why can’t we have diesel hybrids?
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Because petrol engines produce maximum torque at higher rpm, whereas diesel engines produce max torque at lower rpm. Therefore, when you pair an electric motor with a petrol engine they synergise well. The electric motor fills in the torque curve at low rpm and the petrol engine can take over at high rpm. Both systems work nice and smoothly together over the whole power band.
If you pair a diesel engine with an electric motor they are both producing huge torque at low rpm, which leaves a gap in the power band at high rpm. It’s just not an efficient use of both technologies. Modern engineering can mitigate this difference to a certain extent at the expense of cost and complexity, but generally it’s just not worth it.
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