WO2015147062A1 - 圧力検出装置の断線検知回路 - Google Patents
圧力検出装置の断線検知回路 Download PDFInfo
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- WO2015147062A1 WO2015147062A1 PCT/JP2015/059138 JP2015059138W WO2015147062A1 WO 2015147062 A1 WO2015147062 A1 WO 2015147062A1 JP 2015059138 W JP2015059138 W JP 2015059138W WO 2015147062 A1 WO2015147062 A1 WO 2015147062A1
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- voltage
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- pressure
- pressure detection
- detection device
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L23/00—Devices or apparatus for measuring or indicating or recording rapid changes, such as oscillations, in the pressure of steam, gas, or liquid; Indicators for determining work or energy of steam, internal-combustion, or other fluid-pressure engines from the condition of the working fluid
- G01L23/22—Devices or apparatus for measuring or indicating or recording rapid changes, such as oscillations, in the pressure of steam, gas, or liquid; Indicators for determining work or energy of steam, internal-combustion, or other fluid-pressure engines from the condition of the working fluid for detecting or indicating knocks in internal-combustion engines; Units comprising pressure-sensitive members combined with ignitors for firing internal-combustion engines
- G01L23/221—Devices or apparatus for measuring or indicating or recording rapid changes, such as oscillations, in the pressure of steam, gas, or liquid; Indicators for determining work or energy of steam, internal-combustion, or other fluid-pressure engines from the condition of the working fluid for detecting or indicating knocks in internal-combustion engines; Units comprising pressure-sensitive members combined with ignitors for firing internal-combustion engines for detecting or indicating knocks in internal combustion engines
- G01L23/225—Devices or apparatus for measuring or indicating or recording rapid changes, such as oscillations, in the pressure of steam, gas, or liquid; Indicators for determining work or energy of steam, internal-combustion, or other fluid-pressure engines from the condition of the working fluid for detecting or indicating knocks in internal-combustion engines; Units comprising pressure-sensitive members combined with ignitors for firing internal-combustion engines for detecting or indicating knocks in internal combustion engines circuit arrangements therefor
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L19/00—Details of, or accessories for, apparatus for measuring steady or quasi-steady pressure of a fluent medium insofar as such details or accessories are not special to particular types of pressure gauges
- G01L19/08—Means for indicating or recording, e.g. for remote indication
- G01L19/083—Means for indicating or recording, e.g. for remote indication electrical
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L19/00—Details of, or accessories for, apparatus for measuring steady or quasi-steady pressure of a fluent medium insofar as such details or accessories are not special to particular types of pressure gauges
- G01L19/08—Means for indicating or recording, e.g. for remote indication
- G01L19/12—Alarms or signals
Definitions
- the present invention relates to a disconnection detection circuit of a pressure detection device suitable for use in detecting pressure such as engine combustion pressure.
- a pressure detecting device that is mounted on an engine mounted on an automobile and detects a pressure (combustion pressure) in a combustion chamber using a built-in piezoelectric element (sensor element) is known, and is generally as shown in FIG. It is attached to the engine by a simple structure.
- reference numeral 601 denotes an automobile engine
- 602 denotes a pressure detection unit
- 603 denotes a wiring cable
- 604 denotes a control board.
- the pressure detection unit 602 is connected to the control board 604 via a wiring cable 603 including a power line, a GND line, and a signal line for transmitting a detection signal.
- the control board 604 has a function of controlling the engine 601 based on a detection signal from the pressure detection unit 602.
- the pressure detection unit 602 normally uses a piezoelectric crystal as a sensor element for detecting pressure, and a charge signal corresponding to the amount of change in pressure obtained from this piezoelectric crystal is given to the signal processing circuit, By being integrated, it is converted into a voltage (detection signal) similar to pressure.
- FIG. 7 shows an outline of the signal processing device disclosed in the literature 1.
- one terminal of the sensor element 701 is connected to the inverting input terminal of the operational amplifier 703 via the capacitor 702, and the other terminal of the sensor element 701 is connected to the GND (ground) of the circuit.
