Leon Mk1
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Information on "Four-wheel drive automatic gearbox 099"
Information on "Four-wheel drive automatic gearbox 099"
Comprehensive information on 4-speed automatic gearboxes is given in self study programme No. 172. Comprehensive information on syncro vehicles is given in self study programme No. 78. Torque converter The torque converter is equipped with a lock-up clutch. The lock-up clutch is closed dependent on load and speed and drives 1st, 2nd, 3rd and 4th gears mechanically independent of slip. Gearbox The 4-speed automatic gearbox 099 with four-wheel drive is equipped with 4 hydraulically activated forward gears. When the lock-up clutch is closed these forward gears become mechanically driven gears by eliminating the torque converter slip. Front final drive The front final drive transfers the drive from the gearbox direct to the front wheels. The propshaft is driven via the bevel gears. Propshaft The propshaft transfers the drive via a slip dependent viscous coupling to the rear axle. Rear final drive The rear final drive transfers the drive to the rear wheels. This final drive is a composite unit and consists of: viscous coupling, bevel gear and final drive with freewheel. Self-diagnosis The self-diagnosis is described in booklet "Alhambra1996 ▸, self-diagnosis for automatic gearbox 099 four-wheel drive". Control unit -J217- with driving situation gear changes (Fuzzy Logic) Determining the driving situation and driving resistance dependent gear change point happens automatically. Advantages:
Gear change point variations for gradients An additional gear change map automatically selects gear changes for gradients dependent upon accelerator pedal position and driving speed.
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