Why are all modern hybrid and plug in hybrid cars paired with gas engines rather than diesel engines? The diesel and hybrid pair seem like a great idea in theory.

Question

A lot of people see hybrids and plug in hybrids as a great middle ground between ICE and EV, so why not make a diesel hybrid. They can be used in a variety of vehicles, and can reduce the nox and particulate emissions diesels are known for. So why isn’t there a modern diesel hybrid being produced, at least as a passenger car?

In: Engineering

Answer 1

I’m sure it’s possible, but hybrids are specifically paired with a type of engine called an “Atkinson cycle” engine. These are highly efficient on their own – which is why they can achieve 35+ mpg on the highway with gas, when the electric motor is not in use – but have poor “low-end” acceleration. They can’t start from a standstill very well, and that’s when the electric motor takes over.