CN115217638A - Engine compression ratio control method and device and electronic equipment - Google Patents

Engine compression ratio control method and device and electronic equipment Download PDF

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Publication number
CN115217638A
CN115217638A CN202210598443.XA CN202210598443A CN115217638A CN 115217638 A CN115217638 A CN 115217638A CN 202210598443 A CN202210598443 A CN 202210598443A CN 115217638 A CN115217638 A CN 115217638A
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compression ratio
working condition
engine
current
target
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CN115217638B (en
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罗海鹏
何炎迎
江武
吴广权
占文锋
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Guangzhou Automobile Group Co Ltd
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Guangzhou Automobile Group Co Ltd
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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
    • F02D15/00—Varying compression ratio

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  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Output Control And Ontrol Of Special Type Engine (AREA)

Abstract

The application belongs to the technical field of engine control, and particularly relates to a method and a device for controlling a compression ratio of an engine and electronic equipment. The engine compression ratio control method includes: acquiring operation parameters of the engine, and determining the current working condition of the engine according to the operation parameters; comparing the current working condition with the target working condition, and determining whether the compression ratio state needs to be switched according to the comparison result; when the compression ratio state switching is determined to be needed, the duty ratio of an executing mechanism of the engine compression ratio is controlled according to the difference between the current working condition and the target working condition so as to adjust the compression ratio of the engine. Therefore, when the compression ratio state switching is determined to be needed, the duty ratio of the compression ratio executing mechanism of the engine can be controlled according to the difference between the current working condition and the target working condition so as to adjust the compression ratio of the engine, so that the current compression ratio can be accurately controlled to be in the target state with high responsiveness, and the engine can be in a high-efficiency working state.

Description

Engine compression ratio control method and device and electronic equipment
Technical Field
The application belongs to the technical field of engine control, and particularly relates to a method and a device for controlling a compression ratio of an engine and electronic equipment.
Background
The variable compression ratio technology of the engine is a revolutionary technology of the engine, the high compression ratio can be adopted at the time of low load of the engine to improve the heat efficiency of the engine and reduce the oil consumption, and the low compression ratio can be adopted at the time of high load to improve the power and the torque of the engine so as to meet the dynamic requirement.
For the traditional constant compression ratio engine, the compression ratio is fixed by the physical structure of engine parts, and no control strategy related to the compression ratio exists, so that the traditional constant compression ratio engine cannot be fully compatible with the requirements of high efficiency and high dynamic property.
It is to be noted that the information disclosed in the above background section is only for enhancement of understanding of the background of the present application and therefore may include information that does not constitute prior art known to a person of ordinary skill in the art.
Disclosure of Invention
The application aims to provide an engine compression ratio control method, an engine compression ratio control device and electronic equipment, which can be compatible with high efficiency and high dynamic performance to a certain extent.
Other features and advantages of the present application will be apparent from the following detailed description, or may be learned by practice of the application.
According to an aspect of an embodiment of the present application, there is provided an engine compression ratio control method including:
obtaining operation parameters of an engine, and determining the current working condition of the engine according to the operation parameters;
comparing the current working condition with a target working condition, and determining whether the compression ratio state needs to be switched according to a comparison result;
and when the compression ratio state switching is determined to be needed, controlling the duty ratio of an actuating mechanism of the engine compression ratio according to the difference between the current working condition and the target working condition so as to adjust the compression ratio of the engine.
According to an aspect of an embodiment of the present application, there is provided an engine compression ratio control apparatus including:
the acquisition module is used for acquiring the operating parameters of the engine and determining the current working condition of the engine according to the operating parameters;
the determining module is used for comparing the current working condition with a target working condition and determining whether the compression ratio state needs to be switched according to a comparison result;
and the switching module is used for controlling the duty ratio of an actuating mechanism of the engine compression ratio according to the difference between the current working condition and the target working condition when the compression ratio state switching is determined to be required so as to adjust the compression ratio of the engine.
In some embodiments of the application, based on the above technical solution, the determining module is further configured to obtain a preset working condition partition map; determining the region of the current working condition on the working condition partition map and the region of the target working condition on the working condition partition map; and if the region to which the current working condition belongs and the region to which the target working condition belongs are different regions, determining that the compression ratio state needs to be switched.
In some embodiments of the present application, based on the above technical solution, the operation division map includes a horizontal axis representing an engine speed and a vertical axis representing the engine load; the determining module is further configured to obtain a current rotating speed and a current load corresponding to the current working condition, and determine an area to which the current working condition belongs on the working condition partition map according to a position of the current rotating speed on the horizontal axis and a position of the current load on the vertical axis; and acquiring a target rotating speed and a target load corresponding to the target working condition, and determining the region of the target working condition on the working condition partition diagram according to the position of the target rotating speed on the horizontal axis and the position of the target load on the vertical axis.
In some embodiments of the present application, based on the above technical solution, the switching module is further configured to control the actuator according to a first duty ratio when it is required to switch from a high compression ratio state to a low compression ratio state; controlling the current load or the current rotating speed to gradually rise, and executing a compression ratio switching action when the current load reaches a first critical load or the current rotating speed reaches a first critical rotating speed; controlling the actuating mechanism according to a preset first switching duty ratio, and executing a first preset time length; after the first preset time period is executed, controlling the executing mechanism according to a second duty ratio; the first duty ratio is corresponding duty ratio information in a high compression ratio state, and the second duty ratio is corresponding duty ratio information in a low compression ratio state.
