WO2011039973A1 - 慣性センサ - Google Patents
慣性センサ Download PDFInfo
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- WO2011039973A1 WO2011039973A1 PCT/JP2010/005729 JP2010005729W WO2011039973A1 WO 2011039973 A1 WO2011039973 A1 WO 2011039973A1 JP 2010005729 W JP2010005729 W JP 2010005729W WO 2011039973 A1 WO2011039973 A1 WO 2011039973A1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01C—MEASURING DISTANCES, LEVELS OR BEARINGS; SURVEYING; NAVIGATION; GYROSCOPIC INSTRUMENTS; PHOTOGRAMMETRY OR VIDEOGRAMMETRY
- G01C19/00—Gyroscopes; Turn-sensitive devices using vibrating masses; Turn-sensitive devices without moving masses; Measuring angular rate using gyroscopic effects
- G01C19/56—Turn-sensitive devices using vibrating masses, e.g. vibratory angular rate sensors based on Coriolis forces
- G01C19/5776—Signal processing not specific to any of the devices covered by groups G01C19/5607 - G01C19/5719
Definitions
- the present invention relates to an inertial sensor used in various electronic devices such as vehicle control applications and car navigation.
- FIG. 14 is a block diagram of a conventional inertial sensor.
- the conventional inertial sensor 130 includes a vibrator 131, a drive unit 132, and a detection unit 133.
- the vibrator 131 is formed with a monitor electrode 131a, drive electrodes 131e and 131c, and detection electrodes 131b and 131d.
- the drive unit 132 amplifies the signal input from the monitor electrode 131a and supplies the amplified signal to the drive electrodes 131e and 131c.
- the detection unit 133 detects the amount of inertia applied to the vibrator 131 from the outside based on signals input from the detection electrodes 131b and 131d.
- the detection unit 133 includes an oscillator 135f, a switch 135e, a current-voltage converter 135c, a current-voltage converter 135d, a differential amplifier 135g, a detector 135h, and a failure diagnosis unit 135j.
- the switch 135e is connected to the oscillator 135f.
- the current-voltage converter 135c is connected to the detection electrode 131d and the switch 135e.
- the current-voltage converter 135d is connected to the detection electrode 131b.
- the differential amplifier 135g is connected to the current-voltage converter 135c and the current-voltage converter 135d.
- the detector 135h outputs the amount of inertia applied to the vibrator 131 based on the signal output from the differential amplifier 135g.
- the failure diagnosis unit 135j diagnoses the presence or absence of a failure based on the signal from the detector 135h.
- failure diagnosis when performing failure diagnosis, control is performed so that an oscillation signal from the oscillator 135f is output to the switch 135e. Then, the failure diagnosis unit 135j monitors the DC fluctuation value to diagnose whether the angular velocity sensor 130 has a failure.
- the conventional inertial sensor has a problem that a failure occurring in the drive unit or the vibrator cannot be diagnosed.
- the inertia amount cannot be detected while the failure is diagnosed.
- Patent Document 1 is known as a prior art document relating to the invention of this application.
- the inertial sensor of the present invention includes a vibrator, a drive unit that vibrates the vibrator, a detection unit that detects an inertia amount given to the vibrator from the outside, and a failure provided between the vibrator and the drive unit. It is set as the structure provided with the diagnostic part.
- the drive unit includes a reference potential supply unit that supplies a reference potential to the vibrator, and a drive signal supply unit that supplies a drive signal to the vibrator based on a monitor signal output from the vibrator.
- the failure diagnosis unit includes a diagnosis unit that diagnoses the presence or absence of a failure based on the current value flowing from the reference potential supply unit to the vibrator. With this configuration, it is possible to diagnose a failure that has occurred in the drive unit or the vibrator and to detect the amount of inertia while diagnosing the failure.
- FIG. 1 is a block diagram of an inertial sensor according to Embodiment 1 of the present invention.
- FIG. 2A is an explanatory diagram of drive vibration in the tuning fork vibrator included in the inertial sensor according to Embodiment 1 of the present invention.
