The 2006 Honda Motorcycle Range
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Honda Develops World's First Production Motorcycle Airbag System;
The Motorcycle Airbag System is comprised of the airbag module, which includes the airbag
and the inflator; crash sensors, which monitor acceleration changes; and an ECU, which
performs calculations to instantly determine when a collision is occurring. When a severe
frontal collision occurs, the four crash sensors mounted on the front fork measure the change
in acceleration caused by the impact and convey this data to the airbag ECU, which
determines that a collision is occurring and whether or not it is necessary to inflate the airbag.
If the calculations performed by the ECU indicate that airbag deployment is necessary, the
ECU sends an electronic signal to the airbag inflator, which instantaneously responds by
inflating the airbag. Inflating rapidly after the impact, the airbag can absorb some of the
forward energy of the rider, reducing the velocity at which the rider may be thrown from the
motorcycle and helping lessen the severity of injuries caused by the rider colliding with
another vehicle or with the road.
By conducting extensive crash tests at its indoor omni-directional Real World Crash Test
Facility, applying advanced computer simulation technology, and leading the way with the
introduction of motorcycle rider test dummies, Honda has gathered and analyzed a wide array
of data on the behavior of motorcycles during collisions. Honda has also taken full advantage of
the experience of its automobile operations in the development of airbags, applying its expertise
in the development of the Motorcycle Airbag System.
Motorcycle Airbag System: Principal Components;
The airbag module, containing the airbag and inflator, is positioned in front of the rider.
The airbag ECU, positioned to the right of the module , analyzes signals from the crash
sensors to determine whether or not to inflate the airbag.
Four crash sensors attached on both sides of the front fork detect changes in acceleration caused by frontal impacts.
Shopctions of the Principal Components;
The airbag module contains the airbag and airbag inflator.
The airbag inflator receives an electronic signal transmitted by the airbag ECU instructing
it to release nitrogen gas to inflate the airbag.
The airbag starts to inflate, exerting pressure on the cover of the airbag module, forcing it
to open.
The size and shape of the airbag, the manner in which is secured to the motorcycle with
tethers, and the function of the deflation vents all help to maximize the effectiveness with
which the system absorbs the kinetic energy of the rider, helping control the velocity at
which the rider may tend to be thrown forward from the motorcycle, and thus lessening
the severity of any injuries resulting from impact with another vehicle or with the road.
From the moment an impact is recognized as a collision to the moment of airbag inflation, only 0.060*1seconds elapses.
The airbag ECU continuously monitors the data received from the crash sensors, and by
comparing this data to standard vehicle behavior, determines whether or not it is necessary
to deploy the airbag. The data from each sensor is evaluated independently, and if it is
determined to deviate from programmed standards of safe vehicle behavior by a certain
predetermined degree, an electronic signal is sent to the airbag inflator, which causes the
airbag to inflate.
The crash sensors which monitor acceleration changes are attached to the front fork legs to
optimize the quickness and accuracy of their detection of frontal impacts. No alteration of
the structure of the motorcycle is needed. To optimize the accuracy of collision detection,
a set of 4 sensors are arranged-two on each side of the front fork.
*1 Side collision with a stationary vehicle (Honda Accord) at 50km/h.
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