Fuel delivery control arrangement
AssigneeThe Bendix Corporation
InventorDouglas A. Luscomb
Life of this patent
Estimating the term…
Abstract
A valving arrangement is disclosed for varying the quantity and timing of fuel injections of a jerk pump (10) associated with an internal combustion engine. The arrangement consists of a bypass valve (40) in communication with the injection chamber (22) of the jerk pump (10) which produces a controlled bypass of fuel rather than being delivered through the injector delivery valve (42) to the engine cylinders. The bypass valve (40) in turn is controlled by a solenoid-operated three-way pilot valve (88) which causes pressurizing or venting of an operating chamber (84) adjacent a bypass valve operator piston (80). The three-way pilot valve (88) in turn is controlled by the fuel system electronic controls (98) to control the timing and volume of fuel charge delivered by the jerk pump (10) in each injection cycle.
Claims14
A jerk pump assembly for an internal combustion engine of the type including at least one engine cylinder, at least one corresponding fuel injector nozzle associated with said at least one cylinder to direct the injection of fuel charges into said engine cylinder, said jerk pump assembly including:
- a housing having a bore therein;
- a plunger mounted for reciprocating movement in said bore;
- an injection chamber defined by the space between said bore and said plunger;
- means for periodically receiving and directing fuel into said injection chamber;
- delivery valve means for periodically discharging fuel from said injection chamber upon development of a predetermined pressure in said injection chamber;
- means for controlling the pressure in said injection chamber to control the delivery valve means and the discharge of fuel from said injection chamber, said control means comprising:
- means for establishing and disestablishing outflow from said injection chamber to control the opening and closing of said delivery valve means, said means including:
- a bypass valve having a valve member and a valve seat, each having corresponding mating surfaces, said valve member being movable between an open position and a closed position against said valve seat mating surface to stop and start the outflow of fuel from said injection chamber in correspondence with said open and closed positions of said bypass valve member;
- and
- operating means acting on said bypass valve means to alternately position said valve member in said open and closed position, said operating means including operator piston means moving together with said valve member and extending from said mating surface of said valve member and configured to establish a hydraulic balance of said pressure in said injection chamber acting on said valve member;
- pilot valve means for controllably applying a fluid pressure on said operator piston means creating a force tending to cause said movement of said valve member, and means acting on said valve member opposing said fluid pressure force to thereby enable said movement of said valve member between said open and closed positions;
- whereby establishing or disestablishing outflow from the injection chamber and the discharge of fuel from the injection chamber into an engine cylinder.
In an improved fuel injector arrangement for use in an internal combustion engine, said injector arrangement of the type having a housing having a bore formed therein, a plunger mounted for reciprocation in said bore, an injection chamber defined by a space between said plunger and said bore, means for receiving and directing fuel to said injection chamber to be pressurized by said reciprocation of said plunger in said barrel bore, and means for discharging pressurized fuel from said injection chamber when fuel therein reaches a predetermined pressure, the improvement comprising:
- bypass valve means for controlling the pressure developed in said injection chamber including a valve member and a valve seat, said valve member having an open position with respect to said valve seat for discharging fuel from said injection chamber, thereby reducing the pressure of any fuel in said injection chamber and a closed position with respect to said valve seat for preventing the discharge of fuel from said injection chamber thereby allowing the pressure of fuel in said injection chamber to increase;
- and operating means to alternately position said valve member in said open and closed position, said operating means including operator piston means moving together with said valve member and extending from said mating surface of said valve member and configured to establish a hydraulic balance of said pressure in said injection chamber acting on said valve member;
- pilot valve means for controllably applying a fluid pressure on said operator piston means creating a force tending to cause said movement of said valve member, and means acting on said valve member opposing said fluid pressure force to thereby enable said movement of said valve member between said open and closed positions.
Dependencies are inferred from the claim text.