CN113357024A - Control method and device for variable valve timing of engine and automobile - Google Patents
Control method and device for variable valve timing of engine and automobile Download PDFInfo
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- CN113357024A CN113357024A CN202110733124.0A CN202110733124A CN113357024A CN 113357024 A CN113357024 A CN 113357024A CN 202110733124 A CN202110733124 A CN 202110733124A CN 113357024 A CN113357024 A CN 113357024A
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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
- F02D13/0223—Variable control of the intake valves only
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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
- F02D2200/00—Input parameters for engine control
- F02D2200/02—Input parameters for engine control the parameters being related to the engine
- F02D2200/10—Parameters related to the engine output, e.g. engine torque or engine speed
- F02D2200/101—Engine speed
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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 provides a method and a device for controlling variable valve timing of an engine and an automobile, and aims to solve the problem that fuel economy and heavy-load dynamic performance under a transient working condition and a partial load cannot be considered due to single selection of VVT MAP load coordinates. The method for controlling the variable valve timing of the engine comprises the following steps: acquiring the rotating speed, the actual load and the target load of the engine; according to the rotating speed of the engine, inserting a value from a pre-calibrated load threshold curve to obtain a corresponding load threshold; selecting the actual load or the target load as a load coordinate in a VVT MAP based on the determined load threshold and the target load; the engine variable valve timing control is then performed based on the VVT MAP for the selected load coordinate.
Description
Technical Field
The invention relates to a method and a device for controlling variable valve timing of an engine and an automobile.
Background
Variable Valve Timing (VVT) is a technical means for controlling the opening and closing time of an intake valve and an exhaust valve according to different rotating speeds and loads of an engine to realize the control of the air exchange process of the engine so as to achieve the aim of improving the performance of the engine. The VVT MAP is usually determined under a steady state condition, which is exemplified by a specific operating point, that is, under the condition of ensuring that the engine speed and the load are not changed, different VVT combinations are scanned, and an ignition angle is ensured to be in an optimal state in the scanning process, that is, an optimal state is: if the specific working condition point is in a non-detonation region, adjusting the ignition angle to a value when the torque reaches the maximum value; if the specific operating point is in the detonation region, the ignition angle needs to be adjusted to the detonation boundary. Then, analyzing and processing the scanned data, and selecting a target VVT according to different purposes; generally, in the partial load region, the VVT is selected mainly for economy, that is, the VVT having the lowest fuel consumption rate is selected; the VVT is selected in the outer characteristic region mainly for dynamics, that is, the VVT having the largest torque is selected. There is always an optimum firing angle for the selected VVT.
As shown in fig. 1, in the present control logic, the abscissa of VVT MAP and the ignition angle MAP is engine speed, and the ordinate is load. The load coordinate of the ignition angle MAP is the actual load; the load coordinate of the VVT MAP is optional for the actual load or the target load, is determined by a certain calibration parameter, and once the value of the calibration parameter is determined, the load coordinate of the VVT MAP completes the determination corresponding to the value of the calibration parameter. However, whether the load coordinate of the VVT MAP selects the actual load or the target load, there is a certain disadvantage:
(1) if the load coordinate of the VVT MAP is the actual load, the situation of no go on the load may occur in some cases. This is because some large load conditions are caused by the load increase due to the change of VVT, and if the load coordinate of VVT is the actual load, VVT cannot be changed to the VVT required for the load increase to a large load, which causes the load to be unchanged, thereby affecting the dynamic performance of the engine.
(2) If the load coordinate of the VVT MAP is the target load, under the transient working condition, due to the intake delay, the actual load and the target load have deviation, so that the selected VVT is not adaptive to the ignition angle, and the fuel economy is negatively influenced.
Usually, the engine dynamics is an important index, and therefore, the load coordinate of the VVT MAP is often used to select the target load to sacrifice the fuel economy of the partial load under the transient condition to ensure that the engine load can be increased.
