CN101245739A - Sensor activation monitor - Google Patents

Sensor activation monitor Download PDF

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Publication number
CN101245739A
CN101245739A CN 200810008232 CN200810008232A CN101245739A CN 101245739 A CN101245739 A CN 101245739A CN 200810008232 CN200810008232 CN 200810008232 CN 200810008232 A CN200810008232 A CN 200810008232A CN 101245739 A CN101245739 A CN 101245739A
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CN
China
Prior art keywords
sensor
period
starting
certain level
value
Prior art date
Application number
CN 200810008232
Other languages
Chinese (zh)
Other versions
CN101245739B (en
Inventor
安德斯·恩格尔
彼得斯·斯梅德
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福特全球技术公司
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Priority to EP07102404.6 priority Critical
Priority to EP20070102404 priority patent/EP1959121B1/en
Application filed by 福特全球技术公司 filed Critical 福特全球技术公司
Publication of CN101245739A publication Critical patent/CN101245739A/en
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Publication of CN101245739B publication Critical patent/CN101245739B/en

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Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02DCONTROLLING COMBUSTION ENGINES
    • F02D41/00Electrical control of supply of combustible mixture or its constituents
    • F02D41/02Circuit arrangements for generating control signals
    • F02D41/14Introducing closed-loop corrections
    • F02D41/1438Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor
    • F02D41/1493Details
    • F02D41/1495Detection of abnormalities in the air/fuel ratio feedback system
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02DCONTROLLING COMBUSTION ENGINES
    • F02D41/00Electrical control of supply of combustible mixture or its constituents
    • F02D41/02Circuit arrangements for generating control signals
    • F02D41/14Introducing closed-loop corrections
    • F02D41/1438Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor
    • F02D41/1444Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor characterised by the characteristics of the combustion gases
    • F02D41/1454Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor characterised by the characteristics of the combustion gases the characteristics being an oxygen content or concentration or the air-fuel ratio
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02DCONTROLLING COMBUSTION ENGINES
    • F02D41/00Electrical control of supply of combustible mixture or its constituents
    • F02D41/02Circuit arrangements for generating control signals
    • F02D41/14Introducing closed-loop corrections
    • F02D41/1438Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor
    • F02D41/1473Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor characterised by the regulation method
    • F02D41/1474Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor characterised by the regulation method by detecting the commutation time of the sensor

Abstract

The present invention relates to a method and on-board diagnostic system for verifying timely activation of a heated exhaust gas binary oxygen sensor arranged in an exhaust after-treatment system of a vehicle following start-up of an associated internal combustion engine. It is determined if entry conditions are met. Changes in an electrical signal output by the sensor are detected. A maximum value of the signal is detected. The detected signal changes are accumulated. It is determined if the accumulation is above a predetermined threshold within a first time period following start-up. It is determined if the maximum value is above a predetermined reference value within a second time period following start-up. If at least one of the determinations is positive, a functioning sensor is indicated and if both determinations are negative, a malfunctioning sensor is indicated.

Description

Sensor activation monitor

Technical field

The present invention relates to a kind of method, according to the preamble of claim 1, this method is used for checking the timely activation of the hot waste gas dioxygen sensor (binary oxygen sensor) that is placed in the vehicle exhaust after-treatment system after related internal combustion engine starts.

The invention still further relates to a kind of onboard diagnostic system, according to the preamble of claim 6, this system is used for checking the timely activation of the hot waste gas dioxygen sensor that is placed in the vehicle exhaust after-treatment system after related internal combustion engine starts.

Background technique

In having the motor vehicle of internal-combustion engine, emission control is just becoming the problem that becomes more and more important.Sensor in relevant exhaust after-treatment cleaning system is used to check the appropriate operation of exhausted gas post-processing system and for engine management system provides input, discharges to reduce so that operate correlation engine in a kind of suitable mode.Habitual a kind of like this sensor is so-called dioxygen sensor.

