CN201679544U - Fault diagnosis device for catalytic converter of engine - Google Patents

Fault diagnosis device for catalytic converter of engine Download PDF

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Publication number
CN201679544U
CN201679544U CN2010201679125U CN201020167912U CN201679544U CN 201679544 U CN201679544 U CN 201679544U CN 2010201679125 U CN2010201679125 U CN 2010201679125U CN 201020167912 U CN201020167912 U CN 201020167912U CN 201679544 U CN201679544 U CN 201679544U
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unit
catalytic converter
fuel ratio
air fuel
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CN2010201679125U
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Chinese (zh)
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姚国超
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IAT Automobile Technology Co Ltd
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IAT (CHINA) AUTO TECHNOLOGY Co Ltd
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/40—Engine management systems

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  • Testing Of Engines (AREA)
  • Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)

Abstract

The utility model provides a fault diagnosis device for a catalytic converter of an engine. The fault diagnosis device comprises an engine management unit, a catalytic converter aging fault diagnosis module and an OBD system management unit, wherein the engine management unit comprises an engine behavior input unit, a fuel oil closed-loop state control unit, an air-fuel ratio state control unit, a charcoal-canister electromagnetic valve control unit, an air-fuel ratio information input/output unit, an oxygen sensor signal input unit, a trouble light control unit and a serial port communication unit; and the catalytic converter aging fault diagnosis module comprises an enabling condition judgment part, an air-fuel ratio control and oxygen sensor information acquisition part and an oxygen storage time judgment part. The fault diagnosis device for the catalytic converter of the engine can judge the oxygen storage capability of the catalytic converter according to the engine behavior input parameter, so as to diagnose the aging fault of the catalytic converter.

