|
Post by rhys on Apr 25, 2019 18:12:00 GMT
There's a reason for this, but it's a bit complicated. The battery in a Hybrid is partially recharged when the driver slows down or brakes. ... (However, that's usually not enough to keep the battery fully charged, so the engine can also turn the generator under cruise conditions when it's mostly just loafing along.) SOURCE GOOGLE Did it mention why it revs up? They use regenerative braking every single time, but only rev up when they are going very quickly and brake fairly sharply The reving from the engine also helps to assist recharging of the battery a lot quicker. Obviously, whilst the bus is going really fast or is braking rapidly, not enough charge is being generated from regenerative braking. This is exactly why assistance is needed from the engine motor, and hence why you can hear it reving a lot faster at times.
|
|
|
Post by Londonbuses54 on Apr 25, 2019 18:35:16 GMT
Did it mention why it revs up? They use regenerative braking every single time, but only rev up when they are going very quickly and brake fairly sharply The reving from the engine also helps to assist recharging of the battery a lot quicker. Obviously, whilst the bus is going really fast or is braking rapidly, not enough charge is being generated from regenerative braking. This is exactly why assistance is needed from the engine motor, and hence why you can hear it reving a lot faster at times. So effectively it just needs that extra boost of charge after it’s been spending most of it gaining the high speed it has, whereas on normal acceleration and city speed, the battery hasn’t drained as much?
|
|
|
Post by rhys on Apr 25, 2019 19:17:17 GMT
The reving from the engine also helps to assist recharging of the battery a lot quicker. Obviously, whilst the bus is going really fast or is braking rapidly, not enough charge is being generated from regenerative braking. This is exactly why assistance is needed from the engine motor, and hence why you can hear it reving a lot faster at times. So effectively it just needs that extra boost of charge after it’s been spending most of it gaining the high speed it has, whereas on normal acceleration and city speed, the battery hasn’t drained as much? Nope, not necessarily. As a bus would use a lot of battery power within the city, just from sitting around in traffic whilst in EV mode, hence why the engine may also sometimes come on whilst the bus is stationary. I imagine when the battery level gets below a certain percentage the engine will automatically kick in to give it that extra charging boost which isn't gained from regenerative braking.
|
|
|
Post by 6HP502C on Apr 25, 2019 22:25:37 GMT
The behaviour of the E400Hs changes as the batteries get older. Some of them rev in a frenzied manner when rolling along with the foot on neither pedal.
I drove Euro 5 stop starter 2442 last weekend and it revved up every single time I slowed down. Many Euro 5s at Walworth are, or were like this but some have had new batteries. The one I took out on Green Park to Acton Town was unable to rev up continuously and lost a lot of power as a result.
Some of the Euro 6 E400Hs are going the same way. Both Euro 5 and 6 examples have produced some pretty bizarre electrical faults.
The newer MMCs at Abellio at least don't rev up as much when braking. On light runs from Chingford to WL in the dead of night the only time they do it is when descending Blackheath Hill!
|
|
|
Post by busaholic on Apr 26, 2019 16:14:05 GMT
The behaviour of the E400Hs changes as the batteries get older. Some of them rev in a frenzied manner when rolling along with the foot on neither pedal. I drove Euro 5 stop starter 2442 last weekend and it revved up every single time I slowed down. Many Euro 5s at Walworth are, or were like this but some have had new batteries. The one I took out on Green Park to Acton Town was unable to rev up continuously and lost a lot of power as a result. Some of the Euro 6 E400Hs are going the same way. Both Euro 5 and 6 examples have produced some pretty bizarre electrical faults. The newer MMCs at Abellio at least don't rev up as much when braking. On light runs from Chingford to WL in the dead of night the only time they do it is when descending Blackheath Hill! I'm interested to know why/how Blackheath Hill is on that route: you're travelling via Dartford?
|
|
|
Post by redbus on Apr 26, 2019 16:20:24 GMT
The behaviour of the E400Hs changes as the batteries get older. Some of them rev in a frenzied manner when rolling along with the foot on neither pedal. I drove Euro 5 stop starter 2442 last weekend and it revved up every single time I slowed down. Many Euro 5s at Walworth are, or were like this but some have had new batteries. The one I took out on Green Park to Acton Town was unable to rev up continuously and lost a lot of power as a result. Some of the Euro 6 E400Hs are going the same way. Both Euro 5 and 6 examples have produced some pretty bizarre electrical faults. The newer MMCs at Abellio at least don't rev up as much when braking. On light runs from Chingford to WL in the dead of night the only time they do it is when descending Blackheath Hill! Think of the batteries on the hybrid like the one in your phone. As the battery ages it holds less charge, so it is going to need to be charged more often. In the case of the E400H I suspect that the battery is running down more quickly due to age and use, and so the rev you are hearing is to do with getting the battery charged by the engine.