- the non-inverting input terminal of the operational amplifier 703 is connected to the reference power supply 704 and is supplied with the reference voltage Vr.
- a charge capacitor 705 and a high resistance discharge resistor are provided. 706 is connected by a parallel circuit.
- the signal output from the operational amplifier 703 passes through the operational amplifier 707 and is output to the outside as the signal voltage Vout.
- 8A illustrates an outline of the waveform of the charge amount (charge signal) Qi obtained from the sensor element 701
- FIG. 8B illustrates an example of the signal voltage Vout obtained from the operational amplifier 707.
- the voltage waveform shown in FIG. 8B is a waveform obtained by integrating the charge amount Qi shown in FIG. Note that the base voltage Vo of the signal voltage Vout (the signal voltage when the charge amount Qi is 0) is biased by the reference power supply 704, but is matched with the reference voltage Vr due to a so-called waveform sinking phenomenon by the charge capacitor 705. However, the voltage is lower than that.
- control board 604 it is difficult to incorporate the control board 604 described above into the pressure detection unit 602 from the viewpoint of ensuring the size and reliability.
- the control board 604 is disposed in another place in the engine room and is connected to the wiring cable 603. Connected. For this reason, the wiring cable 603 is routed through the engine room, but the engine room is often exposed to severe environments such as temperature, humidity, and wind pressure, and external stress acts. Therefore, when exposed to such an environment for a long time, the wiring cable 603 may be broken.
- a disconnection detection means for detecting this type of disconnection reliably and promptly is required.
- a disconnection detection circuit 130 as shown in FIG. 9 is provided.
- reference numeral 602 denotes the pressure detection unit shown in FIG. 6, 604 denotes the control board shown in FIG. 6, and 603 denotes the wiring cable shown in FIG.
- Reference numeral 101 denotes a signal processing device (signal processing circuit) portion including the sensor element shown in FIG.
- Reference numeral 102 denotes an output amplifier provided in the pressure detection unit 602, and 110 denotes an input amplifier provided in the control board 604.
- a pull-up resistor 103 that pulls up the output of the output amplifier 102 and a pull-down resistor 109 that pulls down the input to the input amplifier 110 are provided.
- Reference numerals 106 and 108 denote wiring cable sockets, respectively.
- the abnormality detection circuit 130 can detect when one of the power supply line 112, the GND line 111, and the signal line 113 included in the wiring cable 603 is disconnected. That is, when the signal line 113 is disconnected, the input of the control board 604 is fixed to the GND voltage level by the pull-down resistor 109. Further, when the power supply line 112 is disconnected, the power is not supplied to the pressure detection unit 602 side, so that the output of the output amplifier 102 becomes the GND voltage level or high impedance, and the input of the control board 604 is connected to the GND by the pull-down resistor 109. Is fixed at the voltage level. Further, when the GND line 111 is disconnected, the output of the output amplifier 102 is at the power supply voltage level or high impedance.
- the input of the control board 604 is fixed at the power supply voltage level.
- the input of the control board 604 is fixed to a voltage obtained by dividing the power supply voltage Vdd by the pull-up resistor 103 and the pull-down resistor 109.
- the resistance value of the pull-up resistor 103 is set to be very small compared to the resistance value of the pull-down resistor 109, the output voltage serving as the detection signal becomes a fixed voltage near the power supply voltage Vdd.
- the input signal of the control board 604 is fixed to the GND voltage level or the power supply voltage level (including the neighborhood level). Therefore, on the control board 604 side, these disconnections can be detected based on this. It should be noted that the same function can be achieved even if the output on the pressure detection unit 602 side is a pull-down and the input on the control board 604 side is a pull-up.
- the conventional disconnection detection device (disconnection detection circuit) of the pressure detection device described above has the following problems.
