JP4858595B2 - Meter system - Google Patents

Meter system Download PDF

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Publication number
JP4858595B2
JP4858595B2 JP2009251190A JP2009251190A JP4858595B2 JP 4858595 B2 JP4858595 B2 JP 4858595B2 JP 2009251190 A JP2009251190 A JP 2009251190A JP 2009251190 A JP2009251190 A JP 2009251190A JP 4858595 B2 JP4858595 B2 JP 4858595B2
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flasher
stopper
control unit
semiconductor switch
detection
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JP2011095175A (en
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秀行 中根
正明 丹羽
隆志 水谷
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株式会社デンソー
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Priority claimed from DE102010038241.8A external-priority patent/DE102010038241B9/en
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  The present invention relates to a meter system including a vehicle indicating instrument that swings a pointer by a step motor.
  Conventionally, there has been known a vehicle indicating instrument that rotates a pointer by applying a drive signal alternating according to an electrical angle to a field winding of a step motor to indicate a vehicle state value according to the rotation position of the pointer. It has been. In such a vehicle indicating instrument, the pointer is returned to the zero position indicating the zero value of the vehicle state value by rotating in the return zero direction. Further, the stopper mechanism stops at a stopper position within a predetermined range from the zero position to the return zero direction, and an electrical angle corresponding to the stopper position is used as a reference for drive signal control.
  For example, in the vehicle indicating instrument disclosed in Patent Document 1, an induced voltage generated in a field winding is detected while controlling a drive signal applied to the field winding of the step motor so as to drive the pointer to rotate in the direction of return to zero. is doing. As a result, an induced voltage is generated in the field winding while the pointer is rotating, and when the pointer is stopped, the induced voltage generated in the field winding is lowered. Therefore, if the detection voltage of the induced voltage generated in the field winding is less than the set value, it is estimated that the pointer has stopped at the stopper position (stopper position detection operation), and the electric power corresponding to the stopper position is estimated. The corner is set to update. According to such a series of processing, even if the stepping motor steps out due to disturbances such as vibration before starting the indicator instrument and the rotational position of the pointer is shifted, the drive signal is accurately calculated based on the updated electrical angle. It becomes possible to control.
Japanese Patent No. 3770095
  By the way, the meter system has a flasher device that performs turn lamps (hazard lamps), buzzers, and flashing control of the buzzer that blows in conjunction with the flashing of the lamp, in addition to the above-mentioned vehicle indicating instrument. I have. In recent years, it has been considered to integrate the system by incorporating such a function of the flasher device (flasher function) into the above-mentioned indicator for a vehicle and reduce the production cost of the vehicle.
  However, when the flasher function is incorporated into the vehicle indicating instrument, the field winding constituting the vehicle indicating instrument and the flasher semiconductor switch for flashing the flasher may be close to each other in the meter system. Further, in order to blink the flasher, it is necessary to turn on and off the semiconductor switch, and induction noise is generated by turning on and off the semiconductor switch. Therefore, if the semiconductor switch of the flasher function unit is operated during the stopper position detection operation, erroneous detection of the stopper position may occur due to the induction noise, and the stopper position may be shifted. As a result, there is a possibility that a problem that the vehicle state value cannot be correctly indicated can occur.
  In addition, in order to execute the stopper position detection operation, a predetermined stopper position detection operation execution condition needs to be satisfied, and it is highly likely that the pointer is separated from the stopper position in the stopper position detection operation execution condition. There is a high necessity execution condition in which it is highly necessary to promptly execute the stopper position detection operation, and a confirmation execution condition to be executed in order to make sure that the pointer is not likely to be away from the stopper position. When the high necessity execution condition is satisfied, the necessity of executing the stopper position detection operation is high. On the other hand, when the confirmation execution condition is satisfied, the necessity of executing the stopper position detection operation is not so high. When the stopper position detection operation is executed, the vehicle state value can be correctly indicated, but the user feels uncomfortable because the pointer rotates in the direction of zero return even though no operation is performed by the user. May be given.
  The present invention has been made in view of the above circumstances, and an object thereof is to reduce the occurrence of an inaccurate indication of the vehicle state value and the discomfort to the user while integrating the system. It is to provide a meter system that can be used.
  In order to achieve such an object, according to the first aspect of the present invention, when it is determined that the high necessity execution condition is satisfied, the drive control unit detects the stopper position regardless of whether the flasher drive condition is satisfied or not. The flasher on / off switching control unit does not execute the on / off switching control of the flasher semiconductor switch while the stopper position detection operation is being performed by the drive control unit. That is, the stopper position detection operation is executed with priority. On the other hand, when it is determined that the confirming execution condition and the flasher driving condition are satisfied at the same time, the flasher on / off switching control unit controls on / off of the flasher semiconductor switch, and the drive control unit controls the flasher semiconductor switch. Stopper position detection operation is not executed while ON / OFF is controlled. That is, priority is given to the on / off switching control of the flasher semiconductor switch.
  Thus, according to the first aspect of the present invention, the stopper position detection operation and the flasher semiconductor switch are turned on / off regardless of whether the high necessity execution condition is satisfied or the confirming execution condition is satisfied. The switching control is not executed at the same time. Therefore, the stopper position detected by the stopper position detection operation is not affected by the induction noise generated by turning on and off the flasher semiconductor switch, and corresponds to the stopper position that is less likely to be influenced by the induction noise by the drive control unit. The electrical angle is set as the zero point. And since possibility that an inaccurate zero will become a standard of a drive signal becomes low, it becomes possible to reduce that an inaccurate indication of a vehicle state value occurs. Therefore, according to the first aspect of the present invention, it is possible to reduce the occurrence of an inaccurate indication of the vehicle state value and discomfort to the user while integrating the system.
