Charging generator with self-diagnosis function

• US 5,521,486 A
• Filed: 12/21/1994
• Issued: 05/28/1996
• Est. Priority Date: 12/24/1993
• Status: Expired due to Term

• Current Assignee: Hitachi Automotive Engineering Company Limited (Hitachi, Ltd.), Hitachi, Ltd.
• Original Assignee: Hitachi Automotive Engineering Company Limited (Hitachi, Ltd.), Hitachi, Ltd.
• Inventors: Maeda, Yuji, Takamoto, Nobuo, Marumoto, Katsuji, Hikita, Sakae
• Primary Examiner(s): Stephan, Steven L.
• Assistant Examiner(s): Ponomarenko, Nicholas
• Application Number:
  US08/360,968
• Time in Patent Office: 524 Days
• Field of Search: 322/28, 320/61, 320/64
• US Class Current: 322/99
• CPC Class Codes: H02J 7/0047 with monitoring or indicating devices or circuits
• CPC Class Codes: H02J 7/14 for charging batteries from dynamo-electric generators driven at varying speed, e.g. on vehicle
• CPC Class Codes: H02P 9/00 Arrangements for controlling electric generators for the purpose of obtaining a desired output
• CPC Class Codes: Y02T 10/70 Energy storage systems for electromobility, e.g. batteries

Abstract

A charging generator having a self-diagnosis function includes a self-diagnosis circuit, a storage device and an output device. When an anomaly is detected, the charging generator with a self-diagnosis function stores data concerning at least one anomalous condition of the generator and the contents of the anomaly in the storage device, and outputs the anomalous data concerning the generator or the contents of the anomaly, which are stored in the storage device, by inputting a specific signal from the outside.

Claims

1. A charging generator circuit, comprising a generator having an armature winding and a field winding and adapted to be driven by an engine, and a voltage adjustment unit for adjusting the output voltage of said generator by controlling field currents of said field winding, said generator adapted to provide an output to charge a battery wherein said voltage adjustment unit comprises:

self-diagnosis means, for diagnosing a control circuit of said voltage adjustment unit;

storage means in said self-diagnosis means, for storing data concerning states of said charging generator circuit, including diagnosis results; and

output means for outputting data stored in said storage means, including the stored diagnosis results, in response to receipt of a stored-data-output-requiring signal received from outside said charging generator circuit.

2. A charging generator circuit according to claim 1, wherein said self-diagnosis means includes an input signal terminal, and circuit means for distinguishing a stored-data-output-requiring signal received at said input signal terminal, from an outside control signal from an engine control unit, also received at said input signal terminal, based on at least one of the received signal amplitude and the received signal frequency.

3. A charging generator circuit according to claim 1, wherein said storage means stores at least one of data concerning anomalous states of said charging generator circuit when an anomaly occurs and contents of the anomaly.

4. A charging generator circuit according to claim 1, wherein said output means includes at least one of display means for displaying outputs from said self-diagnosis means, and transmission means, for transmitting the diagnosis results to an output device outside of said charging generator circuit.

5. A charging generator circuit according to claim 2, wherein said voltage adjustment unit further comprises a control circuit for controlling the output voltage of said generator in response to the data concerning the states of said charging generator circuit, the voltage of said battery, the field currents, the rotation speed of said generator and the outside control signal from the engine control unit, and wherein said self-diagnosis means executes self-diagnosis based on the data concerning the states of said charging generator circuit, control signals output from said control circuit and the outside control signal.

6. A charging generator circuit according to claim 1, wherein said self-diagnosis means includes information display means adapted to be installed in a vehicle, for displaying stored data on the states of said charging generator circuit, including the diagnosis results.

7. A charging generator circuit according to claim 1, wherein said output means is adapted to output stored data from said storage means to a device capable of information processing which is connected to said output means.

8. A charging circuit according to claim 1, wherein said storage means is non-volatile so as to have the ability of keeping the stored data even in the case of power source interruption.

9. A charging generator circuit adapted to be driven by an engine of a vehicle for feeding currents to loads, comprising a generator;

a voltage adjustment unit for adjusting the output voltage of said generator by controlling field currents of a field winding of said generator; and

a battery charged by outputs of said generator, wherein said voltage adjustment circuit comprising;

self-diagnosis means, for diagnosing a control circuit of said voltage adjustment unit; and

storage means in said self-diagnosing means, for storing data concerning states of said charging generator circuit, including diagnosis results provided by said self-diagnosis means, wherein said storage means maintains the data stored therein capable of being read out when said voltage adjustment unit is taken out from the vehicle.

10. A charging generator circuit comprising a generator adapted to be driven by an engine of a vehicle, for feeding currents to loads;

and a voltage adjustment unit, for adjusting the output voltage of said generator by controlling field currents of a field winding of said generator, said generator adapted to provide an output to charge a battery, wherein said voltage adjustment unit comprises;

self-diagnosis means, for diagnosing a control circuit of said voltage adjustment unit;

storage means in said self-diagnosis means, for storing data concerning states of said charging generator circuit, including diagnosis results;

an information display device connected to said storage means and adapted to be installed in the vehicle, for displaying the stored data; and

output means connected to said self diagnosis means and adapted to be connected to a utilizing device outside the vehicle, for outputting the stored data to the outside utilizing device.

11. A charging generator with a self-diagnosis function according to claim 9 or 10, wherein said storage means is formed by using nonvolatile memories.

12. A voltage adjustment unit for adjusting the output voltage of a generator which charges a battery in a vehicle by controlling field currents of the generator, said voltage adjustment unit comprising:

self-diagnosis means, for diagnosing a control circuit of said voltage adjustment unit;

storage means in said self-diagnosing means for storing data concerning states of said voltage adjustment unit, the generator, and the battery, including diagnosis results;

output means for outputting data stored in said storage means, including the stored diagnosis results, in response to receipt of a stored-data-output-requiring signal received from outside the voltage adjustment unit; and

a control circuit for controlling the output voltage of the generator in response to the stored state data, the voltage of the battery, the field currents, the rotation speed of the generator, and an outside control signal.