You really can't compare the HEV and PHEV in this regard. Two completely different systems, and don't really have a lot of parallels. The HEV has no method of externally charging the battery, so naturally the engine is used if the SoC drops too low. With the PHEV, you do have the ability to charge externally, so the programming is completely different from the HEV. My battery will drop as low as 16% before the car will switch to HEV mode, and if I keep the pressure on the throttle pedal below a certain value the ICE will never fire up if the battery has a sufficient SoC, and I can easily reach freeway speeds. You can't do that with the HEV. The ICE will fire up with any acceleration beyond slowly driving around in a parking lot.
2019 Kia Niro PHEV EX Premium
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Last edited by atc98092; 09-09-2019 at 03:57 PM.
Reason: noticed a typo