WO2013054704A1 - Method of filling fuel tank with dme fuel, and fuel filling system - Google Patents

Method of filling fuel tank with dme fuel, and fuel filling system Download PDF

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Publication number
WO2013054704A1
WO2013054704A1 PCT/JP2012/075597 JP2012075597W WO2013054704A1 WO 2013054704 A1 WO2013054704 A1 WO 2013054704A1 JP 2012075597 W JP2012075597 W JP 2012075597W WO 2013054704 A1 WO2013054704 A1 WO 2013054704A1
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WO
WIPO (PCT)
Prior art keywords
fuel
filling
fuel tank
liquid level
speed
Prior art date
Application number
PCT/JP2012/075597
Other languages
French (fr)
Japanese (ja)
Inventor
徳丸　武志
高瀬　繁寿
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いすゞ自動車株式会社
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Publication of WO2013054704A1 publication Critical patent/WO2013054704A1/en

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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
    • B67D7/28—Arrangements of devices for controlling, indicating, metering or registering quantity or price of liquid transferred with automatic means for reducing or intermittently interrupting flow before completion of delivery, e.g. to produce dribble feed
    • 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
    • B67D7/04—Apparatus or devices for transferring liquids from bulk storage containers or reservoirs into vehicles or into portable containers, e.g. for retail sale purposes for transferring fuels, lubricants or mixed fuels and lubricants
    • B67D7/0498—Arrangements specially adapted for transferring biofuels, e.g. ethanol-gasoline mixture
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C5/00—Methods or apparatus for filling containers with liquefied, solidified, or compressed gases under pressures
    • F17C5/02—Methods or apparatus for filling containers with liquefied, solidified, or compressed gases under pressures for filling with liquefied gases
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2250/00—Accessories; Control means; Indicating, measuring or monitoring of parameters
    • F17C2250/03—Control means
    • F17C2250/032—Control means using computers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2250/00—Accessories; Control means; Indicating, measuring or monitoring of parameters
    • F17C2250/07—Actions triggered by measured parameters
    • F17C2250/072—Action when predefined value is reached
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2260/00—Purposes of gas storage and gas handling
    • F17C2260/02—Improving properties related to fluid or fluid transfer
    • F17C2260/022—Avoiding overfilling
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2265/00—Effects achieved by gas storage or gas handling
    • F17C2265/06—Fluid distribution
    • F17C2265/065—Fluid distribution for refueling vehicle fuel tanks

Definitions

  • the present invention when a vehicle equipped with a DME fuel-using engine and a plurality of fuel tanks for DME fuel is simultaneously filled with fuel, a shock wave is generated when the fuel supply to the fuel tank is stopped.
  • the present invention relates to a fuel filling method and a fuel filling system of DME fuel that can be prevented from occurring and can be filled in a short time.
  • the fuel supply system for automobiles that use DME (dimethyl ether) fuel is manufactured in conformity with the construction handling standards for LP gas automobiles under the current laws and regulations.
  • DME fuel is supplied from a fuel supply stand, but currently, the supply method is very similar to the LP gas supply stand.
  • the fuel in the storage tank provided in the fuel supply stand is pumped by a pump (fuel pump) to a meter (dispenser: liquid metering device), and the hose for supply attached to this meter
  • the fuel tank is supplied.
  • a nozzle that can be connected to the filling port of the fuel tank on the automobile side is attached to the tip of the supply hose so that it can be attached to and detached from the fuel tank.
  • Fuel filling is performed by attaching a nozzle on the meter side to the filling port of the fuel tank and supplying the fuel stored in the storage tank to the fuel tank by a pressure pump.
  • the fuel is supplied or stopped by opening and closing a valve attached to the nozzle.
  • the fuel supply is stopped at the nozzle side (fuel supply side) and the fuel tank 10 on the automobile side (receiving side) as in the fuel filling system 1X shown in FIG.
  • An overfilling prevention device 12 is provided, and fuel fed from a fuel storage tank 30 by a pressure pump 40 is supplied from a filling nozzle 21 of a meter (dispenser) 20 to a filling port 13.
  • the overfill prevention device 12 provided in the fuel tank 10 functions to shut off the supply port 13 and supply it.
  • There is a method of stopping filling by relieving the fuel on the system side and stopping the supply-side pressure pump 40 from stopping. Thereafter, the pumping pump 40 is stopped, for example, by stopping the switch on the supply side.
  • the fuel supply flow rate is approximately 20-30 (1 / min), which is widely used in large trucks. Considering the fuel supply flow rate is not enough.
  • DME has a lower calorific value than light oil, and an amount of 1.86 times the volume ratio is required to obtain the same calorific value. That is, in order to obtain a cruising distance equivalent to that of a light oil vehicle, it is necessary to load 1.86 times as much fuel. For this reason, high-speed filling is required for the filling speed, and when it is supplied in the same time as the current oil supply, a filling speed of 80 to 100 (1 / min) is required.
  • the filling flow rate is reduced before the fuel in the fuel tank becomes full, that is, before the overfill prevention device is activated.
  • a method of reducing shock waves by dropping on the supply side for example, liquid level information is acquired, and when the decelerating liquid level is high, filling is performed at a high filling speed, and when the decelerating liquid level is reached, the speed is decelerated from the high speed filling speed to the threshold liquid level.
  • a DME fuel filling system has been proposed in which the filling speed can be sufficiently reduced before the maximum filling amount is reached, and the water hammer effect caused by the filling stop is sufficiently suppressed.
  • Such a fuel filling system is, for example, a fuel filling system 1Y as shown in FIG. 11 or a fuel filling system 1Z as shown in FIG. 12, and the fuel tank 10 on the automobile side (receiving side) is prevented from being overfilled.
  • a liquid level gauge 11 is provided in addition to the device 12, and the fuel sent from the fuel storage tank 30 by the pressure feed pump 40 is controlled from the filling nozzle 21 while controlling the flow rate control valve 22 of the meter (dispenser) 20. Supply to the filling port 13.
  • This control is performed according to the control flow illustrated in FIG. 13, and the measured value of the liquid level gauge (liquid level sensor) 11 indicating the liquid level (fuel level) of the fuel tank 10 in step S11 is measured on the measuring instrument 20 side. It is determined whether it can be used, that is, whether or not the liquid level level can be measured on the measuring instrument 20 side. If not (NO), the process goes to step S13, and the second filling speed (low speed) Filling speed) Fuel is filled at a low flow rate of V2. On the other hand, when the liquid level can be measured (YES), the process goes to step S12, and the time set in advance at the high flow rate filling at the first filling speed (high speed filling speed) V1 (the liquid at S15).
  • step S14 For a period of time related to the surface level check interval), then the liquid level is measured in step S14, and the fuel level set in advance in step S15 (decelerated liquid level height). Until the liquid level is reached (NO), the flow rate control valve 22 is adjusted and filled at the first filling speed V1, and when this liquid level is reached (YES), step S16. Then, the flow control valve 22 is adjusted to reduce the filling to a low flow rate filling at the second filling speed V2 at which the water hammer does not become a problem, and when the tank becomes full, the overfilling prevention device 12 automatically stops. If the automatic stop is performed, the filling operation is terminated in step S17 by stopping the pumping pump 40 or the like.
  • the level gauge 11 and the measuring instrument 20 are connected by the signal cable 50 in FIG. 11, but in FIG. 12, the transmitter 51 and the receiver 52 are connected between the level gauge 11 and the measuring instrument 20. Connected by wireless communication.
  • a liquid level gauge such as a float type liquid level gauge or an ultrasonic level sensor is attached as a liquid level gauge 11 for detecting the position of the liquid level in the fuel tank.
  • the liquid level is detected by transferring to a fuel supply-side meter (dispenser) 20 via an optical cable or radio and inputting fuel level information.
  • the liquid level information is transmitted to the measuring instrument by the liquid level gauge and cable (or wireless transmission / reception).
  • start the fuel supply by operating the pump.
  • the flow rate is, for example, 80 to 100 (1 / min).
  • the liquid level information detected by the liquid level gauge is continuously transmitted to the measuring instrument. If the meter determines that the liquid level has reached a predetermined level (for example, about 90% to 95% of the full tank state), the charging flow rate is a flow level that does not cause a problem when the shock wave is stopped. To slow down. After reducing the flow rate to this flow level, stop filling with the overfill prevention device, or determine whether the tank is full based on the liquid level information and stop the supply-side pump to stop the fuel supply. Stop.
  • the present invention has been made in view of the above situation, and its object is to provide a vehicle using a DME fuel equipped with a plurality of fuel tanks in order to secure the amount of fuel to be loaded for long-distance driving or the like.
  • DME fuel equipped with a plurality of fuel tanks in order to secure the amount of fuel to be loaded for long-distance driving or the like.
  • a fuel filling method of a DME fuel in a fuel tank includes a DME fuel-using engine and a fuel in a DME fuel tank for a vehicle equipped with a plurality of fuel tanks for DME fuel.
  • the control of the fuel filling speed to the fuel tank is performed not to the filling speed of each of the fuel tanks but to the entire fuel tank.
  • the filling speed of the entire fuel tank is set as the first filling speed, and then one fuel filling amount of the fuel tank is preset in the fuel tank.
  • the filling speed of the entire fuel tank is reduced to a second filling speed at which shock waves at the time of supply stop are not a problem.
  • the filling speed of the whole fuel tank is increased to the third filling speed
  • the filling speed of the entire fuel tank is reduced to the fourth filling speed
  • the fuel filling amount of the fuel tank reaches this fuel tank stop filling amount, only the filling of the second fuel tank is stopped. According to this method, since the filling speed of the second fuel tank is increased, the entire filling time can be shortened.
  • a fuel filling system for DME fuel in a fuel tank provides a DME fuel use engine and a vehicle equipped with a plurality of fuel tanks for DME fuel.
  • a liquid level gauge for detecting a fuel filling amount is provided on each of the fuel tanks on the vehicle side, and a fuel supply line for connecting the storage tank and the fuel tank is provided on the fuel stand side.
  • a filling control device for controlling the pressure feeding pump and the flow rate adjusting valve in response to the output of the liquid level gauge, and providing a pressure feeding pump and a flow rate adjusting valve in the middle of the fuel supply line;
  • the filling control device fills a plurality of the fuel tanks with fuel simultaneously, the fuel filling speed is controlled with the fuel tank. This is performed in batches for the filling speed of the entire fuel tank, not for the filling speed of the individual tanks.
  • the filling speed for the entire fuel tank is set as the first filling speed
  • the second filling that does not cause a shock wave at the time of stopping the supply of the filling speed to the whole fuel tank. Deceleration to a speed, and when the fuel filling amount of the first fuel tank reaches a preset stopping filling amount of the fuel tank, control is performed to stop only filling of the first fuel tank. Configured as follows.
  • the fuel tanks are filled with fuel simultaneously when fuel is filled.
  • the generation of a shock wave when filling is stopped can be easily avoided at a low cost with simple control.
  • the filling speed of the whole fuel tank is increased to the third filling speed.
  • the filling speed of the entire fuel tank is reduced to the fourth filling speed.
  • a contact switch that turns on and off when the liquid level gauge detects that the liquid level has reached the specified liquid level, and a parallel contact with the contact switch.
  • the contact switch With the electrical resistance provided, the contact switch is ON until the liquid level reaches the specified liquid level, the electric resistance value is substantially zero, and the liquid level reaches the specified liquid level.
