CN114776450B - Variable valve timing control method and system of engine, engine and automobile - Google Patents
Variable valve timing control method and system of engine, engine and automobile Download PDFInfo
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- CN114776450B CN114776450B CN202210232382.5A CN202210232382A CN114776450B CN 114776450 B CN114776450 B CN 114776450B CN 202210232382 A CN202210232382 A CN 202210232382A CN 114776450 B CN114776450 B CN 114776450B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D13/00—Controlling the engine output power by varying inlet or exhaust valve operating characteristics, e.g. timing
- F02D13/02—Controlling the engine output power by varying inlet or exhaust valve operating characteristics, e.g. timing during engine operation
- F02D13/0203—Variable control of intake and exhaust valves
- F02D13/0215—Variable control of intake and exhaust valves changing the valve timing only
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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
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/12—Improving ICE efficiencies
Abstract
The invention relates to a variable valve timing control method, a variable valve timing control system, an engine and an automobile of the engine, wherein the method comprises the steps of obtaining a required load and an actual load under the current working condition from an engine electric control management system; comparing the required load and the actual load with a first load threshold value and a second load threshold value, and selecting the actual load by a load shaft of the VVT pulse spectrum table if the required load and the actual load are smaller than or equal to the first load threshold value; if the load values are all larger than the second load threshold value, the load shaft of the VVT pulse spectrum table selects the required load under the current working condition; if the load values are larger than the first load threshold value and smaller than or equal to the second load threshold value, whether the absolute value of the difference value between the required load and the actual load is smaller than the difference threshold value is judged, if yes, the actual load value is selected by the input of the load shaft of the VVT pulse spectrum table, otherwise, the required load value is selected by the input of the load shaft of the VVT pulse spectrum table; and transmitting the result to an engine electric control management system to further obtain the current optimal VVT operation value. The invention provides a vehicle capable of exerting the best performance of an engine to the greatest extent.
Description
Technical Field
The invention relates to the technical field of automobiles, in particular to the technical field of engines.
Background
In the current engine control strategy, the optimal intake and exhaust VVT pulse table adopts a three-dimensional table based on rotating speed and load, wherein the load axis variable can only be selected from the required load and the actual load in the current state of the engine.
In the calibration process of the optimal VVT, a stable working condition (fixed rotating speed and fixed actual load) is usually operated on a rack, various data under different air intake and exhaust combinations, such as inflation efficiency, fuel consumption rate, gas emission, PM/PN emission, combustion stability and the like, are recorded, and then a group of VVT values with optimal comprehensive effects, such as dynamic property, economic system, emission, combustion stability and the like, are respectively used as an optimal air intake phase value and an optimal exhaust phase value of the working condition point to be filled into a corresponding three-dimensional table. That is, the optimal VVT value in the current VVT three-dimensional table is the optimal value under the corresponding actual load. However, if the actual load is used to select the VVT value, in the process of low-load outward characteristic operation, the actual load cannot reach the maximum value, so that the VVT cannot reach the optimum value of the outward characteristic all the time, and the outward characteristic performance cannot reach the standard. Conversely, when it is necessary to change from the external characteristic load to the low load, the actual load changes slowly, and the VVT cannot be changed quickly to the VVT value required for the low load. Therefore, the current VVT control strategies all select the required load as the load axis variable of the VVT three-dimensional table. However, when the difference between the required load and the actual load is too large in a high transient state, the VVT value calculated by looking up the VVT pulse spectrum table through the required load is not the optimal VVT value under the actual load at the moment, which can cause fuel consumption, emission and combustion to be deteriorated.
