JP4147771B2 - Vehicle handling / travel control device - Google Patents

Vehicle handling / travel control device Download PDF

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JP4147771B2
JP4147771B2 JP2001396965A JP2001396965A JP4147771B2 JP 4147771 B2 JP4147771 B2 JP 4147771B2 JP 2001396965 A JP2001396965 A JP 2001396965A JP 2001396965 A JP2001396965 A JP 2001396965A JP 4147771 B2 JP4147771 B2 JP 4147771B2
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cargo handling
switch
travel
vehicle
turned
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JP2003191765A (en
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智宏 加藤
理敬 永井
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神鋼電機株式会社
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Description

【０００１】
【発明の属する技術分野】
本発明は、荷役作業および走行を交互に行う空港支援車両などの車両の荷役／走行制御装置に関する。
【０００２】
【従来の技術】
従来の空港支援車両の荷役／走行制御装置として、荷役操作後に荷役／走行切替スイッチ部を走行側に切り替え、続いてシフトレバーを前進または後進に入れて、車両を走行させるものがある。図２はこのような従来の空港支援車両の荷役／走行制御装置を示す回路図である。同図において、１は荷役／走行切替スイッチ部、２はこの荷役／走行切替スイッチ部１の走行操作スイッチ、３は同じく荷役／走行切替スイッチ部１の荷役操作スイッチ、４は走行操作スイッチ２に接続されたシフトレバースイッチ部で、これが前進用スイッチ５および後進用スイッチ６からなる。
【０００３】
また、このシフトレバースイッチ部４の前進用スイッチ５および後進用スイッチ６のそれぞれには、走行用ソレノイドとしての前進用ソレノイド７および後進用ソレノイド８がそれぞれ直列接続されている。そして、走行操作スイッチ２、前進用スイッチ５、後進用スイッチ６および前進用ソレノイド７、後進用ソレノイド８を結ぶ前記回路が、電源（＋；高電源、ＧＮＤ；低電源）間に直列接続されている。また、荷役／走行切替スイッチ部１の荷役操作スイッチ３には各種の複数の荷役用スイッチ９ａ〜９ｎおよび荷役用リレー１０ａ〜１０ｎを含む荷役制御回路１１が、図示のように直列接続されている。具体的には、荷役操作スイッチ３、荷役用スイッチ９ａ〜９ｎおよび荷役用リレー１０ａ〜１０ｎをそれぞれ結ぶ前記回路が、それぞれ電源間に直列接続されている。
【０００４】
このような回路構成の荷役／走行制御装置では、荷役／走行切替スイッチ部１を走行操作スイッチ２がオフ、荷役操作スイッチ３がオンとなるように切り替えることで、この荷役操作スイッチ３に接続された荷役用リレー１０ａ〜１０ｎが荷役用スイッチ９ａ〜９ｎのいずれかのオン操作による電源供給を受けて選択的に付勢され、対応する所定の荷役のための制御動作が行われる。一方、荷役を終えて、荷役／走行切替スイッチ部１を走行操作スイッチ２がオン、荷役操作スイッチ３がオフとなるように切り替え、続いてシフトレバースイッチ部４の前進用スイッチ５または後進用スイッチ６をオン操作した場合には、それぞれに応じて前進用ソレノイド７または後進用ソレノイド８が選択的に付勢される。このため、アクセルの踏み込みとともに車両が前進方向または後進方向に走行を開始する。また、このような走行を停止し、再び荷役を行う際は、荷役／走行切替スイッチ部１を荷役操作スイッチ３がオンとなる方向に切り替え操作することで、前記同様の荷役のための制御動作が行われる。