- the disconnection of the wiring cable 603 may cause an erroneous determination (false detection) because the control board 604 makes the determination based on the input signal on the control board 604 being fixed to the GND voltage level or the power supply voltage level. There is. In other words, even if it is a signal voltage related to pressure detection, the magnitude of the signal voltage varies depending on the situation and may reach the GND voltage level or the power supply voltage level instantaneously. Determining whether or not there is a disconnection is likely to cause misjudgment (false detection) and has a problem of poor reliability.
- this problem can be avoided by making a combination of the voltage level and its elapsed time. That is, an erroneous determination (false detection) can be avoided by adding to the determination condition that the GND voltage level or the power supply voltage level continues for a set time or longer.
- the processing circuit becomes complicated, the cost increase cannot be ignored, and it is necessary to wait for a set time, so that a quick determination cannot be made. Note that if the set time is set short, a certain degree of speed can be secured, but on the other hand, the effectiveness is reduced from the viewpoint of avoiding erroneous determination (false detection).
- An object of the present invention is to provide a disconnection detection circuit of a pressure detection device that solves the problems existing in the background art.
- the disconnection detection circuit 1 of the pressure detection device includes at least a pressure detection unit 11 including a pressure detection element 101 that outputs a charge signal corresponding to the pressure by receiving the pressure.
- the disconnection detection circuit of the pressure detection device for detecting the disconnection of the wiring cable 12 in the pressure detection device 10 including the wiring cable 12 that transmits the detection signal Dd output from the pressure detection unit 11 to the external circuit (13). Is provided with a pull-up resistor 103 to which the detection signal Dd is applied and the signal line 113c connected to the wiring cable 12 is connected to the power supply (power supply voltage) Vdd or the signal line 113c is connected to GND.
- a voltage clipping circuit 105 (having a high voltage clipping circuit 105 au that clips to the specified voltage Vdm and a low voltage clipping circuit 105 ad that is connected between the signal lines 113 c and GND and clips the voltage of the signal line 113 c to the minimum specified voltage Vds ( 105a ).
- the high voltage clip circuits 105 au can be provided with high-voltage-side resistance voltage dividing circuits 30 u connected between the power supply Vdd and the GND for setting the maximum specified voltage Vdm.
- the high voltage clipping circuit 105bu can use a transistor pair composed of a pnp transistor 402 and an npn transistor 401 to which a divided voltage obtained from the high-voltage-side resistance voltage dividing circuit 40u is applied. It is desirable to use a complementary transistor. Note that a diode 301 to which a divided voltage obtained from the high-voltage-side resistance voltage dividing circuit 30u is applied can be used for the high voltage clipping circuit 105au.
- the low voltage clip circuits 105ad... Can be provided with low voltage side resistance voltage dividing circuits 40d... Connected between the power supply Vdd and the GND for setting the minimum specified voltage Vds.
- a diode 302 to which a divided voltage obtained from the low-voltage-side resistance voltage dividing circuit 30d can be used for the low voltage clipping circuit 105ad.
- the voltage clip circuit 105 is preferably provided with an output resistor 104 connected in series to the signal line 113c on the input side of the high voltage clip circuit 105au... And the low voltage clip circuit 105ad.
- the control circuit 13 that outputs a control signal based on the detection signal Dd can be applied to the external circuit, and the wiring cable 12 includes a signal line 113 connected to the signal line 113c, a power supply line 112 connected to the power supply Vdd, and GND.
- a GND line 111 can be included.
- the voltage clip circuit 105 (105a %) having the high voltage clip circuit 105au ... and the low voltage clip circuit 105ad ... is provided, if the detection signal Dd becomes equal to or lower than the minimum specified voltage Vds, the voltage from the power source Vdd The voltage level of the signal line 113c can be clipped to the minimum specified voltage Vds, and if the detection signal Dd exceeds the maximum specified voltage Vdm, the voltage level of the signal line 113c can be clipped to the maximum specified voltage Vdm by dropping to the GND voltage.
- a desirable transistor pair can be easily configured by aligning the characteristics of each complementary transistor.
- the high voltage clipping circuit 105au can be easily constructed with a small number of parts. it can.
