JPH0572532B2 - - Google Patents
Info
- Publication number
- JPH0572532B2 JPH0572532B2 JP59245270A JP24527084A JPH0572532B2 JP H0572532 B2 JPH0572532 B2 JP H0572532B2 JP 59245270 A JP59245270 A JP 59245270A JP 24527084 A JP24527084 A JP 24527084A JP H0572532 B2 JPH0572532 B2 JP H0572532B2
- Authority
- JP
- Japan
- Prior art keywords
- torque
- value
- hydraulic pressure
- brake
- comparator
- 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.)
- Expired - Fee Related
Links
- 238000001514 detection method Methods 0.000 claims description 15
- 238000010586 diagram Methods 0.000 description 5
- 230000007423 decrease Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 238000011056 performance test Methods 0.000 description 2
- 238000013459 approach Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000006870 function Effects 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L5/00—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes
- G01L5/28—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes for testing brakes
- G01L5/282—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes for testing brakes the vehicle wheels cooperating with rotatable rolls
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Force Measurement Appropriate To Specific Purposes (AREA)
Description
【発明の詳細な説明】
産業上の利用分野
本発明はブレーキテスタのトルク制御装置に関
する。DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a torque control device for a brake tester.
従来の技術
車両用ブレーキの性能試験の１つとして制動性
の評価をするための制動試験がある。この制動試
験装置は第３図に示す構成にされる。供試ブレー
キ１の回転ドラム（又はデイスク）１Ａはフライ
ホイール２と共に駆動用電動機３によつて設定回
転数で回転させておき、ブレーキシユー１Ｂを油
圧操作することでドラム１Ａに設定トルクに応じ
た制動をかけ、ドラム１Ａの停止までの時間等を
計測する。BACKGROUND ART As one of the performance tests for vehicle brakes, there is a braking test for evaluating braking performance. This braking test apparatus has the configuration shown in FIG. The rotating drum (or disk) 1A of the test brake 1 is rotated together with the flywheel 2 at a set rotation speed by the drive electric motor 3, and by hydraulically operating the brake shoe 1B, the drum 1A is rotated according to the set torque. Then apply braking and measure the time until the drum 1A stops.
制動トルク制御装置は、トルク設定器４のトル
ク設定値とロードセル５によるブレーキシユー１
Ｂのトルク検出値とを比較する自動トルク制御系
に構成される。即ち、トルク設定値とトルク検出
値との偏差がトルク制御アンプ６で演算されて油
圧指令にされ、この油圧指令とブレーキシユー１
Ｂの操作油圧検出器７の検出値との偏差が油圧制
御アンプ８で演算されてストローク指令にされ、
このストローク指令と油圧発生マスタシリンダ９
のストローク検出器１０の検出値との偏差がスト
ローク制御アンプ１１で演算されて操作シリンダ
１２の操作信号にされ、この操作信号に応じて操
作シリンダ１２がマスタシリンダ９に供給する油
圧を制御する。このように、自動トルク制御系は
マイナループに油圧制御系とストローク制御系を
持つてブレーキシユー１Ｂとドラム１Ａ間に設定
トルクに従つた制動トルクを加える。 The braking torque control device controls the torque setting value of the torque setting device 4 and the brake shoe 1 using the load cell 5.
It is configured as an automatic torque control system that compares the detected torque value of B. That is, the deviation between the torque setting value and the detected torque value is calculated by the torque control amplifier 6 and converted into a hydraulic pressure command, and this hydraulic pressure command and the brake shoe 1
The deviation from the detected value of the operating oil pressure detector 7 of B is calculated by the oil pressure control amplifier 8 and made into a stroke command,
This stroke command and the hydraulic pressure generation master cylinder 9
The deviation from the detected value of the stroke detector 10 is calculated by the stroke control amplifier 11 and used as an operation signal for the operation cylinder 12, and the hydraulic pressure supplied by the operation cylinder 12 to the master cylinder 9 is controlled in accordance with this operation signal. In this way, the automatic torque control system has a hydraulic control system and a stroke control system in the minor loop, and applies braking torque according to the set torque between the brake shoe 1B and the drum 1A.
