Patent ID: 6273065
Filing Date: 2001-08-14
Classification: F02D,F02P

Abstract:
A method of controlling an air to fuel mixture to an internal combustion engine having a carburetor, and a bleed device in fluid communication with the carburetor to control the air to fuel mixture supplied to the engine, the steps comprising:measuring engine timing parameters including an intake stroke period and a power stroke period;calculating an engine stability value using the engine timing parameters including calculating an instantaneous engine speed, an average engine speed, an instantaneous torque, and an average torque;comparing the engine stability value to threshold stability criteria to determine if the engine stability value is greater than the stability criteria;providing an open time signal to the bleed device; andadjusting the open time signal for the bleed device by decreasing the duration of the open time signal if the engine stability value is greater than the stability criteria and increasing the duration of the open time signal if the engine criteria is not greater than the stability criteria.