DE3238882A1 - Vacuum generation for a combustion engine - Google Patents

Vacuum generation for a combustion engine

Info

Publication number
DE3238882A1
DE3238882A1 DE19823238882 DE3238882A DE3238882A1 DE 3238882 A1 DE3238882 A1 DE 3238882A1 DE 19823238882 DE19823238882 DE 19823238882 DE 3238882 A DE3238882 A DE 3238882A DE 3238882 A1 DE3238882 A1 DE 3238882A1
Authority
DE
Germany
Prior art keywords
vacuum
throttle valve
brake booster
negative pressure
brake
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.)
Withdrawn
Application number
DE19823238882
Other languages
German (de)
Inventor
Alfred Dipl.-Ing.(FH) 7257 Ditzingen Wieland
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.)
WIELAND ALFRED DIPL ING FH
Original Assignee
WIELAND ALFRED DIPL ING FH
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 WIELAND ALFRED DIPL ING FH filed Critical WIELAND ALFRED DIPL ING FH
Priority to DE19823238882 priority Critical patent/DE3238882A1/en
Priority to DE19833324890 priority patent/DE3324890A1/en
Publication of DE3238882A1 publication Critical patent/DE3238882A1/en
Withdrawn legal-status Critical Current

Links

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
    • B60T17/00—Component parts, details, or accessories of power brake systems not covered by groups B60T8/00, B60T13/00 or B60T15/00, or presenting other characteristic features
    • B60T17/02—Arrangements of pumps or compressors, or control devices therefor
    • 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
    • B60T13/00—Transmitting 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
    • B60T13/10—Transmitting 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 fluid assistance, drive, or release
    • B60T13/24—Transmitting 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 fluid assistance, drive, or release the fluid being gaseous
    • B60T13/46—Vacuum systems
    • B60T13/52—Vacuum systems indirect, i.e. vacuum booster units
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B3/00—Engines characterised by air compression and subsequent fuel addition
    • F02B3/06—Engines characterised by air compression and subsequent fuel addition with compression ignition
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D9/00—Controlling engines by throttling air or fuel-and-air induction conduits or exhaust conduits
    • F02D9/02—Controlling engines by throttling air or fuel-and-air induction conduits or exhaust conduits concerning induction conduits
    • F02D2009/0201—Arrangements; Control features; Details thereof
    • F02D2009/024—Increasing intake vacuum

Landscapes

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

Abstract

Most passenger motor vehicles are nowadays equipped with vacuum-operated brake boosters. In the case of diesel engines the vacuum required for the brake boosters is generated by special vacuum pumps which are relatively expensive and unnecessarily consume energy for their constant drive. These vacuum pumps are replaced cost-effectively by the invention in that the vacuum required for the brake boosters is generated in the air intake duct of the diesel engine, to which duct the brake booster is connected. For this purpose a throttle valve is arranged in the air intake duct, which valve is closed by means of a vacuum switch when the required vacuum for the brake booster is not sufficient. It is opened when an adequate vacuum is present.

Description

Unterdruck-Erzeugung bei einem Vacuum generation at one

Verbrennungsmotor Die Erfindung betrifft die Unterdruck-Erzeugung bei einem Verbrennungsmotor, insbesondere Diesel-Motor, für eine Kraftfahrzeug-Bremsanlage mit einem auf einen hauptbremszylinder wirkenden Bremskraftverstärker, dessen Zusatzkraft aus der Druckdifferenz zwischen einem Unterdruck und dem atmosphärischen Druck resultiert. Internal combustion engine The invention relates to the generation of negative pressure in the case of an internal combustion engine, in particular a diesel engine, for a motor vehicle brake system with a brake booster acting on a master brake cylinder, its additional force results from the pressure difference between a negative pressure and the atmospheric pressure.