Disclosure of Invention
In view of the problems of the existing control strategy, the invention provides a method and a device for controlling variable valve timing of an engine and an automobile, and aims to solve the problem that fuel economy and large-load dynamic performance under transient working condition partial load caused by single selection of VVT MAP load coordinates cannot be considered.
The technical scheme of the invention is as follows:
the invention provides a method for controlling variable valve timing of an engine, which comprises the following steps:
acquiring the rotating speed, the actual load and the target load of the engine;
according to the rotating speed of the engine, inserting a value from a pre-calibrated load threshold curve to obtain a corresponding load threshold;
selecting the actual load or the target load as a load coordinate in a VVT MAP based on the determined load threshold and the target load;
the engine variable valve timing control is then performed based on the VVT MAP for the selected load coordinate.
Preferably, the step of selecting the actual load or the target load as a load coordinate in the VVT MAP based on the determined load threshold and the target load comprises:
comparing the sum of the load threshold and a hysteresis value determined by pre-calibration with the target load;
if the target load is greater than or equal to the sum of the load threshold and a hysteresis value determined by calibration in advance, selecting the target load as a load coordinate in a VVT MAP graph;
if the target load is smaller than the sum of the load threshold and a hysteresis value determined by pre-calibration, comparing the load threshold with the target load in size;
if the target load is smaller than the load threshold, selecting the actual load as a load coordinate in a VVT MAP graph;
and if the target load is greater than or equal to the load threshold, keeping the current load coordinate in the VVT MAP unchanged.
The present invention also provides a variable valve timing control apparatus for an engine, comprising:
the acquisition module is used for acquiring the rotating speed, the actual load and the target load of the engine;
the interpolation module is used for interpolating values from a pre-calibrated load threshold curve to obtain a corresponding load threshold according to the rotating speed of the engine;
a selection module for selecting the actual load or the target load as a load coordinate in a VVT MAP based on the determined load threshold and the target load;
a control module is configured to perform engine variable valve timing control based again on the VVT MAP for the selected load coordinate.
Preferably, the selection module comprises:
the first comparison unit is used for comparing the sum of the load threshold value and a hysteresis value determined by calibration in advance with the target load in size;
a first selecting unit, configured to select the target load as a load coordinate in a VVT MAP if the target load is greater than or equal to a sum of the load threshold and a hysteresis value determined by calibration in advance;
the second comparison unit is used for comparing the load threshold with the target load if the target load is smaller than the sum of the load threshold and a hysteresis value determined by calibration in advance;
a second selecting unit, configured to select the actual load as a load coordinate in a VVT MAP if the target load is smaller than the load threshold;
a holding unit configured to hold the current load coordinate in the VVT MAP unchanged if the target load is greater than or equal to the load threshold.
The embodiment of the invention also provides an automobile comprising the control device for the variable valve timing of the engine.
The invention has the beneficial effects that:
in the scheme, a load threshold curve and a hysteresis value which are related to the rotating speed are preset; inserting a value into a load threshold curve according to the acquired running parameters of the engine to obtain a corresponding load threshold; judging the magnitude of the sum of the target load and the load threshold plus the hysteresis value, and if the target load is greater than the sum of the load threshold plus the hysteresis value, selecting the target load by the VVT MAP load coordinate; if the target load is smaller than the sum of the load threshold and the hysteresis value, continuing to judge the size of the target load and the load threshold; if the target load is smaller than the load threshold, selecting an actual load according to the VVT MAP load coordinate; and if the target load is greater than the load threshold, maintaining the VVT MAP load coordinate as it is. By adopting the control method, the problem that fuel economy and large-load dynamic performance under the transient working condition partial load cannot be considered due to single selection of VVT MAP load coordinates can be effectively solved.
Drawings
In order that the detailed description of the present application may be clearly understood, a brief description of the drawings, which will be used when describing the detailed description of the present application, follows. It is obvious that this figure is only a partial embodiment of the present application, and that other figures can be obtained by a person skilled in the art without the inventive step.
FIG. 1 is a logic flow diagram of the method of the present invention;
FIG. 2 is a block diagram of the apparatus of the present invention.
