CN101793604B - Oxygen sensor signal simulator - Google Patents
Oxygen sensor signal simulator Download PDFInfo
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- CN101793604B CN101793604B CN2010101088219A CN201010108821A CN101793604B CN 101793604 B CN101793604 B CN 101793604B CN 2010101088219 A CN2010101088219 A CN 2010101088219A CN 201010108821 A CN201010108821 A CN 201010108821A CN 101793604 B CN101793604 B CN 101793604B
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- 229910052760 oxygen Inorganic materials 0.000 title claims abstract description 75
- 239000001301 oxygen Substances 0.000 title claims abstract description 75
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 title claims abstract description 73
- 238000012545 processing Methods 0.000 claims abstract description 24
- 238000001914 filtration Methods 0.000 claims description 16
- 238000006243 chemical reaction Methods 0.000 claims description 8
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- 238000012360 testing method Methods 0.000 abstract description 4
- 238000010586 diagram Methods 0.000 description 6
- 238000012544 monitoring process Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000000446 fuel Substances 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 150000002926 oxygen Chemical class 0.000 description 2
- 238000004088 simulation Methods 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 206010027439 Metal poisoning Diseases 0.000 description 1
- 208000005374 Poisoning Diseases 0.000 description 1
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- 238000002679 ablation Methods 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
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- 231100000572 poisoning Toxicity 0.000 description 1
- 230000000607 poisoning effect Effects 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
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- Measuring Oxygen Concentration In Cells (AREA)
Abstract
The invention provides an oxygen sensor signal simulator, which comprises an input end, an A/D converter, a processor and a D/A converter, wherein the A/D converter is used for converting a normal oxygen sensor signal into a digital signal; the processor is used for processing the digital signal converted by the A/D converter according to pre-set or input control parameters so as to generate a fault signal of the oxygen sensor or not processing the digital signal to output the normal signal of the oxygen sensor; and the D/A converter is used for converting the output fault signal or normal signal of the oxygen sensor into an analogue signal and providing the analogue signal to ECU. The oxygen sensor signal simulator provided by an embodiment of the invention can simulate various conditions of failures and faults of the oxygen sensor by processing the normal oxygen sensor signal, in order to provide basis for test of the ECU.
Description
Technical field
The present invention relates to technical field of automotive electronics, particularly a kind of oxygen sensor signal simulator.
Background technology
OBD (online discharging diagnosis) technology is a kind of motor car engine automatic fault diagnosis program that grows up the eighties in 20th century, and it adopts unified standard and routine interface to help driver or maintenance personal to come the operation conditions and the tracing trouble of monitoring engine.At present, the state IV Abgasgesetz that the state III Abgasgesetz that implement the nationwide and Beijing implement all requires automotive control system to have the EOBD function.In EOBD, the oxygen sensor signal monitoring is its important function, lambda sensor, in order to detect the concentration of oxygen in the exhaust, and send feedback signal to ECU (engine electronic control unit), again by the increase and decrease of ECU control fuel injector distributive value, thereby the air-fuel ratio of combination gas is controlled near the theoretical value.Therefore every kind of ECU needs to carry out the matching and calibration of oxygen sensor signal, and whether the oxygen sensor signal monitoring function that detects ECU is normal, and therefore a kind of oxygen sensor signal simulator as engine calibration work need be provided.
Summary of the invention
Purpose of the present invention is intended to solve at least one of above-mentioned technological deficiency, and a kind of oxygen sensor signal simulator as engine calibration work particularly is provided.
For achieving the above object, one aspect of the present invention proposes a kind of oxygen sensor signal simulator, comprising: input end, by the normal signal of described input end input lambda sensor; A/D converter is used for described normal oxygen sensor signal is converted to digital signal; Processor is handled the digital signal of described A/D converter conversion according to controlled variable default or input, generates the fault-signal of lambda sensor, perhaps described digital signal is not handled, and exports the normal signal of described lambda sensor; D/A converter is used for the fault-signal or the normal signal of the described lambda sensor of described processor output are converted to simulating signal, and offers electronic control unit ECU.
As one embodiment of the present of invention, also comprise: whether the signal Processing selector switch is used to control described processor and the digital signal of described A/D converter conversion is handled.
As one embodiment of the present of invention, also comprise: the mode of operation selector switch is used for according to selecting described oxygen sensor signal simulator to enter overgauge pattern, minus deviation pattern or filter patterns.