Die meisten Personen-Kraftfahrzeuge sind heute mit unterdruckbetätigten Bremskraftverstärkern ausgerüstet. Bei Otto-Motoren wird der Unterdruck für die Bremskraftverstärker im Ansaugstutzen des Vergasers erzeugt, bei Diesel-Motoren durch besondere Unterdruckpumpen, die mechanisch vom Fahrzeugmotor angetrieben werden.Most passenger vehicles today are vacuum operated Equipped with brake boosters. In Otto engines, the negative pressure for the Brake booster generated in the intake manifold of the carburetor in diesel engines by special vacuum pumps that are mechanically driven by the vehicle engine.

Bei der bekannten Unterdruck-Erzeugung mittels Unterdruckpumpen ist als nachteilig anzusehen, daß sie in ihrer Herstellung durch hohen Material-und Fertigungsaufwand verhältnismäßig teuer ist.In the known negative pressure generation by means of negative pressure pumps to be regarded as disadvantageous that they are made by high material and Manufacturing effort is relatively expensive.

Da der Bedarf an Unterdruck für die Bremskraftverstärker in der Regel sehr gering ist und nur dann auftritt, wenn das Fahrzeug abgebremst werden muß, ist weiter von Nachteil, daß die Unterdruckpumpen ständig angetrieben werden. Dadurch ist eine Blindleistung erforderlich, die einen unnötigen Energieverbrauch zur Folge hat und zu verschleißbedingten Abnützungen führt.Because the need for vacuum for the brake booster in is usually very low and only occurs when the vehicle is braked must, is further disadvantageous that the vacuum pumps are constantly driven. As a result, reactive power is required, which leads to unnecessary energy consumption and leads to wear and tear.

Der Erfindung liegt die Aufgabe zugrunde, eine Unterdruck-Erzeugung zu schaffen, die gegenüber den bekannten Unterdruckpumpen mit wesentlich geringeren Herstellkosten gefertigt werden kann, die betriebssicher ist und einem geringen Verschleiß unterliegt, so daß die Lebensdauer der Verbrennungsmotoren beträchtlich überschritten wird.The invention is based on the object of generating a vacuum to create that compared to the known vacuum pumps with significantly lower Manufacturing costs can be manufactured, which is operationally reliable and low Is subject to wear, so that the service life of internal combustion engines is considerable is exceeded.

Diese Aufgabe wird erfindungsgemäß dadurch gelöst, daß im Luftansaugkanal des Verbrennungsmotors eine Drosselklappe angeordnet ist, daß zwischen der Drosselklappe und dem Verbrennungsmotor am Luftansaugkanal die Unterdruckleitung des Bremskraftverstärkers angeschlossen ist, daß die Drosselklappe bei nicht ausreichendem Unterdruck im Bremskraftverstärker geschlossen und bei ausreichendem Unterdruck geöffnet ist.This object is achieved according to the invention in that in the air intake duct of the internal combustion engine, a throttle valve is arranged that between the throttle valve and the vacuum line of the brake booster to the combustion engine on the air intake duct is connected that the throttle valve when there is insufficient vacuum in the brake booster is closed and opened when there is sufficient vacuum.

Um eine besonders betriebssichere Unterdruck-Erzeugung zu erhalten, ist die Erfindung so ausgebildet, daß die Steuerung der Drosselklappe durch einen mit der Unterdruckleitung des Bremskraftverstärkers verbundenen Unterdruckschalter erfolgt, der bei nicht ausreichendem Unterdruck im Bremskraftverstärker die Drosselklappe schließt und bei ausreichendem Unterdruck öffnet.In order to obtain a particularly reliable negative pressure generation, the invention is designed so that the control of the throttle valve by a vacuum switch connected to the vacuum line of the brake booster takes place, the throttle valve if there is insufficient vacuum in the brake booster closes and opens when there is sufficient negative pressure.

Eine weitere vorteilhafte Ausbildung der Erfindung besteht darin, daß beim Öffnen der Drosselklappe bevor sie ihre geöffnete Endlage einnimmt ein höherer Unterdruck im Bremskraftverstärker erforderlich ist als in ihrer geöffneten Endlage.Another advantageous embodiment of the invention consists in that when you open the throttle before it assumes its open end position higher vacuum is required in the brake booster than in its open End position.

