JP2007267541A - Inspection method for motor control circuit by feedback control, inspection device for motor control circuit, and inspection control program - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To quantitatively and highly precisely execute the quality discrimination of a motor control circuit which performs feed back control based on analog information fed back from a motor to be controlled. <P>SOLUTION: The data of the control signal judging profile 12 of a normal recording control part 100 are compared with the data of the control signal profile 13 of the recording control part 100 to be inspected when the feed back control is executed by the feed back signal (input signal profile 11) which is the same feed back signal when the control signal judging profile 12 is obtained. Whether the drive voltage waveforms of a PF motor 58 and a CR motor 63 relative to the feed back control are judged normal or not, based on the result whether both data are matched or not, thereby judging whether the recording control part 100 to be inspected is normal or not. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an inspection method, an inspection apparatus, and an inspection control program for a motor control circuit by feedback control.

  As an example of the analog control circuit, a motor control circuit such as a DC motor by feedback control is known. As a conventional general inspection method of a motor control circuit by this feedback control, for example, a motor driver (a constant current flows through the dummy resistor in a state where the dummy resistor is connected to the circuit to be inspected instead of the motor) There is a known method for determining whether the motor control circuit is good or not based on whether or not a voltage having an expected value is applied to both ends of the dummy resistor from the motor driver. In addition, for example, a method is known in which the quality of the motor control circuit is determined based on whether or not the apparatus actually operates normally in a state where the motor control circuit to be inspected is incorporated in the actual apparatus.

  In addition, as a general digital logic circuit board inspection method, a method for determining whether or not the output data when a certain test pattern data is input logically matches an expected value is known (for example, , See Patent Document 1).

JP 2005-106626 A

  However, in the above method of measuring the voltage across the dummy resistor by controlling the motor driver so that a constant current flows through the dummy resistor in a state where the dummy resistor is connected instead of the motor, the motor driver in the motor control circuit is good or bad. There is a problem that it is not possible to check the quality of the important feedback control logic in the previous stage of motor dry.

  In addition, the above-described method for judging whether the motor control circuit actually operates normally or not in a state where the motor control circuit to be inspected is incorporated in the actual device is a simple operation check test of the device itself. The quality of the feedback control logic in the motor control circuit cannot be quantitatively determined.

  The above-mentioned Patent Document 1 discloses an efficient inspection method for determining whether a digital circuit is good or bad by performing input / output logic check of a large-scale digital logic circuit that executes image processing of particularly large-capacity digital data such as image data. As long as it is disclosed, there is no disclosure of a technique related to a method for inspecting a motor control circuit (analog control circuit) that executes feedback control of a DC motor or the like.

  The present invention has been made in view of such a situation, and the problem is that quantitative and high quality determination of a motor control circuit that performs feedback control based on analog information fed back from a motor to be controlled is quantitatively and highly performed. It is to be able to execute with accuracy.

  To achieve the above object, according to a first aspect of the present invention, a normal motor control circuit executes predetermined motor control to drive a motor, and the motor drive voltage or current waveform and the feedback signal have the same sampling frequency. Normal circuit motor drive waveform data and normal circuit feedback signal data converted into digital data in step 1 are acquired in advance and stored, and reproduced from the normal circuit feedback signal data for the motor control circuit to be inspected The predetermined motor control is executed while feeding back a feedback signal at the time of predetermined motor control to a normal motor control circuit, and the motor drive voltage or current waveform at that time is the same as the sampling frequency at the time of obtaining the normal circuit motor drive waveform data Digital data with a sampling frequency of The inspection target circuit data acquisition step for acquiring and storing the replaced inspection target circuit motor drive waveform data is compared with the normal circuit motor drive waveform data and the inspection target circuit motor drive waveform data. This is a method for inspecting a motor control circuit by feedback control that has a data comparison step in which the target motor control circuit is determined to be normal, and if the target motor control circuit does not match, it is determined that the target motor control circuit is not normal.

  First, a predetermined motor control is executed by a normal motor control circuit to drive the motor, and the motor driving voltage or current waveform at that time and the feedback signal are converted into digital data at the same sampling frequency. Sampling here means collecting an analog amount of an analog signal at regular intervals, and the sampling frequency is a period of collecting this analog amount. The motor drive voltage or current waveform and the feedback signal can be converted into digital data by converting the analog quantity collected at regular intervals into digital quantity data of a predetermined number of bits. At this time, the normal circuit motor drive waveform data and the normal circuit feedback signal data are synchronized in time by setting the sampling frequency of the motor drive voltage or current waveform and the sampling frequency of the feedback signal to the same sampling frequency. Can do. In this way, normal circuit motor drive waveform data and normal circuit feedback signal data when a predetermined motor control is executed by a normal motor control circuit to drive the motor are acquired and stored in advance. The normal circuit motor drive waveform data and normal circuit feedback signal data need only be acquired and stored once, and can be used repeatedly when inspecting the same motor control circuit.

