Motor vehicle electrical system including a combined starter/generator

Patent · Tue Aug 04 04:00:00 EDT 1987

OSTI ID:6043033

Radomski, T A

This patent describes a motor vehicle including an engine and a starter/generator which is adapted to crank the engine during a starting mode before the engine has been started, and to be driven by the engine for generating electric current during a generating mode after the engine has been started, a system of electrical distribution comprising: a lower storage battery for supplying relatively low voltage operating current to low voltage vehicle electrical loads, and an upper storage battery operative with the lower storage battery to supply relatively high voltage electrical current to the starter/generator during starting mode and to other high voltage vehicle electrical loads; charging control means connecting the starter/generator to the lower and upper storage batteries during the generating mode, such that the starter/generator supplies power solely to the lower battery when the engine speed is lower than a reference speed below which the output voltage of the starter/generators is limited, and to the serial combination of the upper and lower batteries when the engine speed is at least as great as the reference speed for battery charging; and charge equalizing means including an energy storage inductor connected to the junction of the upper and lower batteries, and converter means.

• Assignee: General Motors Corp., Detroit, MI
• Patent Number(s): US 4684814
• OSTI ID: 6043033
• Country of Publication: United States
• Language: English

Related Subjects

33 ADVANCED PROPULSION SYSTEMS
330300 -- Advanced Propulsion Systems-- Electric-Powered Systems
330603* -- Vehicle Design Factors-- Engine System
BATTERY CHARGING
CURRENTS
ELECTRIC BATTERIES
ELECTRIC COILS
ELECTRIC CURRENTS
ELECTRIC GENERATORS
ELECTRIC POTENTIAL
ELECTRICAL EQUIPMENT
ELECTROCHEMICAL CELLS
ENGINES
EQUIPMENT
IGNITION SYSTEMS
INDUCTION
SOLENOIDS
VEHICLES
VELOCITY