DE3721626A1 - Motor vehicle with four-wheel drive - Google Patents

Motor vehicle with four-wheel drive

Info

Publication number
DE3721626A1
DE3721626A1 DE19873721626 DE3721626A DE3721626A1 DE 3721626 A1 DE3721626 A1 DE 3721626A1 DE 19873721626 DE19873721626 DE 19873721626 DE 3721626 A DE3721626 A DE 3721626A DE 3721626 A1 DE3721626 A1 DE 3721626A1
Authority
DE
Germany
Prior art keywords
clutch
wheels
motor vehicle
wheel drive
axle
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.)
Granted
Application number
DE19873721626
Other languages
German (de)
Other versions
DE3721626C2 (en
Inventor
Juergen Dipl Ing Stockmar
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.)
Steyr Daimler Puch AG
Original Assignee
Steyr Daimler Puch AG
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 Steyr Daimler Puch AG filed Critical Steyr Daimler Puch AG
Publication of DE3721626A1 publication Critical patent/DE3721626A1/en
Application granted granted Critical
Publication of DE3721626C2 publication Critical patent/DE3721626C2/de
Granted 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
    • 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
    • B60T8/32—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force responsive to a speed condition, e.g. acceleration or deceleration
    • B60T8/321—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force responsive to a speed condition, e.g. acceleration or deceleration deceleration
    • B60T8/322—Systems specially adapted for vehicles driven by more than one axle, e.g. Four Wheel-Drive vehicles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
    • B60K23/00—Arrangement or mounting of control devices for vehicle transmissions, or parts thereof, not otherwise provided for
    • B60K23/08—Arrangement or mounting of control devices for vehicle transmissions, or parts thereof, not otherwise provided for for changing number of driven wheels, for switching from driving one axle to driving two or more axles
    • B60K23/0808—Arrangement or mounting of control devices for vehicle transmissions, or parts thereof, not otherwise provided for for changing number of driven wheels, for switching from driving one axle to driving two or more axles for varying torque distribution between driven axles, e.g. by transfer clutch

Landscapes

  • Engineering & Computer Science (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Arrangement And Driving Of Transmission Devices (AREA)

Abstract

In the drive train (3) between the two axles (4, 5), a motor vehicle with four-wheel drive has a frictional clutch (6). This clutch (6) can be controlled by means of a control element (7). In order to improve the braking behaviour of the motor vehicle and reduce the risk of lock-up by relatively simple means, the clutch (6) can be operated with the aid of at least one rotational speed sensor (9) for the wheels of one axle (4; 5), the said sensor being connected to the control element (7). The intention is that the clutch (6) should be released if a predetermined gradient of the reduction in rotational speed is exceeded. If desired, the brake pressure for the wheels of the rear axle (5) can be reducible at the same time. <IMAGE>

Description

Die Erfindung betrifft ein Kraftfahrzeug mit Vier­ radantrieb, bei dem im Antriebsstrang zwischen den beiden Achsen eine über ein Stellglied steuerbare kraftschlüssige Kupplung eingebaut ist.The invention relates to a motor vehicle with four wheel drive, in the drive train between the two Axes a non-positive controlled by an actuator Coupling is installed.

Bei einem bekannten Kraftfahrzeug dieser Art (DE-OS 33 17 247) ist die steuerbare kraftschlüssige Kupp­ lung derart angeordnet und ausgebildet, daß eine durch Betätigen der Betriebsbremse hervorgerufene Verringerung der Umlaufgeschwindigkeit der Vorderräder nicht über den Antriebsstrang auf die Hinterräder übertragen wird, damit auf jeden Fall eine Blockierneigung der Vorderräder sich nicht auch auf die Hinterräder überträgt, weil beim Blockieren der Hinterräder deren Seitenführungskräfte verlorengehen und sich damit ein unstabiler Fahrzustand einstellt. Nach­ teilig ist dabei jedoch, daß die Drehmomentverbindung zwischen den beiden Achsen bei jedem Bremsvorgang unterbrochen wird, obwohl in vielen Betriebsfällen bei Drehmomentverbindung zwischen Vorder- und Hinterachse ein stabileres Brems­ verhalten des Fahrzeuges erreicht wird. In a known motor vehicle of this type (DE-OS 33 17 247) is the controllable friction clutch tion arranged and designed such that a through Applying the service brake caused reduction the rotational speed of the front wheels does not exceed the Drivetrain is transmitted to the rear wheels so on in any case a tendency of the front wheels to lock up also transfers to the rear wheels because when blocking the rear wheels whose cornering forces are lost and thus an unstable driving condition arises. After Part of it is, however, that the torque connection between the two axes are interrupted with each braking operation although in many cases with torque connection a more stable brake between the front and rear axles behavior of the vehicle is reached.  

