Stoichiometric high-temperature direct-injection compression-ignition engine

A neat-fuel direct-injected compression ignition engine, comprising:

• a. an engine combustion chamber including a thermal barrier coating on surfaces of said engine combustion chamber, wherein said surfaces comprise a piston surface, valve surfaces, and a head surface;
• b. a direct injection port disposed to inject a neat fuel, wherein said neat fuel comprises a neat fuel quantity that satisfies a stoichiometric condition with respect to an intake air quantity to said engine combustion chamber;
• c. a mechanical exhaust regenerator including turbine expansion stages disposed to transfer energy from an exhaust gas stage to an intake compression stage or to augment work output;
• d. an exhaust gas O2 sensor;
• e. a variable valve actuation (VVA) system controlling a position of an intake valve and a position of an exhaust valve;
• wherein:
• exhaust gas is regulated by closing said exhaust valve early with respect to a piston position using said VVA system, or
• said exhaust gas is recirculated external to said engine combustion chamber with an exhaust gas recirculation (EGR) system comprising a mass flow controller, a heat exchanger, and a flow path, wherein said flow path connects to an air intake of said engine combustion chamber;
• f. an exhaust gas temperature sensor;
• g. a gas pedal, wherein a position of said gas pedal is provided as a load command and said load command is implemented by controlling a quantity of said exhaust gas within said engine combustion chamber;
• and
• h. a computer programmed to:
• receive measurement signals from said exhaust temperature sensor and said exhaust gas O2 sensor,
• operate said EGR system to direct said exhaust gas to said engine combustion chamber according to said measurement signals from said exhaust temperature sensor,
• change an opening timing and a closing timing of said VVA system according to said measurement signals from said exhaust temperature sensor, and
• operate a fuel injector to deliver said neat fuel quantity with respect to said amount of intake air that is independent of how much exhaust is retained or recirculated within said engine combustion chamber according to said measurement signals from said exhaust gas O2 sensor.