The Audi A4 Cabriolet Design And Operation - VolksPage

Convertible topClosing convertible topPrerequisites:– Vehicle stationary / speed 5 km/h– Ignition on– Boot lid closedPress and hold down convertible top switchin centre console.If switch is released, movement ceasesinstantly (freezes) and all convertible topelements remain in their current position.278 012From this position, the convertible top can bemoved again in any direction by renewedactuation of the switch.The stop mode is terminated after 10 minutesand the convertible top then folds down fromits current position.The convertible top is not fully closed untilthe warning lamp in the dash panel inserthas gone out.278 011Convertible top closing phases:All the above-mentioned prerequisites mustbe fulfilled.Actuation of the switch locks the boot lid andat the same time activates the warning lampin the dash panel insert.All the side windows are then lowered to adefined position. Once the windows havebeen lowered, the convertible topcompartment lid is released and fully raised.18278 021

The convertible top is swivelled forwards outof its compartment and at the same time thelock at the front end of the convertible topopens.278 022The convertible top frame is completelyraised. The compartment lid is then closedagain and fully latched. The boot lid is thenreleased.278 023The convertible top is swivelled towards theroof frame with the open lock facingforwards.278 024The convertible top frame is lowered onto thecompartment lid and at the same time thefront end of the convertible top comes to reston the roof frame. Once the convertible top isin position, the lock is actuated and the frontend latched again.278 025Once the convertible top is closed, the heatedrear window is reactivated and the warninglamp in the dash panel insert goes out.Continuing to press the convertible topswitch then causes the side windows toreturn to fully raised position.278 02619

Convertible topVariable convertible top compartmentThe open convertible top is completely foldedaway in its variable compartment.When the convertible top is closed, thiscompartment can be raised to increase thesize of the luggage compartment.The variable compartment must have beenfully lowered before the convertible top canbe opened.The variable compartment cannot be raisedwith the convertible top open.Variable convertible top compartmentloweredOperating lever in position AVariable convertible top compartment raisedOperating lever in position B278 028A message appears on the dash panelinsert display if an attempt is made toopen the convertible top without havinglowerered the variable compartment.Lowercompartment tray278 02720

Convenience opening and closing of automaticconvertible topThe automatic convertible top can also beopened or closed by inserting the vehicle keyin the driver's door lock.Opening and closing are interruptedimmediately on releasing the key.For safety reasons, actuation of the automaticconvertible top by way of the key remotecontrol function is not possible.Convenience opening:– Turn key once into opening position (1).– Within two seconds, turn key a secondtime into opening position (2) and hold keyin this position until convertible top is fullyopen.278 031If vehicles are fitted with an anti-theftalarm, release button on key has to bepressed first to unlock the vehicle.278 029Convenience closing:– Turn key once into closing position (1).– Within two seconds, turn key a secondtime into closing position (2) and hold keyin this position until convertible top is fullyclosed.278 03021

Convertible topEmergency actuationIn the event of a malfunction, the automaticconvertible top can also be closed manually.Such manual closing should however only beemployed in emergency situations.The following prerequisites have to befulfilled to permit emergency actuation of theautomatic convertible top:– Vehicle stationary - handbrake applied– Windows open– Ignition key removedFull emergency actuation of the automaticconvertible top essentially comprises thefollowing steps:––––Release of compartment lidRaising of convertible topLocking of compartment lidLatching of convertible topThe boot lid must be closed when theconvertible top compartment lid isreleased so as not to damage eithercomponent.Emergency release keyEmergency closing of the convertible toprequires the use of an emergency release key.This is located behind the fuse box cover in aseparate compartment.The emergency release key has the followingfunctions:– Locking and release of convertible topcompartment lid– Latching and release of convertible top inwindscreen frame278 04122

Releasing convertible top compartment lidThe first step is to move the emergencyrelease key into its operating position.This involves turning the red handle anticlockwise as far as it will go.278 051The release system for the convertible topcompartment lid is located behind the centresection of the rear seat backrest.For release purposes, this section has to beremoved and the emergency release keyinserted in the opening provided. The guidelugs must be felt to engage in the slots.Then give the whole emergency release key aquarter of a clockwise turn to fix it inpreliminary position.278 04223

