Prius with stuck accelerator glides to safe stop

Mark Wein

Grand Poobah
Staff member
This is going to wreck Toyota :(





http://news.yahoo.com/s/ap/us_runaway_prius


EL CAJON, Calif. – A California Highway Patrol officer helped slow a runaway Toyota Prius from 94 mph to a safe stop on Monday after the car's accelerator became stuck on a San Diego County freeway, the CHP said.
Prius driver James Sikes called 911 about 1:30 p.m. after accelerating to pass another vehicle on Interstate 8 near La Posta and finding that he could not control his car, the CHP said.
"I pushed the gas pedal to pass a car and it did something kind of funny... it jumped and it just stuck there," the 61-year-old driver said at a news conference. "As it was going, I was trying the brakes...it wasn't stopping, it wasn't doing anything and it just kept speeding up," Sikes said, adding he could smell the brakes burning he was pressing the pedal so hard.
A patrol car pulled alongside the Prius and officers told Sikes over a loudspeaker to push the brake pedal to the floor and apply the emergency brake.
"They also got it going on a steep upgrade," said Officer Jesse Udovich. "Between those three things, they got it to slow down."
After the car decelerated to about 50 mph, Sikes turned off the engine and coasted to a halt.
The officer then maneuvered his car in front of the Prius as a precautionary block, Udovich said.
In a statement, Toyota said it has dispatched a field technical specialist to San Diego to investigate the incident.
Toyota has recalled some 8.5 million vehicles worldwide — more than 6 million in the United States — since last fall because of acceleration problems in multiple models and braking issues in the Prius.
Toyota owners have complained of their vehicles speeding out of control despite efforts to slow down, sometimes resulting in deadly crashes. The government has received complaints of 34 deaths linked to sudden acceleration of Toyota vehicles since 2000.
One of the crashes claimed the life of a CHP officer last August.
Off-duty CHP Officer Mark Saylor was killed along with his wife, her brother and the couple's daughter after their Lexus' accelerator got stuck in La Mesa.
The Toyota-manufactured loaner vehicle slammed into a sport utility vehicle at about 100 mph, careened off the freeway, hit an embankment, overturned and burst into flames.
 
Can you just throw your Prius into neutral at 90 mph? I really have no idea.

You can, but the issue is what Mark said, the computer system is the thing they now think is failing. At that point you can pull all the knobs and levers you want, HAL's in control.
 
I've never driven a car that you couldn't shift from either drive or reverse into neutral, regardless of speed.

Then again, my newest car is 6 years old and is a manual shift. New cars may very well have computer controlled shifters or something that would keep you from doing it.

Maybe we should rethink this whole high tech thing when it comes to economy cars. :shrug:
 
You can, but the issue is what Mark said, the computer system is the thing they now think is failing. At that point you can pull all the knobs and levers you want, HAL's in control.

You can slide the shifter into neutral, but the car doesn't shift into neutral?
 
You can slide the shifter into neutral, but the car doesn't shift into neutral?

It wouldn't surprise me at all if newer cars had an electronic relay instead of manual linkage between the shifter and the transmission, and if it's an electronic relay, then the onboard computer is probably telling it not to shift if the car is moving. I don't know that for a fact, but it really wouldn't surprise me.
 
It wouldn't surprise me at all if newer cars had an electronic relay instead of manual linkage between the shifter and the transmission, and if it's an electronic relay, then the onboard computer is probably telling it not to shift if the car is moving. I don't know that for a fact, but it really wouldn't surprise me.

That would be pretty frightening.
 
Didn't mythbusters try that kind of thing when they were testing the switch to reverse. I think they were trying to switch an automatic into reverse and couldn't get it to go so they opted for neutral and it didn't really work.
 
I thought this was going to be a joke.

RUNAWAY PRIUS REACHES DIZZY SPEED OF 28 MPH!!!
 
Didn't mythbusters try that kind of thing when they were testing the switch to reverse. I think they were trying to switch an automatic into reverse and couldn't get it to go so they opted for neutral and it didn't really work.

They were trying to get it into reverse from drive at 60mph or something. They settled for park instead.

They were able to get it into park, but the brake mechanism inside the transmission didn't work, so the car just coasted to a stop instead of the rear wheels locking up.

And, the car they were using was a late 80s Crown Vic, so its computer probably only did timing and maybe idle at best.
 
The cars in question have regenerative braking.

It's a system where the power that normally is dispelled as heat on the brakepads instead is partially reclaimed by using the braking to turn electric motors in the wheel areas. It's apparently a combination of hardware/software and environment like they're braking, hit a bump, the anti-lock kicks in briefly, then the braking mistakenly sends the "extra voltage" to the accelleration. A hybrid uses the electric motor for sustained driving but when you accellerate the gas motor sends extra voltage to give more power. This is the combination that is the problem.

It really is a complex system and I'm sure they'll get it worked out. It's similar to early airbags blowing up when bumping a curb in a parking lot. You never hear about those issues anymore... it's just that these hybrids were really pushed out quickly because of the gas crunch. Had they rolled out in smaller numbers, these issues would have been on a smaller scale and fixed, but it's a big deal because so many of this early generation were sold so fast.
 
Didn't mythbusters try that kind of thing when they were testing the switch to reverse. I think they were trying to switch an automatic into reverse and couldn't get it to go so they opted for neutral and it didn't really work.

Have you ever accidentally hit neutral while driving? I have. The tranny disengages and you coast.

Prages brings up a good point, though -- have they changed over to relays and drive-by-wire, thus eliminating any mechanical association between the cockpit and the engine? If so, kinda scary.
 
Have you ever accidentally hit neutral while driving? I have. The tranny disengages and you coast.

Prages brings up a good point, though -- have they changed over to relays and drive-by-wire, thus eliminating any mechanical association between the cockpit and the engine? If so, kinda scary.


I think that is pretty much how all new cars are going.
 
The above statements are true about switching to neutral in a MECHANICAL transmission.

Most of the Hybrids have ELECTRONIC transmissions.... so switching the lever to neutral may not always work if there is a hardware/software malfunction.


EDIT: Psychotronic nailed it. In the hybrids, the mechanical engine doesn't drive the cars.... it's a gas powered electrical power plant and the electricity is what drives the wheels. If the software locks up in the braking or transmission, then it won't work properly without a "reboot".
 
The above statements are true about switching to neutral in a MECHANICAL transmission.

Most of the Hybrids have ELECTRONIC transmissions.... so switching the lever to neutral may not always work if there is a hardware/software malfunction.


EDIT: Psychotronic nailed it. In the hybrids, the mechanical engine doesn't drive the cars.... it's a gas powered electrical power plant and the electricity is what drives the wheels. If the software locks up in the braking or transmission, then it won't work properly without a "reboot".

I don't think I EVER want a piece of software ultimately controlling a vehicle for me, unless I can instantly override it in some way.
 
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