  The inspection of the motor control circuit to be inspected is performed by reproducing a feedback signal when a predetermined motor control is performed on a normal motor control circuit from the normal circuit feedback signal data, and using the reproduced feedback signal as a motor to be inspected. The same motor control is executed by the motor control circuit to be inspected while feeding back to the control circuit. Then, the motor driving voltage or current waveform at that time is converted into digital data, and is acquired and stored as inspection target circuit motor driving waveform data of the inspection target motor control circuit. The sampling frequency at this time is the same as the sampling frequency when the normal circuit motor drive waveform data is acquired. Thereby, the normal circuit motor drive waveform data and the inspection target circuit motor drive waveform data can be temporally synchronized.

  The quality of the inspection target motor control circuit is determined by comparing the normal circuit motor drive waveform data acquired and stored in advance with the inspection target motor drive waveform data of the inspection target motor control circuit. The inspection target circuit motor drive waveform data is data of the motor drive voltage or current waveform when the feedback control by the same feedback signal as that at the time of obtaining the normal circuit motor drive waveform data is executed. Further, since the normal circuit motor drive waveform data and the inspection target circuit motor drive waveform data are converted to digital data at the same sampling frequency, they are synchronized in time. Therefore, by comparing the motor driving voltage or current waveform data in the normal motor control circuit with the motor driving voltage or current waveform data in the motor control circuit to be inspected, if both the compared data match, the inspection target If the compared data do not match, the motor control circuit to be inspected can be determined to be not normal.

  Thus, by comparing the motor drive voltage or current waveform data of the normal circuit with the motor drive voltage or current waveform data of the circuit to be inspected when the same feedback control by the same footback signal is executed, the motor for the feedback control is compared. Whether or not the drive voltage or current waveform is normal can be determined quantitatively and with high accuracy. Therefore, according to the method for inspecting a motor control circuit by feedback control according to the first aspect of the present invention, the pass / fail judgment of the motor control circuit that executes feedback control based on analog information fed back from the motor to be controlled is performed. The effect of being able to execute quantitatively and with high accuracy is obtained.

A second aspect of the present invention is a method for inspecting a motor control circuit by feedback control, characterized in that, in the first aspect described above, the feedback signal is a rotation speed signal of a motor.
According to the method for inspecting a motor control circuit by feedback control described in the second aspect of the present invention, the motor current and the motor current are adjusted so that the actual rotational speed of the motor becomes the target rotational speed while feeding back the actual rotational speed of the motor. In the quality determination inspection of the motor control circuit that adjusts the pulse control duty and the like, it is possible to obtain the operational effects of the invention described in the first aspect.

  According to a third aspect of the present invention, in the first aspect or the second aspect described above, the inspection target circuit data acquisition step includes connecting a dummy resistor to the inspection target motor control circuit and driving the inspection target circuit motor. A method for inspecting a motor control circuit by feedback control, characterized by acquiring waveform data.

  In the inspection target circuit data acquisition step, it is possible to acquire the inspection target circuit motor drive waveform data in a state where the real motor is connected to the motor control circuit to be inspected, but the real motor is used instead of the real motor. A dummy resistor having the same resistance value may be connected. In particular, in the case of a DC motor, since there is a brush life, spike noise is likely to occur in the motor drive voltage or current waveform if it is repeatedly used. For this reason, there is a risk that the quality determination accuracy by comparing the motor driving voltage or current waveform data of the normal circuit with the motor driving voltage or current waveform data of the circuit to be inspected may be reduced by the spike noise. Therefore, in the inspection target circuit data acquisition step, a dummy resistor is connected instead of a real motor to acquire motor drive voltage or current waveform data of the inspection target circuit, thereby reducing the accuracy of pass / fail judgment due to the occurrence of spike noise. Can be prevented.

According to a fourth aspect of the present invention, there is provided an analog signal input / output means capable of inputting a motor driving voltage or current waveform of a motor control circuit and a feedback signal, and a motor driving voltage or current waveform of the motor control circuit and a feedback signal. A / D conversion means capable of converting digital data at a predetermined sampling frequency, storage means capable of storing digital data of the motor drive voltage or current waveform and the feedback signal, analog input / output means, A / D An inspection device for a motor control circuit by feedback control comprising a D conversion means and an inspection control device for controlling the storage means, wherein the inspection control device executes a predetermined motor control by a normal motor control circuit. Same driving voltage or current waveform and feedback signal when the motor is driven Normal circuit motor drive waveform data and normal circuit feedback signal data converted to digital data at a frequency are acquired in advance and stored, and the normal circuit feedback signal data is reproduced for the motor control circuit to be inspected. The predetermined motor control is executed while feeding back a feedback signal at the time of the predetermined motor control to the normal motor control circuit, and the motor driving voltage or current waveform at that time is the sampling frequency at the time of acquiring the normal circuit motor driving waveform data. A test target circuit data acquisition function for acquiring and storing test target circuit motor drive waveform data converted into digital data at the same sampling frequency, and comparing the normal circuit motor drive waveform data with the test target circuit motor drive waveform data And match Inspection of a motor control circuit characterized by having a data comparison function that determines that the motor control circuit to be inspected is normal, and if not matched, determines that the motor control circuit to be inspected is not normal Device.
According to the inspection apparatus for the motor control circuit described in the fourth aspect of the present invention, the effect of the invention described in the first aspect described above can be obtained in the inspection apparatus for the motor control circuit by feedback control.

