Small Engine Oxygen Depletion Shutoff Algorithm and Implementation

The Problem:
Currently, gasoline-powered generators are releasing unsafe levels of CO to confined spaces. Incomplete oxidation during combustion in gas ranges and unvented gas or kerosene heaters may cause high concentrations of CO in indoor air. To solve this problem, a generator that will release the lowest possible CO emissions must be developed.

The Solution:
Researchers at The University of Alabama have developed a new technology which is an improvement of the confined engine operation detection strategy. It does not need the us of CO sensors, but uses information already generated in the engine controller to determine when the there is a decrease of oxygen in the area. The algorithm analyzes the trends in the control system data and shuts off when the oxygen amount has decreased to a preset lower limit.


  • Improved safety
  • Meets new federal standards
  • Faster shutdown compared to previous technology

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