To securely reduce radio noise while minimizing the number of necessary common mode filters.
In an injector driver circuit, first and second drive transistors 1, 2 are connected between a buffer capacitor 5 and a ground, and a coil 4 for current limitation and a first winding 7 of a common mode choke coil 6 are connected in series between a junction point of the first and second drive transistors 1, 2 and a junction point of one ends of respective piezoelectric injectors 21-1 to 21-4. A second winding 8 of the common mode choke coil 6 and a resistor 10 for current detection are connected in series between sources of transistors 11 to 14 for selection connected to the other ends of the respective piezoelectric injectors 21-1 to 21-4 corresponding to drain and the ground.
COPYRIGHT: (C)2009,JPO&INPIT
| JP7435380 | injection control device |
Tomoyuki Kawano
Tatsunobu Horibe
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