As one embodiment of the present of invention, under the described overgauge pattern, described processor comprises the processing of described digital signal: the fault-signal=supplied with digital signal of output * decay factor+deviate; Under the described minus deviation pattern, described processor comprises the processing of described digital signal: the fault-signal=supplied with digital signal of output * decay factor-deviate; Under the described filter patterns, described processor comprises the processing of described digital signal: judge that described supplied with digital signal is in ascent stage and still is in the decline stage; Be in ascent stage if judge described supplied with digital signal, then adopt positive filtering factor to select positive filter value to handle; Be in the decline stage if judge described supplied with digital signal, then adopt negative filtering factor to select negative filter value to handle.Particularly, the positive filtering factor of described employing is selected positive filter value to handle to comprise: fault-signal * (the positive filter value of the 1-)+input signal of the fault-signal of output=output last time * positive filter value; The negative filter value of the negative filtering factor selection of described employing is handled and is comprised: fault-signal * (1-bears the filter value)+input signal of the fault-signal of output=output last time * negative filter value.
As one embodiment of the present of invention, also comprise the parameter input equipment, be used to make the user that the controlled variable of described processor is set by described parameter input equipment.
As one embodiment of the present of invention, also comprise: working station indicator is used for opening to indicate the state of described oxygen sensor signal simulator when described oxygen sensor signal simulator operate as normal.
As one embodiment of the present of invention, also comprise: drag switch on the internal resistance is used for according to the difference of lambda sensor type the normal signal of the lambda sensor of input being carried out drawing.
As one embodiment of the present of invention, the normal signal of the lambda sensor of described input is provided by the lambda sensor in the car, and described oxygen sensor signal simulator is connected between described the car interior lambda sensor and ECU.Wherein, also comprise respectively with described car in the wire harness interface that links to each other with ECU of lambda sensor.
The oxygen sensor signal simulator that the embodiment of the invention proposes can be simulated the various inefficacies and the failure condition of lambda sensor by the processing to normal oxygen sensor signal, thereby provides foundation for the test of ECU.In addition, the oxygen sensor signal simulator of the embodiment of the invention has advanced signal processing algorithm, can simulate the various inefficacies and the failure condition of lambda sensor, reliable operation, and processing speed is fast.Secondly, in embodiments of the present invention, oxygen sensor signal simulator can have input-output device such as keyboard, display screen, thereby the user can utilize input equipment setup parameters such as keyboard, and is shown to the user by display screen, and is user-friendly.
Aspect that the present invention adds and advantage part in the following description provide, and part will become obviously from the following description, or recognize by practice of the present invention.
Description of drawings
Above-mentioned and/or additional aspect of the present invention and advantage are from obviously and easily understanding becoming the description of embodiment below in conjunction with accompanying drawing, wherein:
Fig. 1 is the synoptic diagram of the oxygen sensor signal simulator of the embodiment of the invention one;
Fig. 2 is the oxygen sensor signal simulator of the embodiment of the invention one and the connection diagram between lambda sensor and the ECU;
Fig. 3 is the synoptic diagram of the oxygen sensor signal simulator of the embodiment of the invention two;
Fig. 4 is the outside drawing of the oxygen sensor signal simulator of the embodiment of the invention two.
Embodiment
Describe embodiments of the invention below in detail, the example of described embodiment is shown in the drawings, and wherein identical from start to finish or similar label is represented identical or similar elements or the element with identical or similar functions.Below by the embodiment that is described with reference to the drawings is exemplary, only is used to explain the present invention, and can not be interpreted as limitation of the present invention.
The present invention mainly is, by the processing of oxygen sensor signal simulator to normal oxygen sensor signal, can simulate the fault-signal of lambda sensor, for example owing to loose contact, disturbed by other signals or signal skew that lambda sensor inefficacy etc. produces etc., the oxygen sensor signal simulator that provides by the embodiment of the invention just can be simulated the various inefficacies and the failure condition of lambda sensor like this, thereby provides foundation for the test of ECU.
