CN212867664U - Dual-output engine oil pressure sensor adjusting circuit - Google Patents
Dual-output engine oil pressure sensor adjusting circuit Download PDFInfo
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- CN212867664U CN212867664U CN202021948481.6U CN202021948481U CN212867664U CN 212867664 U CN212867664 U CN 212867664U CN 202021948481 U CN202021948481 U CN 202021948481U CN 212867664 U CN212867664 U CN 212867664U
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Abstract
The utility model discloses a dual output machine oil pressure sensor adjustment circuit, include: the oil pressure sensor comprises an oil pressure sensor and a signal adjusting circuit, wherein the signal adjusting circuit comprises a signal amplifying circuit, a current-limiting filter circuit, a signal processing module, an optical coupling isolation circuit, an alarm driving circuit and a power supply circuit. The oil pressure sensor is used for detecting the oil pressure and outputting differential voltage; the signal amplification circuit performs differential amplification on the differential voltage and outputs an engine oil voltage signal; the current-limiting filter circuit shunts and filters the engine oil voltage signal and then outputs a smooth voltage signal; the signal processing module calculates real-time pressure and outputs a PWM signal and an alarm signal WK-CON; the optical coupling isolation circuit is used for electrically isolating the PWM signal and the alarm signal; the power supply circuit is used for supplying power to all circuits. The utility model has the advantages of high measurement accuracy and strong interference resistance.
Description
Technical Field
The utility model relates to a signal adjustment circuit technical field, in particular to dual output machine oil pressure sensor adjusting circuit.
Background
At present, the rapid development of the world economy and industry, automobiles become important vehicles for people to daily life and industrial transportation, at present, the power of the automobiles is mainly provided by an internal combustion engine, the internal combustion engine needs to be lubricated during the working process, and the used lubricant is called engine oil. Oil pressure sensors are used on automobiles and diesel vehicles to measure the oil pressure of an engine.
The electronic engine oil pressure sensor can be used by a subsequent control unit only by conditioning a pressure sensor signal into a standard signal, and because the working environment of an automobile is very severe, the current signal conditioning circuit has poor stability and weak anti-interference performance, and the accuracy of the measured engine oil pressure is low.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a dual output machine oil pressure sensor adjusting circuit, it has measurement accuracy height, advantage that the interference killing feature is strong.
The above technical purpose of the present invention can be achieved by the following technical solutions:
a dual output oil pressure sensor regulation circuit comprising: the oil pressure sensor and the signal adjusting circuit, the signal adjusting circuit comprises a signal amplifying circuit, a current-limiting filter circuit, a signal processing module, an optical coupling isolation circuit, an alarm driving circuit and a power circuit,
the oil pressure sensor is used for detecting the oil pressure and outputting differential voltage VOUT + and VOUT-;
the signal amplification circuit is connected with two output ends of the oil pressure sensor, and is used for differentially amplifying differential voltages VOUT + and VOUT-and outputting an engine oil voltage signal;
the current-limiting filter circuit is connected with the output end of the signal amplification circuit, and outputs a smooth voltage signal after shunting and filtering the engine oil voltage signal;
the signal processing module is connected with the output end of the current-limiting filter circuit, receives the smooth voltage signal, calculates to obtain real-time pressure and outputs a PWM signal and an alarm signal WK-CON;
the optical coupling isolation circuit comprises a first optical coupling isolation circuit and a second optical coupling isolation circuit, the input end of the first optical coupling isolation circuit is connected with one output end of the signal processing module, receives the PWM signal and outputs a power supply trigger signal Q1-B,
the input end of the second optical coupling isolation circuit is connected with the other output end of the signal processing module, receives an alarm signal WK-CON and outputs an alarm trigger signal Q4-B;
the alarm driving circuit comprises an indicator lamp D3, the input end of the alarm driving circuit is connected with the output end of the second optical coupling isolation circuit, and the indicator lamp D3 is driven to be switched on and off according to a received alarm triggering signal Q4-B;
the power supply circuit comprises a first power supply circuit and a second power supply circuit, the input end of the first power supply circuit is connected with the output end of the first optical coupling isolation circuit, the first optical coupling isolation circuit and the second optical coupling isolation circuit supply power, and the second power supply circuit is used for converting 5V direct current voltage into a fixed power VCC to supply power for the signal processing module and the signal amplification circuit.
