DE4301986A1 - Active hydraulic system for road vehicle consisting of two hydraulic cylinders - Google Patents

Active hydraulic system for road vehicle consisting of two hydraulic cylinders

Info

Publication number
DE4301986A1
DE4301986A1 DE19934301986 DE4301986A DE4301986A1 DE 4301986 A1 DE4301986 A1 DE 4301986A1 DE 19934301986 DE19934301986 DE 19934301986 DE 4301986 A DE4301986 A DE 4301986A DE 4301986 A1 DE4301986 A1 DE 4301986A1
Authority
DE
Germany
Prior art keywords
forces
hydraulic system
active
phase
counter
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Withdrawn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
DE19934301986
Other languages
German (de)
Inventor
Hartmut Dipl Ing Dr Te Bathelt
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Priority to DE19934301986 priority Critical patent/DE4301986A1/en
Publication of DE4301986A1 publication Critical patent/DE4301986A1/en
Withdrawn legal-status Critical Current

Links

Classifications

    • 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
    • B60K5/00—Arrangement or mounting of internal-combustion or jet-propulsion units
    • B60K5/12—Arrangement of engine supports
    • B60K5/125—Telescopic supports, e.g. telescopic dampers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60G—VEHICLE SUSPENSION ARRANGEMENTS
    • B60G13/00—Resilient suspensions characterised by arrangement, location or type of vibration dampers
    • B60G13/16—Resilient suspensions characterised by arrangement, location or type of vibration dampers having dynamic absorbers as main damping means, i.e. spring-mass system vibrating out of phase
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60G—VEHICLE SUSPENSION ARRANGEMENTS
    • B60G17/00—Resilient suspensions having means for adjusting the spring or vibration-damper characteristics, for regulating the distance between a supporting surface and a sprung part of vehicle or for locking suspension during use to meet varying vehicular or surface conditions, e.g. due to speed or load
    • B60G17/015—Resilient suspensions having means for adjusting the spring or vibration-damper characteristics, for regulating the distance between a supporting surface and a sprung part of vehicle or for locking suspension during use to meet varying vehicular or surface conditions, e.g. due to speed or load the regulating means comprising electric or electronic elements
    • B60G17/0195—Resilient suspensions having means for adjusting the spring or vibration-damper characteristics, for regulating the distance between a supporting surface and a sprung part of vehicle or for locking suspension during use to meet varying vehicular or surface conditions, e.g. due to speed or load the regulating means comprising electric or electronic elements characterised by the regulation being combined with other vehicle control systems
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60G—VEHICLE SUSPENSION ARRANGEMENTS
    • B60G2202/00—Indexing codes relating to the type of spring, damper or actuator
    • B60G2202/20—Type of damper
    • B60G2202/25—Dynamic damper
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60G—VEHICLE SUSPENSION ARRANGEMENTS
    • B60G2202/00—Indexing codes relating to the type of spring, damper or actuator
    • B60G2202/40—Type of actuator
    • B60G2202/41—Fluid actuator
    • B60G2202/413—Hydraulic actuator
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60G—VEHICLE SUSPENSION ARRANGEMENTS
    • B60G2400/00—Indexing codes relating to detected, measured or calculated conditions or factors
    • B60G2400/30—Propulsion unit conditions
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60G—VEHICLE SUSPENSION ARRANGEMENTS
    • B60G2400/00—Indexing codes relating to detected, measured or calculated conditions or factors
    • B60G2400/60—Load

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Automation & Control Theory (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Transportation (AREA)
  • Vehicle Body Suspensions (AREA)
  • Vibration Prevention Devices (AREA)

Abstract

The hydraulic elements are regulated by the computer assisted regulating system to produce counter phase forces to the vibrational forces transmitted to the chassis and counter and cancel the vibrations of the bodywork excited by the roadway surface. The dynamic forces of the front and the rear axles are measured. The artificially produced counter-phase bodywork vibration pattern is so regulated by computer programming that the point of complete vibration elimination is adjusted at the front seats are with corresp. programme choice at the rear seats.

