Method and device for driving an injector in an internal combustion engine
AssigneeMagneti Marelli Powertrain S.p.A.
InventorsPaolo Marceca, Luca Poggio, Michele Cagnoni, Piero Carbonaro, Andrea Nepote
Life of this patent
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Abstract
A method and device for driving an injector in an internal combustion engine in which a current wave which is variable over time, which comprises an initial section substantially of a pulse type and having a relatively high current intensity, an intermediate section during which the current intensity is rapidly reduced to substantially zero values and a final section having a substantially constant and relatively low current intensity, is caused to circulate through a control circuit of the injector.
Claims13
A method for driving an injector (2) in an internal combustion engine (3), in which method a current wave (Iinj) which is variable over time, which comprises an initial section (T1, T2, T3) having a relatively high current intensity (Iinj) and a subsequent final section (T5) having a relatively low current intensity (Iinj), is caused to circulate through a control circuit (4) of the injector (2), the method being characterised in that the current wave (Iinj) comprises an intermediate section (T4) between the first and second sections (T1, T2, T3;
- T5) during which the current intensity (Iinj) is rapidly reduced to substantially zero values;
- the current intensity (Iinj) being maintained substantially constant and equal to a first predetermined value (Im) during the final section (Tb) by applying a first and second voltage value, different from one another, cyclically to the control circuit (4) of the injector (2).
A method for driving an injector (2) in an internal combustion engine (3), in which method a current wave (Iinj) which is variable over time, which comprises an initial section (T1, T2, T3) having a relatively high current intensity (Iinj) and a subsequent final section (T5) having a relatively low current intensity (Iinj), is caused to circulate through a control circuit (4) of the injector (2);
- the current wave (Iinj) comprising an intermediate section (T4) between the first and second sections (T1, T2, T3;
- T5) during which the current intensity (Iinj) is rapidly reduced to substantially zero values;
- the control circuit (4) of the injector (2) being driven by means of a first voltage (Vtank) during the initial section (T1, T2, T3) and the control circuit (4) of the injector (2) being driven by a second voltage (Vbatt), which is substantially equal to the battery voltage and is lower than the first voltage (Vtank), during the final section (T5);
- the first voltage (Vtank) being generated by a d.c.—d.c. converter from the battery voltage.
A method for driving an injector (2) in an internal combustion engine (3), in which method a current wave (Iinj) which is variable over time, which comprises an initial section (T1, T2, T3) having a relatively high current intensity (Iinj) and a subsequent final section (T5) having a relatively low current intensity (Iinj), is caused to circulate through a control circuit (4) of the injector (2);
- the current wave (Iinj) comprising an intermediate section (T4) between the first and second sections (T1, T2, T3;
- T5) during which the current intensity (Iinj) is rapidly reduced to substantially zero values;
- the control circuit (4) of the injector (2) being driven by means of a first voltage (Vtank) during the initial section (T1, T2, T3) and the control circuit (4) of the injector (2) being driven by a second voltage (Vbatt), which is substantially equal to the battery voltage and is lower than the first voltage (Vtank), during the final section (T5);
- the first voltage (Vtank) being between 60 and 90V, while the second voltage (Vbatt) being substantially equal to 12V.
A method for driving an injector (2) in an internal combustion engine (3), in which method a current wave (Iinj) which is variable over time, which comprises an initial section (T1, T2, T3) having a relatively high current intensity (Iinj) and a subsequent final section (T5) having a relatively low current intensity (Iinj), is caused to circulate through a control circuit (4) of the injector (2);
- the current wave (Iinj) comprising an intermediate section (T4) between the first and second sections (T1, T2, T3;
- T5) during which the current intensity (Iinj) is rapidly reduced to substantially zero values;
- a positive voltage and a zero voltage being alternately applied to the control circuit (4) during the initial and final sections (T1, T2, T3, T5), and a negative voltage being applied to the control circuit (4) during the intermediate section (T4).
Dependencies are inferred from the claim text.