The dioxygen sensor must have certain temperature with proper functioning.An old or out of order sensor may not in time be activated after engine start, but just may be activated after the period longer than normal condition, causes undesirable discharging.The dioxygen sensor can also comprise a sensor heater, is used for heating sensor so that make it arrive its operating temperature quickly.Similarly, an old or out of order sensor heater can cause undesirable discharging.

In the monitoring exhaust after-treatment cleaning system some of lambda sensor previous make great efforts based on utilize to the noiseless monitoring of sensor output voltage and add with the specific period on voltage trace sections, with these data and threshold value contrast, determine whether sensor reaches its execution and require standard.

A kind of such previous effort is carried out explanation in the patent No. is the patent of US 5 801 295, a kind of On-Board Diagnostics (OBD) test to hot exhaust gas oxygen sensor wherein has been described, it comprise the output of respond to lambda sensor and add with the specific period on output with the length of definite sensor voltage trace relative time.This Length Indication sensor activity of given period.These data and threshold value are compared to determine whether the waste gas lambda sensor reaches definite execution requirement.

Yet the patent No. that is to say for the patent of US 5 801 295 provides in normal working, when motor operating temperature and during its works fine to the monitoring of hot exhaust gas oxygen sensor.Inversion frequency is used as the index of transducer sensitivity, intensity and service life.The patent No. is that the patent of US 5 801 295 is not provided at the monitoring that engine start in time activates sensor afterwards.

Summary of the invention

An object of the present invention is to provide a kind of improved method, be used for after related internal combustion engine starts, checking the timely activation of the hot waste gas dioxygen sensor that is placed in the vehicle exhaust after-treatment system, can detect out of order sensor by this method, so just can eliminate or reduce at least the risk of undesirable discharging.

According to a first aspect of the invention, this purpose reaches according to the characteristic of claim 1, and it specifically comprises following steps: determine whether to meet starting condition; The variation of the electrical signal output of acquisition sensor; Survey the maximum value of this signal; The signal that accumulation detects changes; Determine to accumulate in first period after starting whether on predetermined threshold; Determine in second period after starting that maximum value is whether on predetermined reference value; If at least one was that sure just expression is the sensor of proper functioning during these were judged, if two judgements all are that the just expression negating is out of order sensor.

Another object of the present invention provides a kind of improved onboard diagnostic system, be used for after related internal combustion engine starts, checking the timely activation of the hot waste gas dioxygen sensor that is placed in the vehicle exhaust after-treatment system, can detect out of order sensor by this method, so just can eliminate or reduce at least the risk of undesirable discharging.

According to a second aspect of the invention, this purpose reaches according to the characteristic of claim 6, and it specifically comprises: the device that determines whether to meet starting condition; Detection is via the device of the variation of the electrical signal output of sensor; Survey the device of this signal maximum; The device that the signal that accumulation detects changes; Whether determine to accumulate in first period after starting the device on predetermined threshold; Determine the whether device on predetermined reference value of maximum value in second period after starting; Be used for reaching the device of following purpose: if these judge that at least one is that sure just expression is the sensor of proper functioning, if two judgements all are that the just expression negating is out of order sensor.

More mode of executions are listed in the dependent claims.

Should be realized that under the condition that does not deviate from protection scope of the present invention defined by the claims, feature of the present invention can be incorporated in any combination.

Description of drawings

Only as an example, referring now to description of drawings the specific embodiment of the present invention, in the accompanying drawing:

Fig. 1 is the flow chart of expression according to the method for the first embodiment of the present invention;

Fig. 2 is the flow chart of expression according to the method for the second embodiment of the present invention.

The other objects and features of the invention will become apparent from specify in conjunction with the following drawings.Yet, should be appreciated that accompanying drawing only is for graphic purpose design, rather than the definition of limitation of the present invention, restricted definition of the present invention should be with reference to appended claim.Be also to be understood that not necessarily proportionally drafting of accompanying drawing, except as otherwise noted, they only are conceptually to represent structure described herein and program.Same reference number is used to illustrate corresponding feature in different accompanying drawings.

Embodiment

Shown in flow chart among Fig. 1, in preferable first embodiment of the present invention, this method starts from square frame 1.

