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Post by richard on Apr 8, 2019 18:08:52 GMT
As far as I'm aware, the 25's Streetdecks are micro-hybrids I thought they was full on hybrids. The WHs on the 25 sound the same as Arriva's HW100
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Post by 15002 on Apr 8, 2019 18:11:14 GMT
No, micro hybrids. The hybrid system is much smaller and is primarily used to power auxilaries (the electric items, eg lights, fans, blind motors, etc) by using braking energy (which would otherwise be wasted as heat in friction brakes) to power alternator to charge up small electric storage device (batteries or capacitors). Some can use some of this stored energy to give a short boost to the drivetrain during acceleration, as there is an electric motor (the same one that is used as an alternator during braking, by electrically switching its circuits). This boost is quite short (something like 20 seconds max) Micro hybrids are basically diesel buses, the diesel fuel saving is nearer 6-11% (depending on how frequent braking and acceleration is) whereas a full hybrid saves about 24-30% fuel compared to a normal full diesel The 25 has Streetdeck HEV96’s which are full hybrids. They have the capability of reverting back to micro hybrids if there is a fault with the EV system. That’s genuinely what I thought too. The 25 being a full hybrid due to the 96 Volt and the 44 being a micro hybrid.
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Post by Nathan on Apr 8, 2019 18:54:40 GMT
Looking at this quote from RouteOne magazine It's 96 Volts, this is the standard Voltage for most full Hybrids. The HEV96 buses are said to be significantly cheaper, although Wright seem to not want to tell anyone how they actually work. The last time we heard significantly cheaper was when ADL release their Smart Hybrids. The second part of the quote says that it has Micro Hybrid technology So talk about speculation! From what I understand, going off RouteOne's article, the Streetdeck HEV-96 utilises a parallel hybrid drivetrain, that can also utilise micro hybrid technology if there should be a fault with the HEV-96 system. “HEV-96 is a parallel hybrid system available in the StreetDeck and StreetLite. Two 75kW motor-generators are attached to opposite sides of the gearbox output shaft. They remove load from the engine when the bus starts from stationary,” “A further benefit is that if there is a fault with HEV-96, the bus can still be driven and complete its day’s work. It returns to being Micro Hybrid only,” Here's a link to the article, that gives a more in depth explanation. www.route-one.net/articles/Wrightbus_demonstrates_buses__fuel_saving_potential. The article in the link doesn't seem to be showing properly. EDIT: Seems to be working on the desktop, just not via a mobile browser
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Post by Londonbuses54 on Apr 8, 2019 20:35:19 GMT
Just something about proper hybrids, why does the generator rev up sometimes whilst regenerative braking is taking place?
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Post by rhys on Apr 8, 2019 21:22:38 GMT
Just something about proper hybrids, why does the generator rev up sometimes whilst regenerative braking is taking place? It's actually not the generator reving up, but the engine motor. Take the NRM for example, a series hybrid, the NRM not only uses regenerative braking to help charge the battery up, it also uses energy from the engine motor to help charge it up too. The NRM unlike most other series hybrids have the ability to run in full EV mode as well, providing there is enough charge. Most other full hybrids only have the ability to travel at low speeds in full EV mode, before the diesel kicks in. The E400H, also a series hybrid, works in a similar way to the NRM, where the engine motor is also helping to assist with charging the battery.
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Post by Frenzie on Apr 9, 2019 1:30:38 GMT
Just something about proper hybrids, why does the generator rev up sometimes whilst regenerative braking is taking place? It's actually not the generator reving up, but the engine motor. Take the NRM for example, a series hybrid, the NRM not only uses regenerative braking to help charge the battery up, it also uses energy from the engine motor to help charge it up too. The NRM unlike most other series hybrids have the ability to run in full EV mode as well, providing there is enough charge. Most other full hybrids only have the ability to travel at low speeds in full EV mode, before the diesel kicks in. The E400H, also a series hybrid, works in a similar way to the NRM, where the engine motor is also helping to assist with charging the battery. Currently on an NRM and it was in EV mode for quite a while which I thought was weird so thanks for explaining it!
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Post by Londonbuses54 on Apr 9, 2019 6:58:54 GMT
Just something about proper hybrids, why does the generator rev up sometimes whilst regenerative braking is taking place? It's actually not the generator reving up, but the engine motor. Take the NRM for example, a series hybrid, the NRM not only uses regenerative braking to help charge the battery up, it also uses energy from the engine motor to help charge it up too. The NRM unlike most other series hybrids have the ability to run in full EV mode as well, providing there is enough charge. Most other full hybrids only have the ability to travel at low speeds in full EV mode, before the diesel kicks in. The E400H, also a series hybrid, works in a similar way to the NRM, where the engine motor is also helping to assist with charging the battery. Thanks one thing. Why does it rev up whilst braking, and not while idling for example?
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Post by snowman on May 28, 2019 9:18:13 GMT
ADL have produced a new summary leaflet which should give outline as to the various types and some recent innovations ADL leaflet May 2019 Link
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