Engine cranking system and method

Details Engine cranking system and method Engine cranking system and method

2011-06-21

2011-06-21

Cronin, Stephen K (Department: 3747)

Internal-combustion engines

Starting device

Condition responsive control of starting device

C290S03800C

Reexamination Certificate

active

07963264

ABSTRACT:
A vehicle has an engine, a starter motor, an energy storage system (ESS) for powering an auxiliary system, and a supercapacitor module for powering the starter motor during engine cranking and starting. The supercapacitor module disconnects from the starter motor to recharge. A DC-DC booster converter increases the level of voltage supplied from the ESS so as to charge the supercapacitor module to a relatively higher voltage level, such as approximately 125 to 140 percent of the voltage level supplied by the ESS. A method for preventing voltage sag in an auxiliary system of the vehicle includes disconnecting the supercapacitor module from the starter motor when the engine is running, and then charging the supercapacitor module using the ESS until a cranking support voltage equals a stored target voltage. A detected commanded cranking and starting of the engine causes the connection of the supercapacitor module to the starter motor.

REFERENCES:
patent: 5157267 (1992-10-01), Shirata et al.
patent: 5818115 (1998-10-01), Nagao
patent: 6325035 (2001-12-01), Codina et al.
patent: 7319306 (2008-01-01), Rydman et al.

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