Electronic format of speed transfer to info pannel

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arvinfx
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Joined: 26 Aug 2010, 18:20

Electronic format of speed transfer to info pannel

Post by arvinfx » 26 Aug 2010, 18:31

Hi, I am electronic student and i must build digital speedometer engine evolution for my 405 and i need real format of upper variables where sent from ecu to front panel pointers.

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spider
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Electronic format of speed transfer to info pannel

Post by spider » 26 Aug 2010, 20:06

Hi.

As far as I am aware, the only speed sensor reading will be from the ABS sensors (one per wheel) , the speedometer itself is mechanical (cable driven) straight from the gearbox.

arvinfx
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Joined: 26 Aug 2010, 18:20

Electronic format of speed transfer to info pannel

Post by arvinfx » 27 Aug 2010, 07:07

spider wrote:Hi.

As far as I am aware, the only speed sensor reading will be from the ABS sensors (one per wheel) , the speedometer itself is mechanical (cable driven) straight from the gearbox.
Hi spider,

I should now about protocol of data transfer from (ecu) to (front panel pointer) , i never need mechanical information.

pug_owner2002
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Joined: 27 Feb 2005, 22:05

Electronic format of speed transfer to info pannel

Post by pug_owner2002 » 27 Aug 2010, 07:20

After reading this post a couple of times, I think that the OP is talking about a rev counter.

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spider
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Electronic format of speed transfer to info pannel

Post by spider » 27 Aug 2010, 11:42

Ah.

There's a sensor fitted to above the gearbox, I think it is just a hall effect sensor :?: , and this picks up a tiny, tiny voltage induced by the flywheel.

There is an amplifier for it in the instrument panel itself from what I remember.

arvinfx
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Joined: 26 Aug 2010, 18:20

Electronic format of speed transfer to info pannel

Post by arvinfx » 29 Aug 2010, 14:04

There is no need to read data from sensors the ecu support it.

I test pulse from ecu to front pannel and this result become.

engine evolution=(ECU Pulse ) * 30
e.g= 133 pulses we give from ecu in 1 sec
engine evolution= 133 * 30 = 3990 RPM


speed = (ECU Pulse ) * 0.8
e.g = when we give 130 pulse in 1 sec
speed= 120* 0.8 = 100 Km/h



:wink:

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Xaccers
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Electronic format of speed transfer to info pannel

Post by Xaccers » 29 Aug 2010, 16:40

going off topic, you can't get us some good photos of the latest Saipa Xantia can you? :)