Automatic fuel control system

Claim 1

A system for automatically regulating the fuel supplied to an engine of a mobile construction machine including a hydraulic pump driven by said engine, a tool carried by said machine for performing work functions, at least one hydraulic cylinder for manipulating said tool responsive to pressurized fluid being supplied to said hydraulic cylinder from said hydraulic motor, a reservoir of hydraulic fluid, hydraulic lines providing communication between said reservoir, hydraulic motor and said hydraulic cylinder, a manually operated valve mechanism for controlling the flow of hydraulic fluid between said hydraulic pump and said hydraulic cylinder, and a lever arm for regulating the flow of fuel to said engine, the improvement comprising: a double action cylinder having: (i) fluid ports adjacent opposed ends of said cylinder; (ii) a piston carried in said double action cylinder; (iii) a piston rod carried by said piston extending out of one end of said cylinder; means connecting said piston rod to said lever arm for moving said lever arm responsive to the movement of said piston in said double action cylinder; a hydraulic line connected between said valve mechanism and said hydraulic pump and one of said fluid ports of said double action cylinder for shifting said piston responsive to movement of said manually operated valve mechanism; bypass openings provided in said double action cylinder for allowing a bleed-through of fluid from one side of said piston to the opposed side for minimizing the response time for movement of said piston responsive to pressurized hydraulic fluid being supplied to said hydraulic cylinder; whereby said piston causes said lever arm to be moved for regulating the flow of fuel to said engine responsive to the flow of hydraulic fluid being supplied to said hydraulic cylinder.

Claim 2

A system for automatically regulating the fuel supplied to an engine of a mobile construction machine including a hydraulic pump driven by said engine, a tool carried by said machine for performing work functions, at least one hydraulic cylinder for manipulating said tool responsive to pressurized fluid being supplied to said hydraulic cylinder from said hydraulic motor, a reservoir of hydraulic fluid, hydraulic lines providing communication between said reservoir, hydraulic motor and said hydraulic cylinder, a manually operated valve mechanism for controlling the flow of hydraulic fluid between said hydraulic pump and said hydraulic cylinder, and a lever arm for regulating the flow of fuel to said engine, the improvement comprising: a double action cylinder having: (i) fluid ports adjacent opposed ends of said cylinder; (ii) a piston carried in said double action cylinder; (iii) a piston rod carried by said piston extending out of one end of said cylinder; means connecting said piston rod to said lever arm for moving said lever arm responsive to the movement of said piston in said double action cylinder; a hydraulic line connected between said valve mechanism and said hydraulic pump and one of said fluid ports of said double action cylinder for shifting said piston responsive to movement of said manually operated valve mechanism; bypass openings provided in said double action cylinder for allowing a bleed-through of fluid from one side of said piston to the opposed side for minimizing the response time for movement of said piston responsive to pressurized hydraulic fluid being supplied to said hydraulic cylinder; whereby said piston causes said lever arm to be moved for regulating the flow of fuel to said engine responsive to the flow of hydraulic fluid being supplied to said hydraulic cylinder.

Claim 5

A system for automatically regulating the fuel supplied to an engine of a mobile construction machine including a hydraulic pump driven by said engine, a tool carried by said machine for performing work functions, at least one tool control hydraulic cylinder for manipulating said tool responsive to pressurized fluid being supplied to said tool control hydraulic cylinder from said hydraulic pump a reservoir of hydraulic fluid, a tool control hydraulic line connecting said hydraulic pump to said tool control hydraulic cylinder, a manually operated valve mechanism for controlling the flow of hydraulic fluid between said hydraulic pump and said tool control hydraulic cylinder, and a lever arm for regulating the flow of fuel to said engine, the improvement comprising: a double action cylinder having: (i) fluid ports adjacent opposed ends of said cylinder; (ii) a piston carried in said double action cylinder; (iii) a piston rod carried by said piston extending out one end of said cylinder; means for connecting said piston rod to said lever arm for varying the flow of fuel to said engine response to the movement of said piston in said double action cylinder; a high pressure hydraulic line extending from said tool control hydraulic line to one port of said double action cylinder causing said piston to move responsive to changes in hydraulic pressure to said tool control hydraulic cylinder; a low pressure hydraulic line extending from said other port of said double action cylinder and said reservoir, and a hydraulic fluid bypass means providing fluid communication from one side of said piston to the other side of said piston for permitting said lever arm to be manually shifted without adverse interference from said double action cylinder for regulating the flow of fuel to said engine.

