Head Restraint IWG Document: HR-1-4
Comparison of Head Restraint Regulations FMVSS 202
(Current standard, Final Rule, and ECE 17)Head Restraint U.S. – FMVSS 202 US FMVSS 202 ECE 17Comments
Component(current)Final Rule
A. Application
1. Vehicles
Front outboard seating Front outboard and rear Front outboard and rear -If HR present in rear
positions in passenger outboard (optional) (optional) seating seat, ECE 17 and 202
cars, MPVs and trucks seating positions in positions in vehicles of Final Rule regulates.
passenger cars, MPVs categories M1 and N, -ECE 17 regulates rear with a GVWR ? 4536 kg
and trucks with a GVWR and of vehicles of center head restraints if
categories M2 and M3, available.? 4536 kg, with added
not covered by exclusion for seating
Regulation No. 80position adjacent to aisle
on buses (more than 10
seats)
2. Requirements
a. Height
1. Front outboard
A. FixedAt least 700 mm above Increased to 800 mm Same height as FR, but Different seat set-up
H-point as measured above H-point and measured from R-point. and measuring
parallel to the torso measured with a SAE Seat back angle is 25 techniques used.
reference line. J826 manikin. Seat back degrees or manufacturer
angle set at 25 degrees. specified. Seat cushion
Seat cushion at highest at lowest position
position.
B. AdjustableSame as 202-fixedMust achieve a height of Same height as FR, but Different seat set-up
800 mm and cannot be measured from R-point and measuring
adjusted below 750 mm. and at manufacturer’s techniques used.
Measured with a SAE suggested angle or 25
J826 manikin. Seat back degrees. Seat cushion in
angle set at 25 degrees. highest position.
Seat cushion in highest
position.
DRAFT1
February 14, 2005
Head Restraint IWG Document: HR-1-4Head Restraint U.S. – FMVSS 202 US FMVSS 202 ECE 17Comments
Component(current)Final Rule
(202 Final Rule: Rear head restraint means a rear seat back, a. Height (cont.)or any independently adjustable seat component attached to or 2. Rear outboard adjacent to a seat back, that has a height equal or greater than
700 mm, in any position of backset and height adjustment.)
A. FixedNot specifiedIf provided, minimum If provided, same height Different seat set-up
height of 750 mm above as FR, but measured and measuring
H-point. Measured with from R-Pointtechniques used.
SAE J826 Manikin.
B. AdjustableNot specifiedIf provided, no If provided, same as FR, Different seat set-up
adjustment below 750 but measured from R-and measuring
mm from H-point. Pointtechniques used.
Measured with SAE
J826 Manikin.
3. Rear Center
Not specifiedNot specified If provided, minimum
height of 700 mm above
R-point
b. Backset
1. Front outboard Not specifiedBackset limited to a No backset specified, but Different seat set-up positionsmaximum 55 mm as there is a general and measuring
measured with HRMD. requirement for the seat techniques used.
Head restraint in at any back angle to be set at
height adjustment manufacturer’s
between 750 and 800 suggested angle or 25
mm, inclusive. Seat degrees and the seat
back angle set at 25 cushion to be in the
degrees. Seat cushion at lowest position.
highest position.
DRAFT2
February 14, 2005
Head Restraint IWG Document: HR-1-4
Head Restraint U.S. – FMVSS 202 US FMVSS 202 Final ECE 17CommentsComponent(current)Rule
c. Width
1. Front outboardMinimum of 171 mm on Minimum of 170 mm on Minimum of 170 mm for US requires wider HRs
single seats and 254 mm single seats (outboard all seat types. on front outboard seats
on bench seatsseats with no seat in with a center seat
between) and 254 mm on between them.
bench seats (outboard
seats with seat in
between).
2. Rear outboardNot specifiedIf provided, minimum of If provided, minimum of
170 mm for all seat types170 mm.
d. Height of adjustable head restraint front
surface
Not specifiedNot specifiedMinimum height of 100
mm
e. Gaps
1. All outboard Not specifiedIn all positions, gap -In lowest position, gap -ECE 17/25 does not positionsbetween HR and seat specify load placed on is ? 25, with no reference
back and within the HR the sphere to measure to backset adjustment.
gap.is ? 60 mm. A 165 mm Measured along straight
-ECE 17/25 measures sphere is pressed against line between HR and seat
the gap between the HR the gap with a load no back.
in the lowest position more than 5 N -In other positions the
and seat back gap ? 60 mm as
differently from the measured with 165 mm
gaps in the HR. dia. sphere.
