CN102621433A - Failure detection equipment for sensors of internal combustion engine - Google Patents
Failure detection equipment for sensors of internal combustion engine Download PDFInfo
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- CN102621433A CN102621433A CN2012101146266A CN201210114626A CN102621433A CN 102621433 A CN102621433 A CN 102621433A CN 2012101146266 A CN2012101146266 A CN 2012101146266A CN 201210114626 A CN201210114626 A CN 201210114626A CN 102621433 A CN102621433 A CN 102621433A
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Abstract
The embodiment of the invention discloses failure detection equipment for sensors of an internal combustion engine. The failure detection equipment comprises a host, wherein the host comprises a multi-channel selection unit, a measurement unit and a micro control unit (MCU); the multi-channel selection unit is connected with a specified sensor of the internal combustion engine and used for sending a sensor signal of the specified sensor to the measurement unit through a specified signal channel according to a channel switching instruction of the MCU; the measurement unit is used for measuring the sensor signal and sending a measurement result to the MCU; and the MCU is used for acquiring a signal type of the specified sensor in a sensor parameter list which is pre-stored in the host according to the type of the specified sensor, sending the channel switching instruction to the multi-channel selection unit according to the signal type, converting the measurement result which is received into a measurement value of the specified sensor and outputting the measurement value. The measurement value of the sensor can be accurately acquired, misjudgment is avoided, various sensors can be detected, and the failure detection equipment for the sensors of the internal combustion engine is high in adaptability and high in efficiency.
Description
Technical field
The present invention relates to the internal combustion engine detection range, especially relate to a kind of integral engine control sensor fault test set.
Background technology
Along with the develop rapidly of sensor technology, sensor kind and the quantity used in the internal combustion engine are more and more many, especially heavy large power, electrically controlling diesel engine.The control module ECU of internal combustion engine need install the high-precision sensor of One's name is legion at the internal combustion engine key position for reaching the operation of accurate controlling combustion engine, and these numerous sensors have fault to take place when inevitably understanding in use.
In the prior art, when running into dependent failure, do not have relevant sensor fault checkout equipment available at present, the maintenance personal only can rely on multimeter to carry out simple resistance, voltage signal is measured.Like this, rely on maintenance personal's own level to judge fully when solving fault, be easy to record error result and cause erroneous judgement; In addition, because number of sensors is numerous, parameter is different, therefore, each sensor needs the multimeter of constantly adjusting multimeter even constantly changing different model when being carried out fault detect; Bad adaptability; The slow efficient of speed is low, and very easily obscures, thereby also causes erroneous judgement easily.
Summary of the invention
The purpose of the embodiment of the invention provides the integral engine control sensor fault test set, to obtain the data of each sensor of internal combustion engine fast and accurately, avoids causing erroneous judgement.
The embodiment of the invention discloses a kind of integral engine control sensor fault test set, comprise main frame; Said main frame comprises hyperchannel selected cell, measuring unit and micro-control unit MCU;
Said hyperchannel selected cell: be used to connect the specified sensor of internal combustion engine, and the sensor signal of said specified sensor sent to said measuring unit through channel designation signal according to the passage switching command of said MCU;
Said measuring unit: be used for said sensor signal is measured, obtain measurement result, and said measurement result is sent to said MCU through mould/number conversion;
Said MCU: be used for obtaining the signal type of said specified sensor according to the sensor parameters tabulation that the model of said specified sensor prestores at said main frame, and according to said signal type to said hyperchannel selected cell sendaisle switching command; With receive measurement result convert into said specified sensor measurement numerical value and output.
Preferably, said MCU also is used for: referential data and output that said specified sensor is obtained in the said sensor parameters tabulation that prestores at said main frame according to the model of said specified sensor.
