Motor vehicle warm-up and battery charger system

Claim 1

A warm-up and battery charger system for a motor vehicle having an engine with a jacket containing a coolant, a heater coupled to the jacket for receiving coolant passing between the heater and jacket, a blower for the heater, and a battery; said system comprising a circulation tank-type coolant heater arranged for heating the coolant in the engine, a battery charger on the vehicle, an input socket defining input terminals on the vehicle for supplying AC power, a battery charger on the vehicle connected to the input terminals for converting from AC power to DC power, and power control circuit means on the vehicle having A first power circuit connected between the input terminals and the engine heater and including a first set of normally closed relay contacts, a second power circuit connected between the input terminals and the battery charger, a third power circuit between the battery charger and the battery and blower motor including a second set of normally open relay contacts leading to the battery and third and fourth sets of normally open relay contacts leading to the battery and blower, said third and fourth sets of contacts connected between the battery charger and the battery and said third set of contacts connecting through said second set to the blower, a fourth power circuit connected between the battery and a coil associated with each of said relay contacts, the relay coils of said first set and second sets of contacts being connected in parallel with one another, and a selector switch on the vehicle having a first and second set of switch contacts connected in said fourth circuit to alternately energize the coils of said first and second sets of relay contacts to charge the battery only in one mode of operation and alternately energize coils of said third and fourth sets of relay contacts to simultaneously charge the battery and energize said blower and said engine heater, and a thermostat switch in the vehicle connected in the fourth circuit in series with the relay coil for said third and fourth sets of contacts to automatically control the charging of the battery and regulate energization of the blower within selected temperature ranges within the vehicle.