VIEWS: 0 PAGES: 9 POSTED ON: 7/8/2011
It’s Curtains for Rollovers Michael Paine Vehicle Design & Research Pty Ltd Overview • Intrusive side impacts and rollover crashes account for one third of all light vehicle occupant fatalities • Head protecting side curtains and Electronic Stability Control (ESC) could dramatically reduce these fatalities Head Protection in Side Impacts In!atable Tubular Structure Head/thorax side airbag Side Curtain Side impact by large vehicle Pole Impact (ANCAP) Head Protection Works! • Both types of crash test show that head-protecting side airbags can turn a likely fatality into an easily survivable crash Serious head injury unlikely Fatal head injury likely Real World Crashes - Side Impacts • Insurance Institute for Highway Safety (IIHS) analysed side impact crashes of vehicles with and without head- protecting side airbags. 45% fatality reduction • Benefits can be expected to be greater in intrusive side impacts. Assume 50% saving for all intrusive side impact fatalities (conservative) Curtains can protect in rollover crashes Curtains which deploy and stay in place during a rollover crash can protect occupants by: • Cushioning head impacts • Preventing partial head ejection These rally drivers are wearing full harnesses! Curtain stays inflated Real World Crashes Rollovers • 1995 Henderson/Paine study analysed Australian rollover crash fatalities • In a quick review of those cases, it is estimated that 25 out of 41 (61%) could have benefited from a side curtain (which were not available at the time of the study). • Assume 50% saving for all rollover fatalities, once technology is developed Crash Reductions from Curtains Light Vehicle Occupant Fatalities Electronic Stability Control • Basic ESC detects when the vehicle is not following the intended course and applies braking to correct the vehicle motion • More advanced ESC can intervene and prevent excessive steering action Real World Crashes - ESC • Insurance Institute for Highway Safety (IIHS) analysed single vehicle crashes of vehicles with and without ESC. 56% fatality reduction • NHTSA reported a 30% reduction in single vehicle crashes of cars and 63% for SUVs (Four-wheel- drives). This was for a limited number of models. Assessing ESC Performance • NHTSA is currently investigating ways of assessing the performance of ESC systems. These generally involve extreme lane-change manoeuvres or question mark turns • A NHTSA goal is to keep the vehicle on the road with ESC because most rollovers occur once the vehicle leaves the tar. Less than 4% of all rollover accidents are “on-road” and “untripped” Assessing ESC Performance Will ESC cope with • Tyre blowouts • Over-correcting after a wheel drops off the tar (12% of Australian rollovers) ? Crash Reductions from ESC All Crashes Crash Reductions from ESC Rollovers In a quick review of the 1995 study cases, it is estimated that 16 out of 41 (39%) could have benefited from ESC (which was not available at the time of the study). Where to from here? • Develop ways to encourage head- protecting side airbags • Investigate the benefits that curtains might provide in rollover crashes and ways to assess this protection • Develop ways to encourage ESC • Investigate the types of crashes that might benefit from ESC and ways to assess the systems • A role for NCAP?
Pages to are hidden for
"It's Curtains for Rollovers"Please download to view full document