JP2007237877A - Safety device of tank lorry - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a safety device of a tank lorry capable of improving safety when liquefied gas is transported from the tank lorry to a reservoir, by carrying out control while correlating operating/stopping states of an engine and a liquid sending means with each other. <P>SOLUTION: The safety device of the tank lorry is provided with a switch position detecting means detecting a position of an ignition key switch of the tank lorry, and a liquid controlling means controlling the operation of the liquid sending means equipped with a pump or a gas compressor. The liquid controlling means allows the liquid sending means to operate only when the switch position detecting means detects the position of the ignition key switch is an OFF position. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a safety device for a tank lorry, and in particular, a liquefied gas, in particular, a flammable liquefied gas such as liquefied natural gas (LNG) or liquefied petroleum gas (LPG), is transported to a storage tank of a supply destination. The present invention relates to a safety device for a tank lorry that is pumped by liquid feeding means having a gas compressor.

  When transferring LPG to a storage tank of a supply destination as a tank truck for conveying a flammable liquefied gas, for example, LPG, the tank storage tank of the tank truck and the storage tank of the supply destination are connected by a hose via a liquid supply means, and the supply destination There is known a power supply for supplying power to a pump or a gas compressor driving motor constituting a liquid feeding means by connecting an outlet plug to the power supply. In such a tank lorry, if the engine is operated when the liquid feeding means is operated to transfer LPG from the tank lorry to the storage tank, there is a risk of ignition to the LPG. Is required to stop the engine.

On the other hand, as a safety device in a tank lorry, when the door of the valve instrument box is open, that is, when the LPG is being transferred, a brake device is operated on all wheels to prevent the tank lorry from starting (for example, Patent Literature 1) and a safety device (for example, see Patent Document 2) in which the liquid feeding means (liquid unloading means) is driven by a signal from the remote control means and the tank lorry door is locked. ing.
JP 2001-206135 A JP 2005-306084 A

  However, even with tank trucks equipped with these safety devices, the engine is stopped and operated when the flammable liquefied gas is transferred because the operation and stop of the engine and the operation and stop of the liquid feeding means are performed artificially. Forgetting to do so may cause the liquid feeding means to operate, or forgetting that the liquid feeding means is in operation, and starting the engine. There was also a risk of leaving.

  Therefore, the present invention provides a tank lorry safety device capable of improving safety when transferring liquefied gas from a tank lorry to a storage tank by controlling the operation and stop state of the engine and the liquid feeding means in relation to each other. The purpose is that.

  In order to achieve the above object, the tank lorry safety device of the present invention is a tank lorry safety device provided with a liquid feeding means for delivering a loaded liquefied gas, and a switch position detecting means for detecting the position of an ignition key switch of the tank lorry. And a liquid feed control means for controlling the operation of the liquid feed means, the liquid feed control means only when the switch position detecting means detects that the position of the ignition key switch is in the OFF position. The liquid feeding means is in an operable state.

  The tank lorry safety device of the present invention further includes power supply determination means for determining whether or not power is supplied to drive the liquid feeding means, and vehicle body side power supply control means for controlling the engine of the tank lorry. The power control means makes the engine operable when the power supply determining means determines that there is no power supply, and stops the engine when the power supply determining means determines that the power supply is supplied. It is characterized by that.

  According to the tank lorry safety device of the present invention, since the liquid feeding means can be operated only when the ignition key switch is in the OFF position, the liquid feeding means is not operated in the engine operating state (ignition key switch ON position). The engine cannot be operated, and when the ignition key switch is turned to the ACC, ON, or START position other than the OFF position in the operation state of the liquid supply means, the liquid supply means automatically stops and stops the transfer of the liquefied gas. And the liquid feeding means do not enter the operating state at the same time.

  Furthermore, when the power is supplied to the liquid supply means, that is, when the outlet plug is connected to the power source of the liquefied gas supply destination, the engine is automatically stopped if the engine is in operation, When the power is supplied to the means, the engine cannot be started even if the ignition key switch is operated. I can't let you.