Claim 6

A system for automatically regulating the fuel supplied to an engine of a mobile construction machine including a hydraulic pump driven by said engine, a tool carried by said machine for performing work functions, at least one tool control hydraulic cylinder for manipulating said tool responsive to pressurized fluid being supplied to said tool control hydraulic cylinder from said hydraulic pump a reservoir of hydraulic fluid, a tool control hydraulic line connecting said hydraulic pump to said tool control hydraulic cylinder, a manually operated valve mechanism for controlling the flow of hydraulic fluid between said hydraulic pump and said tool control hydraulic cylinder, and a lever arm for regulating the flow of fuel to said engine, the improvement comprising: a double action cylinder having: (i) fluid ports adjacent opposed ends of said cylinder; (ii) a piston carried in said double action cylinder; (iii) a piston rod carried by said piston extending out one end of said cylinder; means for connecting said piston rod to said lever arm for varying the flow of fuel to said engine response to the movement of said piston in said double action cylinder; a high pressure hydraulic line extending from said tool control hydraulic line to one port of said double action cylinder causing said piston to move responsive to changes in hydraulic pressure to said tool control hydraulic cylinder; a low pressure hydraulic line extending from said other port of said double action cylinder and said reservoir, and a hydraulic fluid bypass means providing fluid communication from one side of said piston to the other side of said piston for permitting said lever arm to be manually shifted without adverse interference from said double action cylinder for regulating the flow of fuel to said engine.

Claim 8

A system for automatically regulating the fuel supplied to an engine of a mobile construction machine including a hydraulic motor driven by said engine, a tool carried by said machine for performing work functions, at least one tool control hydraulic cylinder for manipulating said tool responsive to pressurized fluid being supplied to said tool control hydraulic cylinder from said hydraulic pump a reservoir of hydraulic fluid, a tool control hydraulic line connecting said hydraulic pump to said tool control hydraulic cylinder, a manually operated valve mechanism for controlling the flow of hydraulic fluid between said hydraulic pump and said tool control hydraulic cylinder, and a lever arm for regulating the flow of fuel to said engine, the improvement comprising: a double action cylinder having: (i) fluid ports adjacent opposed ends of said cylinder; (ii) a piston carried in said double action cylinder; (iii) a piston rod carried by said piston extending out one end of said cylinder; means for connecting said piston rod to said lever arm for varying the flow of fuel to said engine response to the movement of said piston in said double action cylinder; a high pressure hydraulic line extending from said tool control hydraulic line to one port of said double action cylinder causing said piston to move responsive to changes in hydraulic pressure to said tool control hydraulic cylinder; valve means interposed in said high pressure line for regulating the flow of hydraulic fluid to said one port of said hydraulic line; a bypass line connected between said high pressure hydraulic line and said reservoir, and valve means interposed in said bypass line for controlling the flow of hydraulic fluid being drawn out of said hydraulic line and fed to said reservoir.

Claim 9

A system for automatically regulating the fuel supplied to an engine of a mobile construction machine including a hydraulic motor driven by said engine, a tool carried by said machine for performing work functions, at least one tool control hydraulic cylinder for manipulating said tool responsive to pressurized fluid being supplied to said tool control hydraulic cylinder from said hydraulic pump a reservoir of hydraulic fluid, a tool control hydraulic line connecting said hydraulic pump to said tool control hydraulic cylinder, a manually operated valve mechanism for controlling the flow of hydraulic fluid between said hydraulic pump and said tool control hydraulic cylinder, and a lever arm for regulating the flow of fuel to said engine, the improvement comprising: a double action cylinder having: (i) fluid ports adjacent opposed ends of said cylinder; (ii) a piston carried in said double action cylinder; (iii) a piston rod carried by said piston extending out one end of said cylinder; means for connecting said piston rod to said lever arm for varying the flow of fuel to said engine response to the movement of said piston in said double action cylinder; a high pressure hydraulic line extending from said tool control hydraulic line to one port of said double action cylinder causing said piston to move responsive to changes in hydraulic pressure to said tool control hydraulic cylinder; valve means interposed in said high pressure line for regulating the flow of hydraulic fluid to said one port of said hydraulic line; a bypass line connected between said high pressure hydraulic line and said reservoir, and valve means interposed in said bypass line for controlling the flow of hydraulic fluid being drawn out of said hydraulic line and fed to said reservoir.