Convertible topTurn red handle of emergency release keyclockwise until it is heard to engage. Thenturn whole emergency release key anticlockwise as far as it will go and leave it inthis position. This causes the convertibletop compartment lid to be released andlifted out of its locks.If stiff, the force required for release can bereduced by pressing on the convertible topcompartment lid.Raise the convertible top compartment lidmanually as far as its end stop, taking carenot to grasp hold of the covers for therollover bars. The lid will remainunsupported in this position.278 043If the convertible top compartmentlid is not raised as far as it will go onboth sides it could drop down again,causing damage to the vehicle orinjury to people in the vicinity.Raising convertible topLift convertible top out of convertible top trayand raise it.278 04824

Closing convertible top compartmentRaise convertible top frame until it is vertical.The frame will remain unsupported in this position.Then close convertible top compartment lid again until it is resting on locks.At this point the convertible top compartment lid cannot yet be completely closed - a gapremains between the lid and the body.Locking convertible top compartment lidTurn the whole emergency release keyclockwise as far as it will go.This automatically lowers and locks theconvertible top compartment lid.278 044Removing emergency release keyTurn the red handle of the emergency releasekey anti-clockwise as far as it will go.Then turn the whole emergency release keyanti-clockwise and pull it out downwards,thus locking the convertible top compartmentlid.278 04925

Convertible topClosing and latching convertible topPosition front bracing hoop on roof frame.The emergency release key must be movedinto its operating position beforehand.This involves turning the red handle anticlockwise as far as it will go.278 051The opening for the roof frame releasesystem is located in the centre of theconvertible top behind a small trim cap,which has to be removed first.The vehicle key can be used for this purpose.For latching purposes, the emergency releasekey is to be inserted in the opening such thatthe guide lugs are felt to engage in the slotsprovided.Then give the whole emergency release key aquarter of a clockwise turn. This fixes theemergency release key in its preliminaryposition and stops it dropping out of the locksystem.278 04526

Turn red handle of emergency release keyclockwise until it is heard to engage.Turn the whole emergency release keyclockwise as far as it will go.This opens the convertible top locks and theconvertible top is raised slightly.278 047Use the emergency release key to pull the convertible top downwards and turn the key anticlockwise as far as it will go to latch the convertible top in position.278 05227

Convertible topRemoving emergency release keyTurn the red handle of the emergency releasekey anti-clockwise as far as it will go.Then turn the whole emergency release keyanti-clockwise and pull it out downwards,thus latching the convertible top.278 046It is also possible to open the convertible top using the emergency actuation function.This is to be performed in the reverse order of the procedure described above.28

Notes29

Convertible topHydraulic systemMaster cylinder278 07930

Convertible top framecylinderHydraulic pumpConvertible top compartment lidcylinder278 09531

Convertible topHydraulic pumpThe hydraulic pump is a rotor-type reciprocating pump which can operate in both directionsdepending on actuation.3/2-way solenoid valveElectric motorSwitching relayHydraulic pump278 07632

The rotor-type reciprocating pump draws inhydraulic fluid from the reservoir by way ofthe hole L.The centrifugal force of the pistons causesthe cylinders to be charged. The rotor turnstogether with the pistons about an eccentricstator. The pistons are thus forced inwardsagain and the hydraulic fluid conveyed intothe valve block at a pressure of max. 130 barvia the hole R.Switching of the solenoid valves appliespressure to the hydraulic cylinders.Changing the direction of rotation of theelectric motor reverses the pump process.Valve housing3/2-way solenoid valveRestrictorPump rNon-return valvePressure limiting valveHydraulic fluidreservoirIntake shuttle valve278 07533

Convertible topHydraulic cylindersUse is made in the Audi A4 Cabriolet of double-acting hydraulic cylinders, which can beactuated from both sides and act in two different directions to suit the situation concerned.Hydraulic cylinderHydraulic pipe connectionSealing ringClipNoncompressionstageCompressionstagePiston rodPiston crown278 07334