  • the contact switch is turned off, and the electric resistance value is changed from a substantially zero state, and the liquid level gauge is connected in series to detect the liquid level of the entire fuel tank.
  • the vehicle using a plurality of fuel tanks using DME fuel is installed.
  • FIG. 1 is a diagram showing a configuration of a fuel filling system when there are two fuel tanks according to the first and second embodiments of the present invention.
  • FIG. 2 is a diagram showing a connection relationship of the liquid level gauge when there are two fuel tanks.
  • FIG. 3 is a diagram showing an electric circuit of signals of the liquid level gauges of the first and second embodiments according to the present invention, and shows a case where both of the two liquid level gauges have not reached the preset liquid level.
  • FIG. 4 is a diagram showing an electric circuit of the signal of the liquid level gauge according to the first and second embodiments according to the invention, and shows a case where one liquid level gauge has reached a preset liquid level.
  • FIG. 1 is a diagram showing a configuration of a fuel filling system when there are two fuel tanks according to the first and second embodiments of the present invention.
  • FIG. 2 is a diagram showing a connection relationship of the liquid level gauge when there are two fuel tanks.
  • FIG. 3 is a diagram showing an electric circuit
  • FIG. 5 is a diagram showing a control flow of the fuel filling method according to the first embodiment of the present invention.
  • FIG. 6 is a diagram showing temporal changes in the resistance value of the liquid level gauge and the fuel supply amount in the fuel filling method according to the first embodiment of the present invention.
  • FIG. 7 is a diagram showing a control flow of the fuel filling method according to the second embodiment of the present invention.
  • FIG. 8 is a diagram showing a detailed control flow in step S20 of the control flow in FIG.
  • FIG. 9 is a diagram showing temporal changes in the resistance value of the liquid level gauge and the fuel supply amount in the fuel filling method according to the second embodiment of the present invention.
  • FIG. 10 is a diagram illustrating a configuration of a fuel filling system in the case where there is one vehicle-side fuel tank.
  • FIG. 11 is a diagram showing the configuration of the fuel filling system when there is one fuel tank on the vehicle side and a level gauge and a signal cable are used.
  • FIG. 12 is a diagram showing a configuration of a fuel filling system when there is one fuel tank on the vehicle side and a liquid level gauge and a radio signal are used.
  • FIG. 13 is a diagram showing a control flow of the conventional fuel filling method.
  • the number of fuel tanks will be described as two.
  • the present invention is not limited to the number of fuel tanks, but two or more, in other words, fuel filling for filling a plurality of fuel tanks with DME fuel. Applicable to systems and fuel filling methods.
  • the fuel filling system 1 for a DME fuel tank is provided with two fuel tanks 10A and 10B on the vehicle side (receiving side: automobile side).
  • the liquid level gauges 11A and 11B are respectively arranged, and an overfill prevention device 12 is provided.
  • the fuel sent from the DME fuel storage tank 30 by the pressure feed pump 40 is supplied from the filling nozzle 21 of the meter (dispenser: filling control device) 20 to the filling port 13 on the vehicle side via the flow rate control valve 22.
  • the overfilling prevention device 12 automatically stops.
  • the detection signals of the liquid level gauges 11A and 11B are input to the measuring instrument (dispenser) 20 side by the electric circuit 14 and the signal cable 50.
  • the level gauges 11A and 11B are configured such that the contact switch 11a is turned off when the fuel exceeds a preset liquid level, and the electric level switch 11a is electrically connected in parallel with the contact switch 11a.
  • the electric circuit 14 to which the resistor 11b is connected is configured. In other words, when the fuel reaches the specified liquid level, the contact switch 11a becomes non-contact as shown in FIG. 4, and the resistance value is changed by the electric resistor 11b attached in parallel. Then, the level gauges 11A and 11B are attached to the respective fuel tanks 10A and 10B, and further connected in series. In addition, energization is allowed until the specified liquid level is reached.
  • the electric circuit 14 and the signal cable 50 are indicated by a one-dot chain line in FIGS. 1 and 2 and a solid line in FIGS. 3 and 4.
  • a filling nozzle (dispenser nozzle) 21 is set in the fuel filling port 13 of the fuel tank 10A, 10B on the vehicle side.
  • the communication cable 50 is connected to the electric circuit 14 of the liquid level gauges 11A and 11B on the vehicle side simultaneously or in advance. This operation is not necessary when using wireless.
  • the contact switches 11a of the liquid level gauges 11A and 11B are closed and the electric circuit 14 is closed.
  • the control flow of FIG. 5 is started, and the measured value of the liquid level meter (liquid level sensor) 11 indicating the liquid level (fuel level) of the fuel tank 10 in the first step S11 is measured. In other words, it is determined whether or not the liquid level can be measured on the measuring instrument 20 side. If this determination is not possible (NO), the process goes to step S13, and the fuel is filled with low flow rate filling at the second filling speed (low speed filling speed) V2 in order to avoid the occurrence of a shock wave.
  • step S12 when the liquid level can be measured (YES), the process goes to step S12, and the time set in advance at the high flow rate filling at the first filling speed (high speed filling speed) V1 (the liquid at S15). For a period of time related to the surface level check interval).
  • the first filling speed V1 is a flow rate that passes through the flow rate control valve 22, and is set to, for example, 160 to 200 (l / min). That is, 80 to 100 (l / min) per fuel tank.
  • the second filling speed V2 is a flow rate that passes through the flow rate control valve 22, and is set to, for example, 20 to 60 (l / min). That is, 10 to 30 (l / min) per fuel tank.
  • step S14 the liquid level is measured, and in the next step S15, it is determined whether any one of the fuel tanks 10A, 10B has reached a predetermined liquid level (deceleration liquid level). Until one of the fuel tanks 10A (or 10B) reaches this liquid level (NO), the flow rate control valve 22 is adjusted and filled at the first filling speed V1, until one of the fuel tanks 10A (or 10B) reaches this liquid level.
  • the contact switch 11a on the right side of the drawing is turned OFF, and the electric circuit 14 operates so that one electric resistor 11b acts as a resistance. Therefore, it can be determined whether or not this state is present. If it is determined in step S15 that this state has been reached (YES), the process goes to step S16A, and the flow rate control valve 22 is adjusted to perform filling at the second filling speed V2 at which the water hammer does not cause a problem.
  • the overfilling prevention device 12 automatically stops in step S17A. Thereafter, filling is performed at a fourth filling speed V4 that is half of the second filling speed V2, and the other fuel tank 10B (or 10A) is filled at the second filling speed V2 in step S16A in step S16B.
  • the overfilling prevention device 12 automatically stops at step S17B.
  • the filling pump is terminated in step S18 by stopping the pressure feed pump 40 or the like.
  • the other fuel tank 10B (or 10A) continues to be filled at a low flow rate, and the filling is continued until the overfill prevention device 12 is activated.
  • the overfill prevention device 12 is activated and filling is stopped.
  • the fuel tank 10A (or 10B) that reaches the full tank first is controlled so as to be filled at a low flow rate, and the shock wave Prevent damage caused by.
  • the fuel in one of the fuel tanks 10A (or 10B) reaches a preset liquid level from the time ta when the filling of the fuel is started, and the electric resistance is “R0”.
  • FIG. 7 a fuel filling system and a fuel filling method in a DME fuel-using engine according to a second embodiment will be described with reference to FIGS. 7, 8 and 9.
  • FIG. The fuel filling system and the fuel filling method in the second embodiment are different from the fuel filling system and the fuel filling method in the first embodiment after one of the fuel tanks 10A and 10B becomes full. The difference is that the flow rate to be filled is increased again.
  • the fuel filling method of the second embodiment is the same as that of the first embodiment shown in the control flow of FIG. 5 in steps S11 to S17A of FIG. 7, and the other fuel tank 10B ( Or the control of the continuation of filling to 10A) is only different as shown in FIG.
  • step S21 this decrease is determined on the measuring instrument 20 side, the filling stop of one fuel tank 10A (or 10B) is confirmed, and in step S22, The filling of the other fuel tank 10B (or 10A) is switched to the high flow rate filling at the third filling speed V3.
  • the third filling speed V3 after passing through the flow control valve 22 to be half of the first filling speed V1
  • the other fuel tank 10B is filled in the same manner as when filling at the first filling speed V1 in step S12.
  • (Or 10A) can be filled at a high flow rate.
  • the first filling speed V1 is set to 160 to 200 (l / min) and the third filling speed V3 is set to 80 to 100 (l / min) at the flow rate when passing through the flow control valve 22.
  • step S22 the time set in advance at the high flow rate filling at the third filling speed V3 (step The fuel is charged for a time period related to the liquid level check interval in S24).
  • step S23 the liquid level is measured, and in the next step S24, whether or not the other fuel tank 10B (or 10A) has reached a predetermined liquid level (deceleration liquid level height).
  • a predetermined liquid level deceleration liquid level height
  • the flow rate control valve 22 is adjusted to increase the third filling speed V3 for filling, and when this liquid level is reached (YES), it is shown in FIG.
  • the flow rate control valve 22 is adjusted in step S25, and the water filling effect does not become a problem. (Low speed filling speed) The speed is reduced to low flow rate filling of V4.
  • the fourth filling speed V4 as a whole after passing through the flow rate control valve 22 is set to half of the second filling speed V2 as a whole, so that it is the same as the case of filling at the second filling speed V2 in step S16A.
  • the other fuel tank 10B (or 10A) can be filled with low flow rate filling.
  • the second filling speed V2 is set to 20 to 60 (l / min) and the fourth filling speed V4 is set to 10 to 30 (l / min) at the flow rate when passing through the flow control valve 22.
  • the fuel tank 10A (or 10B) that fills first is preferentially controlled to low flow rate filling, and damage due to shock waves is prevented.
  • the filling time of the other fuel tank 10B (or 10A) is shortened again as a high flow rate filling. .
  • the fuel in one of the fuel tanks 10 ⁇ / b> A (or 10 ⁇ / b> B) reaches a preset liquid level from the time ta when filling of the fuel is started, and the electric resistance is “R0”.
  • time tb when one fuel tank 10A (or 10B) is in a full tank state and is automatically stopped by the overfill prevention device 12, time tc is reached.
  • the low flow rate filling is performed until the time point td when the filling stop of one fuel tank 10A (or 10B) can be confirmed.
  • the fuel in the other fuel tank 10B (or 10A) reaches a preset liquid level, and the electric resistance becomes “ The high flow rate filling can be performed up to the time point te when “R1” changes to “R1 + R2”. In addition, it fills with low flow volume until the time tf when the other fuel tank 10B (or 10A) is in a full tank state and automatically stops by the overfill prevention device 12.
  • the use of the DME fuel in which a plurality of fuel tanks 10A and 10B are mounted is used. While a vehicle is being filled with fuel, a plurality of fuel tanks 10A and 10B are simultaneously filled with fuel, and the generation of shock waves when filling is stopped can be easily avoided at a low cost.
  • the vehicle using DME fuel equipped with a plurality of fuel tanks is used.
