CN201269862Y - Failure monitoring apparatus for oxygen sensor - Google Patents
Failure monitoring apparatus for oxygen sensor Download PDFInfo
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- CN201269862Y CN201269862Y CNU200820212159XU CN200820212159U CN201269862Y CN 201269862 Y CN201269862 Y CN 201269862Y CN U200820212159X U CNU200820212159X U CN U200820212159XU CN 200820212159 U CN200820212159 U CN 200820212159U CN 201269862 Y CN201269862 Y CN 201269862Y
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Abstract
The utility model provides an oxygen sensor failure monitoring device which comprises a wave filtering unit, a differentiation unit, a control unit and an output unit. An input end of the wave filtering unit is connected with an oxygen sensor while an output end thereof is connected with one end of the differentiation unit. The other end of the differentiation unit is connected with the control unit. According to signals collected by the differentiation unit, the control unit controls the output unit to output failure information. The oxygen sensor failure monitoring device is directly installed on the oxygen sensor of a vehicle so as to be capable of real-time monitoring the status of the oxygen sensor.
Description
Technical field
The utility model relates to detection range, particularly a kind of fault monitoring device of lambda sensor.
Background technology
Along with developing of automobile industry, the problem of environmental pollution that vehicle exhaust brought is serious day by day.Therefore, Control of Automobile tail gas reduces its environmental pollution and has become one of current important research project effectively.Many automobiles are equipped with triple mode catalytic converter in engine exhaust system, to reduce exhaust emission.In case air-fuel ratio deviation theory air-fuel ratio (14.7:1), three-way catalyst be to CO, HC and NO
xDetergent power sharply descend.Detect the exhaust gas state that enters the three-element catalytic conversion equipment so lambda sensor is installed in gas outlet, according to the oxygen concentration determination air-fuel ratio in the exhaust, (ECU) sends feedback signal to electronic control unit, converges on theoretical value with the control air-fuel ratio.So in order to make the engine that the three-element catalytic conversion equipment is housed reach best exhaust purification performance, must be controlled at the air-fuel ratio of combination gas near the scope very narrow chemically correct fuel.Lambda sensor is to use requisite sensor on the three-element catalytic conversion equipment engine.
In the process that the lambda sensor that is provided with on the automobile is using, be easy to break down at present.But the vehicle user can not find timely when lambda sensor broke down, thereby caused the waste of fuel and the pollution of environment.
The existing method that detects lambda sensor generally is to pull up the wire harness plug of lambda sensor, the circuit diagram of contrast vehicle, draw a thin wire from the feedback voltage output wiring terminal of lambda sensor, insert good wire harness plug then, in engine running, the pointer type multimeter that use has lower range (being generally 2V) and a high impedance (internal resistance is greater than 10M Ω) is measured feedback voltage from the extension line, check that can the voltage table pointer swing back and forth, and writes down the number of times of the voltage table beat of pointer in the 10s between 0-1V.Under normal circumstances, along with the carrying out of FEEDBACK CONTROL, the feedback voltage of lambda sensor will constantly change up and down at 0.45V, and the change frequency of 10s internal feedback voltage should be no less than 8 times.If be less than 8 times, the lambda sensor existing problems are described then.
The number of oscillations that above-mentioned detection method needs vehicle to send into relevant detection mechanism manual observation voltage table pointer detects, and can not monitor lambda sensor in real time, thereby cause the waste of fuel and the pollution of environment easily.
The utility model content
In view of this, the purpose of this utility model is to provide a kind of lambda sensor fault monitoring device, can monitor the state of lambda sensor in real time.
For achieving the above object, the utility model is achieved in that
A kind of lambda sensor fault monitoring device comprises: filter unit, differentiation element, control module and output unit; The input end of filter unit is connected with lambda sensor, and its output terminal is connected with an end of differentiation element, and the other end of differentiation element is connected to control module, the signal that control module is gathered according to differentiation element, control output unit output failure message.
