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    Golf Ecomatic

    Boas noites.

    Ora como todos sabemos, a VW no passado foi das primeiras a colocar no mercado (se tiver a dizer alguma asneira, alguém me corrija, por favor) uma versão com start-stop e automática, virada para os consumos, mais concretamente, o Lupo 1.2 tdi 3L (meados de 99/2000, por aí).



    O que muitos poderão não saber (eu desconhecia por completo), foi um modelo (descobri por acaso no youtube, quando às vezes me dá daquelas pancadas para ver videos de cold start ) em que fizeram um cold start, e que me intrigou pelo nome... Golf Ecomatic.

    Ora pesquisa puxa pesquisa, e após alguma recolha de informação, fiquei a saber que (pelo menos em Inglaterra), entre 1993 e 1994, a VW produziu uma versão antecessora do Lupo 1.2 Tdi, mais concretamente o Golf Ecomatic.



    Este Golf consistia nada mais do que um Golf com motor 1.9 D atmosférico, caixa manual de 5 velocidades semi-automática (sem pedal, com embraiagem accionada por um pistão accionado por vácuo, que opera a embraiagem, cada vez que se muda de velocidade), e que tem outras particularidades, nomeadamente a de a embraiagem ser accionada quando se levanta o pé do acelerador, ou seja, vai-se como se fosse em ponto morto. Mais, após 1,5 segundos de inactividade do acelerador, o próprio motor desliga-se (em andamento), e o carro segue em ponto morto desligado, até se carregar no acelerador novamente, além de fazer de start-stop nos semáforos e cruzamentos.

    O servo-freio dos travões trabalhava graças a um reservatório de váculo, bem como a embraiagem, que trabalhava graças a uma bomba de vácuo. Se o vácuo acabasse, o motor logava-se para "reabastecer" o reservatório.

    A direcção assitida era eléctrica, bem como uma bomba auxiliar de água (eléctrica) que fazia o líquido de refrigeração circular com o motor mesmo desligado. A bateria era de 92 Ah, e o alternado de 90 Ah. Existia ainda uma bateria auxiliar de 9 Ah. Tudo era controlado por uma unidade de controlo (quase que uma "avózinha" das actuais ECUS).

    Eis um filme do youtube que demonstra o funcionamento deste carro:

    YouTube - 1994 Volkswagen Golf Ecomatic review & test drive **faulty sound**

    Espero que apreciem tanto o conceito como eu, e já agora (joke mode on), com base neste modelo, o que é que gasta menos, carro em ponto morto ou desligado? (joke mode off)

    Segundo a VW no longínquo ano de 1994, o que menos gasta em combustível, é o uso dos dois conceitos ao mesmo tempo

    Para mais informação, fica aqui a citação em Inglês do site (The Golf Ecomatic Page) onde me informei sobre este raríssimo Golf, e que se a moderação permitir, aqui fica:

    "(...) The Volkswagen Golf Ecomatic, produced around 1993 - 1994. It was ahead of it's time, and as a result was a sales failure with only approximately 4000 vehicles made. Ironically, stop-starts are now coming back in fashion, yet a lot aren't as seamless as the Ecomatic was.
    So if you type "Golf Ecomatic" into Google, not a lot comes up, aside from part numbers from VAGCAT and foreign online parts systems. There also isn't a lot of information about what they are anywhere, so this site is an attempt to inform people a little of what the Golf Ecomatic is and how it worked. Because I own two of them and another Mk3, it is going to be a bit biased, so don't say you haven't been warned.
    The Ecomatic from chassis number 1h-rp-491791 can run on Rapeseed Methyl Ester (RME) (biodiesel) corresponding to DIN 51606 (EN 14214). Check your dealership for further information.

    The principle:
    The principle behind the Ecomatic was simple. As soon as you lift off the accelerator, the clutch opens and the car freewheels to let it glide under its own motional energy for as far as possible, the engine then switches off after a further 1.5 seconds of inactivity to save fuel required for tickover. When you then press the accelerator, the engine restarts right away, the clutch then closes (smoothly) and takes up drive and off you go. This was pretty clever for 1994!
    Aside from the fuel saved when the engine is off, the freewheeling enables you to travel quite far distances in overrun as opposed to if the engine braking effect was occurring, it takes a lot of getting used, to get the best out of the freewheeling effect, as well as learn to use the brake more as the car tends to "run away", but once you have mastered it, you can start doing many "free" miles.

