Engine control system and method
AssigneeYamaha Hatsudoki Kabushiki Kaisha
InventorHidenori Akatsuka
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Abstract
A control system and method for an internal combustion engine that employs a throttle position sensor and an engine speed sensor. The initial fuel air ratio control is based upon a map experimentally determined from throttle position and engine speed settings for optimum performance. However, in the event the throttle position sensor is deemed to be inaccurate, then another method is utilized for engine control purposes. In most embodiments, a map is also used in the other way.
Claims20
An engine control system for an internal combustion engine having a combustion chamber, an induction and charge forming system for supplying an air fuel charge to the engine, an exhaust system for discharging a burnt charge from the engine, an air fuel control system including an engine speed sensor for sensing the speed of said engine, and an engine throttle position sensor which senses the condition of the operator demand for engine output, said air fuel control system setting a fuel supply amount from the outputs from the engine speed and operator demand signals indicated by said engine speed sensor and said engine throttle position sensor if the output of said throttle position sensor is deemed to be accurate based upon a map indicative of air fuel ratio in relation to engine operator control position and engine speed and in another way if said throttle position sensor is deemed to be inaccurate.
An engine control method for an internal combustion engine having a combustion chamber, an induction and charge forming system for supplying an air fuel charge to the engine, an exhaust system for discharging a burnt charge from the engine, an air fuel control system including an engine speed sensor for sensing the speed of said engine, and an engine throttle position sensor which senses the condition of the operator demand for engine output, said method comprising the steps of setting a fuel supply amount from the outputs from the engine speed and operator demand signals indicated by said engine speed sensor and said engine throttle position sensor if the output of said throttle position sensor is deemed to be accurate based upon a map indicative of air fuel ratio in relation to engine operator control position and engine speed and in another way if said throttle position sensor is deemed to be inaccurate.
Dependencies are inferred from the claim text.