Further, this monitoring device also comprises shaping unit that is connected between differentiation element and the controller and the electric power management circuit that can produce the normal voltage signal, and electric power management circuit is sent to shaping unit and control module with above-mentioned voltage signal.
Because during the lambda sensor operate as normal, its output voltage constantly changes between certain scope, and lambda sensor reaches optimal operational condition by PID adjusting generation feedback signal with the control engine.Usually, its feedback signal changes more than 8 times in per 10 seconds during the lambda sensor operate as normal.If the lambda sensor output voltage changed slow or voltage remains unchanged, promptly feedback signal is less than 8 times in per 10 seconds or does not remain on noble potential or electronegative potential, shows that then there is fault in lambda sensor.
According to above-mentioned principle, radio-frequency component and noise signal in the signal that the utility model provides lambda sensor by filter unit filter out, change into pulse signal through the differentiation element signal that lambda sensor is mixed and disorderly again, receive the pulse signal that differentiation element provides and carry out timer counter by control module, the standard number that prestores in pulse signal quantity that count down to that will be in official hour and the control module compares, if less than standard number, show that then there is fault in lambda sensor, control module output failure message is given output unit, with convenient monitoring in real time.Than prior art, the utility model utilization is simple, less hardware resource is finished the real-time monitoring to lambda sensor, improved detection efficiency, and show the failure message of lambda sensor by output unit, in time prompting vehicle user changes the lambda sensor of fault, thereby has improved the utilization ratio of fuel and reduced pollution to environment.
Description of drawings
Fig. 1 is the utility model one embodiment circuit theory diagrams;
Fig. 2 is the circuit connection diagram of monitoring device of the present utility model and lambda sensor;
Fig. 3 is the circuit theory diagrams of the utility model second embodiment;
Fig. 4 is a circuit connection diagram embodiment illustrated in fig. 2;
Fig. 5 is an assembling synoptic diagram embodiment illustrated in fig. 4.
The realization of the purpose of this utility model, functional characteristics and advantage will be in conjunction with the embodiments, are described further with reference to accompanying drawing.
Embodiment
Referring to figs. 1 through Fig. 2, the utility model first embodiment is proposed, a kind of lambda sensor fault monitoring device 1 comprises filter unit 10, differentiation element 20, control module 30 and output unit 40; The input end of filter unit 10 is connected to lambda sensor 2 and is connected, and its output terminal is connected to the input end of differentiation element 20, and the output terminal of differentiation element 20 is connected to control module 30, and the output terminal of control module is connected with output unit 40.
HFS signal and noise signal from the feedback signal of lambda sensor 2 that filter unit 10 is used for receiving filter out; The filtering circuit that filter unit can adopt those skilled in the art to use always is low-pass filter in the present embodiment.Be fed through in the differentiating circuit 20 through the signal that filter unit 10 was handled, differentiating circuit 20 will change into pulse signal by filter unit 10 filtered lambda sensor feedback signals, and this signal sent into control module 30, the pulse signal that control module 30 reception differentiation elements 20 provide also carries out timer counter, the standard number that prestores in pulse signal quantity that count down to that will be in official hour and the control module 30 compares, if less than standard number, show that then there is fault in lambda sensor 2, control module 30 output failure messages are given output unit 40.Specifically, because lambda sensor changes more than 8 times in per 10 seconds.If the lambda sensor output voltage changed slow or voltage remains unchanged, promptly feedback signal is less than 8 times in per 10 seconds or does not remain on noble potential or electronegative potential, shows that then there is fault in lambda sensor.So it was 10 seconds that control module preestablishes the stipulated time, standard number is 8.When inside counting is arrived in 10 seconds square-wave signal number less than 8, judge that then there is fault in lambda sensor, produce output information to output unit 40.Output unit 40 can be to be one or more of LED, LCD MODULE or electronic control unit (ECU).Corresponding failure message can comprise one or more that be made up of light, sound, literal, pattern, reminding the vehicle user in time to safeguard or the replacing lambda sensor, thereby has improved the utilization ratio of fuel and has reduced pollution to environment.
