JPH0893912A - Automatic transmission for industrial vehicle - Google Patents

Automatic transmission for industrial vehicle

Info

Publication number
JPH0893912A
JPH0893912A JP6229195A JP22919594A JPH0893912A JP H0893912 A JPH0893912 A JP H0893912A JP 6229195 A JP6229195 A JP 6229195A JP 22919594 A JP22919594 A JP 22919594A JP H0893912 A JPH0893912 A JP H0893912A
Authority
JP
Japan
Prior art keywords
vehicle speed
gear
vehicle
transmission
acceleration
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP6229195A
Other languages
Japanese (ja)
Inventor
Seiichi Shimokawabe
誠一 下河辺
Masayuki Yamamuro
正之 山室
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Komatsu Forklift KK
Original Assignee
Komatsu Forklift KK
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Komatsu Forklift KK filed Critical Komatsu Forklift KK
Priority to JP6229195A priority Critical patent/JPH0893912A/en
Publication of JPH0893912A publication Critical patent/JPH0893912A/en
Pending legal-status Critical Current

Links

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  • Control Of Transmission Device (AREA)

Abstract

PURPOSE: To eliminate the sudden happening of engine brake for preventing an accident in traveling from inducement by stopping the change-over of gears of a transmission when the presence of abrupt change in vehicle speed data from a vehicle speed sensor is judged. CONSTITUTION: A controller 9 for an automatic transmission receives vehicle data from a vehicle sensor 11 at a specific interval time (ΔT) to figure out a difference between the present vehicle speed data and previous vehicle speed data, i.e., the variation (ΔV) of the vehicle speed. Also, the acceleration (ΔV/ΔT) of the vehicle speed is figured out of the variation and interval time. Further, the then acceleration of the vehicle speed is compared with predetermined set value (K). When the acceleration (ΔV/ΔT>K) of the vehicle speed exceeding the set value is figured out, the generation of the abrupt change of the vehicle speed, i.e., abnormalities is judged to output an alarming signal and operate an alarm 12. Also, at the same time, a gear change-over stopping signal is outputted to a drive circuit 10 to controllably stop the change-over of the gear 5 of the transmission 3.

Description

【発明の詳細な説明】Detailed Description of the Invention

【0001】[0001]

【産業上の利用分野】本発明は、フォークリフトトラッ
ク等の産業車両に搭載される車速センサーからの車速デ
ータを基にコントローラでギヤを選択して車速に応じた
ギヤに自動的に切換えるようになる産業車両の自動変速
装置に関する。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention allows a controller to select a gear based on vehicle speed data from a vehicle speed sensor mounted on an industrial vehicle such as a forklift truck and automatically switch to a gear corresponding to the vehicle speed. The present invention relates to an automatic transmission for an industrial vehicle.

【0002】[0002]

【従来の技術】従来、フォークリフトトラック等の産業
車両においては、エンジンの出力がトルクコンバータ及
び変速機を介して駆動輪へ伝達され、該駆動輪が回転さ
れて走行するようになっており、前記変速機には各速度
段にギヤが設けられていた。そして、このようなフォー
クリフトトラック等の産業車両に搭載される自動変速装
置としては、車速センサーが設けられ、該車速センサー
からの車速データを基にコントローラで変速機のギヤを
選択して車速に応じたギヤに自動的に切換えるようにな
っていた。
2. Description of the Related Art Conventionally, in an industrial vehicle such as a forklift truck, an engine output is transmitted to a drive wheel via a torque converter and a transmission, and the drive wheel is rotated to travel. The transmission was provided with gears at each speed stage. A vehicle speed sensor is provided as an automatic transmission device mounted on an industrial vehicle such as a forklift truck, and a controller selects a gear of the transmission based on vehicle speed data from the vehicle speed sensor to respond to the vehicle speed. It was supposed to automatically switch to the gear.

