Small engine control system and method for enabling the use of traditional crankshaft

A four stroke cycle internal combustion engine, comprising:

• a single notch crankshaft connected to said piston;
• a crankshaft position sensor configured to detect the single notch crankshaft rotational movements and generating periodic pickup electrical signals as the single notch crankshaft rotates during a combustion cycle, wherein one crankshaft position sensor pickup electrical signal being generated for each full rotation of the single notch crankshaft;
• an intake manifold air pressure sensor configured to continuously measure air pressure in an intake manifold in the engine;
• and
• an engine ignition controller configured to execute an ignition synchronization process comprising:
• continuously receiving the intake manifold air pressure measurements;
• periodically receiving the crankshaft position sensor pickup electrical signals;
• verifying a crankshaft angular velocity for each full rotation of the single notch crankshaft using a computed capture window of crankshaft position sensor pickup electrical signal;
• if the current crankshaft angular velocity is verified, determining a spark advance based on the crankshaft angular velocity;
• computing a next capture window of the next crankshaft position sensor pickup electrical signal using two or more successive crankshaft position sensor pickup electrical signals;
• determining correct points of spark triggering at approximately after each of the received crankshaft position sensor pickup electrical signals that immediately follows each rising edge in the intake manifold air pressure measurements with an adjustment based on the spark advance if available;
• and
• generating a spark-triggering electrical signal at each correct point of spark triggering.