Patent document CN110966063B discloses a control method and a device for a variable valve timing system of a miller cycle engine, wherein in the control method, a first VVTMAP MAP targeting economy and a second VVT MAP targeting dynamics are calibrated in advance, and when the engine is in a steady-state working condition operation state, the variable valve timing system is controlled by using the first VVTMAP MAP, so that the economy of the engine is realized; when the engine is in a transient acceleration loading working condition running state, the variable valve timing system is controlled by utilizing the second VVT MAP, so that the dynamic property of the engine is realized, and when the working conditions of the engine are different, different VVT MAP are selected to control the variable valve timing system. In the method, the second VVT map is calibrated and selected under a steady-state working condition, the actual load value is used as the input value of the load shaft of the second VVT map, otherwise, if the required load is the input value of the load shaft of the second VVT map, under the transient condition, when the difference between the required load and the actual load is larger, the VVT operation value obtained by the second VVT map is calculated by interpolation according to the required load value, and is not necessarily the optimal VVT operation value of the wanted power. Therefore, according to the strategy of the method, the actual load is used as the input value of the load shaft to select the VVT operation value, and in the transient acceleration loading process of the low-load outward characteristic operation, the VVT can not reach the external characteristic optimal value all the time because the actual load can not reach the maximum value, and the external characteristic performance can not reach the standard. And according to the strategy of the method, after the transient acceleration loading process is finished, if the engine stably operates under the external characteristic working condition, the VVT can select a steady-state first VVT pulse spectrum and economically operate the VVT, which is opposite to the power requirement of a driver under the external characteristic. In addition, according to this method, when the characteristic load changes to a low load outside the rapid deceleration condition, the actual load changes slowly, so that the VVT operation value cannot be changed quickly to the VVT value required for the low load.
Disclosure of Invention
The invention aims to provide a variable valve timing control method of an engine, which aims to solve the problem that the optimal VVT can not be selected in both steady-state and transient processes in the existing engine control strategy; the second object is to provide an engine variable valve timing control system based on the above engine variable valve timing control method; a third object is to provide an engine; the fourth purpose is to provide an automobile.
In order to achieve the above purpose, the technical scheme adopted by the invention is as follows:
a method for controlling the variable valve timing of an engine,
acquiring a required load and an actual load under the current working condition from an engine electric control management system;
determining a first load threshold and a second load threshold based on the maximum actual load achievable at each rotational speed, wherein the first load threshold is less than the second load threshold;
if the required load and the actual load under the current working condition are smaller than or equal to the first load threshold value, the input value of the load shaft of the VVT pulse spectrum table selects the actual load under the current working condition;
if the required load and the actual load under the current working condition are both larger than the second load threshold value, the input value of the load shaft of the VVT pulse spectrum table selects the required load under the current working condition;
if the required load and the actual load under the current working condition are both larger than the first load threshold and smaller than or equal to the second load threshold, judging whether the absolute value of the difference value between the required load and the actual load under the current working condition is smaller than the difference threshold, if so, selecting the actual load under the current working condition by the input value of the load shaft of the VVT pulse spectrum table, otherwise, selecting the required load under the current working condition by the input value of the load shaft of the VVT pulse spectrum table;
and obtaining the current optimal VVT running value through interpolation calculation, outputting and controlling the engine.
According to the technical means, the degree of approaching the external characteristics between the demand load and the actual load can be obtained through the comparison between the demand load and the actual load and the first load value and the second load value under the current working condition, if the demand load and the actual load are smaller than or equal to the first load value, the actual load is not approaching the external characteristics, the actual load is adopted, further the engine can be ensured to operate at the most economical VVT value, if the actual load is larger than or equal to the second load value, the degree of approaching the external characteristics is higher, the external characteristic torque is required to be reached quickly, therefore, the absolute value of the difference value of the demand load and the actual load is required to be judged when the demand load is larger than the first load value and smaller than the second load value, if the absolute value of the difference value of the demand load and the actual load is smaller than the difference value, the actual load is adopted, if the absolute value of the difference value of the two is larger than or equal to the difference value, the difference value of the actual load is larger, and the demand load is adopted in order to reach the external characteristic torque quickly.
Further, the first load threshold is X% of the maximum actual load achievable at each rotational speed, the X value is defined as a medium load, and the first load threshold is variable according to the rotational speed. If the demand load is less than X%, this means that the driver's demand for economy is more important than the power demand. Preferably, the X% value is 50-70%.