【０００５】
【発明が解決しようとする課題】
しかしながら、このような従来の車両の荷役／走行制御装置にあっては、オペレータの操作ミスなどによって荷役／走行切替スイッチ部１を走行側（走行操作スイッチ２がオン）に切り替える前に、シフトバーを操作してシフトレバースイッチ部４の前進用スイッチ５および後進用スイッチ６のいずれかをオンにした場合には、その後に、荷役／走行切替スイッチ部１が前記のように切り替えられた際に、車両が意に反して急に前進方向または後進方向に走り出してしまい、事故を惹き起こす場合があるという問題があった。
【０００６】
本発明は前記のような問題を解決するものであり、オペレータが誤ってシフトレバーを操作することにより、シフトレバースイッチ部の前進用スイッチや後進用スイッチがオンとされた状態で荷役／走行切替スイッチ部を走行側に切り替えても、車両の急な走行（急発進）による危険を未然に防止できる車両の荷役／走行制御装置を提供することを目的とする。
【０００７】
【課題を解決するための手段】
前記目的達成のため、請求項１の発明にかかる車両の荷役／走行制御装置は、車両を走行させるために操作される走行操作スイッチと、荷役操作用自己保持リレーの常閉接点と、シフトレバーの操作によってオン・オフされ、車両の走行方向を前後方向に切り替えるシフトレバースイッチ部と、車両を前後方向に走行制御するための走行用ソレノイドとからなる直列回路が電源に接続され、前記シフトレバーがニュートラル位置に入り前記シフトレバースイッチ部がオフになったとき、一時的にオンとなるニュートラルスイッチとニュートラル検出リレーとの直列回路が前記電源に接続され、前記走行操作スイッチに連動する荷役操作スイッチと荷役制御回路との直列回路が前記電源に接続され、前記荷役制御回路に前記荷役操作用自己保持リレーが並列接続され、前記荷役操作スイッチに対し、前記荷役操作用自己保持リレーの常開接点と前記ニュートラル検出リレーの常閉接点との直列回路が並列接続されたことを特徴とする。
【０００８】
これにより荷役操作スイッチのオン操作によって自己保持される荷役操作用自己保持リレーの常閉接点をオフ（開）とすることで、シフトレバーが前進側や後進側に入れられた後に走行操作スイッチがオン操作されても、走行検出リレーが付勢されないようにすることができ、不用意に車両が急発進するのを未然に防止できる。一方、シフトレバーを前進方向や後進方向からニュートラルに戻すことにより、前記荷役操作用自己保持リレーの自己保持を解除することで、走行操作スイッチの操作に続くシフトレバーの操作によって、車両の前進方向や後進方向の走行を可能にする。
【０００９】
【発明の実施の形態】
以下に、本発明の実施の形態を図について説明する。図１はその一実施形態を示す回路図であり、図２に示したものと同一の回路素子には同一符号を付してある。図１において、１２は荷役操作用自己保持リレー、１３はシフトレバーのニュートラル検出リレーであり、荷役操作用自己保持リレー１２は荷役制御回路１１に対して並列接続されている。また、その荷役操作用自己保持リレー１２の常開接点１２ａとニュートラル検出リレー１３の常閉接点１３ａとの直列回路が、荷役操作スイッチ３に対し並列接続されている。
【００１０】
また、荷役操作用自己保持リレー１２の常閉接点１２ｂが走行操作スイッチ２と前進用スイッチ５との間に接続されている。シフトレバースイッチ部４には、前進用スイッチ５および後進用スイッチ６をニュートラル側に戻したときに、これらにそれぞれ連動して一時的にオンとなる各一のニュートラルスイッチ１４、１５が設けられ、スイッチ１４，１５とニュートラル検出リレー１３とが電源（＋，ＧＮＤ）間に直列接続されている。
【００１１】
従って、このような構成の荷役／走行制御装置では、荷役／走行切替スイッチ部１を走行操作スイッチ２がオフ、荷役操作スイッチ３がオンとなるように切り替えることで、この荷役操作スイッチ３に接続された荷役用リレー１０ａ〜１０ｎが、荷役用スイッチ９ａ〜９ｎのいずれかのオン操作による電源供給を受けて選択的に付勢され、対応する所定の荷役のための制御動作が行われる。このとき、荷役操作用自己保持リレー１２にも荷役操作スイッチ３を介して電源が供給され、この荷役操作用自己保持リレー１２の付勢によってこれの常開接続１２ａがオン（閉）となり、常閉接点１２ｂがオフ（開）となる。このため、荷役操作用自己保持リレー１２はその常開接点１２ａおよびニュートラル検出リレー１３の常閉接点１３ａを通じて電源から電流を受けて自己保持され、この自己保持中は常開接点１２ａがオン、常閉接点１２ｂがオフの状態を維持する。
