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A driver circuit, having boost and hold modes of operation, for a solenoid having a high and a low impedance coil wherein the coils are so situated such that their respective magnetic fields are additive and wherein the driver circuit is responsive to input metering pulse width signals and includes

A driver circuit, having boost and hold modes of operation, for a solenoid having a high and a low impedance coil wherein the coils are so situated such that their respective magnetic fields are additive and wherein the driver circuit is responsive to input metering pulse width signals and includes means for modifying the duration of each pulse width signal to generate a boost pulse signal to excite the low impedance coil in correspondence with the variations in the battery voltage. The driver circuit further includes means for permitting the current flowing through the low impedance coil into flow into a high impedance coil and means for regulating the value of current flowing therethrough at a determinable value. The driver circuit further includes means for reducing the current droop occurring upon the transition from the boost mode of operation to the hold mode of operation.

대표청구항 ▼

A driver circuit for a fuel injector, the driver circuit adapted to be connected to a voltage source and to receive input metering signals from an electronic control unit, for controlling the operation of a solenoid of the type having a plurality of coils situated so as to produce, when activated, a

A driver circuit for a fuel injector, the driver circuit adapted to be connected to a voltage source and to receive input metering signals from an electronic control unit, for controlling the operation of a solenoid of the type having a plurality of coils situated so as to produce, when activated, aiding magnetic fields, the driver circuit comprising: voltage regulator means connected to said voltage source for generating a regulated voltage; adaptive means, responsive to the metering signals for generating a pulse width boost signal that is variable in correspondence with fluctuations of the voltage level of said voltage source; first driver means, responsive to said boost signal, and connected to the first of said coils for causing current to flow therethrough; second driver means, responsive to said boost signal, and connected to the second of said coils for activating said second coil and for causing the current flowing through said first coil to flow through said second coil; and first means connected to said first or said second driver means for reducing current droop upon activation of said second coil.