In some embodiments of the present application, based on the above technical solution, the switching module is further configured to control the actuator according to a second duty ratio when it is required to switch from the low compression ratio state to the high compression ratio state; controlling the current load or the current rotating speed to gradually reduce, and executing a compression ratio switching action when the current load reaches a second critical load or the current rotating speed reaches a second critical rotating speed; controlling the actuating mechanism according to a preset second switching duty ratio, and executing a second preset time length; after the second preset time period is executed, controlling the executing mechanism according to a first duty ratio; the first duty ratio is corresponding duty ratio information in a high compression ratio state, and the second duty ratio is corresponding duty ratio information in a low compression ratio state.
In some embodiments of the present application, based on the above technical solution, the determining module is further configured to keep the current compression ratio state if the region to which the current operating condition belongs and the region to which the target operating condition belongs are the same region.
In some embodiments of the present application, based on the above technical solutions, the apparatus further includes a feedback module, configured to obtain a position signal fed back by the actuator; and comparing the position signal with a preset target position signal, and determining whether the compression ratio of the engine reaches a target compression ratio according to a comparison result.
In some embodiments of the application, based on the above technical solution, the apparatus further includes a stall module, configured to, when a stall instruction is received, if a current rotation speed corresponding to the current operating condition is less than or equal to a second critical rotation speed and a current load corresponding to the current operating condition is less than or equal to a second critical load, control the execution mechanism according to a first duty ratio; if the current rotating speed corresponding to the current working condition is greater than the second critical rotating speed and the current load corresponding to the current working condition is greater than the second critical load, controlling to reduce the current rotating speed and the current load; when the current rotating speed reaches a first critical rotating speed and the current load reaches a first critical load, controlling the executing mechanism according to a preset second switching duty ratio, and executing a second preset duration; after the second preset time is executed, controlling the executing mechanism according to the first duty ratio; wherein the first critical rotation speed is less than the second critical rotation speed, and the first critical load is less than the second critical load.
According to an aspect of an embodiment of the present application, there is provided a computer readable medium having stored thereon a computer program which, when executed by a processor, implements an engine compression ratio control method as in the above technical solution.
According to an aspect of an embodiment of the present application, there is provided an electronic apparatus including: a processor; and a memory for storing executable instructions of the processor; wherein the processor is configured to execute the engine compression ratio control method as in the above technical solution via execution of the executable instructions.
According to an aspect of an embodiment of the present application, there is provided a computer program product or a computer program comprising computer instructions stored in a computer readable storage medium. The processor of the computer device reads the computer instructions from the computer-readable storage medium, and the processor executes the computer instructions, so that the computer device executes the engine compression ratio control method as in the above technical solution.
In the technical scheme provided by the embodiment of the application, the current working condition is compared with the eye working condition, and then whether the compression ratio state switching is needed or not is determined according to the comparison result, so that the compression ratio state can be timely adjusted according to the actual requirement of the current working condition to meet the requirement of the engine compression ratio. In addition, when the compression ratio state switching is determined to be needed, the rotation of a compression ratio executing mechanism of the engine is controlled according to the difference between the current working condition and the target working condition, and when the difference is different in size, different control strategies are adopted for controlling, so that the current compression ratio can be accurately controlled to be in the target state with high responsiveness, the engine can further reach a high-efficiency working state, and the requirements of the engine on high efficiency and high dynamic are met.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the application.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and together with the description, serve to explain the principles of the application. It is obvious that the drawings in the following description are only some embodiments of the application, and that for a person skilled in the art, other drawings can be derived from them without inventive effort.
Fig. 1 schematically shows a flow of steps of a method for controlling an engine compression ratio according to an embodiment of the present application.
Fig. 2 schematically shows a flow of steps of comparing the current operating condition with the target operating condition and determining whether the compression ratio state needs to be switched according to the comparison result in an embodiment of the present application.
FIG. 3 is a graphical illustration of engine operating range partitioning in an embodiment of the present application.
Fig. 4 schematically shows a flow of steps of controlling the duty ratio of the actuator of the engine compression ratio to adjust the compression ratio of the engine according to the difference between the current operating condition and the target operating condition in an embodiment of the present application.
Fig. 5 schematically shows a flow of steps of controlling the duty ratio of the actuator of the engine compression ratio to adjust the compression ratio of the engine according to the difference between the current operating condition and the target operating condition in an embodiment of the present application.
Fig. 6 schematically shows a block diagram of the structure of an engine compression ratio control apparatus provided in the embodiment of the present application.
FIG. 7 schematically illustrates a block diagram of a computer system suitable for use in implementing an electronic device of an embodiment of the present application.
Detailed Description
Example embodiments will now be described more fully with reference to the accompanying drawings. Example embodiments may, however, be embodied in many different forms and should not be construed as limited to the examples set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of example embodiments to those skilled in the art.
Furthermore, the described features, structures, or characteristics may be combined in any suitable manner in one or more embodiments. In the following description, numerous specific details are provided to give a thorough understanding of embodiments of the application. One skilled in the relevant art will recognize, however, that the subject matter of the present application can be practiced without one or more of the specific details, or with other methods, components, devices, steps, and so forth. In other instances, well-known methods, devices, implementations, or operations have not been shown or described in detail to avoid obscuring aspects of the application.
The block diagrams shown in the figures are functional entities only and do not necessarily correspond to physically separate entities. I.e. these functional entities may be implemented in the form of software, or in one or more hardware modules or integrated circuits, or in different networks and/or processor means and/or microcontroller means.
The flow charts shown in the drawings are merely illustrative and do not necessarily include all of the contents and operations/steps, nor do they necessarily have to be performed in the order described. For example, some operations/steps may be decomposed, and some operations/steps may be combined or partially combined, so that the actual execution sequence may be changed according to the actual situation.
The following describes the engine compression ratio control method, device and electronic device provided by the present application in detail with reference to the specific embodiments.
