[home][rumors and news][model release matrix][tov motorsports][desktop calendar][exhaust notes][tov forums][links][search][sponsors][garage][login]

Tire Rack Upgrade Garage
 Search for a Dealer:
 Canadian Flag US Flag
 Honda Acura
There are currently no active Acura promotions
There are currently no active Honda promotions
Honda releases info on 2025 Civic Hybrid. "the most powerful non-Type R Civic ever"
A little Prelude tidbit that came from last week's dealer meeting...
Acura releases details on upcoming 2025 MDX refresh
Acura confirms debut of long-rumored entry-premium CUV for early 2025
American Honda reports March and 1st Quarter 2024 sales results
Spied on the Street! 2025 Acura MDX Type S
Honda releases details on upcoming 2025 Fuel-Cell Plug-in CR-V
Honda enables Wireless CarPlay and Android Auto on 10th generation Accords via software upgrade
General Talk --> Re: Honda is launching its new electric N-VAN e starting at $15,500
Join Discussion......
General Talk --> Re: Honda Hypercar
Join Discussion......
Professional Motorsports --> Newey makes "secret" visit to Aston Martin??
Join Discussion......
Professional Motorsports --> Re: F1: Honda-Powered Alpine?
Join Discussion......
Amateur Racing & Driving --> Re: 2022 Subaru BRZ at Area 27
Join Discussion......
General Talk --> Re: The Honda Ridgeline Is More American Than Your Ford or Chevy Truck
Join Discussion......
General Talk --> Re: The Old Man's thoughts about Honda's future
Join Discussion......
General Talk --> Re: 2025 Civic Hybrid Reviews are out
Join Discussion......
Honda Power Equipment --> Re: First Mow of the Season - started right up
Join Discussion......
General Talk --> Re: Honda Accord, Passport Struggle As Civic, HR-V Sales Surge
Join Discussion......
Today's Reading Links --> Re: Fisker declares bankruptcy again, vehicles likely orphaned
Join Discussion......
General Talk --> Re: Dealer service costs are crazy out of control
Join Discussion......
Today's Reading Links --> Re: Accord vs. Camry
Join Discussion......
General Talk --> Re: Global Debut: Honda Class 8 Hydrogen Fuel Cell Truck Concept
Join Discussion......
General Talk --> Re: Acura ZDX sales
Join Discussion......
Preliminary RL Info: New "Super Handling AWD" System announced
 Date: March 31, 2004 23:44
 Submitted by:  JeffX
 Source: Honda PR
 Credibility Rating: 10

The following is the press release from Honda's world news site:

Honda Develops World’s First Super Handling All-Wheel-Drive Available this fall in the Acura RL (North America) and the Legend (Japan)

TOKYO - April 1, 2004 --- Honda Motor Co., Ltd. today announced the development of a new Super Handling All-Wheel-Drive system, called SH-AWD, that provides cornering performance that responds faithfully to driver input, and outstanding vehicle stability. A world’s first, the SH-AWD system combines front-rear torque distribution control with independently regulated torque distribution to the left and right rear wheels to freely distribute the optimum amount of torque to all four wheels in accordance with driving conditions. The new system will be available this fall in the Acura RL (North America) and the Legend (Japan).

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 regulate and vary front-rear torque distribution between ratios of 30:70 and 70:30, and lateral torque distribution in the rear wheels between ratios of 100:0 and 0:100. Torque is used not only for propulsion, but for cornering as well, resulting in a significant enhancement in vehicle maneuverability.

The SH-AWD system is composed of sensors to detect steering angle, lateral g, and other vehicle information; an ECU; and the rear differential. The direct electromagnetic clutches inside the rear differential, another world’s first, employ electromagnets to obtain precise control over the multi-plate clutches. Built-in search coils monitor the gaps between the electromagnets and the magnetic body to achieve precise, continuously variable torque regulation.

The rear differential is also equipped with a built-in acceleration device, yet another world’s first. During cornering, the track of the outside rear wheel normally falls outside the average of the tracks of the front wheels. The outside rear wheel does not rotate fast enough to keep up with the front wheels, preventing efficient transmission of torque. To counteract this problem, the SH-AWD acceleration device alters the gearing to speed up the outside rear wheel’s rotation relative to the front wheels. This reduces torque transmission losses and significantly improves vehicle maneuverability.

At Honda, driving pleasure is regarded as one of the most important factors in vehicle development. The new SH-AWD system features “feed-forward” control, which utilizes the degree of driver input to determine appropriate torque distribution. This results in a super-neutral steering feel that responds with optimal faithfulness to the driver’s handling of the steering wheel, realizing outstanding driving comfort and stability.