【００１２】
一方、車両が荷役を終えて走行する場合には、荷役／走行切り替えスイッチ部１を走行操作スイッチ２がオン、荷役操作スイッチ３がオフとなるように切り替える前に、シフトレバースイッチ部４の前進用スイッチ５または後進用スイッチ６がオン操作されても、常閉接点１２ｂのオフにより、前進用ソレノイド７および後進用ソレノイド８のいずれも消勢状態が維持される。従って、その後、荷役／走行切替スイッチ部１を走行側に切り替えても、車両が急に走り出すことはない。
【００１３】
これに対し、荷役から走行に切り替えるには、シフトレバーをニュートラルに戻し、前進用スイッチ５や後進用スイッチ６をオフにする。このシフトレバーをニュートラルに戻すと、これらの前進用スイッチ５や後進用スイッチ６に連動するニュートラルスイッチ１４、１５のいずれかが一時的にオンとなり、ニュートラル検出リレー１３が電源に接続されて付勢される。このニュートラル検出リレー１３の付勢によって、このニュートラル検出リレー１３の常閉接点１３ａが一時的にオフとなり、これに伴って荷役操作用自己保持リレー１２が消勢される。この結果、この荷役用自己保持リレー１２の常閉接点１２ｂがオンに戻り、常開接点１２ａがオフとなる。
【００１４】
従って、荷役／走行切替スイッチ部１における走行操作スイッチ２をオン操作し、続いてシフトレバースイッチ部４の前進用スイッチ５または後進用スイッチ６をオン操作することにょって、それぞれ前進用ソレノイド７または後進用ソレノイド８のいずれかが付勢され、車両が前進または後進を始めることとなる。このように、車両を荷役動作から走行動作に切り替える場合において、荷役／走行切替スイッチ部１が荷役側から走行側に切り替えられる前に、シフトレバーを前進方向または後進方向の走行側に入れても、前進用ソレノイド７や後進用ソレノイド８の付勢を禁止でき、車両が突然に前進方向または後進方向へ走り出すのを確実に防止できる。
【００１５】
なお、ニュートラル検出リレー１３は、シフトレバーがニュートラルの位置に戻されるときにニュートラルスイッチ１４または１５が一時的にオンとなることにより付勢されて常閉接点１３ａを一時的にオフにし、荷役操作用自己保持リレー１２の自己保持を解除する。このため、常閉接点１３ａはこの短い時間（タイミング）以外ではオン状態を維持し続ける。
【００１６】
【発明の効果】
以上のように、本発明によれば荷役操作スイッチのオン操作によって自己保持される荷役操作用自己保持リレーの常閉接点をオフ（開）とすることで、シフトレバーが前進側や後進側に入れられた後に走行操作スイッチがオン操作された場合でも、走行検出リレーが付勢されないようにすることができ、不用意に車両が急発進するのを防止できる。一方、シフトレバーを前進方向や後進方向からニュートラルに戻すことにより、前記荷役操作用自己保持リレーの自己保持を解除することができ、走行操作スイッチの操作に続くシフトレバーの操作によって、車両を前進方向または後進方向のいずれかに安全に走行させることができる。
【図面の簡単な説明】
【図１】 本発明の実施の形態による車両の荷役／走行制御装置を示す回路図である。
【図２】 従来の車両の荷役／走行制御装置を示す回路図である。
【符号の説明】
２ 走行操作スイッチ
３ 荷役操作スイッチ
４ シフトレバースイッチ部
７ 前進用ソレノイド（走行用ソレノイド）
８ 後進用ソレノイド（走行用ソレノイド）
９ａ〜９ｎ 荷役用スイッチ
１０ａ〜１０ｎ 荷役用リレー
１１ 荷役制御回路
１２ 荷役操作用自己保持リレー
１２ａ 常開接点
１２ｂ 常閉接点
１３ ニュートラル検出リレー
１３ａ 常閉接点
１４、１５ ニュートラルスイッチ[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a cargo handling / travel control device for a vehicle such as an airport support vehicle that alternately performs cargo handling work and travel.