Further setting: the current-limiting filter circuit comprises resistors R21, R22, R23 and a capacitor C8, one end of the resistor R22 is connected with the capacitor C8 in series and then connected with a signal ground SGND, the other end of the resistor R21 is connected with the output end of the signal amplification circuit, one end of the resistor R23 is connected with the signal ground SGND, and the other end of the resistor R23 is connected with the output end of the signal amplification circuit through the resistor R21.
Further setting: the signal processing module comprises a single chip microcomputer U5, and the single chip microcomputer U5 adopts a chip PCI12F 683.
Further setting: the first optical coupler isolation circuit comprises an optical coupler U2, resistors R4, R5 and R6, the anode of a diode at the input end of the optical coupler U2 is connected with the output end of the signal processing module through a resistor R4, the cathode of a diode at the input end of the optical coupler U2 is connected with a signal ground SGND, two ends of the resistor R6 are respectively connected with the cathode and the anode of a diode at the input end of the optical coupler U2, the collector at the output end of the optical coupler U2 is connected with the output end of the first power supply circuit through a resistor R5, and the emitter at the output end of the optical coupler U2 outputs a power supply trigger signal Q1-B to the input end of the first power supply;
the second opto-isolator circuit includes opto-coupler U3, resistance R7, R8, R9, the positive pole of opto-coupler U3 input end diode passes through resistance R8 and is connected with the output of signal processing module, the negative pole of opto-coupler U3 input end diode is connected with signal ground SGND, resistance R9's both ends respectively with the negative pole and the positive pole of opto-coupler U3 input end diode are connected, the collecting electrode of opto-coupler U3 output passes through resistance R7 and is connected with first power supply circuit's output, the emission utmost point of opto-coupler U2 output is to alarm drive circuit's input output alarm trigger signal Q4-B.
Further setting: the model of the optocoupler U2 or U3 is TLP 291.
Further setting: the signal amplification circuit comprises a first-stage differential amplification circuit and a second-stage differential amplification circuit, the first-stage differential amplification circuit comprises an operational amplifier U6A, resistors R15, R16 and a potentiometer RP2, a differential voltage VOUT-is connected with a forward input end of the operational amplifier U6A, a reverse input end of the operational amplifier U6A is connected with one end of a resistor R16, the other end of the resistor R16 is connected with a fixed power supply VCC and a signal ground SGND through a resistor R15 and a potentiometer RP2 respectively, a resistor R17 is connected between the reverse input end and an output end of the operational amplifier U6A,
the two-stage differential amplifying circuit comprises an operational amplifier U7A, resistors R18, R19 and a capacitor C7, the differential voltage VOUT + is connected to the positive input end of the operational amplifier U7A, the reverse input end of the operational amplifier U7A is connected with the output end of the operational amplifier U6A through a resistor R18, the resistor R19 and the capacitor C7 are connected in parallel to form a two-stage feedback circuit, two ends of the two-stage feedback circuit are respectively connected with the reverse input end and the output end of the operational amplifier U7A, the output end of the operational amplifier U7A outputs an oil voltage signal,
and a resistor R20 and a potentiometer RP1 are also connected in series between the inverting input end of the operational amplifier U7A and the inverting input end of the operational amplifier U6A.
Further setting: the output end of the operational amplifier U7A is connected with a resistor R14 and a capacitor C6, one end of the resistor R14 is connected with the output end of the operational amplifier U7A, and the other end of the resistor R14 is connected with a signal ground SGND through a capacitor C6.
To sum up, the utility model discloses following beneficial effect has: differential amplification is carried out on differential voltage output by the oil pressure sensor through a first-stage differential amplification circuit and a second-stage differential amplification circuit of the signal amplification circuit, so that a static working point is effectively stabilized, the reliability and the stability of an obtained engine oil voltage signal are ensured, and the influence of the change of external conditions on the circuit is inhibited. PWM signal and alarm signal that signal processing module output input alarm drive circuit and first power supply circuit after passing through opto-coupler isolation circuit, have realized electrical isolation completely, have improved the interference killing feature, job stabilization has avoided dedicated singlechip drive circuit, has simplified control circuit. The signal output adopts a PWM mode, and the reaction time is short. The current-limiting filter circuit shunts and filters the engine oil voltage signal, and the accuracy of data is ensured.
