Line Pressure reading unstable at zero psi
Line Pressure reading unstable at zero psi
Bench setup, looks like this:
In the first part of the log, the cal points are 20 psi/.489V and 480 psi/ 3.951V. It gives good values when I apply shop air pressure to the sensor, but about 20 psi low. When I put in the actual sensor calibration values, line pressure is erratic at zero applied pressure. When I apply 100psi, it settles down and line pressure = applied pressure.
Is line pressure gauge or absolute? Should I not use 0psi as a cal point?
- Attachments
-
- GPIO_MShift_4145.ini
- (221.4 KiB) Downloaded 554 times
-
- CurrentTune.msq
- (45.61 KiB) Downloaded 680 times
-
- 2014-11-30_09.02.27.msl
- (122.88 KiB) Downloaded 569 times
-
- Posts: 1696
- Joined: Fri Apr 04, 2008 1:28 pm
Re: Line Pressure reading unstable at zero psi
Thanks for spotting this. It looks like something is messed up in the code. In the meantime I would use the table value rather than the 2-point calculations. I will have a look in the line pressure sensor code and post test code here for you to try shortly.
Lance.
-
- Posts: 1696
- Joined: Fri Apr 04, 2008 1:28 pm
Re: Line Pressure reading unstable at zero psi
This code should be better (it is on my bench):
Let me know if this doesn't fix it for you.
Lance.