초록 ▼

A dual voltage motor vehicle electrical system comprising series connected cranking and accessory batteries that are used to energize an electric vehicle engine cranking motor. The accessory battery is charged by a vehicle engine driven generator and the cranking battery is charged by a battery char

A dual voltage motor vehicle electrical system comprising series connected cranking and accessory batteries that are used to energize an electric vehicle engine cranking motor. The accessory battery is charged by a vehicle engine driven generator and the cranking battery is charged by a battery charging circuit having an input connected to the accessory battery and an output connected to the cranking battery. The battery charging circuit is maintained in operation for a period of time after shut down of the engine to charge the cranking battery from the accessory battery. The battery charging circuit includes an inductance coil for transferring energy between the accessory and cranking batteries which may take the form of an actuating coil of a magnetic switch the contacts of which disconnect the accessory battery from an electrical load when the actuating coil is deenergized.

대표청구항 ▼

A dual voltage motor vehicle electrical system comprising in combination, first and second series connected batteries for supplying an electrical engine cranking motor with a voltage corresponding to the sum of the voltages of the batteries, at least one of said batteries being connected to supply a

A dual voltage motor vehicle electrical system comprising in combination, first and second series connected batteries for supplying an electrical engine cranking motor with a voltage corresponding to the sum of the voltages of the batteries, at least one of said batteries being connected to supply at least one other electrical load with a lower voltage corresponding to its terminal voltage, a voltage regulated direct voltage generating means driven by the engine of the vehicle, conductor means connecting the output terminals of said generating means to the terminals of said first battery whereby said first battery is charged by said generating means, a control means having an input connected to said conductor means and an output connected to the terminals of said second battery for charging said second battery from the voltage applied to said conductor means, said control means including means for varying the charging current supplied to said second battery as a function of the terminal voltage of said second battery, and means for maintaining said control means in operation for a predetermined time period following shut down of said engine to charge said second battery from said first battery for said time period.