EV question - uphill

1) either the hill caused the battery to overheat, or you hit the powerline for a millisecond without realizing it.
2) the ice had to warm up once it started, then you get ev back.

 

Once HV kicks in, you have two choices.

1) live with it until you reach 130°F, or;
2) pull over, turn off the engine, then start up again in EV

Hills play havoc with the EV system. Next time, before you hit the uphill, go into PWR mode and see if that helps. You should be able to move without pressing the pedal (and the EV motor) too far.

 

Depending on the battery SOC, temp and outside temp, you may not have full EV power.

When outside temp was 20 deg F, I only had about 20 hp before ICE kicking in. The lower the SOC, the more power available. A full battery is less tolerable for high discharge.

That's the nature of lithium battery.

 

I don't believe the PWR mode does anything besides change the "law" of the accelerator pedal, making it ask for more power at smaller depressions. Does any one have any evidence that is does anything else? In other words, I don't think the PWR mode changes the relationship between the power meter and the motor torque.

 

If your trip is going to require the ICE at sometime later you would be better off to go into HV for that hill and the warm up to 130 degrees. Save the EV miles for where they are more efficient. If its a short trip you will have to go a little slower up the hill to stay away from that milisecond of hitting the pwr area as described in another posting.

 

Yes. It is rarely a good idea to use EV on steep and/or long uphills. On downhills, however, switch to EV and let your range increase markedly.

 

That doesn't sound right. Typical Lithium-ion batteries can discharge higher power output at a high SOC but can take back in a lower power level during regen. The opposite is true at low SOC where a relatively high amount of regen power can be absorbed but the output power capability is reduced.

This is why the Tesla and LEAF etc. when near fully charged can run into regeneration limits when they are nearly fully charged even in pleasant temperatures. The Prius Plugin and other plugin hybrids like the Volt and etc. may face regen limits not primarily because of underlying battery limits but because their control software limits their SOC to be under 90% to enhance battery lifetime. The Prius may face these limitations more frequently because its smaller battery can reach its maximum SOC quicker during regen.

This is also why quick DC charging a Tesla or LEAF slows down the power as the battery gets over 80% SOC although there is no power limitation when flooring the go pedal on a fully range charged Model S (or LEAF).

The power output limitations you saw in the Prius Plugin on a fully charged battery were likely due only to cold temperatures.

 

Are you responding to me or to the original poster? It's true that a fully charged battery pack can't absorb more power.

 

Once its warmed up.. it will shut off quickly if that happens again.
If u get the throttle bar into pwr section during ev driving it will trigger the ice.. so avoid that if possible.

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