Es sind auch schon Kraftfahrzeuge bekannt (DE-OS 33 02 936), bei denen in Abhängigkeit vom Schlupf zweier dauernd angetriebener Räder auf Vierradantrieb umgeschaltet wird und der Schlupf mit Hilfe von Dreh­ zahlsensoren durch Drehzahlvergleich der dauernd ange­ triebenen Räder mit den fallweise zuschaltbaren Rädern be­ stimmt wird. Hier wird aber im Normalbetrieb mit Zweirad­ antrieb gefahren und das Umschalten auf Vierradantrieb erfolgt nur bei erhöhtem Antriebsschlupf.Motor vehicles are also known (DE-OS 33 02 936), in which depending on the slip two permanently driven four-wheel drive wheels is switched and the slip with the help of rotation number sensors by continuously comparing the speed driven wheels with the occasionally switchable wheels is true. But here in normal operation with two-wheelers drive driven and switching to four-wheel drive only occurs when the drive slip is increased.

Schließlich sind zur Optimierung des Bremsverhaltens Fahrzeuge mit sogenanntem Antiblockiersystem bekannt, das verhältnismäßig komplizierte und aufwendige Einrichtungen erfordert und bei Vierradantrieb nicht unverändert anwend­ bar ist, weshalb in diesen Fällen bei jedem Bremsvorgang die Drehmomentübertragung zwischen den Achsen unterbrochen werden muß oder zusätzliche aufwendige Maßnahmen in den Einrichtungen des Antiblockiersystems getroffen werden müssen.Finally, to optimize braking behavior Vehicles with so-called anti-lock braking system known that relatively complicated and expensive facilities required and do not apply unchanged for four-wheel drive bar, which is why in these cases with every braking operation the torque transmission between the axes is interrupted must be or additional expensive measures in the Devices of the anti-lock braking system are taken have to.

Somit liegt der Erfindung die Aufgabe zugrunde, diese Mängel zu beseitigen und ein Kraftfahrzeug der eingangs geschilderten Art zu schaffen, bei dem mit verhältnismäßig einfachen Mitteln das Bremsverhalten verbessert bzw. die Blockiergefahr vermieden wird.The invention is therefore based on the object Eliminate defects and a motor vehicle of the beginning to create the kind described, with the proportionately simple means improve braking behavior or Blocking risk is avoided.

Die Erfindung löst die gestellte Aufgabe dadurch, daß die Kupplung mit Hilfe wenigstens eines an das Stellglied angeschlossenen Drehzahlsensors für die Räder einer Achse bei Überschreiten eines vorbestimmten Gradienten der Dreh­ zahlverringerung im Sinne des Lösens der Kupplung betätigbar und gegebenenfalls zugleich, wie an sich bekannt, der Brems­ druck für die Hinterräder senkbar ist.The invention solves the problem in that the clutch using at least one to the actuator connected speed sensor for the wheels one Axis when a predetermined gradient of rotation is exceeded Number reduction operable in the sense of releasing the clutch and if necessary, as is known per se, the brake pressure for the rear wheels can be lowered.