  According to a fifth aspect of the present invention, in the fourth aspect described above, a feedback signal when a predetermined motor control is executed by the motor control circuit and the motor is driven is supplied to the motor control circuit and the analog signal input / output means. A feedback signal reproduced from the normal circuit feedback signal data is controlled by the analog signal input / output means from the analog signal input / output means, instead of the feedback signal to the motor control circuit for the motor control circuit for the motor control circuit. An inspection apparatus for a motor control circuit, comprising a switching circuit having a configuration capable of switching a connection state output to a circuit.

  By providing a switching circuit with such a configuration, when a normal motor control circuit executes a predetermined motor control to drive the motor to acquire and store normal circuit motor drive waveform data and normal circuit feedback signal data Inspection by executing predetermined motor control while feeding back the feedback signal reproduced from the normal circuit feedback signal data acquired in advance for the motor control circuit to be inspected and the normal circuit feedback signal data for the motor control circuit to be inspected It is possible to easily and reliably switch the connection state between the inspection target motor control circuit and the inspection apparatus when the target circuit motor drive waveform data is acquired and stored. Therefore, it is possible to improve the working efficiency at the time of inspection of the motor control circuit, and to obtain the operational effect that the possibility of erroneous connection between the motor control circuit and the inspection device at the time of inspection can be reduced.

According to a sixth aspect of the present invention, there is provided an analog signal input / output means capable of inputting and outputting a feedback signal and a motor driving voltage or current waveform of a motor control circuit, and a motor driving voltage or current waveform and a feedback signal of the motor control circuit. Of a motor control circuit based on feedback control, comprising: A / D conversion means capable of converting the digital signal at a predetermined sampling frequency; and storage means capable of storing the motor drive voltage or current waveform and the digital data of the feedback signal. In the inspection apparatus, an inspection control program for causing a computer to control the analog input / output means, the A / D conversion means, and the storage means, and executes a predetermined motor control by a normal motor control circuit. Motor drive voltage or current waveform and feedback when driving the motor Normal circuit motor drive waveform data and normal circuit feedback signal data obtained by converting the signal into digital data at the same sampling frequency, and a normal circuit data acquisition procedure for storing in advance and storing the normal circuit feedback to the motor control circuit to be inspected The predetermined motor control is executed while feeding back the feedback signal at the time of the predetermined motor control to the normal motor control circuit reproduced from the signal data, and the motor driving voltage or current waveform at that time is obtained when the normal circuit motor driving waveform data is acquired. Inspection target circuit data acquisition procedure for acquiring and storing test target circuit motor drive waveform data converted into digital data at the same sampling frequency as the sampling frequency of the normal circuit motor drive waveform data and the test target circuit motor drive waveform Data and In contrast, it has a data comparison procedure that determines that the motor control circuit to be inspected is normal if they match, and determines that the motor control circuit to be inspected is not normal if they do not match. This is an inspection control program.
According to the inspection control program of the sixth aspect of the present invention, the inspection device for the motor control circuit by an arbitrary feedback control provided with a computer capable of executing the inspection control program is described in the first aspect. The same effects as those of the present invention can be provided.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
First, a schematic configuration of an ink jet recording apparatus on which a motor control circuit to be inspected by a “motor control circuit inspection apparatus” according to the present invention is mounted will be described.

FIG. 1 is a plan view of an essential part of an ink jet recording apparatus, and FIG. 2 is a side view thereof. FIG. 3 is a schematic block diagram of the ink jet recording apparatus.
In the ink jet recording apparatus 50 that performs recording by forming dots on the recording surface of the recording paper P, the recording paper P can be used as a means that constitutes “recording execution means” that can execute recording on the recording paper P. A carriage 61 that is supported by the carriage guide shaft 51 so as to be movable in the main scanning direction X is provided. The carriage 61 detects a recording head 62 having an ink ejection nozzle (not shown) for performing recording by ejecting ink onto the recording surface of the recording paper P and an end of the recording paper P in the main scanning direction X. A PW sensor 34 is mounted. The carriage 61 reciprocates in the main scanning direction X when the rotational driving force of the CR motor 63 (FIG. 3) is transmitted by a belt transmission mechanism (not shown) using an endless belt. By reciprocating the carriage 61 in the main scanning direction X, the recording head 62 can be scanned in the main scanning direction X with respect to the recording paper P. At a position facing the head surface of the recording head 62, there is provided a platen 52 that regulates the distance between the recording surface of the recording paper P and the head surface of the recording head 62 to a predetermined distance while slidingly supporting the recording paper P. Yes.

  A known capping device 59 is provided outside the one end side of the reciprocating region of the carriage 61 in the main scanning direction X. In a standby state in which recording is not performed, the carriage 61 moves over the capping device 59 and stops, and the cap CP disposed on the capping device 59 that operates using the PF motor 58 (FIG. 3) as a driving force source. The head surface of the recording head 62 is sealed. The stop position of the carriage 61 is defined as a home position HP.

