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Acura RL Features Revolutionary Super-Handling AWD System
 Date: September 01, 2004 00:01
 Submitted by:  Tuan
 Source: Honda Press Release
 Credibility Rating: N/A


WASH INGTON, D.C. – The all-new 2005 Acura RL features a revolutionary all-wheel-drive called Super-Handling All-Wheel-Drive or SH-AWD. The SH-AWD system is the first and only all-wheel-drive platform that distributes the optimum amount of torque not only between the front and rear wheels but also between the left and right rear wheels. The result is uncanny cornering performance that provides incredibly neutral steering and outstanding vehicle stability.

SH-AWD Rear Differential Cutaway

By monitoring driver input and driving conditions, the SH-AWD system determines the optimum front-rear and lateral (left-right) torque distribution. This information is then conveyed to the rear differential, where direct electromagnetic clutches continuously vary the front-to-rear torque by up to 70 percent in either direction. Rear torque can also be apportioned between the left and right rear tires by up to 100 percent on either side.


The SH-AWD system is composed of an ECU, sensors that detect steering angle, lateral g-force, and other vehicle information, and a rear differential. The direct electromagnetic clutches inside the rear differential, another industry first, employ electromagnets to maintain precise control over the multi-plate clutches.


The SH-AWD system uses torque not only for propulsion, but also to increase cornering precision and dramatically enhance vehicle maneuverability while helping to virtually eliminate understeer and oversteer. During cornering the speed of the outside rear wheel is greater than the average of both front wheels. This prevents the efficient transfer of torque to the outside rear wheel in a typical AWD system. To counteract this condition, the SH-AWD system’s rear differential is equipped with a built-in acceleration device that can overdrive the outside rear wheel. This acceleration device, which is another industry first, uses a planetary gear to speed up the outside rear wheel’s rotation relative to the front wheels. The result is a significant enhancement in vehicle maneuverability during cornering.


SH-AWD system torque regulation
· Acceleration while cornering: Torque to the rear wheels is continuously varied to supply up to 100 percent to the outside wheel. This creates an inward yaw moment, significantly improving vehicle turn-in and handling precision.
· Deceleration (throttle closed) while cornering- Torque to the outside rear wheel is varied to change from an inward to an outward yaw moment, helping vehicle stability at all times.
· Straight-line driving - Front-rear torque distribution is modulated for optimum performance. During rapid acceleration, torque is redistributed from the front wheels to the rear wheels. Conversely, during cruising, torque is concentrated in the front wheels. The result is additional driving stability.

Last edited by Tuan on August 28, 2004 17:36

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09-02-2004 23:39 RL vs. car and driver ;)   (Score: 1, Normal) nick79
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