Further, the second load threshold is Y which is the maximum practical load achievable at each rotational speed, and the Y value is defined as a large load and is also variable according to the rotational speed. If the demand load is greater than Y%, this means that the driver's demand for dynamic performance is more important than the economic requirement, and preferably the Y% value is 90-95%.
Further, the difference threshold is 3% -10%, and is variable according to the rotating speed.
Further, the current demand load is the in-cylinder demand charge calculated by the electronic control management system based on the driver pedal torque demand.
Further, the current actual load is the actual inflation quantity in the current cylinder calculated by the electronic control management system according to the information of the existing load sensor.
A system implementing the above-described engine variable valve timing control method, comprising;
the information acquisition unit is configured to acquire the required load and the actual load under the current working condition in real time through the electric control management system.
The input value selection control unit of the VVT pulse spectrum axis is configured to acquire a proper load, wherein the proper load is a required load under the current working condition or an actual load under the current working condition.
And the VVT operation value calculation unit is configured to receive the proper load, take the proper load as the input of a load shaft of a VVT pulse spectrum, interpolate and calculate the current VVT operation value, and then output the current VVT operation value to control the engine.
Further, the input value selection control unit of the VVT pulse spectrum axis includes an information receiving module, a determining module and an information transmitting module, wherein:
the information receiving module is configured to receive the demand load and the actual load under the current working condition transmitted by the information acquisition unit;
the judging module is configured to determine the proper load based on the required load under the current working condition, the actual load under the current working condition, the first load threshold value, the second load threshold value and the difference threshold value;
the information transfer module is configured to receive the appropriate load determined by the determination module and transfer the appropriate load to the VVT running value calculation unit.
Further, the decision module determines that the appropriate load has the following three choices:
if the required load and the actual load under the current working condition are smaller than or equal to the first load threshold value, the input value of the load shaft of the VVT pulse spectrum table selects the actual load under the current working condition;
if the required load and the actual load under the current working condition are both larger than the second load threshold value, the input value of the load shaft of the VVT pulse spectrum table selects the required load under the current working condition;
if the required load and the actual load under the current working condition are both larger than the first load threshold and are both smaller than or equal to the second load threshold, judging whether the absolute value of the difference value between the required load and the actual load under the current working condition is smaller than the difference threshold, if so, selecting the actual load under the current working condition by the input value of the load shaft of the VVT pulse spectrum table, otherwise, selecting the required load under the current working condition by the input value of the load shaft of the VVT pulse spectrum table.
An engine includes the above engine variable valve timing control system.
An automobile comprises a body, wherein the engine is integrated with the body.
The invention has the beneficial effects that:
according to the technology provided by the invention, under various working conditions, the VVT value can be selected according to the information such as the actual size of the required load and the actual load, the difference value between the required load and the actual load, the degree of approaching the external characteristics of the required load and the actual load, and the like, and the optimal load information serving as the VVT pulse spectrum load axis is selected at the moment, namely, different load values are selected according to different conditions to serve as the input value of the VVT pulse spectrum load axis, so that the optimal performance of the engine can be furthest exerted. Specifically, a basic economic operation area is determined by setting a first load threshold value, a dynamic operation area is determined by setting a second load threshold value, the area between the first load threshold value and the dynamic operation area is determined, the driving requirement is determined to be an economic or dynamic request by setting a difference threshold value between a required load and an actual load, and a proper load value is selected as a load coordinate in a VVT map.
Drawings
FIG. 1 is a detailed schematic diagram of a VVT pulse spectrum load axis selection process according to an embodiment of the invention;
fig. 2 is a schematic diagram of a control strategy according to an embodiment of the present invention.
FIG. 3 is a system control diagram of an embodiment of the present invention.
Detailed Description
Further advantages and effects of the present invention will become readily apparent to those skilled in the art from the disclosure herein, by referring to the following description of the embodiments of the present invention with reference to the accompanying drawings and preferred examples. The invention may be practiced or carried out in other embodiments that depart from the specific details, and the details of the present description may be modified or varied from the spirit and scope of the present invention. It should be understood that the preferred embodiments are presented by way of illustration only and not by way of limitation.
