High efficiency compression ignition aftertreatment devices for combined use of lean-burn combustion systems and three-way catalysts

A high efficiency compression ignition after-treatment system of a combustion engine, comprising:

• a first combustion chamber adapted to reciprocatably receive a first piston assembly;
• a second combustion chamber adapted to reciprocatably receive a second piston assembly;
• an air inlet passage connected to said first combustion chamber;
• a one-directional combustion exhaust passage connected to said first combustion chamber at a first end, and connected to said second combustion chamber at a second end, whereby exhaust is conducted from said first combustion chamber to said second combustion chamber;
• a fuel injector in fluid communication with said second combustion chamber;
• at least one fuel passage in fluid communication with said fuel injector;
• at least one fuel passage in fluid communication with said first combustion chamber;
• a processed exhaust gas passage having a first end and a second end, said first end being connected to said second combustion chamber;
• a three-way catalyst having an inlet coupled to said second end of said processed exhaust gas passage;
• an exhaust gas outlet sensor connected to said processed exhaust gas passage between said first end and said second end of said processed exhaust gas passage;
• a fuel controller coupled to said fuel injector and said exhaust gas outlet sensor, wherein said fuel controller controls delivery of fuel through said fuel injector in fluid communication with said second combustion chamber in response to a receiving signal from at least said exhaust gas outlet sensor;
• and
• an exhaust gas passage coupled to an outlet of said three-way catalyst.