  • the vehicle using DME fuel equipped with a plurality of fuel tanks is used.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Mathematical Physics (AREA)
  • Theoretical Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Biotechnology (AREA)
  • Sustainable Development (AREA)
  • Sustainable Energy (AREA)
  • Filling Or Discharging Of Gas Storage Vessels (AREA)
  • Loading And Unloading Of Fuel Tanks Or Ships (AREA)
  • Cooling, Air Intake And Gas Exhaust, And Fuel Tank Arrangements In Propulsion Units (AREA)

Abstract

After fuel filling has stopped in one of fuel tanks (10A, 10B), both fuel tanks (10A, 10B) are filled at a high flow rate; next, when the fuel filling amount of the second fuel tank (10A, 10B) has reached a deceleration filling amount of that fuel tank (10A, 10B), both fuel tanks (10A, 10B) are filled at a low flow rate, and when the fuel filling amount of the second fuel tank (10A, 10B) has reached the stopping filling amount of that fuel tank (10A, 10B), filling of the second fuel tank (10A, 10B) is stopped. By this means, in order to ensure the loading fuel amount for long-distance travel even for vehicles that use DME fuel and mount several fuel tanks, this method of filling DME fuel into fuel tanks and this fuel filling system can easily avoid the generation of shock waves when stopping fuel supply, while simultaneously filling multiple fuel tanks with fuel during fuel filling with simple control and at low cost.

Description

ＤＭＥ燃料の燃料タンクへの燃料充填方法及び燃料充填システムFuel filling method and fuel filling system for fuel tank of DME fuel
　本発明は、ＤＭＥ燃料使用エンジンと、複数のＤＭＥ燃料用の燃料タンクを搭載した車両に対して、複数の燃料タンクに同時に燃料を充填する際に、燃料タンクへの燃料供給の停止時に衝撃波が発生するのを回避でき、しかも、短い時間で充填できるＤＭＥ燃料の燃料タンクへの燃料充填方法及び燃料充填システムに関する。 According to the present invention, when a vehicle equipped with a DME fuel-using engine and a plurality of fuel tanks for DME fuel is simultaneously filled with fuel, a shock wave is generated when the fuel supply to the fuel tank is stopped. The present invention relates to a fuel filling method and a fuel filling system of DME fuel that can be prevented from occurring and can be filled in a short time.
　ＤＭＥ（ジメチルエーテル）燃料を使用する自動車の燃料供給装置は、現行法規ではＬＰガス自動車用構造取扱基準に準拠し作製されている。ＤＭＥ燃料の供給は燃料供給スタンドから供給するが、現在はＬＰガス供給スタンドと酷似した供給方法で行われている。 The fuel supply system for automobiles that use DME (dimethyl ether) fuel is manufactured in conformity with the construction handling standards for LP gas automobiles under the current laws and regulations. DME fuel is supplied from a fuel supply stand, but currently, the supply method is very similar to the LP gas supply stand.
　例えば、燃料供給スタンドに設けられている貯槽内の燃料を圧送ポンプ（燃料ポンプ）で、計量器（ディスペンサー：液体定量吐出装置）に圧送し、この計量器に取り付けられた供給用ホースで自動車側の燃料タンクに供給している。この供給用ホースの先端には、自動車側の燃料タンクの充填口と接続可能なノズルが取り付けられていて、燃料タンクと着脱可能としている。 For example, the fuel in the storage tank provided in the fuel supply stand is pumped by a pump (fuel pump) to a meter (dispenser: liquid metering device), and the hose for supply attached to this meter The fuel tank is supplied. A nozzle that can be connected to the filling port of the fuel tank on the automobile side is attached to the tip of the supply hose so that it can be attached to and detached from the fuel tank.
　燃料の充填は、燃料タンクの充填口に計量器側のノズルを装着して、圧送ポンプにより貯槽に貯められた燃料を燃料タンクに供給することで行う。また、燃料の供給、あるいは停止は、ノズルに取り付けられているバルブの開閉で行う。 Fuel filling is performed by attaching a nozzle on the meter side to the filling port of the fuel tank and supplying the fuel stored in the storage tank to the fuel tank by a pressure pump. The fuel is supplied or stopped by opening and closing a valve attached to the nozzle.
　そして、この充填装置の従来技術においては、燃料供給をノズル側（燃料供給側）で停止する方法と、図１０に示す燃料充填システム１Ｘのように、自動車側（受け入れ側）の燃料タンク１０に過充填防止装置１２を設けて構成し、燃料の貯槽３０から圧送ポンプ４０で送られてくる燃料を計量器（ディスペンサー）２０の充填ノズル２１から、充填口１３に供給し、燃料が燃料タンク１０内に充分に供給されて満タン状態（燃料タンク容量の約８５％）になると、燃料タンク１０内に装備されている過充填防止装置１２が機能し、充填口１３の配管を遮断し、供給系統側で燃料をリリーフすることで、供給側の圧送ポンプ４０は停止しない状態で、充填を停止する方法がある。その後、供給側のスイッチを停止する等することで、圧送ポンプ４０が停止される。 In the prior art of this filling apparatus, the fuel supply is stopped at the nozzle side (fuel supply side) and the fuel tank 10 on the automobile side (receiving side) as in the fuel filling system 1X shown in FIG. An overfilling prevention device 12 is provided, and fuel fed from a fuel storage tank 30 by a pressure pump 40 is supplied from a filling nozzle 21 of a meter (dispenser) 20 to a filling port 13. When the fuel tank is fully supplied and the tank is full (approximately 85% of the fuel tank capacity), the overfill prevention device 12 provided in the fuel tank 10 functions to shut off the supply port 13 and supply it. There is a method of stopping filling by relieving the fuel on the system side and stopping the supply-side pressure pump 40 from stopping. Thereafter, the pumping pump 40 is stopped, for example, by stopping the switch on the supply side.
　従来技術の充填装置は、乗用車あるいは小型トラックを前提にしているＬＰＧ燃料スタンドをベースにしている為、燃料供給流量は概ね２０～３０（１／ｍｉｎ）であり、これは大型トラックへの普及を考えると燃料供給流量は十分でない。ＤＭＥは軽油に対し発熱量が低く、同一発熱量を得ようとすると体積比で１．８６倍の量が必要となる。つまり、軽油車と同等の航続距離を得るためには、１．８６倍の燃料を積載する必要が生じる。そのため、充填速度についても高速充填が求められ、現在の軽油の給油と同等の時間で供給する場合には、８０～１００（１／ｍｉｎ）の充填速度が必要となる。 Since the filling device of the prior art is based on an LPG fuel stand premised on a passenger car or a small truck, the fuel supply flow rate is approximately 20-30 (1 / min), which is widely used in large trucks. Considering the fuel supply flow rate is not enough. DME has a lower calorific value than light oil, and an amount of 1.86 times the volume ratio is required to obtain the same calorific value. That is, in order to obtain a cruising distance equivalent to that of a light oil vehicle, it is necessary to load 1.86 times as much fuel. For this reason, high-speed filling is required for the filling speed, and when it is supplied in the same time as the current oil supply, a filling speed of 80 to 100 (1 / min) is required.
　一方、充填速度を上昇させると、過充填防止装置が作動した時に、弁の作動により配管内に衝撃波が発生し、供給系ライン、ホース、ノズル、計量器内に過大な圧力がかかるようになる。衝撃波が大きくなり、供給システム側が許容耐圧を超えると、各部品に悪影響が生じ、場合によっては、破損に至ることにもなる。 On the other hand, if the filling speed is increased, when the overfill prevention device is activated, a shock wave is generated in the piping due to the operation of the valve, and excessive pressure is applied to the supply system line, hose, nozzle, and measuring instrument. . When the shock wave becomes large and the supply system side exceeds the allowable withstand voltage, each component is adversely affected and may be damaged in some cases.
　この対策として、例えば、日本出願の特開２００９－１３８７５５号公報に記載されているように、燃料タンク内の燃料が満タンになる前、すなわち、過充填防止装置が作動する前に充填流量を供給側で落とし、衝撃波の低減を図る方法を採用している例がある。この例としては、例えば、液面高さ情報を取得して、減速液面高さまでは、高速充填速度で充填し、減速液面高さになると、閾液面高さまで、高速充填速度から減速し、最大充填量に達するまでに、充填速度を充分に減速できて、充填停止により発生する水撃作用を充分に抑制するＤＭＥ燃料充填システムが提案されている。 As a countermeasure, for example, as described in Japanese Patent Application Laid-Open No. 2009-138755, the filling flow rate is reduced before the fuel in the fuel tank becomes full, that is, before the overfill prevention device is activated. There is an example of adopting a method of reducing shock waves by dropping on the supply side. As an example of this, for example, liquid level information is acquired, and when the decelerating liquid level is high, filling is performed at a high filling speed, and when the decelerating liquid level is reached, the speed is decelerated from the high speed filling speed to the threshold liquid level. A DME fuel filling system has been proposed in which the filling speed can be sufficiently reduced before the maximum filling amount is reached, and the water hammer effect caused by the filling stop is sufficiently suppressed.
　このような燃料充填システムは、例えば、図１１に示すような燃料充填システム１Ｙ、又は、図１２に示すような燃料充填システム１Ｚであり、自動車側（受け入れ側）の燃料タンク１０に過充填防止装置１２に加えて液面計１１を設けて構成し、燃料の貯槽３０から圧送ポンプ４０で送られてくる燃料を計量器（ディスペンサー）２０の流量制御弁２２を制御しながら充填ノズル２１から、充填口１３に供給する。 Such a fuel filling system is, for example, a fuel filling system 1Y as shown in FIG. 11 or a fuel filling system 1Z as shown in FIG. 12, and the fuel tank 10 on the automobile side (receiving side) is prevented from being overfilled. A liquid level gauge 11 is provided in addition to the device 12, and the fuel sent from the fuel storage tank 30 by the pressure feed pump 40 is controlled from the filling nozzle 21 while controlling the flow rate control valve 22 of the meter (dispenser) 20. Supply to the filling port 13.
　この制御は図１３に例示するような制御フローで行われ、ステップＳ１１で燃料タンク１０の液面レベル（燃料レベル）を示す液面計（液面センサ）１１の測定値を計量器２０側で利用できるか、つまり、計量器２０側で液面レベルの計測が可能な状態になっているか否かを判定し、可能でない場合には（ＮＯ）、ステップＳ１３に行き、第２充填速度（低速充填速度）Ｖ２の低流量充填で燃料を充填する。一方、液面レベルの計測が可能な状態になっている場合には（ＹＥＳ）、ステップＳ１２に行き、第１充填速度（高速充填速度）Ｖ１の高流量充填で予め設定した時間（Ｓ１５の液面レベルのチェックのインターバルに関係する時間）の間燃料を充填し、次にステップＳ１４で液面レベルを計測し、次のステップＳ１５で燃料が予め設定した液面レベル（減速液面高さ）になったか否かを判定し、この液面レベルになるまでは（ＮＯ）、流量制御弁２２を調整して第１充填速度Ｖ１で充填し、この液面レベルになると（ＹＥＳ）、ステップＳ１６で流量制御弁２２を調整して水撃作用が問題にならない第２充填速度Ｖ２の低流量充填に減速して充填し、満タン状態になったら過充填防止装置１２で自動停止させる。自動停止したら、ステップＳ１７で、圧送ポンプ４０を停止する等して、充填作業を終了する。なお、液面計１１と計量器２０の間を、図１１では、信号ケーブル５０で接続しているが、図１２では、液面計１１と計量器２０の間を送信器５１と受信器５２による無線通信で接続している。 This control is performed according to the control flow illustrated in FIG. 13, and the measured value of the liquid level gauge (liquid level sensor) 11 indicating the liquid level (fuel level) of the fuel tank 10 in step S11 is measured on the measuring instrument 20 side. It is determined whether it can be used, that is, whether or not the liquid level level can be measured on the measuring instrument 20 side. If not (NO), the process goes to step S13, and the second filling speed (low speed) Filling speed) Fuel is filled at a low flow rate of V2. On the other hand, when the liquid level can be measured (YES), the process goes to step S12, and the time set in advance at the high flow rate filling at the first filling speed (high speed filling speed) V1 (the liquid at S15). For a period of time related to the surface level check interval), then the liquid level is measured in step S14, and the fuel level set in advance in step S15 (decelerated liquid level height). Until the liquid level is reached (NO), the flow rate control valve 22 is adjusted and filled at the first filling speed V1, and when this liquid level is reached (YES), step S16. Then, the flow control valve 22 is adjusted to reduce the filling to a low flow rate filling at the second filling speed V2 at which the water hammer does not become a problem, and when the tank becomes full, the overfilling prevention device 12 automatically stops. If the automatic stop is performed, the filling operation is terminated in step S17 by stopping the pumping pump 40 or the like. The level gauge 11 and the measuring instrument 20 are connected by the signal cable 50 in FIG. 11, but in FIG. 12, the transmitter 51 and the receiver 52 are connected between the level gauge 11 and the measuring instrument 20. Connected by wireless communication.
