Battery Charge Stacking while Parked

Pollution control?

 

how does this thread 'stack up' against markabele's thread on losing charge while sitting?

 

i believe mark's was dropping while the ice was on.

 

interesting! why is that?

 

now i have to go back to his thread to find out if his charge was above 75%.

 

This situation is one in which my 'heater in a box' would be of help, I think. Two AC heaters running at 400 watts could maintain cabin temp in a non-moving car, I think.

 

It was much less than 75% SOC. And yes, the range kept dropping while ICE was running (while sitting).

 

so you and californiabear are having the opposite experience?

 

And USB backed it up with real data from Torque.

 

It depends on battery SOC. If it is above the comfortable level (70%?), ICE will not charge the battery (very little gas just to idle).

If SOC is below that threshold, ICE will run at higher load and extra juice goes into battery.

I believe this is the reason why warm ups in EV mode (normally above threshold) takes longer than if PiP warm up in HV mode (no EV miles left).

 

i think this is what markabele is protesting in his thread.

 

My understanding was that, his case was above the "comfortable" threshold. So ICE just idle to generate heat for cabin.

His EV miles decreased because 500-700 watts (normal load) were consumed by car electronics (in Ready state). It would happen anyway if ICE and cabin heater were off.

He started the thread because he thought ICE would generate electricity whenever it is on. Turns out, not the case.

 

see his post #30 here. perhaps i'm mistaken, i'll let him respond.

 

We'll have to narrow down to what SOC (or other conditions?) that changes the behavior.

 

You are correct.

ICE was warm, I was well below 70%. Like you said, the ICE is running so low/efficiently that there just really isn't much there to charge with.

 

if heat is a natural product of the combustion process, where does the rest of the energy go created by an idling engine?

 

Perhaps, It goes to maintain idling rev of the ICE.

The same as manual tranny car idling unclutched at stop light.

I visualize MG1 freely spinning as well. If there is a need for electricity, MG1 would create resistence to generate electricity. That would also put more load on the ICE and it'll use more gas to maintain idling.

Would it be efficient? No, but it assigns more role to the existing hardware (ICE being heater). That helps reduce the overall weight and cost which in turn gain more opportunities for higher efficiency at other times. I see it as give and take balancing act, weighted by the frequency.