Preferably, said hyperchannel selected cell specifically comprises: hyperchannel input interface, some bars passages, passage change-over switch and ON-OFF control circuit;
Specified sensor, the other end that one end of said hyperchannel input interface is used to connect internal combustion engine link to each other with said measuring unit after said some bars passages, said passage change-over switch successively;
Said passage change-over switch also links to each other with said MCU through said ON-OFF control circuit;
Said ON-OFF control circuit is operated said passage change-over switch according to the passage switching command of said MCU, so that the channel designation signal of the sensor signal of said specified sensor in said some signalling channels sends to said measuring unit.
Preferably, said some bars passages specifically comprise: voltage signal passage, resistance signal passage, channel current signal, pulse width modulation (PWM) signalling channel, tacho-pulse passage.
Preferably, said measuring unit specifically comprises: measure way circuit and control interface circuit;
Said measurement way circuit comprises match circuit, metering circuit and the communication interface that connects successively; Said match circuit links to each other with said hyperchannel selected cell, is used for being complementary with said channel designation signal; Said metering circuit is used for said sensor signal is measured, and obtains measurement result through mould/number conversion; Said communication interface links to each other with said MCU, is used for said measurement result is sent to said MCU;
One end of said control interface circuit links to each other with said MCU, the other end links to each other with said measurement way circuit, is used for according to the mode of operation instruction of said MCU said measurement way circuit being switched to the mode of operation that is complementary with said sensor signal.
Preferably, said main frame also comprises: the interface buffer circuit is used for when measuring high voltage and/or big electric current for guaranteeing that said device security carries out step-down and/or isolation processing; The said measurement result that said measuring unit sends sends to said MCU behind said interface buffer circuit.
The embodiment of the invention is used and is comprised that the main frame of hyperchannel selected cell, measuring unit and micro-control unit MCU detects integral engine control sensor; Not only can get access to the measurement numerical value of sensor accurately; Avoid causing erroneous judgement; But also can detect multiple sensors, adaptability is strong, and efficient is high.
Description of drawings
In order to be illustrated more clearly in the embodiment of the invention or technical scheme of the prior art; To do to introduce simply to the accompanying drawing of required use in embodiment or the description of the Prior Art below; Obviously, the accompanying drawing in describing below only is some embodiments of the present invention, for those of ordinary skills; Under the prerequisite of not paying creative work, can also obtain other accompanying drawing according to these accompanying drawings.
Fig. 1 is the structural representation of equipment in the embodiment of the invention one;
Fig. 2 is the principle schematic of equipment in the embodiment of the invention one.
Embodiment
To combine the accompanying drawing in the embodiment of the invention below, the technical scheme in the embodiment of the invention is carried out clear, intactly description, obviously, described embodiment only is the present invention's part embodiment, rather than whole embodiment.Based on the embodiment among the present invention, those of ordinary skills are not making the every other embodiment that is obtained under the creative work prerequisite, all belong to the scope of the present invention's protection.
Fig. 1 is the structural representation of embodiment of the invention equipment.Said equipment comprises main frame; Said main frame comprises hyperchannel selected cell, measuring unit and micro-control unit MCU.Hyperchannel selected cell, measuring unit and MCU three are connected successively, and the hyperchannel selected cell also directly links to each other with MCU simultaneously, referring to shown in Figure 1.Describe respectively in the face of hyperchannel selected cell, measuring unit and MCU down:
(1) said hyperchannel selected cell: be used to connect the specified sensor of internal combustion engine, and the sensor signal of said specified sensor sent to said measuring unit through channel designation signal according to the passage switching command of said MCU.Because main frame can connect various sensors in use, and the signal type of various kinds of sensors is not quite similar,, make various sensors can pass through the appropriate signal passage and get into measuring unit so at first be provided with this hyperchannel selected cell in the main frame.
Fig. 2 is the principle schematic of embodiment of the invention equipment.Preferably, said hyperchannel selected cell specifically can comprise: hyperchannel input interface, some bars passages, passage change-over switch, ON-OFF control circuit, and referring to shown in Figure 2.
