Quote:
Originally Posted by ken1784
Prius ICE shuts off when coasting in Stage 2.
Does the TCH act differently?
Ken@Japan
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Ken, my TCH will not shut off the ICE when coasting in Stage 2, regardless of the speed.
Regarding Stage 4: slowing down below 40 miles per hour simply stops the ICE when in Stage 3 and does not enter Stage 4. The transition from Stage 3 to Stage 4 only occurs if the ICE is running when stopped. (I also have seen it transition in creeping traffic when going < 5 miles per hour for about 10 seconds)
Another interesting observation is it is possible to go directly from Stage 1 to Stage 4 when restarting with a warmed up engine! It takes a little practice, but can be done consistently. The key is to pay attention to the battery assist/ICE rpms during Stage 1. As soon as the rpms rise, the TCH has left Stage 1. If you coast immediately the ICE will stop and viola! Stage 4.
On my way home I often combine trips and stop now and then. When I get back in the TCH, I gently accelerate until I notice the ICE rpm increase, then coast and smile as the ICE stops and I'm now in Stage 4.
Typically Stage 1 on a warm start runs about 20 seconds or so. During Stage 1 acceleration is primarily from the battery, as the ICE runs at a rather constant rpm. Once Stage 1 ends, the extra battery assist stops and the ICE rpm increases to pick up the load.
Quote:
- Stage 4 is full hybrid mode. Enter it by braking to a complete stop with the ICE running and wait to see if that the engine shuts off after 7 to 10 seconds. (((Doesn't slowing from below 40 miles per hour accomplish the same??))) It is hard to know if this ICE shutdown is due to stage 3 or entering stage 4. The only way I know is to accelerate to ~20mph and coast.
If the ICE...- ...continues to run after you stop the car, it is still in stage 3.
- ...stops within a few seconds the car is in stage 4.
In stop and go traffic, stage 4 lets the ICE stop any time you coast, instead of having to be over 35mph when coasting. If the ICE is running, turn off the heat and the ICE turns off, you'll know that you are in stage 4.
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