JPS5929553A - Brake booster for automobile - Google Patents

Brake booster for automobile

Info

Publication number
JPS5929553A
JPS5929553A JP57139629A JP13962982A JPS5929553A JP S5929553 A JPS5929553 A JP S5929553A JP 57139629 A JP57139629 A JP 57139629A JP 13962982 A JP13962982 A JP 13962982A JP S5929553 A JPS5929553 A JP S5929553A
Authority
JP
Japan
Prior art keywords
brake
magnet
brake pedal
stroke
piston
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
JP57139629A
Other languages
Japanese (ja)
Inventor
Akira Shimokune
下久「ね」 朗
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.)
Mazda Motor Corp
Original Assignee
Mazda Motor Corp
Toyo Kogyo Co Ltd
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 Mazda Motor Corp, Toyo Kogyo Co Ltd filed Critical Mazda Motor Corp
Priority to JP57139629A priority Critical patent/JPS5929553A/en
Publication of JPS5929553A publication Critical patent/JPS5929553A/en
Pending legal-status Critical Current

Links

Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B60VEHICLES IN GENERAL
    • B60TVEHICLE 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
    • B60T13/00Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems
    • B60T13/74Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems with electrical assistance or drive
    • B60T13/745Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems with electrical assistance or drive acting on a hydraulic system, e.g. a master cylinder

Landscapes

  • Engineering & Computer Science (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Braking Systems And Boosters (AREA)
  • Braking Elements And Transmission Devices (AREA)

Abstract

PURPOSE:To obtain desired braking forces by optimum operation by a method in which a magnetic material moving reciprocally according to the stepping of a brake pedal and a magnet to attract the magnetic material are provided and the current to be supplied to the magnet is controlled so as to make it a set boosting characteristic. CONSTITUTION:When a brake pedal 1 is stepped in, the piston 8 of an oil- pressure cylinder 2 is pushed in the direction of (a) through a rod 7, a power piston 5, and a push rod 9. At the same time, the brake switch 12 turns ON to operate a control circuit 14. By the control circuit 14, electric current is supplied to the magnet 10 of the brake booster 3 and the magnetic material 11 on the periphery of the power piston 5 is attracted by the magnet 10. The piston 8 is thus boosted by the electromagnetic force and pushed. The stroke of the rod 7 is detected by a stroke detector 13 and its signal is put in the controller 14 where electric current supplied to the magnet 10 is controlled in such a way as to give the stroke a certain characteristic.

Description

【発明の詳細な説明】 本発明は、自動車の制動倍力装置、特に電磁力を利用し
て制動力の増強を図るようにした装置に関する。
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a brake booster for an automobile, and more particularly to a device that uses electromagnetic force to increase braking force.

ところで、自動車の制動装置においては、特に大きな制
動力を必要とする場合に、ブレーキペダルの踏込力を増
強する制動倍力装置か備えられるが、従来においては、
該装置としてエンジンの吸入負圧を利用したものが一般
に用いられている。
By the way, when a particularly large braking force is required, an automobile brake system is equipped with a brake booster that increases the force with which the brake pedal is depressed.
A device that utilizes the engine's intake negative pressure is generally used.

これは、制aJ油圧供給用の油圧シリンダと該シリンダ
を作動させるブレーキペダルとの間に介設され、ブレー
キペダルの踏込み時にエンジン吸入負圧と大気圧との圧
力差に基一つく力を発生させて、該力とブレーキペダル
の踏込力とによって上記油圧シリンダのピストンを作動
させるように構成したものである。
This is installed between the hydraulic cylinder for supplying the brake aJ hydraulic pressure and the brake pedal that operates the cylinder, and generates a force based on the pressure difference between the engine intake negative pressure and atmospheric pressure when the brake pedal is depressed. The piston of the hydraulic cylinder is actuated by this force and the depression force of the brake pedal.

