CN102998355B - A kind of method and system of engine off-line test discharged nitrous oxides - Google Patents
A kind of method and system of engine off-line test discharged nitrous oxides Download PDFInfo
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- CN102998355B CN102998355B CN201210550010.3A CN201210550010A CN102998355B CN 102998355 B CN102998355 B CN 102998355B CN 201210550010 A CN201210550010 A CN 201210550010A CN 102998355 B CN102998355 B CN 102998355B
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Abstract
The invention provides a kind of method and system of engine off-line test discharged nitrous oxides, wherein, method comprises: NOx sensor detects the tail gas that engine is discharged; The tail gas information that NOx sensor detects is uploaded to host computer with the form of message by CAN adapter; Host computer resolves described message, extracts tail gas information, calculates the content of NOx.Directly can receive the message that NOx sensor transmits, parse the content of NOx from message, structure is simple, and it is convenient to control, and carries out special control and data analysis, reduce the burden of ECU without ECU to NOx sensor.Owing to only using a NOx sensor and a CAN adapter, so compared with large-scale checkout equipment of the prior art, cost reduces a lot.And equipment volume is also little, like this when linearity test, only need sensor installation and CAN adapter on test-bed, do not need to improve test-bed.
Description
Technical field
The present invention relates to vehicular discharge detection technique field, particularly a kind of method and system of engine off-line test discharged nitrous oxides.
Background technology
In order to curb environmental pollution; various countries are according to the concrete condition of air environmental pollution; work out law and the air contaminant treatment target of relevant contexts protection; control overflow is proposed to the discharge of various pollution source; different emission standards is worked up for dissimilar motor vehicle; these standards are the mandatory execution of requirement, thus also referred to as Abgasgesetz.The target of automobile emission regulation guarantees that motor car engine is undertaken designing by clean standard and works.Regulation defines HC, CO, NOx(oxides of nitrogen in vehicle exhaust) and the discharge capacity of PM.Wherein NOx is main emission detections project, is also the difficult point in Tail gas measuring process.
Along with the raising of China's Abgasgesetz and the specific demand of outlet machine, in engine run process, demand is detected to the discharge of NOx more and more urgent, especially will carry out state four emission standard next year, NOx detects the required test item more will become under engine in line process.Present situation is each engine works detection schemes that all this project economic is not applicable.
China's heavy-duty car Abgasgesetz sees the following form:
In prior art, most checkout equipment all can not meet high temperature and the rugged surroundings requirement of engine exhaust detection, the mainly large-scale air checkout equipment that can meet the demands.But the small product size of large-scale air checkout equipment is large, complex structure, installation process are complicated, price is high, is unfavorable for applying.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of method and system of engine off-line test discharged nitrous oxides, and control is convenient, volume is little, and cost is low, is beneficial to and applies.
The embodiment of the present invention provides a kind of method of engine off-line test discharged nitrous oxides, comprising:
Nitrogen oxide NOx sensor detects the tail gas that engine is discharged;
The tail gas information that nitrogen oxide NOx sensor detects is uploaded to host computer with the form of message by CAN adapter;
Host computer resolves described message, extracts tail gas information, calculates the content of nitrogen oxide NOx.
Preferably, described nitrogen oxide NOx sensor also comprises before detecting the tail gas of engine exhaust port:
Received the activation message of host computer transmission by CAN adapter, in described activation message, carry initialization information;
Initialization is carried out according to described initialization information;
Send initialization to host computer after initialization completes and successfully feed back message.
Preferably, also comprise after the content of described calculating nitrogen oxide NOx:
The content of described nitrogen oxide NOx is converted to predetermined form show over the display.
Preferably, also comprise after the content of described calculating nitrogen oxide NOx:
The content of described nitrogen oxide NOx is converted to predetermined form and carries out the output of data record.
Preferably, described nitrogen oxide NOx sensor setting is in the exhaust ports of its Test Rig.
