Apparatus for controlling on-vehicle generator

• US 20060006845A1
• Filed: 07/06/2005
• Published: 01/12/2006
• Est. Priority Date: 07/06/2004
• Status: Active Grant

• Current Assignee: DENSO Corporation
• Original Assignee: DENSO Corporation
• Inventors: Aoyama, Toru
• Granted Patent: US 7,285,938 B2
• Time in Patent Office: Days
• US Class Current: 322/22
• CPC Class Codes: H02P 9/10 Control effected upon generator excitation circuit to reduce harmful effects of overloads or transients, e.g. sudden application of load, sudden removal of load, sudden change of load
• CPC Class Codes: H02P 9/305 controlling voltage H02P9/302 takes precedence

Abstract

A generation controller controls an amount of power generated by an on-vehicle generator responsively to a command signal from an external controller. The generation controller comprises detection, determination, and output control units. The detection unit detects a revolution number of the generator. The determination unit determines whether or not the revolution number of the generator is over a reference revolution number. The output control it controls a generator output based on a first target value decided corresponding to a command value indicated by the command signal, when the revolution number of the generator is less than the reference revolution number, and controls the generator output based on a second target value in place of the first target value. The second target value is set internally within the generation controller, when the revolution number of the generator is over or equal to the reference revolution number.

Claims

1. A generation controller for controlling an amount of power generated by an on-vehicle generator in response to a command signal transmitted from an external controller placed outside the generator, the generation controller comprising;

a detection unit detecting a revolution number of the generator;

a determination unit determining whether or not the revolution number of the generator is over a reference revolution number; and

an output control unit controlling an output of the generator based on a first target value decided corresponding to a command value indicated by the command signal, in cases where the revolution number of the generator is less than the reference revolution number, and controlling the output of the generator based on a second target value in place of the first target value, the second target value being set internally within the generation controller, in cases where the revolution number of the generator is over or equal to the reference revolution number.

2. The generation controller according to claim 1, wherein the first target value is a value to allow the amount of power generated by the generator to be less than an amount of power generated by the generator based on the second target value.

3. The generation controller according to claim 1, wherein the reference revolution number is substantially equal to an idling revolution number of an engine to drive the generator.

4. The generation controller according to claim 1, wherein the reference revolution number is set to an amount smaller than an idling revolution number of an engine to drive the generator.

5. The generation controller according to claim 1, wherein the first target value is a value to allow the amount of power generated by the generator to be higher than an amount of power generated by the generator based on the second target value.

6. The generation controller according to claim 5, wherein the reference revolution number is set to an amount higher than an idling revolution number of an engine to drive the generator.

7. The generation controller according to claim 1, wherein the second target value is a value substantially equal to a voltage charging a battery connected to the generator.

8. The generation controller according to claim 2, wherein the second target value is a value substantially equal to a voltage charging a battery connected to the generator.

9. The generation controller according to claim 3, wherein the second target value is a value substantially equal to a voltage charging a battery connected to the generator.

10. The generation controller according to claim 4, wherein the second target value is a value substantially equal to a voltage charging a battery connected to the generator.

11. The generation controller according to claim 5, wherein the second target value is a value substantially equal to a voltage charging a battery connected to the generator.

12. The generation controller according to claim 6, wherein the second target value is a value substantially equal to a voltage charging a battery connected to the generator.

13. A generation controller for controlling an amount of power generated by an on-vehicle generator in response to a command signal from an external controller placed outside the generator, the generation controller comprising:

a detection unit detecting a revolution number of the generator;

a determination unit determining whether or not the revolution number of the generator is within a predetermined range of revolution numbers, and

an output control unit controlling an output of the generator based on a first target value decided corresponding to a command value indicated by the command signal, in cases where the revolution number of the generator is within the predetermined range of revolution numbers and controlling the output of the generator based on a second target value in place of the first target value, the second target value being set internally within the generation controller, in cases where the revolution is number of the generator is outside the predetermined range of revolution numbers.

14. The generation controller according to claim 13, wherein the second target value is a value substantially equal to a voltage charging a battery connected to the generator.

15. The generation controller according to claim 14, wherein the determination unit comprises

a first determination circuit determining a difference between a lower limit of the predetermined range of revolution numbers and the revolution number of the generator using an amplitude of a phase voltage induced across an armature winding of the generator,

wherein the first determination circuit comprises

a detection circuit detecting, as the amplitude, a peak value of the phase voltage, and

a first voltage comparator determining whether or not the peak value is lower than a first reference voltage lower than the voltage charging the battery, and producing a switching signal for commanding the control of the output of the generator carried out based on the second target value, in cases where it is determined that the peak value is lower than the first reference voltage, and for commanding the control of the output of the generator carried out based on the first target value, in cases where it is determined that the peak value is higher than or equal to the first reference voltage.

16. The generation controller according to claim 15, wherein the output control unit comprises regulation means for regulating the output of the generator so that the peak value of the phase voltage is kept at the first reference voltage, when the first target value is set to an amount lower than the voltage charging the battery.

17. The generation controller according to claim 15, wherein the determination unit comprises a second determination circuit determining a difference between an upper limit of the predetermined range of revolution numbers and the revolution number of the generator on the basis of a frequency of the phase voltage,

wherein the second determination circuit comprises

a second voltage comparator making a comparison between the phase voltage and a second reference voltage designated as an amount less than the first reference voltage;

and

a frequency comparator determining, based on compared results at the second voltage comparator, whether or not the frequency of the phase voltage is smaller than a reference frequency, and producing the switching signal for commanding the control of the output of the generator carried out based on the first target value, in cases where it is determined that the frequency of the phase voltage is lower than the reference frequency, and for commanding the control of the output of the generator carried out based on the second target value, in cases where it is determined that the frequency of the phase voltage is higher than or equal to the reference frequency.

18. The generation controller according to claim 16, wherein the determination unit comprises a second determination circuit determining a difference between an upper limit of the predetermined range of revolution numbers and the revolution number of the generator on the basis of a frequency of the phase voltage,

wherein the second determination circuit comprises

a second voltage comparator making a comparison between the phase voltage and a second reference voltage designated as an amount less than the first reference voltage;

and

a frequency comparator determining, based on compared results at the second voltage comparator, whether or not the frequency of the phase voltage is smaller than a reference frequency, and producing the switching signal for commanding the control of the output of the generator carried out based on the first target value, in cases where it is determined that the frequency of the phase voltage is lower than the reference frequency, and for commanding the control of the output of the generator carried out based on the second target value, in cases where it is determined that the frequency of the phase voltage is higher than or equal to the reference frequency.

19. The generation controller according to claim 17, wherein the determination unit comprises

a third voltage comparator comparing the peak value of the phase voltage with a third reference voltage higher than the first reference voltage but lower than the voltage charging the battery, and

means for outputting to the output control unit an internal generation control signal on the basis of compared results at the first and third voltage comparators, the internal generation control signal being set to shut off an exciting current flowing through an exciting winding of the generator, in cases where the peak value is higher than or equal to the third reference voltage, and to allow the exciting current to flow through the exciting winding, in cases where the peak value is higher than or equal to the first reference voltage but lower than the third reference voltage.

20. The generation controller according to claim 19, comprising means for transmitting at least one of the switching signal from the determination unit and the switching signal from the first determination circuit towards the external controller.