Da vierradgetriebene Fahrzeuge mit Drehmomentver­ bindung zwischen den beiden Achsen in fast allen Fällen ein stabileres Bremsverhalten als Fahrzeuge ohne eine solche Drehmomentverbindung der Achsen aufweisen, bleibt erfindungsgemäß die Kupplung im Normalbetrieb geschlossen. Ergibt sich aber eine sehr rasche Drehzahlverringerung an den Rädern einer Achse und damit auch am Antriebs­ strang zwischen den Achsen, was ein Anzeichen für starke Blockierneigung, insbesondere der Vorderräder, ist, so wird die Kupplung allmählich oder auch plötzlich gelöst und damit die Drehmomentübertragung zwischen den Achsen ver­ ringert oder unterbrochen, so daß die Hinterräder nicht auch zum Blockieren kommen. Die Verhinderung des Blockierens kann dann noch dadurch verstärkt werden, daß der Bremsdruck für die Hinterräder gesenkt wird, was selbstverständlich zur Voraussetzung hat, daß die Drehzahlerfassung zwischen der Kupplung und den Hinterrädern erfolgt. Sollte bei Anordnung je eines Bremskreises für die Vorder- und Hinter­ räder einer dieser Bremskreise ausfallen, so wird er­ findungsgemäß das verbleibende Bremsmoment dennoch auf alle vier Räder übertragen.Since four-wheel drive vehicles with torque ver bond between the two axes in almost all cases a more stable braking behavior than vehicles without one have such torque connection of the axles remains  According to the invention, the clutch is closed in normal operation. However, there is a very rapid reduction in speed the wheels of an axle and thus also on the drive stranded between the axes, which is a sign of strong The tendency to lock, especially the front wheels, is so the clutch is released gradually or suddenly and so that the torque transmission between the axes ver wrestles or breaks so that the rear wheels are not also come to blocking. The prevention of blocking can then be reinforced by the fact that the brake pressure for the rear wheels, which goes without saying has the requirement that the speed detection between the clutch and the rear wheels. Should at Arrangement of a brake circuit for the front and rear if one of these brake circuits fails, it will according to the invention, the remaining braking torque nevertheless transfer all four wheels.

Die Zeichnung zeigt als Ausführungsbeispiel ein erfindungsgemäßes Kraftfahrzeug im Schema.The drawing shows an exemplary embodiment Motor vehicle according to the invention in the diagram.

Das Kraftfahrzeug mit Vierradantrieb wird vom Motor 1 über ein Schaltgetriebe 2 angetrieben, wobei im Antriebs­ strang 3 zwischen der Vorderachse 4 und der Hinterachse 5 eine kraftschlüssige Kupplung 8 eingebaut ist, die mit Hilfe eines Stellgliedes 7 gesteuert werden kann. Der An­ triebsstrang 3 weist noch eine Meßscheibe 8 mit einem Sensor 9 zur Drehzahlerfassung der Räder einer Achse 4 oder 5 auf. Der Drehzahlsensor 9 ist an des Stellglied 7 angeschlossen, so daß bei Überschreiten eines vorbestimmten Gradienten der Drehzahlverringerung die Kupplung 6 im Sinne eines Lösens betätigt wird.The motor vehicle with four-wheel drive is driven by the engine 1 via a manual transmission 2 , with a non-positive clutch 8 being installed in the drive train 3 between the front axle 4 and the rear axle 5 , which clutch can be controlled with the aid of an actuator 7 . At the drive train 3 still has a measuring disc 8 with a sensor 9 for speed detection of the wheels of an axle 4 or 5 . The speed sensor 9 is connected to the actuator 7 , so that when a predetermined gradient of the speed reduction is exceeded, the clutch 6 is actuated in the sense of loosening.

Mit 10 ist der Hauptbremszylinder bezeichnet, von dem aus die Radbremsen 11 der Räder der Vorderachse 4 direkt beaufschlagt werden, wogegen die Leitung 12 zu den Rad­ bremsen 13 der Räder der Hinterachse 5 über einen Brems­ druckregler 14 geführt ist, der auch vom Stellglied 7 ge­ steuert wird, um beim Lösen der Kupplung 6 zugleich den Bremsdruck für die Räder der Hinterachse 5 abzusenken.With 10 of the master cylinder is referred to, from which the wheel brakes 11 of the wheels of the front axle 4 are directly applied, whereas the line 12 to the wheel brakes 13 of the wheels of the rear axle 5 is guided via a brake pressure regulator 14, which is also from the actuator 7 ge is controlled in order to simultaneously lower the brake pressure for the wheels of the rear axle 5 when the clutch 6 is released .

Der Drehzahlsensor könnte auch direkt der Vorder­ achse 4 zugeordnet sein.The speed sensor could also be assigned directly to the front axle 4 .

Claims (1)

