CN101271042A - Software miss-fire generator - Google Patents
Software miss-fire generator Download PDFInfo
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- CN101271042A CN101271042A CNA2008100473300A CN200810047330A CN101271042A CN 101271042 A CN101271042 A CN 101271042A CN A2008100473300 A CNA2008100473300 A CN A2008100473300A CN 200810047330 A CN200810047330 A CN 200810047330A CN 101271042 A CN101271042 A CN 101271042A
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- misfire
- fire
- engine
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Abstract
A software misfire generator relates to an OBD misfire calibration test taken by an automotive engine. The prior external misfire generators are serially connected in an engine ignition line, which has the deficiencies of unstable control to the misfire rate, high cost and frequent manual operation in misfire rate setting. Therefore, the software misfire generator is provided, which includes an engine, a control unit, an ignition coil, a rotating speed sensor and a pressure sensor, and is characterized in that a misfire system is taken as a sub system in the engine control unit; the ignition coil is directly controlled to be disconnected and charged according to the misfire type and misfire rate set by the control unit, so as to obtain the required misfire rate; misfire at different misfire rate and of different misfire types can be produced by differently setting the misfire function switch, misfire rate and misfire type of three variables in the calibration software.
Description
Technical field
The present invention relates to the engine OBD software miss-fire generator that rating test uses that catches fire.
Background technology
Require automobile to carry out OBD according to national legislation and catch fire that (OBD English is On-Board Diagnostics to rating test in the development phase; Chinese is OBD) time; need simulate engine catches fire by certain fire loss ratio and (catches fire and give directions combustion engine owing to do not get angry; fuel metering is inaccurate; too low or other any reason of compression pressure; cause to burn in the cylinder); being determined at then to discharge under which kind of fire loss ratio transfinites value and damage ternary catalyzing unit under which kind of fire loss ratio; the limit value that the fire loss ratio of measuring is reported to the police as trouble light reduces the purpose that exhaust emissions is protected environment thereby reach then.Existing method is to make an external miss-fire generator, is serially connected in the engine ignition circuit, normal ignition signal is ended, thereby reach the purpose of catching fire, and this method has the shortcoming of three aspects: the one, to the control instability of fire loss ratio; The 2nd, the cost height is installed complexity, needs transform engine wiring harness; The 3rd, when being set, fire loss ratio needs frequent manual operation, more complicated.
Summary of the invention
The objective of the invention is in order to solve the shortcoming of above-mentioned external miss-fire generator, the special software miss-fire generator that proposes, technical scheme is: comprise engine, control module, ignition coil, speed probe, pressure transducer, it is characterized in that: this software miss-fire generator is a subsystem that will catch fire as control unit of engine, control module and engine, ignition coil, speed probe, pressure transducer connects, produce the engine load region of catching fire at needs, control module is according to catch fire type and not conducting of the direct control ignition coil of the fire loss ratio charging set, produce the fire loss ratio that needs, in calibration software to three variable MISFIRE_ENABLE (functional switch catches fire), MISFIRE_RATE (fire loss ratio), MISFIRE_TYPE (type of catching fire) carries out different settings, just can produce difference the catching fire of different fire loss ratios under the type of catching fire.
Beneficial effect:
Use this software miss-fire generator, only need in control module, add a subsystem and without any need for extra external equipment, do not need the engine ignition circuit is done any change yet, saved cost greatly, make the test engineer break away from frequent manual adjustments work, and the reliability of software miss-fire generator fire loss ratio is far above the miss-fire generator of external.
Description of drawings
Fig. 1 is a structural drawing of the present invention.
Fig. 2 is a logic block-diagram of the present invention.
Embodiment
As Fig. 1, shown in 2, this software miss-fire generator is to add in the control unit of engine as a subsystem catching fire, control module and engine, ignition coil, speed probe, pressure transducer connects, produce the engine load region (recording) of catching fire by speed probe and pressure transducer at needs, according to catch fire type and not conducting of the direct control ignition coil of the fire loss ratio charging set in the control module, produce the fire loss ratio that needs, in calibration software to three variable MISFIRE_ENABLE (functional switch catches fire), MISFIRE_RATE (fire loss ratio), MISFIRE_TYPE (type of catching fire) carries out different settings, just can produce difference the catching fire of different fire loss ratios under the type of catching fire.Specifically be provided with as follows:
1, do not need to produce when catching fire, MISFIRE_ENABLE is set to 0.
