CN112682183B - Control method for wrap angle and valve overlap angle of engine intake valve - Google Patents
Control method for wrap angle and valve overlap angle of engine intake valve Download PDFInfo
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- CN112682183B CN112682183B CN201910989219.1A CN201910989219A CN112682183B CN 112682183 B CN112682183 B CN 112682183B CN 201910989219 A CN201910989219 A CN 201910989219A CN 112682183 B CN112682183 B CN 112682183B
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
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- Y02T10/12—Improving ICE efficiencies
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Abstract
The invention provides a control method of an engine intake valve wrap angle and a valve overlap angle, and the determination method comprises the following steps: detecting the rotating speed of the engine; when the engine speed is in a preset speed threshold interval, gradually adjusting an intake valve wrap angle and a valve overlap angle of the engine at preset intervals; and controlling the actions of an intake valve and an exhaust valve of the engine according to the adjusted wrap angle of the intake valve and the adjusted overlap angle of the valve. The determining method can reasonably determine the wrap angle and the valve overlap angle of the intake valve of the engine, thereby reducing the intake temperature of the catalyst, reducing the content of exhaust pollutants of the engine and reducing the oil consumption of the engine.
Description
Technical Field
The invention relates to the technical field of engine control, in particular to a control method for an inlet valve wrap angle and a valve overlap angle of an engine.
Background
The automobile industry is the most main consumer of petrochemical energy, and meanwhile, automobile exhaust is also an important source of atmospheric pollutants, so the automobile industry still faces greater pressure of energy conservation and emission reduction. CVVL (continuous valve lift adjustment) is one of the more advanced technologies used in engines, which has certain benefits on engine oil consumption and emission, but how to use CVVL in different working conditions is still a more prominent technical problem. The existing CVVL system usually uses the maximum lift and the maximum wrap angle in order to improve the air inflow and the air charging efficiency near the low-speed external characteristic working condition, and the corresponding VVT control also tends to use a larger valve overlap angle.
Disclosure of Invention
In view of the above, the present invention is directed to a method for controlling an engine intake valve wrap angle and a valve overlap angle, so as to improve the thermal efficiency of the engine and reduce the engine emissions.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
a method for controlling an engine intake valve wrap angle and valve overlap angle, comprising:
detecting the rotating speed of the engine;
when the engine speed is in a preset speed threshold interval, gradually adjusting an intake valve wrap angle and a valve overlap angle of the engine at preset intervals;
and controlling the actions of an intake valve and an exhaust valve of the engine according to the adjusted inlet valve wrap angle and the adjusted valve overlap angle.
Further, the controlling the actions of the intake valve and the exhaust valve of the engine according to the adjusted intake valve wrap angle and the adjusted valve overlap angle comprises the following steps:
acquiring the exhaust pollutant content and/or the exhaust catalyst inlet temperature corresponding to the inlet valve wrap angle and the valve overlap angle of the engine which are adjusted at preset intervals each time;
and comparing the exhaust pollutant content and/or the exhaust catalyst inlet temperature corresponding to the inlet valve wrap angle and the valve overlap angle of the engine which are adjusted at preset intervals each time, determining the inlet valve wrap angle and the valve overlap angle corresponding to the lowest exhaust pollutant content or the lowest exhaust catalyst inlet temperature as the inlet valve wrap angle and the valve overlap angle of the engine, and controlling the actions of an inlet valve and an exhaust valve of the engine.
Further, the controlling the actions of the intake valve and the exhaust valve of the engine according to the adjusted intake valve wrap angle and the adjusted valve overlap angle comprises the following steps:
acquiring the exhaust pollutant content and/or the exhaust catalyst inlet air temperature corresponding to the inlet valve wrap angle and the valve overlap angle of the engine which are adjusted at preset intervals each time; and when the exhaust pollutant content or the intake temperature of the exhaust catalyst meets a preset condition, controlling the actions of an intake valve and an exhaust valve of the engine according to the adjusted intake valve wrap angle and valve overlap angle of the engine.
