The Mercedes-Benz 5-Speed Automatic Transmission Targets and Comparison of Concepts 901759

Since the introduction of the 4-speed automatic transmissions W4A040 in 1979 and W4A020 in 1981, more than 50% of Mercedes-Benz cars have been equipped with automatic transmissions. These transmissions have undergone continuous development since their introduction. Due to engine/transmission management, the kick-down shift points are electronically influenced, the shift comfort is improved partially by ignition timing manipulation. During the warm-up phase the shift points are raised via output signals from the electronic engine system to improve exhaust gas emissions. In this paper considerations are explained which resulted in supplementing the proven four-speed transmission with a five-speed transmission.


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