Specified sensor, the other end that one end of said hyperchannel input interface is used to connect internal combustion engine link to each other with said measuring unit after said some bars passages, said passage change-over switch successively.Said specified sensor can be that cooling-water temperature sensor, intake air temperature pressure transducer, engine oil pressure temperature sensor or speed probe etc. are multiple.Said some bars passages specifically can comprise: voltage signal passage, resistance signal passage, channel current signal, pulse width modulation (PWM) signalling channel, tacho-pulse passage etc. one or more, referring to shown in Figure 2.
Said passage change-over switch also links to each other with said MCU through said ON-OFF control circuit; Said ON-OFF control circuit is operated said passage change-over switch according to the passage switching command of said MCU, so that the channel designation signal of the sensor signal of said specified sensor in said some signalling channels sends to said measuring unit.Said passage change-over switch can be made up of a plurality of relay switches, referring to shown in Figure 2.
(2) said measuring unit: be used for said sensor signal is measured, obtain measurement result, and said measurement result is sent to said MCU through mould/number conversion.Referring to shown in Figure 2, preferred, said measuring unit specifically can comprise: measure way circuit and control interface circuit.Said measurement way circuit comprises match circuit, metering circuit and the communication interface that connects successively.
Said match circuit links to each other with said hyperchannel selected cell, is used for being complementary with said channel designation signal.Because the output of hyperchannel selected cell is the dissimilar signal through the unlike signal passage; In other words the difference because of the sensor that inserts makes input signal have diversity; So measuring unit is provided with said match circuit, specifically can be used for the reference voltage to said metering circuit, the reference voltage of measuring passage, the scope of sample of signal and mate.
Said metering circuit is used for said sensor signal is measured, and obtains measurement result through mould/number conversion.Specifically, said metering circuit is inner integrated such as automatic gear change-over switch, RS232 communicating circuit, voltage adjuster, measurement result computing circuit functions such as (calculating corresponding signal according to the ADC value).Said metering circuit essence is one 12 high-speed ADC (Analog-to-Digital Converter; Analog to digital converter); Reference voltage V ref is as the voltage reference of ADC, and the signal voltage of supposing to be input to ADC is Vin (through the signal after the conversion), and the numerical coding that then obtains through ADC is N=(Vin/Vref) * 4096; Said metering circuit is according to this corresponding relation; Consider that more current selection gear can calculate corresponding signal value, this value is in the same place with the unit integration of signal, just can be used as measurement result.
Measure the reference voltage of passage, main effect is the range of signal that limits each gear.For example: concerning DC voltage; General gear is divided into 5 grades; Be respectively 0-200mV, 200mV-2V, 2V-20V, 20V-200V, more than the 200V; Can be designed with the switch conduction state that the accurate voltage comparer is controlled different gears in said metering circuit inside, thereby accomplish the automatic switchover of gear.The threshold voltage of case of internal comparer is 0.2V (this value is just confirmed at the beginning of said metering circuit design); Get input voltage respectively for the resistor network of realizing normal each gear of switching of gear in the unlike signal scope 1 times, 0.1 times, 0.01 times, 0.001 times and 0.0001 times; So just can confirm the switch needs connection of which gear according to the output level of comparer, not need outside intervention.As aforementioned, because of the restriction of ADC figure place, can not exceed the value of reference voltage V ref through the voltage signal scope that is input to ADC after the conversion, otherwise can cause overflowing of data, measurement result is just nonsensical.For guaranteeing that input voltage vin is no more than Vref, must the sampling of signal be limited.For example: concerning a dc current signal I, its sample resistance is R, and the value of R must satisfy I * R≤Vref.Other types signal principle is similar, only is that sampling mode is different.Fibrous root is confirmed the parameter of sample circuit according to the scope of want measuring-signal.
Said communication interface links to each other with said MCU, is used for said measurement result is sent to said MCU.In the present embodiment, said communication interface specifically can be the RS232 interface.
One end of said control interface circuit links to each other with said MCU, the other end links to each other with said measurement way circuit, is used for according to the mode of operation instruction of said MCU said measurement way circuit being switched to the mode of operation that is complementary with said sensor signal.In addition, the unit of measuring accuracy, gear, measurement result also can write specific value to the internal register of said metering circuit through said interface control circuit and realizes.
