JPH0367900B2 - - Google Patents
Info
- Publication number
- JPH0367900B2 JPH0367900B2 JP14589283A JP14589283A JPH0367900B2 JP H0367900 B2 JPH0367900 B2 JP H0367900B2 JP 14589283 A JP14589283 A JP 14589283A JP 14589283 A JP14589283 A JP 14589283A JP H0367900 B2 JPH0367900 B2 JP H0367900B2
- Authority
- JP
- Japan
- Prior art keywords
- circuit
- brake
- brake pressure
- release signal
- pressure release
- 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
Links
- 230000002040 relaxant effect Effects 0.000 claims description 2
- 230000010349 pulsation Effects 0.000 description 4
- 239000000725 suspension Substances 0.000 description 4
- 238000010586 diagram Methods 0.000 description 2
- 230000001133 acceleration Effects 0.000 description 1
- 230000001771 impaired effect Effects 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
- B60T8/00—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force
- B60T8/17—Using electrical or electronic regulation means to control braking
- B60T8/173—Eliminating or reducing the effect of unwanted signals, e.g. due to vibrations or electrical noise
Landscapes
- Engineering & Computer Science (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Regulating Braking Force (AREA)
Description
【発明の詳細な説明】
本発明は、車輪ブレーキと、該車輪ブレーキへ
の油圧の供給を停止する油圧制御回路と、車輪速
度検出器と、該車輪速度検出器の検出値に応じて
前記油圧制御回路にブレーキ圧を緩めるためのブ
レーキ圧緩め信号およびブレーキ圧の増加を停止
するための増圧停止信号を与える判断回路とを備
えるアンチロツク制動装置に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention provides a wheel brake, a hydraulic control circuit for stopping the supply of hydraulic pressure to the wheel brake, a wheel speed detector, and a hydraulic control circuit for stopping the supply of hydraulic pressure to the wheel brake. The present invention relates to an anti-lock braking device including a determination circuit that provides a control circuit with a brake pressure release signal for relaxing the brake pressure and a pressure increase stop signal for stopping the increase in brake pressure.
従来、かかるアンチロツク制動装置では、悪路
を走行中にブレーキ操作をすると、制動油圧が一
定であつても車輪の接地性の変化により車輪に加
わる制動力が変化するので、車両のサスペンシヨ
ンが前後方向に振動し、それに応じて車輪速度に
脈動が生じることがある。このような脈動が発生
すると、車輪がロツクする可能性のない場合にお
いても、判断回路で車輪ロツクの可能性があると
誤判断し、油圧制御回路にブレーキ圧緩め信号あ
るいは増圧停止信号が与えられ、制動力が低下し
て制動距離が大きくなることがある。 Conventionally, with such anti-lock braking devices, when the brakes are operated while driving on a rough road, even if the brake oil pressure is constant, the braking force applied to the wheels changes due to changes in the ground contact of the wheels, so the suspension of the vehicle changes from front to back. direction, and a corresponding pulsation in wheel speed may occur. When such pulsation occurs, the judgment circuit incorrectly determines that there is a possibility of wheel locking even when there is no possibility of wheel locking, and a brake pressure release signal or pressure increase stop signal is given to the hydraulic control circuit. This may reduce the braking force and increase the braking distance.
本発明者がこの点について詳細な実験を行なつ
た結果、上述のような場合には、サスペンシヨン
の前後方向の固有振動数（一般的には15〜25Hz）
に等しい頻度で判断回路からブレーキ圧緩め信号
が出力されていることが判明した。一方、実際に
ドライバーの過大なブレーキ入力により車輪ロツ
クの可能性を生じてアンチロツク動作が行なわれ
るときのブレーキ圧緩め信号の周波数は約８Hzを
超えることがなく、しかもその間隔は一定値（通
常0.1秒）以上となることがわかつている。 As a result of detailed experiments conducted by the inventor on this point, it was found that in the case described above, the natural frequency of the suspension in the longitudinal direction (generally 15 to 25 Hz)
It was found that the brake pressure release signal was output from the judgment circuit at a frequency equal to . On the other hand, when an anti-lock operation is performed due to the possibility of wheels locking due to the driver's excessive brake input, the frequency of the brake pressure release signal does not exceed approximately 8 Hz, and the interval is a constant value (usually 0.1 seconds) or more.
本発明は、このような事情に鑑みてなされたも
のであり、判断回路からのブレーキ圧緩め信号の
周波数が設定値以上あるいはパルス間隔が一定値
以下のときに、そのブレー圧緩め信号を油圧制御
回路に与えないようにして、悪路における制動距
離の増加を防止することができるアンチロツク制
動装置を提供することを目的とする。 The present invention was made in view of the above circumstances, and when the frequency of the brake pressure release signal from the judgment circuit is above a set value or the pulse interval is below a certain value, the brake pressure release signal is hydraulically controlled. It is an object of the present invention to provide an anti-lock braking device that can prevent an increase in braking distance on rough roads by not affecting the circuit.
