What sets a plug-in hybrid apart from a conventional full hybrid?
- A smaller engine with no starter motor
- A 48 V system in place of a high-voltage one
- A larger battery that charges from the grid
- A motor that cannot drive the wheels
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C. A larger battery that charges from the grid
A plug-in carries a bigger pack and a charge port so it can cover meaningful distance on grid electricity. A normal hybrid recharges only from the engine and braking.
Reference: Vehicle electrification types
A mild hybrid typically cannot:
- Shut the engine off at a stop
- Recover energy while braking
- Assist the engine with torque
- Drive on electric power alone
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D. Drive on electric power alone
A mild hybrid's motor helps the engine, restarts it and recovers some braking energy, but it is too small to move the car by itself. Full hybrids can drive electrically.
Reference: Vehicle electrification types
What mechanical device blends engine and motor power in a power-split hybrid?
- A torque converter
- A planetary gearset
- A steel push belt
- A dual-clutch pack
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B. A planetary gearset
A planetary gearset joins the engine and two motor-generators so engine power can be divided between the wheels and a generator. Belt CVTs change ratio with pulleys, which this design does not have.
Reference: Power-split transaxle operation