Kraftfahrzeug mit Vierradantrieb, bei dem im Antriebsstrang zwischen den beiden Achsen eine über ein Stellglied steuerbare kraftschlüssige Kupplung einge­ baut ist, dadurch gekennzeichnet, daß die Kupplung (8) mit Hilfe wenigstens eines an das Stellglied (7) ange­ schlossenen Drehzahlsensors (9) für die Räder einer Achse (4; 5) bei Überschreiten eines vorbestimmten Gradienten der Drehzahlverringerung im Sinne des Lösens der Kupp­ lung (6) betätigbar und gegebenenfalls zugleich, wie an sich bekannt, der Bremsdruck für die Hinterräder senkbar ist.Motor vehicle with four-wheel drive, in which in the drive train between the two axles a controllable via an actuator non-positive clutch is built, characterized in that the clutch ( 8 ) with the help of at least one to the actuator ( 7 ) is connected speed sensor ( 9 ) for the Wheels of an axis ( 4 ; 5 ) when exceeding a predetermined gradient of the speed reduction in the sense of releasing the hitch be ( 6 ) actuated and optionally, as known per se, the brake pressure for the rear wheels can be lowered.
DE19873721626 1986-07-02 1987-06-30 Motor vehicle with four-wheel drive Granted DE3721626A1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
AT0178086A AT394686B (en) 1986-07-02 1986-07-02 MOTOR VEHICLE WITH FOUR-WHEEL DRIVE

Publications (2)

Publication Number Publication Date
DE3721626A1 true DE3721626A1 (en) 1988-01-07
DE3721626C2 DE3721626C2 (en) 1991-09-19

Family

ID=3520817

Family Applications (1)

Application Number Title Priority Date Filing Date
DE19873721626 Granted DE3721626A1 (en) 1986-07-02 1987-06-30 Motor vehicle with four-wheel drive

Country Status (4)

Country Link
JP (1) JPS6325134A (en)
AT (1) AT394686B (en)
DE (1) DE3721626A1 (en)
IT (1) IT1221929B (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3910483A1 (en) * 1988-03-31 1989-10-12 Nissan Motor BRAKE CONTROL DEVICE FOR MOTOR VEHICLES
EP0524157A1 (en) * 1991-07-18 1993-01-20 FIAT AUTO S.p.A. A vehicle with permanent four-wheel drive
WO2003086831A1 (en) * 2002-04-12 2003-10-23 Magna Steyr Powertrain Ag & Co Kg Motor vehicle equipped with a brake system and with a drive system
US10065501B2 (en) 2012-09-05 2018-09-04 Magna Powertrain Ag & Co Kg Control system for an all-wheel clutch

Families Citing this family (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH07205675A (en) * 1994-01-26 1995-08-08 Honda Motor Co Ltd Drive state selection control for vehicle equipped with antilock brake controller
US5694321A (en) 1994-11-25 1997-12-02 Itt Automotive Europe Gmbh System for integrated driving stability control
US5711024A (en) 1994-11-25 1998-01-20 Itt Automotive Europe Gmbh System for controlling yaw moment based on an estimated coefficient of friction
DE19515059A1 (en) 1994-11-25 1996-05-30 Teves Gmbh Alfred Vehicle ride stability regulator with limited reference yaw rate
US5732377A (en) 1994-11-25 1998-03-24 Itt Automotive Europe Gmbh Process for controlling driving stability with a yaw rate sensor equipped with two lateral acceleration meters
US5732379A (en) 1994-11-25 1998-03-24 Itt Automotive Europe Gmbh Brake system for a motor vehicle with yaw moment control
US5710704A (en) 1994-11-25 1998-01-20 Itt Automotive Europe Gmbh System for driving stability control during travel through a curve
US5701248A (en) 1994-11-25 1997-12-23 Itt Automotive Europe Gmbh Process for controlling the driving stability with the king pin inclination difference as the controlled variable
US5710705A (en) 1994-11-25 1998-01-20 Itt Automotive Europe Gmbh Method for determining an additional yawing moment based on side slip angle velocity
US5732378A (en) 1994-11-25 1998-03-24 Itt Automotive Europe Gmbh Method for determining a wheel brake pressure
US5742507A (en) 1994-11-25 1998-04-21 Itt Automotive Europe Gmbh Driving stability control circuit with speed-dependent change of the vehicle model
US5774821A (en) 1994-11-25 1998-06-30 Itt Automotive Europe Gmbh System for driving stability control
DE19712973B4 (en) * 1996-04-06 2008-11-13 Volkswagen Ag Method for controlling a controllable clutch in the drive train between a front axle and a rear axle of a motor vehicle with four-wheel drive
DE19706720A1 (en) * 1996-04-06 1997-10-09 Volkswagen Ag Controlling coupling between front and rear axles of motor vehicle with four wheel drive
DE10260196A1 (en) 2002-12-20 2004-07-01 Bayerische Motoren Werke Ag Method for controlling a switchable clutch in a drive train of a four-wheel drive motor vehicle
CN108639315A (en) * 2018-07-06 2018-10-12 安徽思源三轻智能制造有限公司 Undercarriage