[0002]
[Prior art]
As a conventional cargo handling / running control device for an airport support vehicle, there is one that switches a cargo handling / running changeover switch unit to a running side after a handling operation, and then moves a shift lever forward or backward to run the vehicle. FIG. 2 is a circuit diagram showing such a conventional cargo handling / travel control device for an airport support vehicle. In the figure, 1 is a cargo handling / travel changeover switch section, 2 is a travel operation switch of the cargo handling / travel changeover switch section 1, 3 is a cargo handling operation switch of the cargo handling / travel changeover switch section 1, and 4 is a travel operation switch 2. This is a connected shift lever switch unit, which comprises a forward switch 5 and a reverse switch 6.
[0003]
A forward solenoid 7 and a reverse solenoid 8 as travel solenoids are respectively connected in series to the forward switch 5 and the reverse switch 6 of the shift lever switch unit 4. The circuit connecting the travel operation switch 2, the forward switch 5, the reverse switch 6, the forward solenoid 7, and the reverse solenoid 8 is connected in series between power sources (+; high power source, GND; low power source). Yes. In addition, a cargo handling control circuit 11 including a plurality of various cargo handling switches 9a to 9n and cargo handling relays 10a to 10n is connected in series to the cargo handling operation switch 3 of the cargo handling / travel changeover switch unit 1 as shown in the figure. . Specifically, the circuits connecting the cargo handling operation switch 3, the cargo handling switches 9a to 9n, and the cargo handling relays 10a to 10n are respectively connected in series between the power sources.
[0004]
In the cargo handling / travel control device having such a circuit configuration, the cargo handling / travel switching switch unit 1 is connected to the cargo handling operation switch 3 by switching so that the travel operation switch 2 is turned off and the cargo handling operation switch 3 is turned on. The cargo handling relays 10a to 10n are selectively energized in response to power-on operation of any of the cargo handling switches 9a to 9n, and a corresponding control operation for cargo handling is performed. On the other hand, after the cargo handling is finished, the cargo handling / travel switching switch 1 is switched so that the travel operation switch 2 is turned on and the cargo handling switch 3 is turned off, and then the forward switch 5 or the reverse switch of the shift lever switch 4 When 6 is turned on, the forward solenoid 7 or the reverse solenoid 8 is selectively energized correspondingly. For this reason, the vehicle starts traveling in the forward direction or the reverse direction as the accelerator is depressed. Further, when such traveling is stopped and the cargo handling is performed again, the cargo handling / running changeover switch unit 1 is switched in the direction in which the cargo handling operation switch 3 is turned on, thereby performing the same control operation for cargo handling as described above. Is done.
[0005]
[Problems to be solved by the invention]
However, in such a conventional vehicle handling / travel control device, before the load handling / travel changeover switch unit 1 is switched to the travel side (the travel operation switch 2 is on) due to an operator's operation error or the like, the shift bar is When one of the forward switch 5 and the reverse switch 6 of the shift lever switch unit 4 is operated and turned on, when the cargo handling / travel changeover switch unit 1 is switched as described above, There was a problem that the vehicle suddenly started to run in the forward or reverse direction unexpectedly, causing an accident.
[0006]
The present invention solves the above-mentioned problems, and when the operator operates the shift lever by mistake, the cargo handling / travel switching is performed in a state where the forward switch and the reverse switch of the shift lever switch portion are turned on. It is an object of the present invention to provide a vehicle cargo handling / travel control device that can prevent dangers caused by sudden travel (rapid start) of a vehicle even when the switch unit is switched to the travel side.
[0007]
[Means for Solving the Problems]
To achieve the above object, a vehicle handling / traveling control device according to the first aspect of the present invention includes a travel operation switch operated to travel a vehicle, a normally closed contact of a self-holding relay for cargo handling, a shift lever A series circuit comprising a shift lever switch portion that is turned on / off by the operation of the vehicle to switch the traveling direction of the vehicle in the front-rear direction and a traveling solenoid for controlling the traveling of the vehicle in the front-rear direction is connected to a power source, and the shift lever When the shift lever switch section is turned off when the shift lever switch portion is turned off, a series circuit of a neutral switch that is temporarily turned on and a neutral detection relay is connected to the power supply, and a cargo handling operation switch that is linked to the travel operation switch a series circuit of the cargo handling control circuit is connected to the power source, the self-holding the loading operation to said cargo control circuit Laser are connected in parallel, to said loading operation switch, wherein the series circuit of the normally-closed contact of the the normally open contact of the loading operation for the self-holding relay neutral detection relay are connected in parallel.