Please refer to Fig. 4, the utility model second embodiment is based on a kind of lambda sensor fault monitoring device that first embodiment proposes, the feedback information that provides according to lambda sensor obtains the status information whether it exists fault, makes the vehicle user to monitor in real time, in time safeguards.
This oxygen fault monitoring device 1 comprises filter unit 10, differentiation element 20, control module 30 and output unit 40, shaping unit 50, electric power management circuit 60; The input end of filter unit 10 is connected to lambda sensor 2 and is connected, its output terminal is connected to the input end of differentiation element 20, the output terminal of differentiation element 20 is connected to the input end of shaping unit 40, another input end of shaping unit 50 is connected with electric power management circuit 60, the output terminal of shaping circuit 50 is connected to control module 30, and control module 30 output terminals are connected with output unit 40.
The effect of the filter unit 10 among the effect of filter unit 10, differentiation element 20, output unit 40 and first embodiment, differentiation element 20, output unit 40 is consistent, does not give unnecessary details once more.
Electric power management circuit 60 provides needed normal voltage signal for shaping unit 50.Shaping unit 50 receives the normal voltage signal from the pulse signal of differentiation element 20 outputs and electric power management circuit 60 outputs, thereby send into control module 30 after converting pulse signal to square-wave signal, 30 pairs of square-wave signals of control module carry out timer counter, the standard number that prestores in pulse signal quantity that count down to that will be in official hour and the control module 30 compares, if less than standard number, show that then there is fault in lambda sensor 2, control module 30 output failure messages are given output unit 40.
See also Fig. 4, Fig. 4 is the physical circuit figure of second embodiment.Deliver to the differentiating circuit 20 that constitutes by resistance R 2, R3, R8 and OP transport and placing device after feedback signal Vo that lambda sensor provides the filtering through the filter unit 10 that is composed in series by capacitor C 1, resistance R 1 and capacitor C 2.Wherein, the electrode input end ground connection of OP transport and placing device, negative input connects the end of resistance R 2, R8, the other end ground connection of resistance R 2, the other end of R8 is connected to the output terminal of OP transport and placing device, and the output terminal of OP transport and placing device also is connected with resistance R 3.Between the input end of diode D1 connection and resistance R 3 and Sheffer stroke gate U1, another input end of Sheffer stroke gate U1 is connected to the output terminal of OP transport and placing device.The output terminal of Sheffer stroke gate U1 is connected with the input end of the output terminal of electric power management circuit and not gate U2, is connected with resistance R 4 between the input end of not gate U2 and Sheffer stroke gate U1.Diode D1, Sheffer stroke gate U1, not gate U2 and resistance R 4 have constituted shaping unit 60, and the square-wave signal of the shaping unit of being sent by not gate U2 60 is delivered to control module 30.In the present embodiment, control module 30 is the single-chip microcomputer of 89C51 for model, and single-chip microcomputer carries out timer counter to the square-wave signal that receives.If the change frequency of square-wave signal in official hour is less than the stipulated number that is stored in advance in the single-chip microcomputer, illustrate that there is fault in lambda sensor, single-chip microcomputer can send failure message to lambda sensor malfunction indicator lamp LED and/or ECU, reminds the vehicle user need change lambda sensor by the light on and off of LED or other prompt modes of ECU; If the change frequency of square-wave signal in official hour illustrates the working properly of lambda sensor more than or equal to the number of times of regulation.Single-chip microcomputer does not send any signal.
In order to increase the reliability and stability of lambda sensor fault monitoring device of the present utility model, the single-chip microcomputer square-wave signal that adopts mean value method to handle to receive and according to this signal output failure message in the present embodiment.Specifically, single-chip microcomputer is not just to judge every 10s whether lambda sensor is normal, but is chronomere with 10s, averages every the square-wave signal number numerical value that counts on of 3～5 chronomeres.If mean value, assert promptly that lambda sensor breaks down less than 7.5, at this moment single-chip microcomputer produces output information and sends to lambda sensor malfunction indicator lamp LED and or ECU.