【0003】[0003]

【発明が解決しようとする課題】従来の産業車両の自動
変速装置にあっては、車速センサーの故障あるいは断線
等が発生すると、コントローラにおいて車速を0、すな
わち走行停止と判断して、変速機のギヤを低速側のギヤ
に切換えるようになっていた。このため、走行時、特に
高速走行時であると急激なエンジンブレーキが発生する
ことで、車体にエンジンブレーキによる大きなショック
が生じ、走行時に事故を誘発する恐れがあると共に、変
速機のギヤ等に過負荷が生じて、変速機が破損する恐れ
があった。本発明は、これらの問題を解消することをそ
の課題としている。
In the conventional automatic transmission of an industrial vehicle, when a failure or disconnection of the vehicle speed sensor occurs, the controller determines that the vehicle speed is 0, that is, the vehicle is stopped, and the transmission of the transmission is stopped. It was supposed to change the gear to the low speed gear. Therefore, when driving, especially during high-speed driving, sudden engine braking may occur, causing a large shock to the vehicle body due to engine braking, which may lead to an accident during driving. There was a risk of damage to the transmission due to overload. An object of the present invention is to solve these problems.

【0004】[0004]

【課題を解決するための手段】車速センサーからの車速
データを基にコントローラで変速機のギヤを選択して車
速に応じたギヤに自動的に切換えるようになる産業車両
の自動変速装置において、前記コントローラで、車速セ
ンサーからの車速データに急激な変化があると判断する
と、変速機のギヤの切換えを停止するようにする。
An automatic transmission device for an industrial vehicle, wherein a controller selects a gear of a transmission based on vehicle speed data from a vehicle speed sensor and automatically switches to a gear corresponding to the vehicle speed. When the controller determines that there is a sudden change in the vehicle speed data from the vehicle speed sensor, the gear change of the transmission is stopped.

【0005】[0005]

【作 用】本発明は、コントローラで車速センサーか
らの車速データに急激な変化があると判断すると、変速
機のギヤの切換えを停止するようにしたことで、走行中
に車速センサーの故障あるいは断線等が発生した際、コ
ントローラにおいて車速を0すなわち走行停止と判断し
ても変速機のギヤを低速側のギヤに切換えないようにす
る。
[Operation] According to the present invention, when the controller determines that there is a sudden change in the vehicle speed data from the vehicle speed sensor, the gear change of the transmission is stopped, so that the vehicle speed sensor fails or is disconnected during traveling. When such a situation occurs, even if the controller determines that the vehicle speed is 0, that is, the traveling is stopped, the gear of the transmission is not switched to the low speed gear.

【0006】[0006]

【実 施 例】フォークリフトトラック等の産業車両と
しては、従来と同様、図1に示すように、エンジン1の
出力をトルクコンバータ2及び変速機3を介して駆動輪
4へ伝達し、該駆動輪4を回転して走行するようになっ
ている。そして、前記変速機3には各速度段ごとにギヤ
5及び油圧クラッチ6をそれぞれ設けており、該油圧ク
ラッチ6には油圧ポンプ7より各制御弁8を介して圧油
が供給されるようになっている。一方、前記制御弁8は
コントローラ9の出力側に接続した駆動回路10で制御
されるようになっている。このように油圧ポンプ7から
の圧油が制御弁8に流れ、そして油圧クラッチ6に供給
されることで、変速機3のギヤ5がエンジン1からの出
力を受けて作動するようになっている。
Example As an industrial vehicle such as a forklift truck, the output of the engine 1 is transmitted to the drive wheels 4 via the torque converter 2 and the transmission 3 as shown in FIG. 4 is rotated to run. Further, the transmission 3 is provided with a gear 5 and a hydraulic clutch 6 for each speed stage, so that hydraulic oil is supplied to the hydraulic clutch 6 from a hydraulic pump 7 via each control valve 8. Has become. On the other hand, the control valve 8 is controlled by a drive circuit 10 connected to the output side of the controller 9. In this way, the pressure oil from the hydraulic pump 7 flows to the control valve 8 and is supplied to the hydraulic clutch 6, so that the gear 5 of the transmission 3 operates by receiving the output from the engine 1. .

