CN103244291A - Constant-torque self-learning control device of lean-burn gasoline engine with (oxides of nitrogen) adsorber-reduction catalytic converter - Google Patents
Constant-torque self-learning control device of lean-burn gasoline engine with (oxides of nitrogen) adsorber-reduction catalytic converter Download PDFInfo
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- CN103244291A CN103244291A CN2013101475323A CN201310147532A CN103244291A CN 103244291 A CN103244291 A CN 103244291A CN 2013101475323 A CN2013101475323 A CN 2013101475323A CN 201310147532 A CN201310147532 A CN 201310147532A CN 103244291 A CN103244291 A CN 103244291A
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Abstract
The invention relates to a self-learning control method for maintaining output speed and torque constant when a lean-burn gasoline engine with an NOx (oxides of nitrogen) adsorber-reduction catalytic converter runs in a lean-burn working state and a rich-burn working state periodically and alternately. In an engine air-fuel ratio periodic step change process, changes of speed and torque output are monitored; when an absolute value of speed fluctuation of an engine is smaller than a set specific value Q, and an absolute value of torque fluctuation is smaller than a set specific value P, an original engine MAP is adopted for running; otherwise, an auxiliary MAP is adopted for running; and the original engine MAP and the auxiliary MAP are in a dynamic adjustment process. By dynamic adjustment of the MAPs, throttle percentage and angle of ignition advance are adjusted optimally; and treatment of NOx by an LNT (lean-NOx-trap) is guaranteed, and comfort of drivers or passengers is also guaranteed.
Description
Technical field
The present invention relates to internal-combustion engine Rarefied combustion tail gas control technique, relate to a kind of gasoline engine periodicity alternate run of being furnished with NOx absorbing and reducing catalytic converter of realizing particularly and when lean-burn working state and dense combustion working state, keep output speed and the constant controlling method of moment of torsion.
Background technique
The petrol engine lean burn technology can improve the fuel economy of petrol engine effectively, and the discharging of reduction HC, CO, yet because the tail gas that motor is discharged is in the atmosphere of oxygen content surplus, make traditional triple effect catalytic converter TWC lose efficacy, can't under oxygen-enriched environment, efficiently remove NOx.This just needs to adopt the exhaust aftertreatment technology to reduce a large amount of NOx dischargings that produce under the lean burn conditions.NOx absorbing and reducing catalytic converter LNT(Lean-NOx-Trap) can reduce the discharging of gasoline engine NOx effectively.Gasoline engine is when adopting NOx absorbing and reducing catalyzed conversion preprocessor LNT work, its periodically alternation in lean-burn working state (NOx adsorptive process) and dense combustion working state (NOx reduction process) so that finish LNT in achieving lean combustion in engine state NOx adsorption and dense combustion state reducing NOx emissions thing process.If merely keep throttle opening constant, only keep certain mixer concentration by fuel injection amount, will inevitably make the external output torque of petrol engine produce bigger fluctuation, cause the bigger variation of engine speed, make the driveability deterioration of vehicle.Therefore need a kind of gasoline engine that can keep when dense rare conversion, to keep external output speed and the constant controlling method of moment of torsion substantially.
Summary of the invention
The objective of the invention is between air-fuel ratio, dense combustion or dense, lean-burn, in the step change procedure, guarantee the Learning Control Method of petrol engine rotational speed and moment of torsion constant output.
The permanent moment of torsion Learning Control Method of gasoline engine of being furnished with NOx absorbing and reducing catalytic converter,
Definition: the MAP figure of rotating speed, moment of torsion and throttle opening be former machine MAP figure during different air fuel ratio A/F, and machine MAP figure in its Central Plains can be divided into again that the dense combustion of former machine MAP schemes and former machine lean-burn MAP schemes; MAP figure with rotating speed, moment of torsion and throttle opening under different air fuel ratio A/F and the different ignition advance angle condition is auxiliary MAP figure, and wherein auxiliary MAP figure can be divided into auxiliary dense combustion MAP figure again and assist lean-burn MAP figure;
Step 1: in the periodic step change procedure of engine air-fuel ratio, monitoring engine speed, moment of torsion output change;
Step 2: when motor switches between rare, dense combustion or dense, lean-burn, at first adopt former machine MAP figure to regulate throttle opening, until the fluctuation absolute value of the rotating speed particular value Q less than certain setting, and the torque ripple absolute value is during less than the particular value P of certain setting; This process is the coarse adjustment process;
Step 3: if the adjusting of step 2 is identical before can not realizing moment of torsion output and switching, adopt auxiliary MAP figure to regulate ignition advance angle, the moment of torsion output after switching between rare, dense combustion or dense, lean-burn is before identical with switching; This process is the thin tuning process;
Described former machine MAP figure, auxiliary MAP figure is in the dynamic adjustment process, when being switched to dense combustion regenerative process by the lean-burn adsorptive process, note the deviation of this process medium speed, with this deviation as input quantity, when motor moves with the lean-burn adsorptive process, when calculating next regenerative process by certain algorithm to the reduction value of air fuel ratio throttle opening and ignition timing, and write down the reduction value of each generation and the deviation of each regenerative process rotating speed, each deviation is compared, and with the rotating speed deviation in qualified wave range the time each reduction value of correspondence store as increment MAP figure, the corresponding reduction value of undesirable deviation is rejected, and rule constantly moves in circles according to this.
