JP2010081674A - Method of adjusting generator control device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method of adjusting a generator control device that adjusts a voltage of a battery so as to be accurately controllable. <P>SOLUTION: An indication device 21 detects the voltage of the battery 4 while an AC generator 1 is controlled by the control logic 13 of the generator control device 5, obtains a difference voltage between the voltage of the battery 4 and a control target value according to a power generation control command when voltage control satisfies prescribed stable conditions, then transmits the difference voltage to the control logic 13 via a communication unit 14, and stores it in a memory circuit 22. When the generator control device controls the AC generator 1 according to the control command applied by an engine control ECU, the generator control device 5 corrects the control command according to a data table for correction stored in the memory circuit 22 and the difference voltage which is stored as a result of the adjusting processing. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a method of adjusting a control state of a vehicle generator by a generator control device.

  Vehicles are constantly required to improve fuel efficiency, and for generators (alternators) that charge batteries, the ECU sends control commands to the control device to control the power generation state and control the battery voltage appropriately. It is supposed to be. Conventionally, when the control state of the generator control device is adjusted, the circuit is often trimmed in a state where the IC chip is in a wafer state, and there has been a case in which a deviation occurs in the control when actually mounted on the vehicle. Further, once the circuit is trimmed by hardware, the adjustment state cannot be restored.

For example, in Patent Document 1, in order to adjust the excitation current of an electric machine, in a configuration in which an excitation current detection adjustment signal given from an external terminal is received and the detection level of the excitation current is adjusted, the value of the storage element in the monolithic IC is A technique is disclosed in which the excitation current detection level is adjusted in a state where an excitation current equivalent to that in the actual use state flows by means such as changing.
JP 2003-153596 A

However, when controlling the excitation current of a generator like patent document 1, there exists a problem that it cannot be guaranteed whether the voltage of a battery is controlled appropriately as a result of the generator having generated electric power according to it.
This invention is made | formed in view of the said situation, The objective is to provide the adjustment method of the generator control apparatus which can adjust so that the voltage of a battery can be controlled with high precision.

According to the adjustment method of the generator control device according to claim 1, the voltage of the battery is detected in a state where the vehicle generator is controlled by the control means, and the control of the vehicle generator satisfies a predetermined stability condition. In this case, the difference between the battery voltage and the control target value corresponding to the power generation control command is obtained as an offset value. Then, the obtained offset value is transmitted from the outside to the control means via the communication means and stored.
According to such a method, the generator control device corrects the power generation control command given from the outside based on the offset value stored in advance when the vehicular generator is subsequently controlled, so that the voltage of the battery Can be controlled to a value according to a given power generation control command. Therefore, the generator control device can be easily adjusted.

  According to the adjustment method of the generator control device according to claim 2, since it is determined that the stability condition is satisfied when the rotational speed of the vehicle generator is within a predetermined range, the rotation of the vehicle generator is stabilized. It is possible to determine the stable condition in a state where

  According to the method for adjusting a generator control device according to claim 3, since it is determined that the stability condition is satisfied when the duty of the PWM signal output by the control means is within a predetermined range, the PWM duty is not changed. The stability condition can be reasonably determined.

According to the adjustment method of the generator control apparatus according to the fourth aspect, the control means can control the output of the vehicle generator by controlling the excitation current, and can stabilize the vehicle generator.
According to the method for adjusting the generator control device according to claim 5, the control means controls the vehicle generator so that the excitation current also becomes a predetermined reference value based on the power generation control command. The battery voltage can be controlled to a predetermined reference value while also controlling.

According to the generator control device adjustment method of the sixth aspect, since the communication means performs serial communication, communication when adjustment is performed can be realized with a small number of signal lines.
According to the adjustment method of the generator control device according to claim 7, the control means notifies the outside via the communication means when the battery voltage falls below the lower limit value. It can be recognized from the above notification that an abnormality has occurred in the generator.