- a low voltage clipping circuit 105ad is provided with a low voltage side resistance voltage dividing circuit 30d connected between the power supply Vdd and the GND for setting the minimum specified voltage Vds according to a preferred embodiment, a simple low-cost circuit can be obtained. The minimum specified voltage Vds can be set easily.
- the low voltage clipping circuit 105ad can be easily constructed with a small number of parts. it can.
- control board 13 that outputs a control signal based on the detection signal Dd is applied to an external circuit according to a preferred embodiment, it is used as the optimum disconnection detection circuit 1 particularly in an engine control system mounted on an automobile. Can do.
- the wiring cable 12 includes the signal line 113 connected to the signal line 113c, the power supply line 112 connected to the power supply Vdd, and the GND line 111 connected to GND according to a preferred embodiment, each of these lines 113 and 112 is included. And the disconnection with respect to 111 can be detected reliably and rapidly.
- the basic block diagram of a pressure detection apparatus provided with the disconnection detection circuit which concerns on suitable embodiment of this invention, Circuit diagram of a voltage clip circuit provided in the disconnection detection circuit, Signal waveform diagram for explaining the operation of the disconnection detection circuit, A circuit diagram of a voltage clip circuit according to a modification example provided for the disconnection detection circuit, A circuit diagram of a voltage clip circuit according to another modification provided in the disconnection detection circuit, Schematic diagram of an engine equipped with a pressure detection device for explaining the background art, A circuit diagram of a pressure detection unit provided in the pressure detection device, Signal waveform diagram for explaining the operation of the pressure detection device, Overall circuit diagram of the pressure detection device,
- the pressure detection device 10 includes a pressure detection unit 11, a control board 13, and a wiring cable 12 that connects the pressure detection unit 11 and the control board 13.
- the pressure detection unit 11 includes a pressure detection unit 101 and an output amplifier 102, and also includes a pull-up resistor 103 and a voltage clip circuit 105 that constitute the disconnection detection circuit 1.
- the wiring cable 12 includes a power line 112, a GND line 111, and a signal line 113 for transmitting an output signal.
- Reference numerals 106 and 108 denote sockets for wiring cables.
- the control board 13 includes an input amplifier 110 and a pull-down resistor 109.
- the pressure detection unit 101 is connected to the input side of the output amplifier 102.
- the output side of the output amplifier 102 is connected to the input side of the voltage clip circuit 105 and also connected to the power supply Vdd via the pull-up resistor 103.
- the pull-up resistor 103 is illustrated as being connected to the front stage of the voltage clip circuit 105, but may be connected to the rear stage of the voltage clip circuit 105, that is, the front stage of the wiring cable socket 106.
- the output side of the voltage clip circuit 105 is connected to the control board 13 side via the signal line 113 in the wiring cable 12, and the power line and the GND line on the pressure detection unit 11 side are connected to the power line in the wiring cable 12.
- the control board 13 is an external circuit. If such a control board 13 is applied as an external circuit, a control signal based on the detection signal Dd can be output. It can be constructed as an optimum disconnection detection circuit 1 in the control system.
- the voltage clip circuit 105 clips the voltage level to the minimum specified voltage Vds by the voltage from the power supply Vdd when the input detection signal Dd is equal to or lower than the minimum specified voltage Vds, and receives the input detection signal Dd. Is equal to or higher than the maximum specified voltage Vdm, the voltage level is clipped to the maximum specified voltage Vdm by dropping the voltage to the GND voltage.
- the voltage clip circuit 105 includes an output resistor 104 connected in series to the signal line 113c. The output resistor 104 has a function of reducing the amount of current required when the voltage clip circuit 105 adjusts the output voltage.
- the disconnection detection circuit 1 includes the voltage clip circuit 105a (105) shown in FIG. 2, and particularly shows the simplest configuration example using a diode.
- Reference numeral 113c denotes a signal line whose output side is connected to the signal line 113 described above and whose input side is connected to the output side of the output amplifier 102 via the output resistor 104 described above.
- the voltage clip circuit 105a includes a high voltage clip circuit 105au and a low voltage clip circuit 105ad.