- FIG. 2B is an explanatory diagram of the detected vibration in the tuning fork vibrator included in the inertial sensor according to Embodiment 1 of the present invention.
- FIG. 3A is an explanatory diagram of a multi-axis detection vibrator included in the inertial sensor according to Embodiment 1 of the present invention.
- FIG. 3B is an explanatory diagram of a multi-axis detection vibrator included in the inertial sensor according to Embodiment 1 of the present invention.
- FIG. 1 is a block diagram of an inertial sensor according to Embodiment 1 of the present invention.
- FIG. 2A is an explanatory diagram of drive vibration in the tuning fork vibrator included in the inertial sensor according to Embodiment
- FIG. 4 is a block diagram of a failure diagnosis unit, a reference potential supply unit, and a vibrator included in the inertial sensor according to Embodiment 1 of the present invention.
- FIG. 5 is a diagram illustrating a voltage waveform of the failure diagnosis unit included in the inertial sensor according to Embodiment 1 of the present invention.
- FIG. 6 is a block diagram of a diagnostic unit included in the inertial sensor according to Embodiment 1 of the present invention.
- FIG. 7 is a block diagram of a failure diagnosis unit including a current mirror circuit included in the inertial sensor according to Embodiment 1 of the present invention.
- FIG. 8 is a block diagram of the inertial sensor according to Embodiment 2 of the present invention.
- FIG. 9 is a diagram illustrating a voltage waveform of the failure diagnosis unit included in the inertial sensor according to Embodiment 2 of the present invention.
- FIG. 10 is a block diagram of the inertial sensor according to Embodiment 3 of the present invention.
- FIG. 11 is a block diagram of a failure diagnosis unit, a reference potential supply unit, and a vibrator included in the inertial sensor according to Embodiment 3 of the present invention.
- FIG. 12 is a block diagram of a diagnostic unit included in the inertial sensor according to Embodiment 3 of the present invention.
- FIG. 13A is a diagram illustrating a voltage waveform of a failure diagnosis unit included in the inertial sensor according to Embodiment 3 of the present invention.
- FIG. 13B is a diagram showing an output signal of the full-wave rectifier included in the inertial sensor according to Embodiment 3 of the present invention.
- FIG. 13C is a diagram showing an output signal of a low-pass filter included in the inertial sensor according to Embodiment 3 of the present invention.
- FIG. 14 is a block diagram of a conventional inertial sensor.
- FIG. 1 is a block diagram of inertial sensor 10 according to Embodiment 1 of the present invention.
- an inertial sensor 10 includes a vibrator 11, a drive unit 12 that vibrates the vibrator 11, a detection unit 13 that detects an inertia amount given to the vibrator 11 from the outside, a vibrator 11, and a drive unit. 12 is provided with a failure diagnosis unit 14 provided between
- the drive unit 12 includes a reference potential supply unit 12 a that supplies a reference potential to the vibrator 11, and a drive signal supply unit 12 e that supplies a drive signal to the vibrator 11 based on the monitor signal output from the vibrator 11. Have.
- the reference potential supply unit 12a generates a reference potential by dividing the power supply voltage and the ground using resistors 12b and 12c, and supplies the reference potential to the vibrator 11 using the reference potential supply amplifier 12d. .
- the drive signal supply unit 12e converts the current value of the monitor signal into a voltage value using the IV conversion amplifier 12f, and uses an AGC (Auto Gain Control) amplifier (not shown) to obtain a substantially constant amplitude value. Furthermore, unnecessary signals are suppressed using the filter 12h, and a drive signal is supplied from the output amplifier 12g to the vibrator 11.
- the monitor signal may be input in a positive and negative differential format. Similarly, the drive signal may be output in a positive and negative differential format.
- the vibrator 11 vibrates at a driving vibration frequency depending on the shape of the vibrator 11 and the like based on the reference potential input from the electrode 11a and the driving signal input from the electrode 11b.