Drawings
FIG. 1 is a schematic block diagram of the overall structure of the embodiment;
FIG. 2 is a schematic diagram showing a configuration of a signal amplifying circuit in the embodiment;
FIG. 3 is a schematic diagram of a current-limiting filter circuit according to an embodiment;
FIG. 4 is a schematic structural diagram of a signal processing module in an embodiment;
FIG. 5 is a schematic structural diagram of an optical coupling isolation circuit in an embodiment;
FIG. 6 is a schematic diagram of the alarm driving circuit in the embodiment;
FIG. 7 is a schematic diagram showing a first power supply circuit in the embodiment;
fig. 8 is a schematic structural diagram of a second power supply circuit in the embodiment.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
Example (b):
as shown in fig. 1, a dual output oil pressure sensor regulator circuit, comprising: the oil pressure sensor comprises an oil pressure sensor and a signal adjusting circuit, wherein the signal adjusting circuit comprises a signal amplifying circuit, a current-limiting filter circuit, a signal processing module, an optical coupling isolation circuit, an alarm driving circuit and a power supply circuit. The oil pressure sensor is used to detect the oil pressure and output differential voltages VOUT + and VOUT-.
As shown in fig. 2, the signal amplification circuit is connected to two output terminals of the oil pressure sensor, differentially amplifies the differential voltages VOUT + and VOUT-, and outputs an oil voltage signal. The differential voltages VOUT + and VOUT-detected and output by the oil pressure sensor are only millivolt level and cannot be directly transmitted to the signal processing module for operation processing, and the signal amplification circuit amplifies the differential voltages VOUT + and VOUT-and provides the amplified differential voltages for the signal processing module. The signal amplifying circuit comprises a primary differential amplifying circuit and a secondary differential amplifying circuit, the primary differential amplifying circuit comprises an operational amplifier U6A, resistors R15 and R16 and a potentiometer RP2, a differential voltage VOUT-is connected to a forward input end of the operational amplifier U6A, an inverting input end of the operational amplifier U6A is connected with one end of the resistor R16, the other end of the resistor R16 is connected with a fixed power supply VCC and a signal ground SGND through the resistor R15 and the potentiometer RP2 respectively, a resistor R17 is connected between the inverting input end and an output end of the operational amplifier U6A, the secondary differential amplifying circuit comprises an operational amplifier U7A, resistors R18 and R19 and a capacitor C7, a differential voltage VOUT + is connected to a forward input end of the operational amplifier U7A, an inverting input end of the operational amplifier U7A is connected with an output end of the operational amplifier U6A through the resistor R18, the resistor R19 and the capacitor C7 are connected in parallel to form a secondary feedback circuit, two ends of the secondary feedback circuit are connected with an inverting input end of the operational, an output end of the operational amplifier U7A outputs an oil voltage signal, a resistor R20 and a potentiometer RP1 are further connected in series between an inverting input end of the operational amplifier U7A and an inverting input end of the operational amplifier U6A, an output end of the operational amplifier U7A is connected with a resistor R14 and a capacitor C6, one end of the resistor R14 is connected with an output end of the operational amplifier U7A, and the other end of the resistor R14 is connected with a signal ground SGND through a capacitor C6. The signal obtained by differentially amplifying VOUT-at the forward input end and reference voltage at the reverse input end of the operational amplifier U6A by the primary differential amplifying circuit is used as the reference voltage at the reverse input end of the secondary differential amplifying circuit, and the signal is differentially amplified with VOUT + at the forward input end to obtain an engine oil voltage signal, so that the influence of the change of external conditions on the circuit is inhibited, and the reliability and the stability of the engine oil voltage signal are ensured.