  The ink jet recording apparatus 50 is provided with a transport driving roller 53 and a transport driven roller 54 that transport the recording paper P in the sub-scanning direction Y. The transport driving roller 53 rotates when the rotational driving force of the PF motor 58 (FIG. 3) is transmitted to the gears. A plurality of conveyance driven rollers 54 are provided, and are urged against the conveyance drive roller 53 in a state where the conveyance driven rollers 54 are pivotally supported so as to be driven to rotate. The recording paper P pressed against the outer peripheral surface of the transport driving roller 53 on which the high frictional resistance coating is applied by the pressing urging force of the transport driven roller 54 comes into close contact with the outer peripheral surface of the transport driving roller 53 by the frictional resistance. By rotating the transport driving roller 53 in the transport direction in this state, the recording paper P is transported in the sub-scanning direction Y while the transport driven roller 54 is driven to rotate, whereby the recording head 62 is moved relative to the recording paper P. Scanning in the sub-scanning direction Y.

  In the vicinity of the paper feed tray 57, an ASF (auto sheet feeder) for automatically feeding the uppermost recording paper P of the recording paper P stacked on the paper feed tray 57 is provided. The ASF is a known automatic paper feed mechanism having a paper feed roller 57b provided on the paper feed tray 57 and a separation pad (not shown). The paper feed roller 57 b is disposed on one side of the paper feed tray 57. The recording paper guide 57a is provided on the paper feed tray 57 so as to be slidable in the width direction in accordance with the width of the recording paper P. Then, the recording paper P placed on the paper feed tray 57 is fed by the rotational driving force of the paper feed roller 57b that rotates by transmitting the rotational driving force of the PF motor 58 (FIG. 3). At that time, only the uppermost recording sheet P is accurately separated and automatically fed one by one without the plurality of recording sheets P being fed at a time due to the frictional resistance of the separating pad. ing. A known paper detector 33 for detecting the leading edge and the trailing edge of the conveyed recording paper P is disposed between the paper feed roller 57 b and the transport driving roller 53.

On the other hand, a discharge driving roller 55 and a discharge driven roller 56 are provided as means for discharging the recording paper P after execution of recording. The paper discharge driving roller 55 rotates when the rotational driving force of the PF motor 58 (FIG. 3) is transmitted to the gears, and the recording paper P after recording is discharged in the sub-scanning direction Y by the rotation of the paper discharge driving roller 55. Is done. The paper discharge driven roller 56 has a plurality of teeth around it, and is a toothed roller sharply sharpened so that the tip of each tooth makes point contact with the recording surface of the recording paper P. The plurality of paper discharge driven rollers 56 are individually urged by the paper discharge driving roller 55, and come into contact with the recording paper P when the recording paper P is discharged by the rotation of the paper discharge driving roller 55. The paper rotates as the paper is discharged.
A PF motor 58 (FIG. 3) that rotationally drives the paper feed roller 57b, the conveyance drive roller 53, and the paper discharge drive roller 55 and a CR motor 63 (FIG. 3) that drives the carriage 61 in the main scanning direction X are used for recording control. Drive control is performed by the unit 100. Similarly, the recording head 62 is driven and controlled by the recording control unit 100 to eject ink onto the surface of the recording paper P. The recording control unit 100 forms dots by ejecting ink from the recording head 62 to the recording paper P while reciprocating the carriage 61 in the main scanning direction X, and the predetermined conveyance of the recording paper P in the sub-scanning direction Y. The recording control on the recording paper P is executed while alternately repeating the operation of transporting by the amount.

The recording control unit 100 will be described with reference to FIGS.
The recording control unit 100 includes a ROM 101, a RAM 102, an ASIC (Application Specific Integrated Circuit) 103, an MPU 104, a nonvolatile memory 105, a PF motor driver 106, a CR motor driver 107, and a head driver 108. The MPU 104 receives an output signal of the power switch 35 for turning on / off the power of the rotary encoder 31, linear encoder 32, paper detector 33, PW sensor 34, and ink jet recording apparatus 50 via the ASIC 103. . A ROM 101, a RAM 102, an ASIC 103, an MPU 104, and a nonvolatile memory 105 are connected to the system bus of the recording control unit 100.

  The MPU 104 performs arithmetic processing for executing recording control of the ink jet recording apparatus 50 and other necessary arithmetic processing. The ROM 101 stores a recording control program (firmware) necessary for controlling the ink jet recording apparatus 50 by the MPU 104, and various data necessary for processing the recording control program is stored in the nonvolatile memory 105. . The RAM 102 is used as a work area for the MPU 104 and a storage area for recording data. The ASIC 103 realizes a USB interface with a digital camera 301 or the like connected via a USB connector (not shown) provided in the main body of the ink jet recording apparatus 50, and inputs a digital image file from the digital camera 301 or the like. It has a USBIF 111 that realizes the function to perform.

  The known rotary encoder 31 is arranged so as to output a pulse signal having a period linked to the rotation period of the PF motor 58 so as to detect the rotation amount of the transport driving roller 53. The rotary encoder 31 includes a rotary scale 311 that rotates in conjunction with the rotation of the conveyance drive roller 53, and a rotary scale sensor 312 that detects slits formed at equal intervals along the outer periphery of the rotary scale 311. (Fig. 2). An output signal of the rotary scale sensor 312 that changes with the rotation of the transport driving roller 53 is output to the MPU 104 via the ASIC 103. Therefore, the MPU 104 can specify the rotation speed and rotation direction of the PF motor 58 from the cycle and phase of the pulse signal output from the rotary encoder 31.