Description

Motor catalytic converter failures diagnosis apparatus
Technical field
The utility model relates to motor catalytic converter failures diagnosis apparatus, particularly a kind of catalytic converter degradation failure deagnostic package that possesses On-Board Diagnostics (OBD) (OBD) function.
Background technique
In motor OBD system, the proper functioning of the catalytic converter that the needs assurance is connected with engine exhaust pipe, when catalytic converter causes performance degradation because of long-term the use, when causing hydrocarbon (HC) content in the discharging to surpass emission limit 0.4g/km, OBD system beacon should be lighted, and record trouble information.
Usually, the diagnosis to catalytic converter deteriorate is based on the oxygen storage capacity (OSC) that detects catalyst.As shown in Figure 1, when catalytic converter 10 was in normal working, the voltage output value of upstream oxygen sensor 261 is fluctuation up and down with the operating mode of motor, but the voltage output value of catalyst monitoring sensor 262 then is a straight line that voltage is close to zero substantially.
As shown in Figure 2, behind the performance degradation of catalytic converter 10, forfeiture oxygen storage capacity, catalyst monitoring sensor 262 also can produce the output voltage fluctuation that is similar to upstream oxygen sensor 261.Diagnosis to catalytic converter deteriorate can be surveyed the transformation efficiency at the catalyst converter converter by detecting the oxygen storage capacity of catalytic converter.
Summary of the invention
The purpose of this utility model provides a kind of motor catalytic converter failures diagnosis apparatus, and it can be according to the oxygen storage capacity of engine operating condition parameter decision catalytic converter, thereby the catalytic converter degradation failure of motor is diagnosed.
Another purpose of the present utility model provides a kind of by when air fuel ratio changes, relatively the upstream and downstream lambda sensor is to the response time of air fuel ratio variation, obtain the information of catalytic converter oxygen storage capacity, thereby the catalytic converter of motor is carried out the device of fault diagnosis.
The utility model provides a kind of motor catalytic converter failures diagnosis apparatus, and it comprises engine management unit, catalytic converter degradation failure diagnostic module and OBD System Management Unit.The engine management unit comprises engine operating condition input unit, fuel oil closed loop status unit, air fuel ratio status unit, air fuel ratio information I/O unit, Valve EGR control unit, lambda sensor information input unit, trouble light control unit and the serial communication module that links to each other with the OBD system.The aging diagnostic module of catalytic converter comprises and enables condition criterion part, air fuel ratio control and lambda sensor information gathering part and the storage oxygen time is judged part.Enabling the condition criterion part links to each other with engine operating condition input unit, fuel oil closed loop status unit, air fuel ratio input and output control unit and Valve EGR control unit; Air fuel ratio control links to each other with the lambda sensor information input unit with the air fuel ratio status unit with lambda sensor information gathering part; The storage oxygen time is judged part, and information gathering partly links to each other with lambda sensor with air fuel ratio control.The OBD System Management Unit judges that with the storage oxygen time trouble light control unit in part and the engine management unit links to each other.
In the another kind of schematically mode of execution of motor catalytic converter failures diagnosis apparatus, the lambda sensor information input signal derives from upstream oxygen sensor and catalyst monitoring sensor respectively.
In another schematic mode of execution of motor catalytic converter failures diagnosis apparatus, air fuel ratio control and lambda sensor information gathering partly comprise: phase I air fuel ratio control and lambda sensor information acquisition unit and control of second stage air fuel ratio and lambda sensor information acquisition unit.
In also a kind of schematic mode of execution of motor catalytic converter failures diagnosis apparatus, storage oxygen time detection unit branch comprises a storage oxygen time qualified unit, storage oxygen time calculating unit and one identifying unit as a result.
In another schematic mode of execution of motor catalytic converter failures diagnosis apparatus, the engine condition signal input comprises the signal of following sensor: suction pressure temperature transducer, throttle position sensor, cooling-water temperature sensor, catalytic converter temperature sensor, barometric pressure sensor and vehicle speed sensor.
Motor catalytic converter failures diagnosis apparatus of the present utility model is simple in structure, the reaction time is fast and fault judgement is accurate.
Description of drawings
The following drawings is only done the utility model and is schematically illustrated and explain, does not limit scope of the present utility model, wherein:
Fig. 1 is the output schematic representation of catalytic converter proper functioning upstream oxygen sensor and catalyst monitoring sensor;
Fig. 2 is the output schematic representation of upstream oxygen sensor and catalyst monitoring sensor after the catalytic converter deteriorate;
Fig. 3 is a kind of schematic structured flowchart of motor catalytic converter failures diagnosis apparatus;
Fig. 4 is the another kind of schematically structured flowchart of motor catalytic converter failures diagnosis apparatus.