Further, the preset rotation speed threshold interval is below 1500 rpm.
Further, the inlet valve wrap angle is decreased gradually according to the preset interval from the maximum inlet valve wrap angle of the engine.
Further, the preset interval is 5 degrees CA, and the maximum reduction of the wrap angle of the intake valve is 15-20 degrees CA.
Further, the advance angle of the intake valve in the valve overlap angle is started from 30 DEG CA and is decreased at intervals of 5 DEG CA; the maximum reduction amount of the advance angle of the intake valve is below 10-15 DEG CA.
Further, the exhaust valve retard angle in the valve overlap angle is started from 30 ° CA and decreases at intervals of 5 ° CA.
Further, the maximum decrease in the exhaust valve retard angle is between 5 and 10 ° CA.
Further, before controlling the actions of the intake valve and the exhaust valve of the engine according to the adjusted intake valve wrap angle and the adjusted valve overlap angle, the method further comprises the following steps:
detecting a vibration frequency of a supercharger of the engine;
and when the vibration frequency of the supercharger is lower than the surging judgment frequency of the supercharger, controlling the actions of an intake valve and an exhaust valve of the engine according to the adjusted wrap angle of the intake valve and the valve overlap angle.
Compared with the prior art, the invention has the following advantages:
the invention provides a control method of an engine intake valve wrap angle and a valve overlap angle, which comprises the steps of adjusting the intake valve wrap angle and the valve overlap angle of an engine at preset intervals in a preset rotating speed threshold interval, and controlling the actions of an intake valve and an exhaust valve of the engine according to the adjusted intake valve wrap angle and the adjusted valve overlap angle. The exhaust catalytic converter can reduce the pollutant content discharged by the engine, reduce the air inlet temperature of the exhaust catalytic converter and improve the heat efficiency of the engine, thereby being beneficial to the energy conservation and emission reduction of vehicles.
Detailed Description
It should be noted that the embodiments and features of the embodiments of the present invention may be combined with each other without conflict.
Example one
The embodiment relates to a control method of an engine intake valve wrap angle and a valve overlap angle, which comprises the following steps: detecting the rotating speed of the engine; when the rotating speed of the engine is in a preset rotating speed threshold interval, reducing an intake valve wrap angle and a valve overlap angle of the engine at preset intervals; and controlling the actions of an intake valve and an exhaust valve of the engine according to the adjusted wrap angle of the intake valve and the adjusted overlap angle of the valve.
Controlling intake and exhaust valve events of the engine based on the adjusted intake valve wrap angle and valve overlap angle comprises: acquiring the exhaust pollutant content and/or the exhaust catalyst inlet temperature corresponding to the inlet valve wrap angle and the valve overlap angle of the engine which are adjusted at preset intervals each time; and comparing the exhaust pollutant content and/or the exhaust catalyst inlet temperature corresponding to the inlet valve wrap angle and the valve overlap angle of the engine which are adjusted at preset intervals each time, determining the inlet valve wrap angle and the valve overlap angle corresponding to the lowest exhaust pollutant content or the lowest exhaust catalyst inlet temperature as the inlet valve wrap angle and the valve overlap angle of the engine, and controlling the actions of an inlet valve and an exhaust valve of the engine.
The control method of the intake valve wrap angle and the valve overlap angle of the engine of the embodiment is applied to the direct injection gasoline engine with an intake CVVL system and a VVT system, the intake CVVL system can realize the continuous adjustment of the intake valve wrap angle between 100 DEG CA and 200 DEG CA, and the control method of the intake valve wrap angle and the valve overlap angle of the engine is preferably applied to the characteristic interval of the engine outside the low speed, for example, the rotation speed threshold interval of the engine is below 1500 rpm.