It should be noted that the illustrations provided in the following embodiments merely illustrate the basic concept of the present invention by way of illustration, and only the components related to the present invention are shown in the drawings and are not drawn according to the number, shape and size of the components in actual implementation, and the form, number and proportion of the components in actual implementation may be arbitrarily changed, and the layout of the components may be more complicated.
Example 1
The present embodiment proposes a variable valve timing control method for an engine, configured to obtain an optimal VVT running value, as shown in fig. 1 and 2, specifically:
the method comprises the steps of obtaining a required load and an actual load under the current working condition from an engine electronic control management system (EMS), wherein the current required load is an in-cylinder required inflation quantity calculated by a basic torque structure of the electronic control management system, and the current actual load is a current in-cylinder actual inflation quantity calculated by the electronic control management system according to the information of an existing load sensor.
Determining a first load threshold and a second load threshold, wherein the first load threshold is smaller than the second load threshold, in this embodiment, the first load threshold is 50-70% of the maximum practical load achievable at each rotation speed, the values are different according to the rotation speeds, within the load, driving requirements are mainly economic requirements, and the driving requirements belong to economic operation conditions, so as to ensure that the load operates at the most economical VVT value.
The second load threshold is 90-95% of the maximum practical load which can be achieved at each rotating speed, the value is different according to the rotating speeds, and beyond the range, the driving requirement is mainly the power requirement and belongs to the power operation working condition, so that the external characteristics of each rotating speed and the working conditions nearby the rotating speed are ensured, and the operation is carried out according to the expected VVT value, so that the external characteristics can be ensured to be achieved quickly.
And comparing the required load and the actual load under the current working condition with the first load threshold value and the second load threshold value, and if the required load and the actual load under the current working condition are smaller than or equal to the first load threshold value, selecting the actual load under the current working condition by the input value of the load shaft of the VVT pulse spectrum table, so that the most economical VVT value can be realized.
If the required load and the actual load under the current working condition are both larger than the first load threshold and are both smaller than or equal to the second load threshold, whether the absolute value of the difference value between the required load and the actual load under the current working condition is smaller than the difference threshold is judged, if yes, the actual load under the current working condition is selected by the input value of the load shaft of the VVT pulse spectrum table, otherwise, the required load under the current working condition is selected by the input value of the load shaft of the VVT pulse spectrum table, and the external characteristic torque can be quickly achieved.
The range of the difference threshold is 3% -10%, and the difference threshold is determined according to the transient actual performance of the whole vehicle. The purpose is to reduce the input value of the load axis of the VVT pulse spectrum table, and when switching between the required load and the actual load, the output value of the VVT pulse spectrum fluctuates excessively.
And if the required load and the actual load under the current working condition are both larger than the second load threshold, selecting the required load under the current working condition by the input value of the load shaft of the VVT pulse spectrum table.
And finally selecting the input value of the load shaft of the VVT pulse spectrum table (the required load or the actual load under the current working condition) and transmitting the selected value to an engine electronic control management system (EMS), and calculating the current optimal VVT operation value by the engine electronic control management system (EMS) based on the required load or the actual load under the current working condition.
