# Presentation: 279614

## Figures to accompany ‘SAE HADD Request for NHTSA Interpretation re DSP Final Rule’ 

- Figures to accompany ‘SAE HADD Request for NHTSA Interpretation re DSP Final Rule’

## Determination of “the front leading surface”

- We intend to use an X-plane tangent to the frontmost edge of the seat cushion to measure the 150 and 250mm distances from the “front leading edge”.

**150**

**250**

**C/L SEAT**

**Unpadded Trim Cover/ Seat Shield**

**Unpadded Trim Cover/ Seat Shield not included**

**SAE J1100 proposals are found on pages 5 and 6 of the MS Word document.**

## Definition of Seating Surface

- H-point travel path – defines travel of seat

- Seat surface if seat is not moveable

- Seat surface if seat is moveable includes the red and black cross hatched surfaces, and the surface connecting them marked by the red boundary

- SAE J1100 proposals are found on pages 5 and 6 of the MS Word document.
- Our proposed operational definition of seating surface does not include any portion of the cushion behind or below the seatback. (repeated on next slide)

## Seating Surface DefinitionProposed for SAE J1100:2009 (see page 6 of Word Document)

- The plan (top) view profile of the seat cushion, with the seat and seatback at its design orientation, including any attached trim (need clarification from NHTSA), throughout all seat travel and attitude adjustments (if any); excluding any portion of the cushion behind or below the seatback.  In instances where more than one seat occupies a row of seating, adjacent seats are considered one continuous surface, unless:
-  Fixed, unpadded trim separates the profiles by at least 140 mm, or
-  The seat cushions are separated by a void that is at least 140mm wide and 140mm deep, or
-  Interior trim interrupts the hip room, or
-  Both surfaces are adjacent outboard seats and the cushions are at least 140 mm apart from every point between them

## Definition of seat surface width, SW18

**150**

**250**

**Unpadded Trim Cover/ Seat Shield**

**Unpadded Trim Cover/ Seat Shield not included**

- SW18

**Measurement Zone**

**C/L SEAT**

**We need a clear, unambiguous operational definition of seat surface width so we all measure surface width in the same way.**

- Question 7a restated from MS Word document:
- How does folding, removing or adjusting a seat affect its surface width?  Please explain. We include this in our proposed definition for SW18, but do not foresee its use.

- We intend to measure SW18 with the seat in its normal riding orientation – facing either forward, sideward, or rearward.
**Does NHTSA concur?**

**Front Leading Edge**

## How is “trim” defined?

- Given unpadded trim that lies on, or is part of, the top surface of the cushion:
- We interpret the seating surface as spanning the entire width of a single bench seat cushion, regardless of any component, which may be part of that cushion.
**Does unpadded mean uncovered?  **i.e. a hard piece of plastic/substrate may be covered by fabric having a minimal thickness of foam backing for aesthetics or to provide a more comfortable customer interface.
- If hard trim on top of the cushion is considered part of the seating surface, then:
- 	Given any dimension ‘D’, the seating surface is dimension ‘A’.
- If hard trim on top of the cushion is not considered part of the seating surface, then
- Given ‘D’ < 140, then ‘A’ & ‘B’ are adjacent and the seating surface is dimension ‘A’
- Given ‘D’ ≥ 140, then ‘A’ & ‘B’ are not adjacent, and the seating surfaces are dimensions ‘B’ & ‘C’

**Unpadded Trim Cover / Seat Shield**

- B

- A

- C

- D

**Embedded Convenience System (Unpadded)**

- A

- For bullet 1

- For bullets 1-4

**We need a clear, unambiguous operational definition of “trim”.**
**This slide assumes the conditions of (c)(2)(ii) are not met.**

## Void between adjacent adjustable seats

- VOID

- To qualify for a void, the space between seat surfaces must be >=140mm. (throughout  the seat travel path in the top view)

## SAE Interpretation of ‘void’

** ****(B) A void whose cross section in each transverse vertical plane within that measurement zone is a rectangle that is not less than 140 mm (5.5 inches) wide and not less than 140 mm (5.5 inches) deep. The top edge of the cross section in any such plane is congruent with the transverse horizontal line that intersects the lowest point on the portion of the top profile of the seating surfaces that lie within that plane **

**150**

**250**

**100x140 Required void: translate/rotate throughout seat adjustment range**

**Q**

**Q**

**Q**

**140x140 void in all cross sections within the zone.**

**Point ‘Q’ shown to illustrate the cross section boundary of the ‘void’.  Point ‘Q’ is the lowest point on the top profile.**
**Does NHTSA agree?**