Durch diese Ausbildung der Erfindung wird erreicht, daß die Drosselklappe im Luftansaugkanal bei ausreichendem Unterdruck im Bremskraftverstärker eine parallele Lage zum Luftstrom einnimmt. Bei entsprechender aerodynamischer Formgebung der Drosselklappe wird dadurch der geringst mögliche Luftwiderstand erreicht. Außerdem bewirkt diese Ausbildung der Erfindung eine Verbreiterung der Hysteresecharakteristik des Unterdruckschalters, wodurch dessen Schaltungsintervalle reduziert werden.This embodiment of the invention ensures that the throttle valve a parallel in the air intake duct if there is sufficient vacuum in the brake booster Position to the air flow. With a corresponding aerodynamic design of the throttle valve this achieves the lowest possible air resistance. It also causes this Formation of the invention a broadening of the hysteresis characteristics of the vacuum switch, whereby its switching intervals are reduced.

Die mit der Erfindung erzielten Vorteile bestehen darin, daß eine besonders betriebssichere und energiesparende Einrichtung geschaffen wird, die ein geringes Gewicht hat, die nur bei nicht ausreichendem Unterdruck in Funktion tritt und damit kaum einem Verschleiß unterliegt, die wegen ihrer geringen Anzahl von Einzelteilen, die in Massenproduktion in einfachen Fertigungstechnologien in verhältnismäßig groben Toleranzen gefertigt werden können, zu einem Bruchteil der bisherigen Kosten von Unterdruckpumpen hergestellt werden kann.The advantages achieved by the invention are that a A particularly reliable and energy-saving facility is created that has a has a low weight, which only comes into operation when there is insufficient negative pressure and is therefore hardly subject to wear because of their low number of Items that are mass-produced in simple manufacturing technologies can be manufactured in relatively coarse tolerances, at a fraction the previous cost of vacuum pumps can be produced.

Ein Ausführungsbeispiel der Erfindung ist in der schematischen Zeichnung dargestellt und wird im folgenden näher beschrieben.An embodiment of the invention is shown in the schematic drawing and is described in more detail below.

