Method of determining transition from starter to alternator function by monitoring battery voltage or current
View Patent ↗The present invention is directed to determining and controlling the appropriate moment at which a combined starter/alternator should transition from start-up mode to alternator/generator mode following an IC engine start-up sequence. The method relies on battery voltage or battery current monitoring to establish the timing of the transition.
1. An automated method of controlling a starter/alternator in a start-up sequence of an IC engine driven generating system including a battery and a starter/alternator controller, said starter/alternator controller performing the automated method comprising the steps of:
detecting a first value of a battery electrical characteristic;
initiating a start-up sequence of said IC engine by signaling said starter/alternator to operate in starter mode;
detecting a second and third value of said battery electrical characteristic as said start-up sequence is proceeding, said second value indicating an engine cranking condition and said third value indicating an engine running condition prior to cessation of said starter/alternator operating in starter mode;
comparing said first, second, and third detected battery characteristic values; and,
signaling said starter/alternator to cease operation in starter mode and, immediately thereafter, transition to alternator/generator mode when said second detected value is between said first and third detected values.
2. A method as in claim 1 , wherein:
said battery electrical characteristic is voltage, and said first detected value is the highest of said first, second and third detected values.
3. A method as in claim 1 , wherein:
said battery electrical characteristic is current, and said first detected value is the lowest of said first, second and third detected values.
4. An automated method of controlling a starter/alternator in a start-up sequence of an IC engine driven generating system including a battery and a starter/alternator controller, said starter/alternator controller performing the automated method comprising the steps of:
detecting a first value of battery voltage V 0 ;
initiating a start-up sequence of said IC engine by signaling said starter/alternator to operate in starter mode;
detecting a second and third value of said battery voltage V 1 and V 2 respectively as said start-up sequence is proceeding V 1 being indicative of an engine cranking condition and V 2 being indicative of an engine running condition prior to cessation of said starter/alternator operating in starter mode;
comparing said first, second, and third detected battery voltages; and,
signaling said starter/alternator to cease operation in said starter mode and, immediately thereafter, transition to alternator/generator mode when V 1 <V 2 <V 0 .
5. An automated method of controlling a starter/alternator in a start-up sequence of an IC engine driven generating system including a battery and a starter/alternator controller, said starter/alternator controller performing the automated method comprising the steps of:
detecting a first value of battery current I 0 ;
initiating a start-up sequence of said IC engine by signaling said starter/alternator to operate in starter mode;
detecting a second and third value of said battery current I 1 and I 2 respectively as said start-up sequence is proceeding, I 1 being indicative of an engine cranking condition and I 2 being indicative of an engine running condition prior to cessation of said starter/alternator operating in starter mode;
comparing said first, second, and third detected battery currents; and,
signaling said starter/alternator to cease operation in starter mode and, immediately thereafter, transition to alternator/generator mode when I 0 <I 2 <I 1 .