然るに、上記のような制動rへ力装置にあっては、エン
ジン吸入負圧の調整が困難なだめ倍力特性を任意に設定
することができず、そのため、例えばブレーキペダルの
踏込み量に応じて制動力を増大させる等、最適の操作性
を得るだめのきめ細かな制御を行うことができない。し
かも、走行中におけるエンジンが停止した状態での制!
l1lJ操作時には倍力作用が得られず、また、吸入負
圧の(7−在しない過給機付エンジンを塔載した自動車
や電気自動車等には適用できない欠点がある。
However, with the above-mentioned braking force device, it is difficult to adjust the engine suction negative pressure and it is not possible to arbitrarily set the boosting characteristics. It is not possible to perform fine control such as increasing power to obtain optimal operability. Moreover, it can be controlled while the engine is stopped while driving!
There is a drawback that no boosting effect can be obtained during l1lJ operation, and that it cannot be applied to automobiles or electric cars equipped with supercharged engines that do not have negative suction pressure.

本発明は、従来の制動倍力装置における上記のような欠
点を解消するもので、倍力作用を生じさせるエネルギー
源として、エンジンの吸入負圧に代えて電磁力を利用す
る。これにより、倍力特性をブレーキペダルの踏込み昂
に応じて自由に設定=J’能として、所要の制動力を最
適の操作性でt(Iられるようにし、まだ、エンジン停
止時にも作動し、且つ吸入負圧を利用できない自動車に
ついても適用可能な制動倍力装置を実現する。
The present invention solves the above-mentioned drawbacks of conventional brake boosters, and uses electromagnetic force instead of the engine's suction negative pressure as an energy source for producing a boost effect. As a result, the boosting characteristics can be freely set according to the amount of depression of the brake pedal, allowing the necessary braking force to be applied with optimal operability, and it can still operate even when the engine is stopped. In addition, a brake booster is realized that can be applied to automobiles that cannot utilize suction negative pressure.

即ち、本発明においては、ホイール側の制動装置面に制
i1D〕油圧を供給する油圧シリンダと該シリンダを作
動させるブレーキペダルとの間に介設される制動倍力装
置において、上記ブレーキペダルの踏込みに応じて往復
動する磁性部材と、該磁性部材に対して制動方向の電磁
力を及ぼすように該磁性部材の近傍に配置されたマグネ
ットとを設けると共に、ブレーキペダルの踏込みを検出
するプレーキスインチ及び上記磁性部材の移動n1.を
検出するストローク検出器からの信りに基いて、予め設
定された倍力特性を得るように上記マグネットに対する
供給電流を調整する制御回路を備えたことを特徴とする
。これにより、」二記ロ的の達成が可能となる。
That is, in the present invention, in a brake booster that is interposed between a hydraulic cylinder that supplies hydraulic pressure to the brake device surface on the wheel side and a brake pedal that operates the cylinder, when the brake pedal is depressed, A brake inch that includes a magnetic member that reciprocates in response to a brake pedal, and a magnet that is placed near the magnetic member so as to exert an electromagnetic force in a braking direction on the magnetic member, and that detects depression of a brake pedal. and movement n1 of the magnetic member. The present invention is characterized by comprising a control circuit that adjusts the current supplied to the magnet so as to obtain a preset boosting characteristic based on the confidence from a stroke detector that detects the stroke. This makes it possible to accomplish the following.

尚、電磁力によってブレーキを作動させるようにした装
置としては、特開昭4’J−16128号公報に記載さ
れたものが存在する。この装置は、自動車のパンパに衝
突スイッチを収蔵して、該スイッチの作動時に通電され
る電磁石によってブレーキペダルと油圧シリンダとの間
の連接棒を強制的に制動方向に移動させるように構成し
たものであって、衝突時における非常ブレーキとして作
用する。従って、通常の運転中における制動操作時に作
用する制動倍力装置に関した本発明とは全く異質のもの
である。
Incidentally, as a device for operating a brake by electromagnetic force, there is a device described in Japanese Patent Laid-Open No. 4'J-16128. This device has a collision switch housed in the bumper of a car, and is configured to forcibly move a connecting rod between a brake pedal and a hydraulic cylinder in the braking direction by an electromagnet that is energized when the switch is activated. It acts as an emergency brake in the event of a collision. Therefore, this invention is completely different from the present invention, which relates to a brake booster that operates during a braking operation during normal driving.