  The known linear encoder 32 is arranged so as to output a pulse signal having a cycle linked to the rotation cycle of the CR motor 63 in order to detect the movement amount of the carriage 61. The linear encoder 32 includes a linear scale 321 disposed substantially parallel to the main scanning direction X in the vicinity of the carriage 61, and a linear scale sensor mounted on the carriage 61 that detects slits formed in the linear scale 321 at equal intervals. 322 (FIG. 2). An output signal of the linear scale sensor 322 in which the pulse period changes with the moving speed with the number of pulses corresponding to the moving amount of the carriage 61 in the main scanning direction X is output to the MPU 104 via the ASIC 103. Therefore, the MPU 104 can specify the rotational speed and direction of the CR motor 63 from the cycle and phase of the pulse signal output from the linear encoder 32.

  The ASIC 103 constituting the recording control unit 100 as a “motor control circuit” to be inspected by the “motor control circuit inspection apparatus” according to the present invention includes a control circuit that performs PWM control of the PF motor 58 that is a DC motor, and a DC circuit. A control circuit that performs PWM control of the CR motor 63 that is a motor and a control circuit (not shown) that controls drive of the recording head 62 are provided.

  The ASIC 103 performs various calculations for controlling the rotational speed and direction of the PF motor 58 based on the control command sent from the MPU 104 and the output signal of the rotary encoder 31 as the “feedback signal” of the PF motor 58. Then, a motor control signal based on the calculation result is sent to the PF motor driver 106. Further, the ASIC 103 performs various calculations for controlling the rotational speed and direction of the CR motor 63 based on the control command sent from the MPU 104 and the output signal of the linear encoder 32 as the “feedback signal” of the CR motor 63. And a motor control signal based on the calculation result is sent to the CR motor driver 107. Further, the ASIC 103 calculates and generates a control signal for the recording head 62 based on the recording data sent from the MPU 104 and sends it to the head driver 108 to drive-control the recording head 62.

  Next, a “method for inspecting a motor control circuit by feedback control” according to the present invention will be described.

FIG. 4 is a schematic configuration diagram of an inspection system for performing the “method for inspecting a motor control circuit by feedback control” according to the present invention.
The inspection apparatus 200 as a “motor control circuit inspection apparatus” according to the present invention includes an MPU 204 as an “inspection control apparatus” that executes arithmetic processing related to control of the inspection apparatus 200, a ROM 201 that is a read-only storage device, and arithmetic processing. RAM 202 which is a readable / writable storage device used as a work area or the like. In addition, the inspection apparatus 200 performs display output to the liquid crystal monitor 210, operation input from an input device (for example, a mouse or a keyboard) 211, and input / output with the recording control unit 100 as a “motor control circuit” to be inspected. It has an input / output IF 203 that implements an interface.

  The input / output IF 203 includes a “motor drive voltage waveform” of the PF motor 58 output from the PF motor driver 106, a “motor drive voltage waveform” of the CR motor 63 output from the CR motor driver 107, an output signal of the rotary encoder 31, and linear “A / D conversion means” that can also function as “analog signal input / output means” capable of inputting the output signal of the encoder 32 and convert these analog input signals into digital data at a predetermined sampling frequency. It also has a function as Further, the inspection apparatus 200 includes a “motor drive voltage waveform” of the PF motor 58 output from the PF motor driver 106, a “motor drive voltage waveform” of the CR motor 63 output from the CR motor driver 107, an output signal of the rotary encoder 31, and It has a readable / writable large-capacity external storage device 205 composed of an HDD (hard disk drive) or the like as “storage means” capable of storing digital data of the output signal of the linear encoder 32. Note that the external storage device 205 also stores programs, data files, and the like of the inspection device 200.

  The switching circuit DS1 has a configuration that can arbitrarily switch the connection state of the rotary encoder signal input port of the ASIC 103, the input / output port of the input / output IF 203, and the encoder signal output of the rotary encoder 31. The switching circuit DS2 has a configuration that can arbitrarily switch the connection state of the linear encoder signal input port of the ASIC 103, the input / output port of the input / output IF 203, and the encoder signal output of the linear encoder 32.

FIG. 5 is a schematic configuration diagram illustrating the configuration of the inspection system when performing the “normal circuit data acquisition step”. FIG. 6 is a flowchart showing a data acquisition procedure of the inspection apparatus 200 in the “normal circuit data acquisition step”. FIG. 7 schematically shows a timing chart at the time of data acquisition in the “normal circuit data acquisition step”.
In the “normal circuit data acquisition process” performed in advance prior to the inspection process of the recording control unit 100 to be inspected, the terminals b and c of the switching circuit DS1 and the terminals e and f of the switching circuit DS2 as shown in FIG. And connect. As a result, the output signal of the rotary encoder 31 and the output signal of the linear encoder 32 are output to both the ASIC 103 and the inspection apparatus 200, respectively. In such an inspection system configuration, the normal recording control unit 100 executes predetermined motor control to drive the PF motor 58 and the CR motor 63. This “predetermined motor control” is preferably motor control in the actual ink jet recording apparatus 50 executed by the recording control unit 100. For example, the actual conveyance control of the recording paper P is performed for the PF motor 58, and the reciprocation control of the actual carriage 61 is performed for the CR motor 63.

