Curious about current flow while stopped
This would be a question for anyone with a NAV.
While driving into work this morning I took the back roads which has about 5 stop lights. While at one I became curious about current flow when stopped and in EV. Here are my observations:
-R |
Re: Curious about current flow while stopped
Originally Posted by rdinatal
(Post 120138)
Is there current flow to the drive motor when stopped and your foot on the brake?
-R There is at least some difference between N and D. First if you are at an intersection in N the car is NOT going to creep forward. There also appears to be less drag when going down an incline. |
Re: Curious about current flow while stopped
If the ICE is running when you stop the only way you can remain stationary is for the CVT motor to turn in a direction opposite THE ice and three times faster.
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Re: Curious about current flow while stopped
Originally Posted by wwest
(Post 120162)
If the ICE is running when you stop the only way you can remain stationary is for the CVT motor to turn in a direction opposite THE ice and three times faster.
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Re: Curious about current flow while stopped
Originally Posted by rdinatal
(Post 120138)
In fact there might not even be a brake light switch to turn on the lamps...you could just use the position of the pedal to turn the lights on, however I suspect they went with the simple tried and true brake light switch for that function. |
Re: Curious about current flow while stopped
TeeSter:
You are correct that I was asking while in EV mode. I respectfully disagree that the brake controls are entirely electronic. While some braking force is via the electronics and is controlled that way the "backup" is mechanical/hydraulics. There would be way to much liability to rely 100% on electronics. The technology isn't to that level yet. I'm just curious if the ecvt motor is powered while stopped (in EV mode) and the brakes are 100% engaged. Seems like a waste of energy or is it so small that the effort to keep it from being wasted is huge? -R |
Re: Curious about current flow while stopped
Originally Posted by rdinatal
(Post 120138)
With a regular vehicles, with a gas-only engine and an automatic transmission, the vehicle will creep forward as you release the brake pedal, and not yet touched the gas pedal. The hybrid attempts to simulate that. When you partially release the brake, it will sense that, and turn 'on' the electric motor to allow the hybrid to creep forward. |
Re: Curious about current flow while stopped
Originally Posted by TeeSter
(Post 120167)
Its important to note that since the brake controls are entirely electronic, there must be an electronic encoded signal for brake pedal position, so the brake light switch isn't the only indicator that can be used for determining if you've lifted your foot....
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Re: Curious about current flow while stopped
Originally Posted by rdinatal
(Post 120184)
TeeSter:
You are correct that I was asking while in EV mode. I respectfully disagree that the brake controls are entirely electronic. While some braking force is via the electronics and is controlled that way the "backup" is mechanical/hydraulics. There would be way to much liability to rely 100% on electronics. The technology isn't to that level yet. I'm just curious if the ecvt motor is powered while stopped (in EV mode) and the brakes are 100% engaged. Seems like a waste of energy or is it so small that the effort to keep it from being wasted is huge? -R Also.... unfortuantely the NAV doesn't seems to be accurate enough to answer your orginal question. I have the NAV and even when I'm crawling forward as you describe no current arrow appears to the motor. Clearly some current is flowing because the designers wanted to emulate the "idle creep" of a normal automatic, but its not enough for the NAV to register. |
Re: Curious about current flow while stopped
Originally Posted by TeeSter
(Post 120223)
SOMEWHERE there has to be a sensor... ie you could have a physical linkage to the brake pads (but posts seem to say there is not), ...
This might also be why the hybrids are the reverse of gas-only vehicles, in that hybrids wear out rear brakes faster than their fronts. |
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