Because when automobile starting and end, the work of lambda sensor can take place unusually, so, the monitoring device of present embodiment is for improving the reliability of monitoring, within in incipient several seconds of automobile, by being set at single-chip microcomputer, corresponding timed sequence control monitoring device do not work, promptly in automobile starting arrives the time of lambda sensor operate as normal, this monitoring device is not judged the working condition of lambda sensor, but after treating the lambda sensor operate as normal (because of lambda sensor will reach certain temperature could operate as normal, lambda sensor is to time of the built-in heating arrangement intensification of vehicle exhaust and lambda sensor behind the car engine just time of operate as normal) just begin to monitor judgement.
It is outside or be integrated in lambda sensor inside and realize monitoring, alarming function to the lambda sensor fault that oxygen sensing fault monitoring device of the present utility model is directly installed on existing lambda sensor.See also Fig. 5, after each components and parts arranges on the circuit board of oxygen sensing fault monitoring device 1 of the present utility model, at its root coating last layer silica gel, to prevent causing the pin breakage of each components and parts owing to vehicle vibrations in the process of moving.Circuit board can be contained on the matrix of being made by lighter aluminium alloy of weight or magnesium alloy, the upper and lower both sides of circuit board are arranged and are gone up resistant to elevated temperatures rubber blanket, to reach the insulation of circuit board and matrix, to prevent that metal parts from touching circuit board and cause short circuit and prevent that extraneous water, wet goods from entering circuit board inside, cause effects such as circuit board short circuit or corrosion, by screw 100,100 ' matrix and cover plate are fixed at last, thereby this monitoring device is mounted to the outside of lambda sensor 2.
The above only is a preferred embodiment of the present utility model; be not so limit claim of the present utility model; every equivalent structure or equivalent flow process conversion that utilizes the utility model instructions and accompanying drawing content to be done; or directly or indirectly be used in other relevant technical fields, all in like manner be included in the scope of patent protection of the present utility model.
Claims (6)
1, a kind of lambda sensor fault monitoring device is characterized in that, this device comprises filter unit, differentiation element, control module and output unit; The input end of filter unit is connected with lambda sensor, and its output terminal is connected with an end of differentiation element, and the other end of differentiation element is connected to control module, the signal that control module is gathered according to differentiation element, control output unit output failure message.
2, monitoring device according to claim 1 is characterized in that, described output unit is light emitting diode and or electronic control unit.
3, monitoring device according to claim 2 is characterized in that, described failure message is one or more in light, sound, literal, the pattern.
4, monitoring device according to claim 3, it is characterized in that, described device also comprises shaping unit and can produce the electric power management circuit of normal voltage signal, shaping unit is connected between differentiation element and the controller, and electric power management circuit is sent to shaping unit and control module with above-mentioned voltage signal.
5, monitoring device according to claim 4 is characterized in that, described filter unit is a low-pass filter circuit.