- a monitor signal generated by the drive vibration is output from the electrode 11c.
- the vibrator 11 is formed so as to perform detection vibration by an inertia amount given from the outside.
- a detection signal generated by this detection vibration is output from the electrode 11d.
- the method for exciting the drive vibration based on the drive signal may be performed by any of a piezoelectric method, a capacitance method, and an electromagnetic drive method.
- the method for generating the monitor signal from the drive vibration and the method for generating the detection signal from the detection vibration may be performed by any of the piezoelectric method, the capacitance method, and the electromagnetic drive method.
- the detection unit 13 includes an IV conversion amplifier 13a, a detection unit 13b, and a low-pass filter 13c.
- the IV conversion amplifier 13a converts the current value of the detection signal into a voltage value.
- the detector 13b detects the signal output from the IV conversion amplifier 13a using the monitor signal.
- the low pass filter 13c smoothes the signal output from the detection unit 13b. With this configuration, the detection unit 13 outputs a voltage value corresponding to the amount of inertia given to the vibrator 11 from the outside to the output unit 10b.
- the failure diagnosis unit 14 measures the amount of current flowing from the reference potential supply unit 12a to the vibrator 11, and diagnoses the presence or absence of a failure of the drive unit 12 or the vibrator 11 based on the amount of current.
- the diagnosis result is output from the output unit 10a.
- FIG. 2A is an explanatory diagram of drive vibration in the tuning fork vibrator included in the inertial sensor according to Embodiment 1 of the present invention.
- FIG. 2B is an explanatory diagram of the detected vibration in the tuning fork vibrator included in the inertial sensor according to Embodiment 1 of the present invention.
- 2A and 2B show a tuning fork vibrator 20 which is an example of the vibrator 11. By using this tuning fork vibrator 20 as the vibrator 11 of FIG. 1, it is possible to detect an angular velocity given to the tuning fork vibrator 20 from the outside. A method for detecting the angular velocity using the tuning fork vibrator 20 will be described below.
- FIG. 2A shows the drive vibration 21 of the tuning fork vibrator 20
- FIG. 2B shows the detection vibration 22 of the tuning fork vibrator 20.
- the tuning fork vibrator 20 receives a drive signal from the drive unit 12 and generates a drive vibration 21 having a specific drive vibration frequency.
- the detection vibration 22 is generated in the direction perpendicular to the rotation axis of the driving vibration 21 and the angular velocity 23 by the Coriolis force.
- a detection signal output from the tuning fork vibrator 20 based on the detected vibration 22 has the same frequency as the drive vibration 21 and an amplitude depending on the angular velocity 23. Therefore, the detection unit 13 can detect the angular velocity 23 by detecting this detection signal using the monitor signal.
- 3A and 3B are explanatory diagrams of the multi-axis detection vibrator included in the inertial sensor according to Embodiment 1 of the present invention.
- 3A and 3B show a multi-axis detection vibrator 30 which is another example of the vibrator 11.
- the multi-axis detection vibrator 30 can detect angular velocities around the Y axis and the Z axis by applying drive vibration in the X axis direction.
- a method for detecting angular velocities around the Y axis and the Z axis using the multi-axis detection vibrator 30 as the vibrator 11 of FIG. 1 will be described below.
- FIG. 3A is an explanatory diagram for detecting an angular velocity around the Z axis.
- the multi-axis detection vibrator 30 in the multi-axis detection vibrator 30, four weights 31 are respectively connected to a support 33 by arms 32. The operation when this multi-axis detection vibrator 30 is used as the vibrator 11 of FIG. 1 will be described below.
- a drive vibration 34 is generated at a specific drive vibration frequency in the X-axis direction.
- Coriolis force when an angular velocity 35 about the Z axis is input, Coriolis force generates a drive vibration 34 in the X axis direction and a detection vibration 36 in the Y axis direction perpendicular to the angular velocity 35 in the Z axis direction.
