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Wagons Volvo XC70 Volvo XC70 Safety Issues
122 messages, Last post on Dec 28, 2008 at 4:26 PM
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Replying to: dae (Jun 26, 2006 11:51 am) Honda's version also has roll-over sensor to deploy curtain air-bag. Please do not post nonsense. Yaw is sideways movement or rotation about a vertical axis such that the vehicle is off its intended path, e.g., a skid. Roll is rotation about a longitudinal horizontal axis. ESC systems have yaw sensors but NO roll sensors. Honda's rollover sensor simply deploys the airbags if a rollover occurs. There is no interaction with the ESC system (VSA) to prevent rollovers. The XC90 has a full-fledged ESC system (DSTC) that includes active yaw control; i.e., inputs from the steering wheel, wheel speed and yaw sensors are used to control vehicle dynamics by throttle modulation and 4-wheel independent braking. Additionally, it has active roll control, whereby inputs from roll sensor(s) are also used to adjust vehicle dynamics via the DSTC system to help prevent rollovers. Incidentally, the XC90 curtain airbags are designed to deploy in a rollover and remain inflated for an extended period to provide head protection - same functionality as Honda's rollover sensor.
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Replying to: calhon (Jun 26, 2006 6:02 pm) How about letting the driver make those educated desisions. And if the driver is INCAPABLE of driving, how about TAKING THE BUS? To me, all those gadgets are just a hindering to driving. What if I want to drive on the 2 wheels on one side? At least I can completley turn off VSC in the Honda. And If I want to drive in 5th gear at 30 mph, I can, likewise, I can drive 80 mph in 3rd if I want to. And if I want the rear to swing out as I make a tight turn, I can, because I control the car, not the car controlling me |
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Replying to: dae (Jun 26, 2006 11:51 am) Obviously, you have no idea what you are talking about. Why would you need thicker steel, which makes a car heavier and cuts fuel efficency if you can achieve BETTER results with a harder stronger alloy?
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Replying to: blueiedgod (Jun 27, 2006 7:23 am) Because not enough people want a manual XC90 to justify building one. You can turn off the DSTC system in the XC90(But not the RSC system). With the Geartronic you can drive in whatever gear you want and the system won't change gears, even at redline. |
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Replying to: dae (Jun 26, 2006 11:51 am) As others have posted, and I'm sure you are aware, yaw is different than roll. Yaw is a sliding motion. Roll is a pitching motion. It is possible to have a rollover without any yaw motion at all. Honda's version also has roll-over sensor to deploy curtain air-bag. Hondas version deploys the airbag when a rollover is IN PROGRESS. It does nothing to actually prevent a rollover from occuring.
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Replying to: blueiedgod (Jun 27, 2006 7:23 am) Unfortunately they don't make enough buses! All this rollover and anti skid technology is a result of early SUVs getting a bad reputation due to people driving them like performance cars - remember the Trooper or early Bronco - vehicle design or driver, maybe bit of both? And of course, from that is companies being sued. Every year, at the first snow fall, it is the SUVs in the ditch. |
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Replying to: blueiedgod (Jun 27, 2006 7:23 am) Let's put aside imprudent behavior for the moment. How many drivers have the training AND the practice to control a skid at 40+ mph due to sudden changes in road conditions, such as a puddle of water, an ice patch or gravel? How many can safely maneuver around an unexpected obstacle at moderate or higher speeds? The answer on both counts is probably less than 5% and that's not going to change. If you're in the tiny minority, you are still at risk from the over 95 out of 100 drivers without those skills ... even when you're not on the road. You could be mowed down by an out-of-control SUV in your front yard or living room. |
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Replying to: blueiedgod (Jun 23, 2006 3:45 am) In the end it is just a different name for the same system. Actually, and this is often omited by many description, there is a point at which the XC90's roll-over control behaves quite opposite to other conventional systems, and this makes all the difference. In a situation, where "conventional" Electonic Stability Control system will keep the pivoting wheel locked, because of the yaw sensor, the gyro sensor will override it, unlocking the wheel momentarily, allowing for the lateral move to prevent a roll-over. The engineering behind of this system is truly amazing, and in my particular case, I believe it has saved lives of my entire family when I had to perform the "moose avoidance" maneuver on a pin-sharp blind 180 degree turn on the edge of cliff somewhere between Germany and Check republic. I did not have time to brake and most likely would NOT make the turn at my speed, so I have recalled the Drive for Life event and just swirl the steering wheel into the direction of the turn as hard as I could. After a few moments of rocking, brake screeching (engaged by the RSC), family yelling, etc., we ended up around the corner on the right lane facing right direction. I would not be writing this, if not for the amazing Volvo engineering. And once is one time too many for those accidents. |
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Replying to: rodut (Jun 23, 2006 7:12 am) The electronics IS a best compromise to get the most for least money. The industrial/automotive electronic component are relatively inexpensive and unbelievably reliable. Anyone from the industrial QA will tell you that electronics on average far more reliable than the mechanical devices. In my driving experience, the only potentially dangerous failure I ever have was with the Honda Accord, when I loose all braking coming to the red light, and had to use a curb as a mean of slowing down. The brake master cylinder had a casting defect, and a large cavity had opened, overflowing the braking fluid around the piston. So - mechanical defect and Honda - but not the electronics and Volvo. Stuff happens. No brand is completely failure-proved. |
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Replying to: calhon (Jun 27, 2006 11:43 am) Why not start there and MAKE people learn how to drive? I took my driving test when I was 17. I have not been re-tested since. I am 31 now, a lot can happen in 14 years. It scares me to think that 50 year olds drivng around today were tested some 35 years ago. And the test it self was joke. Drive straight, turn left, turn right, parallel park, make a 3 pointed u-turn. What about accident avoidance maneuvers? What about skid control? Some countries, Japan for example, have very stringent testing to get a driver's license. That way it limits the number of numbskulls behind the wheel posing danger to other people on the streets. In the US, we compensate for lack of driver's skill with bigger, heavier more electronic ladden vehicles. Why not solve the problem at the root, make every one go to Skip Barber or similar driving schools, make road tests a little more difficult than simple maneuvers. I guess, it would be too much to ask people to be responsible for their own actions.
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