【0007】そして、このような産業車両に搭載される
自動変速装置としては、車速センサー11を変速機3の
出力側に設け、該車速センサー11から車速データをコ
ントローラ9に伝えるようにすると共に、コントローラ
9において車速データを基に予め記憶されている車速に
応じたギヤ5のデータからギヤ5を選択し、この選択し
たギヤ5のデータを駆動回路10に出力して、駆動回路
10において選択したギヤ5に対応する制御弁8を作動
して選択したギヤ5を作動する、すなわち変速機3のギ
ヤ5の切換えを行うようにしている。
As an automatic transmission mounted on such an industrial vehicle, a vehicle speed sensor 11 is provided on the output side of the transmission 3, and vehicle speed data is transmitted from the vehicle speed sensor 11 to the controller 9. Based on the vehicle speed data in the controller 9, the gear 5 is selected from the data of the gear 5 stored in advance according to the vehicle speed, the data of the selected gear 5 is output to the drive circuit 10 and selected in the drive circuit 10. The control valve 8 corresponding to the gear 5 is operated to operate the selected gear 5, that is, the gear 5 of the transmission 3 is switched.

【0008】そして、このような自動変速装置における
コントローラ9においては、常に車速の加速度を監視す
るようにしており、これは、車速センサー11より所定
の間隙時間(ΔT)で車速データを受け、今回の車速デ
ータと前回の車速データとの差すなわち車速の変化量
(ΔV)を算出し、この車速の変化量と間隙時間とから
車速の加速度(ΔV/ΔT)を算出するようにしてい
る。そして、この車速の加速度において、予め設定値
(K)を設定し、この設定値を超えた車速の加速度(Δ
V/ΔT>K)を算出すると、コントローラ9において
急激な変化すなわち異常と判断して、警報信号を出力し
て警報器12を作動しオペレータに異常を知らせると共
に、駆動回路10にギヤ切換え停止信号を出力して変速
機3のギヤ5の切換えを停止するようにしている。
Then, the controller 9 in such an automatic transmission constantly monitors the acceleration of the vehicle speed, which receives vehicle speed data from the vehicle speed sensor 11 at a predetermined gap time (ΔT). The difference between the vehicle speed data and the previous vehicle speed data, that is, the vehicle speed change amount (ΔV) is calculated, and the vehicle speed acceleration (ΔV / ΔT) is calculated from the vehicle speed change amount and the gap time. At this vehicle speed acceleration, a set value (K) is set in advance, and the vehicle speed acceleration (Δ
When V / ΔT> K) is calculated, the controller 9 judges that there is a sudden change, that is, an abnormality, and outputs an alarm signal to activate the alarm 12 to notify the operator of the abnormality, and also to the drive circuit 10 a gear change stop signal. Is output to stop switching of the gear 5 of the transmission 3.

【0009】これを、図2に示したフローチャートにそ
って説明すると、コントローラ9においては、まず、レ
ジスタV2に格納した前回の車速データをレジスタV1
に移動し、次に車速センサー11からの車速データを読
み込む。そして、この車速データをレジスタV2に格納
し、次にレジスタV2に格納した車速データとレジスタ
V1に格納した前回の車速データとの差、すなわち車速
の変化量ΔVを算出し、この車速の変化量ΔVと間隙時
間ΔTとから車速の加速度ΔV/ΔTを算出して、これ
が設定値Kを超えているかどうかを判断する。そして、
超えていると判断すると、ギヤ切換え停止信号を出力
し、さらに警報信号を出力するようになる。また、超え
ていないと判断すると、再び同様の手順を繰り返すよう
になる。
This will be described with reference to the flow chart shown in FIG. 2. In the controller 9, first, the previous vehicle speed data stored in the register V2 is stored in the register V1.
Then, the vehicle speed data from the vehicle speed sensor 11 is read. Then, the vehicle speed data is stored in the register V2, the difference between the vehicle speed data stored in the register V2 and the previous vehicle speed data stored in the register V1, that is, the vehicle speed change amount ΔV is calculated, and the vehicle speed change amount is calculated. The acceleration ΔV / ΔT of the vehicle speed is calculated from ΔV and the gap time ΔT, and it is determined whether or not this exceeds the set value K. And
When it is determined that the number of gears is exceeded, a gear change stop signal is output and an alarm signal is further output. Also, if it is determined that the number has not exceeded, the same procedure is repeated again.