- the detection signal output from the multi-axis detection vibrator 30 based on the detection vibration 36 has the same frequency as the drive vibration 34 and an amplitude depending on the angular velocity 35. Therefore, the detection unit 13 can detect the angular velocity 35 by detecting the detection signal using the monitor signal.
- FIG. 3B is an explanatory diagram for detecting an angular velocity around the Y axis.
- Coriolis force when an angular velocity 37 about the Y axis is input, Coriolis force generates a drive vibration 34 in the X axis direction and a detection vibration 38 in the Z axis direction perpendicular to the angular velocity 37 in the Y axis direction.
- the detection signal output from the multi-axis detection vibrator 30 based on the detection vibration 38 has the same frequency as the drive vibration 34 and an amplitude depending on the angular velocity 37. Therefore, the detection unit 13 can detect the angular velocity 37 by detecting the detection signal using the monitor signal.
- FIG. 4 is a block diagram of failure diagnosis unit 14, reference potential supply unit 12a, and vibrator 11 included in the inertial sensor according to Embodiment 1 of the present invention.
- the failure diagnosis unit 14 measures the amount of current flowing from the reference potential supply unit 12a to the transducer 11 by measuring the voltage drop across the resistor 44a provided between the reference potential supply unit 12a and the transducer 11. is doing. In order to measure the voltage drop across the resistor 44a, the input side of the resistor 44a is connected to the inverting terminal via the resistor 44b.
- the output side of the resistor 44a is connected to the operational amplifier 44d (amplifier 44d) via a non-inverting terminal, and the resistor 44c is connected between the output terminal of the operational amplifier 44d and the inverting terminal.
- the failure diagnosis unit 14 includes a diagnosis unit 44e that performs failure diagnosis based on the voltage output from the operational amplifier 44d.
- the diagnosis unit 44e is configured to output a failure signal when the AC voltage output from the operational amplifier 44d is outside a predetermined voltage range.
- the diagnosis unit 44e can detect a failure mode in which a constant value offset is added to the amount of current flowing through the resistor 44a.
- a method for performing failure diagnosis of the drive unit 12 or the vibrator 11 using the failure diagnosis unit 14 will be described below.
- FIG. 5 is a diagram illustrating a voltage waveform of the failure diagnosis unit included in the inertial sensor according to Embodiment 1 of the present invention.
- FIG. 5 shows a voltage waveform in the diagnosis unit 44e.
- the horizontal axis shown in FIG. 5 indicates time, and the vertical axis indicates voltage.
- the voltage waveform 50 is a voltage waveform of a signal input to the diagnosis unit 44e. Since the drive unit 12 shapes the AC monitor signal generated from the drive vibration of the vibrator 11 and applies the AC drive signal to the vibrator 11, the current flowing through the resistor 44a becomes an alternating current. Therefore, the voltage waveform 50 of the signal input to the diagnosis unit 44e is an AC waveform as shown.
- a voltage waveform 50a prior to time t1 indicates a voltage waveform when the drive unit 12 or the vibrator 11 is operating normally.
- a voltage waveform 50b after the time t1 indicates a voltage waveform when the drive unit 12 or the vibrator 11 fails.
- FIG. 6 is a block diagram of a diagnostic unit included in the inertial sensor according to Embodiment 1 of the present invention.
- FIG. 6 shows a block diagram of the diagnosis unit 44e.
- the diagnosis unit 44e includes a maximum value measurement unit 61, a minimum value measurement unit 62, a comparison unit 63, a comparison unit 64, and a failure signal output unit 65.
- the maximum value measuring unit 61 holds an upper limit value of the amplitude of the input signal.
- the minimum value measuring unit 62 holds the lower limit value of the amplitude of the input signal.
- the comparison unit 63 outputs a Hi signal when the output value of the maximum value measurement unit 61 is larger than the upper limit threshold TH1.
- the comparison unit 64 outputs a Hi signal when the output value from the minimum value measurement unit 62 is smaller than the lower limit threshold TH2.
