System for supplying power to an electrically heated catalyst

Details System for supplying power to an electrically heated catalyst System for supplying power to an electrically heated catalyst

1992-01-24

1994-06-14

Paschall, Mark H.

Electric heating

Heating devices

With power supply and voltage or current regulation or...

219486, 219485, 219202, 219206, 219509, 307 16, 322 90, H05B 102, B60L 102

Patent

active

053212312

ABSTRACT:
An electrical system for supplying power to an electrical resistive heater that heats the catalyst of a catalytic converter. The electrical system includes an alternating current generator that has an output winding and a field winding that is carried by the rotor of the generator. The rotor is driven by an engine on a motor vehicle. The motor vehicle loads, including a storage battery are supplied with current by a first bridge rectifier that is connected to the output winding of the generator. The resistive catalyst heater is supplied with current by a circuit that includes a step-up transformer connected between the output winding of the generator and a second bridge rectifier that feeds the heater. The system can be operated in a high power mode for supplying a higher level of power to the heater. In the high power mode, the motor vehicle loads and battery are disconnected from the first bridge rectifier while still allowing the battery to supply current to the electrical loads, a voltage regulating means for controlling field current is disabled and the field winding is supplied with a predetermined current and the engine idle speed is increased. The output voltage of the second bridge rectifier is controlled as a function of the temperature of the catalyst and the output voltage of the second bridge rectifier can be pulse-width modulated.

REFERENCES:
patent: 4692684 (1987-09-01), Schaeffer
patent: 4780619 (1988-10-01), Campbell et al.
patent: 4884018 (1989-11-01), Meuret et al.
patent: 4950972 (1990-08-01), Berg
patent: 4967137 (1990-10-01), Cantrot et al.
patent: 4976929 (1990-12-01), Correlison et al.
patent: 5068589 (1991-11-01), Offiler et al.

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