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> Notice there are basically no diesel hybrids, this is because a diesel engine is more efficient than... Thx for the nice explanations. About diesel engines

> Notice there are basically no diesel hybrids, this is because a diesel engine is more efficient than... Thx for the nice explanations. About diesel engines I read long time back that it's as well because they need to be "hot" in order to be able to filter their exhaust fumes (don't know how to say this correctly - the thing that is done by the catalyzer in the exhaust pipe) => as a hybrid engine is meant to be switched off quite often, the catalyzer of a diesel engine would have to be kept very hot by the battery, reducing therefore range/effectiveness/etc... of the hybrid system.

SigmundA 6y ago
Hard to say with modern diesels but I am sure it does contribute to the cost benefit, DPF filters will need more regeneration (and fuel use) if the exhaust temps are not high enough which is typical of diesel used for short trips vs longer highway trips.
nanomonkey 6y ago
The term that you are looking for is "wet stacking", and is due to the fact that diesels utilize the heat and pressure in the pistons and cylinder walls to induce combustion (there is no spark plug). That being said, one could inject the bare minimum to "idle" the motor and maintain this temperature, losing a bit of efficiency from completely stopping the motor entirely. There are a few diesel hybrid prototypes, if memory serves me there was a two stroke diesel hybrid motorcycle called the eCycle that got something like 160mpg.