Embodiment
Understand for technical characteristics, purpose and effect to model utility have more clearly, now contrast description of drawings embodiment of the present utility model, identical label is represented the part that structure is identical in each figure.
Motor catalytic converter failures diagnosis apparatus comprises that an engine management unit 20, aging diagnostic module 30 of catalytic converter that links to each other with engine management unit 20 are connected the OBD System Management Unit 40 of the aging diagnostic module 30 of catalytic converter and engine management unit 20 with one as shown in Figure 3.Clear for ease of drawing, engine management unit 20 has been divided into two parts in Fig. 3 and 4.
Engine management unit 20 comprises an engine operating condition input unit 21, fuel oil closed loop status unit 22, air fuel ratio status unit 23, Valve EGR control unit 24, air fuel ratio information I/O unit 25, lambda sensor information input unit 26, a trouble light control unit 27 and a serial communication module 28 that links to each other with in-circuit diagnostic system.
Wherein the sensor that links to each other with engine operating condition input unit 21 can comprise: suction pressure temperature transducer, throttle position sensor, cooling-water temperature sensor, catalytic converter temperature sensor, barometric pressure sensor and vehicle speed sensor etc.Valve EGR control unit 24 links to each other with Valve EGR, and Valve EGR is opened behind engine start, and activated carbon canister communicates with intake manifold, and fuel oil is inhaled into intake manifold and participates in burning after evaporated and purified.The lambda sensor that is arranged in the engine exhaust pipe is input to signal in the lambda sensor information input unit 26.Serial communication module 28 links to each other with OBD diagnostic module (not shown), the output control OBD fault indicating lamp of trouble light control unit 27.
The aging diagnostic module 30 of catalytic converter comprises: one enables condition criterion part 32, and it links to each other with engine operating condition input unit 21, fuel oil closed loop status unit 22, air fuel ratio status unit 23 and Valve EGR control unit 24; An air fuel ratio is controlled and lambda sensor information gathering part 34, and it links to each other with lambda sensor input unit 26 with air fuel ratio information I/O unit 25; Judge part 36 with a storage oxygen time that links to each other with lambda sensor information gathering part 34 with air fuel ratio control.
OBD System Management Unit 40 judges that with the storage oxygen time trouble light control unit 27 in part 36 and the engine management unit 20 links to each other.
In another schematic mode of execution of the described motor catalytic converter failures of Fig. 4 diagnosis apparatus, comprise that an engine management unit 20, aging diagnostic module 30 of catalytic converter that links to each other with engine management unit 20 are connected the OBD System Management Unit 40 of catalytic converter diagnostic module 30 and engine management unit 20 with one.The part that Fig. 4 is identical with label among Fig. 3 is represented same structure, so repeat no more.
Catalytic converter diagnostic module 30 comprises: one enables 32, one air fuel ratio controls of condition criterion part and lambda sensor information gathering part 34, judges part 36 with a storage oxygen time that links to each other with lambda sensor information gathering part 34 with air fuel ratio control.
Wherein air fuel ratio control and lambda sensor information gathering part 34 comprise: phase I air fuel ratio control and lambda sensor information acquisition unit 341 and control of second stage air fuel ratio and lambda sensor information acquisition unit 342, they link to each other with lambda sensor information input unit 26 with air fuel ratio information I/O unit 25 respectively.Phase I wherein is meant that air fuel ratio by the thinning stage of reference value, carries out the transition to 15.6 as air fuel ratio by 14.6 gradually; Second stage is meant the stage that air-fuel ratio thickens, as air fuel ratio by 15.6 transition 13.6 gradually.
The storage oxygen time judges that part 36 comprises: the time qualified unit of storage oxygen 361, storage oxygen time calculating unit 362 and one is identifying unit 363 as a result, the output of identifying unit as a result links to each other with OBD System Management Unit 40, and then links to each other with trouble light control unit 27.
In this article, " schematically " expression " is served as example, example or explanation ", any diagram, the mode of execution that is described to " schematically " in this article should be interpreted as a kind of preferred or have more the technological scheme of advantage.
Be to be understood that, though this specification is described according to each embodiment, but be not that each embodiment only comprises an independently technological scheme, this narrating mode of specification only is for clarity sake, those skilled in the art should make specification as a whole, technological scheme among each embodiment also can form other mode of executions that it will be appreciated by those skilled in the art that through appropriate combination.
Above listed a series of detailed description only is specifying at feasibility embodiment of the present utility model; they are not in order to limiting protection domain of the present utility model, allly do not break away from equivalent embodiment or the change that the utility model skill spirit done and all should be included within the protection domain of the present utility model.

