Method of delivering a diffuse duty cycle

Details Method of delivering a diffuse duty cycle Method of delivering a diffuse duty cycle

1998-09-30

2000-02-22

Ramirez, Nestor

Electricity: single generator systems

Generator control

With excitation winding and/or circuit control

H02P 910

Patent

active

060284161

ABSTRACT:
A method for controlling the duty cycle of a pulse width modulated (PWM) output signal applied to a field winding of an alternator of a motor vehicle. The PWM signal is generated from a controller associated with a vehicle engine to control the output current from a vehicle alternator during engine operation. The method involves determining a desired duty cycle for the PWM signal to be applied to the field winding of the alternator. The method then involves determining the PWM signal's "ON" and "OFF" pattern to deliver the desired duty cycle. This is accomplished by adding the value corresponding to the desired duty cycle to a running sum value. The PWM signal to the alternator is turned "ON" if the new running sum value exceeds or is equal to 100. One-hundred is then subtracted from the running sum value before it is stored. However, if the new running sum value is less than 100, then the PWM signal is turned "OFF" and the new running sum value is then stored without subtracting 100. On the next cycle, the desired duty cycle is again added to the presently stored running sum value to produce a new value which is again checked to determine if it is greater than or equal to 100, and the above steps are repeated. The method provides better control over the duty cycle of the PWM signal which contributes to a more steady-state output of the alternator and better response to brief electrical impulses experienced by the alternator as a result of activation of various electrical subsystems of a vehicle at low engine idle speeds.

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