ETB Frequency

[mtmotorsport]

I remember reading about the reason the default PWM frequency is 800hz but I can't find it. I think this is the cause of my repeated throttle body failures. They audibly make noise, and while that isn't a concern of itself it has lead to multiple throttle bodies with failed TPS circuits. I'm using GM throttle bodies, and they are being run at 800hz. The OEM operates them at 8000Hz as measured on my daily driver. At 8000hz they are near silent and last forever.

Is it a heat generation issue with the higher frequencies?

This is using Proteus v0.6 and MRE 0.5.x and MRE 0.6.0

[AndreyB]

quote from source code

! Matt says: The problem is the driver chip. Tle9201 can't do 20k. The drivers are too slow. On purpose to reduce EMI
! https://rusefi.com/forum/viewtopic.php?p=47307#p47307
#define ETB_HW_MAX_FREQUENCY 3000

[mtmotorsport]

Back at this again. New throttle body, lasted a few hours before starting to cause errors with TPS primary and secondary not matching. Seems the threshold is 5% error between the channels, and that is simply too close it seems. Previous throttle bodies had analog resistive traces for TPS signals. This new one uses a non contact hall effect position sensor. Same problem. These are gen4 LS throttle bodies. Some used with 200,000miles, some with 3 hours. None give any problems when installed on a stock C6 corvette.

Can the TPS error % be raised or adjustable like OE GM calibrations?

[mck1117]

I've never seen a throttle's position sensors (yes, hall like yours) deviate more than about 0.5% over temperature and their life without it being a wiring issue.

[mtmotorsport]

I'm running new wires direct from ecu to throttle body now.

This is over 3 different cars. Two on Proteus, one on MRE.

[mtmotorsport]

Tune: https://www.rusefi.com/online/view.php?msq=1567
Log too big to upload, fun starts at 658 seconds:

[AndreyB]

Rumors are Nissan Tiida (Versa?) uses TLE9201 at 1kHz

[mtmotorsport]

I've never seen a throttle's position sensors (yes, hall like yours) deviate more than about 0.5% over temperature and their life without it being a wiring issue.

Thanks for the push to check the wiring. While I didn't find any wiring faults I did find a bad AEM pressure sensor (Exhaust back pressure) that would momentarily short circuit when tapped with my finger. Unplugged the sensor and so far so good. I had bypassed the engine harness by running 2 new TPS wires directly to the ECU but this had no effect as it seems the cause of my problems was the 5v short.

[AndreyB]

Tune: https://www.rusefi.com/online/view.php?msq=1567
Log too big to upload, fun starts at 658 seconds:

Just leaving this here as a reference of hopefully happy PID settings

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