In general, for an in-cylinder direct injection gasoline engine with an intake CVVL system and a VVT system, when the engine works in different rotating speed and load intervals, the adopted valve wrap angle and the adopted lift range are different, and in the prior art, when the engine works in a low-speed external characteristic interval, the control strategy of the engine usually adopts the maximum wrap angle and the maximum lift range, meanwhile, the advanced opening angle of an intake valve compared with the installation phase is 15-30 CA, the delayed closing angle of an exhaust valve compared with the installation phase is 20-30 CA, and the valve overlap angle is 35-60 CA.
Based on the existing control strategy, because the supercharging pressure of the supercharger is high, the intake pressure is higher than the back pressure of the exhaust, the engine forms a relatively obvious scavenging process at a low-speed external characteristic point, the mixed gas which is not fully combusted in the cylinder is scavenged by the scavenging process, so that the original emission of hydrocarbon and carbon monoxide is higher, and meanwhile, the fresh charge and the mixed gas which is not fully combusted react near a vehicle catalyst to further release heat, and the temperature limit which can be born by the catalyst can be exceeded. In addition, since part of the mixture is discharged by the scavenging process without being fully combusted, more fuel is required to ensure the load output of the engine, and the fuel consumption of the engine is increased. Generally speaking, the control strategy of the existing engine is not beneficial to energy conservation and emission reduction of the vehicle, and can reduce the service life of the exhaust catalyst.
On the basis, the inventor provides the control method for the inlet valve wrap angle and the valve overlap angle of the engine for how to set the inlet valve wrap angle and the valve overlap angle so as to reduce the temperature of a catalyst, avoid exceeding the temperature limit value of the catalyst and be beneficial to energy conservation and emission reduction of vehicles.
Specifically, the engine speed is detected, when the engine speed is in the threshold interval, the intake valve wrap angle and the valve overlap angle of the engine are adjusted successively at preset intervals, for example, the intake valve wrap angle is decreased from the maximum intake valve wrap angle of the engine at preset intervals, when the valve overlap angle is adjusted, the intake valve advance angle in the valve overlap angle is decreased from 30 ° CA at preset intervals, and the exhaust valve retard angle in the valve overlap angle is decreased from 30 ° CA at preset intervals.
Through the adjustment, the combination of a plurality of groups of inlet valve wrap angles and valve overlap angles is obtained, the exhaust pollutant content and/or the exhaust catalyst inlet temperature corresponding to each group of inlet valve wrap angles and valve overlap angles are detected, and the inlet valve wrap angle and the valve overlap angle corresponding to the lowest exhaust pollutant content and/or exhaust catalyst inlet temperature are determined as the inlet valve wrap angle and the valve overlap angle of the engine.
In order to reduce the test workload and obtain a better combination of the intake valve wrap angle and the valve overlap angle, each of the preset intervals is preferably 5 ° CA, and the maximum reduction of the intake valve wrap angle is between 15 ° CA and 20 ° CA, the maximum reduction of the intake valve advance angle is between 10 ° CA and 15 ° CA, and the maximum reduction of the intake valve retard angle is preferably between 5 ° CA and 10 ° CA.
According to the above-described determination method of the present invention, a specific embodiment thereof is as follows:
in this embodiment, the engine speed is adjusted to a preset speed threshold interval, which is below 1500 rpm.
a. The intake valve wrap angle was adjusted to 200 CA.
a1. Setting an advance angle of an inlet valve as 30-degree CA, and sequentially measuring the content C1-C3 of engine exhaust pollutants and/or the inlet temperature T1-T3 of an exhaust catalyst when an exhaust valve delay-closing angle is 30-degree CA, 25-degree CA and 20-degree CA;
a2. setting an advance angle of an intake valve to be 25 CA, and sequentially measuring the content C4-C6 of engine exhaust pollutants and/or the intake temperature T4-T6 of an exhaust catalyst when a delay closing angle of an exhaust valve is 30 CA, 25 CA and 20 CA;
a3. setting an advance angle of an intake valve to be 20 CA, and sequentially measuring the content C7-C9 of engine exhaust pollutants and/or the intake temperature T7-T9 of an exhaust catalyst when a delay closing angle of an exhaust valve is 30 CA, 25 CA and 20 CA;
a4. setting an advance angle of an inlet valve as 15 degrees CA, and sequentially measuring the content C10-C12 of engine exhaust pollutants and/or the inlet temperature T10-T12 of an exhaust catalyst when an exhaust valve delay closing angle is 30 degrees CA, 25 degrees CA and 20 degrees CA.
b. The intake valve wrap angle was adjusted to 195 CA.