(3) said MCU: be used for obtaining the signal type of said specified sensor according to the sensor parameters tabulation that the model of said specified sensor prestores at said main frame, and according to said signal type to said hyperchannel selected cell sendaisle switching command; With receive measurement result convert into said specified sensor measurement numerical value and output.Specifically; Every at a distance from the set time (being the multiple of 1/3S) in measuring process; Said metering circuit is sent measurement result to MCU; (this result is voltage, electric current, frequency or dutyfactor value etc.) calculated the temperature, pressure, rotating speed etc. of sensor environment of living in again after MCU parsed measurement result according to communications protocol according to the sensor parameters table, exported to the user at last.
Referring to shown in Figure 2, in the present embodiment, that said MCU specifically adopts is ARM-CORTEXM3 MCU.The measurement result of measuring unit mails to MCU through the RS232 communication interface, and said measurement result can be voltage, resistance, electric current or frequency, dutycycle; MCU carries out filtering also according to the calculation of parameter program of the respective sensor that presets to said measurement result, obtains final temperature, pressure, tachometer value etc. and measures numerical value and output.The user just can judge sensor status after obtaining measuring numerical value accurately, thereby has avoided erroneous judgement.If measure numerical value in the error range that allows then the decidable sensor is normal, otherwise think that sensor breaks down.
Preferably, said MCU also is used for: referential data and output that said specified sensor is obtained in the said sensor parameters tabulation that prestores at said main frame according to the model of said specified sensor.Like this, the user not only can obtain to measure numerical value, can also compare with referential data simultaneously, and is convenient, judge sensor status efficiently.
Preferably, said main frame can also comprise: the interface buffer circuit is used for when measuring high voltage and/or big electric current for guaranteeing that said device security carries out step-down and/or isolation processing; The said measurement result that said measuring unit sends sends to said MCU behind said interface buffer circuit.Referring to shown in Figure 2, the interface buffer circuit carries out step-down and/or isolation processing, to guarantee the security of said equipment when measuring high voltage and/or big electric current between MCU and measuring unit.
In addition, referring to shown in Figure 2, said main frame can also comprise display module and operation keyboard, is used to show all kinds of numerical value and main frame is carried out each generic operation, setting.Said main frame can also comprise eeprom memory, is used for information such as storage sensor parameter list, calculation of parameter program.Can also comprise USB interface, be used to connect outer PC, make things convenient for the upgrading of program, the transmission of data etc.In addition, said main frame can also pass through power interface, holding circuit, filtering circuit, DC-DC step-down and link to each other with the accumulator of outside, to realize power supply.
Sketch in the face of the use of present embodiment equipment down: the user is linked into certain sensor on the main frame through special-purpose wire harness; MCU is according to the sensor parameters tabulation that prestores in the automatic base unit search of user-selected sensor model number simultaneously; Tell the sensor signal type; Send the passage switching command according to signal type to the hyperchannel selected cell then; Through ON-OFF control circuit control channel change-over switch, make sensor signal to enter into metering circuit through the suitable signalling channel that is complementary; MCU also can send the mode of operation instruction to measuring unit, switches to the mode of operation that is complementary with said sensor signal with measuring way circuit; Measuring unit obtains measurement result and sends to MCU after said sensor signal is handled, and MCU converts said measurement result into measurement numerical value, is shown to the user, so that the user judges this sensor status.
Need to prove; In this article; Relational terms such as first and second grades only is used for an entity or operation are made a distinction with another entity or operation, and not necessarily requires or hint relation or the order that has any this reality between these entities or the operation.And; Term " comprises ", " comprising " or its any other variant are intended to contain comprising of nonexcludability; Thereby make and comprise that process, method, article or the equipment of a series of key elements not only comprise those key elements; But also comprise other key elements of clearly not listing, or also be included as this process, method, article or equipment intrinsic key element.Under the situation that do not having much more more restrictions, the key element that limits by statement " comprising ... ", and be not precluded within process, method, article or the equipment that comprises said key element and also have other identical element.