(First embodiment)
A first embodiment of the present invention will be described below with reference to FIGS. FIG. 1 is a functional block showing a configuration of a generator control device of an AC generator. One end of the stator windings 2U, 2V, 2W of the AC generator 1 (alternator, vehicle generator) is connected in common (star connection), and the other end of each of the three-phase full-wave rectifiers 3 composed of six diodes. Each is connected to a phase AC input terminal. The DC output terminal of the three-phase full-wave rectifier 3 is connected to the positive terminal of the in-vehicle battery 4 and the ground.

  The power supply terminal B of the generator control device 5 configured as a semiconductor integrated circuit is connected to the positive terminal of the battery 4 and to the cathode of the freewheeling diode 6. The anode of the freewheeling diode 6 is connected to the drain of the N-channel power MOSFET 7, and the source of the FET 7 is connected to the ground via the ground terminal G of the generator control device 5. The drain of the FET 7 is connected to the rotor winding 8 of the AC generator 1 via the output terminal F of the generator control device 5.

  The power supply terminal B is connected to the ground through a series circuit of the resistance elements 9 and 10, and the common connection point of the resistance elements 9 and 10 is an A / D converter via a voltage buffer 11 composed of an operational amplifier. It is connected to 12 input terminals. An output terminal of the A / D converter 12 is connected to an input terminal of a control logic 13 (control means) composed of a microcomputer. During normal operation, the control logic 13 performs serial communication via an external engine control ECU (Electronic Control Unit), a communication unit 14 (communication means), and a communication terminal C. The communication unit 14 includes a communication driver 15, a communication controller 16, a reception signal storage unit 17, a transmission signal storage unit 18, and the like.

  When the communication controller 16 receives the signal (serial data) transmitted from the engine control ECU via the communication driver 15, the signal is serial / parallel converted and stored in the received signal storage unit 17. When a signal (parallel data) transmitted by the control logic 13 is written in the transmission signal storage unit 18, the transmission data is parallel / serial converted by the communication controller 16 and transmitted to the engine control ECU via the communication controller 16. . Then, the control logic 13 outputs a PWM (Pulse Width Modulation) signal to the gate of the FET 7 through the driver 19 in accordance with the power generation control command transmitted from the engine control ECU, and performs PWM control on the AC generator 1.

  The alternator 1 is provided with a pulse encoder (not shown), and a pulse signal output with the rotation of the alternator 1 is generated via the input terminal P of the generator control device 5. Given to. The power generation rotation detection unit 20 detects the number of rotations of the AC generator 1 by measuring the interval between the input pulse signals, and outputs the detection result to the control logic 13.

  In FIG. 1, instead of the engine control ECU described above, an instruction device 21 (trimming device) for trimming (adjusting) the generator control device 5 before shipping as a product is connected. The instruction device 21 can directly detect the voltage of the battery 4 and transmits an adjustment value (offset value) obtained as a result of trimming to the generator control device 5. When the control logic 13 receives the adjustment value, it writes it in a storage circuit 22 (storage means) composed of a nonvolatile memory such as an EEPROM. And when controlling the alternator 1 in normal operation, the said adjustment value is read from the memory | storage circuit 22, and the electric power generation control command transmitted from engine control ECU is adjusted.

  Next, the operation of the present embodiment will be described with reference to FIGS. FIG. 2 shows the correction during actual control according to the difference voltage (offset value) that is stored in advance in the storage circuit 22 of the generator control device 5 and that is the difference between the voltage corresponding to the control command and the voltage of the battery 4. It is the correction table which matched the power voltage. “A” and “N” in the correction table indicate different individuals of the generator control device 5, and the characteristics of those that may be used are measured in advance.

  FIG. 3 is a flowchart showing a processing procedure when the generator control device 5 is trimmed by the instruction device 21. When power is turned on to the generator control device 5 via a key switch (not shown), the instruction device 21 transmits a duty for controlling power generation by the AC generator 1 to the generator control device 5 as a control command ( Step S1). Then, the control logic 13 receives the control command, gives a PWM signal to the FET 7 with a duty according to the command, and controls the voltage by passing an exciting current through the rotor winding 8 (step S2).