And repeating the steps a1 to a4, and measuring the exhaust pollutant content C13 to C24 of the engine and/or the inlet air temperature T13 to T24 of the exhaust catalyst.
c. The intake valve wrap angle was adjusted to 190 ° CA.
And repeating the steps a1 to a4, and measuring the exhaust pollutant content C25 to C36 of the engine and/or the inlet air temperature T25 to T36 of the exhaust catalyst.
d. The inlet valve wrap angle was adjusted to 185 CA.
And repeating the steps a1 to a4, and measuring the exhaust pollutant content C37 to C48 of the engine and/or the inlet air temperature T37 to T48 of the exhaust catalyst.
e. The intake valve wrap angle is adjusted to 180 CA.
And repeating the steps a1 to a4, and measuring the exhaust pollutant content C49 to C60 of the engine and/or the inlet air temperature T49 to T60 of the exhaust catalyst.
In the above measurement process, if only C1-C60 are measured, the intake valve wrap angle and the valve overlap angle corresponding to the minimum value among C1-C60 are determined as the intake valve wrap angle and the valve overlap angle of the engine. If only T1-T60 is measured, the intake valve wrap angle and the valve overlap angle corresponding to the minimum value of T1-T60 are determined as the intake valve wrap angle and the valve overlap angle of the engine. If C1-C60 and T1-T60 are measured simultaneously, the intake valve wrap angle and the valve overlap angle corresponding to the minimum value of C1-C60 are determined as the intake valve wrap angle and the valve overlap angle of the engine, or the intake valve wrap angle and the valve overlap angle corresponding to the minimum value of T1-T60 are determined as the intake valve wrap angle and the valve overlap angle of the engine.
In order to ensure that the supercharger does not surge, the method for controlling the inlet valve wrap angle and the valve overlap angle of the engine preferably further comprises measuring the vibration frequency of the supercharger, so that when the vibration frequency of the supercharger is lower than the surge occurrence frequency of the supercharger, the inlet valve wrap angle and the valve overlap angle corresponding to the lowest exhaust pollutant content or the inlet air temperature of an exhaust catalyst are determined as the inlet valve wrap angle and the valve overlap angle of the engine.
Specifically, for example, when the above-described measurement of C1-C60 and/or T1-T60 is performed, the detection of the vibration frequency F1-F60 of the supercharger is added, and the intake valve wrap angle and the valve overlap angle corresponding to the minimum value of C1-C60 or T1-T60, which is lower than the surge judgment frequency of the supercharger in F1-F60, are determined as the intake valve wrap angle and the valve overlap angle of the engine.
In the actual test process, compared with the air inlet temperature of the existing catalyst, the air inlet temperature of the catalyst can be reduced by 80-90 ℃ through the air inlet valve wrap angle and the valve overlap angle determined by the determining method, and the oil consumption of an engine can be reduced by 20-25g/kwh.
Example two
The embodiment relates to a control method of an engine intake valve wrap angle and a valve overlap angle, which has the same steps as the scheme of the first embodiment, and the difference lies in that: in this embodiment, the controlling the intake and exhaust valve actions of the engine according to the adjusted intake valve wrap angle and valve overlap angle comprises: acquiring the exhaust pollutant content and/or the exhaust catalyst inlet air temperature corresponding to the inlet valve wrap angle and the valve overlap angle of the engine which are adjusted at preset intervals each time; and when the content of the exhaust pollutants or the intake temperature of the exhaust catalyst meets a preset condition, controlling the actions of an intake valve and an exhaust valve of the engine according to the adjusted wrap angle and overlap angle of the intake valve of the engine.
