Quote:
Originally Posted by WebG
When rolling downhill, you're saying I should shift into neutral. When I reach the bottom of the hill and need to accellerate upwards, what type of engine reaction time should I worry about with regards to timing the shift back into drive and then pressing the accellerator?
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One thing to think about -- be somewhat mindful of your speed when you put the HiHy back into "D". At speed above around 60 with the engine shut down, there are some pretty radical things that could happen as a result of the ECU trying to get control of the ICE RPM to MG1 relationship.
If you are going downhill in a normal coast in "D" at these higher speeds, the engine may not be shut off (RPM 0), but rather is in fuel cut-off. This is done to avoid overspeeding MG1 (in the case of my Camery, it may be different in the HiHy 4WD because of the twin tranction MG arrangement). But the principle in the HiHy is the same. By putting the car in "N" and building up a high speed, you
may have taken away the ability of the ECU to control the ICE/MG1 ratio (it may not shut down the engine in these cases anyway, but I don't know that for sure). If the engine does, in fact shut down to zero RPM in 'N" there could be some nasty mechanical forces when you shift to "D" and the ECU asserts control of MG1.
Some further discussion of that in the latter parts of this thread =
http://www.greenhybrid.com/discuss/s...t=14215&page=6