  Then, the driving voltage waveforms of the PF motor 58 and the CR motor 63 and the output signals (feedback signals) of the rotary encoder 31 and the linear encoder 32 at that time are all obtained by converting them into digital data at the same sampling frequency. To do. The acquired digital data of the drive voltage waveforms of the PF motor 58 and the CR motor 63 is stored in the external storage device 205 as the control signal determination profile 12 (normal circuit motor drive waveform data). The acquired digital data of the output signals (feedback signals) of the rotary encoder 31 and the linear encoder 32 is stored in the external storage device 205 as the input signal profile 11 (normal circuit feedback signal data) (normal circuit data acquisition step).

More specifically, description will be made with reference to the flowchart of FIG. 6 and the timing chart of FIG.
When a predetermined normal circuit data acquisition operation is performed in the inspection apparatus 200, a predetermined motor control start signal (start signal) is output from the inspection apparatus 200 to the normal recording control unit 100, and a DC motor (PF motor 58 and CR) is output. The drive of the motor 63) is started (step S1). Using the motor control start signal (start signal) at this time as a trigger, acquisition of the PWM control signal output by the normal PF motor driver 106 and the CR motor driver 107 and the normal output signal of the rotary encoder 31 and the linear encoder 32 is started. (FIG. 7). Subsequently, it is determined whether or not a predetermined time set as the data acquisition time has elapsed (step S2). If the predetermined time has not elapsed (No in step S2), a normal encoder signal (rotary encoder 31) is determined. And the output signal of the linear encoder 32) are sampled and converted into digital data, and stored in the external storage device 205 as the input signal profile 11 (step S3). At the same time, the PWM control signals (DC motor drive voltage waveforms) of the normal PF motor driver 106 and CR motor driver 107 at that time are sampled and converted into digital data, and stored in the external storage device 205 as the control signal determination profile 12. (Step S4). Then, when a predetermined time has elapsed (Yes in step S2), the predetermined motor control is ended and the procedure is ended (step S5). The input signal profile 11 and the control signal determination profile 12 need only be acquired and stored once, and can be used repeatedly when the same recording control unit 100 is inspected. Further, the input signal profile 11 and the control signal determination profile 12 may be acquired and stored separately for the PF motor 58 and the CR motor 63, respectively.

FIG. 8 is a schematic configuration diagram illustrating the configuration of an inspection system when performing the “inspection target circuit data acquisition step”. FIG. 9 is a flowchart showing a data acquisition procedure of the inspection apparatus 200 in the “inspection target circuit data acquisition step”. FIG. 10 schematically illustrates a timing chart at the time of data acquisition in the “inspection target circuit data acquisition step”.
In the “inspection circuit data acquisition step”, the terminals a and b of the switching circuit DS1 and the terminals d and e of the switching circuit DS2 are connected as shown in FIG. As a result, a “feedback signal” based on the input signal profile can be output from the inspection apparatus 200 to the ASIC 103 of the recording control unit 100 to be inspected. Further, a dummy resistor DR1 and a dummy resistor DR2 may be connected to the recording control unit 100 to be inspected instead of the PF motor 58 and the CR motor 63 as shown in the figure. As described above, in the “inspection target circuit data acquisition step”, the dummy resistance DR1 and the dummy resistance DR2 are connected in place of the real PF motor 58 and the CR motor 63, and the motor drive voltage waveform of the recording control unit 100 to be inspected. By acquiring the data, it is possible to prevent a decrease in pass / fail judgment accuracy due to the occurrence of spike noise.

  In such an inspection system configuration, for the ASIC 103 of the recording control unit 100 to be inspected, a feedback signal (a rotary encoder 31 and a linear encoder 32) during a predetermined motor control with respect to a normal motor control circuit reproduced from the input signal profile 11. The recording control unit 100 to be inspected executes a predetermined motor control while feeding back the output signal (A). The driving voltage waveforms of the PF motor 58 and the CR motor 63 at that time are acquired by converting into digital data at the same sampling frequency as the sampling frequency when the control signal determination profile 12 is acquired in the inspection apparatus 200. The acquired drive voltage waveforms of the PF motor 58 and the CR motor 63 are stored in the external storage device 205 as the control signal profile 13 (inspection target circuit motor drive waveform data) (inspection target circuit data acquisition step).

More specifically, description will be made with reference to the flowchart of FIG. 9 and the timing chart of FIG.
When a predetermined normal circuit data acquisition operation is performed in the inspection apparatus 200, a predetermined motor control start signal (start signal) is output from the inspection apparatus 200 to the recording control unit 100 to be inspected, and a DC motor (PF motor 58 and The driving of the CR motor 63) is started (step S11). Using the motor control start signal (start signal) at this time as a trigger, input of a feedback signal reproduced from the input signal profile 11 to the ASIC 103 of the recording control unit 100 to be inspected is started. At the same time, acquisition of PWM control signals output from the PF motor driver 106 and the CR motor driver 107 to be inspected is started (FIG. 10). Subsequently, it is determined whether or not a predetermined time set as the data acquisition time has elapsed (step S12). If the predetermined time has not elapsed (No in step S12), an input signal to the ASIC 103 to be inspected The input of the feedback signal reproduced from the profile 11 is continued as it is (step S13). Further, the PWM control signal (DC motor drive voltage waveform) of the PF motor driver 106 and the CR motor driver 107 of the recording control unit 100 to be inspected is sampled and converted into digital data, and the control of the recording control unit 100 to be inspected is performed. The signal profile 13 is stored in the external storage device 205 (step S14). Then, when a predetermined time has elapsed (Yes in step S12), the predetermined motor control is ended and the procedure is ended (step S15). The control signal profile 13 may be acquired and stored separately for the PF motor 58 and the CR motor 63, respectively.