3/2-way solenoid valve NV 090The flow of current through the solenoidvalve coil causes the moving steel core toclose the upper ball valve. At the same time,the lower ball valve is opened by way of apush rod. The hydraulic fluid can then flowvia the outlet into the hydraulic cylinders.Releasing the switch brings the movement ofthe convertible top to an instant halt.The non-return valve enables the convertibletop to remain in its current position (onrelease of convertible top switch orinterruption of key-operated convenienceopening/closing).This "freezing" phase lasts for 10 minutesprovided that the solenoid valve is electricallyactuated.After this period or if the ignition is switchedoff, depressurisation takes place and mayresult in uncontrolled system collapse.With ignition off, all valves in the hydrauliccontrol unit are opened and the convertibletop can be operated manually.Shuttle valve:Moving steel coreCoilUpper ball valveInletLower ball valveOutletNon-return valvePump278 07435

Convertible topHydraulic "opening" functionsRaising convertible top framePrerequisites:Conv. top frame cyl.Conv. top frame cyl.Master cylinderMaster cylinderConvert. top compartm. lid cyl.Convert. top compartm. lid cyl.– Direction of pump rotation: Clockwise– Solenoid valve F2 energised– Solenoid valve F3 energisedF1S1W1F2F3Pump pressureAnticlockw.Clockw.Return pressureDepressurisedW2Pressure limitingvalve D1Solenoid valve energised ThroughflowSolenoid valve deenergised Return open36Pressure limitingvalve D2278 080

Convertible top compartment lid cylindersPressure is applied to the non-compression stages of the convertible top compartment lidcylinders by way of the energised solenoid valve F2 and the lid remains in closed position.Master cylindersSolenoid valves F2 and F3 are energised.As a result, pressure is applied to both the compression and non-compression stages of themaster cylinders.The pressure is distributed evenly over the cylinder non-compression and compression stage.As the piston surface area of the compression stage is larger than that of the non-compressionstage, different forces can be generated under the same pressure conditions. The force thusacts on the compression stage, with the result that the cylinder is extended as far as its endstop and stays in this position. The convertible top remains tilted forwards.Convertible top frame cylindersThe non-compression stages of the two frame cylinders are actuated by the switched solenoidvalve F3 and raise the convertible top frame.As it is actuated simultaneously from both sides, the shuttle valve W1 opens in the direction ofthe frame cylinder non-compression stages, with the connection to the cylinder compressionstages being blocked by a one-direction non-return valve.This causes the frame cylinders to be retracted and the convertible top frame to be raised.Hydraulic fluid displaced from the compression stages is routed into the reservoir.37

Convertible topHydraulic "opening" functionsOpening convertible top compartment lidPrerequisites:Conv. top frame cyl.Master cylinderMaster cylinderConvert. top compartm. lid cyl.Conv. top frame cyl.Direction of pump rotation: ClockwiseSolenoid valve F1 energisedSolenoid valve F2 energisedSolenoid valve F3 energisedConvert. top compartm. lid cyl.––––F1W1F2S1F3Pump pressureAnticlockw.Clockw.Return pressureDepressurisedW2Pressure limitingvalve D1Pressure limitingvalve D2278 08138

Convertible top compartment lid cylindersPressure is simultaneously applied from both sides by way of the energised solenoid valves F1and F2 to the convertible top compartment lid cylinders, which are thus extended.This is due to the larger piston surface areas in the compression stage and the consequentdifference in forces arising on applying the same level of pressure.The compartment lid is raised.Master cylindersSolenoid valves F2 and F3 are energised.As a result, pressure is applied to both the compression and non-compression stages of themaster cylinders.Convertible top frame cylindersPressure is simultaneously applied from both sides via the energised solenoid valves F2 and F3to the shuttle valve W1, thus causing it to open and hydraulic pressure to be routed to the noncompression stages of the convertible top frame cylinders.As a result, the frame cylinders remain retracted and the convertible top frame is held in raisedposition.39