- the failure signal output unit 65 outputs a Hi signal as a signal indicating a failure when a Hi signal is output from any one of the comparison unit 63 or the comparison unit 64.
- Such a diagnosis unit 44e can detect a failure mode in which a certain amount of offset is added to the amount of current flowing through the resistor 44a.
- the failure diagnosis unit 14 can be used to diagnose a failure that has occurred in the drive unit 12 or the vibrator 11. In addition, while the failure diagnosis unit 14 performs the failure diagnosis, since the reference potential supply unit 12a supplies the reference potential to the vibrator 11, the inertial sensor 10 is given to the vibrator 11 from the outside. The amount of inertia can be detected.
- the amount of current flowing from the reference potential supply unit 12a to the vibrator 11 is measured by the voltage drop across the resistor 44a.
- the method of measuring the amount of current flowing from the reference potential supply unit 12a to the vibrator 11 is not limited to this configuration.
- FIG. 7 is a block diagram of a failure diagnosis unit including a current mirror circuit included in the inertial sensor according to Embodiment 1 of the present invention.
- FIG. 7 shows an operational amplifier 70 using a current mirror circuit, which is an example of the operational amplifier 44d.
- the operational amplifier 70 connects a current mirror transistor 71 and an output driver transistor 72 in parallel.
- the mirror ratio ratio of the amplification factor of the output driver transistor 72 and the amplification factor of the current mirror transistor 71
- the current flowing through the current mirror transistor 71 can be made 1/10 of the current flowing through the output driver transistor 72.
- the monitor current flowing through the current mirror transistor 71 flows through the monitor resistor 73, is converted into a voltage, and is output as a current monitor output from the output terminal 75 via the buffer amplifier 74.
- the output stage configuration of the operational amplifier 70 is a sink current control type configured by a constant current source and an N-type output driver transistor.
- the configuration is not limited to this output stage configuration, and a configuration using a discharge current control type configured by a P-type output driver transistor and a constant current source may be used.
- an output stage configuration such as a push-pull configuration using a P-type driver transistor and an N-type driver transistor in the output stage may be used.
- the discharge current and the sink current can be monitored using a current mirror circuit of an N-type driver transistor and a current mirror circuit of a P-type driver transistor.
- FIG. 8 is a block diagram of the inertial sensor according to Embodiment 2 of the present invention. The features of the second embodiment will be described focusing on the differences from the first embodiment.
- FIG. 8 shows an inertial sensor 80 which is an example of a configuration for measuring the amount of current flowing from the output amplifier 12g to the vibrator 11.
- a set of failure diagnosis units 81 is provided between a set of output amplifiers 12g and a set of electrodes 11b.
- a failure signal output unit 82 is provided that outputs a failure signal to the output unit 10a when any one of the pair of failure diagnosis units 81 outputs a failure signal.
- the failure diagnosis unit 81 can be realized with the same configuration as the failure diagnosis unit 14.
- the diagnosis unit can also be realized with the same configuration as the diagnosis unit 44e.
- FIG. 9 is a diagram illustrating a voltage waveform of the failure diagnosis unit included in the inertial sensor according to the second embodiment of the present invention.
- FIG. 9 shows a case where a failure mode in which the amplitude of the voltage increases is generated.
- the voltage waveform 90a indicates a voltage waveform immediately after the disconnection occurs.
- a voltage waveform 90b after the time t1 shows a voltage waveform when the amplitude of the voltage increases.
- Such a failure mode occurs, for example, when one of the set of output amplifiers 12g fails or when one of the wires between the set of output amplifiers 12g and the set of electrodes 11b is disconnected.
- the drive signal is supplied only from the output amplifier 12g that is not disconnected, the current amount of the drive signal supplied to the vibrator 11 and the current amount of the monitor signal are temporarily reduced.
- the AGC amplifier (not shown) in the drive signal supply unit 12e controls the current amount of the monitor signal to be a constant value, the current amount output from the output amplifier 12g that is not disconnected is large. It is controlled to become. As a result, a voltage waveform as shown in the voltage waveform 90b is obtained, and this failure mode can be detected by comparing with the upper threshold TH1 and the lower threshold TH2.
