Gm Global Technolgoy Operations, Inc.

Marvin E Carpenter

David W Walters

Nick S Kapsokavathis

Edward Harold Schmidt

A regulator voltage control includes measuring a current of a battery, determining a state of charge (SOC) of the battery based on the current, and determining a nominal optimum charging voltage as a function of the SOC of the battery. The nominal optimum charging voltage is converted to a % duty cycle, and a generator is operated relative to the % duty cycle for charging the battery. The nominal optimum charging voltage is reduced when either a battery charge current is below a predetermined value, or a current drawing accessory is turned on.

Battery voltage reduction

A microprocessor based fuel control for automotive vehicle engines samples the measured air flow rate at fixed intervals and calculates the air mass flow for a cylinder interval which varies with engine speed. A sensor on the engine detects cylinder position for the cylinder interval determination. An independent clock controls the air flow rate sampling periods. During each cylinder interval the air flow rate is integrated for each whole sampling period and is approximated for each partial period at the boundaries of the cylinder interval. The results are summed to obtain the mass air flow for the cylinder interval.

Growing community of inventors

Clarkston, MI, United States of America

Marvin E Carpenter