Es zeigen Fig. 1 eine Gesamtdarstellung der Erfindung Fig. 2 Stellung der Drosselklappe mit Unterdruckschalter bei nicht ausreichendem Unterdruck im Bremskraftverstärker Fig. 3 Stellung der Drosselklappe mit Unterdruckschalter bei ausreichendem Unterdruck im Bremskraftverstärker Beim Betrieb des Verbrennungsmotors 2 strömt Luft im Luftansaugkanal 1, der den Luftfilter 3 mit dem Verbrennungsmotor 2 verbindet. In Fig. 1 und Fig. 2 ist die Drosselklappe 4.in geschlossenem Zustand dargestellt, was zwischen Drosselklappe 4 und Verbrennungsmotor 2 im Luftansaugkanal 1 gegenüber dem atmosphärischem Druck zu einem Unterdruck führt. Dieser Unterdruck wird mittels einer Unterdruckleitung 10, die an den Anschlußstutzen 13 des Luftansaugkanals 1 angeschlossen ist, und dem Rückschlagventil 12 dem Bremskraftverstärker 16 zugeführt. An diesen ist der Hauptbremszylinder 15 angeschlossen, der über die Bremsleitungen 17 auf die Radbremszylinder 18 wirkt. An die Unterdruckleitung 10 des Bremskraftverstärkers 16 ist mittels des T-Stücks 14 und der Unterdruckleitung 11 der Unterdruckschalter 8 angeschlossen. Dieser ist mit der Stange 9 mit der Drosselklappe 4 verbunden. Bei nicht ausreichendem Unterdruck im Bremskraftverstärker 16 wird mittels der Druckfeder 20 die Membrane 19 mit der Stange 9 nach außen gedrückt und, unterstützt durch die Zugfeder 7, die Drosselklappe 4 geschlossen bis sie am Zu-Anschlag 15 anliegt. Dies führt zur Bildung eines Unterdrucks im stromabwärtigen Teil des Luftansaugkanals 1. Uber den Anschlußstutzen 13 wird der Unterdruck an den Bremskraftverstärker 16 und den Unterdruckschalter 8 geleitet, so daß dieser evakuiert wird und die Drosselklappe 4 öffnet bis sie am Auf-Anschlag 6 zur Anlage kommt. Die Befestigungspunkte der Zugfeder 7 an der Drosselklappe 4 bzw. an einem festen Motorenteil sind so angeordnet, daß beim Öffnen der Drosselklappe 4 kurz bevor diese am Auf-Anschlag Ç anliegt die Schließwirkung der Zugfeder 7 auf die Drosselklappe 4 in eine O£fnungswirkung geändert wird. Durch diesen Schnappeffekt wird einmal die Hysteresecharakteristik des Unterdruckschalters 8 verbreitert, so daß die Schaltintervalle reduziert werden, und zum anderen eine stabile, stromparallele Offen-Lage der Drosselklappe 4 erreicht.1 shows an overall representation of the invention, FIG. 2, position the throttle valve with vacuum switch if there is insufficient vacuum in the brake booster Fig. 3 Position of the throttle valve with vacuum switch when there is sufficient vacuum in the brake booster When the internal combustion engine 2 is operating, air flows in the air intake duct 1, which connects the air filter 3 to the internal combustion engine 2. In Fig. 1 and Fig. 2 the throttle valve 4 is shown in the closed state, which is between the throttle valve 4 and internal combustion engine 2 in the air intake duct 1 against atmospheric pressure leads to a negative pressure. This negative pressure is generated by means of a negative pressure line 10, which are connected to the connection piece 13 of the air intake duct 1 is, and fed to the check valve 12 to the brake booster 16. At this is the master cylinder 15 is connected, via the brake lines 17 to the Wheel brake cylinder 18 acts. To the vacuum line 10 of the brake booster 16 is the vacuum switch by means of the T-piece 14 and the vacuum line 11 8 connected. This is connected to the throttle valve 4 by the rod 9. If there is insufficient negative pressure in the brake booster 16, the compression spring 20 pressed the membrane 19 with the rod 9 to the outside and supported by the Tension spring 7, the throttle valve 4 closed until it rests against the closing stop 15. this leads to the formation of a negative pressure in the downstream part of the air intake duct 1. The negative pressure is applied to the brake booster 16 via the connection piece 13 and the vacuum switch 8 passed so that this is evacuated and the throttle valve 4 opens until it comes to rest against the open stop 6. The attachment points of the Tension springs 7 on the throttle valve 4 or on a fixed engine part are arranged in such a way that that when the throttle valve 4 is opened shortly before it hits the open stop Ç, the The closing effect of the tension spring 7 on the throttle valve 4 is changed to an opening effect will. This snap effect is the hysteresis characteristic of the vacuum switch 8th widened so that the switching intervals are reduced, and on the other hand one stable, current-parallel open position of the throttle valve 4 is reached.

Bezugsziffernliste 1 Luftansaugkanal 2 Verbrennungsmotor 3 Luftfilter 4 Drosselklappe 5 Zu-Anschlag 6 Auf-Anschlag 7 Zugfeder 8 Unterdruckschalter 9 Stange 10 Unterdruckleitung 11 Unterdruckleitung 12 Rückschlagventil 13 Anschlußstutzen 14 T-Stück 15 Hauptbremszylinder 16 Bremskraftverstärker 17 Bremsleitung 18 Radbremszylinder 19 Membrane 20 Druckfeder 3 Patentansprüche 2 Bl. Zeichnungen mit 3 Fig.LIST OF REFERENCE NUMERALS 1 air intake duct 2 internal combustion engine 3 air filter 4 Throttle valve 5 Closed stop 6 Open stop 7 Tension spring 8 Vacuum switch 9 Rod 10 vacuum line 11 vacuum line 12 check valve 13 connecting piece 14 T-piece 15 brake master cylinder 16 brake booster 17 brake line 18 wheel brake cylinder 19 membrane 20 compression spring 3 claims 2 sheets drawings with 3 figs.

