CN101328844B - Method for excessive heating protection of petrol engine catalyst - Google Patents
Method for excessive heating protection of petrol engine catalyst Download PDFInfo
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- CN101328844B CN101328844B CN2008101176034A CN200810117603A CN101328844B CN 101328844 B CN101328844 B CN 101328844B CN 2008101176034 A CN2008101176034 A CN 2008101176034A CN 200810117603 A CN200810117603 A CN 200810117603A CN 101328844 B CN101328844 B CN 101328844B
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Abstract
The invention relates to a method for protecting overheating of a catalyst of a gasoline engine, which utilizes ECU to judge parameters of rotating speed of an engine, a throttle opening and a water temperature collected by a sensor, an intake temperature, an intake flow and quality, and a set point modified by an ignition angle through modification of catalyst overheating; and utilizes the judgment result to control accurately a protection condition and prevent an overheating phenomenon of the catalyst to a large extent, thereby prolonging service life of the catalyst, reducing content of harmful gas in exhaustion and improving a standard of tail gas exhaustion.
Description
Technical field
The present invention relates to the petrol engine field, particularly a kind of method for excessive heating protection of petrol engine catalyst.
Background technique
Tail gas after mixed gas burnt in each cylinder when petrol engine normally moved is discharged through outlet pipe, tail gas passes through preceding lambda sensor, catalytic sensor and the post oxygen sensor of outlet pipe afterbody successively, tail gas is through catalytic converter, conversion that farthest discharges pollutants and purification make tail gas reach emission standard.
Motor car engine is in order to make the content coincidence method provisioning request of hydrocarbon, hydrocarbon and oxynitrides in the exhaust emissions, just begin in the warming-up process behind the engine start to carry out the catalyzer heating by the injection time correction, catalyzer has higher activity when being heated to 200 ℃～300 ℃ left and right sides, and catalytic efficiency is the highest; But will cause the catalyst overheating phenomenon because temperature is too high when temperature reaches 600 ℃ of left and right sides, reduce the catalyzer transformation efficiency, accelerator activator is aging when serious, makes its variation that matter takes place, so that completely loses catalysis.Therefore, must monitor, when catalyst temperature is too high, enable the catalyst overheating protection, guarantee the transformation efficiency of catalyzer, reduce content of harmful gas in the tail gas, make discharging reach higher standard the temperature of catalyzer.
Patent CN1696479 discloses a kind of exhaust gas purification apparatus that is used for internal-combustion engine, catalyzer on the filter substrate of determining to remain on particulate filter is not when being in activated state, carrying out fuel at the top dead center ECU near crank sprays, afterwards, after one of experience can not cause lacking the injection interval of fire, ECU carries out follow-up fuel and sprays the temperature that improves exhaust, thereby improves the temperature of filter, reaches the effect of exhaust gas purification with this.
Patent US6044642 discloses a kind of direct injection ic engine.It comprises the spark plug that gos deep into fuel chambers, be used for fuel oil directly spray into fuel chambers nozzle, be arranged in the flue and be used for purifying exhaust air catalyzer, be used for measuring temperature transducer, the control unit of the coolant temperature situation of catalyzer.This control unit is used for from the sensor received signal, thereby determines that the temperature of catalyzer is lower than its active temperature when engineer coolant temperature is lower than predetermined value; When definite catalyst temperature is lower than its active temperature, this element is used for controlling the fuel injection timing and the fuel injection amount of nozzle, thereby around spark plug, form the dense fuel gas mixture identical or denseer, and the lean-burn gas mixed gas rarer than fuel gas mixture with chemically correct fuel with fuel gas mixture with chemically correct fuel; This control unit is used for producing signal and gives nozzle, thereby makes it in fuel injection timing oil spout.Thereby improved the exhaust gas discharging performance and helped catalyzer and the heating of motor.
Thereby the available research achievements majority is intended to reach by the temperature of variety of way raising catalytic converter the effect of exhaust gas purification at present, the situation that owing to catalyst overheating the catalyzer transformation efficiency is reduced on the contrary when not having the consideration temperature too high.