Description

Das theoretische Fahrkomfortziel für eine Fahrwerksabstimmung ist eine Karosserie, die frei von Schwingungen sich über eine unebene Fahrbahn bewegt. Dieses Ziel ist weder mit einem konventionellen noch mit einem aktiven Fahrwerk erreichbar, weilThe theoretical driving comfort goal for chassis tuning is a body that is free of Vibrations move across an uneven road surface. This goal is neither with one conventional still accessible with an active chassis because

  • 1. die dynamischen Kräfte zum Auf- und Abbeschleunigen der ungefederten Radmasse sich entweder an der Karosserie oder auf der Fahrbahn abstützen müssen, was zu dem bekannten Zielkonflikt zwischen Fahrkomfort und dynamischer Radlastschwankung führt und1. the dynamic forces to accelerate up and down the unsprung wheel mass itself have to be supported either on the body or on the road, leading to known conflict of objectives between driving comfort and dynamic wheel load fluctuation and
  • 2. die in der Praxis unvermeidbare Reibung im Stoßdämpfer - und in gleicher Weise in dem entsprechenden Hydraulikzylinder eines aktiven Fahrwerks - dazu führt, daß die Federung auf kleine Fahrbahnunebenheiten nicht anspricht.2. the inevitable friction in the shock absorber - and in the same way in the corresponding hydraulic cylinder of an active chassis - causes the suspension does not respond to small bumps in the road.

Das Einleiten dynamischer Kräfte in die Karosserie ist auf unebener Fahrbahn daher weder theoretisch noch praktisch zu vermeiden.The introduction of dynamic forces into the body is therefore neither on uneven road surfaces theoretically still to be avoided practically.

Der Erfindung liegt die Idee zugrunde, diese dynamischen Kräfte durch Gegenkräfte in ihrer Wirkung aufzuheben. Diese Gegenkräfte können von einem hydraulischen Schwingerreger erzeugt werden, das im wesentlichen aus 2 oder mehreren Hydraulikzylindern plus Servoventilen besteht, einem Regelkreis, der die dynamischen Fahrwerkskräfte mißt und entsprechende gegenphasige Schwingungssignale erzeugt, sowie einer Hydraulikpumpe, die notwendige Energie liefert.The invention is based on the idea of counteracting these dynamic forces in their Canceling effect. These opposing forces can be generated by a hydraulic vibration exciter which essentially consists of 2 or more hydraulic cylinders plus servo valves, a control loop that measures the dynamic chassis forces and corresponding antiphase Generates vibration signals, as well as a hydraulic pump that supplies the necessary energy.

Nach dem Prinzip actio = reactio müssen sich die hydraulisch erzeugten Kräfte an einer Gegenmasse abstützen, die in entgegengesetzter Richtung beschleunigt wird. Erfindungsgemäß kann das Antriebsaggregat als eine solche träge Masse dienen, die dann entsprechende Schwingbeschleunigungen ausführt. Man kann das Aggregat auch als Tilgermasse ansehen, die zufolge der Fahrwerkskräfte auf und ab bewegt wird, während die Karosserie in Ruhe bleibt. Zum Unterschied von einem passiven Schwingungstilger, dessen Wirkung sich auf eine einzige Frequenz beschränkt, funktioniert diese aktive, geregelte Schwingungsauslöschung über den gesamten Frequenzbereich des Karosserieschüttelns und -vibrierens von etwa 3 bis 30 Hz.According to the actio = reactio principle, the hydraulically generated forces have to act on one Support the counterweight that is accelerated in the opposite direction. According to the invention the drive unit can serve as such an inert mass, which then corresponds Performs vibration accelerations. One can also view the aggregate as an absorber mass according to the chassis forces is moved up and down while the body remains at rest. To the Difference from a passive vibration damper, the effect of which is on a single frequency limited, this active, controlled vibration cancellation works across the entire Body shaking and vibrating frequency range from about 3 to 30 Hz.

Ein praktisches Ausführungsbeispiel ist in Fig. 1 dargestellt, die einen Querschnitt durch den Vorbau eines Personenkraftwagens zeigt.A practical embodiment is shown in Fig. 1, which shows a cross section through the front of a passenger car.

