CN102650229B - Method and device for detecting oxygen storage capacity of three-way catalyst - Google Patents
Method and device for detecting oxygen storage capacity of three-way catalyst Download PDFInfo
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- CN102650229B CN102650229B CN2011100503238A CN201110050323A CN102650229B CN 102650229 B CN102650229 B CN 102650229B CN 2011100503238 A CN2011100503238 A CN 2011100503238A CN 201110050323 A CN201110050323 A CN 201110050323A CN 102650229 B CN102650229 B CN 102650229B
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Abstract
The invention discloses a method for detecting oxygen storage capacity. The method comprises the following steps of: absorbing oxygen in a saturation way by a catalyst when a vehicle runs; after the catalyst absorbs oxygen in a saturation way, obtaining an engine intake flow of a special moment based on a preset sampling period starting from the front oxygen reaction moment; utilizing the obtained engine intake flow to calculate the oxygen storage quantity of the catalyst at each sampling moment; accumulating the oxygen storage capacities starting from the front oxygen reaction moment to the ending of the rear oxygen reaction moment, wherein the front oxygen reaction moment is the moment that the voltage of a front oxygen sensor signal rises up to pass through the first preset value, and the rear oxygen reaction moment is the moment that the voltage of a rear oxygen sensor signal rises up to pass through the second preset value. The device for detecting oxygen storage capacity of the three-way catalyst comprises an intake flow sampling unit, a multiplier and an accumulator. With the adoption of the method and a device provided by the invention, the successful rate of detection is improved, and the measuring accuracy of the oxygen storage capacity of the catalyst is improved, thus, better reliability of the detection result of the catalyst can be ensured.
Description
Technical field
The present invention relates to a kind of oxygen storage capacity detecting method and detection device of ternary catalyzing unit.
Background technique
Along with to the improving constantly of environmental protection requirement, the discharge capacity of motor reduces day by day, efficient increases gradually, simultaneously, for any inefficacy that may cause the component that vehicle emission exceeds standard on the vehicle, all requires onboard system (OBD) effectively to Report a Problem.Particularly when as the ternary catalyzing unit inefficiency of vehicle emission catalyticing conversioning equipment, the vehicle mounted failure detection system must be reported fault.
At present, vehicle-mounted detecting system comprises the detecting method of ternary catalyzing unit: under idling operation, to motor carry out fuel oil partially rare/partially dense control; Before and after measuring the reaction time of lambda sensor poor, the efficient of ternary catalyzing unit is judged the concrete grammar following steps according to this time difference:
(1) the saturated oxygen uptake of catalyst converter.In this stage, engine air-fuel ratio is partially rare, and oxygen is superfluous in the emission, and polynary oxygen is made catalyst converter fully absorb oxygen in this stage by catalyst adsorbs, is in a state as can be known.
(2) oxygen storage capacity is measured.In this stage, engine air-fuel ratio is partially dense, and oxygen is not enough in the emission, and unnecessary burn incompletely thing will consume the oxygen that catalyst converter stores, and calculates the oxygen storage capacity of catalyst converter from ruing out of the required unnecessary fuel oil of oxygen that stores in the catalyst converter.
Said method is based on following principle:
OSC(gramsO
2)@T=MAF(t)×ABS(FR-1)×(MO
2/Mair)×t_OSC0 (1)
Wherein:
OSC (grams O
2)@T is the oxygen storage capacity of catalyst converter
MAF (t) is the charge flow rate of motor, this value stabilization under the idling operation;
True equivalent air fuel ratio (equivalent air fuel ratio=air fuel ratio/14.7) when FR is Test Cycle is constant;
MO
2/ Mair is oxygen percentage in the air, is constant;
T_OSC0 is that the reaction time of front and back oxygen in the measuring phase is poor;
MAF (t) * ABS (FR-1) * (MO
2/ Mair) be the amount of oxygen in the catalyst converter that consumes in the measuring phase.Wherein, ABS() be to carry out the function that absolute value calculates.
Because the oxygen proportion all is constant in air inflow, air fuel ratio, the air, so the oxygen storage capacity of catalyst converter just is directly proportional with poor t_OSC0 of the reaction time of front and back lambda sensor.