以下、図面により本発明の一実施例について説
明すると、先ず第１図において、車輪速度検出器
１の検出値は、周波数−電圧変換器２で車輪速度
に比例した電圧信号Vwに変換され、この電圧信
号Vwは、判断回路３に入力されるとともに、演
算回路４に与えられる。演算回路４では電圧信号
Vwに基づいて、車両速度Ｕおよび車輪加速度
U〓wを演算し、判断回路３に入力する。判断回路
３では、電圧信号Vw、車両速度Ｕおよび車輪速
度U〓w等によつて車輪がロツクする可能性がある
かどうかを判断し、一方の出力端３ａからブレー
キ圧緩め信号を出力し、他方の出力端３ｂから増
圧停止信号を出力する。一方、車輪ブレーキ５へ
の圧油の供給を制御するために、油圧制御回路６
が設けられており、この油圧制御回路６には判断
回路３からの信号によつて開閉する一対の電磁弁
７，８が含まれる。一方の電磁弁７は、それのみ
が通電状態にあるときブレーキ圧の増加を阻止す
るものであり、両電磁弁７，８がともに通電状態
にあるときにはブレーキ圧が低下され、両電磁弁
７，８がともに非通電状態にあるときにはドライ
バーのブレーキ操作に応じてブレーキ圧を上昇す
ることが許容される。 Hereinafter, one embodiment of the present invention will be described with reference to the drawings. First, in FIG. The voltage signal Vw is input to the judgment circuit 3 and is also given to the arithmetic circuit 4. In the calculation circuit 4, the voltage signal
Based on Vw, vehicle speed U and wheel acceleration
U〓w is calculated and inputted to the judgment circuit 3. The judgment circuit 3 judges whether there is a possibility that the wheels will lock based on the voltage signal Vw, the vehicle speed U, the wheel speed U〓w, etc., and outputs a brake pressure release signal from one output terminal 3a. A pressure increase stop signal is output from the other output terminal 3b. On the other hand, in order to control the supply of pressure oil to the wheel brakes 5, a hydraulic control circuit 6
The hydraulic control circuit 6 includes a pair of solenoid valves 7 and 8 that are opened and closed in response to a signal from the determination circuit 3. One solenoid valve 7 prevents an increase in brake pressure when only it is energized, and when both solenoid valves 7 and 8 are both energized, the brake pressure is reduced and both solenoid valves 7, 8 are in a de-energized state, it is permitted to increase the brake pressure in response to the driver's brake operation.
判断回路３の一方の出力端３ａは、ANDゲー
ト９の一方の入力端に接続されるとともに、単安
定回路１０の入力端に接続される。この単安定回
路１０は、第２図ａで示すように出力端３ａから
出力されるブレーキ圧緩め信号の立ち下りから予
め定めた一定時間Ｔたとえば0.1秒間だけ持続し
て、第２図ｂで示すように負のパルスを出力する
機能を有し、その出力信号はANDゲート９の他
方の入力端に与えられる。このようにして、単安
定回路１０およびANDゲート９は、フイルタ回
路１１を構成し、パルス間隔が時間Ｔ以上のブレ
ーキ圧緩め信号のみを出力する。 One output terminal 3 a of the judgment circuit 3 is connected to one input terminal of an AND gate 9 and also to an input terminal of a monostable circuit 10 . This monostable circuit 10 continues for a predetermined period of time T, for example, 0.1 seconds from the fall of the brake pressure release signal outputted from the output terminal 3a, as shown in FIG. It has a function of outputting a negative pulse as shown in FIG. 9, and its output signal is applied to the other input terminal of AND gate 9. In this way, the monostable circuit 10 and the AND gate 9 constitute a filter circuit 11, which outputs only the brake pressure release signal whose pulse interval is equal to or longer than time T.
フイルタ回路１１の出力端は一方の電磁弁７の
駆動回路７ａに接続されるとともに、ORゲート
１２の一方の入力端に接続される。また判断回路
３の他方の出力端３ｂはORゲート１２の他方の
入力端に接続され、ORゲート１２の出力端は他
方の電磁弁８の駆動回路８ａに接続される。 The output end of the filter circuit 11 is connected to the drive circuit 7a of one of the solenoid valves 7, and is also connected to one input end of the OR gate 12. Further, the other output terminal 3b of the judgment circuit 3 is connected to the other input terminal of the OR gate 12, and the output terminal of the OR gate 12 is connected to the drive circuit 8a of the other electromagnetic valve 8.