Convertible topHydraulic "opening" functionsLowering convertible top framePrerequisites:Conv. top frame cyl.Conv. top frame cyl.Master cylinderMaster cylinderConvert. top compartm. lid cyl.Convert. top compartm. lid cyl.– Direction of pump rotation: Anti-clockwise– Solenoid valve F1 energised– Solenoid valve F3 energisedF1W1F2S1F3Pump pressureAnticlockw.Clockw.Return pressureDepressurisedW2Pressure limitingvalve D1Pressure limitingvalve D2278 08240

Convertible top compartment lid cylindersThe lid cylinders are not actuated.Energisation of the solenoid valve F1 causes the integrated non-return valve to be operated.This prevents depressurisation of the cylinders in the compression stage and the convertibletop compartment lid is closed.Master cylindersHydraulic pressure is routed by way of the non-return valve S1 directly to the compressionstages of the master cylinders.These remain extended and hold the convertible top in forward position.On account of the shuttle valve W1 and the energised solenoid valve F3, the hydraulic pressurecannot escape into the system.Convertible top frame cylindersPressure is applied directly to both cylinders via the compression stage.The cylinders are extended and the frame stowed in the convertible top compartment.Hydraulic fluid displaced from the non-compression stage is routed into the system and fedinto the reservoir via F2.41

Convertible topHydraulic "opening" functionsStowing convertible topPrerequisites:Conv. top frame cyl.Conv. top frame cyl.Master cylinderMaster cylinderConvert. top compartm. lid cyl.Convert. top compartm. lid cyl.– Direction of pump rotation: Clockwise– Solenoid valve F1 energised– Solenoid valve F2 energisedF1W1F2S1F3Pump pressureAnticlockw.Clockw.Return pressureDepressurisedW2Pressure limitingvalve D1Pressure limitingvalve D2278 08342

Convertible top compartment lid cylindersPressure is simultaneously applied from both sides by way of the energised solenoid valves F1and F2 to the convertible top compartment lid cylinders.The cylinders remain extended and the compartment lid is held in raised position.Master cylindersHydraulic pressure is routed by way of the solenoid valve F2 directly to the non-compressionstages of the master cylinders.These are retracted and the convertible top is stowed in its compartment.The hydraulic fluid displaced from the compression stage is routed via F3 into the reservoir.Convertible top frame cylindersNeither frame cylinder is actuated.Both frame cylinders are partially retracted by the convertible top mechanism.43

Convertible topHydraulic "opening" functionsClosing convertible top compartment lidPrerequisites:Conv. top frame cyl.Conv. top frame cyl.Master cylinderMaster cylinderConvert. top compartm. lid cyl.Convert. top compartm. lid cyl.– Direction of pump rotation: Clockwise– Solenoid valve F2 energisedF1W1F2S1F3Pump pressureAnticlockw.Clockw.Return pressureDepressurisedW2Pressure limitingvalve D1Pressure limitingvalve D2278 08444

Convertible top compartment lid cylindersPressure is applied by way of the energised solenoid valve F2 to the non-compression stagesof the lid cylinders.These are retracted and the compartment lid thus closed.The hydraulic fluid draining out of the compression stage is routed via F1 into the reservoir.Master cylindersHydraulic pressure is routed by way of the solenoid valve F2 directly to the non-compressionstages of the master cylinders.These thus remain retracted and the convertible top is left in its compartment.Convertible top frame cylindersThe frame cylinders are not actuated.They remain partially retracted.45

Convertible topHydraulic "closing" functionsRaising convertible top compartment lidPrerequisites:Conv. top frame cyl.Conv. top frame cyl.Master cylinderMaster cylinderConvert. top compartm. lid cyl.Convert. top compartm. lid cyl.– Direction of pump rotation: Clockwise– Solenoid valve F1 energised– Solenoid valve F2 energisedF1W1F2S1F3Pump pressureAnticlockw.Clockw.Return pressureDepressurisedW2Pressure limitingvalve D1Pressure limitingvalve D2278 08546

Convertible top compartment lid cylindersPressure is simultaneously applied from both sides by way of the energised solenoid valves F1and F2 to the converti

Convertible top Roof guide element 1 Convertible top design Even at first glance it becomes apparent that the convertible top is designed to fulfill the most exacting demands of everyday driving and winter conditions. The convertible top fabric is made of particularly easy-care material and does not have to be treated with impregnating agent