For the fuel economy of pursuing, in the process of small displacement development, the air inflow MAF under the engine idling condition (t) is more and more less at motor.Under this operating mode, because air input of engine by air is little, utilize said method that the efficient of ternary catalyzing unit is detected, can produce following negative consequence:
One, because air inflow MAF (t) is little, for same catalyst converter, because oxygen storage capacity OSC (grams O
2)@T is the same, in the constant situation of the equivalent air fuel ratio in measuring phase, can cause detection time t_OSC0 elongated, thereby affect detection speed.
Two, because air inflow MAF (t) is little, and the measuring accuracy of air inflow is poor, the air inflow measurement error can reach 10% in the little air inflow situation, causes measurement result OSC (grams O
2)@T scattered error becomes large, so that the measurement result deterioration in accuracy.
Three, under little air inflow condition, carry out air fuel ratio partially rare/partially dense control, make engine cylinder internal combustion variation, cause the engine stabilization variation, the fluctuation of speed is excessive, so that motor has flame-out risk.
Therefore be necessary to design a kind of novel detection method, to overcome the problem of prior art.
Summary of the invention
For the defective of prior art, the purpose of this invention is to provide the detecting method that a kind of detection speed is faster, measuring accuracy is higher.
Oxygen storage capacity detecting method of the present invention comprises: a. makes the saturated oxygen uptake of catalyst converter when vehicle operating; B. after the saturated oxygen uptake of catalyst converter, the oxygen reaction begins constantly in the past, obtains the engine intake airflow of particular moment to be scheduled to the sampling period; C. utilize the engine intake airflow that obtains, according to following formula, calculate the catalyst converter oxygen storage capacity of each sampling instant:
MAF (t) is engine intake airflow, this variable temporal evolution; FR is the equivalent air fuel ratio, and this value is constant; MO
2/ Mair is oxygen percentage in the air, is constant;
The sampling period, t
xBe sampling instant, ABS is the function that carries out signed magnitude arithmetic(al);
D. to according to calculating among the step c, the oxygen reaction catalyst converter oxygen storage capacity that constantly begins, constantly finish to rear oxygen reaction adds up in the past, and wherein, the voltage that front oxygen reaction constantly is front oxygen sensor signal rises and passes through the moment of first predetermined value; The voltage that rear oxygen reaction constantly is the post oxygen sensor signal rises and passes through the moment of the second predetermined value.
Preferably, described equivalent air fuel ratio is 14.7.
Preferably, described the first predetermined value is 450 millivolts.
Preferably, described the second predetermined value is 450 millivolts.
Oxygen storage capacity detection device provided by the invention comprises: air inflow sampling unit, multiplier, accumulator, and wherein, described air inflow sampling unit is used for acquisition at the charge flow rate of predetermined instant motor; Described multiplier is used for following physical quantity is multiplied each other: MAF (t
x), ABS (FR-1), MO
2/ Mair,
Wherein, MAF (t) is engine intake airflow, this variable temporal evolution; FR is the equivalent air fuel ratio, and this value is constant; MO
2/ Mair is oxygen percentage in the air, is constant;
The sampling period, t
xBe sampling instant, ABS is the function that carries out signed magnitude arithmetic(al).Described accumulator is used for multiplier is calculated, and the oxygen reaction catalyst converter oxygen storage capacity that constantly begins, constantly finish to rear oxygen reaction adds up in the past, and wherein, the voltage that front oxygen reaction constantly is front oxygen sensor signal rises and passes through the moment of the first predetermined value; The voltage that rear oxygen reaction constantly is the post oxygen sensor signal rises and passes through the moment of the second predetermined value.
Preferably, described equivalent air fuel ratio is 14.7.
Preferably, described the first predetermined value is 450 millivolts.
Preferably, described the second predetermined value is 450 millivolts.
Technological scheme of the present invention has changed the operating conditions when detecting test, the detection under the idling condition of the prior art is changed in the Vehicle Driving Cycle way detected.In addition, technological scheme of the present invention has changed and has detected the object of measuring, and detected object becomes concrete catalyst converter oxygen storage capacity from the time so that measure more accurate.
With respect to prior art, the present invention is when detecting motor, can avoid under the little air inflow condition of idling, carrying out the biasing Control experiment of air fuel ratio, and avoid motor operation control stability is disturbed, eliminate engine speed fluctuation risk.
