Clean power system

A power generation system, comprising:

• an axle;
• a direct injection compression-ignition diesel-powered internal combustion engine operative in low temperature combustion mode to produce an engine exhaust comprising CO and configured to provide shaft power to drive the axle;
• a fuel cell having an air side and a fuel side, the fuel cell being operative to remove at least 50% of the CO in the exhaust while producing useful power;
• an energy storage device configured to store energy produced by the fuel cell;
• and
• an electric motor that can be powered by the fuel cell or the energy storage device, the electric motor being configured to drive the axle or be driven by the axle;
• wherein
• the system is configured to keep the engine operating in low temperature combustion mode regardless of demands for shaft power to drive the axle and to respond to such demands by one or more of increasing power output from the fuel cell, increasing power output from the energy storage device, and decreasing power uptake from the energy storage device;
• and
• the system is configured to respond to decreases in demands for shaft power to drive the axle-by one or more of decreasing power output from the fuel cell, increasing power uptake by the energy storage device, and decreasing power output from the energy storage device;
• wherein the engine is configured to operate, after warm-up exclusively in low temperature combustion mode;
• and
• the low temperature combustion mode is a mode in which the engine produces a significant amount of torque, but with combustion temperatures sufficiently low that the exhaust contains little or no NOx and little or no particulate matter.