Der Motor (2) ist mittels der Motorstützen (4) auf Konsolen (5) gelagert, die sich an den Längsträgern (3) der Karosserie abstützen. Die Gummimetallager der Motorlagerung sind in Fig. 1 der Übersichtlichkeit halber nicht gezeichnet. Zwischen der Motorstütze (4) und der Karosseriekonsole (5) ist auf jeder Seite je ein Hydraulikzylinder (1) montiert, dessen Servoventil vom Ausgangssignal eines rechnerunterstützten Regelsystems (10) gesteuert wird. Die von den Fahrbahnunebenheiten erregten Kräfte werden an der Haupteinleitungsstelle, im gezeichneten Fall am Federbeinstützlager, mit dem Kraftmeßelement (9) gemessen, welches das Eingangssignal für das Regelsystem (10) abgibt. Auf diese Weise werden zu den in die Karosserie eingeleiteten Kräften (8) gleichgroße gegenphasige Kräfte (6) erzeugt, die sich gegenseitig aufheben. Nach außen übrig bleiben lediglich die Reaktionskräfte (6) auf dem Motor, an dessen Trägermasse sich der Hydraulikzylinder (1) abstützt. Die Folge ist, daß auf unebener Fahrbahn die Karosserie in Ruhe bleibt und nur der Motor geschüttelt wird.The motor ( 2 ) is mounted on brackets ( 5 ) by means of the motor supports ( 4 ), which are supported on the side members ( 3 ) of the body. The rubber-metal bearings of the engine mount are not shown in Fig. 1 for the sake of clarity. A hydraulic cylinder ( 1 ) is mounted on each side between the engine support ( 4 ) and the body console ( 5 ), the servo valve of which is controlled by the output signal of a computer-aided control system ( 10 ). The forces excited by the bumps in the road are measured at the main point of introduction, in the illustrated case at the strut support bearing, with the force measuring element ( 9 ), which emits the input signal for the control system ( 10 ). In this way, forces of the same phase ( 6 ) are generated in relation to the forces ( 8 ) which are introduced into the body and which cancel each other out. All that remains on the outside are the reaction forces ( 6 ) on the motor, on the carrier mass of which the hydraulic cylinder ( 1 ) is supported. The result is that the body remains at rest on uneven road surfaces and only the engine is shaken.

Claims (3)

1. Aktives Hydrauliksystem für Straßenfahrzeuge, dadurch gekennzeichnet, daß
  • - mittels geregelter Hydraulikelemente gegenphasige Kräfte zu den vom Fahrwerk übertragenen Schwingungskräften erzeugt werden, die fahrbahnerregten Schwingungen der Karosserie auslöschen.
1. Active hydraulic system for road vehicles, characterized in that
  • - By means of controlled hydraulic elements, forces in phase opposition to the vibrational forces transmitted by the chassis are generated, which cancel out vibrations of the body caused by the road surface.
2. Aktives Hydrauliksystem nach Anspruch 1, dadurch gekennzeichnet, daß
  • - die Hydraulikelemente zwischen Karosserie und Antriebsaggregat eingebaut sind und sich die künstlich erzeugten gegenphasigen Kräfte an der trägen Masse des Aggregats abstützen.
2. Active hydraulic system according to claim 1, characterized in that
  • - The hydraulic elements are installed between the body and the drive unit and the artificially generated opposite-phase forces are supported on the inert mass of the unit.
3. Aktives Hydrauliksystem nach Anspruch 1 und 2, dadurch gekennzeichnet, daß
  • - die dynamischen Kräfte von Vorder- und Hinterachse meßtechnisch erfaßt werden und per Rechnerprogramm die künstlich erzeugte gegenphasige Karosserieschwingungsform so geregelt wird, daß sich der Punkt völliger Schwingungsauslöschung bei den Vordersitzen oder bei entsprechender Programmwahl auf den Rücksitzen einstellt.
3. Active hydraulic system according to claim 1 and 2, characterized in that
  • - The dynamic forces of the front and rear axles are measured and the artificially generated antiphase body vibration is controlled by a computer program in such a way that the point of complete vibration cancellation occurs in the front seats or in the case of a corresponding program selection in the rear seats.
DE19934301986 1993-01-26 1993-01-26 Active hydraulic system for road vehicle consisting of two hydraulic cylinders Withdrawn DE4301986A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE19934301986 DE4301986A1 (en) 1993-01-26 1993-01-26 Active hydraulic system for road vehicle consisting of two hydraulic cylinders