- FIG. 10 is a block diagram of the inertial sensor according to Embodiment 3 of the present invention.
- FIG. 11 is a block diagram of a failure diagnosis unit, a reference potential supply unit, and a vibrator included in the inertial sensor according to Embodiment 3 of the present invention.
- FIG. 12 is a block diagram of a diagnostic unit included in the inertial sensor according to Embodiment 3 of the present invention. The features of the third embodiment will be described focusing on the differences from the first embodiment.
- FIG. 11 shows the failure diagnosis unit 104, the reference potential supply unit 12a, and the vibrator 11.
- the failure diagnosis unit 104 has a configuration in which the diagnosis unit 44e in FIG. 4 is replaced with a diagnosis unit 104e.
- the diagnosis unit 104e is configured to output a failure signal when the amplitude value of the AC voltage output from the operational amplifier 44d becomes a predetermined value or less.
- the diagnosis unit 104e can detect a failure mode in which the amount of current flowing through the resistor 44a is almost zero.
- FIG. 12 shows a block diagram of the diagnosis unit 104e.
- the diagnosis unit 104e includes a full-wave rectification unit 121, a low-pass filter 122, and a comparison unit 123.
- the full wave rectification unit 121 performs full wave rectification on the input AC voltage.
- the low-pass filter 122 smoothes the output signal from the full wave rectifier 121.
- the comparison unit 123 outputs a Hi signal when the output value from the low-pass filter 122 is smaller than the threshold value TH3.
- Such a diagnostic unit 104e can detect a failure mode in which the amount of current flowing through the resistor 44a is substantially zero.
- a method for performing a failure diagnosis of the drive unit 12 or the vibrator 11 using the failure diagnosis unit 104 will be described below.
- FIG. 13A is a diagram illustrating a voltage waveform of a failure diagnosis unit included in the inertial sensor according to Embodiment 3 of the present invention.
- FIG. 13A shows a voltage waveform in the diagnosis unit 104e.
- the horizontal axis indicates time
- the vertical axis indicates voltage.
- the voltage waveform 110 is a voltage waveform of a signal input to the diagnosis unit 104e.
- a voltage waveform 110a before time t1 indicates a voltage waveform when the drive unit 12 or the vibrator 11 is operating normally.
- a voltage waveform 110b after time t1 indicates a voltage waveform when the drive unit 12 or the vibrator 11 fails.
- FIG. 13B is a diagram showing an output signal of the full-wave rectifier included in the inertial sensor according to Embodiment 3 of the present invention.
- FIG. 13B shows the output signal 111 of the full-wave rectification unit 121 included in the diagnosis unit 104e.
- the output signal 111 is a waveform in a normal state until time t1, and is a waveform in a failure state after time t1.
- FIG. 13C is a diagram showing an output signal of a low-pass filter included in the inertial sensor according to Embodiment 3 of the present invention.
- FIG. 13C shows the output signal 112 of the low-pass filter 122.
- the waveform is in a normal state, and after time t1, the waveform is in a failed state. Since the output signal 112 has a delay time due to the low-pass filter 122, the output signal 112 has a voltage value smaller than the threshold value TH3 at a time t2 when a predetermined time has elapsed from the time t1. Therefore, a failure diagnosis signal is output from the diagnosis unit 104e at time t2.
- a failure diagnosis unit 104 may be provided between the output amplifier 12 g and the vibrator 11. With this configuration, it is possible to detect a failure mode in which the amplitude of the current output from the output amplifier 12g to the vibrator 11 is a predetermined value or less.
- a failure diagnosis unit 104 may be provided on the output side of each output amplifier 12g, like the set of failure diagnosis units 81 shown in FIG. Thereby, it is possible to detect a failure mode in which the amplitude of the current output from one of the output amplifiers 12g is equal to or less than a predetermined value.