[0008]
As a result, the normally closed contact of the self-holding relay for cargo handling operation that is self-held by the on-operation of the cargo handling switch is turned off (open), so that the travel operation switch is turned on after the shift lever is moved forward or backward. Even if it is turned on, the travel detection relay can be prevented from being energized, and the vehicle can be prevented from suddenly starting suddenly. On the other hand, by returning the shift lever to the neutral from the forward direction or the reverse direction, the self-holding of the self-holding relay for cargo handling operation is released, so that the forward direction of the vehicle can be increased by operating the shift lever following the operation of the travel operation switch. And allows backward travel.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a circuit diagram showing an embodiment, and the same circuit elements as those shown in FIG. 2 are denoted by the same reference numerals. In FIG. 1, reference numeral 12 denotes a cargo handling operation self-holding relay, 13 denotes a shift lever neutral detection relay, and the cargo handling operation self-holding relay 12 is connected in parallel to the cargo handling control circuit 11. A series circuit of a normally open contact 12 a of the self-holding relay 12 for cargo handling operation and a normally closed contact 13 a of the neutral detection relay 13 is connected in parallel to the cargo handling switch 3.
[0010]
A normally closed contact 12 b of the cargo handling operation self-holding relay 12 is connected between the travel operation switch 2 and the forward switch 5. The shift lever switch portion 4 is provided with one neutral switch 14, 15 that is temporarily turned on in conjunction with the forward switch 5 and the reverse switch 6 when they are returned to the neutral side. Switches 14 and 15 and a neutral detection relay 13 are connected in series between the power supplies (+, GND).
[0011]
Therefore, in the cargo handling / travel control device having such a configuration, the cargo handling / travel switching switch unit 1 is connected to the cargo handling operation switch 3 by switching so that the travel operation switch 2 is turned off and the cargo handling operation switch 3 is turned on. The received cargo handling relays 10a to 10n are selectively energized in response to power-on operation of any of the cargo handling switches 9a to 9n, and a corresponding control operation for cargo handling is performed. At this time, power is also supplied to the cargo handling operation self-holding relay 12 via the cargo handling operation switch 3, and the normally open connection 12a is turned on (closed) by the energization of the cargo handling operation self-holding relay 12. The closed contact 12b is turned off (opened). For this reason, the self-holding relay 12 for cargo handling operation is self-held by receiving a current from the power source through the normally-open contact 12a and the normally-closed contact 13a of the neutral detection relay 13, and the normally-open contact 12a is turned on during this self-holding. The closed contact 12b is kept off.
[0012]
On the other hand, when the vehicle travels after handling, the shift lever switch unit 4 moves forward before switching the handling / travel switching switch unit 1 so that the traveling operation switch 2 is turned on and the cargo handling operation switch 3 is turned off. Even if the switch for reverse 5 or the switch for reverse travel 6 is turned on, both the forward solenoid 7 and the reverse solenoid 8 are maintained in the de-energized state by turning off the normally closed contact 12b. Therefore, after that, even if the cargo handling / travel switching switch 1 is switched to the travel side, the vehicle does not start suddenly.
[0013]
On the other hand, in order to switch from cargo handling to traveling, the shift lever is returned to neutral, and the forward switch 5 and the reverse switch 6 are turned off. When the shift lever is returned to the neutral position, one of the neutral switches 14 and 15 linked to the forward switch 5 and the reverse switch 6 is temporarily turned on, and the neutral detection relay 13 is connected to the power source and energized. Is done. By the energization of the neutral detection relay 13, the normally closed contact 13a of the neutral detection relay 13 is temporarily turned off, and accordingly, the cargo handling operation self-holding relay 12 is deactivated. As a result, the normally closed contact 12b of the cargo handling self-holding relay 12 is turned back on, and the normally open contact 12a is turned off.