For check after related internal combustion engine starts is placed in the timely activation of the hot waste gas dioxygen sensor of vehicle exhaust after-treatment system, at first in square frame 2, determine whether to meet starting condition.Make following at least one when judging starting condition finish: the energising of electric transducer heater; Ambient temperature is on certain level; Ambient atmosphere is pressed on the certain level; Engine revolution is on certain level; Engineer coolant temperature within limits; Cell voltage is on certain level; Fuel does not cut off.If met starting condition, method is carried out square frame 3, if do not meet, method turns back to initial square frame 1.

In square frame 3, the variation of the electrical signal of acquisition sensor output, and survey the maximum value of this signal.In addition, accumulating the signal that detects changes.Method is carried out square frame 4 afterwards.

In square frame 4, determine in first period after starting accumulation whether on predetermined threshold, determine in square frame 5 in second period after startup that maximum value is whether on predetermined reference value.If judge that at least one is sure in 4,5, just in square frame 6, represent the sensor of proper functioning, if two judgements are all negated just to represent out of order sensor in square frame 7.Method ends at end block 11 afterwards.

Shown in flow chart among Fig. 2, in another embodiment, if above-mentioned two judgements are all negated that method continues to proceed to square frame 8 from square frame 7, and this judgement respectively third and fourth period after starting be repeated, this third and fourth period is longer than corresponding first and second periods.If at least one is sure in repeating to judge, just expression has the sensor of proper functioning of the sensor heater that breaks down in square frame 9.This will represent that sensor responds as sure judgement, although be after long duration more, because there is not the heater heats of proper functioning will need more time.Thereby, can distinguish in sensor and the heater which in view of the above and break down.If two further decision all negate, the sensor that breaks down in square frame 10 expressions just.Method ends at end block 11 afterwards.

This first, second, third and the 4th period can be selected as each scheduled time slot or be defined as the function of engine parameter value accumulation alternatively.The example that can be used to set up such accumulation of period has: the engine revolution value; Throughput; The load value; The λ value; Temperature value; The exhaust energy value.This third and fourth period should be longer than corresponding first and second periods, responds after the longer period than normal heating situation by sensor with permission and judge the sensor of the proper functioning with the sensor heater that breaks down.

Said method is preferably in the onboard diagnostic system and implements, and this system is used for checking the timely activation of the hot waste gas dioxygen sensor that is placed in the vehicle exhaust after-treatment system after related internal combustion engine starts.

Should expect that this onboard diagnostic system comprises the device that determines whether to meet starting condition.Be incorporated into the device that determines whether to meet starting condition, make the device of at least one following judgement: the energising of electric transducer heater as starting condition; Ambient temperature is on certain level; Ambient atmosphere is pressed on the certain level; Engine revolution is on certain level; Engineer coolant temperature within limits; Cell voltage is on certain level; Fuel does not cut off.

Also be provided with the device of the variation of the electrical signal output that is used for acquisition sensor; Be used to survey the device of the device of this signal maximum and the signal variation that accumulation detects.

Be provided with in addition and whether accumulate the device on predetermined threshold in first period that is used to determine after starting; With the device on predetermined reference value whether of maximum value in second period that is used to determine after starting.

Also be provided with device, be used in judgement just representing when at least one is sure the sensor of proper functioning, if two judgements all be negate just represent out of order sensor.

In another embodiment of onboard diagnostic system, be provided with device, being used for when two judgements all are to negate respectively, third and fourth period after starting repeats judgement, this third and fourth period is longer than corresponding first and second periods, and be provided with device, be used for the sensor of when repeating to judge that at least one is sure, representing to have the proper functioning of the sensor heater that breaks down, if two further decision all negate the sensor that expression is broken down.Sure judgement will represent that sensor responds, although be after long duration more, because there is not the heater heats of proper functioning will need more time.Thereby, can distinguish in sensor and the heater which in view of the above and break down.

