JP2007218165A

JP2007218165A - Hydraulic device

Info

Publication number: JP2007218165A
Application number: JP2006039265A
Authority: JP
Inventors: Hitomi Iiizumi; 仁美飯泉
Original assignee: Shimadzu Corp
Current assignee: Shimadzu Corp
Priority date: 2006-02-16
Filing date: 2006-02-16
Publication date: 2007-08-30

Abstract

<P>PROBLEM TO BE SOLVED: To provide a hydraulic device protected against burning and welding even if excessive current greater than assumption flows. <P>SOLUTION: In the hydraulic device provided with a hydraulic pump 12, a DC motor 1 driving the hydraulic pump 12, and a tank storing working oil supplied to the hydraulic pump 12, electric potential of an input side A and an output side B of a contactor 14 put between the DC motor 11 and a battery 13 and supplying electric power to the DC motor 11 are measured. Current value flowing through the contactor 14 is calculated based on the electric potential difference. Allowable continuous operation time of the contactor 14 and the DC motor 11 is calculated by an operation device 16 based on the calculated current value and allowable continuous contact capacity of the contactor 14 or allowable continuous contact capacity of the DC motor 11. When continuous operation time exceeds the calculated allowable continuous operation time, contact of the contactor 14 is shut out by a contactor control part 15. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

本発明は、車両用テールゲートリフタや車両用ウイングの制御用に搭載されている油圧装置に関する。 The present invention relates to a hydraulic device mounted for controlling a vehicle tailgate lifter and a vehicle wing.

従来、油圧装置では、大容量の電流を使用するので、車両用バッテリーと油圧装置のコンタクタの溶着及びモータの焼損防止のため、一定時間駆動すると、コンタクタを遮断するタイマー回路を備えている。 2. Description of the Related Art Conventionally, since a large amount of current is used in a hydraulic device, a timer circuit that cuts off the contactor when driven for a certain period of time is provided to prevent welding of the vehicle battery and the contactor of the hydraulic device and to prevent burnout of the motor.

しかしながら、上記タイマー回路を備えただけでは、想定外の過大電流が連続して流れても遮断できず、モータ焼損やコンタクタ溶着保護を確実に行うことができなかった。また、コンタクタの銅損などにより、コンタクタが加熱し、コンタクタ接触抵抗が上がってしまった場合、焼損、溶着に対する保護などができなかった。 However, the provision of the timer circuit cannot be interrupted even if an unexpected excessive current continuously flows, and motor burnout and contactor welding protection cannot be reliably performed. In addition, when the contactor was heated due to the copper loss of the contactor and the contactor contact resistance was increased, it was not possible to protect against burning and welding.

本発明は上記課題を解決し、電流値を算出し、その電流値に応じた連続作動時間を超えた場合、焼損、溶着に対する保護ができる油圧装置を提供することを目的とする。 An object of the present invention is to solve the above-mentioned problems, and to provide a hydraulic device that can protect against burning and welding when a current value is calculated and a continuous operation time corresponding to the current value is exceeded.

上記課題を解決するため、本発明は、少なくとも、油圧ポンプと、該油圧ポンプを駆動するＤＣモータと、該油圧ポンプに供給する作動油を貯留するタンクとを備えた油圧装置において、ＤＣモータとバッテリとの間に介在しＤＣモータに電源供給するコンタクタの入力側と出力側の電位を計測する手段と、その電位差によりコンタクタに流れている電流値を算出する手段と、該算出した電流値とコンタクタの許容連続接点容量及びＤＣモータの許容連続接点容量に基づき、コンタクタ及びＤＣモータの許容連続作動時間を算出する手段と、連続運転時間が該算出した許容連続作動時間を越えた場合、コンタクタの接点を遮断する制御手段を有している。 In order to solve the above problems, the present invention provides a hydraulic apparatus including at least a hydraulic pump, a DC motor that drives the hydraulic pump, and a tank that stores hydraulic oil to be supplied to the hydraulic pump. Means for measuring the potential on the input side and output side of the contactor that is interposed between the battery and supplying power to the DC motor; means for calculating the current value flowing through the contactor by the potential difference; and the calculated current value Based on the allowable continuous contact capacity of the contactor and the allowable continuous contact capacity of the DC motor, means for calculating the allowable continuous operation time of the contactor and the DC motor, and when the continuous operation time exceeds the calculated allowable continuous operation time, Control means for blocking the contact is provided.