　また、燃料タンクの液面の位置を検出する液面計１１として、フロート式液面ゲージや超音波式液面センサ等の液面計を取り付け、この液面計１１の入力信号を電気ケーブルや光ケーブルや無線を介して、燃料供給側の計量器（ディスペンサー）２０へ転送して、燃料の液面情報を入力することで液面レベルの検出が行われている。 A liquid level gauge such as a float type liquid level gauge or an ultrasonic level sensor is attached as a liquid level gauge 11 for detecting the position of the liquid level in the fuel tank. The liquid level is detected by transferring to a fuel supply-side meter (dispenser) 20 via an optical cable or radio and inputting fuel level information.
　つまり、これらの燃料充填では、燃料タンクに充填ノズルをセットすると、液面レベルの情報が液面計、ケーブル（あるいは無線送受信）により計量器に伝達され、計量器側では、供給側システムの圧送ポンプを作動させて燃料供給を開始する。燃料充填開始時は高速充填とし、流量は例えば８０～１００（１／ｍｉｎ）とする。このとき、液面計で検出された液面レベル情報は連続的に計量器へ伝達される。そして、計量器では、液面レベルが所定のレベル（例えば、満タン状態の９０％～９５％程度）になったと判断した場合には、充填流量を供給停止時の衝撃波が問題にならない流量レベルまで減速させる。この流量レベルまで流量を落とした後、過充填防止装置により充填停止するか、又は、液面レベルの情報により満タンを判断して供給側の圧送ポンプを停止するかして、燃料の供給を停止する。 In other words, in these fuel fillings, when the filling nozzle is set in the fuel tank, the liquid level information is transmitted to the measuring instrument by the liquid level gauge and cable (or wireless transmission / reception). Start the fuel supply by operating the pump. At the start of fuel filling, high-speed filling is performed, and the flow rate is, for example, 80 to 100 (1 / min). At this time, the liquid level information detected by the liquid level gauge is continuously transmitted to the measuring instrument. If the meter determines that the liquid level has reached a predetermined level (for example, about 90% to 95% of the full tank state), the charging flow rate is a flow level that does not cause a problem when the shock wave is stopped. To slow down. After reducing the flow rate to this flow level, stop filling with the overfill prevention device, or determine whether the tank is full based on the liquid level information and stop the supply-side pump to stop the fuel supply. Stop.
　しかしながら、長距離走行するような大型トラック等の自動車の場合、積載燃料確保の為に、燃料タンクを複数本搭載する場合があるが、その場合に、燃料充填時において、上記のような衝撃波回避の方法を採用するに際して、それぞれの燃料タンクの制御を行うことは低コストの実現及び制御の簡素化を考慮すると困難であるという問題がある。 However, in the case of an automobile such as a large truck that travels for a long distance, a plurality of fuel tanks may be mounted in order to secure the loaded fuel. In adopting this method, there is a problem that it is difficult to control each fuel tank in consideration of low cost and simplified control.
日本出願の特開２００９－１３８７５５号公報Japanese Patent Application No. 2009-138755 filed in Japan
　本発明は、上記の状況を鑑みてなされたものであり、その目的は、長距離走行等に対しての積載燃料量を確保するために、燃料タンクを複数搭載するＤＭＥ燃料使用の自動車に対しても、簡素な制御でしかも低コストで、燃料充填時において、複数の燃料タンクに同時に燃料充填しながら、燃料供給停止時の衝撃波の発生を容易に回避できるＤＭＥ燃料の燃料タンクへの燃料充填方法と燃料充填システムを提供することにある。 The present invention has been made in view of the above situation, and its object is to provide a vehicle using a DME fuel equipped with a plurality of fuel tanks in order to secure the amount of fuel to be loaded for long-distance driving or the like. However, it is possible to easily fill the fuel tank with DME fuel that can easily avoid the generation of shock waves when the fuel supply is stopped while simultaneously filling the fuel tanks at the time of fuel filling with simple control and low cost. It is to provide a method and a fuel filling system.
　上記の目的を達成するための本発明のＤＭＥ燃料の燃料タンクへの燃料充填方法は、ＤＭＥ燃料使用エンジンと、複数のＤＭＥ燃料用の燃料タンクを搭載した車両に対するＤＭＥ燃料の燃料タンクへの燃料充填方法において、複数の前記燃料タンクに同時に燃料を充填する時に、前記燃料タンクへの燃料の充填速度の制御を、前記燃料タンクの個々への充填速度に対してではなく、前記燃料タンク全体への充填速度に対して一括して行うと共に、充填開始時には、前記燃料タンク全体への充填速度を第１充填速度とし、次に、前記燃料タンクの一つの燃料充填量がこの燃料タンクの予め設定した減速用充填量に到達したときに、前記燃料タンク全体への充填速度を供給停止時の衝撃波が問題にならない第２充填速度まで減速させ、前記一つ目の燃料タンクの燃料充填量がこの燃料タンクの予め設定した停止用充填量に到達したときに、前記一つ目の燃料タンクの充填のみを停止させることを特徴とする方法である。 In order to achieve the above object, a fuel filling method of a DME fuel in a fuel tank according to the present invention includes a DME fuel-using engine and a fuel in a DME fuel tank for a vehicle equipped with a plurality of fuel tanks for DME fuel. In the filling method, when a plurality of fuel tanks are filled with fuel at the same time, the control of the fuel filling speed to the fuel tank is performed not to the filling speed of each of the fuel tanks but to the entire fuel tank. At the start of filling, the filling speed of the entire fuel tank is set as the first filling speed, and then one fuel filling amount of the fuel tank is preset in the fuel tank. When the reduced deceleration filling amount is reached, the filling speed of the entire fuel tank is reduced to a second filling speed at which shock waves at the time of supply stop are not a problem. When the fuel filling quantity of the fuel tank reaches the stop loading a preset of the fuel tank, a method characterized by stopping only the filling of the first one of the fuel tank.
　この方法によれば、長距離走行等に対しての積載燃料量を確保するために、燃料タンクを複数搭載するＤＭＥ燃料使用の自動車に対して、燃料充填時に複数の燃料タンクに同時に燃料充填しながら、充填停止時の衝撃波の発生を簡素な制御でしかも低コストで容易に回避できる。 According to this method, in order to ensure the amount of fuel to be loaded for long-distance driving, etc., fuel is filled into a plurality of fuel tanks at the same time when fuel is filled in a vehicle using a plurality of fuel tanks using DME fuel. However, the generation of a shock wave when filling is stopped can be easily avoided at a low cost with simple control.
　また、上記のＤＭＥ燃料の燃料タンクへの燃料充填方法において、前記燃料タンクの一つで燃料の充填が停止した後、前記燃料タンク全体への充填速度を第３充填速度に増速し、次に、前記燃料タンクの二つ目の燃料充填量がこの燃料タンクの減速用充填量に到達したときに、前記燃料タンク全体への充填速度を第４充填速度まで減速させ、前記二つ目の燃料タンクの燃料充填量がこの燃料タンクの停止用充填量に到達したときに、前記二つ目の燃料タンクの充填のみを停止させる。この方法によれば、二つ目の燃料タンクへの充填速度を増速するので、全体の充填時間を短縮できる。 Further, in the fuel filling method of the DME fuel into the fuel tank, after the fuel filling is stopped in one of the fuel tanks, the filling speed of the whole fuel tank is increased to the third filling speed, When the second fuel filling amount of the fuel tank reaches the deceleration filling amount of the fuel tank, the filling speed of the entire fuel tank is reduced to the fourth filling speed, When the fuel filling amount of the fuel tank reaches this fuel tank stop filling amount, only the filling of the second fuel tank is stopped. According to this method, since the filling speed of the second fuel tank is increased, the entire filling time can be shortened.
　そして、上記の目的を達成するための本発明のＤＭＥ燃料の燃料タンクへの燃料充填システムは、ＤＭＥ燃料使用エンジンと、複数のＤＭＥ燃料用の燃料タンクを搭載した車両に対して、ＤＭＥ燃料の燃料タンクへの燃料充填システムにおいて、前記車両側に、前記燃料タンクのそれぞれに燃料充填量を検出する液面計を設けると共に、燃料スタンド側に貯槽と前記燃料タンクとを連結する燃料供給ラインを設け、該燃料供給ラインの途中に圧送ポンプと流量調整弁を、先端に充填ノズルをそれぞれ設け、更に、前記液面計の出力を受けて前記圧送ポンプと流量調整弁を制御する充填制御装置を設けて構成し、前記充填制御装置が、複数の前記燃料タンクに同時に燃料を充填する時に、前記燃料タンクへの燃料の充填速度の制御を、前記燃料タンクの個々への充填速度に対してではなく、前記燃料タンク全体への充填速度に対して一括して行うと共に、充填開始時には、前記燃料タンク全体への充填速度を第１充填速度とし、次に、前記燃料タンクの一つの燃料充填量がこの燃料タンクの予め設定した減速用充填量に到達したときに、前記燃料タンク全体への充填速度を供給停止時の衝撃波が問題にならない第２充填速度まで減速させ、前記一つ目の燃料タンクの燃料充填量がこの燃料タンクの予め設定した停止用充填量に到達したときに、前記一つ目の燃料タンクの充填のみを停止させる制御を行うように構成される。 In order to achieve the above object, a fuel filling system for DME fuel in a fuel tank according to the present invention provides a DME fuel use engine and a vehicle equipped with a plurality of fuel tanks for DME fuel. In the fuel filling system for the fuel tank, a liquid level gauge for detecting a fuel filling amount is provided on each of the fuel tanks on the vehicle side, and a fuel supply line for connecting the storage tank and the fuel tank is provided on the fuel stand side. A filling control device for controlling the pressure feeding pump and the flow rate adjusting valve in response to the output of the liquid level gauge, and providing a pressure feeding pump and a flow rate adjusting valve in the middle of the fuel supply line; When the filling control device fills a plurality of the fuel tanks with fuel simultaneously, the fuel filling speed is controlled with the fuel tank. This is performed in batches for the filling speed of the entire fuel tank, not for the filling speed of the individual tanks. At the start of filling, the filling speed for the entire fuel tank is set as the first filling speed, In addition, when one fuel filling amount of the fuel tank reaches a preset filling amount for deceleration of the fuel tank, the second filling that does not cause a shock wave at the time of stopping the supply of the filling speed to the whole fuel tank. Deceleration to a speed, and when the fuel filling amount of the first fuel tank reaches a preset stopping filling amount of the fuel tank, control is performed to stop only filling of the first fuel tank. Configured as follows.
