CN115370492B - Control method and device of variable valve timing system and automobile - Google Patents
Control method and device of variable valve timing system and automobile Download PDFInfo
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- CN115370492B CN115370492B CN202211174740.8A CN202211174740A CN115370492B CN 115370492 B CN115370492 B CN 115370492B CN 202211174740 A CN202211174740 A CN 202211174740A CN 115370492 B CN115370492 B CN 115370492B
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- pressure value
- variable valve
- valve timing
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Classifications
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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
-
- 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 control method of a variable valve timing system, comprising the following steps: judging whether the engine is in an acceleration working condition or not; if the engine is in an acceleration working condition, acquiring an actual boost pressure value and a target boost pressure value in an airflow pipeline between the engine and the turbocharger; if the difference value between the target supercharging pressure value and the actual supercharging pressure value is larger than or equal to a first preset pressure value, controlling a variable valve timing system according to a pre-calibrated first VVT MAP, wherein the first preset pressure value is a positive value; if the engine is not in an acceleration working condition or the difference value between the target supercharging pressure value and the actual supercharging pressure value is smaller than a first preset pressure value, controlling a variable valve timing system according to a second VVT MAP (variable valve timing) MAP calibrated in advance; the first VVT MAP is a VVT MAP calibrated by taking dynamic property as a target; the second VVTMAP MAP is a VVT MAP calibrated for economy.
Description
Technical Field
The invention belongs to the field of automobile engine control, and particularly relates to a control method and device of a variable valve timing system and an automobile.
Background
VVT technology is currently widely used as a technology for improving fuel economy. However, there is a conflict between the dynamics and the fuel economy in the operation angle selection of the VVT. From the oil consumption perspective, the opening overlapping angle of the intake valve and the exhaust valve needs to be reduced, so that pumping loss is reduced; from the dynamic aspect, the air inlet and outlet opening overlapping angle needs to be increased, so that the air charging efficiency is improved.
In order to alleviate the contradiction, the current VVT control is mainly selected according to the optimal oil consumption through the VVT angle of the medium-low load working condition of the engine; in the working condition of the engine with large load, the VVT angle is inclined towards the dynamic property. The VVT control logic has the defect that in order to solve the problems of unstable engine combustion and driving irregularity caused by torque output fluctuation caused by the jump of the VVT in the transition process from medium-low load to medium-high load, the VVT transition is subjected to smooth treatment, so that the fuel consumption is not optimal in the transition zone, and the power is not optimal.
Disclosure of Invention
The invention aims to provide a control method and device of a variable valve timing system and an automobile, which can ensure optimal fuel economy when the power demand is low and power output under a tip-in acceleration working condition pursuing power response.
The technical scheme of the invention is as follows:
the invention provides a control method of a variable valve timing system, comprising the following steps:
judging whether the engine is in an acceleration working condition or not;
if the engine is in an acceleration working condition, acquiring an actual boost pressure value and a target boost pressure value in an airflow pipeline between the engine and the turbocharger;
if the difference value between the target supercharging pressure value and the actual supercharging pressure value is larger than or equal to a first preset pressure value, controlling a variable valve timing system according to a pre-calibrated first VVT MAP, wherein the first preset pressure value is a positive value;
if the engine is not in an acceleration working condition or the difference value between the target supercharging pressure value and the actual supercharging pressure value is smaller than a first preset pressure value, controlling a variable valve timing system according to a second VVT MAP (variable valve timing) MAP calibrated in advance;
the first VVT MAP is a VVT MAP calibrated by taking dynamic property as a target; the second VVTMAP MAP is a VVT MAP calibrated for economy.
Preferably, the judgment of whether the engine is in the acceleration condition is determined according to the accelerator pedal opening acquired at the front and rear acquisition time.
Preferably, if P is satisfied t2 -P t1 > 0 and (P t2 -P t1 ) If/(t 2-t 1) >. DELTA.P, determining that the engine is in an acceleration condition, wherein P t1 The opening degree of the accelerator pedal, P, acquired at the last acquisition time t1 of the front acquisition time and the rear acquisition time is t2 The accelerator pedal opening acquired at the next acquisition time t2 of the front acquisition time and the rear acquisition time is the pre-calibrated value of delta P.
