초록 ▼

A switching type control unit (20) for activating fuel injectors (50) of an internal combustion engine. The control unit (20) including a plurality of switching circuits (60) for turning on and off associated hybrid power circuits (80). The hybrid power circuits (80) communicate the increased level

A switching type control unit (20) for activating fuel injectors (50) of an internal combustion engine. The control unit (20) including a plurality of switching circuits (60) for turning on and off associated hybrid power circuits (80). The hybrid power circuits (80) communicate the increased level of voltage generated by a single boost voltage generator (70) to particular injectors (50).

대표청구항 ▼

A solenoid control unit (20) for controlling the operation of at least one fuel injector (50) of an engine, each injector (50) of the type having a coil (52), the solenoid control unit (20) responsive to metering signals generated by an electronic control unit (40) in response to at least one engine

A solenoid control unit (20) for controlling the operation of at least one fuel injector (50) of an engine, each injector (50) of the type having a coil (52), the solenoid control unit (20) responsive to metering signals generated by an electronic control unit (40) in response to at least one engine parameter, and wherein each fuel injector (50) has associated therewith a sense means such as a resistor (52) for generating a voltage indicative of the current flowing within a particular injector (50), the solenoid control unit (20) comprising: switching circuit means (60), one associated with each injector (50) adapated to receive a particular one of the metering pulses and communicated to a particular sense resistor (54) comprising: pull-in signal generating means (62) for generating a pull-in signal in response to a received metering pulse; on/off switch control means (90) for generating an on-control signal during intervals when the current of its corresponding injector is below a predetermined value and for generating an off-control signal when the injector current is above a predetermined value; a voltage source network means (280) responsive to the pull-in signal for generating a first current reference level signal during the interval that the pull-in signal is present and for generating a second voltage level reference signal of lower magnitude during the interval thereafter; pulsed switching type boost voltage generator means (70) responsive to said pull-in signal for generating and for storing a boost voltage signal in excess of the voltage established by a battery in synchronism with the generation of the pull-in pulse; and hybrid power circuit means (80), one associated with each injector (50) and responsive to the boost voltage signal, the on-control signal and the off-control signal for communicating to the injector (50) the boost voltage signal or battery potential in response to the on-control signal and for connecting the injector to a degeneration or recirculation circuit to permit the injector current to decay in response to the receipt of the off-control signal.