本発明では、実際にコンタクタやＤＣモータに流れている電流値を測定してコンタクタ及びＤＣモータの電流値に応じた許容連続作動時間を算出しているので、想定外の過大電流が連続して流れ、許容連続作動時間を越えた時点でコンタクタの接点を遮断し、コンタクタやＤＣモータの焼損、溶着に対する保護ができる。 In the present invention, the current value actually flowing to the contactor or the DC motor is measured, and the allowable continuous operation time corresponding to the current value of the contactor and the DC motor is calculated. When the flow and allowable continuous operation time are exceeded, the contactor contact is interrupted, and the contactor and DC motor can be protected from burning and welding.

図１は、本実施例の油圧装置における自動遮断制御機構に関するブロック図、図２は油圧装置を搭載するテールゲートリフタを有した車両である。 FIG. 1 is a block diagram relating to an automatic shut-off control mechanism in the hydraulic apparatus of the present embodiment, and FIG. 2 is a vehicle having a tailgate lifter on which the hydraulic apparatus is mounted.

ＤＣモータ１１は、油圧ポンプ１２の駆動用モータとして機械的に接続され、油圧ポンプ１２により作動油を図示省略の油圧シリンダ等に供給し、リフタＬ等の荷台５１を昇降するよう構成される。また、ＤＣモータ１１は、バッテリ１３が、コンタクタ１４を介して電気的に接続され、コンタクタ１４を閉じることによりＤＣモータ１１を駆動するための電流が流れるよう電気的回路が構成される。なお、ＤＣモータ１１の一方側は接地される。 The DC motor 11 is mechanically connected as a drive motor for the hydraulic pump 12, and is configured to supply hydraulic oil to a hydraulic cylinder (not shown) or the like by the hydraulic pump 12 and to raise and lower the loading platform 51 such as the lifter L. In addition, the DC motor 11 is electrically connected to the battery 13 via the contactor 14, and an electric circuit is configured such that a current for driving the DC motor 11 flows by closing the contactor 14. Note that one side of the DC motor 11 is grounded.

そして、コンタクタ１４は、コンタクタ制御部１５により開閉が制御されるが、開閉信号が、演算装置１６からこのコンタクタ制御部１５に送られる。 The contactor 14 is controlled to be opened and closed by the contactor control unit 15, and an opening / closing signal is sent from the arithmetic device 16 to the contactor control unit 15.

また、コンタクタ１４の前後のＡ点及びＢ点にはそれぞれ電位が計測されるよう電気的に演算装置と接続されている。しかして、演算装置１６はコンタクタ１４における電圧降下の値をリアルタイムでモニタし、流れている電流値を算出するよう構成されている。 Further, points A and B before and after the contactor 14 are electrically connected to the arithmetic unit so that potentials are measured. Therefore, the arithmetic unit 16 is configured to monitor the value of the voltage drop in the contactor 14 in real time and calculate the value of the flowing current.

さらに、演算装置１６にはコンタクタ１４及びＤＣモータ１１の許容連続接点容量が記憶されており、コンタクタ１４を流れている電流値に応じて、許容連続作動時間が算出されるよう構成される。また、演算装置１６はＤＣモータ１１が作動開始から連続運転を行っている運転時間を計測するタイマー機能も有する。 Further, the arithmetic device 16 stores the allowable continuous contact capacity of the contactor 14 and the DC motor 11, and is configured to calculate the allowable continuous operation time according to the current value flowing through the contactor 14. The arithmetic device 16 also has a timer function for measuring an operation time during which the DC motor 11 has been continuously operated from the start of operation.

このような油圧装置において、リフタＬ等の荷台５１の荷物を上昇する際、コンタクタ１４を閉じることによりバッテリ１３から電力を供給してＤＣモータ１１を駆動し、油圧ポンプ１２を駆動して作動油を吐出する。このとき、リフタＬの荷台５１に過大重量の荷物や作業者が乗った場合、また、動力伝達系に異物が挟み込まれた場合など、ＤＣモータ１１には通常使用時の電流に対して、過大な電流が流れる。 In such a hydraulic device, when lifting the load on the loading platform 51 such as the lifter L, the contactor 14 is closed to supply power from the battery 13 to drive the DC motor 11 and the hydraulic pump 12 to drive the hydraulic oil. Is discharged. At this time, when an excessively heavy load or an operator gets on the platform 51 of the lifter L, or when a foreign object is caught in the power transmission system, the DC motor 11 has an excessive current with respect to the current during normal use. Current flows.