Referring to fig. 1, fig. 1 schematically shows a flow of steps of an engine compression ratio control method provided in an embodiment of the present application. The execution subject for the engine compression ratio control method may be a controller, and may mainly include steps S101 to S103 as follows.
And S101, acquiring the operating parameters of the engine, and determining the current working condition of the engine according to the operating parameters.
The operating parameters of the engine may include, for example, a rotation speed, a load, gear information of the vehicle, an accelerator opening degree, and other information. The operation parameters of the engine are obtained, so that the current working condition of the engine can be determined. By determining the current working condition of the engine, whether the compression ratio state switching is needed or not is convenient to determine so as to meet the compression ratio requirement of the engine.
And S102, comparing the current working condition with the target working condition, and determining whether the compression ratio state needs to be switched according to the comparison result.
The target working condition is preset, and specifically, during the operation of the engine of the vehicle, the controller needs to determine the target working condition of the engine in advance according to the operation data (such as the requirements of the accelerator opening and the gear information) of the vehicle. Further, a target compression ratio demanded of the engine may be determined by the target operating condition.
After the current working condition and the target working condition are obtained, the current working condition is compared with the target working condition, and then whether the compression ratio state needs to be switched or not is determined according to the comparison result. Here, the compression ratio state switching refers to switching from one compression ratio state to another compression ratio state, for example, switching from a high compression ratio state to a low compression ratio state, or switching from a low compression ratio state to a high compression ratio state.
If the compression ratio states of the engine and the target working condition are the same, namely both the engine and the target working condition belong to a high compression ratio state or a low compression ratio state, the compression ratio state of the engine does not need to be switched. If the compression ratio states of the two are different, the compression ratio state of the engine needs to be switched. Therefore, the current working condition of the engine is compared with the target working condition, and whether the compression ratio state switching is needed or not is determined according to the comparison result, so that the judgment result is more accurate.
And step S103, when the compression ratio state switching is determined to be needed, controlling the duty ratio of an executing mechanism of the engine compression ratio according to the difference between the current working condition and the target working condition so as to adjust the compression ratio of the engine.
When the compression ratio state is determined to be required to be switched, different compression ratio control strategies are adopted according to the difference between target working conditions of the current working conditions, the duty ratio of an actuating mechanism of the engine compression ratio is controlled, the length of a connecting rod connected with the actuating mechanism is adjusted by controlling the duty ratio of the actuating mechanism, the position of a piston of the engine is controlled by adjusting the length of the connecting rod, the compression ratio of the engine is adjusted, and the purpose of accurately controlling the compression ratio of the engine is achieved.
In the technical scheme provided by the embodiment of the application, the current working condition is compared with the eye working condition, and then whether the compression ratio state switching is needed or not is determined according to the comparison result, so that the compression ratio state can be timely adjusted according to the actual requirement of the current working condition to meet the requirement of the engine compression ratio. In addition, when the compression ratio state switching is determined to be needed, the rotation of a compression ratio executing mechanism of the engine is controlled according to the difference between the current working condition and the target working condition, and when the difference is different in size, different control strategies are adopted for controlling, so that the current compression ratio can be accurately controlled to be in the target state with high responsiveness, the engine can further reach a high-efficiency working state, and the requirements of the engine on high efficiency and high dynamic are met.
In one embodiment of the present application, the engine compression ratio control method further includes: after the engine is powered on, the controller checks whether the compression ratio sensor fails; and after an engine ECU (Electronic Control Unit) is powered on every time, a compression ratio actuating mechanism (such as a motor or an Electronic oil pump) of the engine is controlled to perform self-checking so as to determine whether any fault condition such as hardware damage, incapability of electrifying, unreasonable signal and the like occurs in the compression ratio actuating mechanism.
Wherein, for the self-checking of the actuator, whether the actuator is in failure can be determined by the position signal fed back by the self-checking. Specifically, if the position P fed back by the actuator is within a preset range, it is determined that the actuator is not malfunctioning. For example, if P min ≤P≤P max If so, the executive electrical appliance can work normally, otherwise, P < P min Or P > P max The actuator fails.
If the compression ratio sensor is normal and has no fault, and the compression ratio executing mechanism is normal and has no fault, the engine enters a normal mode, namely the current working condition is compared with the target working condition, whether the compression ratio state switching is needed or not is determined according to the comparison result, and when the compression ratio state switching is determined to be needed, the duty ratio of the executing mechanism of the engine compression ratio is controlled according to the difference between the current working condition and the target working condition so as to adjust the compression ratio of the engine.
If the compression ratio sensor is in fault and the actuating mechanism is not in fault, an alarm is given to prompt a user that the compression ratio sensor is in fault and the actuating mechanism works according to a high compression ratio. If the compression ratio sensor fails and the execution mechanism fails, the actual compression ratio cannot be obtained in time, and the compression ratio execution mechanism cannot operate, namely the execution mechanism cannot receive an execution command fed back by the ECU to perform compression ratio maintaining and switching actions, namely the compression ratio is out of control, the engine is controlled to give an alarm, the engine is limited in speed and torque until the engine is stopped, and the compression ratio system is controlled to enter a failure mode. If the compression ratio sensor is not provided in the configuration, it is not necessary to check whether or not the compression ratio sensor is malfunctioning.
Therefore, the compression ratio sensor and the executing mechanism are subjected to fault detection, when the compression ratio sensor fails and the executing mechanism fails, the engine is controlled to give an alarm, the engine is limited in speed and torsion until the engine is stopped, engine parts can be prevented from being further damaged, and safety accidents of the whole vehicle and personnel can be reduced to a certain extent.
