DBW Pedal Positio Pen vs TB Throttle Position - Page 2 - LotusTalk - The Lotus Cars Community
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post #21 of 23 (permalink) Old 02-28-2018, 04:53 AM Thread Starter
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Originally Posted by cyow5 View Post
It clips at 100 because that is the largest value. His labeling is confusing - "throttle" is the pedal, and the "auxiliary" is throttle. In post #11 you can see where he lifts briefly but too quickly for the ECU to respond. This is due to a filter, PID loop, and lookup tables
The missed lift of throttle by the ECU is not a lag problem. I did some measurements on the graph and 50% pedal creates 100% throttle. The lift you refer to was still above 50% pedal.

Later,
Eldon
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post #22 of 23 (permalink) Old 02-28-2018, 05:54 AM
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I didn't say it was a graphical clipping. Your realization that 50% pedal creates 100 (no-unit) throttle just emphasizes what I think I'm seeing. There's no lag that you'd expect in a PID algorithm, just a scaling of values. How are you logging "Auxiliary 1"?

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post #23 of 23 (permalink) Old 02-28-2018, 06:15 AM Thread Starter
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Originally Posted by DanKeen View Post
I didn't say it was a graphical clipping. Your realization that 50% pedal creates 100 (no-unit) throttle just emphasizes what I think I'm seeing. There's no lag that you'd expect in a PID algorithm, just a scaling of values. How are you logging "Auxiliary 1"?
Dan,

Both the pedal and throttle position are being read from the ECU via the OBDII/CAN port. The numbers being returned can only range from 0 - 100.

I will check the data logger to see if it is scaling the response correctly. The manufacturer of the data system wrote the decode for the CAN bus message.

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Eldon
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