Control system for a power supply changeover switch

Details Control system for a power supply changeover switch Control system for a power supply changeover switch

1997-09-15

1999-11-30

Elms, Richard T.

Electrical transmission or interconnection systems

Vehicle mounted systems

Automobile

60300, 219205, F01N 310

Patent

active

059947870

ABSTRACT:
In the control system for a power supply changeover switch, a battery and an electrically heated catalytic converter (EHC) are connected to an alternator in a parallel arrangement via a changeover switch. The changeover switch selectively takes either of a first position where the battery is connected to the alternator and a second position where the EHC is connected to the alternator. An electronic control unit (ECU) is provided for controlling the changeover switch and the alternator. When the changeover switch is to be switched between the first and the second position, the ECU first terminates the power generation of the alternator and, then, performs the switching of the changeover switch 25 after the electric current flowing through the changeover switch 25 decreases to a sufficiently low value. Since the switching of the changeover switch 25 is performed always in the condition where the electric current flowing through the changeover switch is low, a failure of the changeover switch 25 such as welding of the contacts in the switch caused by cutting off a large electric current does not occur.

REFERENCES:
patent: 4084126 (1978-04-01), Clements
patent: 5404720 (1995-04-01), Laing
patent: 5512789 (1996-04-01), Lyon
SAE 941042, "Development of an Alternator-Powered Electrically-Heated Catalyst System", Paul M. Laing. (May 1994).
SAE 960342, "Study on Conformity Technology with ULEV EHC System", Yuichi Shimasaki, et al. (Date unknown).

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