Is it possible for aog to take the prescribed speed from a raven rcm and use it to change the cruise control speed on a Fendt 936 SCR?
Sadly, AOG does not support cruise control.
A question out of curiosity, I thought rate controller would take the speed info from the tractor and adjust application rate accordingly. How does Raven rcm figure out the correct speed and does it use isobus TIM to control the tractor? I’m not aware of any other approach with commercial products.
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We run a drag line manure system. The flow is always constant, but we vary the speed of the tractor to adjust the rate per acre. I would like to find a way to adjust the tractor speed automatically. I figured it’s possible one way or the other through canbus.
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Sounds like something that could be done purely on the MCU side. Potentially triggered by work switch position or similar. Not sure if you could alter a cruise speed but maybe you could read actual speed from canbus then send a joystick push forwards or pull back to regulate speed? Potentially not possible if the stick sends a stream of centre position codes when not pushed in any direction.
Just a thought. Long time since I’ve coded Fendt canbus stuff to be fair, and I know nothing about the raven.
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To add to this, there is a speed output on the headlining plugs in the cab if a bus one isn’t available.
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I’ve searched through my old canbus stuff and found the list of can sniffed Fendt arm rest codes. Unfortunately I don’t know who to credit for this any more (Thomas Deistler?) but on that list there is indeed codes for both accelerate and decelerate. So this should be perfectly possible to implement in the MCU code. I used the small Go and END button codes to operate headland management in the code I wrote.
I assume the Raven thing carries and computes the application map and just sends a speed request?
The whole speed control system could be made completely separate to AOG apart from a section on/off trigger. Depending on which AOG board you are using, you may not even have enough canbus controllers to operate the Fendt Kbus anyway via the AOG board.
The raven is an isobus rate controller. It just shows a suggested speed for the operator to maintain.
Where do I buy one of the boards so I can do some canbus sniffing? I’m assuming I would need 2 canbus’ one for the kbus and one for the isobus.
How were you thinking of sending that suggested speed to AOG if it only shows a speed?
There’s quite a bit of info on canbus sniffing on the web and even here, but trying to extract it from the raven if it’s not specifically sending a usable speed output could be challenging at best!!
…or, does it actually send a speed request of some sort?
Not sure how you could send a speed command - maybe set a new value as held in C1, but thinking about it from a control point of view, you would do that by changing the value with a scroll wheel etc or tapping the monitor? Can you find the changing scroll-wheel code?
I would doubt there is any canbus data relating to the scroll wheel specifically as it’s only used to alter parameters local to the console itself. Even if there were, it would require the specific box to be highlighted at all times. Rendering any other console use impossible.
Whereas there are easy to implement codes to send accelerate and decelerate commands.