In an embodiment of the present application, referring to fig. 2, fig. 2 schematically shows a flow of steps of comparing a current operating condition with a target operating condition and determining whether a compression ratio state switching is required according to a comparison result in an embodiment of the present application. The comparing the current operating condition with the target operating condition, and determining whether the compression ratio state switching is required according to the comparison result may specifically include the following steps S201 to S203.
Step S201, obtaining a preset working condition partition Map, that is, obtaining a preset Map, where the Map in the motor is a data curve generated during motor testing, and mainly reflects a motor efficiency distribution Map under different rotation speeds and torques.
Step S202, determining the area of the current working condition on the working condition partition map and the area of the target working condition on the working condition partition map.
After the preset working condition partition map is obtained, according to the area of the current working condition on the working condition partition map and the area of the target working condition on the working condition partition map, the area of the current working condition and the area of the target working condition are determined, and whether the compression ratio corresponding to the current working condition is adjusted or not is determined so as to meet the compression ratio requirement of the engine. The preset working condition partition diagram comprises a plurality of working condition areas, each working condition area corresponds to a target compression ratio, after the target rotating speed and the target load are determined, the area to which the target working condition point belongs is determined according to the target rotating speed and the target load, and the target compression ratio of the area to which the target working condition point belongs is used as the target compression ratio required by the engine.
For example, engine speed and load are divided into two operating regions: the target compression ratio corresponding to the first region is a first target compression ratio, and the target compression ratio corresponding to the second region is a second target compression ratio; if the region to which the target working condition point belongs is determined to be a first region according to the target rotating speed and the target load, the first target compression ratio is used as the target compression ratio required by the engine; and determining that the region to which the target working condition point belongs is a second region according to the target rotating speed and the target load, and taking the second target compression ratio as the target compression ratio required by the engine.
Step S203, if the region to which the current operating condition belongs and the region to which the target operating condition belongs are different regions, it is determined that the compression ratio state needs to be switched.
Taking the example that the working condition region includes a first region and a second region, where the first region corresponds to a high compression ratio and the second region corresponds to a low compression ratio, if the region to which the current working condition belongs is the first region and the region to which the target working condition belongs is the second region, and at this time, the region to which the current working condition belongs and the region to which the target working condition belongs are different regions, it is determined that the compression ratio state switching is required. Similarly, if the area to which the current operating condition belongs is the first area, the area to which the target operating condition belongs is the second area, and the area to which the current operating condition belongs and the area to which the target operating condition belongs are different areas, it is determined that the compression ratio state switching is required.
Therefore, by predetermining the region to which the current working condition belongs and the region to which the target working condition belongs, if the region to which the current working condition belongs and the region to which the target working condition belongs are different, the compression ratio state switching needs to be determined, so that the compression ratio of the engine can be accurately controlled.
In one embodiment of the present application, the operating condition zone map includes a horizontal axis representing engine speed and a vertical axis representing engine load;
determining the region to which the current working condition belongs on the working condition partition map and the region to which the target working condition belongs on the working condition partition map, wherein the determining comprises the following steps of:
acquiring a current rotating speed and a current load corresponding to the current working condition, and determining an area of the current working condition on a working condition partition diagram according to the position of the current rotating speed on a horizontal axis and the position of the current load on a vertical axis;
and acquiring a target rotating speed and a target load corresponding to the target working condition, and determining the region of the target working condition on the working condition partition map according to the position of the target rotating speed on the horizontal axis and the position of the target load on the vertical axis.
For example, referring to FIG. 3, FIG. 3 is a graphical illustration of engine division into zones in one embodiment of the present application. The operation condition division map is divided into a first region (region A), a transition region (region C) and a second region (region B) according to the rotation speed and the load of the engine, wherein the transition region C is the operation condition region between the first region A and the second region B, and a first critical rotation speed n between the first region A and the transition region C is taken as an example h First critical load b between first region A and transition region C h (ii) a Second critical load B between second region B and transition region C l Second critical speed n between second region B and transition region C l 。
When determining the region to which the current working condition belongs on the working condition partition map and the region to which the target working condition belongs on the working condition partition map. Taking the determination of the region to which the current working condition belongs on the working condition partition map as an example, assuming that the current rotating speed of the engine is n and the current load of the engine is b, determining the region to which the current working condition belongs on the working condition partition map by the following method:
if n is less than or equal to n h And b is less than or equal to b h If the current working condition of the engine belongs to the first region A, judging that the current working condition of the engine belongs to the first region A;
if n is h <n<n l And b is h <b<b l If the current working condition of the engine belongs to the transition region C, judging that the current working condition of the engine belongs to the transition region C;
if n is greater than or equal to n l And b is not less than b l And if so, the region to which the current operating point of the engine belongs is a second region B.
Similarly, the region to which the target operating condition belongs on the operating condition partition map is determined according to the same method, and details are not repeated here.
In this way, the region of the current working condition on the working condition partition map is determined by acquiring the current rotating speed and the current load corresponding to the current working condition, according to the position of the current rotating speed on the horizontal axis and the position of the current load on the vertical axis, and the region of the target working condition on the working condition partition map is determined according to the position of the target rotating speed on the horizontal axis and the position of the target load on the vertical axis, so that the determination of the difference between the current working condition and the target working condition is facilitated, and the adopted compression ratio control strategy is further determined, so that the accurate control of the compression ratio is realized.
In one embodiment of the present application, referring to fig. 4, fig. 4 schematically shows a process of controlling the duty ratio of the actuator of the engine compression ratio to adjust the compression ratio of the engine according to the difference between the current operating condition and the target operating condition in an embodiment of the present application. When it is determined that the compression ratio state needs to be switched, controlling the duty ratio of an execution mechanism of the engine compression ratio according to the difference between the current working condition and the target working condition so as to adjust the compression ratio of the engine, which specifically includes the following steps S401 to S404.
