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To be featured in the new Mitsubishi Lancer Evolution X
S-AWC dynamics control system with Twin Clutch SST

Mitsubishi Prototype X, the precursor of the 2008 Lancer Evolution X.

Mitsubishi Prototype X announced the 2008 Lancer Evolution X.

13 July 2007.

Mitsubishi Motors Corporation announced last Tuesday that it developed two new component systems that are expected to feature in the new Lancer Evolution (X), due to be launched this autumn.

The first new component system is the Super All Wheel Control (S-AWC), an advanced vehicle dynamics control system that regulates drive torque at each wheel.

Mitsubishi ACD, Active Center Differential for the new 2008 Lancer Evolution X.

Active Center Differential (ACD) incorporates an electronically-controlled hydraulic multi-plate clutch to optimize front/rear wheel torque split and provide the best balance between traction and steering response.

The second one is the Twin Clutch SST (Sport Shift Transmission), which is an automated manual transmission designed to deliver slicker shifting through the gears while freeing the driver from the need to operate the clutch.

Mitsubishi claims that Twin Clutch SST and S-AWC help making driving more intuitive. Both systems work to efficiently distribute power appropriate to road conditions, and deliver better control with stability maintained by an "intelligent" system that "reads" and reflects driver intent in real time.

Mitsubishi AYC, Active Yaw Control for the 2008 Lancer Evo X.

Active Yaw Control (AYC) uses a torque transfer mechanism in the rear differential to control rear wheel torque differential for different driving conditions. It also acts like a limited slip differential by suppressing rear wheel slip to improve traction.

The S-AWC system adds an ASC (Active Stability Control) feature to the ACD (Active Center Differential), AYC (Active Yaw Control, see photo) and Sport ABS (Sport Antilock Brake System) components that have proven themselves in the Lancer Evolution series (see yellow box).

The integrated system management of these four components regulates torque and braking force at each wheel. S-AWC also now employs yaw rate feedback control. This allows the system to control each wheel under a wide range of driving conditions, thus realizing vehicle behavior that reflects driver inputs and allows drivers of all abilities to enjoy sporty motoring with confidence.

Mitsubishi Super All Wheel Control (S-AWC), an advanced vehicle dynamics control system that regulates drive torque at each wheel.

S-AWC (mounted on current Lancer Evolution IX): vehicle dynamics control system to regulate drive torque at each wheel.

Twin Clutch SST - MMC's 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.

Allowing drivers of all abilities to shift rapidly up and down through the gears, Twin Clutch SST delivers sporty acceleration while also returning superior fuel mileage thanks to its high-efficiency power transmission mechanism. The new transmission also features three operating modes tailored to different situations: from around-town drivability to instant-response and follow-the-line sporty motoring on the open road.

S-AWC: How it works? 

The vehicle dynamics control system integrates management of all its AYC, ACD, ASC and Sport ABS components 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.

The Active Center Differential ( ACD) incorporates an electronically-controlled hydraulic multi-plate clutch. The system optimizes clutch cover clamp load for different driving conditions, regulating the differential limiting action between free and locked states to optimize front/rear wheel torque split and thereby producing the best balance between traction and steering response.

Active Yaw Control (AYC, see photo) uses a torque transfer mechanism in the rear differential to control rear wheel torque differential for different driving conditions and limit the yaw moment that acts on the vehicle body. AYC also acts like a limited slip differential by suppressing rear wheel slip to improve traction. AYC was first used in the Lancer Evolution IV launched in April 1996. In comparison to the system used in the Lancer Evolution IX, AYC now features yaw rate feedback control using a yaw rate sensor and also gains braking force control. Monitoring the cornering dynamics on a real-time basis, the system controls vehicle behavior through corners and realize vehicle behavior that more closely mirrors driver intent.

The Active Stability Control ( ASC) stabilizes the vehicle while maintaining optimum traction by regulating engine power and the braking force at each wheel. Taking a step beyond the previous generation Lancer Evolution, the fitting of a brake pressure sensor at each wheel allows more precise and positive control of braking force. ASC prevents the driving wheels from spinning on slippery surfaces and/or in an emergency evasive maneuver or after sudden steering inputs.

The Sport ABS (Sport Anti-lock Braking System) allows the driver to maintain steering control and keeps the vehicle stable by preventing the wheels from locking under heavy braking or when braking on slippery surfaces. The addition of yaw rate sensors and brake pressure sensors to the Sport ABS system has improved braking performance through corners compared to the Lancer Evolution IX.

The use of engine torque and brake pressure information in the regulation of the ACD and AYC components allows the S-AWC system to determine more quickly whether the vehicle is accelerating or decelerating.

S-AWC also employs yaw rate feedback for the first time. The system helps the driver follow his chosen line more closely by comparing how the car is running, as determined from data from the yaw rate sensors, and how the driver wants it to behave, as determined from steering inputs, and operates accordingly to correct any divergence.

The addition of braking force regulation to AYC's main role of transferring torque between the right and left wheels allows S-AWC to exert more control over vehicle behavior in on-the-limit driving situations.

Increasing braking force on the inside wheel during understeer and on the outer wheel during oversteer situations, AYC's new braking force control feature works in concert with torque transfer regulation to realize higher levels of cornering performance and vehicle stability.

Using integrated management of the ASC and ABS systems allows S-AWC to effectively and seamlessly control vehicle dynamics when accelerating, decelerating or cornering under all driving conditions.

S-AWC offers three operating modes: TARMAC for dry, paved surfaces; GRAVEL for wet or unmade surfaces, and SNOW for snow covered surfaces. The driver selects the mode best suited to current road surface conditions.

Twin Clutch SST: Mechanism:  The 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 very 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 mileage.

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.

Normal mode is for use around town and other normal driving situations, Its uses relatively low-speed shift points to deliver unobtrusive shifting for maximum comfort together with optimum fuel economy.

Sport mode is more adapted to driving in the mountains or when engine braking is required. It uses higher shift points and quicker shifting to deliver instant throttle response.

Compared with Sport mode, S-Sport mode keeps the engine turning at higher revs while allowing very fast shifting.

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