  Note that the flasher function unit may include not only the flasher but also a buzzer that sounds in conjunction with the flashing of the flasher. In this case, as in the invention described in claim 2, in order to integrate the vehicle indicating instrument and the flasher function unit as a meter system, at least one of a flasher semiconductor switch and a buzzer semiconductor switch constituting the flasher function unit And the field winding of the step motor may be arranged close to each other.
  Therefore, in the invention according to claim 2, when it is determined that the high necessity execution condition is satisfied, the drive control unit executes the stopper position detection operation regardless of whether the flasher drive condition is satisfied or not. The flasher on / off switching control unit performs switching control of on / off of the semiconductor switch arranged in the state adjacent to the field winding among the flasher semiconductor switch and the buzzer semiconductor switch while the stopper position detection operation is performed by the drive control unit. do not do. That is, the stopper position detection operation is executed with priority. On the other hand, when it is determined that the confirmation execution condition and the flasher driving condition are satisfied at the same time, the flasher on / off switching control unit and the buzzer on / off switching control unit perform on-off control of the flasher semiconductor switch and the buzzer semiconductor switch. The drive control unit does not execute the stopper position detection operation while the on / off control of the semiconductor switch arranged in the state close to the field winding among the flasher semiconductor switch and the buzzer semiconductor switch is being controlled. That is, priority is given to the on / off switching control of the semiconductor switch.
  As described above, according to the second aspect of the present invention, the stopper position detection operation and the semiconductor switch ON / OFF can be performed regardless of whether the high necessity execution condition is satisfied or the confirmation execution condition is satisfied. Do not execute switching control at the same time. Therefore, the stopper position detected by the stopper position detection operation is not affected by inductive noise generated by the on / off of the semiconductor switch arranged in the state close to the field winding among the flasher semiconductor switch and the buzzer semiconductor switch, The electrical angle corresponding to the stopper position that is unlikely to be affected by the induction noise by the drive control unit is set as the zero point. And since possibility that an inaccurate zero will become a standard of a drive signal becomes low, it becomes possible to reduce that an inaccurate indication of a vehicle state value occurs. Therefore, according to the second aspect of the present invention, it is possible to reduce the inaccurate indication of the vehicle state value and the feeling of discomfort to the user while integrating the system.
  In the case of being arranged close to each other, the system was integrated by arranging at least one of the flasher semiconductor switch and the buzzer semiconductor switch and the field winding of the step motor on the same substrate. There is a case. Alternatively, the system may be integrated by configuring the drive control unit and at least one of the flasher on / off switching control unit and the buzzer on / off switching control unit with the same control device.
  By the way, for example, in the situation where the performance of the battery power source is remarkably deteriorated, when the ignition switch is turned on, various devices including the drive control unit are only temporarily activated and then stopped. If the ignition switch is turned on again after the operation is stopped, various devices may start up normally.
  Specifically, before the ignition switch is turned on, various devices including the drive control unit are not operating and the load is light, so the supply voltage from the battery power supply exceeds the operating voltage of the various devices. Various devices are temporarily activated. After the various devices are started up, the various devices start to operate and the load becomes heavy. Therefore, the supply voltage from the battery power supply falls below the operating voltage of the various devices, and the various devices stop operating (low Voltage reset). However, when the ignition switch is turned on again after the operation is stopped, the supply voltage from the battery power supply again exceeds the operating voltage of the various devices, and the various devices start operating. At this time, when the alternator operates to generate power, various devices may continue to operate (return from low voltage reset).
  When returning from such a low-voltage reset, it is highly likely that various devices will operate temporarily before the return and stop operating without returning the pointer to the stopper position. There is a high possibility that they are separated from each other, and there is a high need to immediately execute the stopper position detection operation.
  Here, a high-necessity execution condition is a low-voltage reset in which the drive control unit stops operation due to a decrease in supply voltage to the drive control unit, and then recovers when the supply voltage increases after the operation stop It is a return from. Specifically, as in the invention described in claim 3, the high necessity execution condition is that the drive control unit is activated in a state where the supply voltage to the drive control unit is lower than a predetermined threshold. Good. Thereby, when returning from the low voltage reset, the stopper position detection operation can be executed in preference to the on / off switching control of the semiconductor switch.
  On the other hand, for example, in a situation where the performance of the battery power source has not deteriorated so much, even if the ignition switch is turned on, the low voltage is rarely reset. If the voltage is not reset, there is a high possibility that the pointer will return to the stopper position and the operation will stop.Therefore, it is unlikely that the pointer is away from the stopper position, and it is necessary to execute the stopper position detection operation. The nature is low.
  Here, the confirming execution condition is not normal recovery from the low voltage reset but normal startup. Specifically, as in the invention described in claim 4, the confirming execution condition may be that the drive control unit is activated in a state where the supply voltage to the drive control unit is equal to or higher than a predetermined threshold. . As a result, the semiconductor switch ON / OFF switching control can be executed prior to the stopper position detection operation at the normal startup.