In step S401, when it is necessary to switch from the high compression ratio state to the low compression ratio state, the actuator is controlled according to the first duty ratio.
Wherein the first duty ratio is corresponding duty ratio information in a high compression ratio state. When the high compression ratio state needs to be switched to the low compression ratio state, the actuating mechanism is controlled according to the corresponding duty ratio in the high compression ratio state. For example, the current working condition corresponds to an area A, the target working condition corresponds to an area B, the area A corresponds to a high compression ratio state, the area B corresponds to a low compression ratio state, and when the high compression ratio state needs to be switched to the low compression ratio state, the actuator is controlled according to a preset duty ratio of the area A.
And step S402, controlling the current load or the current rotating speed to gradually rise, and executing a compression ratio switching action when the current load reaches a first critical load or the current rotating speed reaches a first critical rotating speed.
Next, the current load or the current rotation speed is gradually increased, and the compression ratio switching action is performed when the current load reaches the first critical load or the current rotation speed reaches the first critical rotation speed, that is, when the critical state is between the a region and the C region.
In step S403, the actuator is controlled according to the preset first switching duty ratio, and a first preset time period is executed.
The preset first switching duty ratio is a duty ratio signal of an actuating mechanism when the engine sends a command of switching from a high compression ratio state to a low compression ratio state.
And step S404, after the first preset time period is executed, controlling the executing mechanism according to the second duty ratio.
The first duty ratio is corresponding duty ratio information in a high compression ratio state, and the second duty ratio is corresponding duty ratio information in a low compression ratio state.
For convenience of understanding the scheme of this embodiment, for example, the following description is given, where the region to which the current operating condition belongs is not in the same region as the region to which the target operating condition belongs, and the load of the target operating condition is higher than that of the current operating condition, if the current operating point of the engine is in the region a, the engine still operates according to MapA control parameter corresponding to the region a, and the electrical appliance is operated according to the corresponding hold-state duty cycle f h_keep (first duty cycle) control; when the engine load or speed is gradually increased, the corresponding load and speed limit, e.g. b, is triggered h (first critical load), n h (first critical speed), the executive electric appliance is not in the original keeping state f h_keep Instead, the compression ratio switching operation is started and the duty ratio f is set h (preset first switching duty cycle) signal control; and the execution time is t h (ii) a Execution time t h Then, the executive electrical appliance is in duty ratio f l_keep (second duty cycle) control.
Therefore, when the high compression ratio state is required to be switched to the low compression ratio state, the executing mechanism is controlled by using different duty ratios according to the change of the region to which the working condition belongs, so that the compression ratio state is adjusted in time according to the actual requirement of the current working condition, and the requirement of the compression ratio of the engine is further met.
In one embodiment of the present application, referring to fig. 5, fig. 5 schematically shows a process of controlling the duty ratio of the actuator of the engine compression ratio to adjust the compression ratio of the engine according to the difference between the current operating condition and the target operating condition in an embodiment of the present application. When it is determined that the compression ratio state needs to be switched, controlling the duty ratio of an execution mechanism of the engine compression ratio according to the difference between the current working condition and the target working condition so as to adjust the compression ratio of the engine, which specifically includes the following steps S501 to S504.
In step S501, when it is necessary to switch from the low compression ratio state to the high compression ratio state, the actuator is controlled according to the second duty ratio.
Wherein the second duty is duty information corresponding to a low compression ratio state. When the low compression ratio state is required to be switched to the high compression ratio state, the actuating mechanism is controlled according to the corresponding duty ratio in the low compression ratio state. For example, the current working condition corresponds to a B area, the target working condition corresponds to an A area, the A area corresponds to a high-compression ratio state, the B area corresponds to a low-compression ratio state, and when the low-compression ratio state needs to be switched to the high-compression ratio state, the actuating mechanism is controlled according to a duty ratio preset in the B area.
Step S502, the current load or the current rotating speed is controlled to be gradually reduced, and when the current load reaches a second critical load or the current rotating speed reaches a second critical rotating speed, a compression ratio switching action is executed.
Next, the current load or the current rotation speed is gradually decreased, and the compression ratio switching action is performed when the current load reaches the second critical load or the current rotation speed reaches the second critical rotation speed, that is, when the critical state is between the B region and the C region.
Step S503, controlling the actuator according to the preset second switching duty ratio, and executing a second preset duration.
The preset second switching duty ratio is a duty ratio signal of the actuating mechanism when the engine sends a command of switching from a low compression ratio state to a high compression ratio state.
And step S504, after the second preset time period is executed, controlling the executing mechanism according to the first duty ratio.
To facilitate understanding of the solution of the embodiment, for example, when the current operating condition belonging region and the target operating condition belonging region are not in the same region, and the target operating condition is lower than the current operating condition load, if the current operating point of the engine is in the B region, the engine still operates according to MapB (MapB is a control parameter corresponding to the B region), and the electric appliance is executed according to the corresponding holding state duty ratio f l_keep (second duty cycle) control; when the engine load or speed is gradually reduced, the corresponding load and speed limit, e.g. b, is triggered l (second critical load), n l (second critical speed), the executive electric appliance is not in the original keeping state f l_keep Instead, the compression ratio switching operation is started and the duty ratio f is set l (preset second switching duty ratio) signal control, and the execution time is t l (ii) a Execution time t l Then, the executive electrical appliance is in duty ratio f h_keep (first duty cycle) control.
Therefore, when the low compression ratio state is required to be switched to the high compression ratio state, the executing mechanism is controlled by using different duty ratios according to the change of the region to which the working condition belongs, so that the compression ratio state is adjusted in time according to the actual requirement of the current working condition, and the requirement of the compression ratio of the engine is further met.
