Quote:
Originally Posted by JSH
What engine? That is a key piece of information you left out of your original post. What type of vehicle are you attempting to hybridize?
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I would think a system like this would be most advantageous for 4-cylinder vehicles. Anything bigger would see negligible benefits from the assist. Maybe an utterly torque-less V6 might see a benefit, but generally speaking, the more low-end grunt the engine had, the less benefit the assist would give.
I've instrumented my grandparents' Accord to find out load patterns. Normal city acceleration is around 70-80% calculated load, and highway cruising is about 50-70% but rapidly spikes to near 100 climbing even a slight hill in top gear. I figured about 50% would be a good point to begin assisting, maybe biasing that up based on speed so I don't drain the entire battery cruising on the highway. Re-gen would be based on DFCO status, again maybe biased based on speed.
As for your point on start-stop, we need to move on from idling. I'm honestly puzzled why start-stop isn't mandatory (it's 2022.) It isn't just advantageous for FE, the lack of vibration, emissions, and noise is a great thing.