The embodiment of the present invention also provides a kind of system of engine off-line test discharged nitrous oxides, comprising: nitrogen oxide NOx sensor, CAN adapter and host computer;
Described nitrogen oxide NOx sensor, for detecting the tail gas that engine is discharged;
Described CAN adapter one end connects described nitrogen oxide NOx sensor, and the other end connects described host computer, for setting up CAN communication node, the tail gas information that described nitrogen oxide NOx sensor detects is sent to host computer with the form of message;
Described host computer, for resolving described message, extracting tail gas information, calculating the content of nitrogen oxide NOx.
Preferably, described nitrogen oxide NOx sensor, also for being received the activation message that host computer sends by CAN adapter, carries initialization information in described activation message; Initialization is carried out according to described initialization information; Send initialization to host computer after initialization completes and successfully feed back message.
Preferably, also display is comprised;
Described host computer, shows over the display for the content of described nitrogen oxide NOx is converted to predetermined form.
Preferably, described host computer, also carries out the output of data record for the content of described nitrogen oxide NOx being converted to predetermined form.
Preferably, described nitrogen oxide NOx sensor setting is in the exhaust ports of its Test Rig.
Compared with prior art, the present invention has the following advantages:
The method and system of the engine off-line test discharged nitrous oxides that the embodiment of the present invention provides, directly can receive the message that nitrogen oxide NOx sensor transmits, the content of nitrogen oxide NOx is parsed from message, structure is simple, it is convenient to control, without ECU, special control and data analysis are carried out to nitrogen oxide NOx sensor, thus reduce the burden of ECU.Owing to only using a nitrogen oxide NOx sensor and a CAN adapter, so compared with large-scale checkout equipment of the prior art, cost reduces a lot.And equipment volume is also little, like this when linearity test, only need sensor installation and CAN adapter on test-bed, do not need to improve test-bed.
Accompanying drawing explanation
Fig. 1 is embodiment of the method one process flow diagram of engine off-line test discharged nitrous oxides provided by the invention;
Fig. 2 is embodiment of the method two process flow diagram of engine off-line test discharged nitrous oxides provided by the invention;
Fig. 3 is system embodiment one structural drawing of engine off-line test discharged nitrous oxides provided by the invention;
Fig. 4 is system embodiment two structural drawing of engine off-line test discharged nitrous oxides provided by the invention.
Embodiment
For enabling above-mentioned purpose of the present invention, feature and advantage become apparent more, are described in detail the specific embodiment of the present invention below in conjunction with accompanying drawing.
It should be noted that, existing nitrogen oxide NOx sensor can not work alone, and must integrate, control nitrogen oxide NOx sensor by ECU with the ECU of engine.The burden of ECU work will be increased the weight of like this, and the nitrogen oxide NOx numerical value that ECU also cannot be tested shows.Be not suitable for using in the occasion of engine off-line test.
Therefore, the invention provides a kind of method of engine off-line test discharged nitrous oxides, be described in detail below in conjunction with accompanying drawing.
See Fig. 1, this figure is embodiment of the method one process flow diagram of engine off-line test discharged nitrous oxides provided by the invention.
The method of the engine off-line test discharged nitrous oxides that the present embodiment provides, comprising:
S101: nitrogen oxide NOx sensor detects the tail gas that engine is discharged;
Nitrogen oxide NOx sensor comprises: sensing unit and electronic control unit; Sensing unit is connected with electronic control unit by 600 ~ 900mm cable.Sensing unit in described nitrogen oxide NOx sensor can detect the concentration of the oxides of nitrogen in the tail gas that engine is discharged.
Wherein, the starting material of sensing unit are multilayer zirconia ceramics sensing elements.
Electrochemically the concentration of oxygen in each chamber of sensing element is calibrated in pump adjustment; Nitrous oxides concentration in motor exhaust makes it to decompose by applying electric current to electrochemically pump.
Physically based deformation mensuration, the electronic control unit of nitrogen oxide NOx sensor exports nitrous oxides concentration.
