When a gasoline engine goes to full throttle, manifold vacuum drops to nearly zero, thus no vacuum assist to the disc brakes. When disc brakes were first introduced it was determined that a reasonably healthy human can generally be relied upon to apply a minimum of 60 lbs to the brake pedal. With 4 wheel discs and no vacuum assist this 60 lbs reduced braking effectiveness by 50% or more; thus a gas engine at full throttle MAY produce enough power to prevent the vehicle from slowing appreciably, especially if the brakes were hot from applying them lightly for a mile or so. Many modern vehicles have a vacuum pump because the fuel injection systems and engine timing generate relatively little vacuum, but even so - once the brakes are hot, braking effectiveness may not be enough to stop the car. A prudent driver might consider practicing key off-neutral-brake at lower speeds in a parking lot lest they become another statistic.
In 2004 I worked for one of the "majors" in the appliance industry. Our director of quality control owned a late model Toyota used in driving back and forth to work. It was a good "ride" and he enjoyed driving it. He was definitely a stickler on maintenance and had the car serviced every 4,000 miles. One sunny summer day his accelerator "stuck" pushing the car forward to speeds exceeding 80 MPH. Fortunately, he was on I-75 and not on one of Georgia's famous two lane back roads. He knew exactly what to do: 1.) apply brakes, 2.) pull to the shoulder of the road and 3.) cut engine. He did just that. He then restarted the car and eased back onto the interstate thinking the problem was temporary. It was--for about 10 minutes then the very same situation occurred. This time, he parked the car and called AAA for a tow. I do not know the end of the story of even if Toyota solved his problem. I do know he traded cars fairly quickly after that.
Don't think so. Except for auto pilot. But then the computer is flying the aircraft. There are multiple control surfaces and a lost of or errant one is not such a big deal. Pilot error however continues to be a big deal both for airplanes and especially cars. It is an error to ignore the law and paint on the road. Gee, what a change from being a teenager and pushing the limits.
J. Williams, all good points. I would also add that todays drivers seem more interested in texting, putting make-up on, or yapping on the phone than driving and paying attention to their vehicle!
I had a white knuckle experience stoplight racing my 1970 GTO in my younger days. I pressed the brakes to stop for the next light and the pedal went to the floor. I quickly checked cross traffic and applied the emergency brake. I think people forget why it is called an emergency brake, and it saved me and my car that day!
True Elizabeth, this kind of things will affect the brand for sure. Sometimes it will lead to the same situation like Fonterra milk brand facing in Asian market, here the market leader reduce the market share less than 20% within a couple of weeks due to way protean issue.
This has nothing to do with technology or engineering. This is about the old lawyers' motto "follow the money".
If the US can't restrain it's unfettered litigation everytime someone gets hurt - even if it is their own fault - manufacturers' will stop placing new technology on the market. Theres' no sense making 1M$ profit on a bandsaw if I have to give it all to some idiot who puts his hand through it.
Please know how to do this, and practice it in a dual-control car with an expert in the other seat if you are dumb. Brakes, ignition, neutral. If your car accelerates unexpectedly, get on the brakes and STOP the car immediately. Do NOT continue to drive with your foot on the brakes. Pull over and STOP. While you are slowing down, turn off the ignition. Yes, you might lose power steering and a few other power accesories. Sorry for the inconvenience, but you might not be able to use your entertainment system during this incident. You will still be able to steer. While you are coasting to a stop, shift to neutral, just in case your car is possessed and tries to restart itself. It is possible in some cases that the ignition switch might not shut off the engine. If this happens, shift to neutral anyway. No, the engine won't immediately blow up. Modern engine controllers include rev limiting.
Engineers at Fuel Cell Energy have found a way to take advantage of a side reaction, unique to their carbonate fuel cell that has nothing to do with energy production, as a potential, cost-effective solution to capturing carbon from fossil fuel power plants.
To get to a trillion sensors in the IoT that we all look forward to, there are many challenges to commercialization that still remain, including interoperability, the lack of standards, and the issue of security, to name a few.
This is part one of an article discussing the University of Washington’s nationally ranked FSAE electric car (eCar) and combustible car (cCar). Stay tuned for part two, tomorrow, which will discuss the four unique PCBs used in both the eCar and cCars.
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