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The Acceleration Device allows the rear wheels to be variably overdriven with respect to the speed of the front wheels up to 5. During normal steady state driving, the Acceleration Device input shaft from the engine and output shaft to the rear differential spin at almost equal speeds.
In a cornering situation, the output shaft spins up to 5. The electromagnetic clutch packs, based on sensor inputs, will vary the torque sent to the rear differential from side to side providing constant and dynamic balancing of the car handling characteristics. The SH-AWD configuration with no acceleration device is simpler and overdrives the rear wheels at a constant 1.
This more complex RL configuration could be considered an exclusive flagship vehicle feature, and not specified for vehicles with lower price points. The later SH-AWD configuration without the Acceleration Device could just be a simpler and less sophisticated version due to vehicle dynamics and price points, or it could represent a more refined, less complex and inherently more reliable, new standard SH-AWD configuration. The rationale for the two distinct configurations has not been publicized by Acura.
Like the unit in the RL, both can power the rear wheels with various amounts engine torque. The power split under straight-line, high-speed acceleration varies from vehicle to vehicle. In addition, in cornering situations, dependent on the specific vehicle balance and dynamics, the rearward power transfer ratios in the RDX and MDX differ greatly from the RL and TL sedans. SH-AWD technology is deeply integrated with other systems and sensors implemented in Acura vehicles including:.
Acura RL [10]. The RL is powered by either a 3. However, the front transaxle is directly coupled to a torque transfer unit. Within the torque transfer unit is a short horizontal shaft and a hypoid gear set which turn the propeller shaft ninety degrees and moves it to the vehicle center line. An RL unique, two piece lightweight carbon fiber reinforced drive shaft carries power to the rear differential unit.
Torque vectoring takes place in the rear differential which contains three planetary gear and clutch sets. The rear wheels are always overdriven with respect to the speed of the front wheels. The Acceleration Device can variably overdrive the rear wheel speed up to 5. The system can work because the clutches can slip under circumstances where the vehicle is turning, thus allowing the rear and front wheels to turn at different rates around a curve.
Torque power is routed to the wheels that grip before you can feel the car slip — giving you a renewed confidence in any driving condition. Power is directed in real-time to match your Acura weight distribution as well as other conditions, which results in precise power transitions and the most agile Acura has ever built. Up to percent of available rear axle power can be sent to either rear wheel via a second electromagnetic clutch-actuated rear differential.
During cornering, it can send up to pound-feet of torque to the outside rear wheel to help rotate the vehicle around its center, reducing understeer and improving handling significantly. Behind the scenes, thousands of calculations provide you with the following:. From using the tires to having emergency gear for being stranded.
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