CN113357029B - Engine torque control method and readable storage medium for two-step valve lift variation - Google Patents
Engine torque control method and readable storage medium for two-step valve lift variation Download PDFInfo
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- CN113357029B CN113357029B CN202110702324.XA CN202110702324A CN113357029B CN 113357029 B CN113357029 B CN 113357029B CN 202110702324 A CN202110702324 A CN 202110702324A CN 113357029 B CN113357029 B CN 113357029B
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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
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/0002—Controlling intake air
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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
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/0002—Controlling intake air
- F02D41/0007—Controlling intake air for control of turbo-charged or super-charged engines
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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
- F02D9/00—Controlling engines by throttling air or fuel-and-air induction conduits or exhaust conduits
- F02D9/02—Controlling engines by throttling air or fuel-and-air induction conduits or exhaust conduits concerning induction conduits
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02P—IGNITION, OTHER THAN COMPRESSION IGNITION, FOR INTERNAL-COMBUSTION ENGINES; TESTING OF IGNITION TIMING IN COMPRESSION-IGNITION ENGINES
- F02P5/00—Advancing or retarding ignition; Control therefor
- F02P5/04—Advancing or retarding ignition; Control therefor automatically, as a function of the working conditions of the engine or vehicle or of the atmospheric conditions
- F02P5/045—Advancing or retarding ignition; Control therefor automatically, as a function of the working conditions of the engine or vehicle or of the atmospheric conditions combined with electronic control of other engine functions, e.g. fuel injection
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02P—IGNITION, OTHER THAN COMPRESSION IGNITION, FOR INTERNAL-COMBUSTION ENGINES; TESTING OF IGNITION TIMING IN COMPRESSION-IGNITION ENGINES
- F02P5/00—Advancing or retarding ignition; Control therefor
- F02P5/04—Advancing or retarding ignition; Control therefor automatically, as a function of the working conditions of the engine or vehicle or of the atmospheric conditions
- F02P5/145—Advancing or retarding ignition; Control therefor automatically, as a function of the working conditions of the engine or vehicle or of the atmospheric conditions using electrical means
- F02P5/15—Digital data processing
- F02P5/1502—Digital data processing using one central computing unit
- F02P5/1504—Digital data processing using one central computing unit with particular means during a transient phase, e.g. acceleration, deceleration, gear change
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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
- F02D2200/60—Input parameters for engine control said parameters being related to the driver demands or status
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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
- F02D2250/00—Engine control related to specific problems or objectives
- F02D2250/18—Control of the engine output torque
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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
- F02D2250/00—Engine control related to specific problems or objectives
- F02D2250/18—Control of the engine output torque
- F02D2250/22—Control of the engine output torque by keeping a torque reserve, i.e. with temporarily reduced drive train or engine efficiency
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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
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- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Theoretical Computer Science (AREA)
- Signal Processing (AREA)
- Valve Device For Special Equipments (AREA)
- Output Control And Ontrol Of Special Type Engine (AREA)
Abstract
The invention discloses an engine torque control method for two-stage valve lift change, wherein in the process of switching a high lift by a low lift, the gas path torque quickly follows the torque required by a driver, and the gas path torque gradually follows the gas path torque by a set step length, so that the engine torque is smoothly output; in the process of switching the high lift to the low lift, gas circuit torque storage is carried out, the fire circuit torque is kept to follow the driver required torque synchronously, and when the gas circuit torque meets the driver required torque, the fire circuit torque is enabled to quickly follow the gas circuit torque, so that the torque output of the engine is smooth. The invention also discloses a readable storage medium. The invention can improve the step problem of the output torque of the engine when the two-stage variable lift is changed, improve the driving feeling of a driver, fully ensure the engine dynamic property and the fuel economy of the two-stage intake lift, and limit and protect the dynamic load of the engine power assembly.