次にこの実施例の作用について説明すると、悪
路などを走行中にブレーキ操作をしたときに、サ
スペンシヨンの前後方向の振動により車輪速度に
脈動が生じた場合、判断回路３からブレーキ圧緩
め信号が出力される可能性がある。しかしこのブ
レーキ圧緩め信号のパルス間隔は、通常0.1秒以
下であることがわかつており、フイルタ回路１１
によりカツトされる。したがつて、車輪がロツク
する可能性のないときに判断回路３からブレーキ
圧緩め信号が出力されたとしても、その信号が油
圧制御回路６に与えられることが阻止され、制動
距離の増加が防止される。しかも、車輪がロツク
される可能性のあるときには、ブレーキ圧緩め信
号がフイルタ回路１１を通過するので、アンチロ
ツク機能が損なわれることはない。 Next, the operation of this embodiment will be explained. When the brake is operated while driving on a rough road, if pulsation occurs in the wheel speed due to longitudinal vibration of the suspension, a brake pressure release signal is sent from the judgment circuit 3. may be output. However, it is known that the pulse interval of this brake pressure release signal is normally 0.1 seconds or less, and the filter circuit 11
It is cut by Therefore, even if a brake pressure release signal is output from the judgment circuit 3 when there is no possibility that the wheels will lock, that signal is prevented from being applied to the hydraulic control circuit 6, and an increase in braking distance is prevented. be done. Moreover, since the brake pressure release signal passes through the filter circuit 11 when there is a possibility that the wheels may be locked, the anti-lock function is not impaired.
上述の実施例では、ブレーキ圧緩め信号のパル
ス間隔が一定時間Ｔ以下のときにはブレーキ圧緩
め信号をカツトするフイルタ回路１１を用いた
が、ブレーキ圧緩め信号の周波数が一定値たとえ
ば８Hz以上であるときにブレーキ圧緩め信号をカ
ツトするフイルタ回路を用いてもよい。 In the above-mentioned embodiment, the filter circuit 11 is used which cuts off the brake pressure release signal when the pulse interval of the brake pressure release signal is less than a certain time T, but when the frequency of the brake pressure release signal is a certain value, for example, 8 Hz or more, the filter circuit 11 is used. A filter circuit may be used to cut off the brake pressure release signal.
以上のように本発明によれば、判断回路のブレ
ーキ圧緩め信号の出力端には、該ブレーキ圧緩め
信号のパルス間隔が予め定めた一定値以上、ある
いは周波数が予め定めた一定値以下であるときの
み通過することを許容するフイルタ回路が接続さ
れるので、悪路走行中のサスペンシヨンの振動に
よる車輪速度の脈動に起因して、ブレーキ圧緩め
信号が判断回路から出力されたとしても、該信号
が油圧制御回路に伝達されることはなく、したが
つて制動距離の増加が防止される。 As described above, according to the present invention, the output terminal of the brake pressure release signal of the determination circuit indicates that the pulse interval of the brake pressure release signal is greater than or equal to a predetermined constant value, or the frequency is less than or equal to a predetermined constant value. Since a filter circuit is connected that allows the signal to pass only when the brake pressure is released, even if a brake pressure release signal is output from the judgment circuit due to wheel speed pulsations due to suspension vibration while driving on a rough road, the brake pressure release signal is output from the judgment circuit. No signal is transmitted to the hydraulic control circuit, thus preventing an increase in braking distance.
図面は本発明の一実施例を示すものであり、第
１図はブロツク回路図、第２図は第１図の単安定
回路の特性図である。
１……車輪速度検出器、３……判断回路、３
ａ，３ｂ……出力端、５……車輪ブレーキ、６…
…油圧制御回路、１１……フイルタ回路。
The drawings show an embodiment of the present invention; FIG. 1 is a block circuit diagram, and FIG. 2 is a characteristic diagram of the monostable circuit shown in FIG. 1. 1... Wheel speed detector, 3... Judgment circuit, 3
a, 3b...Output end, 5...Wheel brake, 6...
...Hydraulic control circuit, 11...Filter circuit.