- the high-voltage clip circuit 105au includes a high-voltage side resistance voltage dividing circuit 30u configured by a series circuit of a resistor R31 and a resistor R32 connected between a power supply (power supply voltage) Vdd and GND. Providing such a high voltage resistance dividing circuit 30u makes it possible to easily set the maximum specified voltage Vdm with a simple low-cost circuit.
- a connection point between the resistor R31 and the resistor R32 and the signal line 113c are connected by a diode 301.
- the diode 301 connects the anode side to the signal line 113c.
- the voltage value obtained by adding the forward voltage drop of the diode 301 to the divided voltage of the resistors R31 and R32 is set as the maximum specified voltage Vdm, and the magnitude of the detection signal Dd applied to the signal line 113c is If the maximum specified voltage Vdm is exceeded, the voltage of the signal line 113c is clipped to the maximum specified voltage Vdm.
- the high voltage clipping circuit 105au can be easily constructed with a small number of parts.
- the low voltage clip circuit 105ad includes a low voltage side resistance voltage dividing circuit 30d configured by a series circuit of resistors R33 and R34 connected between the power supply Vdd and GND. If such a low-voltage resistance dividing circuit 30d is provided, the minimum specified voltage Vds can be easily set with a simple low-cost circuit.
- a connection point between the resistor R33 and the resistor R34 and the signal line 113c are connected by a diode 302. The diode 302 connects the cathode side to the signal line 113c.
- a voltage value obtained by subtracting the forward voltage drop of the diode 302 from the divided voltage of the resistors R33 and R34 is set as the minimum specified voltage Vds, and the magnitude of the detection signal Dd applied to the signal line 113c is When the voltage falls below the minimum specified voltage Vds, the voltage of the signal line 113c is clipped to the minimum specified voltage Vds.
- the diode 302 to which the divided voltage obtained from the low-voltage-side resistance voltage dividing circuit 30d is used for the low voltage clipping circuit 105ad
- the low voltage clipping circuit 105ad can be easily constructed with a small number of parts.
- the output resistor 104 connected in series to the signal line 113c is connected to the input side of the high voltage clip circuit 105au and the low voltage clip circuit 105ad.
- the resistance value of the output resistor 104 is the output impedance of the pressure detection unit 11, and therefore it is not appropriate to make it too large, and it can be set in consideration of the requirement on the control board 13 side and the allowable value of the current amount. desirable.
- the overall operation of the pressure detection device 10 is the same as the operation shown in FIGS. 6 to 9 described above, and a detailed description of the operation is omitted.
- FIG. 3A shows a waveform when the detection signal Dd output from the output amplifier 102 exceeds the maximum specified voltage Vdm
- FIG. 3B shows that the detection signal Dd due to the waveform sinking phenomenon is the lowest.
- the waveform when it becomes below the regulation voltage Vds is shown.
- the horizontal axis represents time
- the vertical axis represents the detection signal Dd [V].
- the signal portion Ddx exceeding the maximum specified voltage Vdm is clipped to the maximum specified voltage Vdm, and the detection signal Dd output from the pressure detector 11 becomes a signal portion indicated by a solid line.
- the signal portion Ddy that is equal to or lower than the minimum specified voltage Vds is clipped to the minimum specified voltage Vds, and the detection signal Dd output from the pressure detection unit 11 is a signal portion indicated by a solid line.
- the voltage waveform of the detection signal Dd output from the pressure detection device 10 is always controlled to be between the minimum specified voltage Vds and the maximum specified voltage Vdm. That is, the detection signal Dd output from the output amplifier 102 is pulled up to the power supply line 112 by the pull-up resistor 103, and the signal input to the control board 13 is pulled down to the GND line 111 by the pull-down resistor 109. Is done. As a result, when any one of the power supply line 112, the GND line 111, and the signal line 113 is disconnected, the detection signal Dd is fixed to the GND voltage level or the power supply voltage level voltage.