S102: the tail gas information that nitrogen oxide NOx sensor detects is uploaded to host computer with the form of message by CAN adapter;
It should be noted that, the length of message is eight bytes, and wherein, first character joint and second byte are the content of NOx.
Communicated by CAN between nitrogen oxide NOx sensor and host computer.
S103: host computer resolves described message, extracts tail gas information, calculates the content of nitrogen oxide NOx.
Because the first character joint in message and second byte are the content of NOx, so after host computer receives message, the first character in message is saved and second byte-extraction out, be merged into data, then convert the decimal system to by sexadecimal.
The method of the engine off-line test discharged nitrous oxides that the embodiment of the present invention provides, directly can receive the message that nitrogen oxide NOx sensor transmits, the content of nitrogen oxide NOx is parsed from message, structure is simple, it is convenient to control, without ECU, special control and data analysis are carried out to nitrogen oxide NOx sensor, thus reduce the burden of ECU.Owing to only using a nitrogen oxide NOx sensor and a CAN adapter, so compared with large-scale checkout equipment of the prior art, cost reduces a lot.And equipment volume is also little, like this when linearity test, only need sensor installation and CAN adapter on test-bed, do not need to improve test-bed.
It should be noted that, described nitrogen oxide NOx sensor setting is in the exhaust ports of its Test Rig.
See Fig. 2, this figure is embodiment of the method two process flow diagram of engine off-line test discharged nitrous oxides provided by the invention.
The method of the engine off-line test discharged nitrous oxides that the present embodiment provides, also comprises before detecting the tail gas of engine exhaust port at nitrogen oxide NOx sensor:
S201: the activation message being received host computer transmission by CAN adapter, carries initialization information in described activation message;
It should be noted that, activate message and comprise start detection program, complete the Function detection of nitrogen oxide NOx sensor, detect nitrogen oxide NOx sensor and whether can normally work.
S202: carry out initialization according to described initialization information.
Initialization has mainly comprised the initialization of CAN communication node, for follow-up normal transmission message is prepared.
S203: send initialization to host computer after initialization completes and successfully feed back message.
After host computer receives this feedback message, the follow-up message received again is exactly the message of the nitrogen oxide NOx of nitrogen oxide NOx sensor transmissions.
S204-S206 in the present embodiment is identical with the S101-S103 in embodiment one, does not repeat them here.
Can also comprise after the content of described calculating nitrogen oxide NOx:
S207: the content of described nitrogen oxide NOx is converted to predetermined form and shows over the display.
The concentration of nitrogen oxide NOx is shown over the display, testing staff can be made intuitively to understand the concentration of the nitrogen oxide NOx in current tail gas, thus real realization detects the concentration of the nitrogen oxide NOx in tail gas in real time.
Can also comprise after the content of described calculating nitrogen oxide NOx:
S208: the content of described nitrogen oxide NOx is converted to predetermined form and carries out the output of data record.
It should be noted that, S207 and S208 does not have tandem.
The method that the present embodiment provides, by setting up CAN communication node, using NOx sensor as a CAN communication node, host computer receives the message that this node transmits, by carrying out dissection process to message, extract the content of nitrogen oxide NOx, and then calculate the concentration of nitrogen oxide NOx, screen shows, the output of data record can be carried out simultaneously.
Based on the method for above-mentioned a kind of engine off-line test discharged nitrous oxides, present invention also offers a kind of system of engine off-line test discharged nitrous oxides, describe its ingredient in detail below in conjunction with specific embodiment.
See Fig. 3, this figure is system embodiment one structural drawing of engine off-line test discharged nitrous oxides provided by the invention.
The system of the engine off-line test discharged nitrous oxides that the present embodiment provides, comprising: nitrogen oxide NOx sensor 300, CAN adapter 400 and host computer 500;
Described nitrogen oxide NOx sensor 300, for detecting the tail gas that engine is discharged;
Nitrogen oxide NOx sensor comprises: sensing unit and electronic control unit; Sensing unit is connected with electronic control unit by 600 ~ 900mm cable.Sensing unit in described nitrogen oxide NOx sensor can detect the concentration of the oxides of nitrogen in the tail gas that engine is discharged.