  FIG. 1 is a flowchart showing an operation example of the tank lorry safety device according to the present invention using a pump as a liquid feeding means, FIG. 2 is an explanatory diagram of the tank lorry, FIG. 3 is a block diagram showing an example of the safety device, and FIG. 4 is an ignition key. It is explanatory drawing for demonstrating the relationship between the position of a switch, and the presence or absence of the power supply from an outlet plug.

  First, as shown in FIGS. 2 and 3, the tank lorry 11 is provided with a safety device 12 that controls the operation and stop state of the engine and the liquid feeding means in association with each other. The safety device 12 includes an ignition device. Switch position detection means 21 for detecting the position of the key switch 13, liquid supply means, for example, a liquid supply control means 22 for controlling the operation of the pump 14, and power supply determination for determining whether or not power is supplied to drive the pump 14. Means 23 and vehicle body side power supply control means 24 for controlling the power supply of the tank lorry 11 are provided.

  The pump 14 sends out the liquefied gas by operating the pump driving motor with the power supplied from the outlet plug 15 connected to the power supply of the liquefied gas supply destination. This is performed by operating a pump operation switch provided on the pump operation panel 16. As is well known, the engine of the tank lorry 11 is started and stopped by turning the ignition key switch 13 from the ON position to the START position, and starting the engine, and returning the ignition key switch 13 to the OFF position. At the same time, the ignition key can be detached.

  The switch position detecting means 21 detects whether or not the ignition key switch 13 is in the OFF position, and a signal indicating that it is in the OFF position, or a signal indicating that the ignition key switch 13 is in any other ACC position, ON position, or START position. Either one signal or both signals are output to the safety device 12.

  When the safety key 12 receives a signal indicating that the position of the ignition key switch 13 is in the OFF position from the switch position detecting means 21, or the signal indicating that the safety device 12 is in the ACC position, the ON position, or the START position. The pump 14 can be operated when it is not received, and when the liquid feeding control means 22 determines that the pump can be operated, the pump operation switch of the pump operation panel 16 is operated to operate the pump. 14 can be started.

  The power supply discriminating means 23 discriminates that the outlet plug 15 is connected to the power source of the liquefied gas supply destination and supplied with power, or that no power is supplied. When it is determined that the means 23 is in the power supply state and the switch position detecting means 21 detects the OFF position of the ignition key switch 13, the liquid supply control means 22 determines that the pump 14 can be operated.

  When the vehicle body side power supply control unit 24 determines that the power supply determination unit 23 is in the power supply state, the vehicle body side power supply control unit 24 does not change the current to the vehicle body side wiring 13a even if the ignition key switch 13 is switched to the ACC position, the ON position, or the START position. Cut off. Furthermore, when the outlet plug 15 is connected to the power supply while the ignition key switch 13 is in the ON position and the power supply determination means 23 determines that the power supply state has been established, the vehicle body side power supply control means 24 stops the engine. Let In this embodiment, the vehicle body side power supply control means 24 and the switch position detection means 21 are integrated.

  The safety device 12 determines whether or not the pump 14 can be operated and whether or not the engine of the tank lorry 11 can be operated according to the procedure shown in FIG. First, in step 101, the position of the ignition key switch 13 is determined based on the signal from the switch position detecting means 21. If it is determined in step 101 that the ignition key switch 13 is in the OFF position, the process proceeds to step 102 where the power supply determination means 23 determines whether or not power is supplied from the outlet plug 15. If it is determined in step 102 that there is no power supply, the process returns to step 101. If it is determined that there is power supply, the process proceeds to step 103, where the liquid supply control means 22 determines that the liquid supply means can be operated and the pump operation panel 16 The pump 14 can be started by opening an operation circuit to the pump operation switch and turning on the pump operation switch. During the operation of the pump 14, the operation of the pump 14 can be continued by repeating Step 101, Step 102, and Step 103.

