied during the fuel supplying operation regardless of the modes of the two successive fuel supplying operations.
Next, description will be given with respect to the case where the fuel supplying system according to the present invention is applied to a fuel supplying apparatus capable of performing the fuel supplying operation in an integral quantity fuel supplying mode. A control device which is basically the same as the control device 30 shown in Figure 3 may be used for the fuel supplying apparatus having the integral quantity fuel supplying mode, however, a switch 40 indicated by a phantom line in Figure 3 is provided instead of (or in addition to) the preset switch 28. The switch 40 is manipulated when the mode of the fuel supplying apparatus is to be set to the integral quantity fuel supplying mode. For example, the switch 40 is provided in a vicinity of the nozzle 21.When the switch 40 is manipulated during a fuel supplying operation, the processing unit 31 enters an output of the switch 40 via the input/output circuit 35. The processing unit 31 supplies a signal for operating the fuel supply stopping means responsive to the output of the switch 40 at a time when the quantity of supplied fuel reaches an integral quantity (or an integral price) which is closest to, for example, and is greater than the quantity (or price) of supplied fuel at the time when the switch 40 is manipulated.
Figure 7 shows an embodiment of the operation of the processing unit 31 when the motor 15 is used as the fuel supply stopping means. The operation of the processing unit 31 is started in a step S50, and a step S51 resets the previous quantity of supplied fuel stored in the counting area PCOUNT within the RAM 33. A step S52 supplies a motor start signal to the motor driving circuit 36 so as to start the motor 15. A step S53 discriminates whether or not the switch 40 has been manipulated (turned ON), and the operation advances to a step S54 when the discrimination result in the step S53 becomes YES.The step S54 rounds the quantity of supplied fuel (value Q) at the time when the switch 40 is manipulated to an integral quantity 01 which is greater than the value
Q. A step S55 sets into an integral quantity storing area INT within the RAM 33 for storing the integral quantity which is to be supplied a value I Ql-D-C) which is obtained by subtracting the constant value D and the correcting quantity C stored within the correcting value storing area
ADDPLS from the integral quantity Q. A step S56 discriminates whether or not the quantity of supplied fuel (value O) is greater than or equal to the integral quantity I. When the discrimination result in the step S56 is NO, the operation advances to steps (not shown) which are similar to the steps S34 and the like shown in Figure 6. On the other hand, whenthe discrimination result in the step S56 is YES, the operation advances to steps (not shown) which are similar to the steps S36 and the like shown in
Figure 6 so as to stop the motor 15. The operation performed after the step S56 es essentially the same as that described in conjuction with Figure 6, and illustration and description thereof will be omitted.
In the embodiment shown in Figure 7, the motor 15 is used as the fuel supply stopping means.
However, as in the case of the embodiment shown in
Figures 4A through 4C, it is of course possible to use the valve 18 as the fuel supply stopping means.
However, description for the case where the valve 18 is used as the fuel supply stopping means in the fuel supplying apparatus having the integral quantity fuel supplying mode will be omitted, since those skilled in the art would be able to understand the operation in this case from the description of Figures 4Athrough 4C.
In the embodiment shown in Figure 7, the hose is filled with the fuel after the fuel supplying operation in the integral quantity fuel supplying mode is completed, and the quantity offuel required to fill the hose in the previous fuel supplying operation is used as the correcting quantity and is subtracted from the desired integral fuel supplying quantity for the next fuel supplying operation performed in the integral quantity fuel supplying mode. Hence, an accurate quantity of fuel is supplied during the fuel supplying operation regardless of the modes of the two successive fuel supplying operations.
In each of the embodiments described heretofore, the fuel supplying system according to the present invention is applied to the fixed type fuel supplying apparatus. However, the fuel supplying apparatus is not limited to the fixed type, and may be a hanging type fuel supplying apparatus in which the nozzle is provided on the tip end of a hose which hangs from a high part of the fuel supplying station. In such hanging type fuel supplying apparatus, the hose is paid out and taken up by an elevator mechanism so that the nozzle takes a fuel supplying position suited for supplying fuel to the vehicle and a rest postion which does not interfere with the vehicle which enters and leaves the fuel supplying station. Further, an elevator switch is provided to operate the elevator mechanism and move the nozzle between the fuel supplying position and the rest position. When the fuel supplying system according to the present invention is applied to the hanging type fuel supplying apparatus, the elevator switch may be used instead of the nozzle switch in order to detect the open and closed states of the valve of the nozzle.
In addition, in each of the embodiments described heretofore, the detecting means is provided in order to detect the open and closed states of the valve of the nozzle 21. However, it is possible to omit the detecting means in the case where a mechanism is provided on the nozzle 21 so that the valve of the nozzle is closed automatically when the nozzle 21 is accommodated in the accommodating part 22.
Further, the present invention is not limited to these embodiments, but various variations and modifications may be made without departing from the scope of the present invention.
Claims (7)
1. A fuel supplying system for a fuel supplying apparatus comprising a fuel supplying nozzle provided on one end of a fuel supplying hqser a pipe arrangement having one end thereof coupled to a tank and another end thereof coupled to another end of the fuel supplying hose, a pump provided in the pipe arrangement for supplying fuel from the tank to the fuel supplying hose, a motor for driving the pump, flow quantity signal generating: means for measuring a flow quantity of fuel supplied. by the pump and for generating a flow quantity, counting means for counting the flow quantity signal so as to obtain a quantity of supplied fuel, switch means for selecting one fuel supplying mode out of a plurality of fuel supplying modes, and fuel supply stopping means for stopping the supply of fuel when the quantity of supplied fuel obtained in the counting means reaches a desired fuel supplying quantity during a specific fuel supplying mode, said fuel supplying system comprising: fill-up means for filling the fuel supplying hose with fuel when a fuel supplying operation performed in said specific fuel supplying mode is completed, said counting means obtaining a quantity of fuel supplied to fill the fuel supplying hose by said fill-up means; memory means for storing as a correcting quantity said quantity of fuel supplied to fill the fuel supplying hose by said fill-up means; and correcting means for obtaining a corrected fuel supplying quantity by subtracting said correcting quantity which is read out from said memory means from the desired quantity of fuel to be supplied in said specific fuel supplying mode, and for stopping the supply of fuel by operating siad fuel supply stopping means when the quantity of supplied fuel reaches the corrected fuel supplying quantity.
2. Afuel supplying system as claimed in claim 1 in which said switch means comprises a preset switch for presetting as said desired fuel supplying quantity a preset quantity of fuel to be supplied, said specific fuel supplying mode being a preset fuel supplying mode in which the preset quantity of fuel preset by said preset switch is supplied during the fuel supplying operation.
3. Afuel supplying system as claimed in claim 1 in which said switch means comprises a designating switch for operating said fuel supply stopping means when said designated switch is manipulated and the quantity of supplied fuel obtained in said counting means reaches an integral quantity, said specific fuel supplying mode being an integral quantity fuel supplying mode in which said integral quantity of fuel is supplied as said desired fuel supplying quantity.
4. Afuel supplying system as claimed in claim 1 in which said fuel supply stopping means comprises valve means provided in said pipe arrangement, said valve means being closed when said fuel supply stopping means is operated.
5. Afuel supplying system as claimed in claim 1 in which said fuel supply stopping means comprises said motor, said motor being stopped when said fuel supply stopping means is operated.
6. A fuel supplying system as claimed in claim 1 which further comprises detecting means for detecting whether or not a valve of said fuel supplying nozzle is closed after said fuel supply stopping means is operated and for generating a detection signal when said valve is closed, said fill-up means supplying the fuel to fill the fuel supplying hose after the fuel supplying operation in said specificfuel supplying operation in said specific fuel supplying
mode is completed only when said detection signal
is generated from said detecting means.