Embodiment one,
As shown in Figure 1; synoptic diagram for the oxygen sensor signal simulator of the embodiment of the invention one; the basic structure of oxygen sensor signal simulator has been described among this embodiment; those skilled in the art can expand with the realization more function according to this structure, but these expansions all should be included within protection scope of the present invention.As shown in Figure 1, this oxygen sensor signal simulator comprises input end, can be by the normal signal of this input end input lambda sensor, in one embodiment of the invention, the normal signal of lambda sensor can be produced by the lambda sensor that carries in the car, as oxygen sensor signal simulator of the present invention is connected between lambda sensor and the ECU, as shown in Figure 2, be the oxygen sensor signal simulator of the embodiment of the invention one and the connection diagram between lambda sensor and the ECU, therefore correspondingly oxygen sensor signal simulator also have respectively with described car in the wire harness interface that links to each other with ECU of lambda sensor, the power supply of oxygen sensor signal simulator and power supply ground can adopt power supply and the power supply ground that ECU uses in addition, and oxygen sensor signal simulator also can use the 12V power supply on the car certainly.
This oxygen sensor signal simulator also comprises A/D converter 100, processor 200 and D/A converter 300.A/D converter 100 is used for normal oxygen sensor signal is converted to digital signal.Processor 200 is handled the digital signal of A/D converter conversion according to default controlled variable, generates the fault-signal of lambda sensor, perhaps described digital signal is not handled the normal signal of output lambda sensor.For example can decay to normal oxygen sensor signal, processing such as delay, thereby simulation is because the fault-signals such as signal skew that the lambda sensor inefficacy causes.D/A converter 300 is used for the fault-signal or the normal signal of the lambda sensor of processor 200 outputs are converted to simulating signal, and offers ECU.In one embodiment of the invention, processor 200 can be selected single-chip microcomputer, high-speed microprocessor MC9S08GT32 for example, A/D converter 100 and D/A converter 300 should also possess certain precision and speed simultaneously, for example A/D converter 100 can be MAX1236, and D/A converter 300 can be MAX5822.
Embodiment two,
With respect to embodiment one, present embodiment has more function, and those skilled in the art also can make more expansion on the basis of embodiment two certainly, so these function expansions also should be included within protection scope of the present invention.As shown in Figure 3, be the synoptic diagram of the oxygen sensor signal simulator of the embodiment of the invention two.In this embodiment, comprise the A/D converter 100 shown in the embodiment one, processor 200 and D/A converter 300, its function and connected mode are identical with embodiment one, do not repeat them here.
In one embodiment of the invention, oxygen sensor signal simulator also comprises parameter input equipment 400, as keyboard, and touch-screen etc., be used to make the user to pass through the controlled variable of parameter input equipment 400 set handling devices 200, parameters such as decay factor, deviate for example are set.
In one embodiment of the invention, oxygen sensor signal simulator also comprises signal Processing selector switch 500, be used for processor controls 200 and whether the digital signal of A/D converter 100 conversions handled, be i.e. the normal signal of processor controls 200 output fault-signals or lambda sensor.As shown in Figure 4, outside drawing for the oxygen sensor signal simulator of the embodiment of the invention two, if for example signal Processing selector switch 500 is in the position of " holding signal ", then the normal signal of the lambda sensor of 200 pairs of inputs of processor is not done any processing, is directly inputted among the ECU; If signal Processing selector switch 500 is in the position of " signal Processing ", then the normal signal of the lambda sensor of 200 pairs of inputs of processor is handled according to the parameter that is provided with, and generates fault-signal and offers ECU.
In one embodiment of the invention, oxygen sensor signal simulator also comprises mode of operation selector switch 600, three kinds of mode of operations are provided for processor 200 in embodiments of the present invention, every kind of mode of operation is all corresponding to one or more failure conditions, and have different separately parameters, the user also can be provided with these parameters according to parameter input equipment 400 after selecting mode of operation.In embodiments of the present invention, these three kinds of mode of operations comprise: overgauge pattern, minus deviation pattern or filter patterns.Wherein, the failure condition of overgauge pattern correspondence is: the loose contact of sensor ground wire, sensor signal lines and other signal wire or power lead short circuit; The failure condition of minus deviation pattern correspondence is: sensor power supply line loose contact, sensor signal lines and other signal wire or earth short; The failure condition of filter patterns correspondence is: the sensor signal lines loose contact, the output voltage that causes because of factors such as saturnism, silicon poisoning, surperficial carbon deposit, ceramic component breakage, heating resistor ablations is undesired and it is slow to respond.
For the overgauge pattern, processor 200 is decayed according to the decay factor of setting earlier for the digital signal through A/D converter 100 conversions, adds departure afterwards, and exports to ECU by D/A converter 300.Wherein: the fault-signal=supplied with digital signal of output * decay factor+deviate, the scope of decay factor are 0-0.999, and the scope of deviate is 0-999mv.