従来の自動トルク制御装置において、制動が進
んでブレーキドラムの回転数零になつたときまた
は零近辺に近づいたとき、ロードセル５によるト
ルク検出値が零になる。これは実回転数零でなく
分解能不足から零になることもある。このとき、
制御ループはオープンループと同等になつてしま
い、トルク制御アンプ６の出力（油圧指令）は最
大リミツタ値になり、油圧制御アンプ８は油圧
100％の最大リミツタ値になつて油圧を100％まで
急激に上昇させる。この現象はマスタシリンダ９
や油圧配管さらには供試ブレーキ１に衝撃を与え
る。また、供試ブレーキ１に許容される油圧が小
さい場合に該ブレーキ１を破損する恐れがある。 In the conventional automatic torque control device, when the braking progresses and the rotational speed of the brake drum reaches zero or approaches zero, the torque value detected by the load cell 5 becomes zero. This may not be the actual rotation speed of zero, but may be zero due to insufficient resolution. At this time,
The control loop becomes equivalent to an open loop, the output (hydraulic pressure command) of the torque control amplifier 6 becomes the maximum limiter value, and the hydraulic control amplifier 8
When the maximum limiter value reaches 100%, the oil pressure increases rapidly to 100%. This phenomenon occurs when the master cylinder 9
A shock is applied to the hydraulic pipes, the test brake 1, and the test brake 1. Furthermore, if the hydraulic pressure allowed by the test brake 1 is small, there is a risk that the brake 1 will be damaged.
このような不都合を解消するために、従来から
ブレーキドラム１Ａの回転数を検出する検出器
と、この検出器の検出値が零になつたときに油圧
制御量を零に強制制御するコンパレータとを設け
るようにしている。 In order to eliminate this inconvenience, conventionally a detector for detecting the rotation speed of the brake drum 1A and a comparator for forcibly controlling the hydraulic control amount to zero when the detected value of this detector becomes zero. I am trying to set it up.
発明が解決しようとする問題点
しかし、従来では回転数検出器の検出精度や動
作遅れ時間から実回転数10rpm〜数rpmで油圧制
御量を零にするものであつた。このようなブレー
キオフ制御は第４図に示すように、制動開始でト
ルク（同図ｂ）及び油圧（同図ｃ）共に設定値に
あつて回転数（同図ａ）が一定の傾斜で降下して
くるときに、回転数が数回転になつたとき（時刻
t1）にコンパレータによる油圧零（トルク零）制
御を行なう。このため、油圧零時点以降からは自
由回転による自然停止になり、フライホイール２
の慣性が大きいときには長い時間回転しつづけて
次の試験を遅らせるなど効率の悪い試験になる
し、制動時間の測定誤差発生など精度良い測定を
難しくする。Problems to be Solved by the Invention However, in the past, the hydraulic control amount was set to zero at an actual rotation speed of 10 rpm to several rpm due to the detection accuracy of the rotation speed detector and the operation delay time. As shown in Figure 4, this kind of brake-off control is such that at the start of braking, both the torque (b in the figure) and oil pressure (c in the figure) are at the set values, and the rotational speed (a in the figure) decreases at a constant slope. When the number of revolutions reaches several revolutions (when the time
At t 1 ), hydraulic pressure (zero torque) control is performed using a comparator. Therefore, after the oil pressure is zero, the flywheel 2 comes to a natural stop due to free rotation.
When the inertia of the motor is large, it continues to rotate for a long time, delaying the next test, resulting in an inefficient test, and it also makes accurate measurement difficult, as errors occur in braking time measurements.
問題点を解決するための手段
本発明は、回転数検出器の検出値が零近辺にな
つたことを検出するコンパレータと、このコンパ
レータの検出時の油圧検出値を記憶するメモリ
と、コンパレータの検出後には該メモリの記憶値
によつて油圧制御させる油圧指令手段とを設ける
ものである。Means for Solving the Problems The present invention includes a comparator that detects when the detected value of the rotation speed detector becomes close to zero, a memory that stores the oil pressure detected value at the time of detection by the comparator, and a Later, a hydraulic pressure command means is provided for controlling the hydraulic pressure according to the values stored in the memory.
作 用
回転数検出器の検出によるコンパレータの出力
で検出直前の油圧制御量を継続することにより急
激な油圧上昇を抑えながら同じ制動力による停止
制御を行なう。Function: By continuing the oil pressure control amount immediately before detection using the comparator output detected by the rotation speed detector, stop control is performed using the same braking force while suppressing a sudden increase in oil pressure.
実施例
第１図は本発明の一実施例を示す要部回路図で
ある。トルク制御アンプ６はトルク設定器４の設
定値とロードセル５のトルク検出値とを突合せて
その偏差を比例積分演算して油圧指令出力を得、
油圧制御アンプ８は油圧指令と油圧検出器７の検
出値と突合せた演算をする。ここで、トルク制御
アンプ６はダイオードD1と抵抗R1，R2によるリ
ミツタ回路が含まれ、このリミツタ回路のリミツ
タ値がバツフアアンプ２１の出力電圧で設定され
る。バツフアアンプ２１の出力電圧は通常にはリ
ミツタ設定器２２の設定値L1で設定され、回転
数零検出時にはアナログ切換スイツチ２３で設定
値L2に切換設定される。設定値L2は以下の構成
によつて制御される。Embodiment FIG. 1 is a main circuit diagram showing an embodiment of the present invention. The torque control amplifier 6 compares the setting value of the torque setting device 4 with the torque detection value of the load cell 5, calculates the deviation by proportional integration, and obtains a hydraulic pressure command output.