- the inertial sensor of the present invention diagnoses a failure that has occurred in the drive unit or the vibrator, and can detect the amount of inertia while diagnosing the failure. It is useful as a sensor used in equipment.
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Abstract
Description
図1は、本発明の実施の形態1における慣性センサ10のブロック図である。図1において、慣性センサ10は、振動子11と、振動子11を振動させる駆動部12と、振動子11に外部から与えられた慣性量を検知する検知部13と、振動子11と駆動部12との間に設けられた故障診断部14とを備えている。
図8は、本発明の実施の形態2における慣性センサのブロック図である。実施の形態2の特徴部分について、実施の形態1との相違点を中心に説明する。図8は、出力アンプ12gから振動子11へ流れる電流量を測定する構成の一例である慣性センサ80を示している。慣性センサ80において、1組の出力アンプ12gと1組の電極11bとの間に、1組の故障診断部81を設けている。また、1組の故障診断部81のいずれかが故障信号を出力した場合に出力部10aに故障信号を出力する故障信号出力部82を備えている。
図10は、本発明の実施の形態3における慣性センサのブロック図である。図11は、本発明の実施の形態3における慣性センサが有する故障診断部、基準電位供給部および振動子のブロック図である。図12は、本発明の実施の形態3における慣性センサが有する診断部のブロック図である。実施の形態3の特徴部分について、実施の形態1との相違点を中心に説明する。
10a,10b 出力部
11 振動子
11a,11b,11c,11d 電極
12 駆動部
12a 基準電位供給部
12b,12c 抵抗
12d 基準電位供給アンプ
12e 駆動信号供給部
12f IV変換アンプ
12g 出力アンプ
12h フィルタ
13 検知部
13a IV変換アンプ
13b 検波部
13c ローパスフィルタ
14,81,104 故障診断部
20 音叉型振動子
21,34 駆動振動
22,36,38 検出振動
23,35,37 角速度
30 多軸検出振動子
31 錘
32 アーム
33 支持体
44a,44b,44c 抵抗
44d,70 オペアンプ(増幅器)
44e,104e 診断部
50,50a,50b 電圧波形
90,90a,90b 電圧波形
110,110a,110b 電圧波形
61 最大値測定部
62 最小値測定部
63,64,123 比較部
65,82 故障信号出力部
71 カレントミラートランジスタ
72 出力ドライバトランジスタ
73 モニタ抵抗
74 バッファアンプ
75 出力端子
111 出力信号
112 出力信号
121 全波整流部
122 ローパスフィルタ
Claims (7)
- 振動子と、
前記振動子を振動させる駆動部と、
前記振動子に外部から与えられた慣性量を検知する検知部と、
前記振動子と前記駆動部との間に設けられた故障診断部とを、
備え、
前記駆動部は、前記振動子に基準電位を供給する基準電位供給部と、
前記振動子から出力されるモニタ信号に基づいて前記振動子に駆動信号を供給する駆動信号供給部とを有し、
前記故障診断部は、前記基準電位供給部から前記振動子に流れる電流値に基づいて故障の有無を診断する診断部とを備えた
慣性センサ。 - 前記故障診断部は、前記基準電位供給部と前記振動子との間に直列接続された抵抗と、
前記抵抗の両端の電圧降下量を増幅する増幅器と、
を有し、
前記診断部は、前記増幅器から出力された電圧値に基づいて故障の有無を診断する
請求項1に記載の慣性センサ。 - 振動子と、
前記振動子を振動させる駆動部と、
前記振動子に外部から与えられた慣性量を検知する検知部と、
前記振動子と前記駆動部との間に設けられた故障診断部とを、
備え、
前記駆動部は、前記振動子に基準電位を供給する基準電位供給部と、
前記振動子から出力されるモニタ信号に基づいて前記振動子に駆動信号を供給する駆動信号供給部とを有し、
前記故障診断部は、前記駆動信号供給部から前記振動子に流れる電流値に基づいて故障の有無を診断する診断部とを備えた
慣性センサ。 - 前記故障診断部は、前記駆動信号供給部と前記振動子との間に直列接続された抵抗と、
前記抵抗の両端の電圧降下量を増幅する増幅器と、
を有し、
前記診断部は、前記増幅器から出力された電圧値に基づいて故障の有無を診断する
請求項3に記載の慣性センサ。 - 前記診断部は、
前記電流値の最大値を出力する最大値測定部と、
前記電流値の最小値を出力する最小値測定部と、
前記最大値が予め定めた上限閾値よりも大きい場合に故障信号を出力する第1の比較部と、
前記最小値が予め定めた下限閾値よりも小さい場合に故障信号を出力する第2の比較部と、
前記第1の比較部又は前記第2の比較部のいずれかが故障信号を出力した場合に故障信号を出力する故障信号出力部とを
備えた請求項1または請求項3のいずれか1項に記載の慣性センサ。 - 前記故障信号出力部は、前記第1の比較部が故障信号を出力した場合と、前記第2の比較部が故障信号を出力した場合とで異なる故障信号を出力する