At least one is selected as each scheduled time slot or alternatively as the function of engine parameter value accumulation in this first, second, third and the 4th period.The example that can be used to set up such accumulation of period has: the engine revolution value; Throughput; The load value; The λ value; Temperature value; The exhaust energy value.This third and fourth period should be longer than corresponding first and second periods, to allow responding the sensor of judging proper functioning with sensor heater of breaking down than normal heating situation after the longer period by sensor.

According to the present invention, should expect a kind of motor vehicle, it includes above-mentioned onboard diagnostic system.

Under the condition that does not deviate from protection scope of the present invention defined by the claims, may make change to aforementioned inventive embodiment.Such as " comprising ", " comprising ", " merging ", " by ... form ", " having ", "Yes" etc. are used for explanation and require statement of the present invention to explain in non-exclusive mode, the part, assembly or the element that also promptly allow not offer some clarification on also can occur.Relate to odd number and also can be interpreted as relating to plural number, vice versa.

The numeral that comprises in the bracket in the claims is intended to help the understanding to claim, in any case should not be construed as restriction by these claims theme required for protection.

Therefore, although being applied to the of the present invention basic novel features of its most preferred embodiment is expressed, illustrates and point out, should be appreciated that the person of ordinary skill in the field can be made at the form of described device and various omissions, replacement and the change in details and the operation.For example, can clearly realize that, carry out identical function in fact with same way as in fact and all be in protection scope of the present invention with those elements of reaching identical result and/or all combinations of method step.In addition, should be appreciated that according to any mode of execution of the present invention or embodiment is represented and/or the structure of explanation and/or element and/or method step can any other mode of execution or explanation or hint mode or embodiment in be combined into a kind of comprehensive design alternative mode.Therefore, this purpose of illustration is only to be subject to the represented protection domain of claim.

Claims (11)

1. be used for after related internal combustion engine starts, checking the timely method that activates of the hot waste gas dioxygen sensor that is placed in the vehicle exhaust after-treatment system, it is characterized in that comprising following steps:
Determine whether to meet starting condition;
The variation of the electrical signal output of acquisition sensor;
Survey this signal maximum;
The signal that accumulation detects changes;
Determine to accumulate in first period after starting whether on predetermined threshold;
Determine in second period after starting that maximum value is whether on predetermined reference value;
If at least one was the sure sensor of just representing proper functioning during these were judged, if two judgements all be negate just represent out of order sensor.
2. method according to claim 1 is characterized in that also comprising following steps:
If two judgements are all negated that then third and fourth period after starting repeats to judge respectively;
If at least one is sure in repeating to judge, then expression has the sensor of the proper functioning of the sensor heater that breaks down, if two further decision all negate then to represent the sensor that breaks down.
3. method according to claim 2 is characterized in that at least one is selected as each scheduled time slot in this first, second, third and the 4th period.
4. according to any one described method in the claim 2 to 3, it is characterized in that at least one is confirmed as the function of engine parameter value accumulation in this first, second, third and the 4th period.
5. according to any one the described method in the claim 1 to 4, it is characterized in that also comprising following steps:
In definite starting condition whether in the satisfactory step, when making at least one following judgement as starting condition: the energising of electric transducer heater; Ambient temperature is on certain level; Ambient atmosphere is pressed on the certain level; Engine revolution is on certain level; Engineer coolant temperature within limits; Cell voltage is on certain level; Fuel does not cut off.
6. be used for after related internal combustion engine starts, checking the timely onboard diagnostic system that activates of the hot waste gas dioxygen sensor that is placed in the vehicle exhaust after-treatment system, it is characterized in that comprising:
Determine whether to meet the device of starting condition;
The device of the variation of the electrical signal output of acquisition sensor;
Survey the device of this signal maximum;
The device that the signal that accumulation detects changes;
Whether determine to accumulate in first period after starting the device on predetermined threshold;
Determine the whether device on predetermined reference value of maximum value in second period after starting;
Be used for reaching the device of following purpose: if these judge that at least one is the sure sensor of just representing proper functioning, if two determine all be negate just represent out of order sensor.
7. onboard diagnostic system according to claim 6 is characterized in that also comprising:
Be used for when two judgements all are to negate the device that third and fourth period after starting respectively repeats to judge;
Device is used for when repeating to judge that at least one is sure, and expression has the sensor of the proper functioning of the sensor heater that breaks down, if two further decision all be negate the time, the sensor that expression is broken down.
8. onboard diagnostic system according to claim 7 is characterized in that at least one is each scheduled time slot in this first, second, third and the 4th period.
9. according to any one described onboard diagnostic system in the claim 7 to 8, it is characterized in that at least one is the function of engine parameter value accumulation in this first, second, third and the 4th period.
10. according to any one described onboard diagnostic system in the claim 6 to 9, it is characterized in that also comprising:
Be incorporated into the device that determines whether to meet starting condition, make at least one following when judging as the device of starting condition: the energising of electric transducer heater; Ambient temperature is on certain level; Ambient atmosphere is pressed on the certain level; Engine revolution is on certain level; Engineer coolant temperature within limits; Cell voltage is on certain level; Fuel does not cut off.
11. motor vehicle is characterized in that comprising according to any one described onboard diagnostic system in the claim 6 to 10.
CN 200810008232 2007-02-14 2008-02-14 Sensor activation monitor CN101245739B (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP07102404.6 2007-02-14
EP20070102404 EP1959121B1 (en) 2007-02-14 2007-02-14 Sensor activation monitor