[0014]
Accordingly, the forward operation solenoid 2 is turned on by turning on the travel operation switch 2 in the cargo handling / travel changeover switch portion 1 and then turning on the forward switch 5 or the reverse switch 6 of the shift lever switch portion 4. Alternatively, one of the reverse solenoids 8 is energized, and the vehicle starts to move forward or reverse. As described above, when the vehicle is switched from the cargo handling operation to the traveling operation, the shift lever may be put on the traveling side in the forward direction or the backward direction before the cargo handling / travel switching switch unit 1 is switched from the cargo handling side to the traveling side. The energization of the forward solenoid 7 and the reverse solenoid 8 can be prohibited, and the vehicle can be reliably prevented from suddenly starting in the forward direction or the reverse direction.
[0015]
The neutral detection relay 13 is energized when the neutral switch 14 or 15 is temporarily turned on when the shift lever is returned to the neutral position, thereby temporarily turning off the normally closed contact 13a. The self-holding of the self-holding relay 12 is released. For this reason, the normally closed contact 13a keeps the ON state except for this short time (timing).
[0016]
【The invention's effect】
As described above, according to the present invention, by turning off (opening) the normally closed contact of the self-holding relay for cargo handling that is self-held by turning on the cargo handling switch, the shift lever is moved forward or backward. Even when the travel operation switch is turned on after being turned on, the travel detection relay can be prevented from being energized, and the vehicle can be prevented from suddenly starting suddenly. On the other hand, the self-holding of the self-holding relay for cargo handling operation can be released by returning the shift lever to the neutral from the forward direction or the reverse direction, and the vehicle is moved forward by the operation of the shift lever following the operation of the travel operation switch. It is possible to drive safely in either the direction or the reverse direction.
[Brief description of the drawings]
FIG. 1 is a circuit diagram showing a vehicle loading / unloading control apparatus according to an embodiment of the present invention.
FIG. 2 is a circuit diagram showing a conventional cargo handling / travel control device for a vehicle.
[Explanation of symbols]
2 Traveling operation switch 3 Cargo handling switch 4 Shift lever switch 7 Forward solenoid (traveling solenoid)
8 Reverse solenoid (travel solenoid)
9a to 9n Load handling switch 10a to 10n Load handling relay 11 Load handling control circuit 12 Self-holding relay 12a for cargo handling operation Normally open contact 12b Normally closed contact 13 Neutral detection relay 13a Normally closed contacts 14 and 15 Neutral switch

Claims (1)

車両を走行させるために操作される走行操作スイッチと、荷役操作用自己保持リレーの常閉接点と、シフトレバーの操作によってオン・オフされ、車両の走行方向を前後方向に切り替えるシフトレバースイッチ部と、車両を前後方向に走行制御するための走行用ソレノイドとからなる直列回路が電源に接続され、
前記シフトレバーがニュートラル位置に入り前記シフトレバースイッチ部がオフになったとき、一時的にオンとなるニュートラルスイッチとニュートラル検出リレーとの直列回路が前記電源に接続され、
前記走行操作スイッチに連動する荷役操作スイッチと荷役制御回路との直列回路が前記電源に接続され、
前記荷役制御回路に前記荷役操作用自己保持リレーが並列接続され、
前記荷役操作スイッチに対し、前記荷役操作用自己保持リレーの常開接点と前記ニュートラル検出リレーの常閉接点との直列回路が並列接続されたことを特徴とする車両の荷役／走行制御装置。A travel operation switch that is operated to drive the vehicle, a normally closed contact of a self-holding relay for cargo handling operation, a shift lever switch portion that is turned on and off by operation of the shift lever and switches the traveling direction of the vehicle in the front-rear direction; A series circuit comprising a traveling solenoid for controlling the vehicle in the longitudinal direction is connected to the power source,
When the shift lever enters the neutral position and the shift lever switch part is turned off, a series circuit of a neutral switch that is temporarily turned on and a neutral detection relay is connected to the power source,
A series circuit of a cargo handling operation switch and a cargo handling control circuit linked to the travel operation switch is connected to the power source,
The loading operation for the self-holding relay is connected in parallel to the cargo handling control circuit,
A vehicle cargo handling / travel control device, wherein a series circuit of a normally open contact of the self-holding relay for cargo handling and a normally closed contact of the neutral detection relay is connected in parallel to the cargo handling switch.
JP2001396965A 2001-12-27 2001-12-27 Vehicle handling / travel control device Expired - Fee Related JP4147771B2 (en)

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