In an embodiment of the present application, comparing the current operating condition with the target operating condition, and determining whether the compression ratio state switching is required according to the comparison result, further includes:
and if the region to which the current working condition belongs and the region to which the target working condition belongs are in the same region, keeping the current compression ratio state.
After determining whether the compression ratio state of the engine needs to be switched or not, if the compression ratio state of the engine does not need to be switched, controlling the actuating mechanism by using the target duty ratio corresponding to the region to which the current working condition belongs. And because the compression ratio state switching between different working condition areas is not involved, the compression ratio is changed only in the area to which the current working condition belongs, and the engine can be controlled directly according to the engine control parameter corresponding to the area to which the current working condition belongs.
For example, if the region to which the current operating point belongs and the region to which the target operating point belongs both belong to a first region, the compression ratio executing mechanism is controlled according to a first duty ratio; if the area to which the current working condition point belongs and the area to which the target working condition point belongs both belong to a second area, controlling the compression ratio executing mechanism according to a second duty ratio; wherein the first duty cycle is greater than the second duty cycle.
Under the condition that the region to which the current working condition point belongs and the region to which the target working condition point belongs both belong to transition regions, determining a running path before entering the region to which the current working condition point belongs; if the running path before the region to which the current working point belongs enters a transition region from a first region, controlling an executing mechanism according to a first duty ratio; and if the running path before the zone to which the current working point belongs enters the transition zone from the second zone, controlling the compression ratio executing mechanism according to a second duty ratio.
Therefore, the accurate and efficient control of the compression ratio of the engine is realized, and the running stability of the engine is ensured.
In one embodiment of the present application, the engine compression ratio control method further includes:
acquiring a position signal fed back by an actuating mechanism;
and comparing the position signal with a preset target position signal, and determining whether the compression ratio of the engine reaches the target compression ratio according to the comparison result.
Specifically, after the electric appliance completes the compression ratio state switching, the electric appliance is in the compression ratio keeping duty ratio state f h_keep Or f l_keep The ECU judges whether the position signal P is consistent with the corresponding engine compression ratio or not through the feedback of the execution mechanism, namely the position signal is required to be compared with a preset target position signal, and whether the compression ratio of the engine is in place or not is judged.
For an engine with a compression ratio sensor:
if the compression ratio is ε tA When is, P hmin ≤P≤P hmax If the engine is out of the range, the engine is not adjusted in place, otherwise, the engine is over-limited, and in order to ensure the safety of the engine, the engine needs to be controlled to alarm, and the engine needs to be subjected to torque reduction and speed reduction until the engine is stopped.
If the compression ratio is ε tB When is, P lmin ≤P≤P lmax If the engine is out of the range, the engine is not adjusted in place, otherwise, the engine is over-limited, and in order to ensure the safety of the engine, the engine needs to be controlled to alarm, and the engine needs to be subjected to torque reduction and speed reduction until the engine is stopped.
If the compression ratio is ε tC The position signal for P should be opposite to the previous compression ratio state range, otherwise the limit is exceeded.
Judging the position of the working point of the current engine according to the rotating speed and the load for the engine without a compression ratio sensor;
and a region A: duty cycle of f h_keep ，P hmin ≤P≤P hma x, normal, otherwise, overrun;
and a B region: duty ratio of f l_kee p，P lmin ≤P≤P lmax If not, the operation is over-limit;
and a C region: duty cycle of f h_keep ，P hmin ≤P≤P hmax (ii) a If the duty ratio is f l_keep ，P lmin ≤P≤P lmax (ii) a Otherwise, exceeding the limit;
and (4) judging that the ECU exceeds the limit, alarming by the engine, limiting the speed and the torque, and finally stopping.
In this way, after the actuator completes the switching of the compression ratio state, it is necessary to determine whether the compression ratio of the engine reaches the target compression ratio, and if the position signal fed back by the actuator is within the preset target position signal range, it indicates that the compression ratio of the engine reaches the target compression ratio. If the position information fed back by the actuating mechanism is not within the preset target position signal range, the change of the compression ratio of the engine is indicated to be too fast or too slow, in order to ensure the safety of the engine, the engine needs to be controlled to give an alarm, and the engine needs to be subjected to torque reduction and speed reduction until the engine is stopped, so that the safe operation of the engine is ensured.
In one embodiment of the present application, the engine compression ratio control method further includes:
when a flameout instruction is received, if the current rotating speed corresponding to the current working condition is less than or equal to the second critical rotating speed and the current load corresponding to the current working condition is less than or equal to the second critical load, the executing mechanism is controlled according to the first duty ratio;
if the current rotating speed corresponding to the current working condition is greater than the second critical rotating speed and the current load corresponding to the current working condition is greater than the second critical load, controlling to reduce the current rotating speed and the current load;
when the current rotating speed reaches a first critical rotating speed and the current load reaches a first critical load, controlling the executing mechanism according to a preset second switching duty ratio, and executing a second preset duration;
after executing the second preset time, controlling the executing mechanism according to the first duty ratio;
the first critical rotating speed is less than the second critical rotating speed, and the first critical load is less than the second critical load.
For example, when a flameout command is received, if the engine operates in the A zone or the C zone, the execution electric appliance presses the f h_keep And (6) executing. When receiving a flameout command, the engine operates in the B area, the load and the rotating speed of the engine are reduced, and when triggering a boundary condition, the electric appliance is executed according to the f l Execution, duration t l And then the actuator maintains the duty ratio f at a high compression ratio h_keep And (5) controlling.