Preferably, the method further comprises:
in the operation process of controlling the variable valve timing system according to a first VVT MAP diagram calibrated in advance, acquiring a new actual boost pressure value and a new target boost pressure value in an airflow pipeline between an engine and a turbocharger in real time;
if the difference value between the target supercharging pressure value and the actual supercharging pressure value is larger than or equal to a second preset pressure value, controlling the variable valve timing system to switch to operate according to a second VVT MAP MAP calibrated in advance, wherein the second preset pressure value is a negative value;
and if the difference value between the target supercharging pressure value and the actual supercharging pressure value is smaller than a second preset pressure value, controlling the variable valve timing system to operate according to a first VVT MAP MAP calibrated in advance.
The invention also provides a control device of the variable valve timing system, comprising:
the judging module is used for judging whether the engine is in an acceleration working condition or not;
the first acquisition module is used for acquiring an actual boost pressure value and a target boost pressure value in an airflow pipeline between the engine and the turbocharger if the engine is in an acceleration working condition;
the first control module is used for controlling the variable valve timing system according to a pre-calibrated first VVT MAP if the difference value between the target supercharging pressure value and the actual supercharging pressure value is larger than or equal to a first preset pressure value, and the first preset pressure value is a positive value;
the second control module is used for controlling the variable valve timing system according to a pre-calibrated second VVT MAP if the engine is not in an acceleration working condition or the difference value between the target supercharging pressure value and the actual supercharging pressure value is smaller than a first preset pressure value;
the first VVT MAP is a VVT MAP calibrated by taking dynamic property as a target; the second VVTMAP MAP is a VVT MAP calibrated for economy.
Preferably, the judging module determines whether the engine is in an acceleration condition according to the opening degree of the accelerator pedal acquired at the front and rear acquisition time.
Preferably, if P is satisfied t2 -P t1 > 0 and (P t2 -P t1 ) If the engine is in the acceleration condition, the judgment module determines that the engine is in the acceleration condition, wherein P is the ratio of (t 2-t 1) > [ delta ] P t1 The opening degree of the accelerator pedal, P, acquired at the last acquisition time t1 of the front acquisition time and the rear acquisition time is t2 The accelerator pedal opening acquired at the next acquisition time t2 of the front acquisition time and the rear acquisition time is the pre-calibrated value of delta P.
Preferably, the apparatus further comprises:
the second acquisition module is used for acquiring a new actual boost pressure value and a new target boost pressure value in an airflow pipeline between an engine and a turbocharger in real time in the process of controlling the variable valve timing system to operate according to a first VVT MAP (variable valve timing) MAP calibrated in advance;
the third control module is used for controlling the variable valve timing system to switch to operate according to a second VVT MAP (variable valve timing) MAP calibrated in advance if the difference value between the target supercharging pressure value and the actual supercharging pressure value is larger than or equal to a second preset pressure value, and the second preset pressure value is a negative value;
and the fourth control module is used for controlling the variable valve timing system to operate according to a pre-calibrated first VVT MAP if the difference value between the target supercharging pressure value and the actual supercharging pressure value is smaller than a second preset pressure value.
The invention also provides an automobile, which comprises the control device of the variable valve timing system.
The beneficial effects of the invention are as follows:
in order to better balance dynamic performance and economy, a control logic for a variable valve timing system based on user driving demand differentiation is established. The control logic can make the balance of the oil consumption and the power of the supercharged gasoline engine extremely, the core control logic not only distinguishes the VVT control based on the engine load or the VVT control based on the steady state and the transient working condition of the user, but also accurately identifies the acceleration demand degree of the user by introducing the change rate of the accelerator pedal, and judges whether the power VVT is activated or not by the difference between the target supercharging pressure and the actual supercharging pressure of the engine. When the user needs large accelerator acceleration, selecting a control mode of the variable valve timing system through a difference value between an actual boost pressure value and a target boost pressure value, and when the actual boost pressure value is smaller than the target boost pressure value, the variable valve timing system operates to a first VVT MAP, so that the dynamic property is improved to the maximum extent; when the actual boost pressure value approaches the target boost pressure value, the VVT is operated to the second VVT MAP. Thus, when the user needs to have uniform speed or low acceleration degree, the VVT with priority of economy is controlled to be executed so as to obtain optimal oil consumption; when the acceleration requirement of the user is higher, the control directly activates the VVT with the power priority, so that the problem that the performance is not optimal due to the excessive smooth requirement of the VVT in the current control strategy can be solved, and the control of the VVT can be closely related to the driving intention of the user.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below. It will be apparent to those skilled in the art that the drawings in the following description are some practical forms of the invention, and that other drawings may be obtained from these drawings without the inventive effort.