Summary of the invention
(1) technical problem that will solve
The invention provides a kind of method for excessive heating protection of petrol engine catalyst, this method can be taked protective measure when judging catalyst overheating, effectively avoids because the problem that the transformation efficiency that catalyst overheating brings reduces.
(2) technological scheme
In order to reach above goal of the invention, technological scheme of the present invention provides a kind of method for excessive heating protection of petrol engine catalyst, may further comprise the steps:
S1: the set point signal of gathering firing angle correction in engine rotational speed signal, throttle opening signal, engine temperature signal, air inlet quality and flux signal and the catalyst overheating correction;
S2: when the throttle opening signal between minimum and maximum, engine temperature signal is greater than a temperature threshold, charge flow rate and quality signal are more than or equal to an airflow threshold, and when the set point signal of firing angle correction is smaller or equal to a firing angle correction threshold in the catalyst overheating correction, increase injection time gradually; When engine temperature signal smaller or equal to this temperature threshold, charge flow rate and quality signal less than this airflow threshold or catalyst overheating correction in the set point signal of firing angle correction during greater than this firing angle correction threshold, reduce injection time gradually.
Wherein, described temperature threshold is the minimum water temperature that finishes the air fuel ratio closed-loop adjustment under the non-idling condition; Minimum air flow threshold value when described airflow threshold is the catalyst overheating protection; Pinking control ignition angle correction threshold when described firing angle correction threshold is catalyst overheating protection inefficacy.
Wherein, the increase of described injection time is stepped.
Wherein, the increasing amount of described injection time is 0.5 millisecond.
Wherein, the injection time of described increase must not surpass injection time and changes limiting quantity in 720 write music increasing degrees in the axial period.
Wherein, described injection time variation limiting quantity is 5 milliseconds.
Wherein, the minimizing of described injection time is stepped.
Wherein, the reduction of described injection time is 0.5 millisecond.
Wherein, the injection time of described minimizing must not surpass injection time in 720 the minimizing amplitudes in the axial period of writing music and changes limiting quantity.
Wherein, described injection time variation limiting quantity is 5 milliseconds.
(3) beneficial effect
Method of the present invention can realize the accurate control of catalyst overheating protective condition, can prevent the catalyst overheating phenomenon dramatically, thereby prolongs the working life of catalyzer, reduces the harmful gas content in the discharging, improves exhaust emission standard.
Description of drawings
Fig. 1 is the control flow chart of excessive heating protection of petrol engine catalyst of the present invention;
Fig. 2 is the schematic diagram of excessive heating protection of petrol engine catalyst of the present invention.
1: the scalar quantity of injection time correction adds the catalyst overheating protection injection time fair curve relevant with firing angle; 2: the injection time fair curve; 3: be used for the amount of logic curve that the catalyst overheating protection detects; The 4:720 axial period of writing music; 5: injection time changes restriction.
Embodiment
Following examples are used to illustrate the present invention in conjunction with the accompanying drawings, but are not used for limiting the scope of the invention.
