JPH0332968A - Brake ratio control device for front and rear wheels of automobile - Google Patents
Brake ratio control device for front and rear wheels of automobileInfo
- Publication number
- JPH0332968A JPH0332968A JP17072389A JP17072389A JPH0332968A JP H0332968 A JPH0332968 A JP H0332968A JP 17072389 A JP17072389 A JP 17072389A JP 17072389 A JP17072389 A JP 17072389A JP H0332968 A JPH0332968 A JP H0332968A
- Authority
- JP
- Japan
- Prior art keywords
- rear wheels
- brake
- automobile
- ratio control
- control device
- 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
Links
Landscapes
- Hydraulic Control Valves For Brake Systems (AREA)
Abstract
(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.
Description
【発明の詳細な説明】
（産業上の利用分野）
本発明は、自動車の前後輪のブレーキ比率制御装置に関
する。DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a brake ratio control device for front and rear wheels of an automobile.
（従来の技術）
従来における自動車のフットブレーキにおいては、ブレ
ーキペダルを踏むと、油圧が均等に４輪のブレーキにか
かるようになっていたが、最近においてはスリップの防
止等に対応して前後輪におけるブレーキ比率を走行情況
に応じて適宜制御するように°なっている。(Conventional technology) In conventional foot brakes for automobiles, when the brake pedal was depressed, hydraulic pressure was applied equally to the brakes on all four wheels. The brake ratio is controlled as appropriate depending on the driving situation.
前後輪におけるブレーキ比率を制御するための要素とし
ては、ブレーキの押圧度と自動車の旋回時にかかる横方
向加速度とがあげられる。すなわち、ブレーキの押圧度
が設定レベル以下の場合は前後輪におけるブレーキ比率
は一定であればよいが、設定レベルを越えると後輪の増
加率が制限されてブレーキ比率が前輪のほうが後輪より
高くなることが好ましく、かつ、その設定レベルは自動
車に旋回時においてかかる横方向加速度により設定され
るものである（特開昭６２−２５８８４３号公報の第３
図、第４図参照）。Elements for controlling the brake ratio between the front and rear wheels include the degree of brake pressure and the lateral acceleration applied when the vehicle turns. In other words, if the degree of brake pressure is below the set level, the brake ratio between the front and rear wheels should remain constant; however, if it exceeds the set level, the rate of increase for the rear wheels will be limited and the brake ratio will be higher for the front wheels than for the rear wheels. It is preferable that the setting level is set based on the lateral acceleration applied to the automobile when turning (see No. 3 of Japanese Unexamined Patent Publication No. 62-258843).
(See Figure 4).
そこで、上記の両要素に基づく前後輪におけるブレーキ
比率制御を行う構成が、特開昭６２−２５８８４３号公
報に示されている。Therefore, a configuration for performing brake ratio control on the front and rear wheels based on both of the above factors is disclosed in Japanese Patent Application Laid-Open No. 62-258843.
（発明が解決しようとする課題）
図（ａ）の横軸にはブレーキ押圧度が、第３図（ｂ）の
横軸には横方向加速度が示され、第４図（ａ）の横軸に
は前輪ブレーキ圧が、第４図（ｂ）の横軸には後輪ブレ
ーキ圧が示されている。(Problems to be Solved by the Invention) The horizontal axis in Figure (a) shows the degree of brake pressing, the horizontal axis in Figure 3(b) shows the lateral acceleration, and the horizontal axis in Figure 4(a) shows the degree of brake pressing. shows the front wheel brake pressure, and the horizontal axis of FIG. 4(b) shows the rear wheel brake pressure.
つぎに、前後輪ブレーキ比率制御装置の動作を第２図な
いし第４図を参照して説明する。Next, the operation of the front and rear wheel brake ratio control device will be explained with reference to FIGS. 2 to 4.
まず、各センサ３，１０それぞれから与えられる信号ｘ
ｌ＝α、ｘ２＝βに基づいて第３図（ａ）（ｂ）からそ
れぞれ各ファジィルールの対応するメンバーシップ関数
に適合するメンバーシップ値、ＺＲｆ （ａ’）＝Ｏ，
ＰＳｆ （ａ）＝Ｏ，ＰＭｆ （ａ）＝０．３．ＰＬｆ
（α）＝０．７．ＺＲｆ （β）−〇。First, the signal x given from each sensor 3, 10
Based on l=α and x2=β, the membership values that fit the corresponding membership functions of each fuzzy rule from FIGS. 3(a) and (b), respectively, are ZRf (a')=O,
PSf (a)=O, PMf (a)=0.3. PLf
(α)=0.7. ZRf (β) −〇.
ＰＳｆ （β’）＝０．８．ＰＭｆ （β） −０，２
，ＰＬｒ（β）＝０が求められる。PSf (β')=0.8. PMf (β) −0,2
, PLr(β)=0 is obtained.
そして、各ファジィルール毎に、各前件部ｘｌ。Then, for each fuzzy rule, each antecedent part xl.
ｘ２のメンバーシップ値の最も小さい値が前件部適合度
として選択される（ＭＩＮ演算）。例えば、ルールにお
いては、前件部の各メンバーシップ値が［０，０］故に
前件部適合度は「０」となる。The smallest membership value of x2 is selected as the antecedent fitness (MIN calculation). For example, in the rule, since each membership value of the antecedent part is [0, 0], the antecedent part fitness is "0".