SH-AWD system (rear differential cutaway model)

  • Torque Distribution Regulation
    • Acceleration during cornering
      Torque to the rear wheels is continuously varied to supply up to 100% to the outside wheel and 0% to the inside wheel. This creates an inward yaw moment, significantly improving vehicle handling.
      *Yaw moment is turning torque relative to the vertical axis running through the vehicle’s center of gravity.
    • Deceleration during cornering (throttle closed)
      Torque to the outside rear wheel is freely varied to change from an inward to an outward yaw moment, ensuring vehicle stability at all times.
    • Straight-line driving
      Front-rear torque distribution is regulated for optimum performance in accordance with the amount of torque produced. During rapid acceleration the load on the front wheels is reduced; conversely, rear-wheel load is reduced during cruising. The result is stable driving at all times
  • System Configuration
    • World’s first direct electromagnetic clutch
      An electromagnetic coil (electromagnet) attracts a magnetic body which, in turn, presses on the multi-plate clutch to facilitate torque transmission. A compact clutch unit, equipped with a planetary gear step-up mechanism to increase torque, permits transmission of substantial amounts of torque. A built-in search coil monitors the gap between the electromagnetic coil and the magnetic body. Current flow in the electromagnetic clutch is then adjusted to achieve highly precise torque regulation.
    • Acceleration Device
      During straight-ahead driving, the twin-pinion planetary carrier spins in synchronization with the propeller shaft, causing the front and rear wheels to turn at the same speed. When the vehicle enters a curve, however, the planetary carrier is locked to the case, releasing the device from synchronization with the propeller shaft and accelerating the rotation speed of the rear wheels. A hydraulic actuator which turns the clutches on and off, and a one-way clutch are included in this compact configuration.
    • Sensors, ECU
      The input of steering angle, lateral g, yaw rate, wheel speed and other sensors monitor driver input, vehicle demeanor, and driving conditions such that the SH-AWD ECU can calculate ideal torque distribution.
  • System Overview
  • Operational Flow
  • Rear Differential Unit

NOTE: It should be noted that though it carries a different name, this system is a mechanical evolution of the VTM-4 system currently found in the MDX and Pilot.

Last edited by JeffX on April 05, 2004 09:54

Click Here to Submit Your Comments

Viewing Threshold (What is this?)

[fancy] [flat] [simple]
Subject Thread Originator Replies Last Post
  And I thought it couldn't get better after the TL...
Power Of Dreams 3
  New M45
ceric 5
  CMS & HiDS - Possible High Tech Features in RL
Wizard 4
  More news tonight (U.S. PDT Tuesday)?
myhui 2
  TL 6 speed sales?
  Pricing of the new 2005 RL
Paul Perakos 42
  AWD comparison?
jc321 0
  but how much power can this handle?
edwinx 4
  Amazing...but why? (long)
BigEl 6
  Some News from an Acura Rep.
Slangin Ac 1
  April Fool?
Kaiso King 5
  SH-AWD video.
le 28
  What is the difference between VTM-4 and SH-AWD
_Alex_ 22
  New Accord??
i-vtec i-rule 17
  Shawn, Any idea how you are going to dyno it?
Mike Freitas 2
  More Info!
Whipping Boy 14
  Hyundai Sonata or BMW 5/6-series?
tsxfan19 6
  Body Design
bowersan 8
  Inspire Engine?
Freak! 0
  '05 RL Press preview time...
Mike Freitas 0
  Drive Train Sure Looks Like IMA Hybrid
gs-legend 1
  RL pic
username 18
  Can any one see where this is going RLCoupe? NSX?06TSX, 05MDX? Geez!!!!!!!!!
Acura Type S'in 3
  Rally Worthy?
gavinjung 0
  Any hope for Europe?
franckv 2
  So what are the chances....
Greg321 2
  Credibility Rating: 10 -> LOL
BB88 4
  FWD or RWD... Thanks.
le 6
  AWD Become FWD after 18mph?
silverf161 2
  Wow !
donnydjr 3
  So far, so good. SH-AWD = VTM4 v2.0
JeffX 4
  Hope the car looks good..
rkn 2
  wow, >1000 views in just over an hour
JeffX 5
  6-Speed M/T? 6SPEED A/T?
mkrsx2003 2
  Type SH.. ATTS is back!
TonyEX 7
  why does it have to be april 1st?
former user 6
  Try this link for video on the system(Japanese)
Acuraserviceman 5
  Other interesting tidbits...
notyper 0
  The options should be FWD or AWD
KIWICanuck 0
  Same tech as in FSX Concept car?
tmkarab 0
  Ahhhhhh yeahhhhhhhh!!!!!!!! 300hp superhandling AWD, I am writing the check!
Acura Type S'in 2
  SCOOP! More RL info!
VTEC Penis 3
  What in the hell?
Prox Enmity 0
  Believe it or not, there's more way cool stuff
JeffX 4
  Thanks Honda
key123 0
  This is only the begining!
TR 1
  Acura RL prototype debut date: Apr 7 !
Spiritualist 0
  This car will KILL my wallet!
KenB 0
  NSX posibilities?
FMKorg 1
vtecascendency 0
  I kneel at the alter of the Honda gods!
90Accord 0
  When will more info be released?
Freak! 0
uhhhh 0
  Good Job Honda R&D
TheAnswer 1
View this profile on Instagram

TEMPLE OF VTEC (@temple_of_vtec) • Instagram photos and videos

First Drive: 2023 Acura Integra - Rebirth of an Icon?
Read Article....................
2023 Acura Integra PR Photo Gallery
Read Article....................
2022 Acura MDX Specs and Features
Read Article....................
2022 Honda Civic Design Story, a video by Honda
Read Article....................
Photo Gallery: 2021 Acura TLX Advance
Read Article....................
Photo Gallery: 2021 Acura TLX A-Spec
Read Article....................
Contact TOV | Submit Your Article | Submit Your Link | Advertise | TOV Shop | Events | Our Sponsors | TOV Archives
Copyright © 2023 Velocitech Inc. All information contained herein remains the property of Velocitech Inc.
The Temple of VTEC is not affiliated with American Honda Motor Co., Inc. TOV Policies and Guidelines - Credits - Privacy Policy