　この構成によれば、長距離走行等に対しての積載燃料量を確保するために、燃料タンクを複数搭載するＤＭＥ燃料使用の自動車に対して、燃料充填時に複数の燃料タンクに同時に燃料充填しながら、充填停止時の衝撃波の発生を簡素な制御でしかも低コストで容易に回避できる。 According to this configuration, in order to ensure the amount of fuel to be loaded for long-distance driving, etc., for a vehicle using DME fuel equipped with a plurality of fuel tanks, the fuel tanks are filled with fuel simultaneously when fuel is filled. However, the generation of a shock wave when filling is stopped can be easily avoided at a low cost with simple control.
　また、上記のＤＭＥ燃料の燃料タンクへの燃料充填システムにおいて、前記燃料タンクの一つで燃料の充填が停止した後、前記燃料タンク全体への充填速度を第３充填速度に増速し、次に、前記燃料タンクの二つ目の燃料充填量がこの燃料タンクの減速用充填量に到達したときに、前記燃料タンク全体への充填速度を第４充填速度まで減速させ、前記二つ目の燃料タンクの燃料充填量がこの燃料タンクの停止用充填量に到達したときに、前記二つ目の燃料タンクの充填のみを停止させる制御を行うように構成される。この構成によれば、二つ目の燃料タンクへの充填速度を増速するので、全体の充填時間を短縮できる。 Further, in the fuel filling system for DME fuel into the fuel tank, after the fuel filling is stopped in one of the fuel tanks, the filling speed of the whole fuel tank is increased to the third filling speed. When the second fuel filling amount of the fuel tank reaches the deceleration filling amount of the fuel tank, the filling speed of the entire fuel tank is reduced to the fourth filling speed, When the fuel filling amount of the fuel tank reaches the fuel tank stopping filling amount, control is performed to stop only filling of the second fuel tank. According to this configuration, since the filling speed of the second fuel tank is increased, the entire filling time can be shortened.
　また、上記のＤＭＥ燃料の燃料タンクへの燃料充填システムにおいて、前記液面計を、液面が指定の液面に達したことを検出するとＯＮ－ＯＦＦする接点スイッチと、該接点スイッチと並列に設けられる電気抵抗を備えて、液面が前記指定の液面レベルに達するまでは前記接点スイッチがＯＮで、電気抵抗値が略ゼロの状態となり、液面が前記指定の液面レベルに達したことを検出すると前記接点スイッチがＯＦＦとなり、前記電気抵抗値の値が略ゼロの状態から変化するように形成すると共に、前記液面計を直列に連結して、燃料タンク全体としての液面検出用の電気回路とし、該電気回路における電気抵抗の変化から前記燃料タンクの燃料充填量が前記減速用充填量に到達したことを検出するように構成される。この構成によれば、非常に簡単な回路構成により、複数の燃料タンクへの充填速度を一括して制御できるようになる。 Further, in the fuel filling system of the DME fuel into the fuel tank, a contact switch that turns on and off when the liquid level gauge detects that the liquid level has reached the specified liquid level, and a parallel contact with the contact switch. With the electrical resistance provided, the contact switch is ON until the liquid level reaches the specified liquid level, the electric resistance value is substantially zero, and the liquid level reaches the specified liquid level. When this is detected, the contact switch is turned off, and the electric resistance value is changed from a substantially zero state, and the liquid level gauge is connected in series to detect the liquid level of the entire fuel tank. And an electric circuit for detecting that the fuel filling amount of the fuel tank has reached the deceleration filling amount from a change in electric resistance in the electric circuit. According to this configuration, it is possible to collectively control the filling speeds of the plurality of fuel tanks with a very simple circuit configuration.
　本発明のＤＭＥ燃料の燃料タンクへの燃料充填方法及び燃料充填システムによれば、長距離走行等に対しての積載燃料量を確保するために、燃料タンクを複数搭載するＤＭＥ燃料使用の自動車に対して、燃料充填時に複数の燃料タンクに同時に燃料充填しながら、充填停止時の衝撃波の発生を簡素な制御でしかも低コストで容易に回避できる。 According to the fuel filling method and the fuel filling system of the DME fuel of the present invention, in order to secure the amount of fuel loaded for long-distance driving or the like, the vehicle using a plurality of fuel tanks using DME fuel is installed. On the other hand, it is possible to easily avoid the generation of a shock wave at the time of filling stop at a low cost while simultaneously filling fuel into a plurality of fuel tanks at the time of fuel filling.
図１は、発明に係る第１及び第２の実施の形態の燃料タンクが２つの場合の燃料充填システムの構成を示す図である。FIG. 1 is a diagram showing a configuration of a fuel filling system when there are two fuel tanks according to the first and second embodiments of the present invention. 図２は、燃料タンクが２つの場合の液面計の接続関係の構成を示す図である。FIG. 2 is a diagram showing a connection relationship of the liquid level gauge when there are two fuel tanks. 図３は、発明に係る第１及び第２の実施の形態の液面計の信号の電気回路を示す図で、２つの液面計が両方とも予め設定した液面レベルに達していない場合を示す。FIG. 3 is a diagram showing an electric circuit of signals of the liquid level gauges of the first and second embodiments according to the present invention, and shows a case where both of the two liquid level gauges have not reached the preset liquid level. Show. 図４は、発明に係る第１及び第２の実施の形態の液面計の信号の電気回路を示す図で、一方の液面計が予め設定した液面レベルに達している場合を示す。FIG. 4 is a diagram showing an electric circuit of the signal of the liquid level gauge according to the first and second embodiments according to the invention, and shows a case where one liquid level gauge has reached a preset liquid level. 図５は、本発明に係る第１の実施の形態の燃料充填方法の制御フローを示す図である。FIG. 5 is a diagram showing a control flow of the fuel filling method according to the first embodiment of the present invention. 図６は、本発明に係る第１の実施の形態の燃料充填方法における、液面計の抵抗値と燃料供給量の時間的な変化を示す図である。FIG. 6 is a diagram showing temporal changes in the resistance value of the liquid level gauge and the fuel supply amount in the fuel filling method according to the first embodiment of the present invention. 図７は、本発明に係る第２の実施の形態の燃料充填方法の制御フローを示す図である。FIG. 7 is a diagram showing a control flow of the fuel filling method according to the second embodiment of the present invention. 図８は、図７の制御フローのステップＳ２０の詳細な制御フローを示す図である。FIG. 8 is a diagram showing a detailed control flow in step S20 of the control flow in FIG. 図９は、本発明に係る第２の実施の形態の燃料充填方法における、液面計の抵抗値と燃料供給量の時間的な変化を示す図である。FIG. 9 is a diagram showing temporal changes in the resistance value of the liquid level gauge and the fuel supply amount in the fuel filling method according to the second embodiment of the present invention. 図１０は、車両側の燃料タンクが一つの場合の燃料充填システムの構成を示す図である。FIG. 10 is a diagram illustrating a configuration of a fuel filling system in the case where there is one vehicle-side fuel tank. 図１１は、車両側の燃料タンクが一つで液面計と信号ケーブルを用いる場合の燃料充填システムの構成を示す図である。FIG. 11 is a diagram showing the configuration of the fuel filling system when there is one fuel tank on the vehicle side and a level gauge and a signal cable are used. 図１２は、車両側の燃料タンクが一つで液面計と無線信号を用いる場合の燃料充填システムの構成を示す図である。FIG. 12 is a diagram showing a configuration of a fuel filling system when there is one fuel tank on the vehicle side and a liquid level gauge and a radio signal are used. 図１３は、従来技術の燃料充填方法の制御フローを示す図である。FIG. 13 is a diagram showing a control flow of the conventional fuel filling method.
　以下、本発明に係る実施の形態のＤＭＥ燃料の燃料タンクへの燃料充填方法及び燃料充填システムについて説明する。以下、燃料タンクの数を２個で説明するが、本発明は燃料タンクの数は２個に限定されず、２個以上、言い換えれば、複数の燃料タンクに対してＤＭＥ燃料を充填する燃料充填システムや燃料充填方法に適用できる。 Hereinafter, a fuel filling method and a fuel filling system for DME fuel in a fuel tank according to an embodiment of the present invention will be described. Hereinafter, the number of fuel tanks will be described as two. However, the present invention is not limited to the number of fuel tanks, but two or more, in other words, fuel filling for filling a plurality of fuel tanks with DME fuel. Applicable to systems and fuel filling methods.
　図１に示すように、本発明に係る第１の実施の形態のＤＭＥ燃料の燃料タンクへの燃料充填システム１は、車両側（受け入れ側：自動車側）に２つの燃料タンク１０Ａ、１０Ｂが設けられ、それぞれに液面計１１Ａ、１１Ｂが配置されると共に、過充填防止装置１２を設けて構成する。そして、ＤＭＥ燃料の貯槽３０から圧送ポンプ４０で送られてくる燃料を、流量制御弁２２経由で計量器（ディスペンサー：充填制御装置）２０の充填ノズル２１から、車両側の充填口１３に供給し、燃料が満タン状態になったら過充填防止装置１２で自動停止させる。また、液面計１１Ａ、１１Ｂの検出信号は、電気回路１４と信号ケーブル５０により計量器（ディスペンサー）２０側に入力される。 As shown in FIG. 1, the fuel filling system 1 for a DME fuel tank according to the first embodiment of the present invention is provided with two fuel tanks 10A and 10B on the vehicle side (receiving side: automobile side). In addition, the liquid level gauges 11A and 11B are respectively arranged, and an overfill prevention device 12 is provided. The fuel sent from the DME fuel storage tank 30 by the pressure feed pump 40 is supplied from the filling nozzle 21 of the meter (dispenser: filling control device) 20 to the filling port 13 on the vehicle side via the flow rate control valve 22. When the fuel is full, the overfilling prevention device 12 automatically stops. The detection signals of the liquid level gauges 11A and 11B are input to the measuring instrument (dispenser) 20 side by the electric circuit 14 and the signal cable 50.
　また、図２～図４に示すように、液面計１１Ａ、１１Ｂは燃料が予め設定した液面レベルを超えると接点スイッチ１１ａがＯＦＦになるように構成され、この接点スイッチ１１ａと並列に電気抵抗１１ｂが接続されている電気回路１４を構成する。つまり、燃料が指定の液面レベルに達すると、接点スイッチ１１ａが、図４に示すように、無接点となり、並列に取り付けてある電気抵抗１１ｂにより、抵抗値が変化する構造とする。そして、この液面計１１Ａ、１１Ｂをそれぞれの燃料タンク１０Ａ、１０Ｂに取り付け、更に、直列に連結しておく。また、指定の液面レベルに達するまでは、通電可としておく。なお、電気回路１４と信号ケーブル５０は、図１と図２では一点鎖線で、図３と図４では実線で示してある。 Further, as shown in FIGS. 2 to 4, the level gauges 11A and 11B are configured such that the contact switch 11a is turned off when the fuel exceeds a preset liquid level, and the electric level switch 11a is electrically connected in parallel with the contact switch 11a. The electric circuit 14 to which the resistor 11b is connected is configured. In other words, when the fuel reaches the specified liquid level, the contact switch 11a becomes non-contact as shown in FIG. 4, and the resistance value is changed by the electric resistor 11b attached in parallel. Then, the level gauges 11A and 11B are attached to the respective fuel tanks 10A and 10B, and further connected in series. In addition, energization is allowed until the specified liquid level is reached. The electric circuit 14 and the signal cable 50 are indicated by a one-dot chain line in FIGS. 1 and 2 and a solid line in FIGS. 3 and 4.
