System and method of compensating for injector variability
First Claim
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1. A method of calibrating an electronically controlled fuel injector, the method comprising the steps of:
- establishing reference energizing times which correspond to fuel injection at each of at least two predetermined engine conditions;
determining true energizing times for the injector which correspond to fuel injection at each of the predetermined engine conditions;
selecting one of a plurality of predetermined calibration categories for each engine condition based on each true energizing time relative to the corresponding reference energizing time;
assigning a calibration code to the injector indicative of the calibration categories; and
marking the injector with the calibration code.
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Abstract
Electronically controlled fuel injectors are capable of complex injection control methods, such as split injection. A calibration code assigned to each injector is used by a logic controller to determine calibrated energizing times based on raw energizing times determined by the engine control unit. Each injector may be individually calibrated to compensate for injector variability, and facilitate balanced power output from each cylinder.
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Citations
20 Claims
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1. A method of calibrating an electronically controlled fuel injector, the method comprising the steps of:
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establishing reference energizing times which correspond to fuel injection at each of at least two predetermined engine conditions; determining true energizing times for the injector which correspond to fuel injection at each of the predetermined engine conditions; selecting one of a plurality of predetermined calibration categories for each engine condition based on each true energizing time relative to the corresponding reference energizing time; assigning a calibration code to the injector indicative of the calibration categories; and marking the injector with the calibration code. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A system for compensating for injector variability of an electronically controlled fuel injector, the system comprising:
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an internal combustion engine having a plurality of electronically controlled fuel injectors each having an associated calibration code based on first and second pluralities of calibration categories corresponding to deviation of true energizing times of the injector relative to reference energizing times at first and second engine operating conditions; a logic controller in communication with the plurality of injectors, the logic controller determining a raw energizing time corresponding to current engine operating conditions for each injector, and computing a calibrated energizing time based on the calibration code for the injector using linear interpolation between energization times associated with the first and second calibration categories. - View Dependent Claims (14)
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15. A system for compensating for injector variability in electronically controlled fuel injectors in an internal combustion engine, the system comprising:
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a plurality of fuel injectors, at least one of the injectors having a calibration code based on true energizing times relative to reference energizing times for each of a plurality of predetermined engine conditions; and an electronic control unit which determines raw energizing times for the injectors based on current engine operating conditions determines calibrated energizing times for the at least one injector by linearly interpolating between energizing times associated with the respective calibration code and corresponding calibration categories, and energizes each injector for the calibrated energizing time. - View Dependent Claims (16, 17, 18)
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19. A computer readable storage medium having stored therein data representing instructions executable by a microprocessor to compensate for fuel injector variability during control of an internal combustion engine, the computer readable storage medium comprising:
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instructions for determining a raw energizing time for a fuel injector; instructions for determining a calibration code for the injector; instructions for determining a first calibration category corresponding to true energizing time of the injector relative to a first reference energizing time for a first engine operating condition and a second calibration category corresponding to true energizing time of the injector relative to a second reference energizing time for a second engine operating condition; and instructions for determining a calibrated energizing time for the injector based on the raw energizing time and the first and second calibration categories. - View Dependent Claims (20)
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Specification