Detailed Description
The following embodiments of the present application will be further described with reference to the accompanying drawings, and the implementation of the present application is not limited by the following embodiments, and the present application is within the protection scope of the present application as long as the method concept and technical solution of the present application are modified or directly applied to other occasions without modification.
The present invention will be described in further detail with reference to the accompanying drawings.
As shown in fig. 1, an embodiment of the present invention provides a method for controlling variable valve timing of an engine, the method having the following control strategies:
s101, firstly, obtaining the operation parameters of the engine, wherein the operation parameters mainly comprise the engine speed, the actual load, the target load and the like.
S102, according to the obtained engine operation parameters, inserting values into the load threshold value curve to obtain corresponding load threshold values, and obtaining hysteresis values.
The hysteresis value is set to avoid the problem of system instability caused by switching of VVT MAP load coordinate selection back and forth when the target load fluctuates slightly above and below the load threshold under the transient working condition. The hysteresis value is a specific value calibrated in advance.
In step S102, calibration of the load threshold curve and the hysteresis value is involved, and the specific calibration principle includes: (1) selecting medium and large loads as far as possible according to the load threshold; the reasons for these choices are: on one hand, in a common medium and small load region, the load coordinate of the VVT MAP can be selected as an actual load, and the VVT is ensured to be adaptive to an ignition angle, so that better fuel economy is ensured to be maintained in a load range as large as possible; on the other hand, a large load region can be ensured, and the load coordinate of the VVT MAP is selected as the target load, thereby ensuring the load in the large load region. (2) The VVT around the selected load threshold value changes as smoothly as possible; the reason is as follows: the method can avoid the situation that the load coordinate value of the VVT MAP is switched back and forth between the actual load and the target load due to the transient working condition, and the system is fluctuated when the target load and the actual load have certain deviation. (3) The hysteresis value should be moderate; the reason is as follows: when the hysteresis value is too large, the sum of the load threshold value and the hysteresis value may be too large, and the target load required to be output by the system in S203 cannot be reached, so that the load coordinate value of the VVT MAP cannot be changed into the target load in a heavy load region, and therefore, the problem that the load cannot be removed and the performance target cannot be reached may occur; when the hysteresis value is too small, and the target load required to be output by the system fluctuates in a small range above and below the load threshold value under the transient condition S203, the load coordinate value of the VVT MAP may be switched back and forth between the target load and the actual load, which may cause the fluctuation of the system.
In summary, in the pre-calibrated load threshold curve, the load threshold exceeding X% is a medium load or a large load, and the VVT change rate corresponding to each adjacent load threshold is within the preset change interval.
S103, judging the sum of the load threshold value and the hysteresis value obtained by the target load and the difference value, if the target load is greater than the sum of the load threshold value and the hysteresis value, executing S105, and selecting the target load by the VVT MAP load coordinate; if the target load is smaller than the sum of the load threshold and the hysteresis value, executing S104, and continuously judging the sizes of the target load and the load threshold; if the target load is smaller than the load threshold, executing S106, and selecting an actual load according to the VVT MAP load coordinate; if the target load is greater than the load threshold, S107 is executed, and the VVT MAP load coordinate is maintained unchanged.
Further, when the load coordinate corresponding to the VVT MAP is determined based on steps S105 to S107, the corresponding VVT may be determined based on the actual load or the target load, and the engine variable valve timing control may be realized.
The method can effectively solve the problem that fuel economy and large-load dynamic performance under the transient working condition partial load cannot be considered due to single selection of VVT MAP load coordinates.
Referring to fig. 2, the present invention also provides an engine variable valve timing control apparatus comprising:
the acquisition module is used for acquiring the rotating speed, the actual load and the target load of the engine;
the interpolation module is used for interpolating values from a pre-calibrated load threshold curve to obtain a corresponding load threshold according to the rotating speed of the engine;
a selection module for selecting the actual load or the target load as a load coordinate in a VVT MAP based on the determined load threshold and the target load;
a control module is configured to perform engine variable valve timing control based again on the VVT MAP for the selected load coordinate.