  If it is determined in step 101 that the ignition key switch 13 is in the ACC position other than the OFF position, the ON position, or the START position, the process proceeds to step 104, and the presence or absence of power supply is determined as in step 102. . If it is determined in step 104 that there is no power supply, the process proceeds to step 105, where the vehicle body side power supply control means 24 opens the operation circuit to the vehicle body side wiring 13a in the ignition key switch 13, and the ignition key switch 13 is moved to the START position. Thus, the engine can be started and the tank truck 11 can be started.

  On the other hand, when it is determined in step 104 that there is power supply, the process proceeds to step 106 where the liquid supply control means 22 determines that the liquid supply means cannot be operated and cuts the operation circuit to the pump operation switch of the pump operation panel 16. Thereby, even if the pump operation switch of the pump operation panel 16 is turned on, the pump 14 cannot be started, and the pump 14 is stopped when the pump 14 is in operation. Further, in step 107, the vehicle body side power supply control means 24 cuts the operation circuit to the vehicle body side wiring 13a in the ignition key switch 13, and the vehicle body side wiring is made even if the ignition key switch 13 is set to the ACC position, ON position or START position. When the current to 13a is cut off, the engine cannot be started, and the engine is stopped if the engine is in operation.

  In this way, by confirming the position of the ignition key switch 13 in step 101 and confirming the power supply from the outlet plug 15 in steps 102 and 104, as shown in FIG. 4, the ignition key switch 13 is in the OFF position. In addition, the pump 14 can be operated only when the power supply from the outlet plug 15 is supplied, and the engine is started by operating the ignition key switch 13 only when the power supply from the outlet plug 15 is not supplied. It becomes possible.

  Accordingly, the liquid supply means cannot be operated during engine operation, and the engine cannot be operated during power supply (power reception). Therefore, the LPG is ignited when the LPG loaded on the tank truck is transferred to the supply destination storage tank. Therefore, it is possible to improve the safety when transferring liquefied gas, particularly flammable gas, from the tank truck to the storage tank.

  In the above description, the example in which the power supply determination unit and the vehicle body side power supply control unit are added to improve safety has been described. However, only the operation of the pump is controlled by the switch position detection unit and the liquid feeding control unit. But the effect of improving safety is obtained. Moreover, since only a simple electric circuit and determination means are loaded, it can be easily applied to a tank truck in use. Further, a gas compressor may be used as the liquid feeding means instead of the pump.

It is a flowchart which shows the operation example in the safety device of the tank lorry of this invention. It is explanatory drawing of a tank truck. It is a block diagram which shows an example of a safety device. It is explanatory drawing for demonstrating the relationship between the position of an ignition key switch, and the presence or absence of the power supply from an outlet plug.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 11 ... Tank truck, 12 ... Safety device, 13 ... Ignition key switch, 13a ... Car body side wiring, 14 ... Pump, 15 ... Outlet plug, 16 ... Pump operation panel, 21 ... Switch position detection means, 22 ... Liquid feeding control means, 23 ... Power supply discriminating means, 24 ... Vehicle side power control means

Claims (2)

  In a tank lorry safety device provided with a liquid delivery means for delivering a loaded liquefied gas, a switch position detection means for detecting the position of an ignition key switch of the tank lorry, and a liquid delivery control means for controlling the operation of the liquid delivery means, The liquid supply control means makes the liquid supply means operable only when the switch position detection means detects that the position of the ignition key switch is in the OFF position. Tank lorry safety device.   A power supply determining means for determining whether or not a power supply for driving the liquid feeding means is supplied; and a vehicle body-side power control means for controlling the engine of the tank lorry. 2. The tank truck according to claim 1, wherein when the power supply is determined not to be supplied, the engine can be operated, and when the power supply determination unit determines that the power supply is supplied, the engine is stopped or cannot be started. Safety equipment.

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