In running, air input of engine by air MAF (tx) is larger, at catalyst converter oxygen storage capacity OSC (grams O
2) under the constant condition of@T, shorten detection time, improved the success rate that detects, and makes catalyst converter detect easier finishing, and guaranteed test conditions and number of times that catalyst converter detects.
Because air inflow MAF (tx) is large, the measurement error of MAF (tx) diminishes, so actual mixing ratio control is more stable, has reduced to measure the fluctuating error scope of calculating, improve the measuring accuracy of catalyst converter oxygen storage volume, can guarantee better the reliability of catalyst converter testing result.
Description of drawings
Fig. 1 is the flow chart of the oxygen storage capacity detecting method of the ternary catalyzing unit in one embodiment of the present invention;
Fig. 2 is the structural representation of the oxygen storage capacity detection device of the ternary catalyzing unit in one embodiment of the present invention.
Embodiment
The oxygen storage capacity detecting method that is used for ternary catalyzing unit in a kind of embodiment of the present invention may further comprise the steps:
In step 201, when vehicle operating, make the saturated oxygen uptake of catalyst converter.Catalyst converter fully absorbs oxygen in this stage, is in a state as can be known.In the vehicle operating process, air input of engine by air MAF (tx) is large, so the measurement of air inflow is more accurate, so that the measurement of final oxygen storage capacity is also more accurate, according to the test in the present embodiment, the measurement error of oxygen storage capacity is less than 5%.
Oxygen storage capacity detecting method of the present invention is based on following principle and realizes:
Wherein, OSC (grams O
2)@T is the oxygen storage capacity of catalyst converter; MAF (t) is the charge flow rate of motor, and this amount changes during Vehicle Driving Cycle, is variable; FR is the equivalent air fuel ratio, is constant; MO
2/ Mair is oxygen percentage in the air, is constant; T0 is the front oxygen reaction moment, that is: front oxygen sensor signal rises to high voltage from low voltage, passes through 450 millivolts the moment; T1 is the rear oxygen reaction moment, that is: the post oxygen sensor signal rises to high voltage from low voltage, passes through 450 millivolts the moment;
Therefore, in step 202, after the saturated oxygen uptake of catalyst converter, the oxygen reaction begins constantly in the past, obtains the engine intake airflow of particular moment to be scheduled to the sampling period.By computer technology, guarantee the fast sampling to air inflow, thereby realize described integral and calculating.In one embodiment of the invention, the sampling period is 10ms, i.e. every 10ms sampling once.
In step 203, utilize the engine intake airflow that obtains, according to following formula, calculate the catalyst converter oxygen storage capacity of each sampling instant:
Wherein: MAF (t) is engine intake airflow, and tx is sampling instant, this variable temporal evolution; FR is the equivalent air fuel ratio, and this value is constant; MO
2/ Mair is oxygen percentage in the air, is constant;
Being the sampling period, ABS() is the function that carries out signed magnitude arithmetic(al).
In step 203, the past oxygen reaction constantly t0 begins, and then every 10ms carries out the computing of above-mentioned formula (a) to engine intake airflow MAF (tx) once sampling.When the sampling time surpassed rear oxygen reaction moment t1, sampling and calculating stopped.
In step 204, the catalyst converter oxygen storage capacity that the past oxygen reaction that calculates according to formula in the step 203 is constantly begun, constantly finishes to rear oxygen reaction adds up.During constantly reacting constantly to rear oxygen front oxygen reaction all
It is cumulative,
Because 10 milliseconds of samplings are once, so (t1-t0) in second 100 * (t1-t0) individual sampled points are arranged, therefore, accumulation result is:
That is:
Cumulative result is carved into the catalyst converter oxygen memory space between the rear oxygen reaction constantly when being exactly front oxygen reaction.
Wherein, the reaction of front oxygen constantly is that the voltage of front oxygen sensor signal rises and passes through the moment of the first predetermined value; The voltage that rear oxygen reaction constantly is the post oxygen sensor signal rises and passes through the moment of the second predetermined value.
The present invention is to detecting operating mode and measuring content and done improvement, and each element of binding engine electronic controller ECU, front and back lambda sensor and electric injection system by Software for Design, has been realized a kind of new catalyst converter oxygen storage capacity detecting method.