Description
Technical Field
The invention relates to an engine control technology, in particular to an engine torque control method and a readable storage medium for two-stage valve lift change.
Background
The valve lift of the traditional engine is fixed and unchanged, and the performance of the engine at high and low rotating speeds cannot be considered. Variable Valve Lift (VVL) technology can change a valve lift according to different working conditions, thereby improving the dynamic property and the economical efficiency of an engine. When the engine is operated at a low load (intake air amount), the valve low lift is adopted, so that pumping loss can be reduced, and fuel economy is improved. When the engine runs under a large load, the lift is switched to a high lift, so that large power and torque can be output, and the dynamic property is improved.
At present, variable valve lift technology is rapidly developed on automobile engines, and is mainly classified into a continuous type and a two-stage type. Compared with the continuous variable valve lift technology, the two-stage valve lift technology has low cost and low implementation difficulty. However, when the two-step valve lift is changed, the amount of intake air into the engine cylinder exhibits a stepwise change, as shown in fig. 1. When the two-step valve lift is changed, the output torque of the engine is stepped, and the driving feeling is affected, as shown in fig. 2.
In the function of torque conversion, the torque required by a driver is divided into gas path torque and fire path torque after coordination, the gas path torque is mainly realized by changing the air inflow in an air cylinder, the gas path torque is used for calculating expected air inflow, the opening of a throttle valve is calculated according to the expected air inflow, and the actual oil injection quantity of each cylinder is controlled and calculated according to the air-fuel ratio, so that the control of a gas path is realized; the firing path torque is achieved by torque intervention firing angle. In view of drivability filtering, the gas path torque is limited by the gas path torque, and the gas path torque gradually follow the driver demand torque.
FIG. 3a is a prior art schematic of driver demand torque, gas path torque, and fire path torque during low-lift to high-lift switching; FIG. 3b is a graphical illustration of driver torque demand, air path torque, and fire path torque during high lift to low lift switching of the prior art. During the process of switching the high lift from the low lift, the intake air amount suddenly increases due to the change of the lift (as shown in fig. 1), the maximum output torque of the engine also suddenly increases, and if the flame path torque directly follows the flame path torque, the flame path torque also suddenly increases (as shown in fig. 3 a), and the output torque of the engine suddenly increases (as shown in fig. 2). Similarly, during the process of switching the high lift to the low lift, the intake air amount is suddenly reduced due to the change of the lift, and the maximum output torque of the engine is also suddenly reduced at the same time, if the fire path torque still directly follows the air path torque, the fire path torque is also suddenly reduced (as shown in fig. 3 b), and the output torque of the engine is suddenly reduced. In both cases, the driving experience will be affected.
Disclosure of Invention
The invention aims to provide an engine torque control method and a readable storage medium for two-stage valve lift change, which can solve the problem that the engine torque is stepped when the two-stage valve lift changes in the prior art.
In order to solve the technical problem, the invention provides an engine torque control method for two-step valve lift change, wherein the engine torque control method comprises the following steps:
in the process of switching the high lift range from the low lift range, the gas path torque quickly follows the torque required by a driver, and the gas path torque gradually follows the gas path torque by a set step length, so that the torque output of the engine is smooth;
in the process of switching the high lift to the low lift, gas circuit torque storage is carried out, the fire circuit torque is kept to follow the driver required torque synchronously, and when the gas circuit torque meets the driver required torque, the fire circuit torque is enabled to quickly follow the gas circuit torque, so that the torque output of the engine is smooth.
Further, when a switching request of switching a high lift range by a low lift range is responded, the gas path torque quickly follows the torque required by the driver, the gas path torque gradually follows the gas path torque by a set step length, and the ignition angle is quickly postponed and then is advanced according to the gas path torque requirement of following the gas path torque by the set step length.