Example 2
The embodiment provides an engine variable valve timing control system, as shown in fig. 3, which comprises an information acquisition unit configured to acquire a required load and an actual load under a current working condition in real time through an electric control management system;
the VVT pulse spectrum axis input value selection control unit is configured to select a proper load, wherein the proper load is a required load under the current working condition or an actual load under the current working condition;
the input value selection control unit of the VVT pulse spectrum axis is the core of the system for obtaining the optimal VVT operation value, and is mainly used for obtaining proper load, wherein the proper load is the required load or the actual load under the current working condition,
the VVT pulse spectrum axis input value selection control unit comprises an information receiving module, a judging module and an information transmission module, wherein the information receiving module is configured to receive the demand load and the actual load under the current working condition transmitted by the information acquisition unit;
the judging module is configured to determine the proper load based on the required load under the current working condition, the actual load under the current working condition, the first load threshold, the second load threshold and the difference threshold, and the judging method specifically comprises the following steps:
if the required load and the actual load of the current working condition are smaller than or equal to a first load threshold value, the input value of a load shaft of the VVT pulse spectrum table selects the required load under the current working condition; if the required load and the actual load are both larger than the first load threshold and smaller than or equal to the second load threshold, and meanwhile, the absolute value of the difference value between the required load and the actual load is larger than the difference threshold, the input value of the load shaft of the VVT pulse spectrum table selects the required load under the current working condition, and if the required load and the actual load are smaller than or equal to the difference threshold, the input value of the load shaft of the VVT pulse spectrum table selects the actual load under the current working condition; and if the required load and the actual load of the current working condition are both larger than the second load threshold, selecting the required load under the current working condition by the input value of the load shaft of the VVT pulse spectrum table.
The information delivery module is configured to receive the appropriate load determined by the determination module and deliver the appropriate load to the information delivery unit.
The information transmission unit is configured to receive a proper load and transmit the proper load to the engine electronic control management system, and the engine electronic control management system interpolates and calculates a current VVT operation value by taking the proper load as an input value of a load shaft of a VVT pulse spectrum, wherein the VVT operation value is an optimal VVT operation value, and the engine can be output and controlled.
Example 3
The present embodiment also proposes an engine provided with the above-described engine variable valve timing control system.
Example 4
The embodiment also provides an automobile, which comprises an automobile body, wherein the engine is integrated on the automobile body.
The above embodiments are merely preferred embodiments for fully explaining the present invention, and the scope of the present invention is not limited thereto. Equivalent substitutions and modifications will occur to those skilled in the art based on the present invention, and are intended to be within the scope of the present invention.
Claims (18)
1. An engine variable valve timing control method characterized by:
acquiring a demand load and an actual load under the current working condition;
determining a first load threshold and a second load threshold based on the maximum actual load achievable at each rotational speed, wherein the first load threshold is less than the second load threshold;
if the required load and the actual load under the current working condition are smaller than or equal to the first load threshold value, the actual load value under the current working condition is selected by the input of the load shaft of the VVT pulse spectrum table;
if the required load and the actual load under the current working condition are both larger than the second load threshold value, the load shaft of the VVT pulse spectrum table selects the required load value under the current working condition;
if the required load and the actual load under the current working condition are both larger than the first load threshold and smaller than or equal to the second load threshold, judging whether the absolute value of the difference value between the required load and the actual load under the current working condition is smaller than the difference threshold, if so, selecting the actual load value under the current working condition by the input of the load shaft of the VVT pulse spectrum table, otherwise, selecting the required load value under the current working condition by the input of the load shaft of the VVT pulse spectrum table;
and obtaining the current optimal VVT running value through interpolation calculation, outputting and controlling the engine.
2. The engine variable valve timing control method according to claim 1, characterized in that: the first load threshold is X% of the maximum practical load achievable at each rotational speed, the X value is defined as the medium load, and the first load threshold is variable according to the rotational speed.
3. The engine variable valve timing control method according to claim 2, characterized in that: the value of X percent is 50-70 percent.
4. The engine variable valve timing control method according to claim 1, characterized in that: the second load threshold is Y which can achieve the maximum actual load at each rotating speed, the Y value is defined as the large load, and the Y value is variable according to the rotating speed.
5. The engine variable valve timing control method according to claim 4, characterized in that: the value of the Y percent is 90-95 percent.
6. The engine variable valve timing control method according to any one of claims 1 to 5, characterized in that: the difference threshold is 3% -10% and is variable according to the rotating speed.
7. The engine variable valve timing control method according to claim 1, characterized in that: the current demand load is the in-cylinder demand charge calculated by the electronic control management system according to the driver pedal torque demand.