For the minus deviation pattern, processor 200 is decayed according to the decay factor of setting earlier for the digital signal through A/D converter 100 conversions, deducts departure afterwards again, and exports to ECU by D/A converter 300.Wherein:
Fault-signal=supplied with digital signal * decay factor-the deviate of output, the scope of decay factor is 0-0.999, the scope of deviate is 0-999mv.
For filter patterns, this pattern is mainly simulated the slack-off phenomenon of oxygen sensor signal.Need judge at first that supplied with digital signal is in ascent stage and still is in the decline stage,,, then use negative filtering factor if be in the decline stage if be in ascent stage then use positive filtering factor.When filtering factor was 999, filtering was inoperative substantially.When filtering factor hour, then filter effect is bigger.According to the filtering factor of setting, corresponding filter value is chosen in generator inside, both positive change.Particularly, adopt positive filtering factor to select positive filter value to handle and comprise: fault-signal * (the positive filter value of the 1-)+input signal of the fault-signal of output=output last time * positive filter value, wherein the scope of positive filter value is 0-0.999; Adopting negative filtering factor to select negative filter value to handle comprises: fault-signal * (1-bears the filter value)+input signal of the fault-signal of output=output last time * negative filter value, wherein the scope of negative filter value is 0-0.999, wherein, negative filter value is identical with the scope of positive filter value, acts on waveform ascent stage and waveform decline stage respectively.
In another embodiment of the present invention, oxygen sensor signal simulator also comprises working station indicator, is used for opening when the oxygen sensor signal simulator operate as normal state with the indication oxygen sensor signal simulator.
In another embodiment of the present invention, oxygen sensor signal simulator also comprises drag switch 700 on the internal resistance, is used for according to the difference of lambda sensor type the normal signal of the lambda sensor of input being carried out drawing, and for example pull-up resistor is 487K Ω.The reason of drawing on the needs is: former ECU system itself can provide the pump electric current to lambda sensor, is added on the high and signal low circuit of the signal of lambda sensor.In order to connect oxygen sensor signal simulator, the signal height of lambda sensor is cut off and is linked in the simulator, therefore the pump electric current of lambda sensor also is cut off, and need offer lambda sensor pump electric current in addition, and the effect of pump electric current is in order to guarantee the cleaning of gas in the lambda sensor contrast chamber.
When using the oxygen sensor signal simulator of the embodiment of the invention, oxygen sensor signal simulator need be able to be placed in the pilothouse, use by special demarcation personnel operation, by the fault-signal of oxygen sensor signal simulator simulation ECU is tested.
The oxygen sensor signal simulator that the embodiment of the invention proposes can be simulated the various inefficacies and the failure condition of lambda sensor by the processing to normal oxygen sensor signal, thereby provides foundation for the test of ECU.In addition, the oxygen sensor signal simulator of the embodiment of the invention has advanced signal processing algorithm, can simulate the various inefficacies and the failure condition of lambda sensor, reliable operation, and processing speed is fast.Secondly, in embodiments of the present invention, oxygen sensor signal simulator can have input-output device such as keyboard, display screen, thereby the user can utilize input equipment setup parameters such as keyboard, and is shown to the user by display screen, and is user-friendly.
Although illustrated and described embodiments of the invention, for the ordinary skill in the art, be appreciated that without departing from the principles and spirit of the present invention and can carry out multiple variation, modification, replacement and modification that scope of the present invention is by claims and be equal to and limit to these embodiment.