- the detection signal Dd output from the pressure detection device 10 is always between the minimum specified voltage Vds and the maximum specified voltage Vdm by the output clip circuit 105a.
- the voltage level is equal to or lower than the minimum specified voltage Vds or exceeds the maximum specified voltage Vdm, it can be immediately detected that a disconnection has occurred only by determination based on the voltage level.
- pull-up and pull-down the same effect can be obtained even when the pressure detection unit 11 side is pulled down and the control board 13 side is pulled up.
- the low voltage clipping circuit 105ad seems unnecessary, but when the detection signal Dd is large, the waveform Therefore, the detection signal Dd may be lower than the minimum specified voltage Vds.
- the detection signal Dd when heat is suddenly applied to the sensor element, a negative charge signal is output from the sensor element due to distortion of the housing that holds the sensor element, and the detection signal Dd instantaneously approaches the GND voltage level.
- the control board 13 side makes an erroneous determination even if the wiring cable 12 is disconnected. Therefore, it is important to provide the voltage clip circuit 105a on both the high voltage side and the low voltage side.
- the above-described voltage clip circuit 105a shown in FIG. 3 has an advantage that it can be easily implemented with a small number of parts.
- the voltage drop in the forward direction of the diodes 301 and 302 fluctuates due to a change in temperature, or a sudden voltage.
- a large clip current flows due to the change, there is a demerit that the clip voltage changes.
- FIG. 4 is a configuration example of a clip circuit 105b using a transistor that eliminates the disadvantages of the voltage clip circuit 105a shown in FIG.
- the voltage clip circuit 105b includes a high voltage clip circuit 105bu and a low voltage clip circuit 105bd.
- the high voltage clip circuit 105bu is connected between the signal line 303 and a connection point between the resistors R41 and R42 and a high voltage side resistor voltage dividing circuit 40u constituted by a series circuit of resistors R41 and R42 connected between the power supply Vd and GND.
- the transistor circuit including the npn transistor 401, the pnp transistor 402, and the resistor R43 is provided.
- the gate of the transistor 401 is connected to the connection point of the resistors R41 and R42, the collector is connected to the power supply Vd, the emitter is connected to GND through the resistor R43, and the gate of the transistor 402 is connected to the emitter of the transistor 401.
- the collector is connected to GND, and the emitter is connected to the signal line 403.
- a voltage obtained by adding the base-emitter voltage of the transistor 402 to the voltage obtained by subtracting the base-emitter voltage of the transistor 401 from the divided voltage of the resistors R41 and R42 becomes the maximum specified voltage Vdm. If complementary transistors having the same characteristics are used as the transistor 401 and the transistor 402, the maximum specified voltage Vdm becomes substantially equal to the divided voltage of the resistors R41 and R42.
- the low voltage clip circuit 105bd includes a low voltage side resistor voltage dividing circuit 40d configured by a series circuit of resistors R45 and R46 connected between the power supply Vd and GND, and a connection point between the resistors R45 and R46 and the signal line 303.
- a transistor circuit including an npn-type transistor 404, a pnp-type transistor 405, and a resistor R44, which are connected, is provided.
- the gate of the transistor 405 is connected to the connection point of the resistors R45 and R46
- the collector is connected to GND
- the emitter is connected to the power source Vd via the resistor R44
- the gate of the transistor 404 is connected to the emitter of the transistor 405.
- the collector is connected to the power source Vd, and the emitter is connected to the signal line 403. If complementary transistors having the same characteristics are used as the transistor 404 and the transistor 405, the minimum specified voltage Vds is substantially equal to the divided voltage of the resistors R45 and R46.
- FIG. 5 shows a configuration example of the clip circuit 105c using a transistor that solves the disadvantages of the voltage clip circuit 105a shown in FIG. 3 as in FIG. 4, but shows a configuration example with a smaller number of parts compared to FIG. .
- Reference numeral 503 denotes a signal line whose output side is connected to the signal line 113 described above and whose input side is connected to the output resistor 104 described above.
