Earlier quoted context omitted.
Depending on the drive trains being compared, the hybrid drivetrain may be overall mechanically simpler than an ICE. A series hybrid can easily have fewer moving parts, fewer friction spots, less reliance on fluid motion through little channels, etc. And then you're also keeping the moving parts more in their happy zone of temperature, speed, and load instead of needing them to operate in as wide of conditions.
Could you elaborate further? A hybrid, by definition, combines an ICE and electric drivetrain. While I understand it could be designed for a more efficient range of operation* how could it negate the downsides of an ICE-only design if it requires an ICE? (Are we conflating EV and hybrid?) * This also means each segment is less globally efficient, meaning the system is less efficient if it has to limp along if one par…
- pure ICE needs mechanical gears or a belt-style CVT. a HV power source and 2 electric motors enable the use of a dead simple planetary gear set to change the ratio between ICE and the wheels.
- ICE needs a starter and an alternator. psd hybrids use the existing electric motors and a dc-dc converter to do those jobs
- belt powered components (e.g. A/C, power steering) are replaced by more reliable electric versions powered by the high voltage battery
- ICE needs small displacement, high compression, turbo'd engines to meet power and efficiency targets. Hybrids can get away with wheezy but efficient and reliable low-compression engines because the electric motors make performance acceptable
- ICE cars need to run their engine anytime they are moving. Hybrids will have 20+% lower runtime and that runtime will be spent at optimal RPMs and with minimal stress as bursts in acceleration are assisted by the electric motor.