　このような電気回路１４にすることで、燃料タンク１０Ａ、１０Ｂの一方が指定の液面レベルに達すると、その接点スイッチ１１ａが無接点となり、電流が電気抵抗１１ｂ側を通過するようになり、抵抗値が変化するので、計量器２０側で燃料タンク１０Ａ、１０Ｂの一方が、満タン（満充填）前の第１液面レベルまで達したか否かを判定でき、充填する流量を低流量に減速する制御が行えるようになる。 By using such an electric circuit 14, when one of the fuel tanks 10A, 10B reaches a specified liquid level, the contact switch 11a becomes non-contact, and the current passes through the electric resistance 11b side, Since the resistance value changes, it can be determined whether one of the fuel tanks 10A, 10B has reached the first liquid level before full tank (full filling) on the measuring instrument 20 side. It becomes possible to perform the control to decelerate.
　次に、本発明に係る第１の実施の形態のＤＭＥ燃料の燃料タンクへの燃料充填方法について、図５と図６を参照しながら説明する。この燃料充填方法では、車両側の燃料タンク１０Ａ、１０Ｂの燃料充填口１３に充填ノズル（ディスペンサーノズル）２１をセットする。計量器２０側の通信ケーブル５０を用いて制御する場合には、このセットと同時にあるいは、前もって、この通信ケーブル５０を車両側の液面計１１Ａ、１１Ｂの電気回路１４に接続する。なお、この操作は無線を使用する場合には不要となる。 Next, a method of filling the fuel tank with the DME fuel according to the first embodiment of the present invention will be described with reference to FIGS. In this fuel filling method, a filling nozzle (dispenser nozzle) 21 is set in the fuel filling port 13 of the fuel tank 10A, 10B on the vehicle side. When the control is performed using the communication cable 50 on the measuring instrument 20 side, the communication cable 50 is connected to the electric circuit 14 of the liquid level gauges 11A and 11B on the vehicle side simultaneously or in advance. This operation is not necessary when using wireless.
　充填開始前で、燃料タンク１０Ａ、１０Ｂ内の燃料が少ない場合には、それぞれの液面計１１Ａ、１１Ｂの接点スイッチ１１ａは閉じていて電気回路１４は閉じている。充填制御を開始すると、図５の制御フローがスタートし、最初のステップＳ１１で燃料タンク１０の液面レベル（燃料レベル）を示す液面計（液面センサ）１１の測定値を計量器２０側で利用できるか、つまり、計量器２０側で液面レベルの計測が可能な状態になっているか否かを判定する。この判定で可能でない場合には（ＮＯ）、ステップＳ１３に行き、万一の衝撃波の発生を回避するために、第２充填速度（低速充填速度）Ｖ２の低流量充填で燃料を充填する。一方、液面レベルの計測が可能な状態になっている場合には（ＹＥＳ）、ステップＳ１２に行き、第１充填速度（高速充填速度）Ｖ１の高流量充填で予め設定した時間（Ｓ１５の液面レベルのチェックのインターバルに関係する時間）の間燃料を充填する。 When the fuel in the fuel tanks 10A and 10B is small before the filling starts, the contact switches 11a of the liquid level gauges 11A and 11B are closed and the electric circuit 14 is closed. When the filling control is started, the control flow of FIG. 5 is started, and the measured value of the liquid level meter (liquid level sensor) 11 indicating the liquid level (fuel level) of the fuel tank 10 in the first step S11 is measured. In other words, it is determined whether or not the liquid level can be measured on the measuring instrument 20 side. If this determination is not possible (NO), the process goes to step S13, and the fuel is filled with low flow rate filling at the second filling speed (low speed filling speed) V2 in order to avoid the occurrence of a shock wave. On the other hand, when the liquid level can be measured (YES), the process goes to step S12, and the time set in advance at the high flow rate filling at the first filling speed (high speed filling speed) V1 (the liquid at S15). For a period of time related to the surface level check interval).
　この第１充填速度Ｖ１は、流量制御弁２２を通過する流量で、例えば、１６０～２００（ｌ／ｍｉｎ）とする。つまり、燃料タンク１個当たり、８０～１００（ｌ／ｍｉｎ）とする。また、第２充填速度Ｖ２は、流量制御弁２２を通過する流量で、例えば、２０～６０（ｌ／ｍｉｎ）とする。つまり、燃料タンク１個当たり、１０～３０（ｌ／ｍｉｎ）とする。 The first filling speed V1 is a flow rate that passes through the flow rate control valve 22, and is set to, for example, 160 to 200 (l / min). That is, 80 to 100 (l / min) per fuel tank. The second filling speed V2 is a flow rate that passes through the flow rate control valve 22, and is set to, for example, 20 to 60 (l / min). That is, 10 to 30 (l / min) per fuel tank.
　次にステップＳ１４で液面レベルを計測し、次のステップＳ１５で、燃料タンク１０Ａ、１０Ｂのいずれか一方が、燃料が予め設定した液面レベル（減速液面高さ）になったか否かを判定し、いずれか一方の燃料タンク１０Ａ(又は１０Ｂ)がこの液面レベルになるまでは（ＮＯ）、流量制御弁２２を調整して第１充填速度Ｖ１で充填し、いずれか一方の燃料タンク１０Ａ(又は１０Ｂ)がこの液面レベルになると（ＹＥＳ）、図４に示すように、図面右側の接点スイッチ１１ａがＯＦＦになり、電気回路１４は一つの電気抵抗１１ｂが抵抗として作用するようになるので、この状態であるか否かを判定できる。ステップＳ１５の判定でこの状態になったと判定したら（ＹＥＳ）、ステップＳ１６Ａに行き、流量制御弁２２を調整して水撃作用が問題にならない第２充填速度Ｖ２で充填する。 Next, in step S14, the liquid level is measured, and in the next step S15, it is determined whether any one of the fuel tanks 10A, 10B has reached a predetermined liquid level (deceleration liquid level). Until one of the fuel tanks 10A (or 10B) reaches this liquid level (NO), the flow rate control valve 22 is adjusted and filled at the first filling speed V1, until one of the fuel tanks 10A (or 10B) reaches this liquid level. When 10A (or 10B) reaches this liquid level (YES), as shown in FIG. 4, the contact switch 11a on the right side of the drawing is turned OFF, and the electric circuit 14 operates so that one electric resistor 11b acts as a resistance. Therefore, it can be determined whether or not this state is present. If it is determined in step S15 that this state has been reached (YES), the process goes to step S16A, and the flow rate control valve 22 is adjusted to perform filling at the second filling speed V2 at which the water hammer does not cause a problem.
　このステップＳ１６Ａの第２充填速度Ｖ２で一方の燃料タンク１０Ａ（又は１０Ｂ）が満タン状態になったら、ステップＳ１７Ａで過充填防止装置１２で自動停止させる。その後は、第２充填速度Ｖ２の半分の第４充填速度Ｖ４で充填して、ステップＳ１６Ｂで、他方の燃料タンク１０Ｂ（又は１０Ａ）に対して、ステップＳ１６Ａの第２充填速度Ｖ２で充填する場合と同じ様に、低流量充填で充填を継続し、他方の燃料タンク１０Ｂ（又は１０Ａ）が満タン状態になったら、ステップＳ１７Ｂで過充填防止装置１２で自動停止させる。両方の燃料タンク１０Ａ、１０Ｂの燃料供給ラインが過充填防止装置１２で自動停止したら、ステップＳ１８で、圧送ポンプ４０を停止する等を行い、充填作業を終了する。 When one fuel tank 10A (or 10B) becomes full at the second filling speed V2 in step S16A, the overfilling prevention device 12 automatically stops in step S17A. Thereafter, filling is performed at a fourth filling speed V4 that is half of the second filling speed V2, and the other fuel tank 10B (or 10A) is filled at the second filling speed V2 in step S16A in step S16B. In the same manner as described above, when filling with low flow rate is continued and the other fuel tank 10B (or 10A) becomes full, the overfilling prevention device 12 automatically stops at step S17B. When the fuel supply lines of both the fuel tanks 10A and 10B are automatically stopped by the overfilling prevention device 12, the filling pump is terminated in step S18 by stopping the pressure feed pump 40 or the like.
　つまり、燃料充填を開始すると、計量器２０側では充填ノズル２１から燃料充填を開始するが、このときは第１充填速度Ｖ１の高流量充填とする。２つ搭載している燃料タンク１０Ａ、１０Ｂの内、いずれか一つの燃料タンク１０Ａ（又は１０Ｂ）が指定値、例えば満タン前の５％から１０％以下の予め設定した液面レベルになると、その燃料タンク１０Ａ（又は１０Ｂ）の液面計１１の接点スイッチ１１ａが開となるので、図３及び図４に示すような並行して備えている電気抵抗１１ｂ側のみの回路となり抵抗値が変化する。これにより、計量器２０側では、間もなく満タンになると判定し、燃料の充填を第２充填速度Ｖ２の低流量充填へ切り替える。その後、過充填防止装置１２が作動し、この一方の燃料タンク１０Ａ（又は１０Ｂ）の充填が終了する。 That is, when fuel filling is started, fuel filling is started from the filling nozzle 21 on the meter 20 side, and at this time, high flow rate filling at the first filling speed V1 is performed. When one of the two fuel tanks 10A, 10B has a predetermined liquid level of a specified value, for example, from 5% before full tank to 10% or less, Since the contact switch 11a of the level gauge 11 of the fuel tank 10A (or 10B) is opened, the resistance value changes as a circuit only on the side of the electric resistor 11b provided in parallel as shown in FIGS. To do. As a result, the meter 20 side determines that the tank will be full soon, and switches the fuel filling to the low flow rate filling at the second filling speed V2. Thereafter, the overfill prevention device 12 is operated, and the filling of the fuel tank 10A (or 10B) is completed.
　しかし、他方の燃料タンク１０Ｂ（又は１０Ａ）は低流量充填で充填が続き、過充填防止装置１２が作動するまで充填が継続される。この他方の燃料タンク１０Ｂ（又は１０Ａ）が満タンになると過充填防止装置１２が作動し、充填が停止される。 However, the other fuel tank 10B (or 10A) continues to be filled at a low flow rate, and the filling is continued until the overfill prevention device 12 is activated. When the other fuel tank 10B (or 10A) is full, the overfill prevention device 12 is activated and filling is stopped.
　この第１の実施の形態のＤＭＥ燃料使用エンジンにおける燃料充填システム及び燃料充填方法では、満タンを先に迎える燃料タンク１０Ａ（又は１０Ｂ）を優先して低流量充填になるように制御し、衝撃波による破損を防止する。これを、図６で見てみると、燃料の充填を開始した時点ｔａからどちらか一つの燃料タンク１０Ａ（又は１０Ｂ）の燃料が予め設定した液面レベルに到達して、電気抵抗が「Ｒ０」から「Ｒ１」に変化した時点ｔｂまでが高流量充填であり、この時点ｔｂから一方の燃料タンク１０Ａ（又は１０Ｂ）が満タン状態になって過充填防止装置１２で自動停止した時点ｔｃと他方の燃料タンク１０Ｂ（又は１０Ａ）の燃料が予め設定した液面レベルに到達して電気抵抗が「Ｒ１」から「Ｒ１＋Ｒ２」に変化した時点ｔｅを経由して、他方の燃料タンク１０Ｂ（又は１０Ａ）が満タン状態になって過充填防止装置１２で自動停止する時点ｔｆまでは低流量充填となる。 In the fuel filling system and the fuel filling method in the DME fuel-using engine according to the first embodiment, the fuel tank 10A (or 10B) that reaches the full tank first is controlled so as to be filled at a low flow rate, and the shock wave Prevent damage caused by. Looking at this in FIG. 6, the fuel in one of the fuel tanks 10A (or 10B) reaches a preset liquid level from the time ta when the filling of the fuel is started, and the electric resistance is “R0”. From time tb until one fuel tank 10A (or 10B) becomes full and automatically stops by the overfill prevention device 12 from time tc The fuel tank 10B (or 10A) of the other fuel tank 10B (or 10A) reaches the liquid level set in advance and the other fuel tank 10B (or 10A) passes through a time te when the electric resistance changes from “R1” to “R1 + R2”. ) Until the point of time tf when the tank is fully filled and automatically stops by the overfilling prevention device 12.