Further, when a switching request of switching a high lift range and a low lift range is identified, gas path torque storage is carried out, the flame path torque is kept to follow the torque required by the driver, and the ignition angle is delayed;
when the gas circuit torque reserve meets the torque required by the driver, the gas circuit torque quickly follows the torque required by the driver in response to the switching request of switching the high lift and the low lift, so that the gas circuit torque quickly follows the gas circuit torque, and the ignition angle is quickly advanced.
Further, the engine torque control method includes the steps of:
step S1, judging whether a high-low lift switching request exists according to the change of the torque required by the driver in the current driving cycle, if so, entering step S2, otherwise, the flame path torque continuously follows the gas path torque, the ignition angle responds to the torque required by the flame path, and the engine torque is output;
step S2, judging whether the request is a switching request of low lift switching and high lift, if yes, responding to the switching request, and entering step S3, otherwise, entering step S4;
step S3, when the first cylinder with low lift and high lift switched finishes the air intake with high lift, calculating the step amount of the gas path torque of the first cylinder with high lift air intake, enabling the gas path torque to follow the gas path torque with a set step length according to the step amount of the gas path torque, quickly delaying the ignition angle, then advancing according to the gas path torque requirement with the set step length, and outputting the engine torque;
step S4, storing gas circuit torque, and delaying an ignition angle when the gas circuit torque follows the torque required by the driver;
step S5, when the gas circuit torque reserve meets the condition of high lift switching low lift, responding the switching request of high lift switching low lift;
and step S6, when the first cylinder with high lift and low lift switched finishes the air intake with low lift, the flame path torque follows the air path torque, the ignition angle is rapidly advanced, and the engine torque is output.
Further, in the process of switching the high lift range from the low lift range, on the premise of meeting driving smoothness, the torque of the fire path follows the torque of the gas path in a fixed step length.
Further, the fixed step size is 10N m-15N m.
Further, in the process of switching the high lift to the low lift, the gas path torque meeting the driver required torque means that the gas path torque corresponding to the target low lift is equal to or higher than the driver required torque.
Further, in step S4, the gas path torque reserve is performed by increasing the throttle or boost.
Further, in step S1, it is determined that there is a high-low lift switch request when the amount of change in the driver required torque exceeds a preset threshold.
Meanwhile, the present invention also provides a readable storage medium having stored thereon a computer program which, when executed with a processor, is capable of implementing the aforementioned engine torque control method.
Compared with the prior art, in the engine torque control method for the two-stage valve lift change, when the high lift is switched through the low lift, the gas path torque is slowly followed by the fire path torque in a set step length, so that the step condition of the output torque of the engine is improved, when the low lift is switched through the high lift, the gas path torque is firstly reserved, and when the gas path torque reserve meets the switching requirement, the switching action is executed, so that the fire path torque follows the gas path torque, and the smoothness of the output torque of the engine is kept. Therefore, the invention can improve the step problem of the output torque of the engine when the two-stage variable lift is changed, improve the driving feeling of a driver, fully ensure the engine dynamic property and the fuel economy of the two-stage intake lift, and limit and protect the dynamic load of the engine power assembly.
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 is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a comparison of two-step valve lift and continuous valve lift at engine intake air amount in accordance with the present invention;
FIG. 2 is a graph comparing two-step valve lift with continuous valve lift in terms of engine torque;
FIG. 3a is a schematic illustration of driver demand torque, gas path torque and flame path torque during low lift to high lift switching in the prior art;
FIG. 3b is a schematic illustration of driver demand torque, gas path torque, and flame path torque during high lift to low lift switching of the prior art;
FIG. 4 is a schematic diagram of coordination of gas paths and fire paths during a change of a two-stage valve lift according to the present invention;
FIG. 5a is a schematic illustration of driver demand torque, air path torque and fire path torque during low lift to high lift switching in accordance with the present invention;
FIG. 5b is a schematic illustration of driver demand torque, air path torque and fire path torque during high lift to low lift switching in accordance with the present invention;
FIG. 6 is a flow chart of an engine torque control method of the present invention.