FIG. 1 is a flow chart of a control method of a variable valve timing system for improving tip-in acceleration dynamics of a turbocharged gasoline engine;
fig. 2 is a block diagram of the control device of the variable valve timing system in the present embodiment.
Detailed Description
The present invention will be described in detail with reference to the accompanying drawings.
As shown in fig. 1, the embodiment of the invention provides a control method of a variable valve timing system for improving the tip-in acceleration dynamics of a turbocharged gasoline engine, which comprises the following specific steps:
first step, determining dynamic VVT MAP and economical VVT MAP
When the engine is developed, firstly, VVT scanning is carried out based on optimal power performance and optimal fuel consumption respectively, a first VVT MAP graph with optimal power performance and a second VVT MAP graph with optimal fuel consumption are obtained, and the generated first VVT MAP graph with optimal power performance and the generated second VVT MAP graph with optimal fuel consumption are written into an engine control unit.
Step two, the engine control unit judges the working condition
The engine control unit acquires an accelerator opening signal (P), and judges whether the current working condition state is an acceleration working condition according to whether the accelerator pedal opening (P) is increased or not and the rate of the pedal opening increase. Specifically, the recognition of the acceleration conditions and their extent is performed by the engine control unit: through P t2 -P t1 Judging whether the current working condition is an acceleration working condition or not by (P t2 -P t1 ) And/(t 2-t 1) to determine the degree of acceleration. If the current working condition P t2 -P t1 > 0, and (P t2 -P t1 ) If the ratio of (t 2-t 1) is greater than the calibration value (delta P), the second step is executed under the acceleration condition; otherwise, the current working condition is other working conditions.
Step three, the engine control unit carries out VVT MAP judgment and selection of the variable timing valve system
After identifying the acceleration condition, the engine control unit first generates a signal (P based on the obtained actual boost pressure signal (P A ) Target boost pressure signal (P T ) Whether the acceleration operation is to activate the dynamic VVT control mode is performed. If P T -P A The first preset pressure value is not less than the first preset pressure value (30 kPa is recommended), and the variable valve timing system under the acceleration working condition is judged to be required to run to a first VVT MAP; such as P T -P A And < a first preset pressure value, controlling the variable valve timing system to operate to a second VVT MAP.
Step four, the engine control unit performs a first VVT MAP exit judgment
In the engine in the dynamic VVT operation mode, a target boost pressure (P T ) And the actual boost pressure (P A ) If PA-PT < a second preset pressure value (recommended to be-5 kPa), the engine control unit controls the variable timing valve system to maintain the first VVT MAP; if P A -P T And (2) not less than a second preset pressure value (the second preset pressure value is recommended to be-5 kPa), the engine control unit controls the variable timing valve system to exit the first VVT MAP MAP and switch to the second VVT MAP MAP.
The method of the invention better balances dynamic property and economy, and establishes a control logic for carrying out variable valve timing system based on user driving demand differentiation. For the turbo-charged gasoline engine, when a user needs large accelerator acceleration, selecting a control mode of the variable valve timing system through a difference value between an actual boost pressure value and a target boost pressure value, and when the actual boost pressure value is smaller than the target boost pressure value, the variable valve timing system operates to a first VVT MAP, so that the dynamic property is improved to the greatest extent; when the actual boost pressure value approaches the target boost pressure value, the VVT is operated to the second VVT MAP.