The hydraulic control amplifier 8 performs calculations by comparing the hydraulic pressure command with the detected value of the hydraulic pressure detector 7. Here, the torque control amplifier 6 includes a limiter circuit including a diode D 1 and resistors R 1 and R 2 , and the limiter value of this limiter circuit is set by the output voltage of the buffer amplifier 21 . The output voltage of the buffer amplifier 21 is normally set at the set value L1 of the limiter setter 22, and is switched to the set value L2 by the analog changeover switch 23 when zero rotation speed is detected. The set value L2 is controlled by the following configuration.
ブレーキドラムの回転数を検出する回転数検出
器２４の検出値と回転数零設定値OSETとがコンパ
レータ２５で比較され、ドラム回転数が零設定値
OSETにまで降下したときにコンパレータ２５に反
転出力が取出される。コンパレータ２５の出力は
メモリ２６の記憶指令にされると共に切換スイツ
チ２３の設定値L2側への切換指令にされる。メ
モリ２６は油圧検出器７の検出信号をコンパレー
タ２５からの記憶指令で記憶保持し、この記憶信
号を設定値L2として出力しつづける。 A comparator 25 compares the detection value of the rotation speed detector 24 that detects the rotation speed of the brake drum with the rotation speed zero setting value OSET , and the drum rotation speed is determined to be the zero setting value.
When the voltage drops to O SET , an inverted output is taken out to the comparator 25. The output of the comparator 25 is used as a storage instruction for the memory 26 and also as a switching instruction for the changeover switch 23 to the set value L2 side. The memory 26 stores and holds the detection signal of the oil pressure detector 7 in response to a storage command from the comparator 25, and continues to output this storage signal as the set value L2 .
こうした構成の動作を第２図を参照して説明す
る。制動試験開始によつてトルク設定器４のトル
ク設定値に応じた制動トルク（第２図ｂ）になる
ようトルク制御アンプ６が油圧指令を出し、また
油圧制御アンプ８はトルクに応じた制動油圧（第
２図ｃ）になるようストローク指令を出す。この
制動によつてブレーキドラム１Ａは回転数（第２
図ａ）が一定の傾斜で降下してくる。そして、回
転数が設定値OSETまで降下したとき（時刻t1）、
コンパレータ２５に検出出力が取出され、メモリ
２６にはそのときの油圧が記憶され、この油圧信
号が設定値L2としてトルク制御アンプ６のリミ
ツタ値になる。従つて、設定値OSETまでの回転数
低下後も油圧指令即ちトルク制御アンプ６の出力
はリミツタ値L2に制限されたトルク制御が継続
され、ロードセル５の検出分解能不足にもリミツ
タ値L2に制限されたトルク制御によつて従来の
ような油圧の急激な上昇が抑えられて制限された
油圧による速やかな停止制御がなされる。また、
回転数零になつた完全な停止後油圧制限される。 The operation of such a configuration will be explained with reference to FIG. At the start of the braking test, the torque control amplifier 6 issues a hydraulic pressure command so that the braking torque (Fig. 2b) corresponds to the torque setting value of the torque setting device 4, and the hydraulic control amplifier 8 outputs a hydraulic pressure command according to the torque. (Figure 2c) Issue a stroke command. This braking causes the brake drum 1A to rotate at a rotational speed (second
Figure a) is descending at a constant slope. Then, when the rotation speed drops to the set value O SET (time t 1 ),
The detection output is taken out by the comparator 25, the oil pressure at that time is stored in the memory 26, and this oil pressure signal becomes the limiter value of the torque control amplifier 6 as the set value L2 . Therefore, even after the rotation speed has decreased to the set value O SET , the hydraulic pressure command, that is, the output of the torque control amplifier 6 continues to be controlled by the limiter value L 2 , and even if the detection resolution of the load cell 5 is insufficient, the limiter value L 2 remains unchanged. Torque control that is limited to this prevents a sudden increase in oil pressure as in the prior art, and provides quick stop control using limited oil pressure. Also,
After a complete stop when the rotation speed reaches zero, the oil pressure is limited.