　従って、一方の燃料タンク１０Ａ（又は１０Ｂ）の充填の終了に際しても、他方の燃料タンク１０Ｂ（又は１０Ａ）の充填の終了に際しても、充填する流量は低流量充填に低下しているので、燃料供給停止時の水撃作用を回避できる。 Therefore, since the flow rate to be filled is reduced to the low flow rate filling at the end of the filling of one fuel tank 10A (or 10B) and the filling of the other fuel tank 10B (or 10A), the fuel supply The water hammer effect when stopping can be avoided.
　なお、上記のように燃料タンクが複数本搭載されている場合、概ね均等に消費されるように車両側の燃料供給を制御しておくことで、燃料充填時における、満タンになるまでの時間の差を燃料タンク間で少なくすることができるので、その効果をより大きくすることができる。 Note that when multiple fuel tanks are installed as described above, the time until the tank is full when fuel is filled by controlling the fuel supply on the vehicle side so that it is consumed approximately evenly. Since the difference between the fuel tanks can be reduced, the effect can be further increased.
　次に、第２の実施の形態のＤＭＥ燃料使用エンジンにおける燃料充填システム及び燃料充填方法について図７、図８と図９参照しながら説明する。この第２の実施の形態における燃料充填システム及び燃料充填方法は、第１の実施の形態における燃料充填システム及び燃料充填方法とは、燃料タンク１０Ａ、１０Ｂの一つが満タン状態になった後に、充填する流量を再び高流量化する点が異なる。 Next, a fuel filling system and a fuel filling method in a DME fuel-using engine according to a second embodiment will be described with reference to FIGS. 7, 8 and 9. FIG. The fuel filling system and the fuel filling method in the second embodiment are different from the fuel filling system and the fuel filling method in the first embodiment after one of the fuel tanks 10A and 10B becomes full. The difference is that the flow rate to be filled is increased again.
　この第２の実施の形態の燃料充填方法は、図７のステップＳ１１～Ｓ１７Ａまでは、図５の制御フロー出示す第１の実施の形態と同様であり、ステップＳ２０の他方の燃料タンク１０Ｂ（又は１０Ａ）への充填継続の制御が、図８に示すように異なるだけである。 The fuel filling method of the second embodiment is the same as that of the first embodiment shown in the control flow of FIG. 5 in steps S11 to S17A of FIG. 7, and the other fuel tank 10B ( Or the control of the continuation of filling to 10A) is only different as shown in FIG.
　図５の第１の実施の形態の制御フローでは、一方の燃料タンク１０Ａ（又は１０Ｂ）の充填が、過充填防止装置１２によって充填を終了するときに、２つの燃料タンク１０Ａ、１０Ｂへの流量に対し、一方の燃料タンク１０Ａ（又は１０Ｂ）への流量が減るので、全体の流量が低下する。 In the control flow of the first embodiment of FIG. 5, when the filling of one fuel tank 10 </ b> A (or 10 </ b> B) ends the filling by the overfill prevention device 12, the flow rate to the two fuel tanks 10 </ b> A and 10 </ b> B. On the other hand, since the flow rate to one fuel tank 10A (or 10B) decreases, the overall flow rate decreases.
　図７及び図８の第２の実施の形態では、ステップＳ２１で、この低下を計量器２０側で判定し、一方の燃料タンク１０Ａ（又は１０Ｂ）の充填停止の確認を行い、ステップＳ２２で、他方の燃料タンク１０Ｂ（又は１０Ａ）への充填を第３充填速度Ｖ３の高流量充填に切り替える。この流量制御弁２２を通過した後の第３充填速度Ｖ３を第１充填速度Ｖ１の半分とすることで、ステップＳ１２の第１充填速度Ｖ１で充填する場合と同じ様に、他方の燃料タンク１０Ｂ（又は１０Ａ）への充填を高流量充填で行うことができるようになる。この場合、流量制御弁２２を通過するときの流速で、例えば、第１充填速度Ｖ１を１６０～２００（ｌ／ｍｉｎ）とし、第３充填速度Ｖ３を８０～１００（ｌ／ｍｉｎ）とする。 In the second embodiment of FIG. 7 and FIG. 8, in step S21, this decrease is determined on the measuring instrument 20 side, the filling stop of one fuel tank 10A (or 10B) is confirmed, and in step S22, The filling of the other fuel tank 10B (or 10A) is switched to the high flow rate filling at the third filling speed V3. By setting the third filling speed V3 after passing through the flow control valve 22 to be half of the first filling speed V1, the other fuel tank 10B is filled in the same manner as when filling at the first filling speed V1 in step S12. (Or 10A) can be filled at a high flow rate. In this case, for example, the first filling speed V1 is set to 160 to 200 (l / min) and the third filling speed V3 is set to 80 to 100 (l / min) at the flow rate when passing through the flow control valve 22.
　その後の充填は、一方の燃料タンク１０Ａ（又は１０Ｂ）が満タン状態になるまでの充填制御と同じ様に行い、ステップＳ２２で、第３充填速度Ｖ３の高流量充填で予め設定した時間（ステップＳ２４の液面レベルのチェックのインターバルに関係する時間）の間燃料を充填する。 Subsequent filling is performed in the same manner as the filling control until one of the fuel tanks 10A (or 10B) is in a full tank state. In step S22, the time set in advance at the high flow rate filling at the third filling speed V3 (step The fuel is charged for a time period related to the liquid level check interval in S24).
　次にステップＳ２３で液面レベルを計測し、次のステップＳ２４で、他方の燃料タンク１０Ｂ（又は１０Ａ）が、燃料が予め設定した液面レベル（減速液面高さ）になったか否かを判定し、この液面レベルになるまでは（ＮＯ）、流量制御弁２２を調整して第３充填速度Ｖ３に増速して充填し、この液面レベルになると（ＹＥＳ）、図４に示すように、接点スイッチ１１ａの一つがＯＦＦになり、一つの電気抵抗１１ｂが電気回路１４の抵抗となるので、ステップＳ２５で流量制御弁２２を調整して水撃作用が問題にならない第４充填速度（低速充填速度）Ｖ４の低流量充填に減速して充填する。この流量制御弁２２を通過した後の全体としての第４充填速度Ｖ４を、全体としての第２充填速度Ｖ２の半分とすることで、ステップＳ１６Ａの第２充填速度Ｖ２で充填する場合と同じ様に、他方の燃料タンク１０Ｂ（又は１０Ａ）への充填を低流量充填で行うことができるようになる。この場合、流量制御弁２２を通過するときの流速で、例えば、第２充填速度Ｖ２を２０～６０（ｌ／ｍｉｎ）とし、第４充填速度Ｖ４を１０～３０（ｌ／ｍｉｎ）とする。 Next, in step S23, the liquid level is measured, and in the next step S24, whether or not the other fuel tank 10B (or 10A) has reached a predetermined liquid level (deceleration liquid level height). Until this liquid level is reached (NO), the flow rate control valve 22 is adjusted to increase the third filling speed V3 for filling, and when this liquid level is reached (YES), it is shown in FIG. As described above, since one of the contact switches 11a is turned OFF and one electric resistor 11b becomes the resistance of the electric circuit 14, the flow rate control valve 22 is adjusted in step S25, and the water filling effect does not become a problem. (Low speed filling speed) The speed is reduced to low flow rate filling of V4. The fourth filling speed V4 as a whole after passing through the flow rate control valve 22 is set to half of the second filling speed V2 as a whole, so that it is the same as the case of filling at the second filling speed V2 in step S16A. In addition, the other fuel tank 10B (or 10A) can be filled with low flow rate filling. In this case, for example, the second filling speed V2 is set to 20 to 60 (l / min) and the fourth filling speed V4 is set to 10 to 30 (l / min) at the flow rate when passing through the flow control valve 22.
　この第２の実施の形態のＤＭＥ燃料使用エンジンにおける燃料充填システム及び燃料充填方法では、満タンを先に迎える燃料タンク１０Ａ（又は１０Ｂ）を優先して低流量充填へ制御し、衝撃波による破損を防止すると共に、満タンを先に迎えた燃料タンク１０Ａ（又は１０Ｂ）への燃料充填が停止した後は、再度、高流量充填として、他方の燃料タンク１０Ｂ（又は１０Ａ）の充填時間を短縮する。 In the fuel filling system and the fuel filling method in the DME fuel-using engine according to the second embodiment, the fuel tank 10A (or 10B) that fills first is preferentially controlled to low flow rate filling, and damage due to shock waves is prevented. After the fuel filling to the fuel tank 10A (or 10B) that has reached the full tank is stopped, the filling time of the other fuel tank 10B (or 10A) is shortened again as a high flow rate filling. .
　これを、図９で見てみると、燃料の充填を開始した時点ｔａからどちらか一つの燃料タンク１０Ａ（又は１０Ｂ）の燃料が予め設定した液面レベルに到達して、電気抵抗が「Ｒ０」から「Ｒ１」に変化した時点ｔｂまでが高流量充填であり、この時点ｔｂから一方の燃料タンク１０Ａ（又は１０Ｂ）が満タン状態になって過充填防止装置１２で自動停止した時点ｔｃを経由して、一方の燃料タンク１０Ａ（又は１０Ｂ）の充填停止が確認できた時点ｔｄまでが低流量充填となる。 As seen from FIG. 9, the fuel in one of the fuel tanks 10 </ b> A (or 10 </ b> B) reaches a preset liquid level from the time ta when filling of the fuel is started, and the electric resistance is “R0”. From time tb, when one fuel tank 10A (or 10B) is in a full tank state and is automatically stopped by the overfill prevention device 12, time tc is reached. The low flow rate filling is performed until the time point td when the filling stop of one fuel tank 10A (or 10B) can be confirmed.
　更に、この一方の燃料タンク１０Ａ（又は１０Ｂ）の充填停止が確認できた時点ｔｄから、他方の燃料タンク１０Ｂ（又は１０Ａ）の燃料が予め設定した液面レベルに到達して、電気抵抗が「Ｒ１」から「Ｒ１＋Ｒ２」に変化する時点ｔｅまでを高流量充填とすることができる。なお、他方の燃料タンク１０Ｂ（又は１０Ａ）が満タン状態になって過充填防止装置１２で自動停止する時点ｔｆまでは低流量充填となる。 Furthermore, from the time td at which the filling stop of the one fuel tank 10A (or 10B) can be confirmed, the fuel in the other fuel tank 10B (or 10A) reaches a preset liquid level, and the electric resistance becomes “ The high flow rate filling can be performed up to the time point te when “R1” changes to “R1 + R2”. In addition, it fills with low flow volume until the time tf when the other fuel tank 10B (or 10A) is in a full tank state and automatically stops by the overfill prevention device 12.