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1918338A1 (en) * 1968-04-22 1969-10-30 Nippon Denso Company Ltd Anti-skid control system for motor vehicles
DE1580079B1 (en) * 1966-07-14 1970-07-09 Kloeckner Humboldt Deutz Ag Actuating device for the drive and the brakes of a four-wheel drive vehicle
DE3302936A1 (en) * 1982-01-29 1983-08-18 Fuji Jukogyo K.K., Tokyo POWER TRANSMISSION ARRANGEMENT FOR A FOUR-WHEEL DRIVED MOTOR VEHICLE
DE3345294A1 (en) * 1982-12-15 1984-07-26 Fuji Jukogyo K.K., Tokio/Tokyo ARRANGEMENT FOR CONTROLLING THE POWER TRANSFER OF A FOUR WHEEL DRIVE VEHICLE
DE3317247A1 (en) * 1983-05-11 1984-11-15 Volkswagenwerk Ag, 3180 Wolfsburg MOTOR VEHICLE WITH 4WD DRIVE
DE3418520A1 (en) * 1984-05-18 1985-11-21 Teves Gmbh Alfred SLIP-CONTROLLED BRAKE SYSTEM FOR ROAD VEHICLES WITH ALL-WHEEL DRIVE
DE3538351A1 (en) * 1985-10-29 1987-04-30 Teves Gmbh Alfred BRAKE SYSTEM WITH ANTI-BLOCK PROTECTION FOR ALL-WHEEL DRIVE MOTOR VEHICLES

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6064035A (en) * 1983-09-19 1985-04-12 Fuji Heavy Ind Ltd Selection control device for four-wheel drive vehicle

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1580079B1 (en) * 1966-07-14 1970-07-09 Kloeckner Humboldt Deutz Ag Actuating device for the drive and the brakes of a four-wheel drive vehicle
DE1918338A1 (en) * 1968-04-22 1969-10-30 Nippon Denso Company Ltd Anti-skid control system for motor vehicles
DE3302936A1 (en) * 1982-01-29 1983-08-18 Fuji Jukogyo K.K., Tokyo POWER TRANSMISSION ARRANGEMENT FOR A FOUR-WHEEL DRIVED MOTOR VEHICLE
DE3345294A1 (en) * 1982-12-15 1984-07-26 Fuji Jukogyo K.K., Tokio/Tokyo ARRANGEMENT FOR CONTROLLING THE POWER TRANSFER OF A FOUR WHEEL DRIVE VEHICLE
DE3317247A1 (en) * 1983-05-11 1984-11-15 Volkswagenwerk Ag, 3180 Wolfsburg MOTOR VEHICLE WITH 4WD DRIVE
DE3418520A1 (en) * 1984-05-18 1985-11-21 Teves Gmbh Alfred SLIP-CONTROLLED BRAKE SYSTEM FOR ROAD VEHICLES WITH ALL-WHEEL DRIVE
DE3538351A1 (en) * 1985-10-29 1987-04-30 Teves Gmbh Alfred BRAKE SYSTEM WITH ANTI-BLOCK PROTECTION FOR ALL-WHEEL DRIVE MOTOR VEHICLES

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3910483A1 (en) * 1988-03-31 1989-10-12 Nissan Motor BRAKE CONTROL DEVICE FOR MOTOR VEHICLES
US5019985A (en) * 1988-03-31 1991-05-28 Nissan Motor Company, Limited Anti-skid brake control system for automotive vehicle, particularly for vehicle having selective two-wheel and four-wheel drive power train
EP0524157A1 (en) * 1991-07-18 1993-01-20 FIAT AUTO S.p.A. A vehicle with permanent four-wheel drive
WO2003086831A1 (en) * 2002-04-12 2003-10-23 Magna Steyr Powertrain Ag & Co Kg Motor vehicle equipped with a brake system and with a drive system
US7694790B2 (en) 2002-04-12 2010-04-13 Magna Drivetrain Ag & Co Kg Motor vehicle equipped with an integrated brake and clutch control system
US10065501B2 (en) 2012-09-05 2018-09-04 Magna Powertrain Ag & Co Kg Control system for an all-wheel clutch

Also Published As

Publication number Publication date
JPS6325134A (en) 1988-02-02
IT1221929B (en) 1990-08-31
DE3721626C2 (en) 1991-09-19
ATA178086A (en) 1991-11-15
AT394686B (en) 1992-05-25
IT8721148A0 (en) 1987-07-01

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