    So how did it work?
    VW decided that the most appropriate engine for the design was the 1Y diesel engine, straight forward, non-turbo diesel engine. According to the brochure, this engine was used because it was an almost instantaneous starter, as well as having a good fuel economy from a diesel engine (of course). Naturally, the car wouldn't have had much point if it was a petrol variety which offered less fuel economy than the diesel models.
    All this freewheeling and engine switching off stuff couldn't be done with a conventional manual gearbox of course, so a manual gearbox with an automatic clutch was used (semi-automatic). A little odd as you would expect a fully automatic transmission, but there were no economy viable fully automatics around then.
    Modifications to the design to help pull this off involved a vacuum reservoir to provide a greater brake servo buffer, and a vacuum pump to provide vacuum to the clutch positioning valve (the vacuum system is actually quite clever, it works like this: it has a priority switching valve so that when the engine is running, the clutch vacuum is generated from the mechanical pump on the diesel engine for the brake servo, to take the wear off the vacuum pump motor, however when the engine is switched off, or when the door is opened, if the clutch vacuum is insufficient, the valve closes and the electric vacuum pump starts up to top up the clutch system, if the brake system runs out of vacuum reservoir, the engine is immediately restarted to top up the brake servo in a swift manner via the mechanical pump, the engine then provides vacuum for the brake system solely, and the electric vacuum pump has to provide vacuum to the clutch circuit, when the vacuum for the brake is restored, the valve then opens and things carry on as normal). In short, contrary to what some (including the brochure) say, the electric vacuum pump provides vacuum to the clutch system only. An electronic power steering pump to ensure steering is uninterrupted when the engine is off (there is no engine-driven pump), this pump switches on if the vehicle is moving, providing the ignition is on, an auxiliary coolant pump to keep hot water circulating round heater matrix (and engine) during switch off to ensure the blower continues to run without any heat drop-off on long periods of the engine switching off, this runs as long as the ignition is on. A larger battery to cope with long periods of switch off (92Ah), a more powerful than normal alternator (90 ampere), and an auxiliary battery (9Ah) to provide power to the lights (to ensure they do not dim), and other systems when the engine is being cranked, (and a control unit to manage the switching of batteries too).
    Along with various other sensors and control units to control all those devices, naturally.
    The heart of the system is the "digi-swing" (or DIGISWING) control unit (under the water deflector, where the ECU normally is) which manages a lot of these systems, the digi-swing controller masters the clutch operation via signals to the clutch positioner (with a fuzzy logic adaptation), switch off routine, outputs to the switches, control of the starter motor, and also has a pretty good self-diagnosis capability too. It suppresses the oil pressure and alternator warning lights when the engine is switched off. It even turns the engine on should the brake servo run out to top it up should you be going down a hill and exhaust the servo. And so it should!
    The instrument cluster also has 3 additional lights: An orange "Ecomatic control lamp" to show when the Ecomatic is disabled (via the switch on the wiper stalk), this prevents the Ecomatic from freewheeling and also stops the engine turning off, you can use this at busy junctions or when you need the engine brake. A second orange "Gear display control lamp" which comes on to tell you when you should change up, and flashes when you must change down (this even takes into account throttle position, therefore if your foot is flat down the light won't come on as soon as it knows you require the lower gear), generally, this light only flashes as a reminder you are in a way too high gear, not really as an indication when you could do with changing down. The light also flashes if a gear is not properly engaged. The third is a green "Engine running control lamp" which comes on to tell you when the engine is not yet in a state to be switched on and off (it is too cold, or the battery voltage is too low, or a fault has been detected, such as the brake servo vacuum pressure is too low). It should be noted that the green lamp goes off after 1 or so minutes into the journey, so you benefit from the stop-start pretty quickly.