When 2, needs produced catching fire continuously of n%, MISFIRE_ENABLE was set to 1, MISFIRE_RATE=n, MISFIRE_TYPE=0.Wherein n is 1～10 integer.At this moment in per 100 igniting, will have continuously to misfire for n time.
When 3, the interval of needs generation n% caught fire, MISFIRE_ENABLE was set to 1, MISFIRE_RATE=n, MISFIRE_TYPE=1.Wherein n is 1～10 integer.At this moment after the subnormal igniting in every interval (100/n-1), have to misfire for 1 time.When 4, needs produced catching fire at random of n%, MISFIRE_ENABLE was set to 1, MISFIRE_RATE=n, MISFIRE_TYPE=2.Wherein n is 1～10 integer.At this moment in the per 100 subnormal igniting, will have to misfire at random for n time.
Claims (1)
- Software miss-fire generator, comprise engine, control module, ignition coil, speed probe, pressure transducer, it is characterized in that: this software miss-fire generator is to be core with the control module, to catch fire as a subsystem of control unit of engine, control module and engine, ignition coil, speed probe, pressure transducer connects, produce the engine load region of catching fire at needs, according to catch fire type and not conducting of the direct control ignition coil of the fire loss ratio control module charging set, produce the fire loss ratio that needs, in calibration software to three variablees functional switch that catches fire, fire loss ratio, the type of catching fire is carried out different settings, just can produce difference the catching fire of different fire loss ratios under the type of catching fire.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2008100473300A CN101271042A (en) | 2008-04-11 | 2008-04-11 | Software miss-fire generator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2008100473300A CN101271042A (en) | 2008-04-11 | 2008-04-11 | Software miss-fire generator |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101271042A true CN101271042A (en) | 2008-09-24 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA2008100473300A Pending CN101271042A (en) | 2008-04-11 | 2008-04-11 | Software miss-fire generator |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101271042A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101839807A (en) * | 2010-05-07 | 2010-09-22 | 北汽福田汽车股份有限公司 | On-fire detection device and method of multi-cylinder engine |
| CN102062687A (en) * | 2010-11-02 | 2011-05-18 | 清华大学 | Misfire generator for vehicle-mounted fault diagnosis |
| CN111366370A (en) * | 2020-04-15 | 2020-07-03 | 东风汽车集团有限公司 | Engine fault injection method and system |
| CN114961992A (en) * | 2021-07-22 | 2022-08-30 | 长城汽车股份有限公司 | Vehicle fault simulation method, storage medium, and vehicle |
-
2008
- 2008-04-11 CN CNA2008100473300A patent/CN101271042A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101839807A (en) * | 2010-05-07 | 2010-09-22 | 北汽福田汽车股份有限公司 | On-fire detection device and method of multi-cylinder engine |
| CN101839807B (en) * | 2010-05-07 | 2012-08-08 | 北汽福田汽车股份有限公司 | On-fire detection device and method of multi-cylinder engine |
| CN102062687A (en) * | 2010-11-02 | 2011-05-18 | 清华大学 | Misfire generator for vehicle-mounted fault diagnosis |
| CN102062687B (en) * | 2010-11-02 | 2012-09-05 | 清华大学 | Misfire generator for vehicle-mounted fault diagnosis |
| CN111366370A (en) * | 2020-04-15 | 2020-07-03 | 东风汽车集团有限公司 | Engine fault injection method and system |
| CN114961992A (en) * | 2021-07-22 | 2022-08-30 | 长城汽车股份有限公司 | Vehicle fault simulation method, storage medium, and vehicle |
| CN114961992B (en) * | 2021-07-22 | 2024-05-03 | 长城汽车股份有限公司 | Vehicle fault simulation method, storage medium and vehicle |
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| PB01 | Publication | ||
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| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Open date: 20080924 |