Method of operating gaseous fueled engine
AssigneeYamaha Hatsudoki Kabushiki Kaisha
InventorYoshikatsu Iida
Life of this patent
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Abstract
A gaseous fueled engine and method for controlling the gaseous fuel supply using a feedback control to maintain a stoichiometric mixture under all normal running conditions. The feedback control is discontinued under certain running conditions and control is provided in another method so as to accommodate situations such as starting, conditions when the catalyst associated with the engine is overheated, conditions when the engine is running at wide open throttle to avoid the possibility of catalyst overheating and conditions of rapid deceleration so as to reduce the fuel supply and avoid overly rich exhaust gases when the engine is operating as a pump under extreme deceleration.
Claims64
A gaseous fueled engine having an induction system including a charge former for supplying a fuel-air mixture to said engine and comprising an induction passage for receiving atmospheric air and a fuel supply circuit for receiving gaseous fuel from a source of gaseous fuel stored under pressure and mixing said fuel with the air in said induction passage for forming a fuel-air mixture for said engine, an air bleed passage communicating an atmospheric air inlet with said fuel supply circuit, an automatic air bleed control valve in said air bleed passage for controlling the amount of air bled into said fuel supply circuit to control the mixture strength, an engine combustion sensor for detecting the air-fuel ratio, feedback control means for receiving a signal from said engine combustion sensor and controlling said automatic air bleed valve to maintain the desired air-fuel ratio, means for sensing a condition different from a normal steady-state running condition of said engine, and means for discontinuing feedback control of said automatic air bleed valve under the sensing of said condition and regardless of whether the feedback control system and engine are in such a state that feedback control could be operative and operating said automatic air bleed valve with a different control strategy and without utilizing the output of said engine combustion condition sensor.
A method of operating a gaseous fueled engine having an induction system including a charge former for supplying a fuel-air mixture to said engine and comprising an induction passage for receiving atmospheric air and a fuel supply circuit for receiving gaseous fuel from a source of gaseous fuel stored under pressure and mixing said fuel with the air in said induction passage for forming a fuel-air mixture for said engine, an air bleed passage communicating an atmospheric air inlet with said fuel supply circuit, an automatic air bleed control valve in said air bleed passage for controlling the amount of air bled into said fuel supply circuit to control the mixture strength, an engine combustion sensor for detecting the air-fuel ratio, said method comprising the steps of receiving a signal from said engine combustion sensor and controlling said automatic air bleed valve to maintain the desired air-fuel ratio, sensing a condition different from a normal steady-state running condition of said engine, and discontinuing feedback control of said automatic air bleed valve under the sensing of said condition even though the condition of the engine and feedback control system are such that feedback control would be possible and operating said automatic air bleed valve with a different control strategy and without utilizing the output of said engine combustion condition sensor.
A gaseous fueled engine having an induction system including a charge former for supplying a fuel-air mixture to said engine and comprising an induction passage for receiving atmospheric air and a fuel supply circuit for receiving gaseous fuel from a source of gaseous fuel stored under pressure and mixing said fuel with the air in said induction passage for forming a fuel-air mixture for said engine, an air bleed passage communicating an atmospheric air inlet with said fuel supply circuit, an automatic air bleed control valve in said air bleed passage for controlling the amount of air bled into said fuel supply circuit to control the mixture strength, an engine combustion sensor for detecting the air-fuel ratio, feedback control means for receiving a signal from said engine combustion sensor and controlling said automatic air bleed valve to maintain the desired air-fuel ratio, a throttle control for controlling the speed of said engine, a throttle position switch providing an output signal indicative of wide open throttle, and means for discontinuing feedback control of said automatic air bleed valve when said throttle position sensor outputs a signal indicative of wide open throttle.
A method of operating a gaseous fueled engine having an induction system including a charge former for supplying a fuel-air mixture to said engine and comprising an induction passage for receiving atmospheric air and a fuel supply circuit for receiving gaseous fuel from a source of gaseous fuel stored under pressure and mixing said fuel with the air in said induction passage for forming a fuel-air mixture for said engine, an air bleed passage communicating an atmospheric air inlet with said fuel supply circuit, an automatic air bleed control valve in said air bleed passage for controlling the amount of air bled into said fuel supply circuit to control the mixture strength, an engine combustion sensor for detecting the air-fuel ratio, a throttle control for controlling the speed of the engine, said method comprising the steps of receiving a signal from said engine combustion sensor and controlling said automatic air bleed valve to maintain the desired air-fuel ratio, sensing when the throttle control is in a wide open throttle condition, and discontinuing feedback control of said automatic air side open throttle condition bleed valve under the sensing of said condition.
Dependencies are inferred from the claim text.