Claims (5)

1. motor catalytic converter failures diagnosis apparatus, it comprises that an engine management unit (20), an aging diagnostic module (30) of the catalytic converter that links to each other with described engine management unit are connected the OBD System Management Unit (40) of aging diagnostic module of described catalytic converter and described engine management unit with one, is characterized in that:
Described engine management unit (20) comprising: an engine operating condition input unit (21), a fuel oil closed loop status unit (22), an air fuel ratio status unit (23), a Valve EGR control unit (24), an air fuel ratio information I/O unit (25), a lambda sensor information input unit (26), a trouble light control unit (27) and a serial communication module (28) that links to each other with in-circuit diagnostic system;
The described catalytic converter diagnostic module (30) that wears out comprising:
One enables condition criterion part (32), and it links to each other with described engine operating condition input unit (21), described fuel oil closed loop status unit (22), described air fuel ratio status unit (23) and Valve EGR control unit (24);
An air fuel ratio is controlled and lambda sensor information gathering part (34), and it links to each other with lambda sensor information input unit (26) with described air fuel ratio information I/O unit (25); With
A storage oxygen time that links to each other with lambda sensor information gathering part (34) with described air fuel ratio control is judged part (36);
Described OBD System Management Unit (40) judges that with the described storage oxygen time the described trouble light control unit (27) in part (36) and the described engine management unit (20) links to each other.
2. motor catalytic converter failures diagnosis apparatus as claimed in claim 1, wherein said lambda sensor information input unit (26) link to each other with catalyst monitoring sensor (262) with upstream oxygen sensor (261) respectively.
3. motor catalytic converter failures diagnosis apparatus as claimed in claim 2, wherein said air fuel ratio control and lambda sensor information gathering part (34) comprising: phase I air fuel ratio control and lambda sensor information acquisition unit (341) and control of second stage air fuel ratio and lambda sensor information acquisition unit (342).
4. motor catalytic converter failures diagnosis apparatus as claimed in claim 3, wherein said storage oxygen time judges that part (36) comprising: storage time qualified unit of oxygen (361), storage oxygen time calculating unit (362) and one is identifying unit (363) as a result.
5. motor catalytic converter failures diagnosis apparatus as claimed in claim 1, wherein the sensor that links to each other with described engine operating condition input unit (21) comprises: suction pressure temperature transducer, throttle position sensor, cooling-water temperature sensor, catalytic converter temperature sensor, barometric pressure sensor and vehicle speed sensor.
CN2010201679125U 2010-04-23 2010-04-23 Fault diagnosis device for catalytic converter of engine Expired - Fee Related CN201679544U (en)

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102606267A (en) * 2011-01-21 2012-07-25 通用汽车环球科技运作有限责任公司 On-board diagnostics system and method
CN102966419A (en) * 2011-08-30 2013-03-13 通用汽车环球科技运作有限责任公司 Systeme und verfahren zur einstellung der katalysatorsauerstoffspeicherkapazitat
CN109915268A (en) * 2017-12-12 2019-06-21 丰田自动车株式会社 Catalyst deterioration detecting apparatus
CN111997725A (en) * 2020-09-09 2020-11-27 东风汽车有限公司 Vehicle-mounted catalytic converter abnormity diagnosis and electronic equipment

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102606267A (en) * 2011-01-21 2012-07-25 通用汽车环球科技运作有限责任公司 On-board diagnostics system and method
CN102966419A (en) * 2011-08-30 2013-03-13 通用汽车环球科技运作有限责任公司 Systeme und verfahren zur einstellung der katalysatorsauerstoffspeicherkapazitat
CN102966419B (en) * 2011-08-30 2016-12-21 通用汽车环球科技运作有限责任公司 Catalyst oxygen storage capacity regulation system and method
CN109915268A (en) * 2017-12-12 2019-06-21 丰田自动车株式会社 Catalyst deterioration detecting apparatus
CN109915268B (en) * 2017-12-12 2021-10-15 丰田自动车株式会社 Catalyst degradation detection device
CN111997725A (en) * 2020-09-09 2020-11-27 东风汽车有限公司 Vehicle-mounted catalytic converter abnormity diagnosis and electronic equipment
CN111997725B (en) * 2020-09-09 2022-01-07 东风汽车有限公司 Vehicle-mounted catalytic converter abnormity diagnosis and electronic equipment

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PE01 Entry into force of the registration of the contract for pledge of patent right

Denomination of utility model: Fault diagnosis device for catalytic converter of engine

Effective date of registration: 20111114

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Pledgee: Pudong Development Bank of Shanghai, Limited by Share Ltd, Beijing branch

Pledgor: IAT (China) Auto Technology Co., Ltd.

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