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19934301986 DE4301986A1 (en) 1993-01-26 1993-01-26 Active hydraulic system for road vehicle consisting of two hydraulic cylinders

Publications (1)

Publication Number Publication Date
DE4301986A1 true DE4301986A1 (en) 1994-07-28

Family

ID=6478896

Family Applications (1)

Application Number Title Priority Date Filing Date
DE19934301986 Withdrawn DE4301986A1 (en) 1993-01-26 1993-01-26 Active hydraulic system for road vehicle consisting of two hydraulic cylinders

Country Status (1)

Country Link
DE (1) DE4301986A1 (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2001034996A1 (en) * 1999-11-11 2001-05-17 Raytheon Company Vehicle suspension system
US6298791B1 (en) 1999-11-11 2001-10-09 Raytheon Company Lateral suspension assembly for a guided vehicle system
US6308636B1 (en) 1999-11-11 2001-10-30 Raytheon Company In-vehicle switch mechanism
US6418856B2 (en) 1999-11-11 2002-07-16 Raytheon Company Passive steering assembly for a guided vehicle

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1405857B (en) * Daimler Benz Ag, 7000 Stuttgart Shock absorber arrangement for vehicles, in particular for road vehicles
DE1257598B (en) * 1958-04-24 1967-12-28 Daimler Benz Ag Device for absorbing vibrations in the unsprung masses of motor vehicles
DE2856583A1 (en) * 1978-12-22 1980-06-26 Alfred Dipl Ing Ulrich Damped mounting for tractor hitch - has hydraulic angled damper to smooth vibrations and maintain wheel grip
DE4119414A1 (en) * 1991-06-13 1992-12-17 Bosch Gmbh Robert AGRICULTURAL USE OF TRACTOR WITH A LINKED LIFT
DE4241249A1 (en) * 1991-12-18 1993-06-24 Volkswagen Ag Motor vehicle suspension with skyhook active vibration dampers - suppresses wheel vibration by damping with linear relationship to three significant vertical velocities with constant coeffts.

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1405857B (en) * Daimler Benz Ag, 7000 Stuttgart Shock absorber arrangement for vehicles, in particular for road vehicles
DE1257598B (en) * 1958-04-24 1967-12-28 Daimler Benz Ag Device for absorbing vibrations in the unsprung masses of motor vehicles
DE2856583A1 (en) * 1978-12-22 1980-06-26 Alfred Dipl Ing Ulrich Damped mounting for tractor hitch - has hydraulic angled damper to smooth vibrations and maintain wheel grip
DE4119414A1 (en) * 1991-06-13 1992-12-17 Bosch Gmbh Robert AGRICULTURAL USE OF TRACTOR WITH A LINKED LIFT
DE4241249A1 (en) * 1991-12-18 1993-06-24 Volkswagen Ag Motor vehicle suspension with skyhook active vibration dampers - suppresses wheel vibration by damping with linear relationship to three significant vertical velocities with constant coeffts.

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2001034996A1 (en) * 1999-11-11 2001-05-17 Raytheon Company Vehicle suspension system
US6298791B1 (en) 1999-11-11 2001-10-09 Raytheon Company Lateral suspension assembly for a guided vehicle system
US6308636B1 (en) 1999-11-11 2001-10-30 Raytheon Company In-vehicle switch mechanism
US6418856B2 (en) 1999-11-11 2002-07-16 Raytheon Company Passive steering assembly for a guided vehicle
US6637561B1 (en) 1999-11-11 2003-10-28 Raytheon Company Vehicle suspension system

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Legal Events

Date Code Title Description
OM8 Search report available as to paragraph 43 lit. 1 sentence 1 patent law
8139 Disposal/non-payment of the annual fee