Compound cycle rotary engine

A compound cycle engine system comprising:

• a rotary engine, said rotary engine generating exhaust gas;
• means for supplying inlet air at a pressure in the range of from 3.0 to 5.0 atmospheres and a temperature in the range of from 150 to 250 degrees Fahrenheit to said rotary engine;
• said air supplying means comprising a compressor;
• means for extracting energy from said exhaust gas;
• said energy extracting means comprising a first turbine connected to the compressor by a shaft which receives said exhaust gas from said engine;
• said energy extracting means comprising a second turbine having an output shaft, said second turbine receiving said exhaust gas from an outlet of said first turbine, and said second turbine has an expansion ratio in the range of 2.1:1 to 7.0:1;
• said engine has a power shaft and said output shaft being connected to said power shaft;
• said rotary engine being a Miller cycle rotary engine;
• said rotary engine having an intake port and an exhaust port;
• said intake and exhaust ports being arranged so that said engine has a cycle in which an internal expansion volume is greater than an internal compression volume;
• said engine having an intake port which opens opening at 0 to 15 degrees after top dead center and which closes closing at 115-140 degrees after bottom dead center;
• and
• said engine having an exhaust port which opens opening at 70 to 90 degrees before bottom dead center.

A vehicle having a propulsion system, which propulsion system comprises a compound cycle engine system comprising:

• a rotary engine having a displacement of from 1 to 10 liters, said rotary engine generating exhaust gas;
• said rotary engine being operated so that intake and exhaust pressures are within 0.5 atmospheres;
• said rotary engine having an intake port and an exhaust port;
• said intake and exhaust ports being arranged so that said engine has a cycle in which an internal expansion volume is greater than an internal compression volume;
• means for supplying inlet air at a pressure in the range of from 3.0 to 5.0 atmospheres and a temperature in the range of from 150 to 250 degrees Fahrenheit to said rotary engine;
• said air supplying means comprising a compressor;
• means for extracting energy from said exhaust gas;
• said energy extracting means comprising a first turbine connected only to the compressor by a shaft, which said first turbine receives said exhaust gas from said engine;
• said energy extracting means comprising a second turbine having an output shaft, said second turbine receiving said exhaust gas from an outlet of said first turbine, and said second turbine has an expansion ratio in the range of 2.1:1 to 7.0:1;
• and
• said engine has a power shaft and said output shaft being connected to said power shaft.