Detailed Description
The embodiments of the present invention are described below with reference to specific embodiments, and other advantages and technical effects of the present invention will be fully apparent to those skilled in the art from the disclosure in the specification. It should be apparent that the described embodiments are only some of the embodiments of the present invention, and not all of them. The invention is capable of other embodiments and of being practiced or of being carried out in various ways, and its several details are capable of modification in various respects, all without departing from the general spirit of the invention. It should be noted that, in the following embodiments, technical features may be combined with each other without conflict.
Furthermore, it will be understood that each block of the block diagrams and/or flowchart illustrations, and combinations of blocks in the block diagrams and/or flowchart illustrations, can be implemented by special purpose hardware-based systems that perform the specified functions or acts, or combinations of special purpose hardware and computer program instructions. It is well known to those skilled in the art that implementation by hardware, by software, and by a combination of software and hardware are equivalent.
Example one
In order to solve the problem that the torque output of an engine has a step when the two-stage variable lift is changed and the driving feeling is influenced in the prior art, the invention provides a control method capable of enabling the torque output of the engine to be smooth, wherein the control method comprises the following steps:
in the process of switching the high lift range from the low lift range, the gas path torque quickly follows the torque required by a driver, and the gas path torque gradually follows the gas path torque by a set step length, so that the torque output of the engine is smooth;
in the process of switching the high lift to the low lift, gas circuit torque storage is carried out, the fire circuit torque is kept to follow the driver required torque synchronously, and when the gas circuit torque meets the driver required torque, the fire circuit torque is enabled to quickly follow the gas circuit torque, so that the torque output of the engine is smooth.
It should be noted that the phrase "the gas path torque rapidly follows the driver requested torque" means that the gas path torque rapidly responds to the driver requested torque without affecting engine emissions and driving smoothness. Similarly, the phrase "the gas path torque is followed quickly by the gas path torque" means that the gas path torque is responded quickly by the gas path torque without affecting engine emissions and ride comfort.
In the process of switching the high lift range from the low lift range, the fact that the fire path torque gradually follows the gas path torque in a set step length means that the fire path torque follows the gas path torque in a fixed step length on the premise of meeting driving smoothness. Preferably, the fixed step size is 10N m-15N m.
In the process of switching the high lift to the low lift, the gas circuit torque meeting the driver required torque means that the gas circuit torque corresponding to the target low lift is equal to or higher than the driver required torque.
The principle of the engine torque control method is mainly to judge whether the current gas circuit torque meets the driver driving torque demand or not based on different air intake amount demands during high-low lift change. If the conditions are met, performing lift switching; if not, the lift switch is retarded until the conditions are met, as shown in FIG. 4.
As shown in fig. 4, when a switching request of switching low lift to high lift occurs, low-lift coordination (including flame path torque intervention, ignition angle delay, throttle adjustment, intake and exhaust VVT angle adjustment, etc.) is performed, then a switching request of low-lift (low-lift switching high lift) is responded, low-lift action is performed, air intake under high lift is completed, load (air intake amount) is suddenly increased, at this time, the ignition angle is quickly delayed, and in order to ensure smooth output torque of an engine, the flame path torque needs to gradually follow the flame path torque by a set step length, and the ignition angle needs to be delayed to respond to the requirement of flame path torque.
Likewise, as shown in fig. 4, when a switching request for switching the high lift to the low lift occurs, prediction is made based on the intake air amount at the low lift at this time, and it is determined that the gas path torque does not satisfy the driver required torque at this time, so the response to the switching request for switching the high lift to the low lift is delayed. During this process, path torque is reserved (increased path torque), the path torque is synchronously maintained to follow the driver demand torque, and the firing angle is retarded (pulled down) in response to the demand for path torque. When the gas path torque reserve meets the switching requirement of high-cut-low, high-cut-low coordination (comprising gas path torque intervention, ignition angle delay, air inlet pressure increase, throttle valve adjustment, air inlet and outlet VVT angle adjustment and the like) is carried out, then the switching request of high-cut-low (high lift switching and low lift) is responded, the high-cut-low action is executed, the load (air inlet amount) is suddenly reduced, the ignition angle is rapidly advanced at the moment, and the gas path torque is rapidly followed by the gas path torque.
