SAE J4003_200810

Foreword
Introduction
1 Scope
  1.1 Rationale
2 References
3 Definitions
4 HPM Benchmarking - Overview and Preparations
  4.1 Use of the Physical Tool (HPM) and the CAD Tool
       (HPD)
       4.1.1 Use of HPM
       4.1.2 Use of HPD in CAD
  4.2 Prepare the Property for HPM Installation
       4.2.1 Temperature
       4.2.2 Leveling
       4.2.3 Grid Reference
       4.2.4 Accelerator Pedal
       4.2.5 Seat Break-in
       4.2.8 Seat Recovery
       4.2.7 Muslin Cloth
       4.2.8 Seat Attitude and Location
5 Benchmarking the Driver Seat
  5.1 Prepare the Physical Property
  5.2 Digitize Interior Components
       5.2.1 Seat Travel Path
       5.2.2 Other Interior Features
  5.3 Establish PRP, AHP and Pedal Plane Angle
       5.3.1 Install the Shoe Fixture
       5.3.2 Install the Shoe Tool
       5.3.3 Record Pedal Reference Points
  5.4 Install HPM Cushion and Back Pan Assembly
       5.4.1 Install the Cushion Pan
       5.4.2 Install the Back Pan
       5.4.3 Install the Head Room Fixture (optional)
       5.4.4 Set Initial Back Angle
       5.4.5 Level the HPM
  5.5 Load the HPM
       5.5.1 Load the Cushion Pan
       5.5.2 Load the Back Pan
       5.5.3 Soak Time
  5.6 Digitize HPM Points
       5.6.1 H-point
       5.6.2 Cushion Angle, Back Angle, LSP
  5.7 Calculate SgRP
       5.7.1 Translate Seat Travel to H-Point Travel Path
       5.7.2 SgRP for Seats With No Fore/Aft Adjustment
       5.7.3 SgRP for Seats With Fore/Aft Adjustment
  5.8 Reposition Seat to SgRP
  5.9 Install Leg Segments (optional)
  5.10 Record Measurements
  5.11 Remove the HPM
6 Benchmarking 2nd or Succeeding Rows, Outboard Passenger
  Positions
  6.1 Prepare the Physical Property
  6.2 Position Seats
  6.3 Install the Shoe Tool
       6.3.1 Interference at the Ankle Circumference
       6.3.2 Interference at the Front of the Shoe With
             Short-coupled Seating
  6,4 Install and Load Cushion Pan, Back Pan, and Head Room
       Fixture
  6.5 Install Leg Segments (optional)
       6.5.1 Short-coupled Seating
       6.5.2 Long-coupled Seating
  6.6 Record Measurements
       6.6.1 Digitize HPM Points
       6.6.2 Floor Reference Points
  6.7 Remove the HPM
Annex A (Informative) CAD Procedures Using HPD in
                      Benchmarking
  A.1 Overview of CAD Procedures
  A.2 Driver Seat Position
       A.2.1 Establish Pedal Plane Angle, PRP, and AHP
       A.2.2 Translate Seat Travel to H-Point Travel Path
       A.2.3 Determine SgRP for Adjustable Seats
       A.2.4 Position HPD at SgRP
       A.2.5 Position HPD Shoe, Thigh and Lower Leg
       A.2.6 Record Measurements
  A.3 Procedure for 2nd or Succeeding Row Outboard Seating
       Positions
       A.3.1 Establish Seat Positions
       A.3.2 Position the HPD Cushion and Back Pan Assemblies
             in Test Seat
       A.3.3 Position Shoe Tool, Thigh and Lower Leg
       A.3.4 Record Measurements
Annex B (Informative) Summary of Benchmarking Procedures
Annex C (Informative) Summary of Benchmarking Measurements
Bibliography

Describes the specifications and procedures to establish consistent measurements for benchmarking vehicle seating positions using the H-Point Machine (HPM-II ) described in SAE J4002 and the H-Point Design tool (HPD) described in SAE J4004.

Benchmarking is used to discover the design intent measurements for seating compartments in vehicles when these measurements are either unknown or are specified using differing measurement procedures.This document provides the specifications and procedures to establish consistent measurements for benchmarking vehicle seating positions using the H-Point Machine (HPM-II2x) described in SAE J4002 and the H-Point Design tool (HPD) described in SAE J4004. The HPM-II is a physical tool used to establish key reference points and measurements in a vehicle (Figure 1). The HPD is a CAD tool that aids in the benchmarking process (see Appendix A and SAE J4004).