請求項5に記載の慣性センサ。 - 前記診断部は、
前記電圧値を全波整流する全波整流部と、
前記全波整流部からの出力信号を平滑化するローパスフィルタと、
前記ローパスフィルタからの出力信号が予め定めた閾値よりも小さい場合に故障信号を出力する比較部とを備えた
請求項1または請求項3のいずれか1項に記載の慣性センサ。
Priority Applications (5)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US15/146,999 USRE47211E1 (en) | 2009-10-01 | 2010-09-22 | Inertial sensor |
| US13/394,651 US8746034B2 (en) | 2009-10-01 | 2010-09-22 | Inertial sensor |
| CN201080041707.7A CN102510996B (zh) | 2009-10-01 | 2010-09-22 | 惯性传感器 |
| EP10820099.9A EP2455712B1 (en) | 2009-10-01 | 2010-09-22 | Inertial sensor |
| JP2011534059A JP5696293B2 (ja) | 2009-10-01 | 2010-09-22 | 慣性センサ |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2009229434 | 2009-10-01 | ||
| JP2009-229434 | 2009-10-01 |
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| Publication Number | Publication Date |
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| WO2011039973A1 true WO2011039973A1 (ja) | 2011-04-07 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/JP2010/005729 Ceased WO2011039973A1 (ja) | 2009-10-01 | 2010-09-22 | 慣性センサ |
Country Status (5)
| Country | Link |
|---|---|
| US (2) | US8746034B2 (ja) |
| EP (1) | EP2455712B1 (ja) |
| JP (1) | JP5696293B2 (ja) |
| CN (1) | CN102510996B (ja) |
| WO (1) | WO2011039973A1 (ja) |
Families Citing this family (1)
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| CN115085240A (zh) * | 2022-07-29 | 2022-09-20 | 南方电网科学研究院有限责任公司 | 一种电动汽车充电调节电压的控制方法及装置 |
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- 2010-09-22 WO PCT/JP2010/005729 patent/WO2011039973A1/ja not_active Ceased
- 2010-09-22 EP EP10820099.9A patent/EP2455712B1/en active Active
- 2010-09-22 JP JP2011534059A patent/JP5696293B2/ja active Active
- 2010-09-22 CN CN201080041707.7A patent/CN102510996B/zh active Active
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Also Published As
| Publication number | Publication date |
|---|---|
| JPWO2011039973A1 (ja) | 2013-02-21 |
| JP5696293B2 (ja) | 2015-04-08 |
| EP2455712A1 (en) | 2012-05-23 |
| EP2455712B1 (en) | 2017-03-08 |
| CN102510996A (zh) | 2012-06-20 |
| US8746034B2 (en) | 2014-06-10 |
| EP2455712A4 (en) | 2015-01-14 |
| US20120167658A1 (en) | 2012-07-05 |
| USRE47211E1 (en) | 2019-01-22 |
| CN102510996B (zh) | 2015-02-25 |
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