以下、本発明を図面に示す実施例に基いて説明する。Hereinafter, the present invention will be explained based on embodiments shown in the drawings.

第1図に示すように、グレーキペタル1と油圧シリンダ
2との間に介設された制11iIノ倍力装置3は、ケー
シング4にパワーピストン5を内装し、口つ訃ピストン
5をリターンスプリング6によって」1記ペダル1°側
に付勢した構成である。そして上記パワーピストン5は
°、ペダル1の踏込みに応じて往復動するように該ペダ
ル1にオペし−テイングロツド7を介して連結され、且
つ該・ぐワーピストン5の油圧シリンダ2側への移ΦJ
J II;jに、1;亥シリンダ2におけるピストン8
がブツシュロッド9を介して制動油圧供給方向(a方向
)に押動されるように構成されている。
As shown in FIG. 1, the booster 3, which is interposed between the brake pedal 1 and the hydraulic cylinder 2, has a power piston 5 housed in a casing 4, and the power piston 5 is connected to a return spring 6. This is a configuration in which the pedal 1 is biased toward the 1° side. The power piston 5 is connected to the pedal 1 via an operating rod 7 so as to reciprocate in response to the depression of the pedal 1, and is connected to the power piston 5 to move toward the hydraulic cylinder 2 side. ΦJ
J II; j, 1; piston 8 in cylinder 2
is configured to be pushed in the braking oil pressure supply direction (direction a) via the bushing rod 9.

然して、上記ケーシング4内における油圧シリンダ2側
には、パワーピストン5の外周部に対向させてマグネッ
ト10が配置されており、[1つパワーピストン5の外
周部には、該マグネット10による電磁力の発生時に吸
引作用を受ける磁性部材11が設けられている。壕だ、
」二記ブレーキペグル1には、該ペダル1の踏込み時に
作動するブレーキスイッチ12が具備され、更に」1記
オーくレーティングロッド7には、該ロンドアの移動も
1゜、即ちパワーピストン5における磁性部材11の移
動量を検出するストローク検出器13が具備されている
。そして、第2図に示すように、」1記ブレーキスイッ
チ12から′の(8号A及びストローク検出器13から
の信号Bは制御回路14に入力され、    。
A magnet 10 is disposed on the hydraulic cylinder 2 side in the casing 4 so as to face the outer periphery of the power piston 5. A magnetic member 11 is provided that receives an attractive action when the . It's a trench.
The brake peggle 1 is equipped with a brake switch 12 that is activated when the pedal 1 is depressed, and the rating rod 7 is provided with a brake switch 12 that is activated when the pedal 1 is depressed. A stroke detector 13 that detects the amount of movement of the member 11 is provided. Then, as shown in FIG. 2, the signal B from the brake switch 12 and the stroke detector 13 is input to the control circuit 14.

ブレーキペダル1の踏込み時に、該回路14の動作によ
って磁性部材11の移動mに応じて調整された電流Cか
マグネット10に供給されるように構成されている。
When the brake pedal 1 is depressed, the current C adjusted according to the movement m of the magnetic member 11 is supplied to the magnet 10 by the operation of the circuit 14.

」―記の構成によれば、制動操作時、即ちブレーキペダ
ル1の踏み込み時に、オペレーティングロッド7、パワ
ーピストン5及びブツシュロッド9を介して油圧シリン
ダ2におけるピストン8がa方向に押動される。
According to the configuration described in "-", during a braking operation, that is, when the brake pedal 1 is depressed, the piston 8 in the hydraulic cylinder 2 is pushed in the direction a via the operating rod 7, the power piston 5, and the bushing rod 9.