The above is merely preferred embodiment of the present invention, is not to be used to limit protection scope of the present invention.Used concrete example among this paper and principle of the present invention and embodiment have been carried out lock stated, the explanation of above embodiment just is used for helping to understand method of the present invention and core concept thereof; Simultaneously, for one of ordinary skill in the art, according to thought of the present invention, part all can change on embodiment and range of application.In sum, this description should not be construed as limitation of the present invention.All any modifications of within spirit of the present invention and principle, being done, be equal to replacement, improvement etc., all be included in protection scope of the present invention.
Claims (6)
1. an integral engine control sensor fault test set is characterized in that, comprises main frame; Said main frame comprises hyperchannel selected cell, measuring unit and micro-control unit MCU;
Said hyperchannel selected cell: be used to connect the specified sensor of internal combustion engine, and the sensor signal of said specified sensor sent to said measuring unit through channel designation signal according to the passage switching command of said MCU;
Said measuring unit: be used for said sensor signal is measured, obtain measurement result, and said measurement result is sent to said MCU through mould/number conversion;
Said MCU: be used for obtaining the signal type of said specified sensor according to the sensor parameters tabulation that the model of said specified sensor prestores at said main frame, and according to said signal type to said hyperchannel selected cell sendaisle switching command; With receive measurement result convert into said specified sensor measurement numerical value and output.
2. equipment according to claim 1 is characterized in that, said MCU also is used for: referential data and output that said specified sensor is obtained in the said sensor parameters tabulation that prestores at said main frame according to the model of said specified sensor.
3. equipment according to claim 1 and 2 is characterized in that, said hyperchannel selected cell specifically comprises: hyperchannel input interface, some bars passages, passage change-over switch and ON-OFF control circuit;
Specified sensor, the other end that one end of said hyperchannel input interface is used to connect internal combustion engine link to each other with said measuring unit after said some bars passages, said passage change-over switch successively;
Said passage change-over switch also links to each other with said MCU through said ON-OFF control circuit;
Said ON-OFF control circuit is operated said passage change-over switch according to the passage switching command of said MCU, so that the channel designation signal of the sensor signal of said specified sensor in said some signalling channels sends to said measuring unit.
4. equipment according to claim 3 is characterized in that, said some bars passages specifically comprise: voltage signal passage, resistance signal passage, channel current signal, pulse width modulation (PWM) signalling channel, tacho-pulse passage.
5. equipment according to claim 1 and 2 is characterized in that, said measuring unit specifically comprises: measure way circuit and control interface circuit;
Said measurement way circuit comprises match circuit, metering circuit and the communication interface that connects successively; Said match circuit links to each other with said hyperchannel selected cell, is used for being complementary with said channel designation signal; Said metering circuit is used for said sensor signal is measured, and obtains measurement result through mould/number conversion; Said communication interface links to each other with said MCU, is used for said measurement result is sent to said MCU;
One end of said control interface circuit links to each other with said MCU, the other end links to each other with said measurement way circuit, is used for according to the mode of operation instruction of said MCU said measurement way circuit being switched to the mode of operation that is complementary with said sensor signal.
6. equipment according to claim 1 and 2 is characterized in that, said main frame also comprises: the interface buffer circuit is used for when measuring high voltage and/or big electric current for guaranteeing that said device security carries out step-down and/or isolation processing; The said measurement result that said measuring unit sends sends to said MCU behind said interface buffer circuit.