【0010】なお、前述の車速の加速度における設定値
Kの設定としては、車速センサー11より車速データを
受ける間隙時間ΔTを0.1sとすると、この間隙時間
(0.1s)において通常では有り得ない車速の加速度
となるような値でかつできるだけ小さい値とすれば良
く、例えば設定値Kを50m/s2 とする。すると、こ
の設定値Kにおける車速の加速度において、その速度の
変化量ΔVは、 50×0.1×(60×60)/103 =18km/h となり、0.1sで18km/hもの速度の変化が生じ
たことになる。また、車速の加速度(50m/s2 )を
換算すると、 50×(1/9.8)=約5.1G となり、フォークリフトトラック等の産業車両におい
て、通常5.1Gもの加速度が生じることは有り得な
い。このように産業車両において通常では有り得ない車
速の加速度となるような値に設定値Kを設定するように
している。
As for the setting of the set value K in the acceleration of the vehicle speed, assuming that the gap time ΔT for receiving the vehicle speed data from the vehicle speed sensor 11 is 0.1 s, this gap time (0.1 s) normally cannot occur. The value may be an acceleration of the vehicle speed and a value as small as possible. For example, the set value K is 50 m / s 2 . Then, in the acceleration of the vehicle speed at the set value K, the change amount ΔV of the speed becomes 50 × 0.1 × (60 × 60) / 10 3 = 18 km / h, and the speed of 18 km / h can be obtained in 0.1 s. A change has occurred. In addition, when converting the vehicle speed acceleration (50 m / s 2 ), 50 × (1 / 9.8) = approximately 5.1 G, and it is possible that an industrial vehicle such as a forklift truck will normally have an acceleration of 5.1 G. Absent. In this way, the set value K is set to a value that gives an acceleration of the vehicle speed that is not normally possible in an industrial vehicle.

【0011】このように自動変速装置において、車速の
加速度が設定値を超えると、コントローラ9において急
激な変化すなわち異常と判断し、警報器12を作動する
と共に、変速機3のギヤ5の切換えを停止するようにな
る。これにより、車速センサー11の故障あるいは断線
等が発生した際、コントローラ9においては、車速を0
すなわち停止と判断するが、これと共に車速データに急
激な変化があったと判断することで、変速機3のギヤ5
の切換えを行わない。よって、走行時、変速機3のギヤ
5が低速側のギヤ5に切換わるといったことがなくな
り、急激なエンジンブレーキが発生するのを防止するこ
とで、車体にエンジンブレーキによる大きなショックが
生じて事故を誘発するといったことを防止すると共に、
変速機3のギヤ5等に過負荷が生じて変速機3が破損す
るといったことを防止することができる。
As described above, in the automatic transmission, when the acceleration of the vehicle speed exceeds the set value, the controller 9 judges that there is a sudden change, that is, an abnormality, activates the alarm 12, and switches the gear 5 of the transmission 3. It will come to a stop. As a result, when the vehicle speed sensor 11 is broken or disconnected, the controller 9 sets the vehicle speed to zero.
That is, although it is determined that the vehicle is stopped, the gear 5 of the transmission 3 is determined by determining that there is a rapid change in the vehicle speed data.
Is not switched. Therefore, when traveling, the gear 5 of the transmission 3 is not switched to the low speed gear 5, and a sudden engine brake is prevented from occurring, so that a large shock due to the engine brake is generated in the vehicle body to cause an accident. And prevent it from triggering
It is possible to prevent the transmission 3 from being damaged due to an overload on the gear 5 and the like of the transmission 3.

【0012】[0012]

【発明の効果】本発明は、コントローラで車速センサー
からの車速データに急激な変化があると判断すると、変
速機のギヤの切換えを停止するようにしたことで、走行
中に車速センサーの故障あるいは断線等が発生した際、
コントローラにおいて車速を0すなわち走行停止と判断
しても変速機のギヤを低速側のギヤに切換えないように
することができ、これによる急激なエンジンブレーキの
発生をなくして、走行時の事故を誘発するのを防止する
ことができると共に、変速機のギヤ等の破損も防止する
ことができる。
According to the present invention, when the controller determines that the vehicle speed data from the vehicle speed sensor changes abruptly, switching of the gears of the transmission is stopped, so that the vehicle speed sensor is not damaged during traveling. When a disconnection occurs,
Even if the controller determines that the vehicle speed is 0, that is, the vehicle is stopped, the gear of the transmission can be prevented from being switched to the low speed gear, so that sudden engine braking is not generated and an accident during traveling is induced. It is possible to prevent this from occurring and also to prevent damage to the gears of the transmission.

