skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Alternator control for battery charging

Abstract

In accordance with an aspect of the present disclosure, an electrical system for an automotive vehicle has an electrical generating machine and a battery. A set point voltage, which sets an output voltage of the electrical generating machine, is set by an electronic control unit (ECU). The ECU selects one of a plurality of control modes for controlling the alternator based on an operating state of the vehicle as determined from vehicle operating parameters. The ECU selects a range for the set point voltage based on the selected control mode and then sets the set point voltage within the range based on feedback parameters for that control mode. In an aspect, the control modes include a trickle charge mode and battery charge current is the feedback parameter and the ECU controls the set point voltage within the range to maintain a predetermined battery charge current.

Inventors:
; ; ;
Publication Date:
Research Org.:
FCA US LLC, Auburn Hills, MI (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1193295
Patent Number(s):
9,083,202
Application Number:
13/718,650
Assignee:
FCA US LLC (Auburn Hills, MI) DOEEE
DOE Contract Number:
EE0003347
Resource Type:
Patent
Resource Relation:
Patent File Date: 2012 Dec 18
Country of Publication:
United States
Language:
English
Subject:
25 ENERGY STORAGE; 33 ADVANCED PROPULSION SYSTEMS; 42 ENGINEERING

Citation Formats

Brunstetter, Craig A., Jaye, John R., Tallarek, Glen E., and Adams, Joseph B. Alternator control for battery charging. United States: N. p., 2015. Web.
Brunstetter, Craig A., Jaye, John R., Tallarek, Glen E., & Adams, Joseph B. Alternator control for battery charging. United States.
Brunstetter, Craig A., Jaye, John R., Tallarek, Glen E., and Adams, Joseph B. Tue . "Alternator control for battery charging". United States. doi:. https://www.osti.gov/servlets/purl/1193295.
@article{osti_1193295,
title = {Alternator control for battery charging},
author = {Brunstetter, Craig A. and Jaye, John R. and Tallarek, Glen E. and Adams, Joseph B.},
abstractNote = {In accordance with an aspect of the present disclosure, an electrical system for an automotive vehicle has an electrical generating machine and a battery. A set point voltage, which sets an output voltage of the electrical generating machine, is set by an electronic control unit (ECU). The ECU selects one of a plurality of control modes for controlling the alternator based on an operating state of the vehicle as determined from vehicle operating parameters. The ECU selects a range for the set point voltage based on the selected control mode and then sets the set point voltage within the range based on feedback parameters for that control mode. In an aspect, the control modes include a trickle charge mode and battery charge current is the feedback parameter and the ECU controls the set point voltage within the range to maintain a predetermined battery charge current.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Tue Jul 14 00:00:00 EDT 2015},
month = {Tue Jul 14 00:00:00 EDT 2015}
}

Patent:

Save / Share:
  • A battery to be charged is connected to the stator winding output terminals of a permanent magnet alternator by way of two half-wave rectifier circuits. Each rectifier circuit has at least one controlled rectifier in series with the battery. The controlled rectifiers have gate terminals, respectively, for supplying a signal that renders them conductive. A semiconductor isolating or shut off switch, preferably a transistor switch, connects the battery terminal to a voltage divider circuit that develops two discrete voltage levels that are proportional to battery voltage. A zener diode circuit fed from the battery provides a stable reference voltage. Amore » first comparator compares one of the voltages that corresponds with the battery voltage being a predetermined amount below full-charge condition with the zener reference voltage and if the reference voltage is exceeded, the comparator trips to turn on one of the SCR diode rectifiers for charging the battery at a relatively low rate with half-wave rectified dc. A second comparator compares a still lower voltage in the divider with the zener reference voltage and trips to effect turning on the other SCR diode to charge the battery additionally to the other SCR and the half-wave rectifier circuit in which it is connected. Thus, full wave charging occurs. If the battery is accidentally disconnected high voltage could develop on the alternator terminals. Disconnection turns off the isolating transistor and the controlled rectifiers lose their gating signals and turn off. High voltage across the alternator during the last half of the cycle before turn off is dissipated to ground by a zener diode.« less
  • Battery charging control methods, electric vehicle charging methods, battery charging apparatuses and rechargeable battery systems. According to one aspect, a battery charging control method includes accessing information regarding a presence of at least one of a surplus and a deficiency of electrical energy upon an electrical power distribution system at a plurality of different moments in time, and using the information, controlling an adjustment of an amount of the electrical energy provided from the electrical power distribution system to a rechargeable battery to charge the rechargeable battery.
  • A control apparatus is described for a vehicle generator means having an output voltage connected to a battery having a terminal voltage and an electric load connected across the generator means output voltage and the battery terminal voltage. The control apparatus consists of in combination: voltage regulating means for controlling the output voltage of the generator means to a predetermined regulated value in accordance with a reference voltage value; coupling means providing a signal representing an operating state; reference voltage generating means for producing a substantially uniform reference voltage value supplied to the voltage regulating means in the absence ofmore » the signal from the coupling means, and for producing a gradually decreasing reference voltage value in response to the signal from the coupling means for gradually decreasing the output voltage of the generator means upon the occurrence of the operating state from a higher regulated value to a value less than the battery terminal voltage value; and circuit means connecting the output voltage of the generator means across the electric load while the generator means output voltage value remains below the battery terminal voltage value and the battery terminal voltage remains across the electric load to provide power to the load.« less
  • A voltage controlled flyback converter used as a battery charging circuit avoids the power dissipation of the more conventional series-type regulator-type charging circuits but cannot be readily utilized because of the high gain in the feedback loop due to the battery voltage, which causes instabilities therein when it is operated in a continuous current mode. These instabilities are avoided in a flyback converter used for battery charging by using current control techniques to control current on the primary side of the converter during high-rate battery charging. During low-rate charging, normal voltage feedback from an output current sensing resistor is usedmore » as long as the converter operates in a discontinuous mode.« less