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| CN2012101146266A CN102621433A (en) | 2012-04-18 | 2012-04-18 | Failure detection equipment for sensors of internal combustion engine |
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| CN2012101146266A CN102621433A (en) | 2012-04-18 | 2012-04-18 | Failure detection equipment for sensors of internal combustion engine |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104764544A (en) * | 2015-03-20 | 2015-07-08 | 国核自仪系统工程有限公司 | Temperature signal auto-diagnosis circuit and diagnosis method thereof |
| CN106249093A (en) * | 2016-07-22 | 2016-12-21 | 上海新时达电气股份有限公司 | Automatically differentiate and detect the devices and methods therefor of pre-buried sensor in electrical equipment |
| CN108363380A (en) * | 2017-01-26 | 2018-08-03 | 英飞凌科技股份有限公司 | Sensor controller and sensor-signal receiver and its method |
| CN112881961A (en) * | 2021-01-27 | 2021-06-01 | 江西晶润光学有限公司 | Detection device and method for magnetic sensor |
| CN115220020A (en) * | 2022-03-24 | 2022-10-21 | 广州汽车集团股份有限公司 | Ultrasonic radar fault detection method and ECU |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN200976287Y (en) * | 2006-11-28 | 2007-11-14 | 李文亭 | High-precision multifunctional procedure signal check meter |
| CN200989915Y (en) * | 2006-06-14 | 2007-12-12 | 王悦 | Digital universal meter with programmable multichannel inspection measurement function |
| CN101105691A (en) * | 2007-05-23 | 2008-01-16 | 深圳市合信自动化技术有限公司 | Input and output enlargement module and programmable controller system |
| KR100860474B1 (en) * | 2008-01-03 | 2008-09-26 | (주)비트밸리 | Usn integration module for external sensors |
| KR100985983B1 (en) * | 2008-07-09 | 2010-10-06 | 금오기전 주식회사 | Diesel engine status monitoring and alarm device with multi channel which is consisted of input for temperature and pressure signal |
| CN201917825U (en) * | 2010-12-09 | 2011-08-03 | 煤炭科学研究总院沈阳研究院 | On-line tester for coal mine safety monitoring system |
-
2012
- 2012-04-18 CN CN2012101146266A patent/CN102621433A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN200989915Y (en) * | 2006-06-14 | 2007-12-12 | 王悦 | Digital universal meter with programmable multichannel inspection measurement function |
| CN200976287Y (en) * | 2006-11-28 | 2007-11-14 | 李文亭 | High-precision multifunctional procedure signal check meter |
| CN101105691A (en) * | 2007-05-23 | 2008-01-16 | 深圳市合信自动化技术有限公司 | Input and output enlargement module and programmable controller system |
| KR100860474B1 (en) * | 2008-01-03 | 2008-09-26 | (주)비트밸리 | Usn integration module for external sensors |
| KR100985983B1 (en) * | 2008-07-09 | 2010-10-06 | 금오기전 주식회사 | Diesel engine status monitoring and alarm device with multi channel which is consisted of input for temperature and pressure signal |
| CN201917825U (en) * | 2010-12-09 | 2011-08-03 | 煤炭科学研究总院沈阳研究院 | On-line tester for coal mine safety monitoring system |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104764544A (en) * | 2015-03-20 | 2015-07-08 | 国核自仪系统工程有限公司 | Temperature signal auto-diagnosis circuit and diagnosis method thereof |
| CN106249093A (en) * | 2016-07-22 | 2016-12-21 | 上海新时达电气股份有限公司 | Automatically differentiate and detect the devices and methods therefor of pre-buried sensor in electrical equipment |
| CN108363380A (en) * | 2017-01-26 | 2018-08-03 | 英飞凌科技股份有限公司 | Sensor controller and sensor-signal receiver and its method |
| CN112881961A (en) * | 2021-01-27 | 2021-06-01 | 江西晶润光学有限公司 | Detection device and method for magnetic sensor |
| CN112881961B (en) * | 2021-01-27 | 2024-04-09 | 广州得尔塔影像技术有限公司 | Detection device and method of magnetic sensor |
| CN115220020A (en) * | 2022-03-24 | 2022-10-21 | 广州汽车集团股份有限公司 | Ultrasonic radar fault detection method and ECU |
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Application publication date: 20120801 |