MPG on first-start electric
#11
Re: MPG on first-start electric
Something else unusual happened this morning. I was at full warm up (having driven for 15 minutes), HWT at around 160, sitting at a stop with the engine off, waiting for a stop light. When I accelerated, the FEH went into the "early morning cold start" mode for about 15 seconds - the engine went to about 1550 RPMs and the TPS stayed at 17, regardless of how hard I used the pedal (within reason, of course). After about 15 seconds it reverted to normal operation.
I sure wish I could figure out what enabled this behavior - I could use it to accelerate to cruising speed on a regular basis. I think I may have stumbled on a programming quirk in the FEH computer module. Of course it may only occur at certain environmental levels - it was damp this AM due to rain, for example, and about 55 degrees.
I sure wish I could figure out what enabled this behavior - I could use it to accelerate to cruising speed on a regular basis. I think I may have stumbled on a programming quirk in the FEH computer module. Of course it may only occur at certain environmental levels - it was damp this AM due to rain, for example, and about 55 degrees.
#12
Re: MPG on first-start electric
I posted about something similar last summer; I called it drive-thru warm-up mode because it happened several times while waiting in a Sonic drive-thru. Temps in the 90's, FEH well warmed up, I would shift into N and then back to D to creep forward as the line moved. By the time I got to the window, SoC was low so I left it in N to keep the ICE off in case the SoC dropped below 40%. After shifting into D and driving away, car was in warm-up mode, but stayed there for more like 20 or 30 seconds. One time when I accelerated fairly quickly up to 45MPH (in a 40 zone, to avoid being rear-ended) the SoC dropped all the way to 31.3% before the warm-up mode ended.
Why were you shifting into "N" and then "D"? If the engine is off and SOC is OK, why not just leave it in "D"?
#14
Re: MPG on first-start electric
If in D, and the engine cools below a setpoint, the engine will come back on just to make heat. Sounds stupid. But it's for emissions reasons.
#15
Re: MPG on first-start electric
On a side note, I haven't been able to reproduce the "hot engine" startup.
However, I did notice that the TPS does not settle in on a level for several seconds. I would have expected it to find a TPS and stay there immediately, instead it goes up from 11 to 16, 17,18, or whatever - and then settles down between 16 - 18 TPS.
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