Vehicle alternator and methods for controlling torque loading of the vehicle alternator on an engine
View Patent ↗A vehicle alternator and methods for controlling an amount of torque loading of the vehicle alternator on an engine are provided. The vehicle alternator utilizes a voltage regulator with a microprocessor to control an amount of torque loading, based on a rotational speed of a rotor of the alternator, or an amount of current output by the alternator, or both.
1. A method for controlling an amount of torque loading of a vehicle alternator on an engine, the alternator having a rotor, a stator, and a voltage regulator, the voltage regulator having a microprocessor, the method comprising:
determining a first value indicative of a rotational speed of the rotor at the first time, utilizing the microprocessor in the voltage regulator;
determining a second value indicative of an amount of current being output by the stator of the alternator at substantially the first time, utilizing the microprocessor;
determining a first torque loading value that is indicative of a relative amount of torque loading associated with the alternator, based on first and second values, utilizing the microprocessor;
determining a third value indicative of a rotational speed of the rotor at a second time, utilizing the microprocessor, the second time being after the first time;
determining a fourth value indicative of an amount of current being output by the stator of the alternator at substantially the second time, utilizing the microproccessor;
determining a second torque loading value that is indicative of the relative amount of torque loading associated with the alternator, based on third and fourth values, utilizing the microprocessor; and
adjusting a duty cycle of a signal being applied to the field coil of the rotor based on the first and second torque loading values such that the amount of torque loading of the alternator is maintained within a desired torque loading range.
2. The method of claim 1 , wherein determining the first value indicative of the rotational speed of the rotor at the first time, comprises:
determining a frequency of an AC phase voltage of the stator of the alternator; and
determining the first value indicative of the rotational speed of the rotor based on the frequency of the AC phase voltage of stator.
3. The method of claim 1 , wherein adjusting the duty cycle of the signal being applied to the field coil of the rotor comprises:
increasing the duty cycle of the signal being applied to the field coil of the rotor, when a difference between the first and second torque loading values is greater than a threshold value, and the second torque loading value is less than the first torque loading value, utilizing the microprocessor.
4. The method of claim 1 , wherein adjusting the duty cycle of the signal being applied to the field coil of the rotor comprises:
decreasing the duty cycle of the signal being applied to the field coil of the rotor, when a difference between the first and second torque loading values is greater than a threshold value, and the second torque loading value is greater than the first torque loading value, utilizing the microprocessor.
5. A vehicle alternator, comprising:
a rotor having a field coil;
a stator operably disposed around the rotor, the stator configured to output a voltage in response to rotation of the rotor; and
a voltage regulator having a microprocessor operably coupled to the stator, the microprocessor configured to determine a first value indicative of a rotational speed of the rotor at the first time, the microprocessor further configured to determine a second value indicative of an amount of current being output by the stator of the alternator at substantially the first time, the microprocessor further configured to determine a first torque loading value that is indicative of a relative amount of torque loading associated with the alternator, based on first and second values, the microprocessor further configured to determine a third value indicative of a rotational speed of the rotor at a second time, the second time being after the first time, the microprocessor further configured to determine a fourth value indicative of an amount of current being output by the stator of the alternator at substantially the second time, the microprocessor further configured to determine a second torque loading value that is indicative of the relative amount of torque loading associated with the alternator based on third and fourth values, the microprocessor further configured to adjust a duty cycle of a signal being applied to the field coil of the rotor based on the first and second torque loading values such that an amount of torque loading of the alternator is maintained within a desired torque loading range.
6. The vehicle alternator of claim 5 , wherein the microprocessor is further configured to determine a frequency of an AC phase voltage of the stator of the alternator, the microprocessor being further configured to determine the first value indicative of the rotational speed of the rotor based on the frequency of the AC phase voltage of the stator.
7. The vehicle alternator of claim 5 , wherein the microprocessor is configured to increase the duty cycle of the signal being applied to the field coil of the rotor, when a difference between the first and second torque loading values is greater than a threshold value, and the second torque loading value is less than the first torque loading value.
8. The vehicle alternator of claim 5 , wherein the microprocessor is configured to decrease the duty cycle of the signal being applied to the field coil of the rotor, when a difference between the first and second torque loading values is greater than a threshold value, and the second torque loading value is grater than the first torque loading value.
9. A method for controlling an amount of torque loading of a vehicle alternator on an engine, the alternator having a rotor, a stator, and a voltage regulator, the voltage regulator having a microprocessor, the method comprising:
determining a first value indicative of an amount of current being output by the stator of the alternator at substantially the first time, utilizing the microprocessor in the voltage regulator;
determining a second value indicative of an amount of current being output by the stator at a second time, utilizing the microprocessor, the second time being after the first time; and
adjusting a duty cycle of a signal being applied to the field coil of the rotor based on the first and second values such that the amount of torque loading of the alternator is maintained within a desired torque loading range, utilizing the microprocessor.
10. The method of claim 9 , wherein adjusting the duty cycle of the signal being applied to the field coil of the rotor comprises increasing the duty cycle of the signal being applied to the field coil of the rotor, when a difference between the first and second values is greater than a threshold value, and the second value is less than the first value, utilizing the microprocessor.
11. The method of claim 9 , wherein adjusting the duty cycle of the signal being applied to the field coil of the rotor comprises decreasing the duty cycle of the signal being applied to the field coil of the rotor, when a difference between the first and second values is greater than a threshold value, and the second value is greater than the first value, utilizing the microprocessor.
12. A vehicle alternator, comprising:
a rotor having a field coil;
a stator operably disposed around the rotor, the stator configured to output a voltage in response to rotation of the rotor; and
a voltage regulator having a microprocessor operably coupled to the stator, the microprocessor configured to determine a first value indicative of an amount of current being output by the stator of the alternator at substantially the first time, the microprocessor further configured to determine a second value indicative of an amount of current being output by the stator at a second time, the second time being after the first time, the microprocessor further configured to adjust a duty cycle of a signal being applied to the field coil of the rotor based on the first and second values such that the amount of torque loading of the alternator is maintained within a desired torque loading range.
13. The vehicle alternator of claim 12 , wherein the microprocessor is configured to increase the duty cycle of the signal being applied to the field coil of the rotor, when a difference between the first and second values is grater than a threshold value, and the second value is less than the first value.
14. The vehicle alternator of claim 12 , wherein the microprocessor is configured to decrease the duty cycle of the signal being applied to the field coil of the rotor, when a difference between the first and second values is greater than a threshold value, and the second value is greater than the first value.