-Larger gaps allowed -Gaps larger than 60 mm
by ECE, but must be are allowed if they pass
tested. the energy absorption
test.
DRAFT3
February 14, 2005
Head Restraint IWG Document: HR-1-4
Head Restraint U.S. – FMVSS 202 US FMVSS 202 ECE 17CommentsComponent(current)Final Rule
f. HR Adjustment Retention Devices (locks)
1. HeightNot specifiedMust maintain height in If adjustable, requires ECE has no downward
highest position and at automatic locking system testing requirement.
800 mm and 750 mm for (ECE 17, 5.1.1). No
front and rear seats (if downward test required.
HR provided),
respectively, while a
downward force is
applied. Seat back is
rigidly constrained.
2. BacksetNot specifiedUnder applied rearward Not specified.
moment, while adjusted
to 800mm for front and
750mm for rear (if
provided), HR must
maintain any position of
backset adjustment. Seat
back is rigidly
constrained.
g. Removability
1. FrontNot specifiedCan be removed with Same as 202 FR
deliberate action distinct
from any act necessary
for adjustment.
2. RearNot specifiedCan be removed with Same as 202 FR
deliberate action distinct
from any act necessary
for adjustment.
DRAFT4
February 14, 2005
Head Restraint IWG Document: HR-1-4Head Restraint U.S. – FMVSS 202 US FMVSS 202 Final ECE 17Comments
Component(current)Rule
h. Clearance
Not specified25 mm clear space If HR provided, 25 mm -In ECE the 25 mm gap
allowed where rear HRs, clear space allowed is measured from any
when seat is occupied, where interference with vehicle structure, not
interfere with roofline or vehicle structure. Seat just roofline or rear
rear window. does not need to be window as in FR.
occupied. Minimum -ECE requires a
height of 700mm must minimum seat height if
be maintained.HR is present. FR
defines a rear HR as
having a height greater
than 700 mmi. Non-use positions
1. FrontNot specifiedNot allowedAllowed, provided HR
automatically returns to
proper position when
seat is occupied.
2. RearNot specifiedAllowed, provided HR Allowed as long as non-US rule defines “clearly
automatically returns to use position is “clearly recognizable” as being
proper position when recognizable to the rotated forward or
seat is occupied or the occupant”.rearward 60?.
HR is rotated a minimum
of 60? forward or
rearward.
j. Radius of Curvature
Not specifiedIn NPRM, requirement Parts of front and rear of Deleted in FR because
was same as ECE 17. HR shall not exhibit a enforcement outweighs
Requirement was deleted radius of curvature less benefits.
in final rule.than 5 mm.No commenter had info
to support reg.
DRAFT5
February 14, 2005
Head Restraint IWG Document: HR-1-4Head Restraint U.S. – FMVSS 202 US FMVSS 202 Final ECE 17Comments
Component(current)Rule
k. Energy Absorption
Not specifiedFront of HR impacted Similar to FR: Uses Tests in ECE and FR
with head form at v=24.1 pendulum impactor with are functionally
km/h. 3ms deceleration same weight and equivalent. Except FR
of head form must not velocity as linear does not test rear of
exceed 80gs . Impactor impactor. Front and rear HR.
is linear head form with of HR tested.
mass of 6.8 kg.
l. Displacement Test Procedures
Load is applied to back Test procedure modified Same load and FR provides a detailed
pan of seat, load is from 202. Seat back and displacement test procedure,
applied to head restraint HR loaded together. requirements as FR.including load hold
after seat load is removed. Moments and times.
102 mm of displacement displacements same.
allowed with 373 Nm Maximum load the same,
moment. Load is seat back cannot fail.
increased until 890N or Use spherical form to
seat back fails. Use apply load
spherical or cylindrical
form to apply load.
m. Dynamic sled test (optional)
Seat accelerated so the New corridor based on Not specified
pulse falls in a corridor scaled version 208 sled
defined by 2-? sine test. Target pulse the thwaves with amplitudes of male same as 202. 502278 m/sdummy used in any seat, and 86 m/s.
HR adjusted midway Corridor cannot be met. thbetween lowest and 95 male dummy used,
highest position and any max rotation 45?.
backset position. 12?
max rotation.
DRAFT6
February 14, 2005