Sudden Burst of Speed

[goingreen23]

Originally Posted by ksstathead

What was your speed before and after this acceleration? Any chance you mean that you felt a surge as when regen is cancelled but the car did not actually speed up?

was stopping because of the red light... i don't think so it was really strange and it happened twice on the same intersection(spot).

[MikeDS]

I don't know about you guys, but I don't think my Prius has had a burst of speed intended or not...more like a lazy inclination to proceed forward...haha

[xpcman]

Originally Posted by goingreen23

I'm one of the statistics. I was slowing down at an intersection and was applying the brakes, went over a pothole and the car just accelerated with my foot still on the brakes lightly. Weird and scary though.

I had the exact same problem.

[goingreen23]

sudden acceleration happened to me again.

[a priori]

Originally Posted by goingreen23

sudden acceleration happened to me again.

Was this at the same intersection? Going the same speed?

[patsparks]

Originally Posted by goingreen23

sudden acceleration happened to me again.

That happens to me every time the light turns green.

[goingreen23]

Originally Posted by a priori

Was this at the same intersection? Going the same speed?

a different intersection, hit a bump on the road and as i was slowing down with my foot on the brake pedal it just accelerated a split second.

[qbee42]

Originally Posted by goingreen23

a different intersection, hit a bump on the road and as i was slowing down with my foot on the brake pedal it just accelerated a split second.

It doesn't accelerate in this situation. Simply put, the deceleration lowers or stops for a split second, which feels like forward acceleration. Humans have an amazing ability to establish baselines and notice any difference. In this case you adjust to the feeling of deceleration. When it drops or stops, it feels the same as accelerating in the forward direction, even though your speed doesn't increase.

Tom

[RickFlashman]

Originally Posted by qbee42

It doesn't accelerate in this situation. Simply put, the deceleration lowers or stops for a split second, which feels like forward acceleration. Humans have an amazing ability to establish baselines and notice any difference. In this case you adjust to the feeling of deceleration. When it drops or stops, it feels the same as accelerating in the forward direction, even though your speed doesn't increase.

Tom

Guys, everyone seeing this issue, read this. It's accurate. It covers every single instance reported in this thread. Thanks Tom.

[rachaelseven]

Yup. It is "sudden loss of expected deceleration", not actually "sudden acceleration". It is nevertheless highly disconcerting and more than a little disappointing. It feels like a sudden jump forward and it freaks out every single driver to whom it happens. Call me a concern troll if you'd like, but I don't see how a behavior that freaks out every driver of the car can be considered ok. I'm amazed this behavior has managed to survive so long without being changed. I won't trade my car over it - I love my Prius - but it still stops my heart every time it happens and I sure wish it would quit doing it.