Therefore, when flameout execution is received, the engine can be controlled differently according to the current operation condition, and the control on the engine is facilitated.
In one embodiment of the application, the ECU judges whether the position signal P is consistent with the area of the high compression ratio A of the engine through the feedback of the actuating mechanism: p hmin ≤P≤P hmax If normal, the engine is powered off and flameout; if the engine is out of limit, the engine alarms and records the fault,and (5) stopping the machine.
It should be noted that although the various steps of the methods in this application are depicted in the drawings in a particular order, this does not require or imply that these steps must be performed in this particular order, or that all of the shown steps must be performed, to achieve desirable results. Additionally or alternatively, certain steps may be omitted, multiple steps combined into one step execution, and/or one step broken down into multiple step executions, etc.
The following describes embodiments of the apparatus of the present application that may be used to implement the engine compression ratio control method of the above-described embodiments of the present application. Fig. 6 schematically shows a block diagram of the structure of an engine compression ratio control apparatus provided in the embodiment of the present application. As shown in fig. 6, the compression ratio control apparatus 600 includes:
the acquisition module 601 is used for acquiring the operating parameters of the engine and determining the current working condition of the engine according to the operating parameters;
a determining module 602, configured to compare a current working condition with a target working condition, and determine whether compression ratio state switching is required according to a comparison result;
the switching module 603 is configured to, when it is determined that the compression ratio state needs to be switched, control a duty ratio of an actuator of the compression ratio of the engine according to a difference between a current working condition and a target working condition, so as to adjust the compression ratio of the engine.
In some embodiments of the application, based on the above technical solution, the determining module is further configured to obtain a preset working condition partition map; determining the area of the current working condition on the working condition partition map and the area of the target working condition on the working condition partition map; and if the region to which the current working condition belongs and the region to which the target working condition belongs are different regions, determining that the compression ratio state needs to be switched.
In some embodiments of the present application, based on the above technical solution, the operating condition partition map includes a horizontal axis representing an engine speed and a vertical axis representing an engine load; the determining module 602 is further configured to obtain a current rotation speed and a current load corresponding to the current working condition, and determine an area to which the current working condition belongs on the working condition partition map according to a position of the current rotation speed on a horizontal axis and a position of the current load on a vertical axis; and acquiring a target rotating speed and a target load corresponding to the target working condition, and determining the region of the target working condition on the working condition partition diagram according to the position of the target rotating speed on the horizontal axis and the position of the target load on the vertical axis.
In some embodiments of the present application, based on the above technical solution, the switching module 603 is further configured to control the actuator according to the first duty ratio when it is required to switch from the high compression ratio state to the low compression ratio state; controlling the current load or the current rotating speed to gradually rise, and executing a compression ratio switching action when the current load reaches a first critical load or the current rotating speed reaches a first critical rotating speed; controlling an actuating mechanism according to a preset first switching duty ratio, and executing a first preset time length; after the first preset time is executed, controlling the executing mechanism according to the second duty ratio so as to complete the compression ratio state switching of the engine; the first duty ratio is corresponding duty ratio information in a high compression ratio state, and the second duty ratio is corresponding duty ratio information in a low compression ratio state.
In some embodiments of the present application, based on the above technical solution, the switching module 603 is further configured to control the actuator according to a second duty ratio when it is required to switch from the low compression ratio state to the high compression ratio state; controlling the current load or the current rotating speed to gradually reduce, and executing a compression ratio switching action when the current load reaches a second critical load or the current rotating speed reaches a second critical rotating speed; controlling the actuating mechanism according to a preset second switching duty ratio, and executing a second preset time length; after the second preset time is executed, controlling the executing mechanism according to the first duty ratio so as to complete the compression ratio state switching of the engine; the first duty ratio is corresponding duty ratio information in a high compression ratio state, and the second duty ratio is corresponding duty ratio information in a low compression ratio state.
In some embodiments of the present application, based on the above technical solution, the determining module 602 is further configured to maintain the current compression ratio state if the region to which the current operating condition belongs and the region to which the target operating condition belongs are the same region.
In some embodiments of the present application, based on the above technical solutions, the apparatus further includes a feedback module, configured to obtain a position signal fed back by the actuator; and comparing the position signal with a preset target position signal, and determining whether the compression ratio of the engine reaches the target compression ratio according to the comparison result.
In some embodiments of the application, based on the above technical solution, the apparatus further includes a stall module, configured to, when a stall instruction is received, if a current rotation speed corresponding to a current operating condition is less than or equal to a second critical rotation speed and a current load corresponding to the current operating condition is less than or equal to a second critical load, control the execution mechanism according to a first duty ratio; if the current rotating speed corresponding to the current working condition is greater than the second critical rotating speed and the current load corresponding to the current working condition is greater than the second critical load, controlling to reduce the current rotating speed and the current load; when the current rotating speed reaches a first critical rotating speed and the current load reaches a first critical load, controlling the executing mechanism according to a preset second switching duty ratio, and executing a second preset duration; after executing the second preset time, controlling the executing mechanism according to the first duty ratio; the first critical rotating speed is less than the second critical rotating speed, and the first critical load is less than the second critical load.
The specific details of the engine compression ratio control apparatus provided in each embodiment of the present application have been described in detail in the corresponding method embodiment, and are not described herein again.
Fig. 7 schematically shows a block diagram of a computer system of an electronic device for implementing an embodiment of the present application.
It should be noted that the computer system 700 of the electronic device shown in fig. 7 is only an example, and should not bring any limitation to the functions and the scope of use of the embodiments of the present application.