Referring to fig. 2, the present invention also provides a control device of a variable valve timing system, including:
the judging module is used for judging whether the engine is in an acceleration working condition or not;
the first acquisition module is used for acquiring an actual boost pressure value and a target boost pressure value in an airflow pipeline between the engine and the turbocharger if the engine is in an acceleration working condition;
the first control module is used for controlling the variable valve timing system according to a pre-calibrated first VVT MAP if the difference value between the target supercharging pressure value and the actual supercharging pressure value is larger than or equal to a first preset pressure value, and the first preset pressure value is a positive value;
the second control module is used for controlling the variable valve timing system according to a pre-calibrated second VVT MAP if the engine is not in an acceleration working condition or the difference value between the target supercharging pressure value and the actual supercharging pressure value is smaller than a first preset pressure value;
the first VVT MAP is a VVT MAP calibrated by taking dynamic property as a target; the second VVTMAP MAP is a VVT MAP calibrated for economy.
Preferably, the judging module determines whether the engine is in an acceleration condition according to the opening degree of the accelerator pedal acquired at the front and rear acquisition time.
Preferably, if P is satisfied t2 -P t1 > 0 and (P t2 -P t1 ) If the engine is in the acceleration condition, the judgment module determines that the engine is in the acceleration condition, wherein P is the ratio of (t 2-t 1) > [ delta ] P t1 The opening degree of the accelerator pedal, P, acquired at the last acquisition time t1 of the front acquisition time and the rear acquisition time is t2 For the next acquisition in the front and back acquisition momentsThe opening degree of the accelerator pedal acquired at the time t2 is a value calibrated in advance.
Preferably, the apparatus further comprises:
the second acquisition module is used for acquiring a new actual boost pressure value and a new target boost pressure value in an airflow pipeline between an engine and a turbocharger in real time in the process of controlling the variable valve timing system to operate according to a first VVT MAP (variable valve timing) MAP calibrated in advance;
the third control module is used for controlling the variable valve timing system to switch to operate according to a second VVT MAP (variable valve timing) MAP calibrated in advance if the difference value between the target supercharging pressure value and the actual supercharging pressure value is larger than or equal to a second preset pressure value, and the second preset pressure value is a negative value;
and the fourth control module is used for controlling the variable valve timing system to operate according to a pre-calibrated first VVT MAP if the difference value between the target supercharging pressure value and the actual supercharging pressure value is smaller than a second preset pressure value.
The device of the invention is a device corresponding to the method one by one and has the same technical effects as the method. That is, the balance of dynamic property and economy is better performed, and a control logic for performing the variable valve timing system based on the difference in the driving demand of the user is established. For the turbo-charged gasoline engine, when a user needs large accelerator acceleration, selecting a control mode of the variable valve timing system through a difference value between an actual boost pressure value and a target boost pressure value, and when the actual boost pressure value is smaller than the target boost pressure value, the variable valve timing system operates to a first VVT MAP, so that the dynamic property is improved to the greatest extent; when the actual boost pressure value approaches the target boost pressure value, the VVT is operated to the second VVT MAP.
The invention also provides an automobile, which comprises the control device of the variable valve timing system.
Claims (5)
1. A control method of a variable valve timing system, characterized by comprising:
judging whether the engine is in an acceleration working condition according to the opening degree of the accelerator pedal acquired at the front and rear acquisition moments;
if the engine is in an acceleration working condition, acquiring an actual boost pressure value and a target boost pressure value in an airflow pipeline between the engine and the turbocharger;
if the difference value between the target supercharging pressure value and the actual supercharging pressure value is larger than or equal to a first preset pressure value, controlling a variable valve timing system according to a pre-calibrated first VVT MAP, wherein the first preset pressure value is a positive value;
if the engine is not in an acceleration working condition or the difference value between the target supercharging pressure value and the actual supercharging pressure value is smaller than a first preset pressure value, controlling a variable valve timing system according to a second VVT MAP (variable valve timing) MAP calibrated in advance;
in the operation process of controlling the variable valve timing system according to a first VVT MAP (variable valve timing) MAP calibrated in advance, acquiring a new actual boost pressure value and a new target boost pressure value in an airflow pipeline between an engine and a turbocharger in real time;
if the difference value between the target supercharging pressure value and the actual supercharging pressure value is larger than or equal to a second preset pressure value, controlling the variable valve timing system to switch to operate according to a second VVT MAP MAP calibrated in advance, wherein the second preset pressure value is a negative value;
if the difference value between the target supercharging pressure value and the actual supercharging pressure value is smaller than a second preset pressure value, controlling a variable valve timing system to operate according to a first VVT MAP (variable valve timing) MAP calibrated in advance;
the first VVT MAP is a VVT MAP calibrated by taking dynamic property as a target; the second VVTMAP MAP is a VVT MAP calibrated for economy.
