As a new TCH owner I'm enjoying the differences from driving my Maxima, especially at the gas pump. I'll get to the point
When I come to a stop I hear a Whirrrr that seems to be the CVT resetting itself back to "low" or first gear if it had one. This sound does not coincide with the regen brakes, in fact comes when the car is almost stopped. Am I guessing correcctly?
I get that too. It sounds like a servo or pump. Does the sound you hear come on for like 3 seconds and then click off?
The TCH has some additional hardware that makes different sounds. After I park my car, I can sometimes hear my car doing things up to 20 seconds later as well. I haven't done any research on these sounds, but they sound very normal to me (no grinding or scary noises). I think the vehicle does "maintenance" or calibration on itself after each trip.
As a new hybrid owner, you will hear lots of new whirrs, bells, and whistles, as the HSD resets itself and shuts down. In fact, your HSD will make a whole bunch of clicks as it shuts itself down about 5 minutes after you power off the car. The whirr that you hear while slowing down is related to the regen braking, as well as the CVT lowering the gear ratio as the speed decreases.
Yah. Sounds like the CVT changing gear ratios. Sure wish I could see a drawing of the inside of the CVT, it must be verrrry interesting.
Check out this thread with great links. The eahart link has a cool PDS (power splitting device) demo which explains why the car can only go 42 miles per hour under EV only:
Sounds like regen braking and the CVT to me, as flopshot said. My FEH does the same thing, as well as a high pitched fairly quiet (can't hear it with radio on) generator hum when I'm in electric-only mode. It's slightly audible outside the vehicle, as well, particularly when coming off a stop.
In other words, normal operating feature, not a bug.
Whirrrring sound comming to a stop.
Re: Whirrrring sound comming to a stop.
Re: Whirrrring sound comming to a stop.
