I am concerned that the OVMS v2 may be adding noise to the CAN bus, or causing problems in some other way (I know very little of CAN hardware, so can't really speculate much). I have heard other people mention CAN errors when OVMS is connected and yesterday I made my first trip with the unit connected to my C-Zero. During this trip the traction control failed - something it has never done before. The problem went away when the car was turned off and on again, but it seems too much of a coincidence for this to be unrelated. Does anyone have any opinions on this? Matt Beard
I have read somewhere that if you connect a bluetooth adapter with "torque" app you can disable the power steering (or was it the ABS)... so I would speculate that what you are experiencing is not a problem of noise, but rather a problem of the software that was uploaded in the ovms. Only speculation though. Nikolay ________________________________ From: Matt Beard <matt@beard.tv> To: OVMS Developers <ovmsdev@lists.teslaclub.hk> Sent: Monday, September 23, 2013 10:12 AM Subject: [Ovmsdev] CAN bus noise? I am concerned that the OVMS v2 may be adding noise to the CAN bus, or causing problems in some other way (I know very little of CAN hardware, so can't really speculate much). I have heard other people mention CAN errors when OVMS is connected and yesterday I made my first trip with the unit connected to my C-Zero. During this trip the traction control failed - something it has never done before. The problem went away when the car was turned off and on again, but it seems too much of a coincidence for this to be unrelated. Does anyone have any opinions on this? Matt Beard _______________________________________________ OvmsDev mailing list OvmsDev@lists.teslaclub.hk http://lists.teslaclub.hk/mailman/listinfo/ovmsdev
Except that with FEATURE_CANWRITE set to zero (as it is), the bus should be in listen-only mode. Matt On 23 September 2013 09:27, Nikolay Shishkov <nshishkov@yahoo.com> wrote:
I have read somewhere that if you connect a bluetooth adapter with "torque" app you can disable the power steering (or was it the ABS)... so I would speculate that what you are experiencing is not a problem of noise, but rather a problem of the software that was uploaded in the ovms. Only speculation though.
Nikolay
------------------------------ *From:* Matt Beard <matt@beard.tv> *To:* OVMS Developers <ovmsdev@lists.teslaclub.hk> *Sent:* Monday, September 23, 2013 10:12 AM *Subject:* [Ovmsdev] CAN bus noise?
I am concerned that the OVMS v2 may be adding noise to the CAN bus, or causing problems in some other way (I know very little of CAN hardware, so can't really speculate much).
I have heard other people mention CAN errors when OVMS is connected and yesterday I made my first trip with the unit connected to my C-Zero. During this trip the traction control failed - something it has never done before. The problem went away when the car was turned off and on again, but it seems too much of a coincidence for this to be unrelated.
Does anyone have any opinions on this?
Matt Beard
_______________________________________________ OvmsDev mailing list OvmsDev@lists.teslaclub.hk http://lists.teslaclub.hk/mailman/listinfo/ovmsdev
_______________________________________________ OvmsDev mailing list OvmsDev@lists.teslaclub.hk http://lists.teslaclub.hk/mailman/listinfo/ovmsdev
I haven't experienced any issues with traction control, but when i disconnect the OVMS module i can hear one "click" sound form the front of the car. Have also read that the same is happening on the Nissan Leaf when disconnect the CAN-Bluetooth adapter used with Leaf-Spy. No issues, just this click when disconnecting. Does anybody else experienced this click when disconnecting the OVMS module? Regards, Thomas 2013/9/23 Matt Beard OVMS <smvo@mxf.org.uk>
Except that with FEATURE_CANWRITE set to zero (as it is), the bus should be in listen-only mode.
Matt
On 23 September 2013 09:27, Nikolay Shishkov <nshishkov@yahoo.com> wrote:
I have read somewhere that if you connect a bluetooth adapter with "torque" app you can disable the power steering (or was it the ABS)... so I would speculate that what you are experiencing is not a problem of noise, but rather a problem of the software that was uploaded in the ovms. Only speculation though.
Nikolay
------------------------------ *From:* Matt Beard <matt@beard.tv> *To:* OVMS Developers <ovmsdev@lists.teslaclub.hk> *Sent:* Monday, September 23, 2013 10:12 AM *Subject:* [Ovmsdev] CAN bus noise?
I am concerned that the OVMS v2 may be adding noise to the CAN bus, or causing problems in some other way (I know very little of CAN hardware, so can't really speculate much).
I have heard other people mention CAN errors when OVMS is connected and yesterday I made my first trip with the unit connected to my C-Zero. During this trip the traction control failed - something it has never done before. The problem went away when the car was turned off and on again, but it seems too much of a coincidence for this to be unrelated.