- the voltage clip circuit 105c includes a high voltage clip circuit 105cu and a low voltage clip circuit 105cd.
- the high voltage clipping circuit 105cu includes a transistor circuit including an npn type transistor 501, a pnp type transistor 502, a resistor R51, and a resistor R52.
- the gate and collector of the transistor 501 are connected to the power supply Vd through the resistor R51, and the emitter of the transistor 501 is connected to GND through the resistor R52.
- the gate of the transistor 502 is connected to the emitter of the transistor 501, the collector of the transistor 502 is connected to GND, and the emitter of the transistor 502 is connected to the signal line 503.
- the resistor R51 and the resistor R52 constitute a high voltage resistance dividing circuit 50u.
- the clipping voltage of the high voltage clipping circuit 105 cu is expressed by the following [Equation 1].
- Vd is a power supply voltage
- Vnpn is a forward voltage of the npn transistor 501
- Vpnp is a forward voltage of the pnp transistor 502
- R1 and R2 are resistance values of the resistors R51 and R52, respectively.
- the low voltage clip circuit 105cd includes a transistor circuit including an npn transistor 505, a pnp transistor 504, a resistor R53, and a resistor R54.
- the gate and collector of the transistor 504 are connected to GND via the resistor R54, and the emitter of the transistor 504 is connected to the power source Vd via the resistor R53.
- the gate of the transistor 505 is connected to the emitter of the transistor 504, the collector of the transistor 505 is connected to the power supply Vd, and the emitter of the transistor 505 is connected to the signal line 503.
- the resistor R53 and the resistor R54 constitute a low-voltage resistance dividing circuit 50d.
- the clipping voltage of the low voltage clipping circuit 105cd is expressed by the following [Equation 2].
- Vd is a power supply voltage
- Vnpn is a forward voltage of the npn transistor 505
- Vpnp is a forward voltage of the pnp transistor 504
- R3 and R4 are resistance values of the resistors R53 and R54, respectively.
- the output resistor 104 connected in series to the signal line 113c can be replaced by other means such as a circuit capable of reducing (adjusting) the amount of current.
- the control board 13 which outputs the control signal based on the detection signal Dd was applied was shown as the external circuit, other various signal processing circuits that can use the detection signal Dd can be applied.
- the wiring cable 12 preferably includes a signal line 113, a power supply line 112 connected to the power supply Vdd, and a GND line 111 connected to GND, but other lines may be included. When using a part of housing member which comprises a room, it is not necessarily required to include in the wiring cable 12.
- the high voltage clipping circuit 105bd are both provided with transistor pairs of pnp transistors 402 ... and npn transistors 401 ..., the high voltage clipping circuit 105bu ... and the low voltage clipping circuit 105b ... It is not excluded that only one of the circuits 105bd... Is configured to include a transistor pair of pnp transistors 402... And npn transistors 401. Similarly, although the case where both the high voltage clip circuit 105au and the low voltage clip circuit 105ad are configured using the diodes 301 is shown, only one of the high voltage clip circuit 105au and the low voltage clip circuit 105ad is connected to the diode 301. It does not exclude the case where it is configured using.
- the transistor pair is preferably configured using complementary transistors, but this does not exclude the use of other types of transistors.
- the disconnection detection circuit according to the present invention can be widely used for detection of disconnection of a pressure detection device having the same configuration as the pressure detection device for detecting the combustion pressure of the engine.