　上記のＤＭＥ燃料の燃料タンクへの燃料充填方法及び燃料充填システムによれば、長距離走行等に対しての積載燃料量を確保するために、燃料タンク１０Ａ、１０Ｂを複数搭載するＤＭＥ燃料使用の自動車に対して、燃料充填時に複数の燃料タンク１０Ａ、１０Ｂに同時に燃料充填しながら、充填停止時の衝撃波の発生を簡素な制御でしかも低コストで容易に回避できる。 According to the fuel filling method and the fuel filling system of the DME fuel described above, in order to secure the amount of fuel to be loaded for long-distance traveling or the like, the use of the DME fuel in which a plurality of fuel tanks 10A and 10B are mounted is used. While a vehicle is being filled with fuel, a plurality of fuel tanks 10A and 10B are simultaneously filled with fuel, and the generation of shock waves when filling is stopped can be easily avoided at a low cost.
　本発明のＤＭＥ燃料の燃料タンクへの燃料充填方法と燃料充填システムによれば、長距離走行等に対しての積載燃料量を確保するために、燃料タンクを複数搭載するＤＭＥ燃料使用の自動車に対しても、簡素な制御でしかも低コストで、燃料充填時において、複数の燃料タンクに同時に燃料充填しながら、燃料供給停止時の衝撃波の発生を容易に回避できるので、燃料タンクを複数搭載するＤＭＥ燃料使用の自動車に利用できる。 According to the fuel filling method and the fuel filling system of the DME fuel of the present invention, in order to secure the amount of loaded fuel for a long-distance driving or the like, the vehicle using DME fuel equipped with a plurality of fuel tanks is used. On the other hand, with simple control and low cost, it is possible to easily avoid the generation of shock waves when stopping fuel supply while simultaneously filling fuel into multiple fuel tanks at the time of fuel filling. It can be used for automobiles using DME fuel.
１　燃料充填システム
１０Ａ、１０Ｂ　燃料タンク
１１Ａ、１１Ｂ　液面計
１１ａ　接点スイッチ
１１ｂ　電気抵抗
１２　過充填防止装置
１３　充填口
１４　電気回路
２０　計量器（ディスペンサー）
２１　充填ノズル
２２　流量制御弁
３０　貯槽
４０　圧送ポンプ
５０　信号ケーブル DESCRIPTION OF SYMBOLS 1 Fuel filling system 10A, 10B Fuel tank 11A, 11B Liquid level gauge 11a Contact switch 11b Electric resistance 12 Overfill prevention apparatus 13 Filling port 14 Electric circuit 20 Meter (dispenser)
21 Filling nozzle 22 Flow control valve 30 Storage tank 40 Pressure pump 50 Signal cable

Claims (5)

  1. 　ＤＭＥ燃料使用エンジンと、複数のＤＭＥ燃料用の燃料タンクを搭載した車両に対するＤＭＥ燃料の燃料タンクへの燃料充填方法において、
    　複数の前記燃料タンクに同時に燃料を充填する時に、前記燃料タンクへの燃料の充填速度の制御を、前記燃料タンクの個々への充填速度に対してではなく、前記燃料タンク全体への充填速度に対して一括して行うと共に、
    　充填開始時には、前記燃料タンク全体への充填速度を第１充填速度とし、
    　次に、前記燃料タンクの一つの燃料充填量がこの燃料タンクの予め設定した減速用充填量に到達したときに、前記燃料タンク全体への充填速度を供給停止時の衝撃波が問題にならない第２充填速度まで減速させ、
    　前記一つ目の燃料タンクの燃料充填量がこの燃料タンクの予め設定した停止用充填量に到達したときに、前記一つ目の燃料タンクの充填のみを停止させることを特徴とするＤＭＥ燃料の燃料タンクへの燃料充填方法。     In a method of filling a fuel tank with DME fuel for a vehicle equipped with a DME fuel-using engine and a plurality of fuel tanks for DME fuel,
    When simultaneously filling a plurality of fuel tanks, control of the fuel filling speed to the fuel tank is not performed to the filling speed of each of the fuel tanks, but to the filling speed of the entire fuel tank. For all at once,
    At the start of filling, the filling speed of the entire fuel tank is set as the first filling speed,
    Next, when one fuel filling amount of the fuel tank reaches a preset filling amount for deceleration of the fuel tank, a shock wave at the time of stopping the supply of the filling speed to the whole fuel tank is not a second problem. Decelerate to filling speed,
    When the fuel filling amount of the first fuel tank reaches a preset stopping filling amount of the fuel tank, only filling of the first fuel tank is stopped. How to fill the fuel tank.
  2. 　前記燃料タンクの一つで燃料の充填が停止した後、前記燃料タンク全体への充填速度を第３充填速度に増速し、
    　次に、前記燃料タンクの二つ目の燃料充填量がこの燃料タンクの減速用充填量に到達したときに、前記燃料タンク全体への充填速度を第４充填速度まで減速させ、
    　前記二つ目の燃料タンクの燃料充填量がこの燃料タンクの停止用充填量に到達したときに、前記二つ目の燃料タンクの充填のみを停止させることを特徴とする請求項１に記載のＤＭＥ燃料の燃料タンクへの燃料充填方法。     After filling of fuel in one of the fuel tanks is stopped, the filling speed of the whole fuel tank is increased to a third filling speed,
    Next, when the second fuel filling amount of the fuel tank reaches the deceleration filling amount of the fuel tank, the filling speed of the entire fuel tank is reduced to the fourth filling speed,
    2. The filling of the second fuel tank is stopped only when the fuel filling amount of the second fuel tank reaches a filling amount for stopping the fuel tank. A method of filling a fuel tank with DME fuel.
  3. 　ＤＭＥ燃料使用エンジンと、複数のＤＭＥ燃料用の燃料タンクを搭載した車両に対して、ＤＭＥ燃料の燃料タンクへの燃料充填システムにおいて、
    　前記車両側に、前記燃料タンクのそれぞれに燃料充填量を検出する液面計を設けると共に、
    　燃料スタンド側に貯槽と前記燃料タンクとを連結する燃料供給ラインを設け、該燃料供給ラインの途中に圧送ポンプと流量調整弁を、先端に充填ノズルをそれぞれ設け、更に、前記液面計の出力を受けて前記圧送ポンプと流量調整弁を制御する充填制御装置を設けて構成し、
    　前記充填制御装置が、
    　複数の前記燃料タンクに同時に燃料を充填する時に、前記燃料タンクへの燃料の充填速度の制御を、前記燃料タンクの個々への充填速度に対してではなく、前記燃料タンク全体への充填速度に対して一括して行うと共に、
    　充填開始時には、前記燃料タンク全体への充填速度を第１充填速度とし、
    　次に、前記燃料タンクの一つの燃料充填量がこの燃料タンクの予め設定した減速用充填量に到達したときに、前記燃料タンク全体への充填速度を供給停止時の衝撃波が問題にならない第２充填速度まで減速させ、
    　前記一つ目の燃料タンクの燃料充填量がこの燃料タンクの予め設定した停止用充填量に到達したときに、前記一つ目の燃料タンクの充填のみを停止させる制御を行うことを特徴とするＤＭＥ燃料の燃料タンクへの燃料充填システム。     In a fuel filling system for a DME fuel tank for a vehicle equipped with a DME fuel engine and a plurality of fuel tanks for DME fuel,
    On the vehicle side, a liquid level gauge for detecting the fuel filling amount is provided in each of the fuel tanks,
    A fuel supply line connecting the storage tank and the fuel tank is provided on the fuel stand side, a pressure feed pump and a flow rate adjusting valve are provided in the middle of the fuel supply line, a filling nozzle is provided at the tip, and the output of the liquid level gauge is further provided. And a filling control device for controlling the pressure-feed pump and the flow rate adjustment valve.
    The filling control device comprises:
    When simultaneously filling a plurality of fuel tanks, control of the fuel filling speed to the fuel tank is not performed to the filling speed of each of the fuel tanks, but to the filling speed of the entire fuel tank. For all at once,
    At the start of filling, the filling speed of the entire fuel tank is set as the first filling speed,
    Next, when one fuel filling amount of the fuel tank reaches a preset filling amount for deceleration of the fuel tank, a shock wave at the time of stopping the supply of the filling speed to the whole fuel tank is not a second problem. Decelerate to filling speed,
    When the fuel filling amount of the first fuel tank reaches a preset filling amount for stoppage of the fuel tank, control for stopping only filling of the first fuel tank is performed. A fuel filling system for a fuel tank of DME fuel.
  4. 　前記充填制御装置が、
    　前記燃料タンクの一つで燃料の充填が停止した後、前記燃料タンク全体への充填速度を第３充填速度に増速し、
    　次に、前記燃料タンクの二つ目の燃料充填量がこの燃料タンクの減速用充填量に到達したときに、前記燃料タンク全体への充填速度を第４充填速度まで減速させ、
    　前記二つ目の燃料タンクの燃料充填量がこの燃料タンクの停止用充填量に到達したときに、前記二つ目の燃料タンクの充填のみを停止させる制御を行うことを特徴とする請求項３に記載のＤＭＥ燃料の燃料タンクへの燃料充填システム。     The filling control device comprises:
    After filling of fuel in one of the fuel tanks is stopped, the filling speed of the whole fuel tank is increased to a third filling speed,
    Next, when the second fuel filling amount of the fuel tank reaches the deceleration filling amount of the fuel tank, the filling speed of the entire fuel tank is reduced to the fourth filling speed,
    4. The control for stopping only the filling of the second fuel tank when the fuel filling amount of the second fuel tank reaches the filling amount for stopping the fuel tank is performed. The fuel filling system to the fuel tank of DME fuel described in 1.
  5. 　前記液面計を、液面が指定の液面に達したことを検出するとＯＮ－ＯＦＦする接点スイッチと、該接点スイッチと並列に設けられる電気抵抗を備えて、液面が前記指定の液面レベルに達するまでは前記接点スイッチがＯＮで、電気抵抗値が略ゼロの状態となり、液面が前記指定の液面レベルに達したことを検出すると前記接点スイッチがＯＦＦとなり、前記電気抵抗値の値が略ゼロの状態から変化するように形成すると共に、
    　前記液面計を直列に連結して、燃料タンク全体としての液面検出用の電気回路とし、該電気回路における電気抵抗の変化から前記燃料タンクの燃料充填量が前記減速用充填量に到達したことを検出することを特徴とする請求項３又は４に記載のＤＭＥ燃料の燃料タンクへの燃料充填システム。     The liquid level gauge includes a contact switch that turns on and off when it detects that the liquid level has reached a specified liquid level, and an electric resistance provided in parallel with the contact switch, and the liquid level is the specified liquid level. Until the level is reached, the contact switch is ON and the electric resistance value is substantially zero, and when the liquid level reaches the specified liquid level, the contact switch is turned OFF and the electric resistance value While forming the value to change from a substantially zero state,
    The liquid level gauge is connected in series to form an electric circuit for detecting the liquid level of the entire fuel tank, and the fuel filling amount of the fuel tank reaches the deceleration filling amount from a change in electric resistance in the electric circuit. The fuel filling system for a fuel tank of DME fuel according to claim 3 or 4, wherein the fuel is detected.
PCT/JP2012/075597 2011-10-13 2012-10-03 Method of filling fuel tank with dme fuel, and fuel filling system WO2013054704A1 (en)

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