なお、実施例においては、設定値OSETまでの回
転数低下でトルク制御アンプ６のリミツタ値を切
換える場合を示すが、これはメモリ２６の出力を
トルク制御アンプ６の出力に替えて直接に油圧制
御アンプ８の油圧指令として与える回路構成にし
て同等の作用効果を得ることができる。 In the embodiment, a case is shown in which the limiter value of the torque control amplifier 6 is switched when the rotation speed decreases to the set value O SET , but in this case, the output of the memory 26 is changed to the output of the torque control amplifier 6 and the hydraulic pressure is directly changed. The same effect can be obtained by using a circuit configuration that gives the control amplifier 8 as a hydraulic pressure command.
発明の効果
本発明によれば、回転数の零近辺検出でそのと
きの油圧を油圧制御系の指令値又は制限値とする
ため、トルク制御系がオープンループになるも油
圧の急激な上昇を抑制しながら同等の降下率で回
転停止まで速やかな停止及び精度良い制動性能試
験を可能にする。Effects of the Invention According to the present invention, since the oil pressure at that time is used as the command value or limit value of the oil pressure control system when the rotation speed is detected near zero, a sudden increase in oil pressure is suppressed even though the torque control system becomes an open loop. However, it enables quick stopping to rotational stop and accurate braking performance tests at the same descent rate.
第１図は本発明の一実施例を示す要部回路図、
第２図は第１図の動作説明のための動作波形図、
第３図はブレーキテスタのトルク制御装置構成
図、第４図は従来の動作説明のための動作波形図
である。
１……供試ブレーキ、２……フライホイール、
３……電動機、４……トルク設定器、５……ロー
ドセル、６……トルク制御アンプ、７……油圧検
出器、８……油圧制御アンプ、２１……バツフア
アンプ、２２……リミツタ設定器、２３……切換
スイツチ、２４……回転数検出器、２５……コン
パレータ、２６……メモリ。
FIG. 1 is a main circuit diagram showing an embodiment of the present invention;
Fig. 2 is an operation waveform diagram for explaining the operation of Fig. 1;
FIG. 3 is a configuration diagram of a torque control device for a brake tester, and FIG. 4 is an operation waveform diagram for explaining conventional operation. 1... Test brake, 2... Flywheel,
3... Electric motor, 4... Torque setting device, 5... Load cell, 6... Torque control amplifier, 7... Oil pressure detector, 8... Oil pressure control amplifier, 21... Buffer amplifier, 22... Limiter setting device, 23... Selector switch, 24... Rotation speed detector, 25... Comparator, 26... Memory.
Claims (1)
てトルク制御アンプから油圧指令を得、この油圧
指令と油圧検出値との突合せによつて供試ブレー
キの操作油圧を制御するブレーキテスタのトルク
制御装置において、供試ブレーキの回転数検出器
の検出値が零近辺になつたことを検出するコンパ
レータと、このコンパレータの検出時の前記油圧
検出値を記憶するメモリと、前記コンパレータの
検出後に前記メモリの記憶値によつて油圧制御さ
せる油圧指令手段とを備えたことを特徴とするブ
レーキテスタのトルク制御装置。1. A torque control device for a brake tester that obtains a hydraulic pressure command from a torque control amplifier by comparing a torque setting value and a torque detection value, and controls the operating hydraulic pressure of a test brake by comparing this hydraulic pressure command and a hydraulic pressure detection value. , a comparator for detecting that the detection value of the rotation speed detector of the test brake has become near zero, a memory for storing the oil pressure detection value at the time of detection by the comparator, and a memory for storing the oil pressure detection value after detection by the comparator. 1. A torque control device for a brake tester, comprising: hydraulic pressure command means for controlling hydraulic pressure according to a stored value.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP59245270A JPS61122541A (en) | 1984-11-20 | 1984-11-20 | Torque controller for brake tester |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP59245270A JPS61122541A (en) | 1984-11-20 | 1984-11-20 | Torque controller for brake tester |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS61122541A JPS61122541A (en) | 1986-06-10 |
| JPH0572532B2 true JPH0572532B2 (en) | 1993-10-12 |
Family
ID=17131180
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP59245270A Granted JPS61122541A (en) | 1984-11-20 | 1984-11-20 | Torque controller for brake tester |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS61122541A (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6450332U (en) * | 1987-09-25 | 1989-03-28 | ||
| JPH0760347B2 (en) * | 1988-03-05 | 1995-06-28 | 有限会社第一計測 | Viscoelastic variable load transmission device |
| JP2545250Y2 (en) * | 1990-12-17 | 1997-08-25 | 株式会社明電舎 | Air brake test equipment |
-
1984
- 1984-11-20 JP JP59245270A patent/JPS61122541A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS61122541A (en) | 1986-06-10 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |