JP2005267420A - Data transmitter - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce power consumption in a telemeter or the like for radio transmitting data. <P>SOLUTION: Power of the telemeter is supplied by electromagnetic induction by relative displacement between a permanent magnet provided on a fixed side and coils 26 and 58 installed on a movable side. A transmitter 24 aims at saving power by transmitting the data in a specified cycle by induced electromotive force in operation (while generating power), using power accumulated in an accumulation capacitor 38 in inactivation (while not generating power), and transmitting the data in a longer cycle than the specified one. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a data transmission device, and more particularly to a device such as a telemeter that wirelessly transmits data.

  2. Description of the Related Art Conventionally, a so-called telemeter is known that transmits physical quantity data detected by a sensor wirelessly and analyzes or records physical quantity data on the receiving side. Telemeters are widely applied to measuring various physical quantities in piston parts and tires of a vehicle engine because they can be measured in real time even if the sensor and the receiving device move relatively.

  As electric power for driving the telemeter, an electromagnetic coupling method using a coupling coil as shown in Patent Document 1 and an internal battery method as shown in Patent Document 2 are generally used.

Japanese Patent Laid-Open No. 7-334783 Japanese Patent No. 3068818

  However, in the electromagnetic coupling method, when the distance between the power transmission unit and the reception unit varies, the amount of power supplied varies, so that stable power supply becomes difficult. In addition, the internal battery system is not suitable for long-term use because it needs to be replaced when it is consumed, and it is cumbersome because all of the sensors are replaced at the time of replacement.

  Therefore, a method has been proposed in which a permanent magnet is provided on one of the two members that are relatively displaced, a coil is provided on the other, and electric power is supplied by electromagnetic induction. Is not supplied, and the physical quantity cannot be detected and the detected data cannot be transmitted.

  Of course, if the purpose is to detect the physical quantity of a member that is operating with a telemeter, it is considered that it is not necessary to detect the physical quantity during stoppage. However, if a physical quantity is detected only during operation in a member that repeats operation, non-operation, operation, non-operation and operation / non-operation, even if an abnormality occurs in the detected physical quantity, the abnormality occurred during operation. Or whether it occurred during non-operation. In addition, when detecting strain with a strain gauge, in order to accurately grasp the amount of actual change in the measurement target, the calibration reference value is detected during stoppage, and the amount of change from there is detected. It is necessary to detect a physical quantity and transmit detection data not only during operation but also during stoppage.

  The object of the present invention is to detect a physical quantity even during a stop, while adopting a configuration for supplying electric power by converting kinetic energy due to relative displacement between two members into electric energy, such as electromagnetic induction. Is to provide a data transmission device capable of transmitting detection data.

  The present invention provides conversion means for converting relative displacement between two members into electric energy, storage means for storing the electric energy, detection means for detecting an operating state and a stopped state of the two members, When the detection means detects an operating state, it operates with electric energy from the conversion means to wirelessly transmit data at a predetermined cycle, and when the detection means detects a stop state, the electric power stored in the storage means Transmitting means that operates by energy and transmits data in a cycle longer than the predetermined cycle.

  In the present invention, the apparatus further includes a storage unit that stores the data, and the transmission unit sequentially stores the data in the memory without transmitting the data when the stop state is detected, and changes from the stop state to the operation state. In the case of transition, the data stored in the storage means may be read and transmitted.

  In the present invention, the data acquisition unit may further include a data acquisition cycle and a transmission cycle that are longer than the predetermined cycle when the stop state is detected, or the data acquisition cycle is set to the predetermined cycle. It may be longer than the period.

  In one embodiment of the present invention, when the transmission unit detects the stop state, the transmission unit transmits data with a longer period as the remaining amount of electrical energy stored in the storage unit decreases.

  In another embodiment of the present invention, when the transmission unit detects the stop state, the transmission unit estimates a continuation pattern of the current stop state from the appearance pattern of the past stop state, and responds to the estimation result. Send data in cycles.

  As described above, in the present invention, in a stopped state where there is no relative displacement between the two members, the conversion means cannot generate electric energy, and it is necessary to operate using the electric energy stored in the storage means. Considering this, data is transmitted in a mode with less power consumption in the stopped state than in the operating state. That is, the data transmission cycle in the stop state is set longer than the cycle in the operation state, and power consumption associated with data transmission is reduced. In addition, when setting a period long, the aspect which does not transmit data substantially by setting a period long enough may be included. In this case, the data acquired in the stop state is stored in the storage means, and the data can be transmitted when the operation state is changed from the stop state. In addition to increasing the data transmission cycle in the stopped state, the amount of data to be transmitted may be reduced to suppress power consumption.

  The present invention can be applied to an apparatus or system such as a telemeter that wirelessly transmits data.

  According to the present invention, while adopting a configuration in which kinetic energy due to relative displacement between two members is converted into electric energy and electric power is supplied, detection of a physical quantity and transmission of detection data with low power consumption even during stoppage. Is possible.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings by taking an electromagnetic induction system using a permanent magnet and a coil as an example.

  First, it is a case where a telemeter is incorporated in a piston portion of a vehicle engine.

  FIG. 1 shows a state in which the telemeter is incorporated in the piston-crank system. The piston 10 is connected to the small end portion 16 of the connecting rod 14 via a piston pin 12. The connecting rod 14 is swingable about the piston pin 12, and the other end of the connecting rod 14, that is, the large end portion 18 is rotatably connected to the crankpin 20 of the crankshaft. Yes.

  The piston 10 is provided with a sensor 22 for measuring a predetermined physical quantity related to the piston. The physical quantity to be measured is temperature, a gap with the cylinder bore, distortion, deformation, etc. of the piston, and an appropriate sensor type and an appropriate installation position are selected according to the physical quantity to be detected. A telemeter transmitter 24 is fixed to the trunk of the connecting rod. The telemeter transmitter 24 processes the signal transmitted from the sensor 22 and wirelessly transmits it to a telemeter receiver (not shown) installed outside the internal combustion engine. The telemeter receiver performs processing such as measurement value calculation, recording, and analysis based on the received signal.

  The telemeter has a power supply device that supplies power to the telemeter transmitter 24 and the sensor. In the power supply device, the coil 26 is connected to a plurality of coils 26 arranged around the side opening of the connecting rod large end 18, the permanent magnet 30 arranged around the crankpin 20 of the crankshaft web 28, and the coil 26. Power supply circuit 32 is included. The coil 26 is arranged so that its axis is located substantially parallel to the axis of the crankpin 20, that is, in a direction penetrating the paper surface of FIG. 1. As shown in FIG. 2, the permanent magnet 30 is embedded in the crankshaft web 28 on both sides or one side of the connecting rod 14 so as to face the coil 26. In FIG. 2, there is shown a large gap between the side of the connecting rod 14 and the web 28, but this is to clearly show the permanent magnet 30 and the actual gap is very narrow. By disposing the coil 26 and the permanent magnet 30 so as to be substantially parallel to the axial direction of the crankpin 20, the permanent magnet 30 can be disposed not on the crankpin 20 but on the web portion. Thereby, it is not necessary to perform additional work, and the strength reduction of the crankpin can be prevented.

  In addition, a stop state detection coil 27 is disposed in a part of the periphery of the opening on the side surface of the connecting rod large end 18. Like the coil 26, the detection coil 27 is disposed so as to face the permanent magnet 30, and similarly to the coil 26, an induced electromotive force is generated due to relative displacement with the permanent magnet 30 during operation of the internal combustion engine, and the internal combustion engine. The induced electromotive force is zero during the stop.

  FIG. 3 shows the operating state of the internal combustion engine. The piston 10 reciprocates in the vertical direction, and the crankshaft 43 rotates. The crank pin 20 rotates around the crank journal. Thereby, the crankpin 20 and the connecting rod large end portion 18 relatively rotate. With this movement, the coil 26 and the permanent magnet 30 also move relative to each other, and the magnetic flux of the permanent magnet 30 linked to the coil 26 changes periodically. As a result, an induced electromotive force is generated in the coil 26, and this power is supplied to the power supply circuit 32. On the other hand, when attention is paid to the voltage of the detection coil 27, an induced electromotive force is generated during the operation of the internal combustion engine in the same manner as the coil 26, but the induced electromotive force is zero when the internal combustion engine is stopped. Therefore, by monitoring the potential of the detection coil 27, it is possible to detect whether the internal combustion engine is operating or stopped.

  Next, the case where a telemeter is assembled | attached to the wheel of a vehicle is demonstrated.

  FIG. 4 shows a state in which the telemeter is assembled to the vehicle wheel. The wheel 50 includes a wheel 52 and a tire 54 attached thereto. The wheel 50 is supported via a bearing by a support member 56 called a steering knuckle or the like for uprights and steering wheels. The support member 56 is supported with respect to the vehicle body by a suspension member such as a rod so that movement within a predetermined range is allowed. However, it does not rotate with the wheel 50, and in that sense is a part on the vehicle body side.

  A coil 58 is disposed in the circumferential direction near the vehicle body side edge of the rim 57 of the wheel 52, and a permanent magnet 60 is disposed at a predetermined position of the support member 56 so as to face the coil 58. The coil 58 is connected to a power supply circuit provided in the telemeter transmission side main body 62. Further, a part of the coil 58 functions as the stop state detection coil 59.

  The sensor detects a predetermined physical quantity related to the wheel, and transmits this wirelessly to a receiving unit provided on the vehicle body side. The physical quantity to be detected is, for example, tire air pressure. As the vehicle travels, the wheel 50 rotates, and an induced electromotive force is generated in the coil 58 due to the relative movement of the coil 58 and the permanent magnet 60. The sensor and the transmission unit are driven by this electric power. On the other hand, when attention is paid to the voltage of the detection coil 59, an induced electromotive force is generated during traveling similarly to the coil 58, but the induced electromotive force is zero during stoppage. Therefore, by monitoring the potential of the detection coil 59, it can be detected whether the vehicle is running or stopped.

  As described above, in both cases, the power is supplied by the induced electromotive force from the coils 26 and 58 during the operation, so that the physical quantity can be detected and the detected data can be transmitted. Suspends detection and transmission. As described above, if a physical quantity is detected only during operation, even if an abnormality has occurred in the detected physical quantity, it is possible to determine whether the abnormality has occurred during operation or during non-operation. Can not. In addition, when detecting strain with a strain gauge, it is necessary to detect a calibration reference value during stoppage.

  Therefore, in this embodiment, it is detected whether the detection coils 27 and 59 are operating or stopped, and if it is operating, a part of the induced electromotive force is accumulated in a capacitor or the like to prepare for the stopped state, and in the stopped state. When it is detected, the detection and transmission are performed using the stored power and in a predetermined power saving mode.

  FIG. 5 shows the power supply circuit of the present embodiment. The power supply circuit includes coils 26 and 58, diode bridges 34 and 42, a storage capacitor 38, a smoothing capacitor 44, and a regulator 39.

  The diode bridge 34 is connected to the coils 26 and 58 and rectifies the induced electromotive force from the coils 26 and 58 to generate a pulsating flow.

  The storage capacitor 38 is connected between both terminals of the diode bridge 34 and stores induced electromotive force.

  The regulator 39 adjusts the pulsating flow from the diode bridge 34 (removes the pulsating flow component) and supplies it to the transmitter 24 and the sensor.

  The transmitter 24 includes a wireless circuit board 24a having a wireless function and a signal processing board 24b having a signal processing circuit. Both the radio circuit board 24 a and the signal processing circuit board 24 b are operated by electric power from the regulator 39. The signal processing circuit board 24b inputs a signal from the sensor and supplies detection data from the sensor to the wireless circuit board 24a. The wireless circuit board 24a wirelessly transmits detection data superimposed on a predetermined carrier.

  On the other hand, the diode bridge 42 is connected to the detection coils 27 and 59 and rectifies the voltage signal from the detection coils 27 and 59.

  The smoothing capacitor 44 is connected between both terminals of the diode bridge 42 and smoothes the voltage signal.

  The resistors R1 and R2 connected in series are connected to the smoothing capacitor 44, and the voltage is divided and output to the signal processing circuit board 24b of the transmitter 24 as an operation (power generation) / stop (non-power generation) detection signal SI. When operating (power generation), SI is at a Hi level of a predetermined potential, and when stopped (non-power generation), SI is at a low level. The processor in the signal processing circuit board 24b determines whether the processor is operating or stopped based on the level of the SI signal. If the processor is operating, the physical quantity is detected by a sensor at a predetermined cycle and supplied to the wireless circuit board 24a. . In addition, when the operation is stopped, the operation is performed with the electric power from the storage capacitor 38, and the detection period of the sensor and the data transmission period from the wireless circuit board 24a are increased to reduce the power consumption.

  FIG. 6 shows a process flowchart of the transmitter 24. First, based on the level of the detection signal SI, the processor in the signal processing circuit board 24b determines whether the internal combustion engine is currently operating or running and generating power (S101). Since the induced electromotive force from the coils 26 and 58 can be used during power generation, the radio circuit board 24a and the signal processing circuit board 24b operate in the normal mode (S102). In this normal mode, the signal processing circuit board 24b detects data at a predetermined cycle and supplies the data to the radio circuit board 24a, and the radio circuit board 24a wirelessly transmits the data to the receiving side at a predetermined cycle. The predetermined period is set as appropriate, for example, 1 sec.

  On the other hand, when it is determined that the power generation is not in progress, the power consumption is required to be reduced because data detection and data transmission are performed using the stored power from the storage capacitor 38. Therefore, in this case, the radio circuit board 24a and the signal processing circuit board 24b operate in the power saving mode (S103). Specifically, data is detected with a period longer than that in the normal mode, and data is transmitted with a period longer than that in the normal mode. The period of data detection and transmission in the power saving mode is also set as appropriate. For example, if the normal mode is 1 sec, the period is several tens of sec in the power saving mode.

  FIG. 7 shows data detection and transmission timing during operation (power generation) and data detection and transmission timing during stoppage (non-power generation). Data is detected and transmitted at the timing indicated by pulse 100 during power generation, and data is detected and transmitted at the timing indicated by pulse 200 during non-power generation. By extending the period during non-power generation and reducing the number of data detection and transmission, data can be transmitted to the receiving side even when it is stopped (non-power generation), and the radio circuit board 24a and the signal processing circuit board The power consumption at 24b can be reduced.

  Therefore, on the receiving side, data transmitted from the transmitter 24 can be analyzed, and it can be determined that an abnormality has occurred during the stop, although there is no abnormality during the operation. On the receiving side, it is possible to determine whether the data is in operation or stopped by detecting the data transmission cycle. However, the transmitter 24 is in operation. Data or a flag indicating whether or not the sensor is stopped may be added to the sensor detection data and transmitted.

  In the above example, the cycle of the power saving mode is set to be uniformly longer than the cycle of the normal mode, but data detection and transmission are executed with the power stored in the storage capacitor 38 during stoppage (during non-power generation). Therefore, the period may be adaptively changed according to the remaining capacity of the storage capacitor 38 or the inter-terminal voltage more directly.

  FIG. 8 shows a processing flowchart in the power saving mode (S103 in FIG. 6) in this case.

  First, the processor in the signal processing circuit board 24b detects the inter-terminal voltage V of the storage capacitor 38 (S201). Then, it is determined whether or not the inter-terminal voltage V is equal to or higher than a predetermined threshold voltage V1 (S202). If the charge is still sufficiently stored in the storage capacitor 38 (YES in S202), the signal processing circuit board 24b and the wireless circuit board 24a detect and transmit data at the cycle t1, that is, the transmission rate r1 (S203). ). Here, the period t1 is a period longer than the period of the normal mode. When a certain period of time has elapsed since the stop and the inter-terminal voltage V becomes smaller than V1 (NO in S202), the signal processing circuit board 24b and the radio circuit board 24a detect data at the cycle t2, that is, the transmission rate r2. Transmit (S204). Here, t1 <t2 and r1> r2. By setting the data detection and transmission cycle to be longer as the voltage between the terminals of the storage capacitor 38 decreases, data can be transmitted even if the stop period extends for a long time.

  FIG. 9 shows data detection and transmission timing in this case. Even during stoppage (during non-power generation), when the inter-terminal voltage V is as high as V1 or higher, as shown by the pulse 200, transmission is performed in a longer cycle than in the normal mode, and the inter-terminal voltage V becomes lower than V1 Is transmitted at a longer period as indicated by pulse 300.

  In addition to the threshold voltage V1, voltages V2 and V3 (V1> V2> V3...) Are provided, and these are sequentially compared with the voltage between the terminals, and the data detection and transmission cycle is set to be gradually increased step by step. May be.

  In addition, in the case of an object such as an internal combustion engine or a wheel that is repeatedly operated and stopped, the past operation (power generation) and stop (non-power generation) patterns are learned, and the cycle of the power saving mode according to the pattern It is also preferable to set.

  FIG. 10 shows an example of a repeating pattern of operation and stop. FIG. 10A shows a case where the operation period is longer than the stop period, and FIG. 10B shows a case where the stop period is longer than the operation period. The processor in the signal processing circuit board 24b counts the stop period by the built-in timer and acquires the repeated pattern. In the case of FIG. 10A, the pattern of the stop period is t1, and in the case of FIG. 10B, the pattern of the stop period is determined to be t2 (t2> t1). By learning the pattern in this way, it is estimated that the stop period will continue in the same way as in the past pattern even when the operation state is changed to the stop state next, so the period is set according to the estimated stop period. Change.

  FIG. 11 shows a processing flowchart of the power saving mode in this case. First, the processor in the signal processing circuit board 24b reads a past pattern and estimates the duration of the current stop state. One method of estimation is to calculate an average of past stop periods. Estimate the duration of the current stop state with the addition average. Then, it is determined whether the estimated duration time T is equal to or longer than a predetermined threshold time t (S301). For example, in the case of FIG. 10, if the pattern is t1, it is determined that T = t1 <t, and if the pattern is t2, it is determined that T = t2> t. If estimated duration T is shorter than threshold time t (NO in S301), data transmission is performed at a transmission rate r1 lower than the transmission rate in the normal mode (S302). On the other hand, if estimated duration time T is equal to or longer than threshold time t (YES in S301), data transmission is performed at a transmission rate r2 lower than the normal mode transmission rate and transmission rate r1 (S303).

  In the above example, in the power saving mode, data is detected and transmitted in a longer cycle than in the normal mode, but only data is detected and stored in the memory in a longer cycle, and data is transmitted during that period. Alternatively, the power consumption in the wireless circuit board 24a may be reduced, and data may be read from the memory and transmitted during the next operation period.

  FIG. 12 shows the configuration of the power supply circuit in this case. The difference from FIG. 5 is that the transmitter 24 includes a memory 24c in addition to the radio circuit board 24a and the signal processing circuit board 24b. The memory 24c may be either volatile or non-volatile, but a non-volatile memory such as a flash memory is used to reliably prevent data loss.

  The signal processing circuit board 24b determines whether to operate or stop based on the level of the detection signal SI as in the case of FIG. If it is determined that the operation is stopped, the data detected by the sensor is not supplied to the wireless circuit board 24a but is sequentially stored in the memory 24c. The data detection cycle in this case may be the same cycle as that in the normal mode, but is preferably a cycle longer than that in the normal mode. When it is determined that the state has shifted from the stopped state to the operating state based on the level of the detection signal SI, the processor in the signal processing circuit board 24b reads the data group stored in the memory 24c and supplies the data group to the wireless circuit board 24a. Wirelessly transmit. Thereafter, the operation is performed in the normal mode, and data is detected and transmitted at a predetermined cycle.

  FIG. 13 shows an overall processing flowchart in this case. First, the processor in the signal processing circuit board 24b determines whether it is operating (power generation) (S401). If it is stopped (NO in S401), data is detected with a period longer than the period T in the normal mode (S402). Then, the detected data is stored in the memory 24c (S403). During the stop period, the processes of S402 and S403 are repeatedly executed, and a plurality of data is stored in the memory 24c.

  Next, when shifting from the stopped state to the operating state (YES in S401), the processor next determines whether or not untransmitted data exists in the memory 24c (S404). If there is untransmitted data, that is, data stored in the memory 24c in S403, the processor reads these data groups from the memory 24c, supplies them to the wireless circuit board 24a, and wirelessly transmits them (S405). After all data is read from the memory 24c, data detection and transmission are performed in the normal mode (S406).

  Thus, in the stop state (during non-power generation), the data detection cycle is lengthened and the data transmission is stopped, and the data detected during the stop period in the operation state (during power generation) is collectively transmitted, thereby reducing the power consumption. Can be further reduced.

  As mentioned above, although embodiment of this invention was described, this invention is not limited to this, A various deformation | transformation is possible.

  For example, in the above example, a coil and a permanent magnet are used as means for converting kinetic energy into electrical energy, but a piezoelectric element such as a bimorph may be used.

  Further, although a capacitor is used as means for storing electric power, a secondary battery may be used.

  Furthermore, although the telemeter has been described in the above example, the present invention is not limited to the telemeter, and is applied to any device or system that is provided on a moving member and transmits data to a fixed-side receiving unit wirelessly or by wire. It is possible.

  For example, in so-called rotating sushi, a sushi plate is placed on a moving belt conveyor, and a customer seated along the belt conveyor can pick up a desired sushi plate that has arrived before him. In this type of sushi, there is room for the sushi plate taken up by the customer, and it is necessary to replenish this space with another sushi plate in a short time.

  Therefore, an RFID tag is provided at a predetermined position of the sushi plate, and a system is provided in which wireless data from the RFID tag is received by a fixed receiving unit disposed in the vicinity of the belt conveyor. In a state where the sushi plate is placed on the belt conveyor, the sushi plate is conveyed by the belt conveyor, so the relative position between the sushi plate and the receiving unit changes. On the other hand, when the sushi plate is picked up by the customer, the sushi plate and the receiving unit are fixed relative to each other because the sushi plate is fixedly placed on the customer's table. Therefore, when the sushi plate is placed on the belt conveyor and moving, the data transmission period from the RFID tag is shortened to ensure communication with the receiving unit and the sushi material, elapsed time, etc. On the other hand, when the sushi plate is picked up from the belt conveyor and fixed, the data transmission period from the RFID tag is lengthened to transmit the data to reduce power consumption. On the receiving side, by receiving data from the RFID tag, it is possible to detect a sushi plate having a long elapsed time or a sushi plate picked up by a customer and notify the store clerk that a sushi plate should be added. .

  In the above-described embodiment, power consumption is suppressed by increasing the data transmission cycle in the stopped state, but the power consumption is suppressed by reducing the data amount itself to be transmitted without changing the transmission cycle. Also good. For example, when the detected data amount is transmitted as 8-bit data in the operating state, it is transmitted as 4-bit data in the stopped state, or only the upper 3 bits of the 8-bit data are transmitted. Although the accuracy of data itself is reduced by reducing the amount of data to be transmitted, there is no problem as long as the accuracy is such that the presence or absence of an abnormality in the stopped state can be detected. The amount of data to be reduced in the stop state can be set according to the target in which the data transmission device is incorporated. Of course, the data transmission cycle may be increased and the amount of transmission data may be reduced in the stopped state, and thereby a further effect of suppressing power consumption can be obtained.

It is a block diagram of the telemeter with which the piston of the internal combustion engine was mounted | worn. It is arrangement | positioning explanatory drawing of the coil and permanent magnet in FIG. It is explanatory drawing which shows a motion of a piston-crank system. It is a block diagram of the telemeter with which the wheel was mounted | worn. It is a block diagram of a power supply circuit. It is a whole process flowchart. It is data transmission timing explanatory drawing during electric power generation and non-electric power generation. It is a processing flowchart in a power saving mode. It is a data transmission timing chart in a power saving mode. It is explanatory drawing of a repeating pattern of electric power generation / non-electric power generation. It is another data transmission timing chart in a power saving mode. It is another block diagram of a power supply circuit. It is another whole process flowchart.

Explanation of symbols

  10 piston, 14 connecting rod, 18 large end, 20 crankpin, 22 sensor, 24 transmitter, 26 coil, 27 detection coil, 30 permanent magnet, 32 power supply circuit, 43 crankshaft, 50 wheels, 52 wheels, 58 coils 59, detection coil, 60 permanent magnet.

Claims (9)

Conversion means for converting relative displacement between the two members into electrical energy;
Storage means for storing the electrical energy;
Detecting means for detecting an operating state and a stopped state of the two members;
When the detecting means detects an operating state, it operates with electric energy from the converting means to transmit data in a predetermined cycle, and when the detecting means detects a stop state, the electric energy accumulated in the accumulating means Transmitting means for operating and transmitting data at a cycle longer than the predetermined cycle;
A data transmission device comprising: The apparatus of claim 1, further comprising:
Storage means for storing the data;
The transmission means sequentially stores the data in the storage means without transmitting the data when the stop state is detected, and is stored in the storage means when the operation state is shifted from the stop state. A data transmitting apparatus characterized by reading and transmitting data. The apparatus of claim 1.
Means for obtaining the data;
And a data transmission device characterized in that when the stop state is detected, the data acquisition cycle and transmission cycle are made longer than the predetermined cycle. The apparatus of claim 2.
Means for obtaining the data;
And a data transmission device characterized in that when the stop state is detected, the data acquisition cycle is made longer than the predetermined cycle. The apparatus of claim 1.
The data transmission apparatus according to claim 1, wherein when the stop state is detected, the transmission means transmits data in a longer cycle as the remaining amount of electric energy stored in the storage means decreases. The apparatus of claim 5.
The storage means is a capacitor;
The data transmission apparatus according to claim 1, wherein the transmission means transmits data at a longer cycle as the terminal voltage of the capacitor decreases. The apparatus of claim 1, further comprising:
Means for storing an appearance pattern of the stop state;
Have
When the stop state is detected, the transmission unit estimates a continuation pattern of the current stop state from a past stop state appearance pattern, and transmits data in a cycle according to the estimation result. Data transmission device. The apparatus of claim 7.
The appearance pattern of the stop state is a duration of the stop state,
The transmission means estimates the duration of the current stop state from the duration of the past stop state, and transmits data with a longer period as the duration obtained by the estimation is longer . Conversion means for converting relative displacement between the two members into electrical energy;
Storage means for storing the electrical energy;
Detecting means for detecting an operating state and a stopped state of the two members;
When the detecting means detects an operating state, it operates with electric energy from the converting means to transmit data, and when the detecting means detects a stop state, it operates with the electric energy stored in the accumulating means. Transmitting means for transmitting data with a data amount smaller than the transmission data amount in the operating state;
A data transmission device comprising:

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