System and method for improving performance of combustion engines employing primary and secondary fuels

In an electronic system which controls timing and metering of a primary fuel delivered for combustion in an internal combustion engine, the system including one or more sensors for measuring engine operating parameters, and a processor unit which operates with software to provide outputs based on sensor output signal magnitudes to control settings for engine operation, an electronic subsystem, comprising:

• first circuitry for connection between a first sensor and the processor unit to receive first signals having first signal magnitudes from the first sensor, and generating second signals having second signal magnitudes each derived from a different one of the first signal magnitudes provided by the first sensor by imparting a shift to each in a plurality of the different ones of the first sensor output signal magnitudes, the second signal magnitudes provided for input to the processor unit in lieu of the plurality of the first sensor output signal magnitudes, each shift between a first magnitude and a second magnitude providing for an engine adjustment to an output from the processor unit.

A subsystem for use in combination with an electronic system in an internal combustion engine while the engine operates with a primary first fuel, the electronic system including one or more sensors to provide measurement signals for monitoring changes in one or more engine operating parameters and a processor unit configured to provide outputs, based in part on the measurement signals, to control timing and metering of the liquid fuel for delivery into one or more cylinders of the engine, or to control a fuel-to-air ratio, during engine operation, the subsystem comprising:

• NOx circuitry, for connection between a first of the sensors and the processor unit, comprising first circuitry and programmed to continually adjust an engine parameter to limit output of NOx while a variable amount of reactive hydrogen is being provided for combustion with the primary fuel and while the engine operates under dynamically varying conditions wherein, in response to receiving first measurement signals from the first sensor, the first circuitry provides second measurement signals to the processor unit in lieu of the first measurement signals, the second measurement signals generated by continually imparting magnitude shifts to the first measurement signals as engine operating conditions vary.