Wherein, the starting material of sensing unit are multilayer zirconia ceramics sensing elements.
Electrochemically the concentration of oxygen in each chamber of sensing element is calibrated in pump adjustment; Nitrous oxides concentration in motor exhaust makes it to decompose by applying electric current to electrochemically pump.
Physically based deformation mensuration, the electronic control unit of nitrogen oxide NOx sensor exports nitrous oxides concentration.
Described CAN adapter 400 one end connects described nitrogen oxide NOx sensor 300, the other end connects described host computer 500, for setting up CAN communication node, the tail gas information that described nitrogen oxide NOx sensor 300 detects is sent to host computer 500 with the form of message;
It should be noted that, the length of message is eight bytes, and wherein, first character joint and second byte are the content of NOx.
Communicated by CAN between nitrogen oxide NOx sensor and host computer.
Described host computer 500, for resolving described message, extracting tail gas information, calculating the content of nitrogen oxide NOx.
Because the first character joint in message and second byte are the content of NOx, so after host computer receives message, the first character in message is saved and second byte-extraction out, be merged into data, then convert the decimal system to by sexadecimal.
The system of the engine off-line test discharged nitrous oxides that the embodiment of the present invention provides, host computer directly can receive the message of nitrogen oxide NOx sensor transmission by CAN adapter, the content of nitrogen oxide NOx is parsed from message, structure is simple, it is convenient to control, without ECU, special control and data analysis are carried out to nitrogen oxide NOx sensor, thus reduce the burden of ECU.Owing to only using a nitrogen oxide NOx sensor and a CAN adapter, so compared with large-scale checkout equipment of the prior art, cost reduces a lot.And equipment volume is also little, like this when linearity test, only need sensor installation and CAN adapter on test-bed, do not need to improve test-bed.
It should be noted that, described nitrogen oxide NOx sensor setting is in the exhaust ports of its Test Rig.
Described nitrogen oxide NOx sensor, also for being received the activation message that host computer sends by CAN adapter, carries initialization information in described activation message; Initialization is carried out according to described initialization information; Send initialization to host computer after initialization completes and successfully feed back message.
In another embodiment, see Fig. 4, this system also comprises display 600;
Described host computer 500, shows on display 600 for the content of described nitrogen oxide NOx is converted to predetermined form.
The concentration of nitrogen oxide NOx is shown over the display, testing staff can be made intuitively to understand the concentration of the nitrogen oxide NOx in current tail gas, thus real realization detects the concentration of the nitrogen oxide NOx in tail gas in real time.
Described host computer 500, also carries out the output of data record for the content of described nitrogen oxide NOx being converted to predetermined form.
Described nitrogen oxide NOx sensor setting is in the exhaust ports of its Test Rig.
The method that the present embodiment provides, by setting up CAN communication node, using NOx sensor as a CAN communication node, host computer receives the message that this node transmits, by carrying out dissection process to message, extract the content of nitrogen oxide NOx, and then calculate the concentration of nitrogen oxide NOx, screen shows, the output of data record can be carried out simultaneously.
The above is only preferred embodiment of the present invention, not does any pro forma restriction to the present invention.Although the present invention discloses as above with preferred embodiment, but and be not used to limit the present invention.Any those of ordinary skill in the art, do not departing under technical solution of the present invention ambit, the Method and Technology content of above-mentioned announcement all can be utilized to make many possible variations and modification to technical solution of the present invention, or be revised as the Equivalent embodiments of equivalent variations.Therefore, every content not departing from technical solution of the present invention, according to technical spirit of the present invention to any simple modification made for any of the above embodiments, equivalent variations and modification, all still belongs in the scope of technical solution of the present invention protection.
