System and control method for an engine having two types of fuel injectors
AssigneeFord Global Technologies, LLC
InventorsJoseph Norman Ulrey, Ross Dykstra Pursifull
Life of this patent
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Abstract
A reduced cost dual fuel injection system and method is described. Port fuel injectors and direct fuel injectors may be operated by using common injector drivers.
Claims25
A system for delivering fuel to a port of a cylinder and directly to said cylinder of an internal combustion engine, the system comprising:
- a first port injector for injecting fuel to a port of a first cylinder;
- a second port injector for injection fuel to a port of a second cylinder;
- a first direct injector for injecting fuel directly to said first cylinder;
- a second direct injector for injecting fuel directly to said second cylinder;
- and
- a controller configured to output a first command to actuate said first port injector to inject fuel to said first cylinder, said first command also acting to actuate said second direct injector to inject fuel to said second cylinder, and said controller also configured to output a second command to actuate said second port injector to inject fuel to said second cylinder, said second command also acting to actuate said first direct injector.
A method for controlling fuel port and direct fuel injectors configured to deliver fuel to a cylinder of an internal combustion engine, the method comprising:
- flowing a first current through a second direct injector to inject fuel to a second cylinder of an internal combustion engine by way of a first command;
- flowing a second current through a first port injector so that fuel is injected to a first cylinder of said internal combustion engine during at least a portion of the interval when said second direct injector is injecting fuel to said second cylinder, said second current flowing by way of said first command and a second command.
A method for controlling fuel port and direct fuel injectors configured to deliver fuel to a cylinder of an internal combustion engine, the method comprising:
- flowing a first current through a second direct injector to inject fuel to a second cylinder of an internal combustion engine by way of a first command;
- flowing a second current through a first port injector so that fuel is injected to a first cylinder of an internal combustion engine during at least a portion of the interval when said second direct injector is injecting fuel to said second cylinder, said second current flowing by way of said first command and a second command;
- and
- stopping said first current and injecting additional fuel to said first cylinder during the same cylinder cycle.
A method for controlling fuel port and direct fuel injectors configured to deliver fuel to a cylinder of an internal combustion engine, the method comprising:
- a first mode wherein a first current flows through a second direct injector to inject fuel to a second cylinder of an internal combustion engine by way of a first command, and wherein a second current flows through a first port injector so that fuel is injected to a first cylinder of said internal combustion engine during at least a portion of the interval when said second direct injector is injecting fuel to said second cylinder, said second current flowing by way of said first command and a second command;
- a second mode wherein said third current flows through said second direct injector to inject fuel to said second cylinder of said internal combustion engine by way of a third command, and wherein fuel in not injected by said first port injector during the cylinder cycle wherein said third current flows.
A circuit for operating a pair of direct fuel injectors configured to deliver fuel to a first and a second cylinder, and for operating a pair of port fuel injectors delivering fuel to said first and second cylinders, the circuit comprising:
- a first current path whereby current is sourced to first and second direct injectors that are capable of injecting fuel to two different cylinders;
- a second current path that may provide a current sinking capacity for said first direct injector and a second port fuel injector;
- a third current path that may provide a current sinking capacity for said second direct injector and a first port fuel injector;
- and
- first and second switches that close or open said second and third current paths to actuate or deactivate said first and second direct injectors and said first and second port fuel injectors.
Dependencies are inferred from the claim text.