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Subject: Re: CAN Protocol and SAE J1850 Bus Interface Circuit
X-Newsreader: Microsoft Outlook Express 6.00.2600.0000
Date: Mon, 11 Nov 2002 08:03:20 -0800
NNTP-Posting-Date: Mon, 11 Nov 2002 08:00:58 MET
Organization: @Home Network
"Amy" wrote in message
> Thanks for all the suggestions! I need to get speed information
> directly from the bus because the pulse information from the vehicle
> speed sensor could be increased if a pulse generator (something like a
> timer) were connected.
> Imagine the scenarion when a car is running, would I be able to get
> speed info without sending a request as
> 1) the speed is changing at every instant (so it got sent out
> voluntarily) or
> 2) the dashboard requests the speed information to show it on the
> speedometer (dashboard initiated the request)?
> Thanks a lot again for your help!
> garwood wrote in message
> > why don't you try to go to the vss (vehicle speed sensor) typical 4000
> > or 8000 pulses per mile. you can calibrate pulses per time get speed.
> > gary
There are modules that convert speed info on the CAN bus to a regular pulse
train. Don't have a pointer though...
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