<div dir="ltr"><div>I was not aware of the industry standard -40C offset, so thank you (all) for good inputs. <br>The "problem" is hereby addressed :)<br></div><div><br><br></div><div>@Kevin: Can you recall the highest motor temperature ever seen on the Roadster? Do you know is Model S has the same temperature characteristics as the Roadster?<br>
<br></div><div>Br.<br>Håkon<br></div><div class="gmail_extra"><br><br><div class="gmail_quote">2014/1/13 Mastro Gippo <span dir="ltr"><<a href="mailto:gipmad@gmail.com" target="_blank">gipmad@gmail.com</a>></span><br>
<blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir="ltr"><div><div>Håkon, it is industry standard to apply an offset of -40C. We should do that instead of transforming it to signed, as Collin said. That would also be directly compatible to the CAN message from the twizy. Let's wait for Mark's opinion.<br>
</div>Regards<span class=""><font color="#888888"><br></font></span></div><span class=""><font color="#888888">MG<br></font></span></div><div class=""><div class="h5"><div class="gmail_extra"><br><br><div class="gmail_quote">
2014/1/13 Håkon Markussen <span dir="ltr"><<a href="mailto:hakon.markussen@gmail.com" target="_blank">hakon.markussen@gmail.com</a>></span><br>
<blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir="ltr"><div><div><div><div>The highest motor temperature I ever have seen on Think City is ~45 C. This is the offset for the cooling thermostat<br>
</div><div><br>I cannot even imagine that other EV-motors should reach a temperature near 100C? Then the cooling system have to be out of order ... or ...?<br>
<br>Anybody who knows the expected operation range of motor temp for Roadster, Leaf, iMiEV and Zwizy?<br><br></div>Think City reports temperature in 8 bits - signed.<br></div>When bit8 (msb) is set to "1" it means negative temperature, so when the motor temp actually is -1C , OVMS reports 255C. When motor temp is -11 Ovms reports 245C ,etc.<br>
</div><div><br></div><div>I think that this problem might apply to all vehicles(?).<br><br></div><div></div>Mark, do you have any suggestion for solution?<br><br></div>Br.<span><font color="#888888"><br>Håkon<br>
</font></span></div><div><div><div class="gmail_extra"><br><br>
<div class="gmail_quote">2014/1/13 Collin Kidder <span dir="ltr"><<a href="mailto:collink@kkmfg.com" target="_blank">collink@kkmfg.com</a>></span><br><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">
<div dir="ltr">I don't think you'd want to do that. 127 deg C really isn't that terribly hot and -128C is extremely cold. If it is necessary to retain use of an 8 bit variable then the standard solution is to just offset the temperature stored by -40. That way you can read -40 to 215C which is a pretty reasonable range. Unfortunately, I fear such a change would necessitate many other changes in code. It might be better to expand to a signed 16 bit integer.<br>
<div class="gmail_extra"><br><br><div class="gmail_quote"><div><div>On Mon, Jan 13, 2014 at 7:50 AM, Håkon Markussen <span dir="ltr"><<a href="mailto:hakon.markussen@gmail.com" target="_blank">hakon.markussen@gmail.com</a>></span> wrote:<br>
</div></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div><div><div dir="ltr"><div><div><div>Hi (Mark).<br><br></div>In ovms.h the motor temperature is defined as unsigned char (non-negative):<br>
extern unsigned char car_tmotor; // Tmotor<br><br></div>Currently the weather is cold in Norway (-15 C) and I noticed that motor temp was 244C.<br>
<br></div><br><div><div><div><div>Is it possible to update the car_tmotor to<br>extern signed char car_tmotor; // Tmotor<br></div><div> in ovms.h?<br></div><div><br></div><div>Best regards<span><font color="#888888"><br>
</font></span></div><span><font color="#888888"><div>Håkon<br></div></font></span></div>
</div></div></div>
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