ISO 20176:2011
Road vehicles — H-point machine (HPM-II) — Specifications and procedure for H-point determination
ISO 20176:2011 provides the specifications and procedures for using the H-point machine (HPM) to audit vehicle seating positions. The HPM is a physical tool used to establish key reference points and measurements in a vehicle. The H-point design tool (HPD) is a simplified computer-aided design (CAD) version of the HPM, which can be used in conjunction with the HPM to take the optional measurements specified in ISO 20176:2011, or used independently during product design.
These H-point devices provide a method for reliable layout and measurement of occupant seating compartments or seats. ISO 20176:2011 specifies the procedures for installing the H-point machine (HPM) and using the HPM to audit (verify) key reference points and measurements in a vehicle.
The devices are intended for application at designated seating positions. They are not to be construed as tools that measure or indicate occupant capabilities or comfort. They are not intended for use in defining or assessing temporary seating, such as folding jump seats.
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1 Scope
2 Normative references
3 Terms and definitions
4 Measurement procedure for the three-dimensional H-point machine
4.1 General
4.2 Summary of installation procedure
4.2.1 Summary
4.2.2 Measured versus design values
4.3 Prepare vehicle and seat
4.3.1 Vehicle
4.3.2 Seat
4.4 Determine the H-point travel path (optional)
4.5 Adjust seat to design intent
4.5.1 Move seat to design intent position
4.5.2 Torso angle and cushion angle
4.5.2.1 General
4.5.2.2 Standard audit: include seat and vehicle build variability
4.5.2.3 Optional audit: exclude seat build variability
4.5.3 Seat in front of test seat
4.6 Install HPM cushion and back pan assembly
4.6.1 Install the cushion pan
4.6.2 Install the back pan
4.6.3 Level the HPM
4.7 Load the HPM
4.7.1 Procedure
4.7.2 Summary table
4.7.3 Load the cushion pan
4.7.4 Load the back pan
4.8 Soak time
4.9 Record measurements — digitize HPM points
4.9.1 General
4.9.2 H-point
4.9.3 Torso angle and cushion angle
4.9.4 Lumbar support prominence
4.9.5 Summary of driver measurements
5 Optional measurements for driver seat
5.1 Leg and shoe installations
5.1.1 General
5.1.2 Mark accelerator pedal centreline
5.1.3 Install the shoe fixture
5.1.4 Install the shoe tool
5.1.4.1 Procedure
5.1.4.2 Interference
5.1.5 Install leg segments
5.2 Record measurements
5.2.1 General
5.2.2 Shoe plane angle
5.2.3 Ball of foot reference point
5.2.4 Accelerator heel point
5.2.5 Accelerator heel point to ball of foot reference point lateral offset
5.2.6 Knee angle and ankle angle
5.2.7 Thigh angle and hip angle
6 Optional measurements for the 2nd or succeeding row passenger seats
6.1 Leg and shoe installation
6.1.1 General
6.1.2 Install the shoe tool
6.1.3 Install leg segments
6.1.3.1 General
6.1.3.2 Reposition the shoe tool (if necessary)
6.1.3.2.1 Conditional checks
6.1.3.2.2 Interference
6.1.3.2.3 Long-coupled seating
6.1.3.3 Short-coupled seating
6.2 Record measurements for rear passengers
6.2.1 Summary of measurements
6.2.2 Floor reference point
6.2.3 Floor plane angle
6.2.4 Knee clearance and legroom
7 Additional optional measurements
7.1 Effective headroom
7.1.1 When to install headroom fixture
7.1.2 Install the headroom fixture
7.1.3 Measure effective headroom
8 Remove the HPM
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1 Scope
2 Normative references
3 Terms and definitions
4 Measurement procedure for the three-dimensional H-point machine
4.1 General
4.2 Summary of installation procedure
4.2.1 Summary
4.2.2 Measured versus design values
4.3 Prepare vehicle and seat
4.3.1 Vehicle
4.3.2 Seat
4.4 Determine the H-point travel path (optional)
4.5 Adjust seat to design intent
4.5.1 Move seat to design intent position
4.5.2 Torso angle and cushion angle
4.5.2.1 General
4.5.2.2 Standard audit: include seat and vehicle build variability
4.5.2.3 Optional audit: exclude seat build variability
4.5.3 Seat in front of test seat
4.6 Install HPM cushion and back pan assembly
4.6.1 Install the cushion pan
4.6.2 Install the back pan
4.6.3 Level the HPM
4.7 Load the HPM
4.7.1 Procedure
4.7.2 Summary table
4.7.3 Load the cushion pan
4.7.4 Load the back pan
4.8 Soak time
4.9 Record measurements — digitize HPM points
4.9.1 General
4.9.2 H-point
4.9.3 Torso angle and cushion angle
4.9.4 Lumbar support prominence
4.9.5 Summary of driver measurements
5 Optional measurements for driver seat
5.1 Leg and shoe installations
5.1.1 General
5.1.2 Mark accelerator pedal centreline
5.1.3 Install the shoe fixture
5.1.4 Install the shoe tool
5.1.4.1 Procedure
5.1.4.2 Interference
5.1.5 Install leg segments
5.2 Record measurements
5.2.1 General
5.2.2 Shoe plane angle
5.2.3 Ball of foot reference point
5.2.4 Accelerator heel point
5.2.5 Accelerator heel point to ball of foot reference point lateral offset
5.2.6 Knee angle and ankle angle
5.2.7 Thigh angle and hip angle
6 Optional measurements for the 2nd or succeeding row passenger seats
6.1 Leg and shoe installation
6.1.1 General
6.1.2 Install the shoe tool
6.1.3 Install leg segments
6.1.3.1 General
6.1.3.2 Reposition the shoe tool (if necessary)
6.1.3.2.1 Conditional checks
6.1.3.2.2 Interference
6.1.3.2.3 Long-coupled seating
6.1.3.3 Short-coupled seating
6.2 Record measurements for rear passengers
6.2.1 Summary of measurements
6.2.2 Floor reference point
6.2.3 Floor plane angle
6.2.4 Knee clearance and legroom
7 Additional optional measurements
7.1 Effective headroom
7.1.1 When to install headroom fixture
7.1.2 Install the headroom fixture
7.1.3 Measure effective headroom
8 Remove the HPM