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CN101245739A true CN101245739A (en) 2008-08-20
CN101245739B CN101245739B (en) 2013-05-08

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DE (1) DE602007002050D1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101598073A (en) * 2009-07-10 2009-12-09 奇瑞汽车股份有限公司 A kind of collection of pressure signal of oil rail and monitoring method
CN106198622A (en) * 2016-08-15 2016-12-07 潍柴西港新能源动力有限公司 A kind of oxygen sensor dew-point detecting device and detection method

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102012013781B4 (en) * 2012-07-11 2017-12-28 Volkswagen Aktiengesellschaft Method and device for qualifying a sensor measuring signal

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Publication number Priority date Publication date Assignee Title
JP2564510B2 (en) * 1985-12-25 1996-12-18 本田技研工業株式会社 Abnormality detection method for exhaust gas concentration sensor of internal combustion engine
DE3840148A1 (en) * 1988-11-29 1990-05-31 Bosch Gmbh Robert Method and device for detecting an error state of a lamb probe
DE59304054D1 (en) * 1993-05-14 1996-11-07 Siemens Ag Method for differentiating the causes of faults in the mixture formation or mixture control system of an internal combustion engine
GB2301901B (en) * 1995-06-05 1999-04-07 Nippon Denso Co Apparatus and method for diagnosing degradation or malfunction of oxygen sensor
JP3048531B2 (en) * 1996-12-12 2000-06-05 株式会社ゼクセル Method of diagnosing sensor failure in fuel injection device and device for diagnosing sensor failure in fuel injection device
US5801295A (en) 1997-05-27 1998-09-01 Ford Global Technologies, Inc. On-board diagnostic test of oxygen sensor
DE19729696C2 (en) * 1997-07-11 2002-02-21 Bosch Gmbh Robert Method and device for monitoring the function of a gas probe
JP4459566B2 (en) * 2003-07-10 2010-04-28 本田技研工業株式会社 Exhaust gas sensor deterioration diagnosis device
US6957562B2 (en) * 2003-07-22 2005-10-25 General Motors Corporation Passive oxygen sensor diagnostic

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101598073A (en) * 2009-07-10 2009-12-09 奇瑞汽车股份有限公司 A kind of collection of pressure signal of oil rail and monitoring method
CN106198622A (en) * 2016-08-15 2016-12-07 潍柴西港新能源动力有限公司 A kind of oxygen sensor dew-point detecting device and detection method

Also Published As

Publication number Publication date
DE602007002050D1 (en) 2009-10-01
CN101245739B (en) 2013-05-08
EP1959121B1 (en) 2009-08-19
EP1959121A1 (en) 2008-08-20

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