The present invention carries out partially rare/partially dense active to the vehicle motor air fuel ratio and inserts control, change the Test Cycle that detects test in the Vehicle Driving Cycle process.Equally, owing to be to insert in the process of moving test, the air inflow of motor is no longer stable, at this moment, can not simply measure the poor efficient of judging catalyst converter of reaction time of front and back lambda sensor when detecting test.But adopted measurement to the true oxygen storage capacity of catalyst converter as measuring object, detect.
Correspondingly, the present invention also provides a kind of oxygen storage capacity detection device 300 for ternary catalyzing unit, as shown in Figure 2, in one embodiment, described oxygen storage capacity detection device 300 comprises: air inflow sampling unit 301, multiplier 302, accumulator 303.
Described air inflow sampling unit 301 is used for acquisition at the charge flow rate of predetermined instant motor.Air inflow sampling unit 301 can be by flow transducer and corresponding computer software module and hardware control unit realization.
Described multiplier 302 is used for carrying out multiplying, in the present invention, is used for MAF (tx), ABS (FR-1), MO
2/ Mair,
Multiply each other.Wherein, MAF (t) is engine intake airflow, this variable temporal evolution; FR is the equivalent air fuel ratio, and this value is constant; MO
2/ Mair is oxygen percentage in the air, is constant;
Be the sampling period, tx is sampling instant, and ABS is the function that carries out signed magnitude arithmetic(al).
Described accumulator 303 is used for multiplier is calculated, the catalyst converter oxygen storage capacity that the oxygen reaction begins constantly in the past, extremely rear oxygen reaction finishes constantly adds up, wherein, the reaction of front oxygen constantly is that the voltage of front oxygen sensor signal rises and passes through the moment of the first predetermined value; The voltage that rear oxygen reaction constantly is the post oxygen sensor signal rises and passes through the moment of the second predetermined value.Preferably, described equivalent air fuel ratio is 14.7; Described the first predetermined value is 450 millivolts; Described the second predetermined value is 450 millivolts.
It will be understood by those skilled in the art that described multiplier 302, accumulator 303 all can be by software module or electronic circuit realizations.
Although the invention discloses above-described embodiment; but specific embodiment be not limit of the present invention; any those skilled in the art; without departing from the spirit and scope of the present invention; can make some modifications and retouching, so protection scope of the present invention should be as the criterion with the scope that appending claims defines.
Claims (8)
1. the oxygen storage capacity detecting method of a ternary catalyzing unit is characterized in that, said method comprising the steps of:
A. when vehicle operating, make the saturated oxygen uptake of catalyst converter;
B. after the saturated oxygen uptake of catalyst converter, the oxygen reaction begins constantly in the past, obtains the engine intake airflow of particular moment to be scheduled to the sampling period;
C. utilize the engine intake airflow that obtains, according to following formula, calculate the catalyst converter oxygen storage capacity of each sampling instant:
MAF (t) is engine intake airflow, this variable temporal evolution; FR is the equivalent air fuel ratio, and this value is constant; MO
2/ Mair is oxygen percentage in the air, is constant;
The sampling period, t
xBe sampling instant, ABS is the function that carries out signed magnitude arithmetic(al);
D. to according to calculating among the step c, the oxygen reaction catalyst converter oxygen storage capacity that constantly begins, constantly finish to rear oxygen reaction adds up in the past, and wherein, the voltage that front oxygen reaction constantly is front oxygen sensor signal rises and passes through the moment of first predetermined value; The voltage that rear oxygen reaction constantly is the post oxygen sensor signal rises and passes through the moment of the second predetermined value.
2. method according to claim 1 is characterized in that, described equivalent air fuel ratio is 14.7.
3. method according to claim 1 is characterized in that, described the first predetermined value is 450 millivolts.
4. method according to claim 1 is characterized in that, described the second predetermined value is 450 millivolts.