8. The engine variable valve timing control method according to claim 1, characterized in that: the current actual load is the actual inflation quantity in the current cylinder calculated by the electronic control management system according to the information of the existing load sensor.
9. An engine variable valve timing control system that implements the engine variable valve timing control method according to any one of claims 1 to 8, characterized in that:
the system comprises an information acquisition unit, a control unit and a control unit, wherein the information acquisition unit is configured to acquire the demand load and the actual load under the current working condition in real time;
the VVT pulse spectrum load shaft input value selection control unit is configured to select a proper load, wherein the proper load is a required load under the current working condition or an actual load under the current working condition;
and the VVT operation value calculation unit is configured to receive the proper load, take the proper load as the input of a load shaft of a VVT pulse spectrum, interpolate and calculate the current VVT operation value, and then output the current VVT operation value to control the engine.
10. The engine variable valve timing control system according to claim 9, characterized in that: the input value selection control unit of the VVT pulse spectrum load shaft comprises an information receiving module, a judging module and an information transmission module, wherein:
the information receiving module is configured to receive the demand load and the actual load under the current working condition transmitted by the information acquisition unit;
the judging module is configured to determine the proper load based on the required load under the current working condition, the actual load under the current working condition, the first load threshold value, the second load threshold value and the difference threshold value;
the information transfer module is configured to receive the appropriate load determined by the determination module and transfer the appropriate load to the VVT running value calculation unit.
11. The engine variable valve timing control system according to claim 10, characterized in that: the decision module determines that the appropriate load has the following three choices:
if the required load and the actual load under the current working condition are smaller than or equal to the first load threshold value, the input value of the load shaft of the VVT pulse spectrum table selects the actual load under the current working condition;
if the required load and the actual load under the current working condition are both larger than the second load threshold value, the input value of the load shaft of the VVT pulse spectrum table selects the required load under the current working condition;
if the required load and the actual load under the current working condition are both larger than the first load threshold and are both smaller than or equal to the second load threshold, judging whether the absolute value of the difference value between the required load and the actual load under the current working condition is smaller than the difference threshold, if so, selecting the actual load under the current working condition by the input value of the load shaft of the VVT pulse spectrum table, otherwise, selecting the required load under the current working condition by the input value of the load shaft of the VVT pulse spectrum table.
12. The engine variable valve timing control system according to claim 9, characterized in that: the first load threshold is X% of the maximum practical load achievable at each rotational speed, the X value is defined as the medium load, and the first load threshold is variable according to the rotational speed.
13. The engine variable valve timing control system according to claim 12, characterized in that: the value of X percent is 50-70 percent.
14. The engine variable valve timing control system according to claim 9, characterized in that: the second load threshold is Y which can achieve the maximum actual load at each rotating speed, the Y value is defined as the large load, and the Y value is variable according to the rotating speed.
15. The engine variable valve timing control system according to claim 14, characterized in that: the value of the Y percent is 90-95 percent.
16. The engine variable valve timing control system according to claim 9, characterized in that: the difference threshold is 3% -10% and is variable according to the rotating speed.
17. An engine, characterized in that: an engine variable valve timing control system including any one of claims 9 to 16.
18. An automobile, comprising a body, characterized in that: the vehicle body is provided with the engine according to claim 17.
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| CN106194513A (en) * | 2016-09-12 | 2016-12-07 | 奇瑞汽车股份有限公司 | The petrol engine that a kind of non-air throttle controls, its purposes and control method thereof |
| CN110872988A (en) * | 2018-09-04 | 2020-03-10 | 丰田自动车株式会社 | Control device for miller cycle engine and control method for miller cycle engine |
| CN113357023A (en) * | 2021-06-22 | 2021-09-07 | 重庆长安汽车股份有限公司 | Transient control method and device for variable valve timing system and Miller cycle engine |
| CN113357024A (en) * | 2021-06-29 | 2021-09-07 | 重庆长安汽车股份有限公司 | Control method and device for variable valve timing of engine and automobile |
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