  In subsequent step S <b> 2 a, when the rotation detection unit 20 detects the rotation number of the AC generator 1, the generator control device 5 transmits the rotation number to the instruction device 21 side. The indicating device 21 determines that the voltage control satisfies the stable condition when the rotational speed of the AC generator 1 and the load (load current) of the indicating device 21 reach predetermined values and the fluctuations thereof are reduced to some extent ( YES) The next step S3 is executed. Further, the voltage control in step S2 is continued until the stability condition is satisfied (NO). However, if it is not stabilized within the predetermined time, it is determined as abnormal (step S2b: YES), and the process is terminated without correction (step S8).

In step S3, the indicating device 21 detects the voltage of the battery 4 at this time, and whether or not the voltage corresponds to the power generation control command transmitted in step S1 (for example, whether or not the difference between the two is within a predetermined range). Whether or not the control voltage of the generator control device 5 needs to be corrected is determined. If the voltage of the battery 4 is a voltage equivalent to the control command, no correction is necessary (NO), and the adjustment ends at that time (step S7).
On the other hand, if the voltage of the battery 4 is not a voltage equivalent to the control command, correction is necessary (step S3: YES). In this case, the difference between the voltage of the battery 4 and the control command equivalent voltage is corrected by the indicating device 21. It is determined whether or not it is within the possible range (step S4). If it is outside the correctable range (NO), it is treated as abnormal, and the process is terminated without correction (step S8).

  In step S4, if it is within a range that can be corrected by the indicating device 21 (YES), a command for setting the storage circuit 22 to the writing mode is transmitted to the generator control device 5 (step S5), and then both voltages A voltage (difference voltage, offset value) corresponding to the difference is transmitted to the generator control device 5 (step S6). At this time, the instruction device 21 also transmits a code (ID) that specifies whether the generator control device 5 is made of A or N. Then, the control logic 13 sets the storage circuit 22 in a writable state, and writes the transmitted differential voltage in the storage circuit 22 together with the ID. This completes the adjustment process.

  When the generator control device 5 actually controls the AC generator 1, the generator control device 5 reads the ID and the differential voltage stored in the storage circuit 22 and corresponds to a power generation control command given from the engine control ECU. Correct the control voltage. For example, as shown in FIG. 2, for example, if the ID is A and the differential voltage is 30 mV, an actual control command is obtained by subtracting 50 mV from the command equivalent voltage.

  FIG. 4 is a map showing feedback control performed by the control logic 13 during actual control, and the control voltage on the horizontal axis corresponds to a power generation control command given from the engine control ECU. The difference voltage on the vertical axis is a difference voltage generated as a result of control performed by the control logic 13 in accordance with a control command, and is obtained from the voltage of the battery 4 obtained by the A / D converter 12. If the differential voltage is +50 mV, feedback control is performed so that the internal control voltage instructed by the control logic 13 is -50 mV.

  As described above, according to the present embodiment, the indication device 21 detects the voltage of the battery 4 in a state where the AC generator 1 is controlled by the control logic 13 of the generator control device 5, and the voltage control is performed in a predetermined manner. When the stability condition is satisfied, when the difference between the voltage of the battery 4 and the control target value according to the power generation control command is obtained as a difference voltage, the difference voltage is transmitted to the control logic 13 via the communication unit 14 and stored. The data is stored in the circuit 22. The generator control device 5 stores the correction data table stored in the storage circuit 22 and the result of the adjustment process described above when the AC generator 1 is controlled in accordance with a control command given from the engine control ECU. The control command is corrected according to the difference voltage.