1 Zusammenfassung Leerseite1. Summary Blank page

Claims (3)

Patentansprüche 1. Unterdruck-Erzeugung bei einem Verbrennungsmotor, insbesondere Diesel-Motor, fahrzeug-Bremsanlage mit einem auf einen Hauptbremszylinder wirkenden Bremskraftverstärker, dessen Zusatzkraft aus der Druckdifferenz zwischen einem Unterdruck und dem atmosphärischen Druck resultiert, dadurch gekennzeichnet, daß im Luftansaugkanal (1) des Verbrennungsmotors (2) eine Drosselklappe (4) angeordnet ist, daß zwischen der Drosselklappe (4) und dem Verbrennungsmotor (2) am Luftansaugkanal (1) die Unterdruckleitung (10) des Bremskraftverstärkers (16) angeschlossen ist, daß die Drosselklappe (4) bei nicht ausreichendem Unterdruck im Bremskraftverstärker (16) geschlossen und bei ausreichendem Unterdruck geöffnet ist. Claims 1. Negative pressure generation in an internal combustion engine, in particular diesel engine, vehicle brake system with one on a master brake cylinder acting brake booster, whose additional force from the pressure difference between a negative pressure and the atmospheric pressure, characterized in that, that a throttle valve (4) is arranged in the air intake duct (1) of the internal combustion engine (2) is that between the throttle valve (4) and the internal combustion engine (2) on the air intake duct (1) the vacuum line (10) of the brake booster (16) is connected, that the throttle valve (4) if there is insufficient vacuum in the brake booster (16) is closed and opened when there is sufficient vacuum. 2. Unterdruck-Erzeugung nach Anspruch 1, dadurch gekennzeichnet, daß die Steuerung der Drosselklappe (4) durch einen mit der Unterdruckleitung (10) des Bremskraftverstärkers (16) verbundenen Unterdruckschalter (8) erfolgt, der bei nicht ausreichendem Unterdruck im Bremskraftverstärker (16) die Drosselklappe (4) schließt und bei ausreichendem Unterdruck öffnet. 2. negative pressure generation according to claim 1, characterized in that that the control of the throttle valve (4) by a with the vacuum line (10) of the brake booster (16) connected vacuum switch (8) takes place at not sufficient vacuum in the brake booster (16) the The throttle valve (4) closes and opens when there is sufficient vacuum. 3. Unterdruck-Erzeugung nach Anspruch 1 und 2, dadurch gekennzeichnet, daß beim Öffnen der Drosselklappe (4) bevor sie ihre geöffnete Endlage einnimmt ein höherer Unterdruck im Bremskraftverstärker (16) erforderlich ist als in ihrer g,eöffneten Endlage.3. negative pressure generation according to claim 1 and 2, characterized in that that when you open the throttle valve (4) before it assumes its open end position a higher negative pressure in the brake booster (16) is required than in their g, opened end position.
DE19823238882 1982-10-21 1982-10-21 Vacuum generation for a combustion engine Withdrawn DE3238882A1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
DE19823238882 DE3238882A1 (en) 1982-10-21 1982-10-21 Vacuum generation for a combustion engine
DE19833324890 DE3324890A1 (en) 1982-10-21 1983-07-09 System for producing a partial vacuum in an internal combustion engine

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19823238882 DE3238882A1 (en) 1982-10-21 1982-10-21 Vacuum generation for a combustion engine

Publications (1)

Publication Number Publication Date
DE3238882A1 true DE3238882A1 (en) 1984-04-26

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DE19823238882 Withdrawn DE3238882A1 (en) 1982-10-21 1982-10-21 Vacuum generation for a combustion engine