FIG. 11 is a flowchart showing a data comparison procedure of the inspection apparatus 200 in the “data comparison process”.
First, the start address of the data of the control signal profile 13 acquired from the recording control unit 100 to be inspected and the data of the control signal determination profile 12 previously acquired from the normal recording control unit 100 are set (step S21). Specifically, the data start address of the control signal profile 13 acquired from the recording control unit 100 to be inspected and stored in the external storage medium 205 and the data start address acquired in advance from the normal recording control unit 100 and stored in the external storage medium 205 are stored. The data start address of the control signal determination profile 12 is set as the data comparison start address. Subsequently, the data of the control signal profile 13 acquired from the recording control unit 100 to be inspected and the data of the control signal determination profile 12 previously acquired from the normal recording control unit 100 are sequentially compared from the top of the data (step S22). ), It is determined whether or not there is a data mismatch for each predetermined data unit (step S23).

  The control signal determination profile 12 is motor drive voltage waveform data output from the PF motor driver 106 and the CR motor driver 107 of the normal recording control unit 100. On the other hand, the control signal profile 13 is data of the motor drive voltage waveform output from the PF motor driver 106 and the CR motor driver 107 of the recording control unit 100 to be inspected, for which feedback control by the same feedback signal (input signal profile 11) is executed. It is. Further, since the control signal determination profile 12 and the control signal profile 13 are converted to digital data at the same sampling frequency, they are synchronized in time. Therefore, by comparing the control signal determination profile 12 and the control signal profile 13, if the compared data matches, the recording control unit 100 to be inspected can be determined to be normal, and the compared both If the data do not match, it is possible to determine that the recording control unit 100 to be inspected is not normal.

  If there is no data mismatch (No in step S23), it is then determined whether or not the data has been compared up to the final address (step S24). If the data comparison has not been completed up to the final address (No in step S24), the data address of the control signal profile 13 acquired from the recording control unit 100 to be inspected and the control signal determination acquired from the normal recording control unit 100 in advance. The data address of the profile 12 for use is incremented together (step S25), and the process returns to step S22 to continue the data comparison for each predetermined data unit. If there is a data mismatch (Yes in step S23), it is determined that the recording control unit 100 to be inspected is not normal (step S26), and the procedure ends. On the other hand, if there is no mismatch as compared to the final address (Yes in step S24), the recording control unit 100 to be inspected is determined to be normal (step S27), and the procedure ends.

  Thus, the data of the control signal determination profile 12 of the normal recording control unit 100 and the control signal profile of the recording control unit 100 to be inspected when the feedback control by the same footback signal (input signal profile 11) is executed. By comparing 13 data, it is possible to quantitatively and accurately determine whether or not the drive voltage waveforms of the PF motor 58 and the CR motor 63 for feedback control are normal. Therefore, the quality determination of the recording control unit 100 that performs the feedback control based on the encoder signals fed back from the PF motor 58 and the CR motor 63 to be controlled (output signals of the rotary encoder 31 and the linear encoder 32) is quantitative and high. Can be performed with accuracy.

  The present invention is not particularly limited to the DC motor control by the pulse control method such as the PWM control method shown in the timing charts (FIGS. 7 and 10) in the embodiment, but the DC motor control by the analog control method. Further, the control signal determination profile 12 and the control signal profile 13 can be implemented with voltage change waveform data or current change waveform data. And this invention is not limited to the said Example, A various deformation | transformation is possible within the range of the invention described in the claim, and they are also contained in the scope of the present invention. Needless to say.

1 is a schematic plan view of an ink jet recording apparatus. 1 is a schematic side view of an ink jet recording apparatus. 1 is a schematic block diagram of an ink jet recording apparatus. 1 is a schematic configuration diagram of an inspection system using an inspection apparatus according to the present invention. The schematic structure of the test | inspection system at the time of performing a normal circuit data acquisition process. The flowchart which showed the data acquisition procedure of the test | inspection apparatus. The timing chart in a normal circuit data acquisition process. The schematic structure of the test | inspection system at the time of performing a test object circuit data acquisition process. The flowchart which showed the data acquisition procedure of the test | inspection apparatus. The timing chart in an inspection object circuit data acquisition process. The flowchart which showed the data comparison procedure of the test | inspection apparatus.

