I noticed a series of e-mails on regen and smart cruise control. These two topic are closely related. I have been looking at implementing regen on an AC motor controller. I found that designing an AC motor controller in simple comparison to selecting the best regen implementation. There are two typical methods for regen. If you release the accelerator then start regen. If you depress the brake then start regen. Tesla and Nissan use the first method. Some other companies use the brake depress method. The main advantages of the release accelerator method is fewer components and it is simpler. The disadvantage is with cruise control and down hill and then up hill. For in town cruise control, it works OK. The brake depress method solves the down hill/up hill problem; however, you do not get as much regen capacity because at some point the mechanical brake must be enabled. Added to the complication is the sequence of firing or not firing of the IGBTs. There are numer ous technical articles is the SAE journals and electrical journals proposing IGBT firing sequences that produce better regen. All manufactures are trying to extend the range of their vehicles. At present, improvements in inverter and component design provide less than a percent or two of efficiency improvement. Regen is a hot topic because a good regen implementation could add 10 plus percent in range. At present, recoverable energy from regen in 20 - 30 %. A smart system that could use GPS data, road map data, traffic light data and AI programming could recover a huge amount of energy. If you check current technical literature, you find that car manufacturers are working on this type of system. I am interested in is what current EV do? Is fully charging a battery not allowed so that regen can always happen? Is regen modified when the brake paddle is depressed? Under what situations is regen disabled? Do all EV have a regen disabled light? Do all EV have a regen d isable switch? Which EVs only use release of accelerator method? Does regen adaptive based on similar trips? The questions are numerous.
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