2. The control method of a variable valve timing system according to claim 1, characterized in that if P is satisfied t2 -P t1 > 0 and (P t2 -P t1 ) If/(t 2-t 1) >. DELTA.P, determining that the engine is in an acceleration condition, wherein P t1 The opening degree of the accelerator pedal, P, acquired at the last acquisition time t1 of the front acquisition time and the rear acquisition time is t2 The accelerator pedal opening acquired at the next acquisition time t2 of the front acquisition time and the rear acquisition time is the pre-calibrated value of delta P.
3. A control device of a variable valve timing system, characterized by comprising:
the judging module is used for judging whether the engine is in an acceleration working condition according to the opening degree of the accelerator pedal acquired at the front and rear acquisition time;
the first acquisition module is used for acquiring an actual boost pressure value and a target boost pressure value in an airflow pipeline between the engine and the turbocharger if the engine is in an acceleration working condition;
the first control module is used for controlling the variable valve timing system according to a pre-calibrated first VVT MAP if the difference value between the target supercharging pressure value and the actual supercharging pressure value is larger than or equal to a first preset pressure value, and the first preset pressure value is a positive value;
the second control module is used for controlling the variable valve timing system according to a pre-calibrated second VVT MAP if the engine is not in an acceleration working condition or the difference value between the target supercharging pressure value and the actual supercharging pressure value is smaller than a first preset pressure value;
the second acquisition module is used for acquiring a new actual boost pressure value and a new target boost pressure value in an airflow pipeline between the engine and the turbocharger in real time in the process of controlling the variable valve timing system to operate according to a first VVT MAP (variable valve timing) MAP calibrated in advance;
the third control module is used for controlling the variable valve timing system to switch to operate according to a second VVT MAP (variable valve timing) MAP calibrated in advance if the difference value between the target supercharging pressure value and the actual supercharging pressure value is larger than or equal to a second preset pressure value, and the second preset pressure value is a negative value;
the fourth control module is used for controlling the variable valve timing system to operate according to a first VVT MAP (MAP) calibrated in advance if the difference value between the target supercharging pressure value and the actual supercharging pressure value is smaller than a second preset pressure value;
the first VVT MAP is a VVT MAP calibrated by taking dynamic property as a target; the second VVTMAP MAP is a VVT MAP calibrated for economy.
4. The control device of a variable valve timing system according to claim 3, characterized in that if P is satisfied t2 -P t1 > 0 and (P t2 -P t1 ) If the engine is in the acceleration condition, the judgment module determines that the engine is in the acceleration condition, wherein P is the ratio of (t 2-t 1) > [ delta ] P t1 The opening degree of the accelerator pedal, P, acquired at the last acquisition time t1 of the front acquisition time and the rear acquisition time is t2 The accelerator pedal opening acquired at the next acquisition time t2 of the front acquisition time and the rear acquisition time is the pre-calibrated value of delta P.
5. An automobile comprising the control device of the variable valve timing system according to any one of claims 3 to 4.
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| CN202211174740.8A CN115370492B (en) | 2022-09-26 | 2022-09-26 | Control method and device of variable valve timing system and automobile |
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| CN202211174740.8A CN115370492B (en) | 2022-09-26 | 2022-09-26 | Control method and device of variable valve timing system and automobile |
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| CN115370492A CN115370492A (en) | 2022-11-22 |
| CN115370492B true CN115370492B (en) | 2023-08-22 |
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2022
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| JPH11141375A (en) * | 1997-11-10 | 1999-05-25 | Nissan Motor Co Ltd | Boost control device for internal combustion engine with supercharger |
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