Methods for eliminating power drainage in power sources used with starter-generators

Abstract

Methods for eliminating inadvertent power drain from an electrical power source coupled to a starter-generator. In one embodiment, a multiple-position key switch and bypass rectifier configuration is implemented. The multiple-position key switch is coupled to the power source. The key switch's start terminal is coupled to a solenoid for starting, while a bypass rectifier is coupled in parallel to the solenoid to provide a circuit path for recharging the electrical power source. When either a closed-in-neutral gear shift switch is open or the key switch is in a run/accessory power position, the solenoid is de-energized. This leaves the bypass rectifier as the remaining circuit path through which the power source is recharged. The bypass rectifier allows current flow in a single direction, thereby preventing discharge of the power source.

What is claimed is:  
     
         1 . A method of starting an engine with a first switch, the method comprising: 
 turning the first switch to a starting position;    energizing a second switch using an electrical power source;    closing the second switch;    energizing a starter-generator;    turning the first switch to a running position; and    charging the electrical power source using the starter-generator.    
     
     
         2 . A method as in  claim 1 , further comprising keeping a transmission in a neutral position.  
     
     
         3 . A method of controlling a starter-generator using a first switch, the method comprising: 
 providing a circuit path from a battery to the first switch;    providing a switched circuit path from a shifter to the first switch;    energizing a second switch by moving the first switch to a predetermined position;    providing current from the battery through the second switch to the starter-generator; and    providing a rectified circuit path from the starter-generator to the battery.    
     
     
         4 . A method of controlling a starter-generator as claimed in  claim 3 , the method further comprising de-energizing the second switch by moving the key switch to a second predetermined position.  
     
     
         5 . A method of controlling a starter-generator as claimed  claim 3 , the method further comprising configuring the rectified circuit path and the second switch in parallel.  
     
     
         6 . A method of controlling a starter-generator as claimed  claim 3 , the method further comprising de-energizing the second switch by opening the switched circuit path.  
     
     
         7 . A method of controlling electrical power drainage of a starter-generator circuit, the method comprising: 
 providing a bypass rectifier for charging an electrical power source;    providing a multiple position switch for de-energizing a solenoid; and    providing a shifter-controlled switch for de-energizing a solenoid.