FIG. 5a is a schematic illustration of driver torque demand, gas path torque and flame path torque during low lift switching high lift in accordance with the present invention; FIG. 5b is a schematic illustration of driver torque demand, gas path torque, and fire path torque during high lift to low lift in accordance with the present invention.
As shown in fig. 5a, in the process of switching the low lift to the high lift, the change of the lift causes the air intake amount to suddenly increase, the air path torque quickly follows the torque required by the driver (i.e., the air path torque suddenly increases), and in order to improve the step of the output torque of the engine, the invention controls the fire path torque to slowly increase by a set step length, gradually follows the air path torque, and controls the delay degree of the ignition angle to make the ignition angle respond to the requirement of the fire path torque, so that the finally output torque of the engine keeps smooth.
As shown in fig. 5b, when a switching request of switching high lift and low lift is identified, gas circuit torque reserve (increasing gas circuit torque) is carried out, the gas circuit torque is synchronously kept to follow the driver required torque, and the ignition angle is delayed to enable the gas circuit torque to respond to the requirement of the gas circuit torque; when the gas path torque reserve meets the condition of switching the low lift range by the high lift range (namely the gas path torque corresponding to the target low lift range is equal to or higher than the torque required by the driver), responding to the switching request of switching the low lift range by the high lift range, leading the air intake quantity to be suddenly reduced due to the change of the lift range, quickly following the torque required by the driver by the gas path torque, synchronously quickly following the gas path torque by the gas path torque, and quickly advancing the ignition angle.
In the engine torque control method for two-stage valve lift change, when the high lift is switched in the low lift, the gas circuit torque is slowly followed by the set step length through the fire circuit torque, so that the step condition of the engine output torque is improved, and when the low lift is switched in the high lift, the gas circuit torque is firstly stored, when the gas circuit torque storage meets the switching requirement, the switching action is executed again, so that the fire circuit torque follows the gas circuit torque, and the smoothness of the engine output torque is kept.
Example two
On the basis of the first embodiment, the present embodiment further describes specific implementation steps of the engine torque control method. Specifically, the engine torque control method of the present embodiment, as shown in fig. 6, includes the steps of:
step S1, judging whether a high-low lift switching request exists according to the change of the torque required by the driver in the current driving cycle, if so, entering step S2, otherwise, the flame path torque continuously follows the gas path torque, the ignition angle responds to the requirement of the flame path torque, and the engine torque is output;
step S2, judging whether the request is a switching request of low lift switching and high lift, if yes, responding to the switching request, and entering step S3, otherwise, entering step S4;
step S3, when the first cylinder with low lift and high lift switched finishes the air intake with high lift, calculating the step amount of the gas circuit torque of the first cylinder with high lift air intake, enabling the gas circuit torque to follow the gas circuit torque with a set step length according to the step amount of the gas circuit torque (on the premise of meeting driving smoothness, the gas circuit torque follows the gas circuit torque with a fixed step length), correspondingly, the ignition angle is quickly delayed and then advanced according to the gas circuit torque requirement with the set step length, and the engine torque is output;
step S4, storing gas circuit torque, and delaying an ignition angle when the gas circuit torque follows the torque required by the driver;
step S5, when the gas circuit torque reserve meets the condition of high lift switching low lift (namely the gas circuit torque corresponding to the target low lift is equal to or higher than the driver required torque), responding to the switching request of high lift switching low lift;
and step S6, when the first cylinder with high lift and low lift switched finishes the air inlet with low lift, the flame path torque follows the air path torque, the ignition angle is quickly advanced, and the engine torque is output.
