Electrical drive arrangement for a fuel injection system
View Patent ↗An electrical drive arrangement of a fuel injection system comprising a power supply operatively connected to an injector driver stage which, in turn, is operatively connected to at least one fuel injector. The electrical drive arrangement includes a voltage regulation device operatively connected between the power supply and the injector driver stage, wherein the voltage regulation device is arranged to regulate the voltage supply from the power supply to the injector driver stage.
1. An electrical drive arrangement of a fuel injection system comprising a power supply operatively connected to an injector driver stage which, in turn, is operatively connected to at least one fuel injector, and a voltage regulation device operatively connected between the power supply and the injector driver stage, wherein the voltage regulation device is arranged to regulate the voltage supplied from the power supply to the injector driver stage.
2. The electrical drive arrangement of claim 1 , wherein the voltage regulation device includes a field effect transistor connected between the power supply and the injector driver stage in a source follower configuration.
3. The electrical drive arrangement of claim 2 , wherein the voltage regulation device further includes an input terminal connected to the power supply and an output terminal connected to the injector driver stage and wherein the field effect transistor is interposed between the input terminal and the output terminal.
4. The electrical drive arrangement of claim 3 , wherein the field effect transistor includes a drain terminal connected to the input terminal of the voltage regulation device, a source terminal connected to the output terminal of the voltage regulation device, and a gate terminal.
5. The electrical drive arrangement of claim 4 , wherein a filter device is operatively connected between the gate terminal of the field effect transistor and the input terminal of the voltage regulation device, thereby supplying a filtered voltage (V filter ) from the power supply as an input to the gate terminal.
6. The electrical drive arrangement of claim 5 , wherein the filter device includes:
i) a resistor element connected between the gate terminal and the input terminal; and
ii) a capacitor element connected between the gate terminal and an electrical ground connection.
7. The electrical drive arrangement of claim 6 , wherein the value of the resistor element and/or the capacitor element are variable thereby providing a means to modify the frequency response of the filter device.
8. The electrical drive arrangement of claim 6 , including a load element connected between the source terminal and the electrical ground connection, the ohmic value of the load element being selected as a function of the on-state resistance of the field effect transistor.
9. The electrical drive arrangement of claim 6 , wherein a current sense element is connected between the capacitor element and the electrical ground connection, and wherein a feedback path is connected therebetween to provide a injector voltage signal to the gate terminal of the voltage regulation device.
10. The electrical drive arrangement of claim 6 , wherein the voltage regulation device includes a differential amplifier configured to amplify the voltage difference between the output voltage of the filter device and the voltage at the source terminal of the field effect transistor and supply an amplified output voltage to the gate terminal of the field effect transistor.
11. The electrical drive arrangement of claim 2 , wherein the field effect transistor is a metal oxide semiconductor field effect transistor or an N-channel metal oxide semiconductor field effect transistor.
12. An electrical drive arrangement of a fuel injection system comprising:
a power supply operatively connected to an injector driver stage which, in turn, is operatively connected to at least one fuel injector,
a voltage regulation device operatively connected between the power supply and the injector driver stage and having a gate terminal and an input terminal,
a filter device operatively connected between the gate terminal of the voltage regulation device and the input terminal, thereby supplying a filtered voltage (V filter ) from the power supply as an input to the gate terminal, wherein the filter device includes a resistor element connected between the gate terminal and the input terminal and a capacitor element connected between the gate terminal and an electrical ground connection.
13. The electrical drive arrangement of claim 12 , wherein the value of the resistor element and/or the capacitor element are variable thereby providing a means to modify the frequency response of the filter device.
14. The electrical drive arrangement of claim 12 , wherein a current sense element is connected between the capacitor element and the electrical ground connection, and wherein a feedback path is connected therebetween to provide a injector voltage signal to the gate terminal.
15. The electrical drive arrangement of claim 14 , wherein the voltage regulation device includes a differential amplifier configured to amplify the voltage difference between the output voltage of the filter device and the voltage at a source terminal of the voltage regulation device and supply an amplified output voltage to the gate terminal.
16. An electrical drive arrangement of a fuel injection system comprising:
a power supply operatively connected to an injector driver stage which, in turn, is operatively connected to at least one fuel injector,
a voltage regulation device operatively connected between the power supply and the injector driver stage and being arranged to regulate the voltage supplied from the power supply to the injector driver stage, and
a differential amplifier arranged to increase the voltage input to the voltage regulation device in response to an increased load applied to the injector driver stage.
17. The electrical drive arrangement of claim 16 , wherein the voltage regulation device comprises an input terminal connected to the power supply, an output terminal connected to the injector driver stage and a field effect transistor disposed therebetween including a drain terminal connected to the input terminal, a source terminal connected to the output terminal, and a gate terminal.
18. The electrical drive arrangement of claim 17 , wherein a filter device is operatively connected between the gate terminal of the field effect transistor and the input terminal of the voltage regulation device, thereby supplying a filtered voltage (V filter ) from the power supply as an input to the gate terminal.
19. The electrical drive arrangement of claim 18 , wherein the filter device includes: i) a resistor element connected between the gate terminal and the input terminal; and ii) a capacitor element connected between the gate terminal and an electrical ground connection.
20. The electrical drive arrangement of claim 19 , wherein the value of the resistor element and/or the capacitor element are variable thereby providing a means to modify the frequency response of the filter device.