The principle of method for excessive heating protection of petrol engine catalyst provided by the present invention is as follows: at first, gather the engine crankshaft tach signal by crankshaft position sensor, gather the throttle opening signal by throttle position sensor, gather engine temperature signal by cooling-water temperature sensor, by temperature, flow and the quality signal of intake air temperature sensor and pressure transducer detection air inlet, by the knocking state of detonation sensor detection of engine; Secondly, ECU (ElectronicControl Unit, electronic control unit) the throttle opening signal of engine crankshaft tach signal of gathering according to crankshaft sensor and throttle position sensor collection is determined the running state of motor, be closure potentiometer signal between minimum and maximum the time, ECU determines motor entering part load condition; The engine temperature signal that ECU gathers according to cooling-water temperature sensor, with the minimum water temperature that finishes the closed adjusting of air fuel ratio under the non-idling condition of system calibrating amount, determine the state of temperature of present engine, promptly when engine temperature finished the water temperature of air fuel ratio closed-loop adjustment minimum under greater than non-idling condition, the state of temperature of present engine was for carrying out the state of temperature of catalyst overheating protection; Minimum air flow threshold value when charge flow rate that ECU gathers according to intake temperature and pressure transducer and quality signal are protected with catalyst overheating, determine the charge flow rate and the quality state of present engine, promptly when intake temperature, flow and quality were not less than the minimum air flow threshold value in catalyst overheating when protection, the intake temperature of present engine, flow and quality were in the state that need carry out the catalyst overheating protection; Pinking control ignition angle correction threshold when ECU lost efficacy the setting value of firing angle correction in the catalyst overheating correction and catalyst overheating protection compares, determine the state of current catalyst overheating protection firing angle correction, promptly be less than or equal to the catalyst overheating protection when losing efficacy the correction threshold of pinking control ignition angle the time when the set point of firing angle correction in the catalyst overheating correction, the state of current catalyst overheating protection firing angle correction is for carrying out the state of catalyst overheating protection; At last; running state according to motor; the state of temperature of motor; the state of the charge flow rate of motor and quality state and the correction of catalyst overheating protection firing angle determines whether catalyzer is in the overheated stage; that is to say; in the time of motor entering part load behavior; if the state of temperature of motor; the intake temperature of motor; the state of flow and quality state and the correction of current catalyst overheating protection firing angle all is in the state that need carry out the catalyst overheating protection; then catalyzer is in the overheated stage; in order to guarantee that catalyst efficiency is unlikely to reduce significantly, then increase injection time.In catalyst overheating protection process, still above state is carried out cycle criterion, when above state judgement has one not satisfy, reduce injection time gradually.
Be illustrated in figure 1 as the control flow chart of excessive heating protection of petrol engine catalyst of the present invention.The engine crankshaft tach signal that ECU gathers according to crankshaft sensor and the throttle opening signal of throttle position sensor collection determine that the running state of motor is the partial load state, if the temperature of motor is greater than the highest water temperature that finishes the air fuel ratio closed-loop adjustment under the non-idling condition at this moment, and charge flow rate and quality minimum air flow threshold value when protecting more than or equal to catalyst overheating, and the set point of firing angle correction in the catalyst overheating correction was when losing efficacy smaller or equal to catalyst overheating protection during the correction threshold of pinking control ignition angle, increase injection time, this moment, the increase of injection time was stepped, the increasing amount of described injection time is 0.5 millisecond, guarantee simultaneously, must not surpass injection time and change restriction in 720 increasing degrees of writing music in the axial period, the variation limiting quantity of described injection time is 5 milliseconds; Finish the highest water temperature of air fuel ratio closed-loop adjustment under smaller or equal to non-idling condition when the temperature of motor; minimum air flow threshold value when perhaps charge flow rate and quality are protected less than catalyst overheating; when perhaps the set point of firing angle correction lost efficacy greater than catalyst overheating protection in the catalyst overheating correction during correction threshold of pinking control ignition angle; then reduce injection time; the minimizing of described injection time is stepped; the reduction of described injection time is 0.5 millisecond; and must not surpass injection time and change restriction in the 720 minimizing amplitudes of writing music in the axial period, it is 5 milliseconds that described injection time changes limiting quantity.
The highest above-mentioned water temperature is the steady state value that is stored among the ECU, and for different engine types, this value is also different, and promptly this value also can be different among the ECU of different model.The procurement process of this value is to allow motor be in idling mode earlier, guarantees to start various piece to run well then, and particularly catalyzer must be in normal operating temperature, superheating phenomenon do not occur.The minimum water temperature of record when finishing the air fuel ratio closed-loop adjustment under these conditions, and be stored among the ECU in the corresponding variable.