In the present embodiment, in step S4, the gas path torque reserve may be performed by increasing the throttle or boost. Of course, in other embodiments, other ways of storing the air path torque may be adopted, which is not limited in this embodiment.
In step S1, it is determined that the high-low lift switch request is present when the amount of change in the driver required torque exceeds a preset threshold.
The variable lift control method and the variable lift control system can improve the step problem of the output torque of the engine when the two-stage variable lift is changed, improve the driving feeling of a driver, fully ensure the engine dynamic property and the fuel economy of the two-stage intake lift, and limit and protect the dynamic load of an engine power assembly.
Based on the two embodiments, the embodiment of the present invention further provides a readable storage medium, on which a computer program is stored, wherein the computer program, when executed by a processor, can implement the engine torque control method of the first embodiment or the second embodiment.
These computer programs may be provided to a processor of a general purpose computer, special purpose computer, or other programmable data processing apparatus to produce a machine, such that the programs, which execute via the processor of the computer or other programmable data processing apparatus, implement the functions/acts specified in the flowchart and/or block diagram block or blocks. These computer programs may also be stored in a readable storage medium that can direct a computer, programmable data processing apparatus, and/or other devices to function in a particular manner. The computer program may also be loaded onto a computer, other programmable data processing apparatus, or other devices to cause a series of operational steps to be performed on the computer, other programmable apparatus or other devices to produce a computer implemented process such that the computer program which executes on the computer, other programmable apparatus or other devices implements the functions/acts specified in the flowchart and/or block diagram block or blocks.
The present invention has been described in detail with reference to the specific embodiments, which are merely preferred embodiments of the present invention, and the present invention is not limited to the above embodiments. Equivalent alterations and modifications of the above-described elements by those skilled in the art should be considered to be within the scope of the invention as hereinafter claimed, without departing from the principles of the invention.
Claims (9)
1. A method of controlling engine torque for two-step valve lift variation,
in the process of switching the high lift range from the low lift range, the gas path torque quickly follows the torque required by a driver, and the gas path torque gradually follows the gas path torque by a set step length, so that the torque output of the engine is smooth; when a switching request of switching a high lift range by a low lift range is responded, the gas path torque quickly follows the torque required by the driver, the gas path torque gradually follows the gas path torque by a set step length, and an ignition angle is quickly delayed and then advanced according to the gas path torque requirement of following the gas path torque by the set step length;
in the process of switching high lift to low lift, gas circuit torque storage is carried out, the gas circuit torque is synchronously kept to follow the driver required torque, and when the gas circuit torque meets the driver required torque, the gas circuit torque is enabled to quickly follow the gas circuit torque, so that the torque output of an engine is smooth; when a switching request of switching a high lift range and a low lift range is identified, gas path torque storage is carried out, the flame path torque is kept to follow the torque required by the driver, and an ignition angle is delayed; when the gas circuit torque reserve meets the torque required by the driver, the gas circuit torque quickly follows the torque required by the driver in response to the switching request of switching the high lift and the low lift, so that the gas circuit torque quickly follows the gas circuit torque, and the ignition angle is quickly advanced.
2. The engine torque control method for two-step valve lift change according to claim 1, characterized by comprising the steps of:
step S1, judging whether a high-low lift switching request exists according to the change of the torque required by the driver in the current driving cycle, if so, entering step S2, otherwise, the flame path torque continuously follows the gas path torque, the ignition angle responds to the torque required by the flame path, and the engine torque is output;
step S2, judging whether the request is a switching request of switching the low lift and the high lift, if so, responding to the switching request, and going to step S3, otherwise, going to step S4;
step S3, when the first cylinder with low lift and high lift switched finishes the air intake with high lift, calculating the step amount of the gas path torque of the first cylinder with high lift air intake, enabling the gas path torque to follow the gas path torque with a set step length according to the step amount of the gas path torque, quickly delaying the ignition angle, then advancing according to the gas path torque requirement with the set step length, and outputting the engine torque;
step S4, storing gas circuit torque, and delaying an ignition angle when the gas circuit torque follows the torque required by the driver;
step S5, when the gas circuit torque reserve meets the condition of high lift switching low lift, responding the switching request of high lift switching low lift;
and step S6, when the first cylinder with high lift and low lift switched finishes the air intake with low lift, the flame path torque follows the air path torque, the ignition angle is rapidly advanced, and the engine torque is output.
