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European Vs. North American Hybrids
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<blockquote data-quote="trainsboy335" data-source="post: 136349" data-attributes="member: 5165"><p>Thanks for your post! It's really interesting! The bus I'm referring to is the Gillig 35ft Hybrid with an Allison EP40 (now H 40 EP) Split parallel-series hybrid system. I've always been told that the engine revving while braking is to help recharge the batteries however I wouldn't be surprised if it was a similar system to a locomotive engine and dynamic braking. When I take my foot off the gas or the amount of pressure I'm applying to the gas peddle is not sufficient to continue accelerating, the bus' computer flips a switch and activates regenerative braking to help slow the bus down (and let me tell you, it really slows the bus down). However, that being said, I have noticed that when the engine revs while braking, it begins slowing down even faster; even though the engine has been uncoupled from the drive shaft. I could potentially attribute this to the engine doing one or both of two things: 1.) helping to recharge the batteries after a large drain from accelerating; and 2.) braking taking the form of rheostatic braking, i.e., generating more electricity than the resistors can handle to place additional resistance on the electric motor. That's just my theory though. Here is a link to the product page for the Allison H 40 EP : <a href="https://www.allisontransmission.com/docs/default-source/marketing-materials/sa5983en-h40-50-ep1BCB31AC06C2F2B94ACCEED0.pdf?sfvrsn=4" target="_blank">Link</a></p></blockquote><p></p>
[QUOTE="trainsboy335, post: 136349, member: 5165"] Thanks for your post! It's really interesting! The bus I'm referring to is the Gillig 35ft Hybrid with an Allison EP40 (now H 40 EP) Split parallel-series hybrid system. I've always been told that the engine revving while braking is to help recharge the batteries however I wouldn't be surprised if it was a similar system to a locomotive engine and dynamic braking. When I take my foot off the gas or the amount of pressure I'm applying to the gas peddle is not sufficient to continue accelerating, the bus' computer flips a switch and activates regenerative braking to help slow the bus down (and let me tell you, it really slows the bus down). However, that being said, I have noticed that when the engine revs while braking, it begins slowing down even faster; even though the engine has been uncoupled from the drive shaft. I could potentially attribute this to the engine doing one or both of two things: 1.) helping to recharge the batteries after a large drain from accelerating; and 2.) braking taking the form of rheostatic braking, i.e., generating more electricity than the resistors can handle to place additional resistance on the electric motor. That's just my theory though. Here is a link to the product page for the Allison H 40 EP : [URL='https://www.allisontransmission.com/docs/default-source/marketing-materials/sa5983en-h40-50-ep1BCB31AC06C2F2B94ACCEED0.pdf?sfvrsn=4']Link[/URL] [/QUOTE]
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