また、これ表向時に、ブレーキスイッチ12が上記ブレ
ーキペダル1の踏込みを検出し、信号Aによって制御回
路14を動作させることにより、該回路14が制動倍力
装置3におけるマグネット10に電流Cを供給する。そ
のため、該マグネット10が」1記パワーピストン5の
外周部における磁性部イ:′A11に電磁力を及ぼし、
該部組11を介してパワーピストン5をa・方向に吸引
する。これにより、油圧シリンダ2におけるピストン8
は1、に記ブレーキペダル1に加えられた踏込み力とパ
ワーシリンダ5に作用する電磁力とによって押動される
ことになり、該シリンダ2から吐出される制動油圧を介
して図示しないホイールに装着された制動装置に強い制
UJ力が発生する。
Also, when this is turned on, the brake switch 12 detects the depression of the brake pedal 1 and operates the control circuit 14 based on the signal A, so that the circuit 14 supplies a current C to the magnet 10 in the brake booster 3. do. Therefore, the magnet 10 exerts an electromagnetic force on the magnetic part A11 on the outer circumference of the power piston 5,
The power piston 5 is attracted in the direction a through the subassembly 11. As a result, the piston 8 in the hydraulic cylinder 2
is pushed by the depression force applied to the brake pedal 1 described in 1. and the electromagnetic force acting on the power cylinder 5, and is attached to a wheel (not shown) via the braking hydraulic pressure discharged from the cylinder 2. A strong braking force is generated in the brake system.

然して、上記制御回1@ 14からマグネツ)10に供
給される電流Cは、ストローク検出器13から該回路1
4に入力される磁性部桐11のストロークを示す信りB
に基いて、そのストロークに対して一定の特性を示すよ
うに調整されている。従って、例えば、該電流Cの電流
値Iがマグネット10と磁性部材11との距[Lに対し
てI〜Lとなるように設定しておけば、電磁力Fは、F
〜■/ L2で示されるから、磁性部材11にはそのス
トロークに拘らず一定の電磁力が作用し、捷た、I〜L
(!:すれば、磁性部拐11にマグネット10に近つく
程大きな電磁力が作用する等、ブレーキペダル1の踏込
力に加算される電磁力か1該ペダルの踏込み量に応じて
自由に制御されることになる。
Therefore, the current C supplied from the control circuit 1@14 to the magnet 10 is transmitted from the stroke detector 13 to the circuit 1.
A belief B indicating the stroke of the magnetic part paulownia 11 inputted in 4.
The stroke is adjusted to have certain characteristics based on the stroke. Therefore, for example, if the current value I of the current C is set to be I to L with respect to the distance [L between the magnet 10 and the magnetic member 11, the electromagnetic force F is
~■/ Since it is indicated by L2, a constant electromagnetic force acts on the magnetic member 11 regardless of its stroke, and it bends, I~L
(!: Then, the closer the magnetic brake pedal 11 is to the magnet 10, the greater the electromagnetic force acts on it, and the electromagnetic force added to the depression force of the brake pedal 1 can be freely controlled according to the amount of depression of the brake pedal 1. will be done.

このようにして、制動倍力装置3の倍力特性が任意に設
定可能さなる。
In this way, the boosting characteristics of the brake booster 3 can be set arbitrarily.

ここで、上記実施例においては、パワーピストン5の外
周部に磁性部材11を設ける構成としだが、該ピストン
5の全体を磁性材料で形成してもよい。
Here, in the above embodiment, the magnetic member 11 is provided on the outer circumference of the power piston 5, but the entire piston 5 may be formed of a magnetic material.

また、第3図に示すように、パワーピストン5′におけ
る磁性部材11’かマグネット10内を移動する構成と
する等、マグネット及び磁性部材の形状や位置関係等の
構成、或は制御回路14における信号Bに対する電流C
の調整方法等は、目的とする倍力特性にSじて適宜設定
すればよい。
In addition, as shown in FIG. 3, the configuration of the shape and positional relationship of the magnet and the magnetic member, such as a configuration in which the magnetic member 11' of the power piston 5' moves within the magnet 10, or the configuration of the control circuit 14, etc. Current C for signal B
The adjustment method and the like may be set as appropriate depending on the target boosting characteristics.