As shown in fig. 3, the current-limiting filter circuit is connected to the output terminal of the signal amplification circuit, and is configured to shunt and filter the engine oil voltage signal and transmit the smoothed voltage signal to the signal processing module. The current-limiting filter circuit comprises resistors R21, R22, R23 and a capacitor C8, one end of the resistor R22 is connected with the capacitor C8 in series and then is connected with a signal ground SGND, the other end of the resistor R21 is connected with the output end of the signal amplification circuit, one end of the resistor R23 is connected with the signal ground SGND, and the other end of the resistor R23 is connected with the output end of the signal amplification circuit through the resistor R21.
As shown in fig. 4, the signal processing module is connected to the output end of the current-limiting filter circuit, receives the smoothed voltage signal, calculates to obtain the real-time pressure, and outputs the PWM signal and the alarm signal WK-CON. The signal processing module comprises a single chip microcomputer U5, the single chip microcomputer U5 adopts a chip PCI12F683 to collect a smooth voltage signal output by the current-limiting filter circuit, calculates the current pressure, outputs a PWM signal to the first optical coupling isolation circuit, and outputs an alarm signal WK-CON to the second optical coupling isolation circuit when the calculated pressure is too high and an alarm needs to be given.
As shown in fig. 5, the optical coupling isolation circuit includes a first optical coupling isolation circuit and a second optical coupling isolation circuit, an input end of the first optical coupling isolation circuit is connected with an output end of the signal processing module, receives the PWM signal and outputs a power trigger signal Q1-B, an input end of the second optical coupling isolation circuit is connected with another output end of the signal processing module, receives the alarm signal WK-CON and outputs an alarm trigger signal Q4-B. The first optical coupler isolation circuit comprises an optical coupler U2, a resistor R4, R5 and R6, the anode of a diode at the input end of the optical coupler U2 is connected with the output end of the signal processing module through a resistor R4, the cathode of a diode at the input end of the optical coupler U2 is connected with a signal ground SGND, two ends of the resistor R6 are respectively connected with the cathode and the anode of a diode at the input end of the optical coupler U2, the collector at the output end of the optical coupler U2 is connected with the output end of the first power circuit through a resistor R5, and the emitter at the output end of the optical coupler U2 outputs a power supply trigger signal Q1-B to the input. The second optical coupler isolation circuit comprises an optical coupler U3, a resistor R7, R8 and R9, the anode of a diode at the input end of the optical coupler U3 is connected with the output end of the signal processing module through a resistor R8, the cathode of a diode at the input end of the optical coupler U3 is connected with a signal ground SGND, two ends of the resistor R9 are respectively connected with the cathode and the anode of a diode at the input end of the optical coupler U3, the collector at the output end of the optical coupler U3 is connected with the output end of the first power circuit through a resistor R7, and the emitter at the output end of the optical coupler U2 outputs an alarm trigger signal Q4-B to the input. The model of the optocoupler U2 or U3 is TLP 291. PWM signal and alarm signal that signal processing module output input alarm drive circuit and first power supply circuit after passing through opto-coupler isolation circuit, have realized electrical isolation completely, have improved the interference killing feature, job stabilization has avoided dedicated singlechip drive circuit, has simplified control circuit.
As shown in fig. 6, the alarm driving circuit includes an indicator light D3, a transistor Q2, a transistor Q3, a resistor R3, and a capacitor C2, wherein an input end of the alarm driving circuit is connected to an output end of the second opto-isolator circuit, and the alarm driving circuit drives the indicator light D3 to be turned on or off according to a received alarm trigger signal Q4-B. The base electrode of the triode Q2 is connected with the emitting electrode of the output end of the second optical coupling isolation circuit, the emitting electrode of the triode Q2 is connected with the base electrode of the triode Q3, and the collector electrode of the triode Q2 is connected with the collector electrode of the triode Q3. The emitter of the triode Q3 is connected with the ground, the anode of the indicator light D3 is connected with the emitter of the triode Q3, the cathode of the indicator light D3 is connected with the collector of the triode Q3, and the capacitor C2 is connected with the two ends of the indicator light D3 in parallel.