## Use of (c)(2)(iii) instead of (c)(2)(i)(B) to establish that two seats are not continuous

- Use of (c)(2)(iii) instead of (c)(2)(i)(B) to establish that two seats are not continuous

**The 'void' seems to be an unnecessary condition' to disqualify two surfaces from being adjacent.  The only time, so far as the task force can determine, one would want to use the 'void’ is when there are three bucket, or captains chairs in a row of seating (slide 10).  **
**In any other scenario, you would have two outboard seats and fit under 571.10 (c)(2)(iii).  That is, given two outboard seats, whose cushions are separated by 140mm, there is no need to quantify the 'void.'**

**Does NHTSA agree?**

## Seating with void

- Given 3 seats in a row of seating, if ‘A’ < 140 mm, then the seating surface width is dimension ‘B’.
- If ‘A’ is ≥ 140 mm, but the ‘void’ does not meet the depth condition of (c)(2)(i)(B), then we interpret the seating surface width as dimension ‘B’, also.
**Does NHTSA agree?**

## Hip Room ‘Interruption’ 

- Given 2 seats separated by a center console (or other suitable component), and ‘A’ < 140:
- Does the console represent an ‘interruption’ to the nominal hip room measurement at the physical H-point height only (Situation A), or does an ‘interruption’ occur at the height of the hip room zone (Situation B:  25mm below to 76 mm above the H-point)?
- If either situation applies, we interpret the seating surface as dimensions ‘B’ & ‘C’.  Measurement assumed to be within the 150mm to 250mm zone.
**A clearer wording might be**:
- ...any interruption to the hip room zone established per SAE J1100 about an H-point determined by installing the SAE J826 manikin without legs in the seat.

- A

- B

**Armrest up**

- C

**Hip Room Zone**
**H-Point**

**250**

**Situation A:  console (or other ‘trim’) interrupts the hip room measurement along the X-plane through the physical H-point at the H-point height. **

**Situation B:  console (or other ‘trim’) interrupts the hip room measurement along the X-plane through the physical H-point at a point below the physical H-point height, but within the hip room measurement zone. **

- Hip Room ‘Interruption’

**Does NHTSA agree?**

**Interference @ H-point height**

**Interference @ bottom of Hip Zone**

## Hip Room ‘Interruption’

- Given a split back bench seat with trim components which interrupt the hip room measure (regardless of height interpretation from slide 7):
- We interpret the seating surface as dimensions ‘B’ and ‘C’, in all cases where ‘A’ < 330 mm.
**Does NHTSA agree?**

**250**

**X-Plane through physical H-point**

**Trim or components which visually divide the cushion and interrupt the hip room**

- A

- B

- C

- J1100, revised June 1984:  Section 5.1 Front Seat Compartment dimensions–Driver unless otherwise specified.
- W5–Hip Room – Front.  The minimum dimension measured laterally between the trimmed surfaces on the “X” plane through the SgRP – front within 1.0 in (25 mm) below and 3.0 in (76 mm) above the SgRP-front and 3.0 in (76 mm) fore and aft of the SgRP-front.
- J1100, revised September 2005 Table 15:
- W5–Hip Room (Minimum Cross Car Width at SgRP Zone). The minimum cross car distance between the trimmed door or quarter trimmed surfaces within the measurement zone. The zone extends 25 mm below and 76 mm above SgRP, and 76 mm fore and aft of SgRP. If any portion of this 101 mm by 152 mm area is obstructed by the seat, it is excluded. If the area is totally obstructed by the seat, then measure to the unobstructed trimmed surfaces closest to the SgRP location.
- The suffix following W5 identifies the compartment area for measurement.

## Adjacent Outboard Seats 

- Adjacent Outboard Seats

- Given dimension ‘A’ < 140mm (‘A’ does not meet the definition of a void, and there is no trim between seats):
- We interpret the seating surface as dimension ‘B’ to calculate the #DSP’s.  Measurement assumed to be within the 150-250 mm fore/aft zone.
**Does NHTSA agree?**

- A

- B

**Armrest down**

**Armrest up**

## Adjacent Outboard Seats 

- Adjacent Outboard Seats

- Given dimension ‘A’ > 140mm, and 2 seats separated by a fixed center console (or other suitable component) with a padded lid:
- We interpret the seating surface as ‘B’ & ‘C’ since they meet the exception defined in paragraph (c)(2)(iii).  Measurements assumed to be within the fore/aft zone.
**Does NHTSA agree?**

- A

- B

**Armrest down**

**Armrest up**

- C