尚、第4図はプレーキスインチ12′及びストローク検
出器13′を含む制御回路14′の具体的構成例を示す
もので、検出器13′はオペンーティングロツド7に固
着されたシュー13a′と該シュー13 a’が摺接す
るコイル13bとから成る可変抵抗器によって構成され
ている。これにより、マグネツ)10に磁性部材11の
ストロークに応じて変化する電流が供給されるのである
が、この例においては、上記コイル13b′の巻線の密
度を異ならせることによりストロークに対する電流値の
調整が行われる。
Incidentally, FIG. 4 shows a specific example of the configuration of the control circuit 14' including the stroke inch 12' and the stroke detector 13'. ' and a coil 13b in sliding contact with the shoe 13a'. As a result, a current that changes according to the stroke of the magnetic member 11 is supplied to the magnet 10. In this example, by varying the winding density of the coil 13b', the current value with respect to the stroke is changed. Adjustments will be made.

以」二のように、本発明に係る制動倍力装置によれば、
ブレーキペダルの踏込力が電磁力によって増強されて制
動油圧供給用の油圧シリンダに伝達されることになる。
As shown in (2) below, according to the brake booster according to the present invention,
The depression force of the brake pedal is increased by electromagnetic force and is transmitted to the hydraulic cylinder for supplying brake hydraulic pressure.

従って、走行中におけるエンジンが停止した状態での制
動時にも倍力作用が得られると共に、過給機付きエンジ
ンを塔載した自動車や電気自動車等にも適用できる等、
従来のエンジン吸入負圧を利用した制f肋(高力装置に
比較して適用車種が著しく拡大される。特に、」1記電
磁力をブレーキペダルの踏込みJT、に応じて調整する
ことによって任意の倍力特性が得られるから、新型の制
動力が最適の操作性で得られることになる。
Therefore, a boosting effect can be obtained even when braking while the engine is stopped while driving, and it can also be applied to cars equipped with a supercharged engine, electric cars, etc.
The range of applicable vehicles is significantly expanded compared to the conventional f-control system (high-force device) that utilizes engine suction negative pressure. Since the boosting characteristics of the new model can be obtained, the braking force of the new model can be obtained with optimal operability.

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

第1図は本考案の実施例を示す制動倍力装置の縦断側面
図、第2図は該実施側の制御手段を示すブロック図、第
3図は他の実施例の要部縦断側面図、第4図は制御回路
の具体例を示す電気回路図である。 1・・・ブレーキペダル、2・・・油圧シリンダ、3・
・制動倍力装置、10.10′・マグネット、11.1
1・・・磁性部材、12.12・・・ブレーキスイッチ
、13.13・・ストロ−7検出器、14.14 制御
回路。 出願人   東洋工業株式会社
FIG. 1 is a longitudinal sectional side view of a brake booster showing an embodiment of the present invention, FIG. 2 is a block diagram showing the control means of the implementation side, and FIG. 3 is a longitudinal sectional side view of main parts of another embodiment. FIG. 4 is an electric circuit diagram showing a specific example of the control circuit. 1...Brake pedal, 2...Hydraulic cylinder, 3.
・Brake booster, 10.10'・Magnet, 11.1
DESCRIPTION OF SYMBOLS 1... Magnetic member, 12.12... Brake switch, 13.13... Stroke 7 detector, 14.14 Control circuit. Applicant: Toyo Kogyo Co., Ltd.

