Power supply control system for an electrically heated catalytic

Details Power supply control system for an electrically heated catalytic Power supply control system for an electrically heated catalytic

1997-09-10

1999-10-19

Look, Edward K.

Power plants

Internal combustion engine with treatment or handling of...

By means producing a chemical reaction of a component of the...

60300, 60303, 60286, F01N 300

Patent

active

059669314

ABSTRACT:
In the power supply control system, an electrically heated catalytic converter (EHC) is connected to an alternator output terminal via a switch SW1, and a battery is connected to the alternator via a switch SW2 in parallel with the EHC. A control unit (ECU) for controlling the operation of the switches SW1 and SW2 is provided. When the engine has started, the ECU turns on the SW1 and turns off the SW2 to supply electric power to the EHC directly from the alternator. After the EHC is heated to the activating temperature and starts its catalytic action, the ECU turns on both the switches SW1 and SW2 to supply electric power to the EHC from the battery to maintain the temperature of the EHC. Since the electric power for raising the temperature of the EHC is supplied in the condition where the battery is disconnected from the alternator, the output voltage can be increased to a value higher than a normal output voltage for charging the battery. Therefore, a relatively large electric power can be supplied to the EHC without imposing an excessive load on the battery.

REFERENCES:
patent: 5224335 (1993-07-01), Yoshizaki
patent: 5321231 (1994-06-01), Schmalzriedt et al.
patent: 5390493 (1995-02-01), Fujishita et al.
patent: 5404720 (1995-04-01), Laing
patent: 5444978 (1995-08-01), Yoshizaki et al.
patent: 5512789 (1996-04-01), Lyon
patent: 5689952 (1997-11-01), Kato et al.
patent: 5806307 (1998-09-01), Aoki et al.
patent: 5848530 (1998-12-01), Matsuoka et al.
SAE 941042, "Development of an Alternator-Powered Electrically-Heated Catalyst System", Paul M. Laing.
SAS 960342, "Study on Conformity Technology with ULEV Using EHC System", Yuichi Shimasaki, et al.
Copending U.S. Patent Application Serial No. 08/622,853, filed Jun. 12, 1996.

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