Mitsubishi Motors Corporation (MMC) has developed a twin clutch Sport Shift Transmission (SST) for the new Lancer Evolution, due to be launched this fall. The new automated six-speed manual transmission can help improve fuel economy by up to 15% over existing five-speed automatic gearboxes, according to the company.
MMC also is introducing an advanced vehicle dynamics control system—S-AWC (Super All Wheel Control)—for the Lancer that regulates drive torque at each wheel.
The new automated manual transmission employs dual clutches to realize power transmission efficiencies on a par with a normal manual gearbox while also allowing slick and swift shifting while returning lower fuel consumption due to its high-efficiency power transmission mechanism.
Twin Clutch SST puts odd (1st, 3rd, 5th) and even (2nd, 4th and 6th) gears on separate input shafts, each connected to an individual clutch. With both clutches under precise system control, this arrangement allows fast, smooth and lag-free gear changes with no interruption in power delivery. Using clutches instead of a torque converter to transmit power makes the Twin Clutch SST simpler in structure and reduces power transmission losses for higher transmission efficiency that leads to improved fuel economy.
Twin Clutch SST allows the driver to switch between three shifting programs—Normal, Sport and S-Sport—to cover the full range of driving situations, from town use to sporty motoring on open roads.
For use around town and other normal driving situations, Normal mode scheduling uses relatively low-speed shift points to deliver unobtrusive shifting for maximum comfort together with optimum fuel economy.
For use when driving in the mountains or when engine braking is required, Sport mode scheduling uses higher shift points and quicker shifting to deliver instant throttle response that instills in the driver a closer man/machine relationship.
Compared with Sport mode, S-Sport mode scheduling keeps the engine turning at higher revs while allowing lightening-fast shifting.
S-AWC. The S-AWC system adds an ASC (Active Stability Control) feature to the ACD (Active Center Differential), AYC (Active Yaw Control) and Sport ABS (Sport Antilock Brake System) components that have proven themselves in the Lancer Evolution series. Integrated system management of these four components allows regulation of torque and braking force at each wheel.
The S-AWC vehicle dynamics control system integrates management of all its AYC, ACD, ASC and Sport ABS components (see below) while adding braking force control to Mitsubishi Motors’ own AYC system. As a result S-AWC elevates drive power, cornering performance as well as vehicle stability under all driving situations, from everyday motoring to emergency evasion maneuvers.
S-AWC also now employs yaw rate feedback control. This allows the system to control each wheel under a wide range of driving conditions.