Fuel injection circuit with selectable peak injection currents
First Claim
Patent Images
1. A method for charging a fuel injection coil including the steps of:
- charging an injection coil at a first level for a first period of time;
charging the injection coil at a second level lower than the first level for a second period of time subsequent to the first period of time; and
comparing a level of the coil with a reference and increasing the level of the coil based upon the comparison.
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Abstract
A charging circuit for a fuel injection coil enables the controller to selectively add a pulse of increased amplitude to the beginning of an injection current pulse. Optionally, the controller can also select one of a plurality of amplitudes for the pulse and control the duration of the pulse.
8 Citations
13 Claims
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1. A method for charging a fuel injection coil including the steps of:
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charging an injection coil at a first level for a first period of time; charging the injection coil at a second level lower than the first level for a second period of time subsequent to the first period of time; and comparing a level of the coil with a reference and increasing the level of the coil based upon the comparison. - View Dependent Claims (2, 3, 4)
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5. A method for charging a fuel injection coil including the steps of:
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charging an injection coil at a first level for a first period of time charging the injection coil at a second level lower than the first level for a second period of time subsequent to the first period of time and contiguous with the first period of time comparing a level of the coil with a reference and increasing the level of the coil based upon the comparison; decreasing the reference from the first time period to the second time period; selecting the level of the reference from among a plurality of predetermined available levels during the first time period; and selectively activating combinations of a plurality of switches to select the level of the reference. - View Dependent Claims (7, 8)
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6. A method for charging a fuel injection coil including the steps of:
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charging an injector coil at a first level for a first period of time; charging the injection coil at a second level lower than the first level for a second period of time subsequent to the first period of time and contiguous with the first period of time; comparing a level of the coil with a reference and increasing the level of the coil based upon the comparison; decreasing the reference from the first time period to the second time period; selecting the level of the reference from among a plurality of predetermined available levels during the first time period; and selectively altering a resistance in a voltage divider to select the level of the reference. - View Dependent Claims (9, 10)
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11. A charging circuit for a fuel injector coil comprising:
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a driver for selectively charging the coil at a normal level or at a higher level; a plurality of switches capable of being activated in multiple combinations by the driver; and a timer generating a pulse for a first period of time, the driver charging the coil at the higher level based upon the pulse and returning to the normal level after the pulse. - View Dependent Claims (12, 13)
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Specification