Preferably, the selection module comprises:
the first comparison unit is used for comparing the sum of the load threshold value and a hysteresis value determined by calibration in advance with the target load in size;
a first selecting unit, configured to select the target load as a load coordinate in a VVT MAP if the target load is greater than or equal to a sum of the load threshold and a hysteresis value determined by calibration in advance;
the second comparison unit is used for comparing the load threshold with the target load if the target load is smaller than the sum of the load threshold and a hysteresis value determined by calibration in advance;
a second selecting unit, configured to select the actual load as a load coordinate in a VVT MAP if the target load is smaller than the load threshold;
a holding unit configured to hold the current load coordinate in the VVT MAP unchanged if the target load is greater than or equal to the load threshold.
The invention also provides an automobile comprising the control device for the variable valve timing of the engine.
Claims (5)
1. A control method of variable valve timing of an engine, characterized by comprising:
acquiring the rotating speed, the actual load and the target load of the engine;
according to the rotating speed of the engine, inserting a value from a pre-calibrated load threshold curve to obtain a corresponding load threshold;
selecting the actual load or the target load as a load coordinate in a VVT MAP based on the determined load threshold and the target load;
the engine variable valve timing control is then performed based on the VVT MAP for the selected load coordinate.
2. The method of claim 1, wherein selecting the actual load or the target load as a load coordinate in a VVT MAP based on the determined load threshold and the target load comprises:
comparing the sum of the load threshold and a hysteresis value determined by pre-calibration with the target load;
if the target load is greater than or equal to the sum of the load threshold and a hysteresis value determined by calibration in advance, selecting the target load as a load coordinate in a VVT MAP graph;
if the target load is smaller than the sum of the load threshold and a hysteresis value determined by pre-calibration, comparing the load threshold with the target load in size;
if the target load is smaller than the load threshold, selecting the actual load as a load coordinate in a VVT MAP graph;
and if the target load is greater than or equal to the load threshold, keeping the current load coordinate in the VVT MAP unchanged.
3. An engine variable valve timing control apparatus, characterized by comprising:
the acquisition module is used for acquiring the rotating speed, the actual load and the target load of the engine;
the interpolation module is used for interpolating values from a pre-calibrated load threshold curve to obtain a corresponding load threshold according to the rotating speed of the engine;
a selection module for selecting the actual load or the target load as a load coordinate in a VVT MAP based on the determined load threshold and the target load;
a control module is configured to perform engine variable valve timing control based again on the VVT MAP for the selected load coordinate.
4. The apparatus of claim 3, wherein the selection module comprises:
the first comparison unit is used for comparing the sum of the load threshold value and a hysteresis value determined by calibration in advance with the target load in size;
a first selecting unit, configured to select the target load as a load coordinate in a VVT MAP if the target load is greater than or equal to a sum of the load threshold and a hysteresis value determined by calibration in advance;
the second comparison unit is used for comparing the load threshold with the target load if the target load is smaller than the sum of the load threshold and a hysteresis value determined by calibration in advance;
a second selecting unit, configured to select the actual load as a load coordinate in a VVT MAP if the target load is smaller than the load threshold;
a holding unit configured to hold the current load coordinate in the VVT MAP unchanged if the target load is greater than or equal to the load threshold.
5. An automobile characterized by comprising the engine variable valve timing control apparatus according to claim 3 or 4.
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| CN202110733124.0A CN113357024B (en) | 2021-06-29 | 2021-06-29 | Control method and device for variable valve timing of engine and automobile |
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| CN202110733124.0A CN113357024B (en) | 2021-06-29 | 2021-06-29 | Control method and device for variable valve timing of engine and automobile |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114776450A (en) * | 2022-03-09 | 2022-07-22 | 重庆长安汽车股份有限公司 | Variable valve timing control method and system for engine, engine and automobile |
| CN114810366A (en) * | 2022-03-28 | 2022-07-29 | 上海汽车集团股份有限公司 | Variable valve timing control method and system, vehicle control unit and vehicle |
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