It is a front view which shows the front structure about one Embodiment of the meter system which concerns on this invention. It is sectional drawing along the II-II line | wire in FIG. It is a block diagram which shows the electric circuit structure about the meter system of this Embodiment. It is a perspective view which shows the principal part from a perspective direction about the meter system of this Embodiment. It is a top view which shows the principal part from the plane direction about the meter system of this Embodiment. It is a characteristic view which shows an example of the drive signal applied to the field winding of the step motor about the meter system of this Embodiment. It is a front view which shows the state which the pointer stopped at the stopper position about the meter system of the form of the present invention from the front. It is a flowchart which shows an example of the process sequence about the meter starting process performed by the meter system of this Embodiment. It is a flowchart which shows an example of the process sequence about the modification of the meter starting process performed by the meter system of this Embodiment.
  Hereinafter, an embodiment of a meter system according to the present invention will be described with reference to FIGS. In the present embodiment, the meter system 1 is assumed to be installed in front of the driver's seat in the vehicle as a speedometer.
  As shown in FIGS. 1 to 3, the meter system 1 includes a vehicle indicating instrument 1 a having an instrument panel 10, a pointer 20, a rotary inner unit 30, a substrate 40, and a control unit 60. .
  As shown in FIG. 1, the instrument panel 10 has a vehicle speed display unit 11 for displaying a vehicle speed value on a display surface 10 a, and the display surface 10 a is arranged toward the driver's seat side. The vehicle speed display unit 11 has a plurality of vehicle speed values (0 km / h, 20 km / h,..., 160 km / h) from a zero value (0 km / h) as a reference of the vehicle speed value to an upper limit value (180 km / h). 180 km / h) is displayed in an arc shape. The vehicle speed value corresponds to the vehicle state value described in the claims, and the instrument panel 10 corresponds to the scale plate described in the claims.
  As shown in FIG. 1 and FIG. 2, the pointer 20 is connected to the pointer shaft 30 b of the rotary inner unit 30 on the base end portion 21 side, and in the return zero direction X and the opposite zero direction Y. It can be rotated along the display surface 10 a of the instrument panel 10. The pointer 20 indicates a value corresponding to the rotational position among the vehicle speed values displayed on the vehicle speed display unit 11 by rotating in the nulling direction X or the zeroing direction Y. The pointer 20 can be returned to the zero position indicating the zero value by rotating in the return zero direction X. In the present embodiment, the nulling direction X is a direction from the upper limit value toward the zero value, and the separation zero direction Y is a direction from the zero value toward the upper limit value.
  As shown in FIG. 2, the turning inner unit 30 includes an inner unit main body 30a, a pointer shaft 30b, and a casing 30c. The internal unit main body 30 a is disposed on the back side of the substrate 40 substantially parallel to the instrument panel 10. The internal machine main body 30a incorporates a two-phase step motor M, a reduction gear mechanism G, and a stopper mechanism S (FIG. 4) in a casing 30c. The pointer shaft 30 b is supported by a casing 30 c fixed to the back surface of the substrate 40, and supports the proximal end portion 21 of the pointer 20 through the substrate 40 and the instrument panel 10. The internal machine main body 30a rotationally drives the pointer shaft 30b coaxially with the output stage gear 34 of the reduction gear mechanism G and consequently the pointer 20 by the reduction rotation of the reduction gear mechanism G interlocking with the rotation of the step motor M.
  As shown in FIGS. 4 and 5, the step motor M is configured by combining a stator Ms and a magnet rotor Mr. The stator Ms has a yoke 31 and two-phase field windings 32 and 33. The yoke 31 has a pair of magnetic poles 31a and 31b having a pole shape, and an A-phase field winding 32 is wound around the magnetic pole 31a, while a B-phase field winding 33 is wound around the magnetic pole 31b. It is wound. The magnet rotor Mr is coaxially fixed to the rotation shaft 35a of the reduction gear mechanism G. N poles and S poles as magnetic poles are alternately formed in the rotation direction on the outer circumferential surface of the magnet rotor Mr that opens a gap between the magnetic poles 31a and 31b of the yoke 31.
  In the step motor M having such a configuration, as shown in FIG. 6, an AC A-phase drive signal whose voltage alternates in a cosine function according to the electrical angle is applied to the A-phase field winding 32. On the other hand, an alternating B-phase drive signal whose voltage alternates in a sine function according to the electrical angle is applied to the B-phase field winding 33. When such A-phase and B-phase drive signals that are 90 degrees out of phase with each other are applied, an alternating magnetic flux is generated in each of the field windings 32 and 33, and the generated alternating magnetic flux is converted into the yoke 31 and the magnet rotor Mr. Pass between the magnetic poles. The magnet rotor Mr rotates in accordance with the voltage change of the A-phase and B-phase drive signals according to the electrical angle.
  As shown in FIG. 4, the reduction gear mechanism G has a plurality of gears 34 to 37 made of spur gears. The output stage gear 34 is coaxially connected to the pointer shaft 30b, and the input stage gear 35 is coaxially fixed to the rotary shaft 35a supported by the casing 30c. The intermediate gears 36 and 37 are coaxially supported by a rotating shaft 36a fixed to the casing 30c, so that they can rotate integrally. The intermediate gear 36 meshes with the output stage gear 34, and the intermediate gear 37 meshes with the input stage gear 35.
  With this configuration, the reduction gear mechanism G reduces the rotation of the magnet rotor Mr of the step motor M and transmits the reduced rotation to the pointer 20. Therefore, when the rotational position of the magnet rotor Mr changes according to the change of the A-phase and B-phase drive signals according to the electrical angle, the rotational position of the pointer 20 also changes. In the present embodiment, the direction in which the electrical angle is decreased corresponds to the zero return direction X of the pointer 20, and the direction in which the electrical angle is increased corresponds to the zeroing direction Y of the pointer 20.
  As shown in FIG. 4, the stopper mechanism S includes a contact member 38 and a stopper member 39. The abutting member 38 is formed in a strip plate shape protruding from the output stage gear 34, and can rotate integrally with the gear 34. The stopper member 39 is formed in an L shape that protrudes inward from the casing 30 c, and the protruding end 39 a is on the side corresponding to the return zero direction X with respect to the contact member 38 on the rotation track of the contact member 38. Is located.
  As shown in FIG. 7, the pointer 20 has a predetermined range from the zero position to the zero return direction X in a state where the contact member 38 is locked to the tip end portion 39 a of the stopper member 39 by the rotation in the zero return direction X. It stops at the inner stopper position. In the present embodiment, in the ZPD process described later, the electrical angle corresponding to the stopper position is updated and set as the zero point θ0 (0 degree) (see FIG. 8). Incidentally, when the meter system 1 is manufactured, the stopper position is set within a range of, for example, 450 degrees in terms of the electrical angle of the step motor M from the zero position of the pointer 20 to the zero return direction X.
  As shown in FIG. 3, the meter system 1 includes a flasher function unit 50 having an indicator 51, a flasher semiconductor switch 52, a buzzer 53, and a buzzer semiconductor switch 54.
  Among these, the indicator 51 is disposed on the display surface 10 a (not shown in FIG. 1), and is connected to the control unit 60 via the flasher semiconductor switch 52. When the flasher semiconductor switch 52 is turned on, the indicator 51 is supplied with power from the control unit 60 and is lit. On the other hand, when the flasher semiconductor switch 52 is turned off, the power from the control unit 60 is turned on. It is shut off and turned off. Then, the on / off switching of the flasher semiconductor switch 52 is controlled by the control unit 60, so that the indicator 51 blinks.
  Further, the buzzer 53 is connected to the control unit 60 via the buzzer semiconductor switch 54. When the buzzer semiconductor switch 54 is turned on, the buzzer 53 is supplied with power from the control unit 60, and when the buzzer semiconductor switch 54 is turned off, the buzzer 53 is powered by the control unit 60. It is blocked and does not sound. The control unit 60 controls the on / off of the buzzer semiconductor switch 54 in conjunction with the on / off of the flasher semiconductor switch 52, so that the buzzer 53 sounds in conjunction with the indicator 51.
  Note that the indicator 51 is illustrated as a single indicator in FIG. 3 for the sake of convenience, but actually, the right turn blinks in synchronization with the blinking of a turn lamp for right turn (not shown) to indicate that the vehicle turns right. And a left turn indicator that blinks in synchronization with blinking of a left turn turn lamp (not shown) for indicating that the vehicle makes a left turn. The indicator 51 corresponds to the flasher described in the claims.
  The control unit 60 is mainly composed of a microcomputer having a memory 61, and is mounted on the substrate 40 (FIG. 2). The memory 61 stores an execution program for executing meter activation processing (including stopper position detection operation, zero point setting operation, ZPD processing, etc.) S1 described later, and the meter activation processing S1 is executed. The latest zero point θ0 set (updated) is also stored. In addition, the memory 61 has a storage area for a ZPD flag indicating that the ZPD processing has been executed while the control unit 60 is being activated.
  The control unit 60 is electrically connected to the flasher function unit 50, the vehicle door sensor 70, the vehicle speed sensor 71, the ignition switch IG, and the battery power source B. When the door sensor 70 detects the opening of the vehicle door, the control unit 60 is activated by direct power supply from the battery power source B. In addition, when the ignition switch IG is turned on until a set time (for example, 2 minutes) elapses after activation, the control unit 60 maintains the activation state by power supply from the battery power supply B, and thereafter the ignition unit IG When the switch IG is turned off, it sleeps. On the other hand, the control unit 60 sleeps when the ignition switch IG is not turned on until the set time elapses after activation, and restarts when the ignition switch IG is turned on after the sleep. The restart after the sleep may be performed, for example, when the vehicle door is opened or when the brake pedal is depressed, in addition to when the ignition switch IG is turned on. The control unit 60 sets the ZPD flag when the ZPD process is executed during the activation, and resets the ZPD flag immediately before going to sleep. As will be described later, the control unit 60 determines whether the voltage (supply voltage) supplied from the battery power source B is equal to or higher than a predetermined threshold or lower than the predetermined threshold at the time of starting. It is determined whether it is “recovery from low voltage reset” or “normal start”. In the present embodiment, for example, “7 [V]” is employed as the predetermined threshold, but the present invention is not limited to this, and “8 [V]”, “6 [V]”, or the like may be employed.
  The control unit 60 executes the stopper position detection operation when a predetermined stopper position detection operation execution condition is satisfied. Here, the outline of the stopper position detection operation will be described. The field windings 32 and 33 of the step motor M are arranged so that the pointer 20 once rotates in the zeroing direction Y and then rotates in the zeroing direction X. The induced voltage generated in the field windings 32 and 33 is detected while controlling the A-phase and B-phase drive signals applied to the pointer 20 and the pointer 20 is stopped at the stopper position using the detected induced voltage. This is an operation for detecting. Since this stopper position detection operation is publicly known, detailed description thereof is omitted here.
  Further, the stopper position detection operation execution condition is that the control unit 60 is activated. For example, the control unit 60 opens the vehicle door, turns on the ignition switch IG, or depresses the brake pedal. Start with that. Further, the control unit 60 executes a zero point setting operation which is an operation for setting (updating) the electrical angle corresponding to the stopper position detected by executing the stopper position detecting operation as the zero point θ0. Therefore, the control unit 60 corresponds to the zero point setting means described in the claims. The stopper position detection operation and the zero point setting operation are also referred to as ZPD processing. The control unit 60 applies the A-phase and B-phase drive signals to the field windings 32 and 33 of the step motor M with reference to the zero point θ0 set by executing the ZPD process. The control unit 60 corresponds to a stopper position detection operation execution means, a zero point setting means, an application means, and a drive control section described in the claims.
  The control unit 60 detects the vehicle speed sensor 71 by controlling the A-phase and B-phase drive signals based on the zero point θ0 of the electrical angle stored in the memory 61 in the start-up state after execution of the ZPD process. The vehicle speed value is instructed to the pointer 20.
  Further, the control unit 60 determines whether or not a predetermined flasher driving condition based on a manual operation of the user is satisfied, and when determining that the flasher driving condition is satisfied, the control unit 60 responds to the flasher driving condition determined to be satisfied. In order to blink the flasher in this manner, the on / off control of the flasher semiconductor switch 52 and the buzzer semiconductor switch 54 is controlled.
  Specifically, the flasher driving conditions include, for example, a combination lever (not shown) that blinks a right turn turn lamp that indicates that the vehicle turns right or blinks a left turn turn lamp that indicates that the vehicle turns left. The blinking position (position shifted by a predetermined angle in the vertical direction from the reference position) is set, and the hazard lamp switch (not shown) for blinking both the right turn turn lamp and the left turn turn lamp is set to the on state. It is included.
  Then, when the combination lever is set at a position where the right turn turn lamp blinks, the control unit 60 flashes so that the right turn indicator blinks and the buzzer 53 sounds in conjunction with the blinking of the right turn turn lamp. On / off control of the semiconductor switch 52 and the buzzer semiconductor switch 54 is controlled. Similarly, when the combination lever is set at a position where the left turn turn lamp blinks, the control unit 60 causes the left turn indicator to blink in conjunction with the blinking of the left turn turn lamp and the buzzer 53 to sound. On / off control of the flasher semiconductor switch 52 and the buzzer semiconductor switch 54 is controlled. Further, when the hazard lamp switch is set to the on state, the control unit 60 flashes so that the indicator 51 blinks and the buzzer 53 sounds in conjunction with blinking of both the right turn turn lamp and the left turn turn lamp. On / off control of the semiconductor switch 52 and the buzzer semiconductor switch 54 is controlled. The control unit 60 corresponds to a flasher on / off switching control unit and a buzzer on / off switching control unit described in the claims.
  Here, in the meter system 1 of the present embodiment, the field windings 32 and 33 constituting the step motor M are arranged on the substrate 40, and the flasher semiconductor switch 52 and the buzzer constituting the flasher function unit 50 are arranged. The semiconductor switch 54 is also disposed on the same substrate 40, and is disposed on the same substrate 40.
  In the meter system 1 according to the present embodiment, the same control unit 60 executes the ZPD process and the on / off switching control of both the flasher semiconductor switch 52 and the buzzer semiconductor switch 54.
  Thus, by integrating the vehicle indicating instrument 1a and the flasher function unit 50 as the meter system 1, the system cost of the vehicle can be reduced. The field windings 32 and 33, the flasher semiconductor switch 52, and the buzzer semiconductor switch 54 are arranged close to each other.
  When the field windings 32 and 33, the flasher semiconductor switch 52, and the buzzer semiconductor switch 54 are arranged close to each other, when the flasher function unit 50 operates when the ZPD processing of the step motor M is performed, the flasher semiconductor switch 52 and the buzzer semiconductor switch 54 may cause erroneous detection of the stopper position due to induction noise generated by the on / off switching control of the buzzer semiconductor switch 54, and the stopper position may be shifted. As a result, there is a possibility that a problem that the vehicle speed value (vehicle state value) cannot be correctly indicated can occur.
  Further, in order to execute the stopper position detection operation, it is necessary to satisfy a predetermined stopper position detection operation execution condition, and it is highly possible that the pointer 20 is separated from the stopper position in the stopper position detection operation execution condition. Therefore, there is a high necessity execution condition where the necessity of promptly executing the stopper position detection operation is high, and a confirmation execution condition executed for the sake of completeness although the possibility that the pointer 20 is far from the stopper position is low. . When the high necessity execution condition is satisfied, the necessity of executing the stopper position detection operation is high. On the other hand, when the confirmation execution condition is satisfied, the necessity of executing the stopper position detection operation is not so high. In addition, when the stopper position detection operation is executed, the vehicle speed value can be correctly indicated, but the user feels uncomfortable because the pointer rotates in the return zero direction without any operation. May give.
  Therefore, in the present embodiment, the control unit 60 executes the meter activation process S1 shown in FIG. 8 immediately after the activation. As described above, the stopper position detection operation execution condition is that the control unit 60 is activated. Therefore, the stopper position detection operation execution condition is satisfied when the control unit 60 is activated.
  When the control unit 60 starts executing the meter activation process S1 immediately after the activation, first, as a determination process in step S11, by determining whether the supply voltage of the battery power source B is equal to or higher than a predetermined threshold value or lower than the predetermined threshold value. , It is determined whether or not “return from low voltage reset”.
  Here, “return from low voltage reset” will be described. That is, for example, in a situation where the performance of the battery B is remarkably deteriorated, when the ignition switch IG is turned on, various devices (including the control unit 60) mounted on the vehicle are only temporarily activated and thereafter When the operation is stopped and the ignition switch IG is turned on again after the operation stops, various devices may start up normally.
  Specifically, before the ignition switch IG is turned on, since the various devices are not operating and the load is light, the supply voltage of the battery power supply B exceeds the operating voltage of the various devices. Start up automatically. After the various devices are started up, the various devices start to operate and the load becomes heavy. Therefore, the supply voltage of the battery power supply B decreases and falls below the operating voltage of the various devices, and the various devices stop operating. (Low voltage reset).
  However, when the ignition switch IG is turned on after the operation is stopped, the supply voltage of the battery power supply B rises and again exceeds the operation voltages of various devices, and the operation starts. At this time, the alternator operates to generate power, whereby various devices may continue to operate (return from low voltage reset).
  At the time of recovery from such a low voltage reset, various devices temporarily operate before the recovery, and it is highly possible that the operation has stopped without performing the process of returning the pointer 20 to the stopper position. There is a high possibility that the position is far from the position, and there is a high need to immediately execute the stopper position detection operation.
  On the other hand, for example, in a situation where the performance of the battery power source B has not deteriorated so much, even if the ignition switch IG is turned on, the low voltage is rarely reset. If the voltage is not reset, there is a high possibility that the operation of the pointer 20 is returned to the stopper position and the operation is stopped. Therefore, the possibility that the pointer 20 is separated from the stopper position is low, and the stopper position detection operation is executed. Low need to do.
  Therefore, when it is determined in the determination process of step S11 that the return is from the low voltage reset (“Yes” in the determination process of step S11), it means that the high necessity execution condition is satisfied. In this case, the control unit 60 executes the ZPD process (regardless of whether or not the flasher driving condition is satisfied) as the process of the subsequent step S12, and proceeds to the determination process of the subsequent step S13.
  On the other hand, if it is not determined in the determination process of step S11 that the recovery from the low voltage reset is made (“No” in the determination process of step S11), it means that the confirming execution condition is satisfied. In this case, the control unit 60 proceeds to the determination process in the subsequent step S13 without executing the ZPD process.
  In step S13, the control unit 60 determines whether the flasher driving condition is satisfied. If it is determined that the flasher driving condition is satisfied (“Yes” in the determination process of step S13), the control unit 60 responds to the flasher driving condition determined to be satisfied as the process of step S14. In order to make the indicator 51 blink in the above-described manner and to sound the buzzer 53 in conjunction with the blinking, the on / off control of the flasher semiconductor switch 52 and the buzzer semiconductor switch 54 is controlled. When the on / off control of the semiconductor switches 52 and 54 is controlled, the control unit 60 proceeds to the determination process of step S13 and executes again. On the other hand, when it is not determined that the flasher driving condition is satisfied (“No” in the determination process in step S13), the control unit 60 proceeds to the determination process in step S13 and executes again.
  In this manner, the control unit 60 executes the ZPD process (regardless of whether the flasher driving condition is satisfied or not satisfied) when the high necessity execution condition is satisfied, and the flasher while the ZPD process is being executed. The on / off switching control of the semiconductor switch 52 and the buzzer semiconductor switch 54 is not executed. Therefore, the stopper position detection operation can be executed with priority. On the other hand, when it is determined that the confirming execution condition and the flasher driving condition are satisfied at the same time, the control unit 60 controls on / off of the flasher semiconductor switch 52 and the buzzer semiconductor switch 54, and these flasher semiconductor switches 52. The ZPD process is not executed while the on / off control of the buzzer semiconductor switch 54 is being controlled. For this reason, the on / off switching control of the flasher semiconductor switch 52 and the buzzer semiconductor switch 54 can be executed with priority.
  In addition, the control unit 60 switches the ZPD processing and the flasher semiconductor switch 52 and the buzzer semiconductor switch 54 between on and off, regardless of whether the high necessity execution condition is satisfied or the confirmation execution condition is satisfied. Do not execute control at the same time. Therefore, the stopper position detected by the stopper position detection operation is not affected by the induction noise generated by the on / off of the flasher semiconductor switch 52 and the buzzer semiconductor switch 54, and may have been affected by the induction noise by the control unit 60. The electrical angle corresponding to the low stopper position is set as the zero point θ0. Since the possibility that the inaccurate zero point θ0 becomes the reference of the drive signal is reduced, it is possible to reduce the occurrence of an inaccurate indication of the vehicle speed value (vehicle state value).
  As described above, according to the meter system 1, it is possible to further reduce the occurrence of an inaccurate indication of the vehicle state value and the user's discomfort while integrating the system.