Claims (1)
供給を制御する油圧制御回路と、車輪速度検出器
と、該車輪速度検出器の検出値に応じて前記油圧
制御回路にブレーキ圧を緩めるためのブレーキ圧
緩め信号およびブレーキ圧の増加を停止するため
の増圧停止信号を与える判断回路とを備えるアン
チロツク制動装置において、前記判断回路のブレ
ーキ圧緩め信号の出力端には、該ブレーキ圧緩め
信号のパルス間隔が予め定めた一定値以上、ある
いは周波数が予め定めた一定値以下であるときの
み通過することを許容するフイルタ回路が接続さ
れることを特徴とするアンチロツク制動装置。1. A wheel brake, a hydraulic control circuit for controlling the supply of hydraulic pressure to the wheel brake, a wheel speed detector, and a brake for relaxing the brake pressure in the hydraulic control circuit according to the detected value of the wheel speed detector. In an anti-lock braking device comprising a pressure release signal and a judgment circuit that provides a pressure increase stop signal for stopping an increase in brake pressure, an output terminal of the brake pressure release signal of the judgment circuit is provided with a pulse of the brake pressure release signal. An anti-lock braking device characterized in that a filter circuit is connected to the filter circuit that allows passage only when the interval is above a predetermined value or when the frequency is below a predetermined value.
Priority Applications (5)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14589283A JPS6038247A (en) | 1983-08-10 | 1983-08-10 | anti-lock braking system |
| SE8403853A SE457161B (en) | 1983-08-10 | 1984-07-25 | UNLOCKED BRAKE SYSTEM |
| DE19843428941 DE3428941A1 (en) | 1983-08-10 | 1984-08-06 | Antilock brake system |
| CH381584A CH665175A5 (en) | 1983-08-10 | 1984-08-08 | ANTI-BLOCKED BRAKE DEVICE. |
| AT258984A AT392943B (en) | 1983-08-10 | 1984-08-09 | ANTI-BLOCKING BRAKE SYSTEM |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14589283A JPS6038247A (en) | 1983-08-10 | 1983-08-10 | anti-lock braking system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6038247A JPS6038247A (en) | 1985-02-27 |
| JPH0367900B2 true JPH0367900B2 (en) | 1991-10-24 |
Family
ID=15395461
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP14589283A Granted JPS6038247A (en) | 1983-08-10 | 1983-08-10 | anti-lock braking system |
Country Status (5)
| Country | Link |
|---|---|
| JP (1) | JPS6038247A (en) |
| AT (1) | AT392943B (en) |
| CH (1) | CH665175A5 (en) |
| DE (1) | DE3428941A1 (en) |
| SE (1) | SE457161B (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0277352A (en) * | 1988-09-13 | 1990-03-16 | Fujitsu Ten Ltd | Antiskid control device with acceleration sensor |
| DE4003327A1 (en) * | 1990-02-05 | 1991-08-08 | Bosch Gmbh Robert | ANTI-BLOCKING CONTROL SYSTEM |
| JPH0554133U (en) * | 1991-12-24 | 1993-07-20 | 光洋精工株式会社 | Brake device with anti-skid device |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1655454A1 (en) * | 1967-10-28 | 1971-08-12 | Teldix Gmbh | Anti-lock control system suitable for pressurized vehicle brakes |
| DE2064067A1 (en) * | 1970-12-28 | 1972-07-13 | Bosch Gmbh Robert | Control circuit for an anti-lock device |
| DE2726738C2 (en) * | 1977-06-14 | 1988-03-24 | Wabco Westinghouse Fahrzeugbremsen GmbH, 3000 Hannover | Circuit arrangement for regulating the brake pressure in anti-lock vehicle brake systems |
| JPS56116542A (en) * | 1980-01-24 | 1981-09-12 | Nippon Air Brake Co Ltd | Safety circuit of antiskid apparatus for vehicles |
| DE3224795A1 (en) * | 1982-07-02 | 1984-01-05 | Lentia GmbH Chem. u. pharm. Erzeugnisse - Industriebedarf, 8000 München | METHOD FOR PRODUCING GLYOXYL ACID AND GLYOXYL ACID DERIVATIVES |
-
1983
- 1983-08-10 JP JP14589283A patent/JPS6038247A/en active Granted
-
1984
- 1984-07-25 SE SE8403853A patent/SE457161B/en not_active IP Right Cessation
- 1984-08-06 DE DE19843428941 patent/DE3428941A1/en active Granted
- 1984-08-08 CH CH381584A patent/CH665175A5/en not_active IP Right Cessation
- 1984-08-09 AT AT258984A patent/AT392943B/en not_active IP Right Cessation
Also Published As
| Publication number | Publication date |
|---|---|
| CH665175A5 (en) | 1988-04-29 |
| SE8403853L (en) | 1985-02-11 |
| JPS6038247A (en) | 1985-02-27 |
| DE3428941C2 (en) | 1992-05-07 |
| SE457161B (en) | 1988-12-05 |
| ATA258984A (en) | 1990-12-15 |
| SE8403853D0 (en) | 1984-07-25 |
| DE3428941A1 (en) | 1985-02-28 |
| AT392943B (en) | 1991-07-10 |
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