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Claims (13)
- 少なくとも、圧力を受けることにより当該圧力に対応した電荷信号を出力する圧力検出素子を有する圧力検出部と、この圧力検出部から出力する検出信号を外部回路に伝送する配線ケーブルとを備えてなる圧力検出装置における当該配線ケーブルの断線を検知する圧力検出装置の断線検知回路であって、前記検出信号が付与され、かつ前記配線ケーブルに接続する信号ラインを電源に接続するプルアップ抵抗又は当該信号ラインをGNDに接続するプルダウン抵抗を備えるとともに、前記信号ラインと電源間に接続して前記信号ラインの電圧を最大規定電圧にクリップする高電圧クリップ回路及び前記信号ラインとGND間に接続して前記信号ラインの電圧を最小規定電圧にクリップする低電圧クリップ回路とを有する電圧クリップ回路を備えることを特徴とする圧力検出装置の断線検知回路。
- 前記高電圧クリップ回路は、前記最大規定電圧を設定する前記電源とGND間に接続した高圧側抵抗分圧回路を備えることを特徴とする請求項1記載の圧力検出装置の断線検知回路。
- 前記高電圧クリップ回路は、前記高圧側抵抗分圧回路から得る分圧電圧が付与されるpnpトランジスタとnpnトランジスタによるトランジスタ対を用いることを特徴とする請求項2に記載の圧力検出装置の断線検知回路。
- 前記トランジスタ対は、コンプリメンタリ・トランジスタを用いて構成することを特徴とする請求項3記載の圧力検出装置の断線検知回路。
- 前記高電圧クリップ回路は、前記高圧側抵抗分圧回路から得る分圧電圧が付与されるダイオードを用いることを特徴とする請求項2記載の圧力検出装置の断線検知回路。
- 前記低電圧クリップ回路は、前記最小規定電圧を設定する前記電源とGND間に接続した低圧側抵抗分圧回路を備えることを特徴とする請求項1記載の圧力検出装置の断線検知回路。
- 前記低電圧クリップ回路は、前記低圧側抵抗分圧回路から得る分圧電圧が入力するpnpトランジスタとnpnトランジスタによるトランジスタ対を用いることを特徴とする請求項6に記載の圧力検出装置の断線検知回路。
- 前記トランジスタ対は、コンプリメンタリ・トランジスタを用いて構成することを特徴とする請求項7記載の圧力検出装置の断線検知回路。
- 前記低電圧クリップ回路は、前記低圧側抵抗分圧回路から得る分圧電圧が付与されるダイオードを用いることを特徴とする請求項6記載の圧力検出装置の断線検知回路。
- 前記電圧クリップ回路は、前記高電圧クリップ回路及び前記低電圧クリップ回路の入力側における前記信号ラインに直列接続した出力抵抗を備えることを特徴とする請求項1記載の圧力検出装置の断線検知回路。
- 前記外部回路は、前記検出信号に基づく制御信号を出力する制御基板であることを特徴とする請求項1記載の圧力検出装置の断線検知回路。
- 前記配線ケーブルは、前記信号ラインに接続する信号線,前記電源に接続する電源線及び前記GNDに接続するGND線を含むことを特徴とする請求項1記載の圧力検出装置の断線検知回路。
- 自動車に搭載するエンジンの燃焼圧を検出する圧力検出装置に適用してなることを特徴とする請求項1記載の圧力検出装置の断線検知回路。
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JP2016510429A JP6605450B2 (ja) | 2014-03-27 | 2015-03-25 | 圧力検出装置の断線検知回路 |
EP15768972.0A EP3124939B1 (en) | 2014-03-27 | 2015-03-25 | Disconnection sensing circuit for pressure detection device |
CN201580016381.5A CN106461489B (zh) | 2014-03-27 | 2015-03-25 | 压力检测装置的断线检测电路 |
US15/129,713 US10247634B2 (en) | 2014-03-27 | 2015-03-25 | Disconnection detection circuit of pressure detection device |
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JP2018160764A (ja) * | 2017-03-22 | 2018-10-11 | アイシン精機株式会社 | 信号伝送回路 |
JP2021018075A (ja) * | 2019-07-17 | 2021-02-15 | 株式会社デンソー | センサ装置 |
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US11585716B2 (en) * | 2020-03-03 | 2023-02-21 | J. Brasch Co., Llc | Pad presence sensing system |
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CN106461489A (zh) | 2017-02-22 |
US10247634B2 (en) | 2019-04-02 |
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JPWO2015147062A1 (ja) | 2017-04-13 |
CN106461489B (zh) | 2019-06-14 |
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EP3124939A1 (en) | 2017-02-01 |
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