  The meter system 1 according to the present invention is not limited to the configuration exemplified in the above embodiment, and can be implemented with various modifications without departing from the gist of the present invention. . In other words, for example, the following embodiment can be implemented by appropriately changing the above embodiment.
  In the meter system 1 of the above embodiment, the meter activation process S1 (FIG. 8) that does not execute the ZPD process when the high necessity execution condition is not satisfied (that is, the confirming execution condition is satisfied). However, the present invention is not limited to this, and the meter activation process S1a shown in FIG. 9 may be executed as a diagram corresponding to FIG. Specifically, if it is not determined in the determination process in step S13 that the flasher drive condition is satisfied (“No” in the determination process in step S13), the high necessity execution condition is not satisfied, but it is confirmed. It means that the execution condition is satisfied. Therefore, if it is not determined that the flasher driving condition is satisfied in the determination process of the previous step S13 (“No” in the determination process of step S13), the control unit 60 performs the memory 61 as the determination process of the subsequent step S15. It is determined whether the ZPD process has already been executed by determining whether the ZPD flag stored in is set or reset. Here, when the ZPD flag is reset and it is not determined that the ZPD process has been executed (“No” in the determination process of step S15), the control unit 60 performs the ZPD process as the process of the subsequent step S16. Execute. On the other hand, when it is determined that the ZPD flag is set and the ZPD process has been executed, the control unit 60 proceeds to the determination process of the previous step S13 and executes the determination process of step S13 again.
  In the meter system 1 of the above embodiment, both the field windings 32 and 33 and both the flasher semiconductor switch 52 and the buzzer semiconductor switch 54 are arranged on the same substrate 40 and have the same control. The unit 60 is configured to execute the ZPD processing and the on / off switching control of both the flasher semiconductor switch 52 and the buzzer semiconductor switch 54, but is not limited thereto. Although both the field windings 32 and 33 and both the flasher semiconductor switch 52 and the buzzer semiconductor switch 54 are arranged on the same substrate 40, the control unit for performing the ZPD processing, the semiconductor switch 52, The control unit that performs both on / off switching control of 54 may be a separate control device, and the same control unit 60 controls on / off switching of both the ZPD processing and the flasher semiconductor switch 52 and the buzzer semiconductor switch 54. However, both the field windings 32 and 33 and the flasher semiconductor switch 52 and the buzzer semiconductor switch 54 may not be arranged on the same substrate.
  The field windings 32 and 33 and both the flasher semiconductor switch 52 and the buzzer semiconductor switch 54 are not limited to be arranged on the same substrate 40, and either the field windings 32 or 33 are used. And only one of the flasher semiconductor switch 52 and the buzzer semiconductor switch 54 may be arranged on the same substrate 40.
  The control unit 60 may be configured to execute at least one of the ZPD processing and the on / off switching control of both the flasher semiconductor switch 52 and the buzzer semiconductor switch 54.
DESCRIPTION OF SYMBOLS 1 ... Meter system, 1a ... Indicator instrument for vehicles, 10 ... Instrument board, 10a ... Display board, 20 ... Pointer, 30 ... Turning inner machine, 30a ... Inner machine main body, 32, 33 ... Field winding, 40 ... Substrate, 50 ... flasher function unit, 51 ... indicator (flasher), 52 ... flasher semiconductor switch, 53 ... buzzer, 54 ... buzzer semiconductor switch, 60 ... control unit (control device), 61 ... memory, 71 ... door sensor, 71 ... Vehicle speed sensor, G ... reduction gear mechanism, M ... step motor, S ... stopper mechanism, X ... zero return direction, Y ... zero release direction, .theta.0 ... zero point

Claims (4)

  1. A pointer that indicates the vehicle state value according to the rotation position by rotating along a display surface of a scale plate that displays the vehicle state value;
    A step motor that rotationally drives the pointer by applying a drive signal alternating according to the electrical angle to the field winding;
    A stopper mechanism that stops the pointer that rotates in the zero return direction from a zero position that indicates a zero value of the vehicle state value to a stopper position that is within a predetermined range in the zero return direction;
    Based on the establishment of a predetermined stopper position detection operation execution condition, an induced voltage generated in the field winding is detected while controlling the drive signal so that the pointer rotates in the return zero direction. Stopper position detection operation executing means for executing a stopper position detection operation for detecting that the pointer has stopped at the stopper position using the detected induced voltage, and a stopper position detected by executing the stopper position detection operation A drive control unit comprising: zero point setting means for setting an electrical angle corresponding to the zero point as a zero point; and application means for applying the drive signal based on the zero point set by the zero point setting means to the field winding; And a vehicle indicating instrument having
    A flasher semiconductor switch,
    A flasher that blinks when on / off of the flasher semiconductor switch is controlled to be switched;
    It is determined whether or not a predetermined flasher driving condition based on a manual operation by a user is satisfied, and when it is determined that the flasher driving condition is satisfied, the flasher is operated in a manner corresponding to the flasher driving condition determined to be satisfied. A flasher on / off switching control unit for switching on / off of the flasher semiconductor switch for blinking, a meter system including a flasher function unit,
    The drive control unit has a high necessity execution condition that is highly necessary to promptly execute the stopper position detection operation and a low necessity to promptly execute the stopper position detection operation as the stopper position detection operation execution condition. With confirmatory execution conditions,
    The flasher semiconductor switch and the field winding are arranged close to each other,
    When it is determined that the high necessity execution condition is satisfied, the drive control unit executes the stopper position detection operation regardless of whether the flasher drive condition is satisfied or not, and the flasher on / off switching control unit While the stopper position detection operation is being executed by the drive control unit, on / off switching control of the flasher semiconductor switch is not executed,
    When it is determined that the confirmation execution condition and the flasher driving condition are simultaneously satisfied, the flasher on / off switching control unit controls on / off of the flasher semiconductor switch, and the driving control unit The stopper system does not execute the stopper position detection while the on / off control of the flasher semiconductor switch is controlled.