Does anyone have any opinions on this?
Matt Beard
_______________________________________________ OvmsDev mailing list OvmsDev@lists.teslaclub.hk http://lists.teslaclub.hk/mailman/listinfo/ovmsdev
_______________________________________________ OvmsDev mailing list OvmsDev@lists.teslaclub.hk http://lists.teslaclub.hk/mailman/listinfo/ovmsdev
_______________________________________________ OvmsDev mailing list OvmsDev@lists.teslaclub.hk http://lists.teslaclub.hk/mailman/listinfo/ovmsdev
Guessing, but could it be a power relay? Something detecting 12V accessory?
On 23 Sep, 2013, at 5:11 pm, Thomas Bergo <thomas.bergo@gmail.com> wrote:
I haven't experienced any issues with traction control, but when i disconnect the OVMS module i can hear one "click" sound form the front of the car. Have also read that the same is happening on the Nissan Leaf when disconnect the CAN-Bluetooth adapter used with Leaf-Spy.
No issues, just this click when disconnecting. Does anybody else experienced this click when disconnecting the OVMS module?
Regards, Thomas
2013/9/23 Matt Beard OVMS <smvo@mxf.org.uk>
Except that with FEATURE_CANWRITE set to zero (as it is), the bus should be in listen-only mode.
Matt
On 23 September 2013 09:27, Nikolay Shishkov <nshishkov@yahoo.com> wrote: I have read somewhere that if you connect a bluetooth adapter with "torque" app you can disable the power steering (or was it the ABS)... so I would speculate that what you are experiencing is not a problem of noise, but rather a problem of the software that was uploaded in the ovms. Only speculation though.
Nikolay
From: Matt Beard <matt@beard.tv> To: OVMS Developers <ovmsdev@lists.teslaclub.hk> Sent: Monday, September 23, 2013 10:12 AM Subject: [Ovmsdev] CAN bus noise?
I am concerned that the OVMS v2 may be adding noise to the CAN bus, or causing problems in some other way (I know very little of CAN hardware, so can't really speculate much).
I have heard other people mention CAN errors when OVMS is connected and yesterday I made my first trip with the unit connected to my C-Zero. During this trip the traction control failed - something it has never done before. The problem went away when the car was turned off and on again, but it seems too much of a coincidence for this to be unrelated.
Does anyone have any opinions on this?
Matt Beard
_______________________________________________ OvmsDev mailing list OvmsDev@lists.teslaclub.hk http://lists.teslaclub.hk/mailman/listinfo/ovmsdev
_______________________________________________ OvmsDev mailing list OvmsDev@lists.teslaclub.hk http://lists.teslaclub.hk/mailman/listinfo/ovmsdev
_______________________________________________ OvmsDev mailing list OvmsDev@lists.teslaclub.hk http://lists.teslaclub.hk/mailman/listinfo/ovmsdev
_______________________________________________ OvmsDev mailing list OvmsDev@lists.teslaclub.hk http://lists.teslaclub.hk/mailman/listinfo/ovmsdev
Matt, If you run in listen-only mode (CAN_WRITE=0), there is very little impact on the car. In my experience, in that mode the only thing that would worry me would be a cabling fault (short, loose connection, etc). In active-mode (CAN_WRITE=1), the MCP2551 chip actively participates on the bus, so the chances of problem are much greater (in particular if we are also actually transmitting messages on the bus). In theory, if the CAN bus timing is off, then problems can also occur (especially in active-mode). The chipset we use (PIC + MCP2551) has highly tested in automotive environments. Regards, Mark. P.S. Every time I've been called in to look at a CAN bus error with OVMS, it has been faulty cabling. Thankfully, since we switched to factory-assembled cables, I haven't seen this. On 23 Sep, 2013, at 4:12 PM, Matt Beard <matt@beard.tv> wrote:
I am concerned that the OVMS v2 may be adding noise to the CAN bus, or causing problems in some other way (I know very little of CAN hardware, so can't really speculate much).
I have heard other people mention CAN errors when OVMS is connected and yesterday I made my first trip with the unit connected to my C-Zero. During this trip the traction control failed - something it has never done before. The problem went away when the car was turned off and on again, but it seems too much of a coincidence for this to be unrelated.
Does anyone have any opinions on this?
Matt Beard
_______________________________________________ OvmsDev mailing list OvmsDev@lists.teslaclub.hk http://lists.teslaclub.hk/mailman/listinfo/ovmsdev
participants (5)
-
Mark Webb-Johnson -
Matt Beard -
Matt Beard OVMS -
Nikolay Shishkov -
Thomas Bergo