【図面の簡単な説明】[Brief description of drawings]

【図1】本発明の産業車両の自動変速装置の説明図。FIG. 1 is an explanatory diagram of an automatic transmission for an industrial vehicle according to the present invention.

【図2】本発明の産業車両の自動変速装置におけるフロ
ーチャート図。
FIG. 2 is a flowchart of the automatic transmission for an industrial vehicle according to the present invention.

【符号の説明】[Explanation of symbols]

1…エンジン、2…トルクコンバータ、3…変速機、4
…駆動輪、5…ギヤ、6…油圧クラッチ、7…油圧ポン
プ、8…制御弁、9…コントローラ、10…駆動回路、
11…車速センサー、12…警報器。
1 ... Engine, 2 ... Torque converter, 3 ... Transmission, 4
... drive wheels, 5 ... gears, 6 ... hydraulic clutch, 7 ... hydraulic pump, 8 ... control valve, 9 ... controller, 10 ... drive circuit,
11 ... Vehicle speed sensor, 12 ... Alarm device.

Claims (2)

【特許請求の範囲】[Claims] 【請求項1】 車速センサー11からの車速データを基
にコントローラ9で変速機3のギヤ5を選択して車速に
応じたギヤ5に自動的に切換えるようになる産業車両の
自動変速装置において、 前記コントローラ9で、車速センサー11からの車速デ
ータに急激な変化があると判断すると、変速機3のギヤ
5の切換えを停止するようにしたことを特徴とする産業
車両の自動変速装置。
1. An automatic transmission for an industrial vehicle, wherein a controller 9 selects a gear 5 of a transmission 3 on the basis of vehicle speed data from a vehicle speed sensor 11 to automatically switch to a gear 5 according to a vehicle speed. An automatic transmission device for an industrial vehicle, characterized in that, when the controller 9 determines that the vehicle speed data from the vehicle speed sensor 11 has a rapid change, the switching of the gear 5 of the transmission 3 is stopped.
【請求項2】 前記コントローラ9において、車速セン
サ11からの車速データを基に車速の加速度を算出し、
この車速の加速度が設定値を超えた場合、急激な変化で
あると判断するようにしたことを特徴とする請求項1記
載の産業車両の自動変速装置。
2. The controller 9 calculates the acceleration of the vehicle speed based on the vehicle speed data from the vehicle speed sensor 11,
The automatic transmission apparatus for an industrial vehicle according to claim 1, wherein when the acceleration of the vehicle speed exceeds a set value, it is determined that the vehicle speed is abruptly changed.
JP6229195A 1994-09-26 1994-09-26 Automatic transmission for industrial vehicle Pending JPH0893912A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP6229195A JPH0893912A (en) 1994-09-26 1994-09-26 Automatic transmission for industrial vehicle

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP6229195A JPH0893912A (en) 1994-09-26 1994-09-26 Automatic transmission for industrial vehicle

Publications (1)

Publication Number Publication Date
JPH0893912A true JPH0893912A (en) 1996-04-12

Family

ID=16888305

Family Applications (1)

Application Number Title Priority Date Filing Date
JP6229195A Pending JPH0893912A (en) 1994-09-26 1994-09-26 Automatic transmission for industrial vehicle

Country Status (1)

Country Link
JP (1) JPH0893912A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009127828A (en) * 2007-11-28 2009-06-11 Nissan Motor Co Ltd Vehicle shift control device
CN103244665A (en) * 2012-02-14 2013-08-14 福特全球技术公司 Method and system for detecting door state and door sensor failures

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009127828A (en) * 2007-11-28 2009-06-11 Nissan Motor Co Ltd Vehicle shift control device
CN103244665A (en) * 2012-02-14 2013-08-14 福特全球技术公司 Method and system for detecting door state and door sensor failures
CN103244665B (en) * 2012-02-14 2016-07-06 福特全球技术公司 For detecting vehicle door status and the method and system of door sensor fault

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