As shown in fig. 7 and 8, the power supply circuit includes a first power supply circuit and a second power supply circuit, an input end of the first power supply circuit is connected to an output end of the first optical coupling isolation circuit to supply power to the first optical coupling isolation circuit and the second optical coupling isolation circuit, when a power supply trigger signal Q1-B is at a high level, the electrolytic capacitor E1 is charged, when a power supply trigger signal Q1-B is at a low level, the electrolytic capacitor E1 discharges, and a voltage of 3.3V can be obtained at a VOUT end of the U1, where the U1 is an LM2950-CZ 33. The second power supply circuit is used for converting externally accessed 5V direct current voltage into a fixed power supply VCC to supply power for the signal processing module and the signal amplifying circuit.
The utility model discloses a signal amplification circuit's one-level difference amplifier circuit and second grade difference amplifier circuit carry out the difference to the differential voltage of oil pressure sensor output and amplify output machine oil voltage signal, stabilize static operating point effectively, guarantee the reliability and the stability of the machine oil voltage signal who obtains, restrain the influence of taking the circuit by external condition's change. The current-limiting filter circuit shunts and filters the engine oil voltage signal, and the accuracy of data is ensured. PWM signal and alarm signal that signal processing module output input alarm drive circuit and first power supply circuit after passing through opto-coupler isolation circuit, have realized electrical isolation completely, have improved the interference killing feature, job stabilization has avoided dedicated singlechip drive circuit, has simplified control circuit.
The above-described embodiments do not limit the scope of the present invention. Any modification, equivalent replacement, and improvement made within the spirit and principle of the above-described embodiments should be included in the protection scope of the technical solution.
Claims (7)
1. Dual output oil pressure sensor adjustment circuit, its characterized in that includes: the oil pressure sensor and the signal adjusting circuit, the signal adjusting circuit comprises a signal amplifying circuit, a current-limiting filter circuit, a signal processing module, an optical coupling isolation circuit, an alarm driving circuit and a power circuit,
the oil pressure sensor is used for detecting the oil pressure and outputting differential voltage VOUT + and VOUT-;
the signal amplification circuit is connected with two output ends of the oil pressure sensor, and is used for differentially amplifying differential voltages VOUT + and VOUT-and outputting an engine oil voltage signal;
the current-limiting filter circuit is connected with the output end of the signal amplification circuit, and outputs a smooth voltage signal after shunting and filtering the engine oil voltage signal;
the signal processing module is connected with the output end of the current-limiting filter circuit, receives the smooth voltage signal, calculates to obtain real-time pressure and outputs a PWM signal and an alarm signal WK-CON;
the optical coupling isolation circuit comprises a first optical coupling isolation circuit and a second optical coupling isolation circuit, the input end of the first optical coupling isolation circuit is connected with one output end of the signal processing module, receives the PWM signal and outputs a power supply trigger signal Q1-B,
the input end of the second optical coupling isolation circuit is connected with the other output end of the signal processing module, receives an alarm signal WK-CON and outputs an alarm trigger signal Q4-B;
the alarm driving circuit comprises an indicator lamp D3, the input end of the alarm driving circuit is connected with the output end of the second optical coupling isolation circuit, and the indicator lamp D3 is driven to be switched on and off according to a received alarm triggering signal Q4-B;
the power supply circuit comprises a first power supply circuit and a second power supply circuit, the input end of the first power supply circuit is connected with the output end of the first optical coupling isolation circuit, the first optical coupling isolation circuit and the second optical coupling isolation circuit supply power, and the second power supply circuit is used for converting 5V direct current voltage into a fixed power VCC to supply power for the signal processing module and the signal amplification circuit.
2. The dual-output oil pressure sensor adjusting circuit as claimed in claim 1, wherein the current-limiting filter circuit comprises resistors R21, R22, R23 and a capacitor C8, one end of the resistor R22 is connected in series with the capacitor C8 and then connected to the signal ground SGND, the other end of the resistor R22 is connected to the output end of the signal amplifying circuit through a resistor R21, one end of the resistor R23 is connected to the signal ground SGND, and the other end of the resistor R23 is connected to the output end of the signal amplifying circuit through a resistor R21.
3. The dual-output oil pressure sensor adjusting circuit as claimed in claim 1, wherein the signal processing module comprises a single-chip microcomputer U5, and the single-chip microcomputer U5 adopts a chip PCI12F 683.