If auxiliary rotating speed and the torque curve point of intersection of MAP figure under different ignition advance angles and throttle opening condition exists a plurality of and former machine MAP figure rotating speed and the identical situation in moment of torsion point of intersection, then the MAP of the ignition advance angle that employing and point of intersection same number are maximum schemes.
As preferred version: described Q=50rpm; Described P=5N.m.
During each engine running, optimum deviation and the corresponding reduction value of all storing certain number of times, upper-position unit is analyzed it when shutting down.From cybernatic angle, as long as algorithm is selected for use rationally, above learning process is a process that deviation restrains gradually.Can adopt pid algorithm is the basis, uses for reference the principle of fuzzy control and neuron network, finds optimum algorithm in the process of test gradually.
The present invention is with respect to the advantage of prior art: by the dynamic adjustment of MAP figure, realize the optimal adjustment of throttle opening and ignition advance angle, realized dense, when the phase process is switched, moment of torsion and rotating speed control are in driver's acceptable scope; Both guarantee the processing of the NOx of LNT, also guaranteed driver or motroist's travelling comfort.
Description of drawings
Fig. 1 is the automatically controlled gasoline engine of CA3GA2 transformed among the embodiment 1 at air fuel ratio A/F is that moment of torsion is with the change in rotational speed curve under 12 o'clock each throttle openings, that is: the dense combustion of former machine MAP schemes.
Fig. 2 is that the automatically controlled gasoline engine of transforming among the embodiment 1 of CA3GA2 is 20 o'clock at air fuel ratio A/F, under each throttle opening that obtains by self study moment of torsion with moment of torsion under each throttle opening of change in rotational speed curve with the change in rotational speed curve, that is: former machine lean-burn self study MAP figure.
Embodiment
In the present embodiment: select the automatically controlled gasoline engine of CA3GA2 of transformation, dense combustion air fuel ratio A/F is 12, and lean-burn air fuel ratio A/F is 20; Q=50rpm; P=5N.m.
The permanent moment of torsion Learning Control Method of gasoline engine of being furnished with NOx absorbing and reducing catalytic converter,
Definition: the MAP figure of rotating speed, moment of torsion and throttle opening be former machine MAP figure during different air fuel ratio A/F, and machine MAP figure in its Central Plains can be divided into again that the dense combustion of former machine MAP schemes and former machine lean-burn MAP schemes; MAP figure with rotating speed, moment of torsion and throttle opening under different air fuel ratio A/F and the different ignition advance angle condition is auxiliary MAP figure, and wherein auxiliary MAP figure can be divided into auxiliary dense combustion MAP figure again and assist lean-burn MAP figure;
Step 1: in the periodic step change procedure of engine air-fuel ratio, monitoring engine speed, moment of torsion output change;
Step 2: when motor switches between rare, dense combustion or dense, lean-burn, at first adopt former machine MAP figure to regulate throttle opening, until the fluctuation absolute value of the rotating speed particular value Q less than certain setting, and the torque ripple absolute value is during less than the particular value P of certain setting; This process is the coarse adjustment process;
Step 3: if the adjusting of step 2 is identical before can not realizing moment of torsion output and switching, adopt auxiliary MAP figure to regulate ignition advance angle, the moment of torsion output after switching between rare, dense combustion or dense, lean-burn is before identical with switching; This process is the thin tuning process;
Described former machine MAP figure, auxiliary MAP figure is in the dynamic adjustment process, when dense combustion regenerative process, note the deviation of this process medium speed, with this deviation as input quantity, when motor moves with the lean-burn adsorptive process, when calculating next regenerative process by certain algorithm to the reduction value of air fuel ratio throttle opening and ignition timing, and write down the reduction value of each generation and the deviation of each regenerative process rotating speed, each deviation is compared, and with the rotating speed deviation in qualified wave range the time each reduction value of correspondence store as increment MAP figure, the corresponding reduction value of undesirable deviation is rejected, and rule constantly moves in circles according to this.