5. the oxygen storage capacity detection device of a ternary catalyzing unit is characterized in that, described device comprises: air inflow sampling unit, multiplier, accumulator, wherein,
Described air inflow sampling unit is used for acquisition at the charge flow rate of predetermined instant motor;
Described multiplier is used for following physical quantity is multiplied each other: MAF (t
x), ABS (FR-1), MO
2/ Mair,
, wherein, MAF (t) is engine intake airflow, this variable temporal evolution; FR is the equivalent air fuel ratio, and this value is constant; MO
2/ Mair is oxygen percentage in the air, is constant;
The sampling period, t
xBe sampling instant, ABS is the function that carries out signed magnitude arithmetic(al);
Described accumulator is used for multiplier is calculated, and the oxygen reaction catalyst converter oxygen storage capacity that constantly begins, constantly finish to rear oxygen reaction adds up in the past, and wherein, the voltage that front oxygen reaction constantly is front oxygen sensor signal rises and passes through the moment of the first predetermined value; The voltage that rear oxygen reaction constantly is the post oxygen sensor signal rises and passes through the moment of the second predetermined value.
6. device according to claim 5 is characterized in that, described equivalent air fuel ratio is 14.7.
7. device according to claim 5 is characterized in that, described the first predetermined value is 450 millivolts.
8. device according to claim 5 is characterized in that, described the second predetermined value is 450 millivolts.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011100503238A CN102650229B (en) | 2011-02-24 | 2011-02-24 | Method and device for detecting oxygen storage capacity of three-way catalyst |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011100503238A CN102650229B (en) | 2011-02-24 | 2011-02-24 | Method and device for detecting oxygen storage capacity of three-way catalyst |
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| CN102650229A CN102650229A (en) | 2012-08-29 |
| CN102650229B true CN102650229B (en) | 2013-10-30 |
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Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104832305B (en) * | 2014-12-16 | 2018-03-27 | 北汽福田汽车股份有限公司 | Oxygen storage capacity detection method, system and the vehicle of automobile catalytic device |
| DE102015201400A1 (en) * | 2015-01-28 | 2016-07-28 | Robert Bosch Gmbh | Method for determining limits of a determination of an offset at least in a range of a voltage-lambda characteristic of a first lambda probe arranged in an exhaust passage of an internal combustion engine with respect to a reference voltage-lambda characteristic |
| CN105673169B (en) * | 2016-01-27 | 2018-05-04 | 潍柴动力股份有限公司 | A kind of method and device for being used to monitor ternary catalyzing unit in engine exhaust system |
| CN107676158B (en) * | 2017-09-19 | 2019-11-05 | 北京汽车研究总院有限公司 | The method for diagnosing faults and device of triple mode catalytic converter |
| DE102018251720A1 (en) * | 2018-12-27 | 2020-07-02 | Robert Bosch Gmbh | Method for determining a maximum storage capacity of an exhaust gas component storage device of a catalytic converter |
| CN110259553B (en) * | 2019-06-28 | 2020-11-03 | 潍柴动力股份有限公司 | Method and device for calculating oxygen storage amount of three-way catalyst and electronic equipment |
| CN110284947A (en) * | 2019-06-28 | 2019-09-27 | 潍柴动力股份有限公司 | A kind of three-way catalytic converter aging detection method and device |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| EP0546318A1 (en) * | 1991-12-10 | 1993-06-16 | Robert Bosch Gmbh | Method and device for the determination of the conversion efficiency of a catalyst |
| CN1363013A (en) * | 2000-02-16 | 2002-08-07 | 日产自动车株式会社 | Engine exhaust purifying device |
| KR100906881B1 (en) * | 2008-05-02 | 2009-07-08 | 현대자동차주식회사 | Front and rear oxygen sensor controlling and catalyzer monitoring method |
| CN101636568A (en) * | 2007-03-30 | 2010-01-27 | 丰田自动车株式会社 | Catalyst degradation determination device for internal combustion engine |
-
2011
- 2011-02-24 CN CN2011100503238A patent/CN102650229B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0546318A1 (en) * | 1991-12-10 | 1993-06-16 | Robert Bosch Gmbh | Method and device for the determination of the conversion efficiency of a catalyst |
| CN1363013A (en) * | 2000-02-16 | 2002-08-07 | 日产自动车株式会社 | Engine exhaust purifying device |
| CN101636568A (en) * | 2007-03-30 | 2010-01-27 | 丰田自动车株式会社 | Catalyst degradation determination device for internal combustion engine |
| KR100906881B1 (en) * | 2008-05-02 | 2009-07-08 | 현대자동차주식회사 | Front and rear oxygen sensor controlling and catalyzer monitoring method |
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