Lubricating oil supplying system for engine
AssigneeYamaha Hatsudoki Kabushiki Kaisha
InventorsHiroyuki Kidera, Toru Izumi
Life of this patent
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Abstract
A lubricating system and method of operating the system for an internal combustion engine wherein the amount of lubricant supplied to the engine from a positive displacement engine driven pump is varied by selectively delivering lubricant from the pump to the engine or bypassing the lubricant back to the return of the pump. The amount of lubricant supplied is varied by changing both the duty ratio of the lubricant supply and the duration of engine supply in response to a map of engine conditions. Various control routines are disclosed and in each the lubricant supplied to the engine is monitored so that once a finite amount of lubricant is supplied, lubricant is not supplied again to the engine until that amount previously supplied has been consumed.
Claims48
A lubricating system for an internal combustion engine comprising a lubricant pump, lubricant control means for controlling the amount of lubricant delivered by said lubricant pump to said engine by selectively supplying lubricant from said lubricant pump to said engine and bypassing lubricant from said lubricant pump back to a return, means for sensing running conditions of the engine, and means for controlling the amount of lubricant supplied to the engine by said lubricant control means in response to the sensed engine conditions by varying the duty ratio of the lubricant control means and varying the length of time when said lubricant control means is in its supply condition.
A lubricating system for an internal combustion engine comprising a lubricant pump, lubricant control means for controlling the amount of lubricant delivered by said lubricant pump to said engine comprising a control valve for selectively supplying lubricant from the pump to the engine or for returning the lubricant from the pump back to a source of lubricant supply, means for sensing the running condition of an engine, means for varying the duty cycle of said control valve in response to the sensed running condition, and means for changing the duration of time when the control valve is in its lubricant supplying position in response to engine operation in a certain range.
A lubricating system for an internal combustion engine comprising a positive displacement lubricant pump driven in timed relationship to the engine, lubricant control means for controlling the amount of lubricant delivered by said lubricant pump to said engine, means for sensing the running condition of said engine, and means for providing a fixed amount of time when the lubricant control means permits the supply of lubricant to the engine from the lubricant pump under a certain range of running conditions whereby the amount of lubricant supplied will vary with engine speed.
A lubricating method for an internal combustion engine comprising a lubricant pump, said method comprising controlling the amount of lubricant delivered by said lubricant pump to said engine by selectively supplying lubricant from said lubricant pump to said engine and bypassing lubricant from said lubricant pump back to a return, sensing running conditions of the engine, and controlling the amount of lubricant supplied to the engine by said lubricant control means in response to the sensed engine conditions by varying the duty ratio and varying the length of time when said lubricant control means is in its supply condition.
A lubricating method for an internal combustion engine comprising a lubricant pump, lubricant control means for controlling the amount of lubricant delivered by said lubricant pump to said engine comprising a control valve for selectively supplying lubricant from the pump to the engine or for returning the lubricant from the pump back to a source of lubricant supply, and method comprising the steps of sensing the running condition of an engine, varying the duty cycle of said control valve in response to the sensed running condition, and changing the duration of time when the control valve is in its lubricant supplying position in response to engine operation in a certain range.
A lubricating method for an internal combustion engine comprising a positive displacement lubricant pump driven in timed relationship to the engine, said method comprising the steps of controlling the amount of lubricant delivered by said lubricant pump to said engine, sensing the running condition of said engine, and providing a fixed amount of time when the lubricant control means permits the supply of lubricant to the engine from the lubricant pump under a certain range of running conditions whereby the amount of lubricant supplied will vary with engine speed.
Dependencies are inferred from the claim text.