Claims (4)
1. the permanent moment of torsion Learning Control Method of gasoline engine of being furnished with NOx absorbing and reducing catalytic converter,
Definition: the MAP figure of rotating speed, moment of torsion and throttle opening be former machine MAP figure during different air fuel ratio A/F, and machine MAP figure in its Central Plains can be divided into again that the dense combustion of former machine MAP schemes and former machine lean-burn MAP schemes; MAP figure with rotating speed, moment of torsion and throttle opening under different air fuel ratio A/F and the different ignition advance angle condition is auxiliary MAP figure, and wherein auxiliary MAP figure can be divided into auxiliary dense combustion MAP figure again and assist lean-burn MAP figure;
It is characterized in that:
Step 1: in the periodic step change procedure of engine air-fuel ratio, monitoring engine speed, moment of torsion output change;
Step 2: when motor switches between rare, dense combustion or dense, lean-burn, at first adopt former machine MAP figure to regulate throttle opening, until the fluctuation absolute value of the rotating speed particular value Q less than certain setting, and the torque ripple absolute value is during less than the particular value P of certain setting; This process is the coarse adjustment process;
Step 3: if the adjusting of step 2 is identical before can not realizing moment of torsion output and switching, adopt auxiliary MAP figure to regulate ignition advance angle, the moment of torsion output after switching between rare, dense combustion or dense, lean-burn is before identical with switching; This process is the thin tuning process;
Described former machine MAP figure, auxiliary MAP figure is in the dynamic adjustment process, when dense combustion regenerative process, note the deviation of this process medium speed, with this deviation as input quantity, when motor moves with the lean-burn adsorptive process, when calculating next regenerative process by certain algorithm to the reduction value of air fuel ratio throttle opening and ignition timing, and write down the reduction value of each generation and the deviation of each regenerative process rotating speed, each deviation is compared, and with the rotating speed deviation in qualified wave range the time each reduction value of correspondence store as increment MAP figure, the corresponding reduction value of undesirable deviation is rejected, and rule constantly moves in circles according to this.
2. according to the described permanent moment of torsion Learning Control Method of gasoline engine of being furnished with NOx absorbing and reducing catalytic converter of claim 1, it is characterized in that: if auxiliary rotating speed and the torque curve point of intersection of MAP figure under different ignition advance angles and throttle opening condition exists a plurality of and former machine MAP figure rotating speed and the identical situation in moment of torsion point of intersection, then the MAP of the ignition advance angle that employing and point of intersection same number are maximum schemes.
3. according to the described permanent moment of torsion Learning Control Method of gasoline engine of being furnished with NOx absorbing and reducing catalytic converter of claim 1, it is characterized in that: described Q=50rpm.
4. according to the described permanent moment of torsion Learning Control Method of gasoline engine of being furnished with NOx absorbing and reducing catalytic converter of claim 1, it is characterized in that: described P=5N.m.
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| CN2013101475323A CN103244291A (en) | 2013-04-25 | 2013-04-25 | Constant-torque self-learning control device of lean-burn gasoline engine with (oxides of nitrogen) adsorber-reduction catalytic converter |
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| CN2013101475323A CN103244291A (en) | 2013-04-25 | 2013-04-25 | Constant-torque self-learning control device of lean-burn gasoline engine with (oxides of nitrogen) adsorber-reduction catalytic converter |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114810287A (en) * | 2021-06-17 | 2022-07-29 | 长城汽车股份有限公司 | Method and system for correcting LNT (Low-Density LNT) aging and vehicle |
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| US20020006848A1 (en) * | 2000-07-11 | 2002-01-17 | Toyota Jidosha Kabushiki Kaisha | Apparatus for controlling vehicle drive system including engine with turbocharger, and lock-up clutch |
| US20040144360A1 (en) * | 2003-01-27 | 2004-07-29 | Ford Global Technologies, Inc. | Lean idle speed control using fuel and ignition timing |
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- 2013-04-25 CN CN2013101475323A patent/CN103244291A/en active Pending
Patent Citations (4)
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| US20020006848A1 (en) * | 2000-07-11 | 2002-01-17 | Toyota Jidosha Kabushiki Kaisha | Apparatus for controlling vehicle drive system including engine with turbocharger, and lock-up clutch |
| US20040144360A1 (en) * | 2003-01-27 | 2004-07-29 | Ford Global Technologies, Inc. | Lean idle speed control using fuel and ignition timing |
| CN1969118A (en) * | 2004-06-15 | 2007-05-23 | 本田技研工业株式会社 | Internal combustion engine control device |
| CN101018939A (en) * | 2005-05-31 | 2007-08-15 | 丰田自动车株式会社 | Air-fuel ratio control device for internal combustion engine |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114810287A (en) * | 2021-06-17 | 2022-07-29 | 长城汽车股份有限公司 | Method and system for correcting LNT (Low-Density LNT) aging and vehicle |
| CN114810287B (en) * | 2021-06-17 | 2023-07-07 | 长城汽车股份有限公司 | Method, system and vehicle for correcting LNT aging |
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Application publication date: 20130814 |