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Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1993011983A1 (en) * 1991-12-18 1993-06-24 Wabco Automotive U.K. Limited Vacuum pump motor control apparatus and method of operation thereof
DE4202393A1 (en) * 1992-01-29 1993-08-05 Teves Gmbh Alfred Vacuum provision appts. for vehicular power-assisted braking - has two connections to servo amplifier from separate cylinder inlets, one of which has pneumatically operated restrictor
EP0829629A1 (en) * 1996-09-17 1998-03-18 Toyota Jidosha Kabushiki Kaisha Apparatus for controlling fuel injection in stratified charge combustion engine
EP0962371A1 (en) * 1998-06-02 1999-12-08 Toyota Jidosha Kabushiki Kaisha Negative pressure control apparatus for brake booster
US6046940A (en) * 1994-06-29 2000-04-04 Kabushiki Kaisha Toshiba Nonvolatile semiconductor memory device
WO2007006441A1 (en) * 2005-07-07 2007-01-18 Gm Global Technology Operations, Inc. Device for generating a vacuum in a motor vehicle
DE102010043381A1 (en) * 2010-11-04 2012-05-10 Continental Automotive Systems, Inc. Brake booster i.e. low pressure-operated active brake booster, system for motor car, has actuator controlling position of valve to maintain low pressure in booster, and controller outputting drive signal for actuator
DE102011006882A1 (en) 2011-04-06 2012-10-11 Bayerische Motoren Werke Aktiengesellschaft Vacuum piping for connecting brake booster of motor car with vacuum generator, has identical check valves that locks vacuum piping in direction of brake booster, and which are connected to respective ends of piping
DE102015211071A1 (en) 2015-06-17 2016-12-22 Bayerische Motoren Werke Aktiengesellschaft Brake booster

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5515676A (en) * 1991-12-18 1996-05-14 Wabco Automotive Uk Limited Vacuum pump motor control apparatus and method of operation thereof
WO1993011983A1 (en) * 1991-12-18 1993-06-24 Wabco Automotive U.K. Limited Vacuum pump motor control apparatus and method of operation thereof
DE4202393A1 (en) * 1992-01-29 1993-08-05 Teves Gmbh Alfred Vacuum provision appts. for vehicular power-assisted braking - has two connections to servo amplifier from separate cylinder inlets, one of which has pneumatically operated restrictor
US6046940A (en) * 1994-06-29 2000-04-04 Kabushiki Kaisha Toshiba Nonvolatile semiconductor memory device
EP0829629A1 (en) * 1996-09-17 1998-03-18 Toyota Jidosha Kabushiki Kaisha Apparatus for controlling fuel injection in stratified charge combustion engine
US5950594A (en) * 1996-09-17 1999-09-14 Toyota Jidosha Kabushiki Kaisha Apparatus for controlling fuel injection in stratified charge combustion engine
EP0962371A1 (en) * 1998-06-02 1999-12-08 Toyota Jidosha Kabushiki Kaisha Negative pressure control apparatus for brake booster
US6283559B1 (en) 1998-06-02 2001-09-04 Toyota Jidosha Kabushiki Kaisha Negative pressure control apparatus for brake booster
WO2007006441A1 (en) * 2005-07-07 2007-01-18 Gm Global Technology Operations, Inc. Device for generating a vacuum in a motor vehicle
CN101258310B (en) * 2005-07-07 2012-02-01 Gm全球科技运作股份有限公司 Device for producing partial vacuum in a motor vehicle
US8261716B2 (en) 2005-07-07 2012-09-11 GM Global Technology Operations LLC Device for generating a vacuum in a motor vehicle
DE102010043381A1 (en) * 2010-11-04 2012-05-10 Continental Automotive Systems, Inc. Brake booster i.e. low pressure-operated active brake booster, system for motor car, has actuator controlling position of valve to maintain low pressure in booster, and controller outputting drive signal for actuator
DE102011006882A1 (en) 2011-04-06 2012-10-11 Bayerische Motoren Werke Aktiengesellschaft Vacuum piping for connecting brake booster of motor car with vacuum generator, has identical check valves that locks vacuum piping in direction of brake booster, and which are connected to respective ends of piping
DE102015211071A1 (en) 2015-06-17 2016-12-22 Bayerische Motoren Werke Aktiengesellschaft Brake booster

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