Minimum air flow threshold value when described catalyst overheating is protected is the steady state value that directly is stored among the ECU.The procurement process of this value is by calibration experiment, motor is under the condition of catalyst overheating turns round.Personnel regulate the air-flow threshold values and make and to start working properlyly that be in when motor under the state of proper functioning, record also stores air-flow threshold values and the catalyst temperature of this moment by experiment then.When needs call this value, get final product by the air-flow threshold values of searching under the corresponding catalyst temperature.
Described firing angle correction threshold is the steady state value that directly is stored among the ECU.The procurement process of this value is by calibration experiment, and the condition that makes motor be in catalyst overheating turns round.Personnel regulate firing angle and make engine operation normal by experiment then.Be in when motor under the state of normal work, record also stores catalyst temperature and firing angle at this moment.When need are used this value,, it is called as long as just can inquire corresponding firing angle value by the temperature of catalyzer.And concrete corresponding catalyst temperature is different along with different motors with firing angle.
Figure 2 shows that the schematic diagram of the method for excessive heating protection of petrol engine catalyst of the embodiment of the invention.Size identification motor by closure potentiometer signal is in sub load or full load mode, and when promptly closure potentiometer signal was between minimum and maximum, ECU determined motor entering part load condition; When signal reaches maximum, then enter full load mode.Only under the situation of engine section load, just will consider the protection problem of catalyst overheating.The situation of change of three fair curves shown in this figure, this situation of change just in order better to explain the technology of this patent, might not be confined in the reality change according to such change curve.Curve 1 is that the scalar quantity of catalyst overheating protection injection time correction adds the catalyst overheating protection injection time correction relevant with firing angle; Curve 2 is the injection time corrections that are used for the catalyst overheating protection; Curve 3 is to be used for the amount of logic that the catalyst overheating protection detects.When the value of curve 3 becomes 1; the expression catalyzer is in the overheated stage; need take the engine overheat protection; so curve 2 is a unit of time with 720 axial periods of writing music; change to be restricted to the injection time under the catalyst overheating protective function situation and increase unit and change, up to the maximum value that reaches correction.And curve 1 be changed to peaked half, when curve 2 arrived maximum values, curve 1 also was increased to maximum value.When in catalyst overheating protection process, still the state of motor being judged, when having one not satisfy, the state judgement then reduces injection time.The minimizing of injection time is a unit of time with 720 axial periods 4 of writing music, and changes restriction 5 with injection time and is the unit that successively decreases, and the variation of successively decreasing is changed to 0 up to curve 2.At this moment, three curves all are changed to 0.
Above mode of execution only is used to illustrate the present invention; and be not limitation of the present invention; the those of ordinary skill in relevant technologies field; under the situation that does not break away from the spirit and scope of the present invention; can also make various variations; therefore all technological schemes that are equal to also belong to category of the present invention, and scope of patent protection of the present invention should be defined by the claims.
Claims (10)
1. a method for excessive heating protection of petrol engine catalyst is characterized in that, may further comprise the steps:
S1: the set point signal of gathering firing angle correction in engine rotational speed signal, throttle opening signal, engine temperature signal, air inlet quality and flux signal and the catalyst overheating correction;
S2: when the throttle opening signal between minimum and maximum, engine temperature signal is greater than a temperature threshold, charge flow rate and quality signal are more than or equal to an airflow threshold, and when the set point signal of firing angle correction is smaller or equal to a firing angle correction threshold in the catalyst overheating correction, increase injection time gradually; When engine temperature signal smaller or equal to this temperature threshold, charge flow rate and quality signal less than this airflow threshold or catalyst overheating correction in the set point signal of firing angle correction during greater than this firing angle correction threshold, reduce injection time gradually.
2. method for excessive heating protection of petrol engine catalyst as claimed in claim 1 is characterized in that, described temperature threshold is the minimum water temperature that finishes the air fuel ratio closed-loop adjustment under the non-idling condition; Minimum air flow threshold value when described airflow threshold is the catalyst overheating protection; Pinking control ignition angle correction threshold when described firing angle correction threshold is catalyst overheating protection inefficacy.