そこで、本実施例の油圧装置は、コンタクタ１４の前後のＡ点及びＢ点で電位を測定し、そのコンタクタ１４における電圧降下を測定することで、演算装置１６では流れている電流値を算出する。さらに演算装置１６には、コンタクタ１４及びＤＣモータ１１の許容連続接点容量が記憶されており、コンタクタ１４を流れている電流値に応じて、コンタクタ１４及びＤＣモータ１１の許容連続作動時間が算出される。 Therefore, the hydraulic device of the present embodiment measures the potential at points A and B before and after the contactor 14 and measures the voltage drop at the contactor 14, thereby calculating the current value flowing through the arithmetic device 16. . Further, the arithmetic device 16 stores the allowable continuous contact capacity of the contactor 14 and the DC motor 11, and the allowable continuous operation time of the contactor 14 and the DC motor 11 is calculated according to the current value flowing through the contactor 14. The

一方、演算装置１６はＤＣモータ１１の運転時間を計測するタイマー機能を有しており、過大電流が流れて通常使用時よりも短い許容連続作動時間に、実際の連続作動時間が達したとき、コンタクタ制御部１５に指令を発することで、コンタクタ１４を開いてＤＣモータ１１を停止する。これによりコンタクタ１４やＤＣモータ１１の焼損、溶着を回避する。 On the other hand, the arithmetic unit 16 has a timer function for measuring the operation time of the DC motor 11, and when the actual continuous operation time reaches the allowable continuous operation time shorter than that during normal use due to excessive current flowing, By issuing a command to the contactor control unit 15, the contactor 14 is opened and the DC motor 11 is stopped. This avoids burning and welding of the contactor 14 and the DC motor 11.

なお、本実施例の油圧装置では、過大電流が所定時間、連続して流れることを監視しているので、過大電流で瞬間的であるため、コンタクタ１４やＤＣモータ１１が許容できる場合、不用意にコンタクタ１４を遮断してＤＣモータ１１の駆動を停止することがなくなり、作業効率を低下させることがない。 In the hydraulic device according to the present embodiment, since the excessive current is continuously monitored for a predetermined time, the excessive current is instantaneous. Therefore, if the contactor 14 or the DC motor 11 is allowable, it is inadvertent. Thus, the contactor 14 is not shut off and the driving of the DC motor 11 is not stopped, and the working efficiency is not lowered.

また、演算装置１６に予め電流値を設定し、それ以上の過大電流が流れたとき、警告ランプを点灯したり、瞬間的であってもコンタクタ１４やＤＣモータ１１に異常をきたす過大な電流値を設定して、コンタクタ１４を遮断したりすることも可能である。 In addition, a current value is set in the arithmetic unit 16 in advance, and when an excessive current exceeds it, a warning lamp is turned on or an excessive current value that causes an abnormality in the contactor 14 or the DC motor 11 even if it is instantaneous. It is also possible to shut off the contactor 14 by setting.

本発明の実施例に係る自動遮断制御機構に関するブロック図。The block diagram regarding the automatic interruption | blocking control mechanism which concerns on the Example of this invention. 本発明の油圧装置を搭載するテールゲートリフタを有した車両を示した図。The figure which showed the vehicle which had the tailgate lifter carrying the hydraulic device of this invention.

Explanation of symbols

１１ＤＣモータ
１２油圧ポンプ
１３バッテリ
１４コンタクタ
１５コンタクタ制御部
１６演算装置 11 DC motor 12 Hydraulic pump 13 Battery 14 Contactor 15 Contactor control unit 16 Arithmetic unit

Claims

In a hydraulic apparatus including at least a hydraulic pump, a DC motor that drives the hydraulic pump, and a tank that stores hydraulic oil to be supplied to the hydraulic pump, the power supply to the DC motor is interposed between the DC motor and the battery. Means for measuring the potential on the input side and output side of the contactor to be supplied; means for calculating the current value flowing through the contactor based on the potential difference; the calculated current value and the allowable continuous contact capacity of the contactor and the DC motor A hydraulic apparatus having means for calculating an allowable continuous operation time of the contactor and the DC motor based on the continuous contact capacity, and a control means for cutting off the contactor contact when the continuous operation time exceeds the calculated time.