    The Ecomatic can be disabled by pushing a button on the wiper stalk, in this mode, the car does not freewheel when the accelerator is released, and the engine does not switch off -- you can also restart the engine by pushing this switch at anytime. In this mode, because the clutch is not opened when the accelerator pedal is released, a switch inside the gear lever is used to determine when you are trying to change gear, when this switch is activated, providing the accelerator pedal is released, the clutch is opened, and you can change gear, the clutch is then opened until the switch is released AND the gear monitoring switch is reporting the gear is correctly engaged. Therefore, when the Ecomatic is switched off, you must grab the gear lever in the "correct" position and move simultaneously as you release the accelerator, otherwise the clutch will not be opened. Of course, in normal operation, you don't notice any of this, but this is the technical workings of it.
    Whether the Ecomatic is on or off, the clutch is of course automatically opened when you are going at a speed which would cause the engine to stall, as like a normal driver would use the clutch, for example, you could come to a stop in 3rd gear, and the clutch will open as you come to a stop, the gearchange indicator would flash, and the clutch would not close until either 1st or 2nd is selected (the digiswing unit is programmed to allow you to pull off from a stop in 1st or 2nd, the gearchange indicator lamp will flash in second as you do this to remind you that you are a berk however). In this manner, it is not possible to stall in an ecomatic.
    All 3 lamps flash at the same time for 10 seconds if a fault is detected with the system, at minute intervals, then the green light comes on permanently to stop the engine switching off, freewheeling behaviour remains on.
    Driving the ecomatic is fun, the freewheel allows you to coast for distances you never thought were possible, without using up *any* fuel, probably how the motor vehicle should have been designed in the first place. There is also a smug feeling you get from the car that the clutch is automatic, as well as the look from people when the engine starts and stops. As well as this, this car must have had hundreds of thousands of pounds invested in it, and for these reasons, you cannot help but love it.
    Radio loosing power and lights dimming on restart:
    If you car radio is loosing power when the engine is restarting, it is very likely you need to replace your auxiliary battery! The battery costs around £50 - £55 from the dealer, but an OEM equivalent will only set you back around £25!
    Characteristics:
    An initial start with the ignition key is required.
    The engine does not switch off until the coolant temperature has exceeded 40C, this usually takes 1-2 minutes. (Ecomatic mode is still on, as the car still freewheels).
    1st gear: Engine switches off if vehicle has been stopped and the accelerator pedal has not been operated within 5 seconds.
    2-5th gear: Engine switches off if accelerator has not been pressed for 1.5 seconds, any gear, any speed. Except if you have recently applied pressure to the gearlever (or changed gear) the control unit delays the engine turning off for an additional 5 seconds as it believes you are changing gear. If vehicle is stationary, engine will only restart by accelerator pedal if 1st gear is selected.
    Neutral: Engine switches off if gearlever switch has not been activated for 1.5 seconds; engine switches off regardless if you are pressing the accelerator.
    Reverse gear: Engine does not switch off, if engine is off and reverse is selected, engine immediately switches on.
    Driver's door is opened: Vacuum pump activates - if it appears to "run twice" a problem is present. Warning! If this is occurring there is danger the vacuum pump will burn out!
    Ignition on, engine off in Ecomatic mode with gear engaged, and the driver's door has been opened: Neutral must be briefly selected and 1st reselected before engine will restart. (...)"