  2. A pointer that indicates the vehicle state value according to the rotation position by rotating along a display surface of a scale plate that displays the vehicle state value;
    A step motor that rotationally drives the pointer by applying a drive signal alternating according to the electrical angle to the field winding;
    A stopper mechanism that stops the pointer that rotates in the zero return direction from a zero position that indicates a zero value of the vehicle state value to a stopper position that is within a predetermined range in the zero return direction;
    Based on the establishment of a predetermined stopper position detection operation execution condition, an induced voltage generated in the field winding is detected while controlling the drive signal so that the pointer rotates in the return zero direction. Stopper position detection operation executing means for executing a stopper position detection operation for detecting that the pointer has stopped at the stopper position using the detected induced voltage, and a stopper position detected by executing the stopper position detection operation A drive control unit comprising: zero point setting means for setting an electrical angle corresponding to the zero point as a zero point; and application means for applying the drive signal based on the zero point set by the zero point setting means to the field winding; And a vehicle indicating instrument having
    A flasher semiconductor switch,
    A flasher that blinks when on / off of the flasher semiconductor switch is controlled to be switched;
    It is determined whether or not a predetermined flasher driving condition based on a manual operation by a user is satisfied, and when it is determined that the flasher driving condition is satisfied, the flasher is operated in a manner corresponding to the flasher driving condition determined to be satisfied. A flasher on / off switching control unit for controlling on / off of the flasher semiconductor switch to blink
    Buzzer semiconductor switch,
    A buzzer that blows by turning on and off the buzzer semiconductor switch,
    A buzzer on / off switching control unit for switching on / off of the buzzer semiconductor switch in conjunction with on / off of the flasher semiconductor switch, and a meter system comprising a flasher function unit,
    The drive control unit has a high necessity execution condition that is highly necessary to promptly execute the stopper position detection operation and a low necessity to promptly execute the stopper position detection operation as the stopper position detection operation execution condition. With confirmatory execution conditions,
    At least one of the flasher semiconductor switch and the buzzer semiconductor switch and the field winding are arranged in close proximity,
    When it is determined that the high necessity execution condition is satisfied, the drive control unit executes the stopper position detection operation regardless of whether the flasher drive condition is satisfied or not, and the flasher on / off switching control unit and The buzzer on / off switching control unit is a semiconductor arranged in a state of being close to the field winding among the flasher semiconductor switch and the buzzer semiconductor switch while the stopper position detection operation is being executed by the drive control unit. While switching on / off of the switch is not controlled
    When it is determined that the flasher driving condition and the confirmation execution condition are simultaneously satisfied, the flasher on / off switching control unit and the buzzer on / off switching control unit turn on / off the flasher semiconductor switch and the buzzer semiconductor switch. The drive control unit is configured to switch the stopper position while on / off switching of the semiconductor switch disposed in the state close to the field winding is performed among the flasher semiconductor switch and the buzzer semiconductor switch. A meter system characterized by not performing a detection operation.
  3. The meter system according to claim 1 or 2,
    The meter system according to claim 1, wherein the high necessity execution condition is that the drive control unit is activated in a state where a supply voltage to the drive control unit is lower than a predetermined threshold value.
  4. In the meter system according to any one of claims 1 to 3,
    The meter system according to claim 1, wherein the confirmation execution condition is that the drive control unit is activated in a state where a supply voltage to the drive control unit is equal to or higher than a predetermined threshold.
JP2009251190A 2009-10-30 2009-10-30 Meter system Expired - Fee Related JP4858595B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2009251190A JP4858595B2 (en) 2009-10-30 2009-10-30 Meter system

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
JP2009251190A JP4858595B2 (en) 2009-10-30 2009-10-30 Meter system
DE102010038241.8A DE102010038241B9 (en) 2009-10-30 2010-10-18 Display instrument system with a display device for a vehicle
US12/925,698 US8400099B2 (en) 2009-10-30 2010-10-27 Meter system with indicator for vehicle

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JP4858595B2 true JP4858595B2 (en) 2012-01-18

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Publication number Priority date Publication date Assignee Title
JP2000203310A (en) * 1999-01-18 2000-07-25 Nippon Seiki Co Ltd Vehicular instrument device with built-in turn-signal relay circuit
JP3770095B2 (en) * 2001-03-05 2006-04-26 株式会社デンソー Step motor electric angle setting device and vehicle indicating instrument
JP3674522B2 (en) * 2001-03-13 2005-07-20 株式会社デンソー Indicators for vehicles
JP2003072424A (en) * 2001-09-05 2003-03-12 Nippon Seiki Co Ltd Instrumentation for vehicle
JP4725487B2 (en) * 2006-10-24 2011-07-13 パナソニック株式会社 Measuring meter device

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