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Automatic Performance Control (APC) was the first engine knock and boost control system. The APC was invented by Per Gillbrand at the Swedish car maker SAAB. U.S. Patent 4,372,119 SAAB introduced it on the turbo charged Saab H engines in 1982, and the APC was fitted to all subsequent 900 Turbos through 1993 (and 1994 convertibles), as well as 9000 Turbos through 1989.The APC was sold to Maserati to equip the carbureted Maserati Biturbo, with different settings for the Biturbo, and was known as the Maserati Automatic Boost Controller (MABC).

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  • Automatic Performance Control (APC) was the first engine knock and boost control system. The APC was invented by Per Gillbrand at the Swedish car maker SAAB. U.S. Patent 4,372,119 SAAB introduced it on the turbo charged Saab H engines in 1982, and the APC was fitted to all subsequent 900 Turbos through 1993 (and 1994 convertibles), as well as 9000 Turbos through 1989.The APC was sold to Maserati to equip the carbureted Maserati Biturbo, with different settings for the Biturbo, and was known as the Maserati Automatic Boost Controller (MABC). The APC allowed a higher compression ratio (initially, 8.5:1 as opposed to 7.2:1, and, on 16-valve variants introduced in 1985, 9.0:1). This improved fuel economy and allowed the use of low-octane petrol without causing engine damage caused by knock. The APC controls boost pressure and the overall performance, specifically the rate of rise and maximum boost level - and it detects and manages harmful knock events. To control the turbocharger, the APC monitors the engine's RPM and inlet manifold pressure via a pressure transducer, and uses these inputs to control a solenoid valve that trims the rate of rise of pressure as well as the maximum pressure by directing boost pressure to the turbocharger's pneumatic wastegate actuator. To detect knock, a piezoelectric knock sensor (basically a microphone) bolted to the engine block responds to unique frequencies caused by engine knock. The sensor generates a small voltage that is sent to the electronic control unit, which processes the signal to determine if, in fact, knock is occurring. If it is, then the control unit activates a solenoid valve that directs boost pressure to the turbocharger's pneumatically controlled wastegate, that opens to bypass exhaust gases from the turbocharger directly to the exhaust pipe, lowering turbo boost pressure until the knock subsides. Knock events that are managed by the APC can be discerned when the in-dash boost needle "twitches" slightly. The APC unit has a 'knock' output where an LED may be connected. This LED will then light up if knock is detected. Because the knock sensor becomes less accurate at high revolutions, the APC tapers maximum boost pressure after approximately 4,500 RPM. (en)
  • APC System, sigla di Automatic Performance Control, è un sistema elettronico di gestione della pressione di sovralimentazione applicato a motori a ciclo otto sovralimentati mediante turbocompressore. Presentato per la prima volta nel 1982 dalla casa automobilistica svedese Saab ed utilizzato sulla 900 turbo. Il propulsore della 900 turbo, anno 1983, è un quattro cilindri in linea di 1985 cm³ a due valvole per cilindro con un albero a camme in testa e valvole allineate (le valvole di scarico sono raffreddate al sodio); ha pistoni forgiati ed alesaggio e corsa di 90 mm x 78 mm; il rapporto di compressione è di 8,5:1 contro i 7,2:1 della versione senza APC; è sovralimentato mediante un turbocompressore Garrett Systems T3 azionato dai gas di scarico; eroga una potenza di 145 cv (107 kw) a 5000 giri/min. sviluppando una coppia di 24 kgm (235 N·m) a 3000 giri/min. (it)
  • Automatic Performance Control (APC) was in 1982 het eerste pingel- en turbodrukcontrolesysteem voor Saab turbomotoren welke vervolgens in alle Saab 900 (tot 1994) en Saab 9000 is ingebouwd. Met APC werd een hogere compressieverhouding mogelijk, aanvankelijk 8,5:1 in tegenstelling tot 7,2:1 en 9,0:1 in motoren met 16 kleppen. Dit verbeterde het brandstofverbruik en maakte het mogelijk ook 95 octaan benzine te gebruiken zonder motorschade te veroorzaken door pingelen.De APC doet twee dingen: 1. * regelen van de turbodruk, met name het oplopen en de maximum druk 2. * signaleren van pingelen Om de turbolader te regelen, monitort de APC het toerental van de motor en de druk in het inlaatspruitstuk en gebruikt deze signalen om een klep meer of minder te openen en daarmee het stijgen en de maximim turbodruk te regelen. Om pingelen te signaleren is er een piëzo-elektrische pingelsensor, een soort microfoon, op het motorblok aangebracht welke de specifieke geluidstrillingen van pingelen omzet naar een elektrisch signaal voor de electronic control unit van de APC. Als de ECU pingelen detecteert, wordt via een spoel de wastegate van de turbolader geopend waardoor de turbodruk wegvalt. Ook kan de APC de brandstofinjectie zodanig regelen dat er minder of geen brandstof meer wordt ingespoten. De elektronische APC regelunit heeft een pingeluitgang waarop een LED aangesloten kan worden zodat op het dashboard een waarschuwing zichtbaar wordt. (nl)
  • Automatic Performance Control (APC) eller APC-systemet, Saabs system för att hantera variationer i bensinkvalitén, lanserat 1980. APC utvecklades av Per Gillbrand på Saab dels för att få bukt med motorskador på turbomotorerna orsakade av dålig bränslekvalitet, dels för att få turbomotorerna mer bränslesnåla. (sv)
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  • Automatic Performance Control (APC) eller APC-systemet, Saabs system för att hantera variationer i bensinkvalitén, lanserat 1980. APC utvecklades av Per Gillbrand på Saab dels för att få bukt med motorskador på turbomotorerna orsakade av dålig bränslekvalitet, dels för att få turbomotorerna mer bränslesnåla. (sv)
  • Automatic Performance Control (APC) was the first engine knock and boost control system. The APC was invented by Per Gillbrand at the Swedish car maker SAAB. U.S. Patent 4,372,119 SAAB introduced it on the turbo charged Saab H engines in 1982, and the APC was fitted to all subsequent 900 Turbos through 1993 (and 1994 convertibles), as well as 9000 Turbos through 1989.The APC was sold to Maserati to equip the carbureted Maserati Biturbo, with different settings for the Biturbo, and was known as the Maserati Automatic Boost Controller (MABC). (en)
  • APC System, sigla di Automatic Performance Control, è un sistema elettronico di gestione della pressione di sovralimentazione applicato a motori a ciclo otto sovralimentati mediante turbocompressore. Presentato per la prima volta nel 1982 dalla casa automobilistica svedese Saab ed utilizzato sulla 900 turbo. (it)
  • Automatic Performance Control (APC) was in 1982 het eerste pingel- en turbodrukcontrolesysteem voor Saab turbomotoren welke vervolgens in alle Saab 900 (tot 1994) en Saab 9000 is ingebouwd. Met APC werd een hogere compressieverhouding mogelijk, aanvankelijk 8,5:1 in tegenstelling tot 7,2:1 en 9,0:1 in motoren met 16 kleppen. Dit verbeterde het brandstofverbruik en maakte het mogelijk ook 95 octaan benzine te gebruiken zonder motorschade te veroorzaken door pingelen.De APC doet twee dingen: 1. * regelen van de turbodruk, met name het oplopen en de maximum druk 2. * signaleren van pingelen (nl)
rdfs:label
  • Automatic Performance Control (en)
  • Saab APC System (it)
  • Automatic Performance Control (nl)
  • Automatic Performance Control (sv)
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