6, monitoring device according to claim 5 is characterized in that, control module is preferably single-chip microcomputer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU200820212159XU CN201269862Y (en) | 2008-09-24 | 2008-09-24 | Failure monitoring apparatus for oxygen sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU200820212159XU CN201269862Y (en) | 2008-09-24 | 2008-09-24 | Failure monitoring apparatus for oxygen sensor |
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| CN201269862Y true CN201269862Y (en) | 2009-07-08 |
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| CNU200820212159XU Expired - Lifetime CN201269862Y (en) | 2008-09-24 | 2008-09-24 | Failure monitoring apparatus for oxygen sensor |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102343921A (en) * | 2011-06-21 | 2012-02-08 | 北京康拓红外技术股份有限公司 | On-line monitoring device for performances of wheel sensor and on-line monitoring method thereof |
| CN102495289A (en) * | 2011-12-08 | 2012-06-13 | 天津锐意泰克汽车电子有限公司 | Test circuit for internal resistance of oxygen sensor of automobile and method for measuring internal resistance of oxygen sensor of automobile |
| CN101644199B (en) * | 2009-09-02 | 2013-01-23 | 武汉理工大学 | Method and device for simulating faults of zirconia-type oxygen sensor for electronic injection engine |
| CN103775224A (en) * | 2012-10-19 | 2014-05-07 | 罗伯特·博世有限公司 | Method for detecting type of sensor or actuator connected to control unit or adapted for connection |
| CN105656447A (en) * | 2014-12-05 | 2016-06-08 | 王丽香 | Ultra-low frequency signal filtering-amplifying-shaping circuit |
| CN108375939A (en) * | 2018-03-30 | 2018-08-07 | 深圳春沐源控股有限公司 | Environment control method and device and computer readable storage medium |
| CN108508316A (en) * | 2017-02-28 | 2018-09-07 | 德尔福技术知识产权有限公司 | Short-circuit positioning device |
| CN109101011A (en) * | 2017-06-20 | 2018-12-28 | 百度在线网络技术（北京）有限公司 | Sensor monitoring method, device, equipment and the storage medium of automatic driving vehicle |
| CN115045770A (en) * | 2022-08-16 | 2022-09-13 | 中国科学院数学与系统科学研究院 | Quantitative filtering method of air-fuel ratio control system based on binary oxygen sensor |
-
2008
- 2008-09-24 CN CNU200820212159XU patent/CN201269862Y/en not_active Expired - Lifetime
Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101644199B (en) * | 2009-09-02 | 2013-01-23 | 武汉理工大学 | Method and device for simulating faults of zirconia-type oxygen sensor for electronic injection engine |
| CN102343921A (en) * | 2011-06-21 | 2012-02-08 | 北京康拓红外技术股份有限公司 | On-line monitoring device for performances of wheel sensor and on-line monitoring method thereof |
| CN102343921B (en) * | 2011-06-21 | 2013-07-24 | 北京康拓红外技术股份有限公司 | On-line monitoring device for performances of wheel sensor and on-line monitoring method thereof |
| CN102495289A (en) * | 2011-12-08 | 2012-06-13 | 天津锐意泰克汽车电子有限公司 | Test circuit for internal resistance of oxygen sensor of automobile and method for measuring internal resistance of oxygen sensor of automobile |
| CN102495289B (en) * | 2011-12-08 | 2013-08-07 | 天津锐意泰克汽车电子有限公司 | Test circuit for internal resistance of oxygen sensor of automobile and method for measuring internal resistance of oxygen sensor of automobile |
| CN103775224A (en) * | 2012-10-19 | 2014-05-07 | 罗伯特·博世有限公司 | Method for detecting type of sensor or actuator connected to control unit or adapted for connection |
| CN105656447A (en) * | 2014-12-05 | 2016-06-08 | 王丽香 | Ultra-low frequency signal filtering-amplifying-shaping circuit |
| CN108508316A (en) * | 2017-02-28 | 2018-09-07 | 德尔福技术知识产权有限公司 | Short-circuit positioning device |
| US10788541B2 (en) | 2017-02-28 | 2020-09-29 | Delphi Technologies Ip Limited | Method for pinpointing a short-circuit |
| CN109101011A (en) * | 2017-06-20 | 2018-12-28 | 百度在线网络技术（北京）有限公司 | Sensor monitoring method, device, equipment and the storage medium of automatic driving vehicle |
| US11453407B2 (en) | 2017-06-20 | 2022-09-27 | Apollo Intelligent Driving Technology (Beijing) Co., Ltd. | Method and apparatus of monitoring sensor of driverless vehicle, device and storage medium |
| CN108375939A (en) * | 2018-03-30 | 2018-08-07 | 深圳春沐源控股有限公司 | Environment control method and device and computer readable storage medium |
| CN115045770A (en) * | 2022-08-16 | 2022-09-13 | 中国科学院数学与系统科学研究院 | Quantitative filtering method of air-fuel ratio control system based on binary oxygen sensor |
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