Internal-combustion engines – High tension ignition system – Current or voltage sensing in coil primary
Patent
1998-05-22
1999-10-19
Argenbright, Tony M.
Internal-combustion engines
High tension ignition system
Current or voltage sensing in coil primary
123651, F02P 305, F02P 3055
Patent
active
059671289
ABSTRACT:
According to the invention, a primary winding of an ignition coil is coupled with an insulated-gate bipolar transistor (IGBT). The IGBT is controlled by a current restriction circuit, which includes a control transistor for performing the on-off operation of the IGBT such that the IGBT is made conductive upon occurrence of an ignition control signal, and nonconductive, when a primary current of the ignition coil reaches a certain value depending on a reference voltage determined by a bias circuit. The bias circuit has a condenser, which is charged by a base current of the control transistor to change the base potential of the transistor slowly, when the transistor is made nonconductive.
REFERENCES:
patent: 5500619 (1996-03-01), Miyasaka
patent: 5664550 (1997-09-01), Ito et al.
patent: 5723916 (1998-03-01), Disney et al.
patent: 5775310 (1998-07-01), Ito et al.
Fukatsu Katsuaki
Ito Takashi
Kobayashi Ryoichi
Onuki Hiroshi
Sugiura Noboru
Argenbright Tony M.
Hitachi, Ltd. & Hitachi Car Engineering Co.
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