Claims (7)
1. an oxygen sensor signal simulator is characterized in that, comprising:
Input end is by the normal signal of described input end input lambda sensor;
A/D converter is used for described normal oxygen sensor signal is converted to digital signal;
Processor is used for according to controlled variable default or input the digital signal of described A/D converter conversion being handled, and generates the fault-signal of lambda sensor, perhaps described digital signal is not handled, and exports the normal signal of described lambda sensor;
D/A converter is used for the fault-signal or the normal signal of the described lambda sensor of described processor output are converted to simulating signal, and offers electronic control unit ECU,
The mode of operation selector switch is used to select described oxygen sensor signal simulator to enter overgauge pattern, minus deviation pattern or filter patterns,
Wherein, under the described overgauge pattern, described processor comprises the processing of described digital signal: the fault-signal=supplied with digital signal of output * decay factor+deviate;
Wherein, under the described minus deviation pattern, described processor comprises the processing of described digital signal: the fault-signal=supplied with digital signal of output * decay factor-deviate; Under the described filter patterns, described processor comprises the processing of described digital signal: judge that described supplied with digital signal is in ascent stage and still is in the decline stage, be in ascent stage if judge described supplied with digital signal, then adopt positive filtering factor to select positive filter value to handle, be in the decline stage if judge described supplied with digital signal, then adopt negative filtering factor to select negative filter value to handle;
Wherein, the positive filtering factor of described employing is selected positive filter value to handle to comprise: fault-signal * (the positive filter value of the 1-)+input signal of the fault-signal of output=output last time * positive filter value;
Wherein, the negative filter value of the negative filtering factor selection of described employing is handled and is comprised: fault-signal * (1-bears the filter value)+input signal of the fault-signal of output=output last time * negative filter value.
2. oxygen sensor signal simulator as claimed in claim 1 is characterized in that, also comprises:
Whether the signal Processing selector switch is used to control described processor and the digital signal of described A/D converter conversion is handled.
3. oxygen sensor signal simulator as claimed in claim 1 or 2 is characterized in that, also comprises the parameter input equipment, is used to make the user that the controlled variable of described processor is set by described parameter input equipment.
4. oxygen sensor signal simulator as claimed in claim 1 is characterized in that, also comprises:
Working station indicator is used for opening to indicate the state of described oxygen sensor signal simulator when described oxygen sensor signal simulator operate as normal.
5. oxygen sensor signal simulator as claimed in claim 1 is characterized in that, also comprises:
Drag switch on the internal resistance is used for according to the difference of lambda sensor type the normal signal of the lambda sensor of input being carried out drawing.
6. oxygen sensor signal simulator as claimed in claim 1 is characterized in that the normal signal of the lambda sensor of described input is provided by the lambda sensor in the car, and described oxygen sensor signal simulator is connected between described the car interior lambda sensor and ECU.
7. oxygen sensor signal simulator as claimed in claim 6 is characterized in that, also comprises:
Respectively with described car in the wire harness interface that links to each other with ECU of lambda sensor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN2010101088219A CN101793604B (en) | 2010-02-08 | 2010-02-08 | Oxygen sensor signal simulator |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2010101088219A CN101793604B (en) | 2010-02-08 | 2010-02-08 | Oxygen sensor signal simulator |
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| CN101793604A CN101793604A (en) | 2010-08-04 |
| CN101793604B true CN101793604B (en) | 2011-11-30 |
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Families Citing this family (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102411311B (en) * | 2011-08-23 | 2014-10-08 | 意昂神州（北京）科技有限公司 | Oxygen sensor failure simulator and oxygen sensor failure simulation method |
| DE102012213068A1 (en) | 2012-07-25 | 2014-01-30 | Robert Bosch Gmbh | Method and fault simulator for checking the fault detection of a control unit |
| CN104977920B (en) * | 2014-04-04 | 2017-09-26 | 联创汽车电子有限公司 | Broad domain oxygen sensor loads simulator |
| DE102016124328A1 (en) | 2016-12-14 | 2018-06-14 | Dspace Digital Signal Processing And Control Engineering Gmbh | Test rig for simulating the electrical response of a broadband lambda probe |
| CN110273771B (en) * | 2018-03-14 | 2022-01-04 | 十堰科纳汽车电子股份有限公司 | Air-fuel ratio deviation device and method |
| CN109932604A (en) * | 2019-04-03 | 2019-06-25 | 武汉菱电汽车电控系统股份有限公司 | Wide oxygen failure simulation method, apparatus and system |
| CN110131464A (en) * | 2019-05-08 | 2019-08-16 | 福建洁博利厨卫科技有限公司 | A kind of inductive tap discharging device |
| CN111351901B (en) * | 2020-04-02 | 2022-11-04 | 昆易电子科技(上海)有限公司 | Sensor special working condition simulation device |
| CN113189273A (en) * | 2021-04-27 | 2021-07-30 | 潍柴动力股份有限公司 | Equipment and method for simulating faults of nitrogen-oxygen sensor |
| CN117192179A (en) * | 2023-10-05 | 2023-12-08 | 江阴信邦电子有限公司 | Simulation system of wide-range oxygen sensor and simulation method of wide-range oxygen signal |
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