Claims (1)

【特許請求の範囲】[Claims] (1)  ホイールに装着された制動装置に制動油圧を
供給する油圧シリンダとブレーキペダルとの間に介設さ
れ、ブレーキペダルの踏込力を増強して」二記油圧シリ
ンダのピストンに伝達する制動倍力装置であって、上記
ブレーキペダルの踏込みに応じて往復ωJする磁性部材
と、該磁性部材に対して制動方向の電磁力を及ぼすよう
に該磁性部材の近傍に配置されたマグネットさを有する
ト共に、ブレーキペダルの踏込みを検出するブレーキス
イッチによって作動し、11つ上記磁性部材の移動量を
検出するストローク検出器からの信号に基いて、予め設
定された倍力特性を得るように上記マグネットに対する
供給電流を調整する制御回路が備えられていることを特
徴とする自動車の制動倍力装置。
(1) A brake multiplier installed between the brake pedal and a hydraulic cylinder that supplies braking oil pressure to the braking device attached to the wheel, which increases the depression force of the brake pedal and transmits it to the piston of the hydraulic cylinder. The force device includes a magnetic member that reciprocates ωJ in response to depression of the brake pedal, and a magnet disposed near the magnetic member so as to exert an electromagnetic force in a braking direction on the magnetic member. Both are actuated by a brake switch that detects depression of the brake pedal, and are applied to the magnet so as to obtain a preset boosting characteristic based on signals from a stroke detector that detects the amount of movement of the eleven magnetic members. A brake booster for an automobile, characterized in that it is equipped with a control circuit that adjusts a supply current.
JP57139629A 1982-08-10 1982-08-10 Brake booster for automobile Pending JPS5929553A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP57139629A JPS5929553A (en) 1982-08-10 1982-08-10 Brake booster for automobile

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP57139629A JPS5929553A (en) 1982-08-10 1982-08-10 Brake booster for automobile

Publications (1)

Publication Number Publication Date
JPS5929553A true JPS5929553A (en) 1984-02-16

Family

ID=15249725

Family Applications (1)

Application Number Title Priority Date Filing Date
JP57139629A Pending JPS5929553A (en) 1982-08-10 1982-08-10 Brake booster for automobile

Country Status (1)

Country Link
JP (1) JPS5929553A (en)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2003102526A1 (en) * 2002-06-03 2003-12-11 Matsushita Electric Industrial Co., Ltd. Load sensor
KR100748738B1 (en) * 2006-06-20 2007-08-13 현대자동차주식회사 Active acceleration pedal
JP2012240648A (en) * 2011-05-24 2012-12-10 Advics Co Ltd Brake device for vehicle
KR101223069B1 (en) 2011-05-30 2013-01-17 (주) 디에이치홀딩스 Activity Operation type Eco Pedal Apparatus
WO2016194582A1 (en) * 2015-05-29 2016-12-08 日立オートモティブシステムズ株式会社 Electric booster
CN110015276A (en) * 2018-01-06 2019-07-16 北京华田汽车科技有限公司 Electromagnetic braking and friction catch can independent control automobile double braking system

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2003102526A1 (en) * 2002-06-03 2003-12-11 Matsushita Electric Industrial Co., Ltd. Load sensor
US7121154B2 (en) 2002-06-03 2006-10-17 Matsushita Electric Industrial Co., Ltd. Load sensor having hourglass-shaped coil spring
KR100748738B1 (en) * 2006-06-20 2007-08-13 현대자동차주식회사 Active acceleration pedal
JP2012240648A (en) * 2011-05-24 2012-12-10 Advics Co Ltd Brake device for vehicle
KR101223069B1 (en) 2011-05-30 2013-01-17 (주) 디에이치홀딩스 Activity Operation type Eco Pedal Apparatus
WO2016194582A1 (en) * 2015-05-29 2016-12-08 日立オートモティブシステムズ株式会社 Electric booster
US10647307B2 (en) 2015-05-29 2020-05-12 Hitachi Automotive Systems, Ltd. Electric booster
CN110015276A (en) * 2018-01-06 2019-07-16 北京华田汽车科技有限公司 Electromagnetic braking and friction catch can independent control automobile double braking system
CN110015276B (en) * 2018-01-06 2021-02-26 北京华田汽车科技有限公司 Automobile double-brake system with electromagnetic brake and friction brake capable of being independently controlled

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