Electrical transmission or interconnection systems – Vehicle mounted systems – Automobile
Patent
1994-07-05
1996-04-30
Shoop, Jr., William M.
Electrical transmission or interconnection systems
Vehicle mounted systems
Automobile
219205, 60300, 320 48, F01N 310
Patent
active
055127894
ABSTRACT:
A control for electrically heated catalysts in a motor vehicle catalytic converter governs a switch for alternatively coupling an alternator output to the motor vehicle battery and a heating element of the catalytic converter. The control monitors electrical power delivered to the catalytic converter, preferably as a function of engine speed, field current and alternator output voltage, to infer actual temperature and compare it with the desired temperature at which the electrically heated catalyst is intended to operate. The control also preferably includes a field current adjuster to improve the power output to the catalytic converter when the switch couples the alternator output to the electrically heated catalyst. A switch actuator responsive to detection of the power delivered to the catalytic converter at a predetermined threshold actuates a switch to return the alternator to a charging connection with the vehicle battery. The power monitor also serves to adjust the field current delivered to the alternator to avoid the application of excessive charging voltage to the battery.
REFERENCES:
patent: 5257501 (1993-11-01), Wataya
patent: 5265418 (1993-11-01), Smith
patent: 5404720 (1995-04-01), Laing
Abolins Peter
Elms Richard T.
Ford Motor Company
May Roger L.
Shoop Jr. William M.
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