[Ovmsdev] Roadster cooldown again
casner at acm.org
Thu Aug 1 00:24:12 HKT 2019
Thanks. I've changed the templimit to 30. The setting of 25 was
probably left over from the testing we were doing last winter.
On Wed, 31 Jul 2019, Mark Webb-Johnson wrote:
> The output looks correct. The car just only turned on the HVAC twice (2 cycles detected) in the hour.
> The behaviour of the VMS is pretty much voodoo in this. The cycling of RANGE/PERFORMANCE seems to work once every ten minutes or so for hot packs, but In your case it didn't seem to want to go below 30C. That is average temperature - perhaps the control is more on min/max brick temperature? The conjecture Is that too much / quick cooling would be a bad thing as it would cause condensation within the pack/
> Below 31C should be fine to turn off the little coolant pump.
> Regards, Mark.
> > On 31 Jul 2019, at 5:58 AM, Stephen Casner <casner at acm.org> wrote:
> > Today my coolant pump was running continuously even though the charge
> > level was only 55% and the ambient temperature was only 77F, although
> > the battery was at 89F (32C) left over from a drive last evening. So,
> > I decided to try cooldown again. The log is below.
> > This time the charge current was properly managed at 12A and Range
> > mode. The A/C fans came on soon after starting and the battery temp
> > was reduced from 32C to 30C in 3 minutes. However, after that the
> > temperature did not drop further, even though the templimit is
> > currently set to 25C, except for a brief period at 29C for 3 minutes
> > about halfway through the hour time limit before returning to 30C. I
> > didn't monitor the whole time, but I didn't notice the A/C fans on any
> > more. Does the Roadster not try to cool below 30C? Yet when we were
> > testing last winter while the ambient temperature was cooler, I was
> > able to set the templimit to 19C and the car did cool the battery from
> > 20C to 19C in the test. Perhaps the car's goal temperature is based
> > on some delta from the ambient temperature.
> > This time the session correctly did not turn into a regular charging
> > session after the cooldown time limit was reached, and the coolant
> > pump did stop running.
> > -- Steve
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