3. as each described method for excessive heating protection of petrol engine catalyst of claim 1～2, it is characterized in that the increase of described injection time is stepped.
4. method for excessive heating protection of petrol engine catalyst as claimed in claim 3 is characterized in that, the increasing amount of described injection time is 0.5 millisecond.
5. method for excessive heating protection of petrol engine catalyst as claimed in claim 4 is characterized in that, the injection time of described increase must not surpass injection time and changes limiting quantity in 720 write music increasing degrees in the axial period.
6. method for excessive heating protection of petrol engine catalyst as claimed in claim 5 is characterized in that, it is 5 milliseconds that described injection time changes limiting quantity.
7. as each described method for excessive heating protection of petrol engine catalyst of claim 1～2, it is characterized in that the minimizing of described injection time is stepped.
8. method for excessive heating protection of petrol engine catalyst as claimed in claim 7 is characterized in that, the reduction of described injection time is 0.5 millisecond.
9. method for excessive heating protection of petrol engine catalyst as claimed in claim 8 is characterized in that, the injection time of described minimizing must not surpass injection time in 720 the minimizing amplitudes in the axial period of writing music and change limiting quantity.
10. method for excessive heating protection of petrol engine catalyst as claimed in claim 9 is characterized in that, it is 5 milliseconds that described injection time changes limiting quantity.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008101176034A CN101328844B (en) | 2008-08-01 | 2008-08-01 | Method for excessive heating protection of petrol engine catalyst |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2008101176034A CN101328844B (en) | 2008-08-01 | 2008-08-01 | Method for excessive heating protection of petrol engine catalyst |
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| CN101328844A CN101328844A (en) | 2008-12-24 |
| CN101328844B true CN101328844B (en) | 2010-06-16 |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1517526A (en) * | 2003-01-21 | 2004-08-04 | �����Զ�����ʽ���� | Waste gas purification system |
| CN1598255A (en) * | 2003-09-17 | 2005-03-23 | 日产自动车株式会社 | Regeneration control of diesel particulate filter |
| CN1624316A (en) * | 2003-11-12 | 2005-06-08 | 丰田自动车株式会社 | Fuel injection control apparatus and fuel injection control method for internal combustion engine |
| CN1844646A (en) * | 2005-04-08 | 2006-10-11 | 日产自动车株式会社 | Exhaust system for an internal combustion engine |
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2008
- 2008-08-01 CN CN2008101176034A patent/CN101328844B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1517526A (en) * | 2003-01-21 | 2004-08-04 | �����Զ�����ʽ���� | Waste gas purification system |
| CN1598255A (en) * | 2003-09-17 | 2005-03-23 | 日产自动车株式会社 | Regeneration control of diesel particulate filter |
| CN1624316A (en) * | 2003-11-12 | 2005-06-08 | 丰田自动车株式会社 | Fuel injection control apparatus and fuel injection control method for internal combustion engine |
| CN1844646A (en) * | 2005-04-08 | 2006-10-11 | 日产自动车株式会社 | Exhaust system for an internal combustion engine |
Non-Patent Citations (2)
| Title |
|---|
| JP特开平6-185350A 1994.07.05 |
| JP特开平8-238958A 1996.09.17 |
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Owner name: CHINA VAGON (BEIJING) CARTRONICS HOLDING CO., LTD. Free format text: FORMER NAME: HUAXIA LONGHUI (BEIJING) AUTOMOBILE ELECTRONIC TECHNOLOGY CO., LTD. |
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Address after: 102206 No. 97, Changping Road, Shahe Town, Beijing, Changping District Patentee after: Huaxia Long Hui (Beijing) automotive electronic Polytron Technologies Inc Address before: 102206 8 building, No. 97, Changping Road, Shahe Town, Beijing, Changping District Patentee before: China Vagon (Beijing) Automobile Electronic Technology Co., Ltd. |
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Granted publication date: 20100616 Termination date: 20180801 |