초록 ▼

An electronically controlled, hydraulically actuated precision governor controls the operating RPM of an internal combustion engine by repositioning the engine throttle in response to changes in engine RPM. The piston of a hydraulic actuator is coupled to the throttle. The flow of hydraulic fluid to

An electronically controlled, hydraulically actuated precision governor controls the operating RPM of an internal combustion engine by repositioning the engine throttle in response to changes in engine RPM. The piston of a hydraulic actuator is coupled to the throttle. The flow of hydraulic fluid to the actuator is controlled by a specially designed hydraulic valve which includes a piston the displacement of which is regulated by controlling the pressure in a pressurized control chamber. The fluid pressure in the pressurized control chamber is regulated by a pair of electronically controlled fuel injector nozzles. The electronic circuitry which controls the two electronic fuel injector nozzles receives electronic inputs corresponding to the operating RPM of the engine, the desired engine operating RPM and engine throttle position.

대표청구항 ▼

An electronically controlled, hydraulically actuated precision governor for controlling the operating RPM of a diesel engine by repositioning the rack of the engine fuel injection pump in response to changes in engine RPM, said governor comprising: (a) a main chamber having first and second end surf

An electronically controlled, hydraulically actuated precision governor for controlling the operating RPM of a diesel engine by repositioning the rack of the engine fuel injection pump in response to changes in engine RPM, said governor comprising: (a) a main chamber having first and second end surfaces; (b) a piston slideably positionable about a neutral location within said main chamber and having first and second faces; (c) biasing means positioned between the first end surface of said chamber and the first face of said piston for biasing said piston toward the second end surface of said main chamber; (d) an unpressurized chamber positioned within said main chamber between the first end surface thereof and the first face of said piston; (e) a variable pressure control chamber positioned within said main chamber between the second end surface thereof and the second face of said piston; (f) an equilibrium pressure within said control chamber which defines said neutral location of said piston; (g) first electrically controllable valve means coupled to said control chamber and to a source of pressurized fluid for metering fuel into or out of said control chamber to regulate the pressure in said control chamber above or below said equilibrium pressure in response to a control signal to controllably displace said piston toward either the first or second end surfaces of said main chamber; (h) an inlet port positioned in said main chamber between the first and second faces of said piston and coupled to the source of pressurized fluid; (i) actuator means hydraulically coupled to said main chamber between the first and second faces of said piston for displacing the rack of the fuel injection pump in response to fluid presssure from said main chamber; (j) second valve means coupling said main chamber to said actuator means when said piston is not in said neutral location and conducting pressurized fluid from said inlet port to said actuator means to displace said actuator means in a first direction when said piston is displaced toward the first end surface of said main chamber and for displacing said actuator means in a second direction when said piston is displaced toward the second end surface of said main chamber; and (k) control means coupled to the rack of the fuel injection pump and to said first valve means, including (i) RPM sensor means for measuring the operating RPM of the engine and (ii) RPM command means for designating a selected engine operating RPM for generating the control signals which actuate said first valve means to displace said piston to reposition the rack of the fuel injection pump to maintain the selected engine operating RPM.