Claims (2)
1. a method for engine off-line test discharged nitrous oxides, is characterized in that, the method is used for engine works to the detection in line process under engine, and nitrogen oxide NOx sensor and CAN adapter are arranged on its Test Rig, and the method specifically comprises:
Described nitrogen oxide NOx sensor detects the tail gas that engine is discharged;
The tail gas information that described nitrogen oxide NOx sensor detects is uploaded to host computer with the form of message by described CAN adapter;
Described host computer resolves described message, extracts tail gas information, calculates the content of nitrogen oxide NOx;
Wherein, also comprise after the content of described calculating nitrogen oxide NOx:
The content of described nitrogen oxide NOx is converted to predetermined form show over the display;
Wherein, described nitrogen oxide NOx sensor setting is in the exhaust ports of its Test Rig;
Wherein, described nitrogen oxide NOx sensor also comprises before detecting the tail gas of engine exhaust port:
Received the activation message of host computer transmission by CAN adapter, in described activation message, carry initialization information;
Initialization is carried out according to described initialization information;
Send initialization to host computer after initialization completes and successfully feed back message;
Wherein, also comprise after the content of described calculating nitrogen oxide NOx:
The content of described nitrogen oxide NOx is converted to predetermined form and carries out the output of data record.
2. the system of an engine off-line test discharged nitrous oxides, it is characterized in that, this system is used for engine works to the detection in line process under engine, this system specifically comprises: nitrogen oxide NOx sensor, CAN adapter and host computer, wherein, nitrogen oxide NOx sensor and CAN adapter are arranged on its Test Rig;
Described nitrogen oxide NOx sensor, for detecting the tail gas that engine is discharged;
Described CAN adapter one end connects described nitrogen oxide NOx sensor, and the other end connects described host computer, for setting up CAN communication node, the tail gas information that described nitrogen oxide NOx sensor detects is sent to host computer with the form of message;
Described host computer, for resolving described message, extracting tail gas information, calculating the content of nitrogen oxide NOx;
Wherein, also display is comprised;
Described host computer, shows over the display for the content of described nitrogen oxide NOx is converted to predetermined form;
Wherein, described nitrogen oxide NOx sensor setting is in the exhaust ports of its Test Rig;
Wherein, described nitrogen oxide NOx sensor, also for being received the activation message that host computer sends by CAN adapter, carries initialization information in described activation message; Initialization is carried out according to described initialization information; Send initialization to host computer after initialization completes and successfully feed back message;
Wherein, described host computer, also carries out the output of data record for the content of described nitrogen oxide NOx being converted to predetermined form.
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| CN201210550010.3A CN102998355B (en) | 2012-12-17 | 2012-12-17 | A kind of method and system of engine off-line test discharged nitrous oxides |
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| CN102998355B true CN102998355B (en) | 2016-01-13 |
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| CN112412599B (en) * | 2020-11-18 | 2022-04-05 | 潍柴动力股份有限公司 | Upstream NOx sensor fault identification method and device, vehicle and storage medium |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1609420A (en) * | 2003-05-13 | 2005-04-27 | 赫多特普索化工设备公司 | Method of controlling and adding reducing agent to exhaust gas containing nitrogen oxide |
| CN202974937U (en) * | 2012-12-17 | 2013-06-05 | 潍柴动力股份有限公司 | Engine offline system for detecting nitrogen oxide emission |
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| US7581390B2 (en) * | 2006-04-26 | 2009-09-01 | Cummins Inc. | Method and system for improving sensor accuracy |
| US8370017B2 (en) * | 2009-07-13 | 2013-02-05 | Ford Global Technologies, Llc | Smart vehicle sensor |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1609420A (en) * | 2003-05-13 | 2005-04-27 | 赫多特普索化工设备公司 | Method of controlling and adding reducing agent to exhaust gas containing nitrogen oxide |
| CN202974937U (en) * | 2012-12-17 | 2013-06-05 | 潍柴动力股份有限公司 | Engine offline system for detecting nitrogen oxide emission |
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