|
|
|
Post by sid on Apr 26, 2019 16:38:31 GMT
The behaviour of the E400Hs changes as the batteries get older. Some of them rev in a frenzied manner when rolling along with the foot on neither pedal. I drove Euro 5 stop starter 2442 last weekend and it revved up every single time I slowed down. Many Euro 5s at Walworth are, or were like this but some have had new batteries. The one I took out on Green Park to Acton Town was unable to rev up continuously and lost a lot of power as a result. Some of the Euro 6 E400Hs are going the same way. Both Euro 5 and 6 examples have produced some pretty bizarre electrical faults. The newer MMCs at Abellio at least don't rev up as much when braking. On light runs from Chingford to WL in the dead of night the only time they do it is when descending Blackheath Hill! I'm interested to know why/how Blackheath Hill is on that route: you're travelling via Dartford? Presumably he used the Blackwall Tunnel and went via Blackheath Hill rather than go through Greenwich? That would be my guess anyway.
|
|
|
Post by gloriouswater on Apr 26, 2019 16:40:35 GMT
The behaviour of the E400Hs changes as the batteries get older. Some of them rev in a frenzied manner when rolling along with the foot on neither pedal. I drove Euro 5 stop starter 2442 last weekend and it revved up every single time I slowed down. Many Euro 5s at Walworth are, or were like this but some have had new batteries. The one I took out on Green Park to Acton Town was unable to rev up continuously and lost a lot of power as a result. Some of the Euro 6 E400Hs are going the same way. Both Euro 5 and 6 examples have produced some pretty bizarre electrical faults. The newer MMCs at Abellio at least don't rev up as much when braking. On light runs from Chingford to WL in the dead of night the only time they do it is when descending Blackheath Hill! I'm interested to know why/how Blackheath Hill is on that route: you're travelling via Dartford? I suspect he goes down through the Blackwall Tunnel - off the top of my head double deckers can fit through the southbound tunnel, but not the northbound one.
edit: should have looked before I hit post!
|
|
|
Post by busaholic on Apr 26, 2019 17:14:42 GMT
I'm interested to know why/how Blackheath Hill is on that route: you're travelling via Dartford? I suspect he goes down through the Blackwall Tunnel - off the top of my head double deckers can fit through the southbound tunnel, but not the northbound one.
edit: should have looked before I hit post! Well, I did wonder but, for some reason, thought they were banned. Were they at one time in the not-so-distant past?
|
|
|
Post by sid on Apr 26, 2019 17:31:16 GMT
I suspect he goes down through the Blackwall Tunnel - off the top of my head double deckers can fit through the southbound tunnel, but not the northbound one.
edit: should have looked before I hit post! Well, I did wonder but, for some reason, thought they were banned. Were they at one time in the not-so-distant past? No.
|
|
|
Post by 6HP502C on Apr 26, 2019 18:25:50 GMT
The behaviour of the E400Hs changes as the batteries get older. Some of them rev in a frenzied manner when rolling along with the foot on neither pedal. I drove Euro 5 stop starter 2442 last weekend and it revved up every single time I slowed down. Many Euro 5s at Walworth are, or were like this but some have had new batteries. The one I took out on Green Park to Acton Town was unable to rev up continuously and lost a lot of power as a result. Some of the Euro 6 E400Hs are going the same way. Both Euro 5 and 6 examples have produced some pretty bizarre electrical faults. The newer MMCs at Abellio at least don't rev up as much when braking. On light runs from Chingford to WL in the dead of night the only time they do it is when descending Blackheath Hill! I'm interested to know why/how Blackheath Hill is on that route: you're travelling via Dartford? I go via Woodford Green, Snaresbrook, that A12, A102 and A2 from Sun-in-the-Sands which goes straight to WL. It's the only way to do it in the generous(!) 40 minutes given!
|
|
|
Post by 6HP502C on Apr 26, 2019 18:29:01 GMT
I'm interested to know why/how Blackheath Hill is on that route: you're travelling via Dartford? I suspect he goes down through the Blackwall Tunnel - off the top of my head double deckers can fit through the southbound tunnel, but not the northbound one. edit: should have looked before I hit post! That is correct! Only use the nb tunnel on dead runs from WL to Stratford for the Richmond job!
|
|
|
Post by MetrolineGA1511 on Apr 27, 2019 4:09:47 GMT
Just wondering are there any routes you can never see leaving the opperator they are at. For me I would say all AF routes are safe excluding the 337, also think 16 at W is safe. I get the impression all AC routes other than the 260 are safe. The 53 is safe at PD. AC may have had a narrow escape not losing route 52 to TT (X). X had a Sunday allocation in the 80s. Space permitting, route 53 could return to LC (NX). It was all NX but was lost to PD in 3 stages between 1985 & 1993.
|
|
|
Post by kmkcheng on Apr 27, 2019 10:43:58 GMT
A question regarding the low emission bus zones. Does it only apply to buses in passenger service? As we have a garage like W which is in the Edgware Road bus zone but will have non-compliant buses like the TAs running light in and out of the garage to take up service on the 210 for example
|
|
|
Post by redexpress on Apr 27, 2019 10:57:03 GMT
A question regarding the low emission bus zones. Does it only apply to buses in passenger service? As we have a garage like W which is in the Edgware Road bus zone but will have non-compliant buses like the TAs running light in and out of the garage to take up service on the 210 for example Only applies to in-service buses. That's how non-compliant buses were still able to access AF when the first LEBZ was introduced on Putney High Street. As it happens AF's non-compliant buses (22 and 337 allocations) have since been upgraded to EuroVI anyway.
|
|