Explanation of symbols

DESCRIPTION OF SYMBOLS 11 Input signal profile, 12 Control signal determination profile, 13 Control signal profile, 31 Rotary encoder, 32 Linear encoder, 50 Inkjet recording device, 51 Carriage guide shaft, 52 Platen, 53 Conveyance drive roller, 54 Conveyance driven roller, 55 Paper discharge drive roller, 56 Paper discharge driven roller, 58 PF motor, 61 Carriage, 62 Recording head, 63 CR motor, 100 Recording control unit, 106 PF motor driver, 107 CR motor driver, 200 Inspection device, 201 ROM, 202 RAM , 203 I / O IF, 204 MPU, 205 External storage device, 210 LCD monitor, 211 Input device, DR1, DR2 dummy resistor, P recording paper, X main scanning direction, Y sub-scanning direction

Claims (6)

Normal circuit motor drive waveform data and normal circuit feedback obtained by converting the motor drive voltage or current waveform and feedback signal into the digital data at the same sampling frequency when the motor is driven by executing the predetermined motor control with the normal motor control circuit A normal circuit data acquisition step of acquiring and storing signal data in advance;
The predetermined motor control is executed while feeding back the feedback signal at the predetermined motor control for the normal motor control circuit reproduced from the normal circuit feedback signal data to the motor control circuit to be inspected, and the motor drive voltage at that time Or a test target circuit data acquisition step of acquiring and storing test target circuit motor drive waveform data obtained by converting the current waveform into digital data at the same sampling frequency as the sampling frequency at the time of obtaining the normal circuit motor drive waveform data;
The normal circuit motor drive waveform data is compared with the inspection target circuit motor drive waveform data. If they match, the motor control circuit to be inspected is determined to be normal, and if they do not match, the motor control circuit to be inspected is determined. A method for inspecting a motor control circuit by feedback control including a data comparison step for determining that the data is not normal.   2. The inspection method for a motor control circuit according to claim 1, wherein the feedback signal is a rotation speed signal of the motor.   3. The motor by feedback control according to claim 1, wherein the inspection target circuit data acquisition step acquires the inspection target circuit motor drive waveform data by connecting a dummy resistor to the inspection target motor control circuit. Control circuit inspection method. Analog signal input / output means capable of inputting motor drive voltage or current waveform of motor control circuit and feedback signal, and motor drive voltage or current waveform and feedback signal of motor control circuit to digital data at predetermined sampling frequency A / D conversion means capable of conversion, storage means capable of storing the motor drive voltage or current waveform and digital data of the feedback signal, analog input / output means, A / D conversion means and storage means are controlled. An inspection device for a motor control circuit by feedback control provided with an inspection control device for
The inspection control device is a normal circuit motor driving waveform obtained by converting a motor driving voltage or current waveform and a feedback signal into digital data at the same sampling frequency when a motor is driven by executing a predetermined motor control by a normal motor control circuit. Normal circuit data acquisition function for acquiring and storing data and normal circuit feedback signal data in advance;
The predetermined motor control is executed while feeding back the feedback signal at the predetermined motor control for the normal motor control circuit reproduced from the normal circuit feedback signal data to the motor control circuit to be inspected, and the motor drive voltage at that time Alternatively, an inspection target circuit data acquisition function for acquiring and storing inspection target circuit motor drive waveform data obtained by converting the current waveform into digital data at the same sampling frequency as the sampling frequency at the time of obtaining the normal circuit motor drive waveform data;
The normal circuit motor drive waveform data is compared with the inspection target circuit motor drive waveform data. If they match, the motor control circuit to be inspected is determined to be normal, and if they do not match, the motor control circuit to be inspected is determined. An inspection apparatus for a motor control circuit, characterized by having a data contrast function for determining that it is not normal.   5. The connection state in which feedback signals when the motor control circuit executes predetermined motor control and drives the motor are respectively output to both the motor control circuit and the analog signal input / output means, and motor control Instead of a feedback signal to the motor control circuit for the motor control of the circuit, it is possible to switch a connection state in which a feedback signal reproduced from the normal circuit feedback signal data is output from the analog signal input / output means to the motor control circuit An inspection apparatus for a motor control circuit, comprising a switching circuit having a configuration. Analog signal input / output means capable of inputting motor drive voltage or current waveform of motor control circuit and feedback signal, and motor drive voltage or current waveform and feedback signal of motor control circuit to digital data at predetermined sampling frequency In the inspection apparatus for a motor control circuit by feedback control, comprising: a convertible A / D conversion means; and a storage means capable of storing the motor drive voltage or current waveform and the digital data of the feedback signal. An inspection control program for causing a computer to execute control of the A / D conversion means and the storage means,
Normal circuit motor drive waveform data and normal circuit feedback signal obtained by converting the motor drive voltage or current waveform and feedback signal into the digital data at the same sampling frequency when the motor is driven by executing the predetermined motor control with the normal motor control circuit Normal circuit data acquisition procedure for acquiring and storing data in advance,
The predetermined motor control is executed while feeding back the feedback signal at the predetermined motor control for the normal motor control circuit reproduced from the normal circuit feedback signal data to the motor control circuit to be inspected, and the motor drive voltage at that time Alternatively, a test target circuit data acquisition procedure for acquiring and storing test target circuit motor drive waveform data obtained by converting the current waveform into digital data at the same sampling frequency as the sampling frequency at the time of obtaining the normal circuit motor drive waveform data;
The normal circuit motor drive waveform data is compared with the inspection target circuit motor drive waveform data. If they match, the motor control circuit to be inspected is determined to be normal, and if they do not match, the motor control circuit to be inspected is determined. An inspection control program characterized by having a data comparison procedure for determining that the data is not normal.

Images