Re: Forcemotor control
Posted: Sun Jan 07, 2018 1:38 pm
What measured line pressure psi do you get at "0%" ?
James
James
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dont have that readingjsmcortina wrote:What measured line pressure psi do you get at "0%" ?
James
You really need that one though!!kikkegek wrote:dont have that readingjsmcortina wrote:What measured line pressure psi do you get at "0%" ?
James
well glad I went out there again to take this video. hope you find something. thanks for the quick reply'sjsmcortina wrote:Something does seem a bit fishy here, possibly a number overflow in the firmware. I'll check it on a scope.
James
I tested on the scope using your MSQ and EPC test mode. The PWM duty from 0 to 100% works exactly as expected.jsmcortina wrote:Something does seem a bit fishy here, possibly a number overflow in the firmware. I'll check it on a scope.
so the INJ2 output signal checks out just fine as you can see from the video.ashford wrote:
this code isnt just for 4l80, different solenoids have different impedance, for example the 4r70 has 3 different impedance epc solenoids the latest was high impedance and has a control range for me of 20-80%. also you can add a resistor inline with it to widen the window, i have done this to the 4l80 install i did as it works much better.
with the information you have posted it leads me to believe there are 2 possible modes of failure.
1. amperage readings are inaccurate and there is a hydraulic issue
2. wiring/solenod issue or failing/self protecting transistor in microsquirt
for #1 amp clamp style ampmeter are very inacurate at lower currents. there is a trick to this wrap the wire around the clamp 10 times in a coil so that the wire passes through the center 10 times an you will have a reading 10 times higher. also being that this is a pwm signal on an inductor this can do funny things. you might be able to get a more accurate reading in ac mode so long as you are in the 30-70% range. when doing an actual test it would probably be be best to do a dc reading on the switched power side with no flyback. with flyback it woul be best beteen transisot and flyback.
if that checks out fine i would then unplug the us find its pressure solenoid wire , put a jumper in it and ground it. if it has the same readings as when testmode has 0% there is a wiring problem from us to solenoid or solenoid. if it is different ther is a problem with the us, ground, horrible flyback, transistor or it is self protecting
put a jumper on the PCS (connected it to ground) and measured the current. Its about 2.5Amps. is that close enough to the 3A when in operation?kikkegek wrote:Next thing I am trying is to ground the PCS and see if I also get about 3Amps.ashford wrote:
if that checks out fine i would then unplug the us find its pressure solenoid wire , put a jumper in it and ground it. if it has the same readings as when testmode has 0% there is a wiring problem from us to solenoid or solenoid. if it is different ther is a problem with the us, ground, horrible flyback, transistor or it is self protecting
excellent. Thanks for the suport Jamesjsmcortina wrote:When I get chance, I'll update the documentation to suggest that diode is installed.
James
hey mate just a heads up, when you 'cant feel the shifts' is not great, you want the shifts to be firm.kikkegek wrote::
I am so happy right now............the transmission shift like butter. I cant even feel the shifts at the current settings. I need to check my Shadow Dash or TS display to know what gear I am in.
I guess now its just tuning to see where the smoothness turns into tight shifts...but I am so happy I have control over it now.
thanks for the awesome support
thank you Jamies. appreciate that. That was clear to me. you dont want it to "slide" into the ext gear. I understand that will cause unnecessary wear on the friction plates. So I am currently tuning and test driving and upping the line pressure constantly looking where firm meets comfort.jamies wrote: hey mate just a heads up, when you 'cant feel the shifts' is not great, you want the shifts to be firm.
when you have the line pressure so far down the shifts are smooth you are causing a LOT of slippage in the transmisison frictions and its not going to last that long
thanks for your feedback. I havent found anybody yet that used the 4L80E stock and could give me feedback. nice to hear it helped you in another install too (Y)wes kiser wrote:For what its worth, I think with all solenoids connected to the injector outputs this is likely a good idea/fundamentally more correct (we don't want rapid opening and closing like an injector)
In a ford E40d install, I tried both with and without the diode. Without the diode I had to reduce line pressure to less than 5% to get and real reduction in line pressure, and the the pressure had an extremely rapid oscillation. With the diode, line pressure appeared to be at a minimum possible value below 60%, and linearly increase above that point. It was also very stable.
At "peak" (which occured between 40-60% duty cycle) temperature, I observed about 50 degree above ambient temperature increase of the diode. Above 60% line pressure it began to cool off.
While I have used the microsquirt trans stuff on several installs, I had never really reduced line pressure and tried to soften shifting (they were either stock trans, or race application that "all the line pressure" was what the owner wanted). This install was harsh enough low load I actually searched for a solution. Glad I found this thread.