4. The dual-output engine oil pressure sensor adjusting circuit of claim 1, wherein the first optical coupler isolation circuit comprises an optical coupler U2, resistors R4, R5 and R6, an anode of a diode at an input end of the optical coupler U2 is connected to an output end of the signal processing module through a resistor R4, a cathode of a diode at an input end of the optical coupler U2 is connected to an SGND of a signal ground, two ends of the resistor R6 are respectively connected to a cathode and an anode of a diode at an input end of the optical coupler U2, a collector at an output end of the optical coupler U2 is connected to an output end of the first power supply circuit through a resistor R5, and an emitter at an output end of the optical coupler U2 outputs a power supply trigger signal Q1-B to the input end of the first power supply circuit;
the second opto-isolator circuit includes opto-coupler U3, resistance R7, R8, R9, the positive pole of opto-coupler U3 input end diode passes through resistance R8 and is connected with the output of signal processing module, the negative pole of opto-coupler U3 input end diode is connected with signal ground SGND, resistance R9's both ends respectively with the negative pole and the positive pole of opto-coupler U3 input end diode are connected, the collecting electrode of opto-coupler U3 output passes through resistance R7 and is connected with first power supply circuit's output, the emission utmost point of opto-coupler U2 output is to alarm drive circuit's input output alarm trigger signal Q4-B.
5. The dual-output oil pressure sensor adjusting circuit according to claim 4, wherein the type of the optocouplers U2 and U3 is TLP 291.
6. The dual-output oil pressure sensor adjusting circuit of claim 1, characterized in that the signal amplifying circuit comprises a first-stage differential amplifying circuit and a second-stage differential amplifying circuit, the first-stage differential amplifying circuit comprises an operational amplifier U6A, resistors R15, R16 and a potentiometer RP2, the differential voltage VOUT-is connected to a positive input terminal of the operational amplifier U6A, a negative input terminal of the operational amplifier U6A is connected to one terminal of the resistor R16, the other terminal of the resistor R16 is connected to a fixed power source VCC and a signal ground SGND through the resistor R15 and the potentiometer RP2 respectively, a resistor R17 is connected between the negative input terminal and the output terminal of the operational amplifier U6A,
the two-stage differential amplifying circuit comprises an operational amplifier U7A, resistors R18, R19 and a capacitor C7, the differential voltage VOUT + is connected to the positive input end of the operational amplifier U7A, the reverse input end of the operational amplifier U7A is connected with the output end of the operational amplifier U6A through a resistor R18, the resistor R19 and the capacitor C7 are connected in parallel to form a two-stage feedback circuit, two ends of the two-stage feedback circuit are respectively connected with the reverse input end and the output end of the operational amplifier U7A, the output end of the operational amplifier U7A outputs an oil voltage signal,
and a resistor R20 and a potentiometer RP1 are also connected in series between the inverting input end of the operational amplifier U7A and the inverting input end of the operational amplifier U6A.
7. The dual-output oil pressure sensor adjusting circuit as claimed in claim 6, wherein a resistor R14 and a capacitor C6 are connected to the output terminal of the operational amplifier U7A, one end of the resistor R14 is connected to the output terminal of the operational amplifier U7A, and the other end of the resistor R14 is connected to a signal ground SGND through a capacitor C6.
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| CN202021948481.6U CN212867664U (en) | 2020-09-08 | 2020-09-08 | Dual-output engine oil pressure sensor adjusting circuit |
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| CN202021948481.6U CN212867664U (en) | 2020-09-08 | 2020-09-08 | Dual-output engine oil pressure sensor adjusting circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114354021A (en) * | 2021-12-27 | 2022-04-15 | 武汉航空仪表有限责任公司 | Anti-interference pressure transmitting circuit |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114354021A (en) * | 2021-12-27 | 2022-04-15 | 武汉航空仪表有限责任公司 | Anti-interference pressure transmitting circuit |
| CN114354021B (en) * | 2021-12-27 | 2024-05-24 | 武汉航空仪表有限责任公司 | Anti-interference pressure transmitting circuit |
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