このように各ルールにおいて得られる前件部適合度によ
って第４図（ａ）（ｂ）から各ファジィルールのｙｔ、
ｙ ２に関する各メンバーシップ関数が裁断され、さら
に裁断されたすべてのファジィルールのｙｔ、ｙ２に関
する各メンバーシップ関数が重ね合わされ（ＭＡＸ演算
）、その斜線で示す重ね合わせ図形それぞれのの重心Ｇ
位置に対応する位置の前後輪のブレーキ圧ｙｌ 、ｙ
２ に関するデータ信号Ｙが出力される。In this way, based on the antecedent fitness obtained for each rule, yt of each fuzzy rule,
Each membership function related to y2 is cut, and each membership function related to yt and y2 of all the cut fuzzy rules is superimposed (MAX operation), and the center of gravity G of each superimposed figure shown by diagonal lines is
Brake pressure yl, y of the front and rear wheels at the position corresponding to the position
A data signal Y regarding 2 is output.
このデータ信号Ｙは電圧信号として切り替え制御バルブ
４に与えられ、これにより切り替えパルプ４が適宜切り
替えられて前輪ホイールシリンダ６、後輪ホイールシリ
ンダ７への油送量が制御される。This data signal Y is given as a voltage signal to the switching control valve 4, whereby the switching pulp 4 is appropriately switched and the amount of oil fed to the front wheel cylinder 6 and the rear wheel cylinder 7 is controlled.
このように、ブレーキの押圧度合いと自動車の旋回に伴
う横方向加速度とに基づいて前後輪のブレーキ比率が制
御されることにより、通常の走行、旋回時ともに、前後
輪において適切にブレーキが働き、安全な走行が可能と
なる。In this way, the brake ratio of the front and rear wheels is controlled based on the degree of brake pressure and the lateral acceleration associated with turning the vehicle, so that the brakes work appropriately on the front and rear wheels both during normal driving and when turning. Safe driving becomes possible.
（発明の効果）
以上説明したことから明らかなように、本発明によれば
、横方向加速度とブレーキ押圧度とを用いてをファジィ
推論し、その推論結果に従って的確な前後輪のブレーキ
比率制御を行うので、これにより、簡単な構成において
、前後輪において常に適切にブレーキが働くようになり
、安全な走行ができるようになった。(Effects of the Invention) As is clear from the above explanation, according to the present invention, fuzzy inference is performed using lateral acceleration and brake pressure, and accurate brake ratio control of the front and rear wheels is performed according to the inference result. As a result, with a simple configuration, the brakes can always work properly on the front and rear wheels, making it possible to drive safely.
図は本発明の実施例に係り、第１図は本発明の実施例に
係る自動車の前後輪のブレーキ比率制御装置の構成を示
すブロック図、第２図は第１図のファジィコントローラ
に記憶されているファジィルールの対応参照表図、第３
図（ａ）（ｂ）のそれぞれは前件部変数におけるメンバ
ーシップ関数を示す図、第４図（ａ）（ｂ）のそれぞれ
は後件部変数におけるメンバーシップ関数を示す図であ
る。
３・・・油圧センサ（ブレーキ押圧度検出手段）、１０
・・・加速度センサ（横方向加速度検出手段）、１２・
・・ファジィコントローラ。
第
図
第
２
図
第
図（ａ）The figures relate to an embodiment of the present invention; FIG. 1 is a block diagram showing the configuration of a brake ratio control device for front and rear wheels of an automobile according to an embodiment of the present invention; and FIG. Correspondence reference table of fuzzy rules, Part 3
FIGS. 4(a) and 4(b) each show a membership function for the antecedent part variable, and FIGS. 4(a) and 4(b) each show a membership function for the consequent part variable. 3... Oil pressure sensor (brake pressure detection means), 10
... Acceleration sensor (lateral acceleration detection means), 12.
...Fuzzy controller. Figure 2 Figure 2 Figure (a)
Claims (1)
検出する検出手段と、 前記検出手段から入力される横方向加速度およびブレー
キ押圧度に関する前件部変数から、ファジィルールと、
ファジィラベル毎に割り当てられたメンバーシップ関数
とに従って前後輪のブレーキ比率をファジィコントロー
ルするファジィコントローラと、 を備えたことを特徴とする自動車の前後輪のブレーキ比
率制御装置。(1) A detection means for detecting each of the lateral acceleration and the brake pressure degree, and a fuzzy rule based on the antecedent variables regarding the lateral acceleration and the brake pressure degree inputted from the detection means,
A brake ratio control device for front and rear wheels of an automobile, comprising: a fuzzy controller that fuzzy controls the brake ratio of front and rear wheels according to a membership function assigned to each fuzzy label.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17072389A JPH0332968A (en) | 1989-06-30 | 1989-06-30 | Brake ratio control device for front and rear wheels of automobile |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17072389A JPH0332968A (en) | 1989-06-30 | 1989-06-30 | Brake ratio control device for front and rear wheels of automobile |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0332968A true JPH0332968A (en) | 1991-02-13 |
Family
ID=15910198
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP17072389A Pending JPH0332968A (en) | 1989-06-30 | 1989-06-30 | Brake ratio control device for front and rear wheels of automobile |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0332968A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1993011007A1 (en) * | 1991-11-29 | 1993-06-10 | Mitsubishi Jidosha Kogyo Kabushiki Kaisha | Method and apparatus for controlling rear wheel braking force |
-
1989
- 1989-06-30 JP JP17072389A patent/JPH0332968A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1993011007A1 (en) * | 1991-11-29 | 1993-06-10 | Mitsubishi Jidosha Kogyo Kabushiki Kaisha | Method and apparatus for controlling rear wheel braking force |
| US5480221A (en) * | 1991-11-29 | 1996-01-02 | Mitsubishi Jidosha Kogyo Kabushiki Kaisha | Rear wheel braking force control method and an apparatus therefor |
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