3. The method as claimed in claim 1 or 2, characterized in that during the low lift and high lift switching, the flame path torque follows the gas path torque in fixed steps on the premise of meeting driving smoothness.
4. The engine torque control method for two-step valve lift change according to claim 3, characterized in that the fixed step size is 10N-15N-m.
5. The engine torque control method for two-step valve lift variation according to claim 1, characterized in that the gas circuit torque meeting the driver demand torque during high-lift to low-lift switching means that the gas circuit torque corresponding to the target low-lift is equal to or higher than the driver demand torque.
6. The engine torque control method for two-step valve lift change according to claim 2, characterized in that in step S5, the condition for high lift to switch low lift is that the gas path torque corresponding to the target low lift is equal to or higher than the driver demand torque.
7. The engine torque control method for two-step valve lift change according to claim 2, characterized in that in step S4, the gas path torque reserve is performed by increasing throttle or boost.
8. The engine torque control method for two-step valve lift change according to claim 2, characterized in that in step S1, it is determined that there is a high-low lift switch request when the amount of change in driver demand torque exceeds a preset threshold.
9. A readable storage medium, having stored thereon a computer program, characterized in that the computer program, when executed with a processor, is capable of implementing the engine torque control method of any one of claims 1 to 8.
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| CN114033524B (en) * | 2021-11-09 | 2022-09-27 | 上海汽车集团股份有限公司 | Two-stage variable valve lift control method and system |
| CN115370496B (en) * | 2022-05-17 | 2023-12-26 | 东风汽车集团股份有限公司 | Method for controlling torque of gas circuit of turbocharged engine |
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| JP2005171862A (en) * | 2003-12-10 | 2005-06-30 | Denso Corp | Control device for internal combustion engine |
| CN101429881A (en) * | 2007-10-19 | 2009-05-13 | 通用汽车环球科技运作公司 | Variable valve lift transition control methods and systems |
| CN101705879A (en) * | 2008-05-08 | 2010-05-12 | 通用汽车环球科技运作公司 | Managing lean air/fuel transients in coordinated torque control |
| DE102010012127B3 (en) * | 2010-03-20 | 2011-07-07 | Dr. Ing. h.c. F. Porsche Aktiengesellschaft, 70435 | Method for operating internal combustion engine, involves temporarily executing multi-point injection during switching of valve lift, such that stepwise increasing of engine torque is balanced during switching of valve lift |
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| US7013852B2 (en) * | 2003-03-06 | 2006-03-21 | Denso Corporation | Control apparatus for an internal combustion engine |
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| JP2005171862A (en) * | 2003-12-10 | 2005-06-30 | Denso Corp | Control device for internal combustion engine |
| CN101429881A (en) * | 2007-10-19 | 2009-05-13 | 通用汽车环球科技运作公司 | Variable valve lift transition control methods and systems |
| CN101705879A (en) * | 2008-05-08 | 2010-05-12 | 通用汽车环球科技运作公司 | Managing lean air/fuel transients in coordinated torque control |
| DE102010012127B3 (en) * | 2010-03-20 | 2011-07-07 | Dr. Ing. h.c. F. Porsche Aktiengesellschaft, 70435 | Method for operating internal combustion engine, involves temporarily executing multi-point injection during switching of valve lift, such that stepwise increasing of engine torque is balanced during switching of valve lift |
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