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 work at a car company, and getting clean diesel emissions is complicated. Between the sensors, computers, def system, and heat management, small car diesel engines are significantly more complex than standard turbocharged gas engines, which are almost as efficient and way cheaper to make. Combine that with the battery and other electric systems, and a hybrid diesel would be a nightmare to engineer and manufacture.

Diesels have advantages for heavy duty trucks and towing, so we still make plenty of them, but there really isn’t a market for a more expensive hybrid that would likely also break down more often.