Therefore, the generator control device 5 corrects the power generation control command given from the engine control ECU by the differential voltage stored in the storage circuit 22 when the AC generator 1 is controlled thereafter, so that the battery 4 Since the voltage can be controlled to a value corresponding to the given power generation control command, the generator control device 5 can be easily adjusted.
The indicating device 21 determines that the stability condition is satisfied when the rotational speed of the alternator 1 is within a predetermined range. Therefore, the stability condition is appropriately determined in a state where the rotation of the alternating current generator 1 is stable. it can. Further, the control logic 13 can control the output of the AC generator 1 by controlling the excitation current, and can stabilize the AC generator 1. Furthermore, since the communication unit 14 performs serial communication, communication for adjustment can be realized with a small number of signal lines.

(Second embodiment)
FIGS. 5 to 7 show a second embodiment of the present invention. The same parts as those of the first embodiment are denoted by the same reference numerals and the description thereof will be omitted. Hereinafter, different parts will be described. In the second embodiment, an output terminal D is provided in the generator control device 5A, and the PWM signal output from the control logic 13 is configured to be observable from the outside. The instruction device 23 detects the duty by observing the PWM signal via the output terminal D instead of the voltage of the battery 4 and outputs the control command to the generator control device 5A in step S1. The difference from the duty (difference duty) is obtained. On the other hand, as shown in FIG. 6, a correction data table corresponding to the differential duty is stored in the storage circuit 22A of the generator control device 5A.

  Next, the operation of the second embodiment will be described with reference to FIGS. The basic processing procedure is the same as that of the flowchart shown in FIG. 3, but the instruction device 23 obtains and evaluates the above-described difference duty (offset value) instead of the difference voltage in steps S3 and S4. Further, the stability condition of the power generation control in step S2a is determined as “condition satisfied” when the fluctuation of the PWM signal duty observed through the output terminal D converges within a predetermined range. In step S6, the differential duty is transmitted to the generator control device 5A instead of the differential voltage, and is stored in the storage circuit 22A.

  When the generator control device 5A controls the AC generator 1 according to a control command from the engine control ECU, the generator control device 5A reads the ID and the differential duty stored in the storage circuit 22A, and controls the control voltage corresponding to the power generation control command. Correct. As shown in FIG. 6, for example, if the differential duty is 30%, the actual control command is obtained by adding 80 mV to the command equivalent voltage.

FIG. 7 is a diagram corresponding to FIG. 4, but the vertical axis indicates a difference generated in the PWM signal duty output by the control logic 13 as a result of the control logic 13 performing control according to the control command. When the difference duty on the vertical axis is + 50%, feedback control is performed by correcting the PWM duty so that the internal control voltage by the control logic 13 is +25 mV. FIG. 7 is the same even if the horizontal axis is replaced with PWM duty (0% to 100%) as a control command output by the engine control ECU.
As described above, according to the second embodiment, the indicating device 23 determines that the stability condition is satisfied when the duty of the PWM signal output by the control logic 13 is within a predetermined range, and therefore the PWM duty varies. When it disappears, the stable condition can be judged appropriately.

(Third embodiment)
8 and 9 show a third embodiment of the present invention, and only the parts different from the first embodiment will be described. The generator control device 24 of the third embodiment includes an FET 25 with a current detection terminal instead of the FET 7, and the current detection terminal has a drain current of the FET 25, that is, an excitation current of the AC generator 1. On the other hand, for example, a current of about 1/1000 is shunted.

  The current detection terminal of the FET 25 is connected to the ground via the detection resistance element 26 and is also connected to the input terminal of the A / D conversion circuit 27. The A / D conversion circuit 27 A / D converts the terminal voltage of the resistance element 26 and outputs it to the control logic 28 (control means) that replaces the control logic 13. The indicating device 29 outputs the excitation current of the AC generator 1 as a power generation control command, and the control logic 28 determines the excitation current of the AC generator 1 given via the A / D conversion circuit 27. Also, feedback control is performed so as to match the control command.