Namely, values meeting the preset exhaust pollutant content and/or the exhaust catalyst inlet air temperature are selected from the measurement results C1-C60 and/or T1-T60, and the inlet valve wrap angle and the valve overlap angle corresponding to the values are determined as the inlet valve wrap angle and the valve overlap angle of the engine.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (8)
1. A method for controlling an engine intake valve wrap angle and a valve overlap angle, comprising:
detecting the rotating speed of the engine;
when the engine speed is in a preset speed threshold interval, adjusting an inlet valve advance angle and an exhaust valve delay angle in an inlet valve wrap angle and a valve overlap angle of the engine for multiple times at preset intervals;
controlling the actions of an intake valve and an exhaust valve of the engine according to the adjusted wrap angle of the intake valve and the adjusted valve overlap angle;
wherein said controlling intake and exhaust valve events of the engine based on said adjusted intake valve wrap angle and said adjusted valve overlap angle comprises:
acquiring the exhaust pollutant content and/or the exhaust catalyst inlet temperature corresponding to the inlet valve wrap angle and the valve overlap angle of the engine which are adjusted at preset intervals each time;
comparing the exhaust pollutant content and/or the exhaust catalyst inlet temperature corresponding to the inlet valve wrap angle and the valve overlap angle of the engine which are adjusted at preset intervals each time, determining the inlet valve wrap angle and the valve overlap angle corresponding to the lowest exhaust pollutant content or the lowest exhaust catalyst inlet temperature as the inlet valve wrap angle and the valve overlap angle of the engine, and controlling the action of an inlet valve and an exhaust valve of the engine;
alternatively, the controlling the intake and exhaust valve events of the engine based on the adjusted intake valve wrap angle and valve overlap angle comprises:
acquiring the exhaust pollutant content and/or the exhaust catalyst inlet air temperature corresponding to the inlet valve wrap angle and the valve overlap angle of the engine which are adjusted at preset intervals each time; and when the content of the exhaust pollutants or the intake temperature of the exhaust catalyst meets a preset condition, controlling the actions of an intake valve and an exhaust valve of the engine according to the adjusted wrap angle and overlap angle of the intake valve of the engine.
2. The engine intake valve wrap angle and valve overlap angle control method of claim 1, characterized in that: the preset rotating speed threshold interval is below 1500 rpm.
3. The engine intake valve wrap angle and valve overlap angle control method of claim 2, characterized in that: and the inlet valve wrap angle is decreased progressively according to the preset interval from the maximum inlet valve wrap angle of the engine.
4. The engine intake valve wrap angle and valve overlap angle control method of claim 3, characterized in that: the preset interval is 5 DEG CA, and the maximum reduction of the wrap angle of the intake valve is 15-20 DEG CA.
5. The engine intake valve wrap angle and valve overlap angle control method of claim 2, characterized in that: the advance angle of the intake valve in the valve overlap angle is started from 30 degrees CA and is decreased at intervals of 5 degrees CA; the maximum reduction of the advance angle of the inlet valve is between 10 and 15 DEG CA.
6. The engine intake valve wrap angle and valve overlap angle control method of claim 2, characterized in that: the exhaust valve retard angle in the valve overlap angle is started from 30 ° CA and decreases at intervals of 5 ° CA.
7. The engine intake valve wrap angle and valve overlap angle control method according to claim 6, characterized in that: the maximum reduction in the exhaust valve retard angle is between 5 and 10 CA.
8. The engine intake valve wrap angle and valve overlap angle control method according to any one of claims 1 to 7, characterized in that: before the control of the actions of the intake valve and the exhaust valve of the engine according to the adjusted intake valve wrap angle and the adjusted valve overlap angle, the method further comprises the following steps:
detecting a vibration frequency of a supercharger of the engine;
and when the vibration frequency of the supercharger is lower than the surging judgment frequency of the supercharger, controlling the actions of an intake valve and an exhaust valve of the engine according to the adjusted wrap angle of the intake valve and the valve overlap angle.
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