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Sunday, February 18, 2018

Groking the Cadillac ELR

Those who know me well know that I have a passion for electric vehicles (EVs). I own a Tesla Model S, have driven it across the US and Canada twice, and am currently designing an electric bicycle with design cues taken from larger EVs and based on lessons learned from my electric skateboard project. I really can not scratch the itch to drive and learn more about EVs.

Last fall I purchased a  to keep my Tesla company in the garage. I am a huge fan of this car for the striking good looks and the fact that it is a 2-door coupe. I had also never experienced a PHEV (Plug-In Hybrid Electric Vehicle) and really wanted to try out the GM Voltec platform. The prices of the Cadillac ELR are plummeting due to their relatively short-lived time on the market and the fact that they are a little unknown in the eyes of the average consumer.

Cadillac ELR at Cardinale GMC in Seaside, California
I did not buy this car with the intention of merely letting it sit in the garage though. One of the great features of the Tesla Model S is that it lets you "nerd out" with all kinds of stats about your trip. You get total energy consumption in kWh, efficiency in Wh/mile, range estimates based on change in elevation/speed and a whole lot more that makes driving a true delight.

The Cadillac ELR (and Chevy Volt - they share the same powertrain and a similar UI) tend to shield you from these details. I wanted more and without having to do quick mental math based on the limited information available from the built-in infotainment system.

Speed, Distance, Total Energy and Wh/mi Top | State of Charge (SoC) kWh Left | Speed mph Right
I spent about a week decoding traffic on the CAN bus of the ELR in an effort to find a few signals: speed, state of charge (SoC) in kWh, and odometer or a trip of some sort. Once I found these fields, I built a UI with PyQt to render statistics in real-time.

CAN Bus Interface Cable
I packaged it all up into a neatly organized cable and used a to read data from the CAN buses and visualize it on a small display. Continue reading for more details.

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