Next, the operation of the third embodiment will be described with reference to FIG. FIG. 9 is a correction map when the control logic 28 performs the feedback control by observing the excitation current. For example, when the control command equivalent voltage on the horizontal axis is 13 V and the control command equivalent excitation current on the vertical axis is 10 A, FIG. Then, the same correction as in the first embodiment is performed on the internal control voltage corresponding to the PWM duty output from the control logic 28, and further, 0.1V (100 mV) is further corrected. When the control command equivalent voltage is 16 V and the control command equivalent excitation current is 20 A, correction is made so that +0.2 V is added to the internal control voltage.
As described above, according to the third embodiment, the control logic 28 controls the alternator 1 so that the excitation current of the alternator 1 also becomes a predetermined reference value based on the power generation control command. The voltage of the battery 4 can be controlled to a predetermined reference value while controlling the exciting current.

The present invention is not limited to the embodiments described above and shown in the drawings, and the following modifications or expansions are possible.
During the trimming process, when the voltage of the battery 4 falls below the lower limit value, the control logic 13 may notify the outside via the communication unit 14 to that effect. If comprised in this way, it can recognize by said notification that abnormality generate | occur | produced in the battery 4 or the alternating current generator 1 during adjustment work. Further, the same notification may be given during normal control by the engine control ECU.

The correction table may correspond to one type or may correspond to three or more types. In addition, it is not always necessary to use the correction table, and if it is sufficient to adjust only the value corresponding to the difference voltage, the correction table may be corrected directly.
In the third embodiment, instead of the FET 25 with a current detection terminal, a current detection FET may be connected in parallel to the FET 7 to detect the current flowing through the FET.
The communication means is not necessarily limited to serial communication.

1 is a functional block diagram showing the configuration of a generator control device according to a first embodiment of the present invention. The figure which shows the correction table according to the difference voltage Flow chart showing the processing procedure when trimming the generator control device Map showing feedback control performed by control logic during actual control FIG. 1 equivalent view showing a second embodiment of the present invention. The figure which shows the correction table according to difference duty 4 equivalent figure FIG. 1 equivalent view showing a third embodiment of the present invention. 4 equivalent figure

Explanation of symbols

  In the drawings, 1 is an AC generator (vehicle generator), 4 is an on-board battery, 5 and 5A are generator control devices, 13 is a control logic (control means), 14 is a communication unit (communication means), and 21 and 23. Indicates an indicating device, 24 indicates a generator control device, 28 indicates a control logic (control means), and 29 indicates an indicating device.

Claims (7)

A vehicle generator that is mounted on a vehicle and controls a vehicle generator that charges the battery with the generated power. A communication unit that receives a power generation control command given from the outside, and a voltage of the battery based on the power generation control command In the method of adjusting the control state of the vehicular generator by a generator control device comprising control means for controlling the vehicular generator so as to be a reference value of
In a state where the vehicle generator is controlled by the control means, the voltage of the battery is detected,
When the control of the vehicle generator satisfies a predetermined stability condition, a difference between the battery voltage and a control target value according to the power generation control command is obtained as an offset value,
A method for adjusting a generator control device, wherein the offset value is transmitted to and stored in the control means via the communication means.   The method of adjusting a generator control device according to claim 1, wherein the number of rotations of the vehicle generator is detected and it is determined that the stability condition is satisfied when the number of rotations is within a predetermined range. When the control means controls the vehicle generator PWM (Pulse Width Modulation),
The adjustment of the generator control device according to claim 1, wherein the duty of the PWM signal output by the control means is detected, and the stability condition is determined when the duty is within a predetermined range. Method.   4. The method of adjusting a generator control device according to claim 1, wherein the control means controls an output of the vehicle generator by controlling an excitation current. When a control command for controlling the excitation current is also given as the power generation control command,
5. The adjustment of the generator control device according to claim 4, wherein the control unit controls the vehicle generator so that the excitation current also becomes a predetermined reference value based on the power generation control command. Method.   The generator control device adjustment method according to claim 1, wherein the communication unit performs serial communication.   The adjustment of the generator control device according to any one of claims 1 to 6, wherein, when the battery voltage falls below a lower limit value, the control means notifies the outside via the communication means. Method.

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