SAE J941 PDF

Vision Criteria Overview - Automotive Vision Criteria Vehicle design studios require criteria that studies the driver occupant position in relation to external visibility outside the vehicle and internal visibility inside the vehicle. All of the legal criteria must be defined, evaluated, and approved before an interior theme can be completed. However, design changes are inevitable throughout the entire build process. Therefore, obscuration and visibility studies must be an iterative process throughout the overall design and production build process. For example, when the interior dash height directly affects the driver visibility, studies are quickly executed and reviewed for compliance.

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Warrendale, SAE, , p. Manary , Lawrence W. Schneider , Matthew P. Reed , Carol A. Flannagan SAE Recommended Practice J describes the eyellipse, a statistical representation of driver eye locations, that is used to facilitate design decisions regarding vehicle interiors, including the display locations, mirror placement, and headspace requirements.

However, UMTRI data show that the characteristics of empirical eyellipses can be predicted more accurately using seat height, steering-wheel position, and seat-track rise.

A series of UMTRI studies collected eye-location data from groups of 50 to drivers with statures spanning over 97 percent of the U. Data were collected in thirty-three vehicles that represent a wide range of vehicle geometry. Significant and consistent differences were observed between eye-position data collected before and after driving, indicating that actual driving is important protocol feature for accurate measurement of driver eye position.

In six vehicles, eyellipses obtained with two-way and six-way seat-track travel were only slightly different. Comparisons between mean preferred and design seatback angles show that design seatback angle does not accurately predict mean driver-selected seatback angle. On average, drivers select seatback angles that are about 1. Stepwise regression techniques were used to identify the vehicle variables that have important effects on the distribution of driver eye locations.

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The tool consists of series of equations that describe horizontal H-point locations as a function of vehicle H-point height H One series of equations have been established for use in vehicles with H-point heights H30 and steering wheel diameters W9 less than mm and mm, respectively Class A Vehicles. This class of vehicles includes passenger cars, vans, and light trucks. The lines describe the 2. Separate driver selected seat position equations have been established for use in vehicles with H-point heights H30 between and mm and steering wheel diameters W9 between and mm with treadle type pedals Class B Vehicles.

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Development of an improved driver eye position model

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Ocular3D - Automotive Vision Criteria

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