7. A fuel supplying system substantially as
hereinbefore described with reference to the accom
panying drawings.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60024699A JPH0637235B2 (en) | 1985-02-12 | 1985-02-12 | Refueling method |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| GB8603416D0 GB8603416D0 (en) | 1986-03-19 |
| GB2170782A true GB2170782A (en) | 1986-08-13 |
| GB2170782B GB2170782B (en) | 1988-04-07 |
Family
ID=12145418
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB08603416A Expired GB2170782B (en) | 1985-02-12 | 1986-02-12 | Fuel supplying system |
Country Status (5)
| Country | Link |
|---|---|
| JP (1) | JPH0637235B2 (en) |
| CN (1) | CN1006458B (en) |
| AU (1) | AU569818B2 (en) |
| GB (1) | GB2170782B (en) |
| MY (1) | MY101951A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5433342A (en) * | 1991-12-20 | 1995-07-18 | Establissements Luro (S.A.R.L.) | Method and apparatus for supplying preset quantities of liquids |
| EP1102141A1 (en) * | 1999-11-16 | 2001-05-23 | Dresser Equipment Group, Inc. | Fluid control system and method with computer management |
| BE1019652A3 (en) * | 2010-11-24 | 2012-09-04 | Tokheim Holding Bv | METHOD FOR AUTOMATIC PREDETERMINATION OF A TARGET FUEL VOLUME TO BE DELIVERED IN THE RESERVOIR OF A MOTOR VEHICLE AND FOR OPTIMIZATION AND ADJUSTMENT OF THIS DELIVERY. |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| NZ220249A (en) * | 1987-05-08 | 1989-11-28 | Production Eng Co Ltd | Fuel dispenser housing: nozzle stowage ports situated away from respective springy masts |
| JPS63317499A (en) * | 1987-06-19 | 1988-12-26 | トキコ株式会社 | Lubricating device |
| JP2622547B2 (en) * | 1987-06-20 | 1997-06-18 | トキコ株式会社 | Refueling device |
| WO2015190006A1 (en) * | 2014-06-12 | 2015-12-17 | 株式会社タツノ | Oil supply device |
-
1985
- 1985-02-12 JP JP60024699A patent/JPH0637235B2/en not_active Expired - Lifetime
-
1986
- 1986-02-06 CN CN86101251.8A patent/CN1006458B/en not_active Expired
- 1986-02-07 AU AU53311/86A patent/AU569818B2/en not_active Ceased
- 1986-02-12 GB GB08603416A patent/GB2170782B/en not_active Expired
-
1988
- 1988-02-02 MY MYPI88000094A patent/MY101951A/en unknown
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5433342A (en) * | 1991-12-20 | 1995-07-18 | Establissements Luro (S.A.R.L.) | Method and apparatus for supplying preset quantities of liquids |
| EP1102141A1 (en) * | 1999-11-16 | 2001-05-23 | Dresser Equipment Group, Inc. | Fluid control system and method with computer management |
| BE1019652A3 (en) * | 2010-11-24 | 2012-09-04 | Tokheim Holding Bv | METHOD FOR AUTOMATIC PREDETERMINATION OF A TARGET FUEL VOLUME TO BE DELIVERED IN THE RESERVOIR OF A MOTOR VEHICLE AND FOR OPTIMIZATION AND ADJUSTMENT OF THIS DELIVERY. |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0637235B2 (en) | 1994-05-18 |
| JPS61190494A (en) | 1986-08-25 |
| CN86101251A (en) | 1986-10-15 |
| AU5331186A (en) | 1986-08-21 |
| CN1006458B (en) | 1990-01-17 |
| AU569818B2 (en) | 1988-02-18 |
| GB2170782B (en) | 1988-04-07 |
| MY101951A (en) | 1992-02-15 |
| GB8603416D0 (en) | 1986-03-19 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PCNP | Patent ceased through non-payment of renewal fee |