I’ve been doing more fiddling with log file and VE analysis, and I’m a little stumped as to where to go with it next. A Bit Of Background VE analysis is basically looking at what the air/fuel ratio the car is running at at a specific load/speed, comparing that to what we think it should be, and then fiddling with the fueling to get it closer to the ideal. The authors of the original Megasquirt firmware published a PDF that went in the basic maths of this.
Two posts in two days? I’m on a roll! The two main applications in the world of Speeduino/Megasquirt ECU logging are TunerStudio to generate log files and MegaLogViewer to examine them. Whilst they are both very useful applications (I have bought full fat licences for both), they lack position information. When I’m driving my car and it does something weird, I tend to remember where I was (e.g. approaching the roundabout on the A1081) rahter than when I was (5m20s into the drive).
I’ve recently been trying to improve the efficiency of The Supid Car. Fundamentally, within the ECU is a 16 by 16 table of values. One axis is engine speed, the other is the amount of air the engine is trying to suck in. Each cell in the table contains a value that relates to how long the fuel injectors should fire for. There are a bunch of correction factors thrown in for air temperature, engine temperature, how long the engine has been running etc but simply it’s just a lookup on that table.
I recently treated myself to a Creality K1C printer with the purpose of being able to print ABS bits for the Fury. It’s a fabulous printer, much more reliable than the Ender 3 Pro I have (and we won’t even mention the Vertex K8800 that has never worked properly) Anyway, the current mount I have is down on the transmission tunnel, and not easy to glance at. The last time I was in the car, it occured to me I could probably put my phone on the dash behind the steering wheel without blocking the view of anything important.
I’ve found a use for LLMs that I’m comfortable with. Several times I’ve found that I need to write a simple script to do something, but it’s always a grind to do. Why not get a computer to do the grind then? At home I have a NAS called luggage (named for the equivalent in Discworld, but so far the NAS has not sprouted feet) and I host git repositories there so I can easily swap between desktop and laptop without a 3rd party service.