Deleted
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Post by Deleted on Dec 11, 2013 18:43:52 GMT
Hi All
What is bus kickdown ?
Do buses have a switch under pedals to unrestrict them or to enable more power?
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Deleted
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Post by Deleted on Dec 11, 2013 19:07:10 GMT
It will be the same as kickdown in a automatic car ... if you push the accelerator hard to the floor the engine will downshift a gear, leading to higher revs but greater acceleration ... it also uses more fuel.
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Post by jay38a on Dec 11, 2013 19:11:48 GMT
Some buses have a switch below the accelerator like Euro 3 Darts to enable kickdown, but others its done by the accelerator such as earlier versions of e200s and all Scanias.
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Post by moz on Dec 11, 2013 19:35:34 GMT
Some buses have a switch below the accelerator like Euro 3 Darts to enable kickdown, but others its done by the accelerator such as earlier versions of e200s and all Scanias. Not modern really, Metrobuses had a similar system! Moz |
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Post by M1104 on Dec 11, 2013 21:39:33 GMT
It will be the same as kickdown in a automatic car ... if you push the accelerator hard to the floor the engine will downshift a gear, leading to higher revs but greater acceleration ... it also uses more fuel. The kickdown can also delay the change up to the next gear, pushing the engine closer to its maximum revvs. |
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Post by M1199 on Dec 11, 2013 21:48:19 GMT
Some buses have a switch below the accelerator like Euro 3 Darts to enable kickdown, but others its done by the accelerator such as earlier versions of e200s and all Scanias. Not modern really, Metrobuses had a similar system! Moz Talking of Metrobuses and kickdown, I got some of that on Saturday aboard M1 at the Ensignbus running day. youtu.be/qPwvHACXVeA?t=14s At about 25 seconds in. |
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Post by 6HP502C on Dec 11, 2013 22:09:51 GMT
On the majority of buses I have driven, the pedal doesn't have to be fully depressed to get kickdown - in most cases it will activate without the need to press down the switch under the pedal.
I drove VA78 once - the kickdown was active but there was no switch at all under the pedal, whereas Abellio's kickdown enabled Volvos do have a switch under the pedal.
I also use the gearhold buttons where they're available. They will often trigger a downshift at revs where having the throttle fully depressed doesn't.
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Post by M1104 on Dec 12, 2013 9:50:45 GMT
On the majority of buses I have driven, the pedal doesn't have to be fully depressed to get kickdown - in most cases it will activate without the need to press down the switch under the pedal. Those buses would have kickdown sensors that activate based on the position of the throttle, sort of like the throttle position sensor if not the same thing. I believe all B7TLs with the new style dash (and all subsequent B9TLs) have this sensor, most of which have been deactivated and are hence stuck on intelligence mode where the ECU decides when the bus needs to gearhold or downshift. The B7TLs prior to 05 reg are mostly button activated, unless they have been sensor retrofitted. I am not sure about the three speed Voith variant as I have never known a particular one with a 'proper' working function. I suspect nevertheless that they can work but were just never configured to do so....pity!!!  |
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Post by capitalomnibus on Feb 12, 2015 1:57:59 GMT
On the majority of buses I have driven, the pedal doesn't have to be fully depressed to get kickdown - in most cases it will activate without the need to press down the switch under the pedal. Those buses would have kickdown sensors that activate based on the position of the throttle, sort of like the throttle position sensor if not the same thing. I believe all B7TLs with the new style dash (and all subsequent B9TLs) have this sensor, most of which have been deactivated and are hence stuck on intelligence mode where the ECU decides when the bus needs to gearhold or downshift. The B7TLs prior to 05 reg are mostly button activated, unless they have been sensor retrofitted. I am not sure about the three speed Voith variant as I have never known a particular one with a 'proper' working function. I suspect nevertheless that they can work but were just never configured to do so....pity!!! Early B7TL's has an easy to remove pedal assembly unit. This has combined kickdown switch and the throttle position sensor mounted onto the side of the pedal. A few companies have changed them to the aftermarket version which is similar to newer ones which has a different throttle position sensor that works with the gearbox to determine gradient level to adjust maximum engine speed. The newer assembly does not have a kickdown switch and has a moulded pedal stop to prevent further travel within the kickdown region. |
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