    Um abraço
    Ricardo Paulo.

    Ps - se alguma coisa não estiver bem, a moderação que corrija, por favor. Obrigado.
    Editado pela última vez por rbpaulo; 28 January 2011, 00:29.

    #2
    Recordo-me de na altura ter lido sobre o mesmo.

    Cá não sei se a versão Ecomatic chegou a ser vendida, mas chegou a ser vendido em outros países para além da Inglatera.

    Comentário


      #3
      O primeiro modelo que a VW colocou na estrada com esse sistema star&stop até acho que foi um Jetta, com esse motor 1.9D .

      Comentário


        #4
        Awesome. Por acaso gostava de saber como resistiu o motor ao final dessas brincadeiras todas. É que para mim, o Start-Stop não me convence em termos de durabilidade No entanto, e se tudo correr nos conformes, o meu próximo veículo já irá trazer esta tecnologia. Se é boa a curto prazo para poupar no consumo, deverá ser péssima para a longevidade do motor e do respectivo motor de arranque e bateria

        Comentário


          #5
          Originalmente Colocado por rbpaulo Ver Post
          Boas noites.


          Ora pesquisa puxa pesquisa, e após alguma recolha de informação, fiquei a saber que (pelo menos em Inglaterra), entre 1993 e 1994, a VW produziu uma versão antecessora do Lupo 1.2 Tdi, mais concretamente o Golf Ecomatic.



          Este Golf consistia nada mais do que um Golf com motor 1.9 D atmosférico, caixa manual de 5 velocidades semi-automática (sem pedal, com embraiagem accionada por um pistão accionado por vácuo, que opera a embraiagem, cada vez que se muda de velocidade), e que tem outras particularidades, nomeadamente a de a embraiagem ser accionada quando se levanta o pé do acelerador, ou seja, vai-se como se fosse em ponto morto. Mais, após 1,5 segundos de inactividade do acelerador, o próprio motor desliga-se (em andamento), e o carro segue em ponto morto desligado, até se carregar no acelerador novamente, além de fazer de start-stop nos semáforos e cruzamentos.
          Realmente desconhecia que a VW tivesse tido esse sistema ....mas recordo-me que há bastantes anos atras,também havia um Twingo (dos primeiros) comercializado cá em portugal que tinha caixa manual e sem embraiagem), não sei se o sistema de funcionamento era o mesmo ...ou qual dos dois apareceu primeiro.

          Quanto a se desligar o motor em andamento , acho um pouco ridículo ... debilita a segurança ... o motor não vai a segurar o carro, provoca desgaste prematuro de travões, além de que um carro com motor a trabalhar, engatado e indo em andamento, sem ser acelerado já vai a gastar 0, não se ganha nada em desliga-lo.
          Editado pela última vez por Dave; 28 January 2011, 14:34.

          Comentário


            #6
            Muito boa leitura

            Já agora o que é radio LOOsing power?

            Comentário


              #7
              Boas! E em relação aos consumos, como era? (Li na diagonal o texto principal, mas não vi nada referente aos mesmos..)
              Cumpts

              Comentário


                #8
                Originalmente Colocado por MaximusDecimus Ver Post
                Boas! E em relação aos consumos, como era? (Li na diagonal o texto principal, mas não vi nada referente aos mesmos..)
                Cumpts
                Boas !

                Pelo que vi, o consumo andava pelos 4,5 e os 5 litros. Os carros de hoje conseguem melhor, mesmo sem start-stop, mas para a época, eram muito bons consumos.

                Abraço

                Ricardo Paulo

                Comentário


                  #9
                  Originalmente Colocado por rbpaulo Ver Post
                  Boas !

                  Pelo que vi, o consumo andava pelos 4,5 e os 5 litros. Os carros de hoje conseguem melhor, mesmo sem start-stop, mas para a época, eram muito bons consumos.

                  Abraço

                  Ricardo Paulo

                  Acredita que mesmo em carros recentes é dificil fazer essas médias... Tem de se pastar muito

                  Comentário


                    #10
                    Originalmente Colocado por Pv123 Ver Post
                    Muito boa leitura

                    Já agora o que é radio LOOsing power?
                    Haha, isso é porque quando eu fiz o meu site eu não executar o corretor ortográfico.

                    Eu corrigido esse erro, e eu vou lhe dar uma melhor explination também :-)

                    O Ecomatic está equipado com duas baterias

                    Principais bateria (92Ah)
                    Bateria de backup (9Ah)

                    Como a maioria dos carros, o motor de arranque chama muito a energia da bateria. Um empate faria com que o rádio perder o poder em todos os carros tempo. Ao contrário de outros carros, o motor de arranque é utilizado muitas vezes durante a viagem. É inaceitável que o rádio é desligado.

                    Com a ajuda de uma pequena unidade de controlo é chamado quando o circuito de arranque de comutação de relé (luzes do painel do rádio) 9Ah bateria. Portanto, há queda de tensão no rádio que continua a trabalhar sem interrupções. Isso evita também as luzes de escurecimento.

                    Como o motor tem menos de um segundo para reiniciar, é mais do que 9Ah suficiente para executar uma luzes do painel do rádio há menos de um segundo :-)

                    Se a bateria auxiliar está com defeito e antigos, quando o rádio é usado, não há energia fornecida para o painel de rádio, etc

                    Aqui está o vídeo do meu carro começar :-) frio: YouTube - Golf Mk3 Ecomatic 1Y Diesel Cold Start (-9°C)

                    Comentário

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