As shown in fig. 7, the computer system 700 includes a Central Processing Unit (CPU) 701 that can perform various appropriate actions and processes according to a program stored in a Read-Only Memory (ROM) 702 or a program loaded from a storage section 708 into a Random Access Memory (RAM) 703. In the random access memory 703, various programs and data necessary for system operation are also stored. The cpu 701, the rom 702, and the ram 703 are connected to each other via a bus 704. An Input/Output interface 705 (Input/Output interface, i.e., I/O interface) is also connected to the bus 704.
The following components are connected to the input/output interface 705: an input portion 706 including a keyboard, a mouse, and the like; an output section 707 including a Cathode Ray Tube (CRT), a Liquid Crystal Display (LCD), and a speaker; a storage section 708 including a hard disk and the like; and a communication section 709 including a network interface card such as a local area network card, a modem, and the like. The communication section 709 performs communication processing via a network such as the internet. A driver 710 is also connected to the input/output interface 705 as necessary. A removable medium 711 such as a magnetic disk, an optical disk, a magneto-optical disk, a semiconductor memory, or the like is mounted on the drive 710 as necessary, so that the computer program read out therefrom is mounted in the storage section 708 as necessary.
In particular, the processes described in the various method flowcharts may be implemented as computer software programs, according to embodiments of the present application. For example, embodiments of the present application include a computer program product comprising a computer program embodied on a computer readable medium, the computer program comprising program code for performing the method illustrated by the flow chart. In such an embodiment, the computer program can be downloaded and installed from a network through the communication section 709, and/or installed from the removable medium 711. The computer program, when executed by the central processor 701, performs various functions defined in the system of the present application.
It should be noted that the computer readable medium shown in the embodiments of the present application may be a computer readable signal medium or a computer readable storage medium or any combination of the two. A computer readable storage medium may be, for example, but not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any combination of the foregoing. More specific examples of the computer readable storage medium may include, but are not limited to: an electrical connection having one or more wires, a portable computer diskette, a hard disk, a Random Access Memory (RAM), a Read-Only Memory (ROM), an Erasable Programmable Read-Only Memory (EPROM), a flash Memory, an optical fiber, a portable Compact Disc Read-Only Memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing. In the present application, a computer readable storage medium may be any tangible medium that can contain, or store a program for use by or in connection with an instruction execution system, apparatus, or device. In this application, however, a computer readable signal medium may include a propagated data signal with computer readable program code embodied therein, for example, in baseband or as part of a carrier wave. Such a propagated data signal may take many forms, including, but not limited to, electro-magnetic, optical, or any suitable combination thereof. A computer readable signal medium may also be any computer readable medium that is not a computer readable storage medium and that can communicate, propagate, or transport a program for use by or in connection with an instruction execution system, apparatus, or device. Program code embodied on a computer readable medium may be transmitted using any appropriate medium, including but not limited to: wireless, wired, etc., or any suitable combination of the foregoing.
The flowchart and block diagrams in the figures illustrate the architecture, functionality, and operation of possible implementations of systems, methods and computer program products according to various embodiments of the present application. In this regard, each block in the flowchart or block diagrams may represent a module, segment, or portion of code, which comprises one or more executable instructions for implementing the specified logical function(s). It should also be noted that, in some alternative implementations, the functions noted in the block may occur out of the order noted in the figures. For example, two blocks shown in succession may, in fact, be executed substantially concurrently, or the blocks may sometimes be executed in the reverse order, depending upon the functionality involved. It will also be noted that each block of the block diagrams or flowchart illustration, and combinations of blocks in the block diagrams or flowchart illustration, can be implemented by special purpose hardware-based systems which perform the specified functions or acts, or combinations of special purpose hardware and computer instructions.
It should be noted that although in the above detailed description several modules or units of the device for action execution are mentioned, such a division is not mandatory. Indeed, the features and functions of two or more modules or units described above may be embodied in one module or unit according to embodiments of the application. Conversely, the features and functions of one module or unit described above may be further divided into embodiments by a plurality of modules or units.
Through the above description of the embodiments, those skilled in the art will readily understand that the exemplary embodiments described herein may be implemented by software, or by software in combination with necessary hardware. Therefore, the technical solution according to the embodiments of the present application can be embodied in the form of a software product, which can be stored in a non-volatile storage medium (which can be a CD-ROM, a usb disk, a removable hard disk, etc.) or on a network, and includes several instructions to enable a computing device (which can be a personal computer, a server, a touch terminal, or a network device, etc.) to execute the method according to the embodiments of the present application.
Other embodiments of the present application will be apparent to those skilled in the art from consideration of the specification and practice of the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of the invention following, in general, the principles of the application and including such departures from the present disclosure as come within known or customary practice within the art to which the invention pertains.
It will be understood that the present application is not limited to the precise arrangements described above and shown in the drawings and that various modifications and changes may be made without departing from the scope thereof. The scope of the application is limited only by the appended claims.

Claims (10)

1. A method of controlling an engine compression ratio, characterized by comprising:
obtaining operation parameters of an engine, and determining the current working condition of the engine according to the operation parameters;
comparing the current working condition with a target working condition, and determining whether compression ratio state switching is needed or not according to a comparison result;
and when the compression ratio state switching is determined to be needed, controlling the duty ratio of an actuating mechanism of the engine compression ratio according to the difference between the current working condition and the target working condition so as to adjust the compression ratio of the engine.
2. The engine compression ratio control method according to claim 1, wherein the comparing the current operating condition with the target operating condition and determining whether the compression ratio state switching is required according to the comparison result comprises:
acquiring a preset working condition partition map;
determining the region of the current working condition on the working condition partition map and the region of the target working condition on the working condition partition map;
and if the region to which the current working condition belongs and the region to which the target working condition belongs are different regions, determining that the compression ratio state needs to be switched.
3. The engine compression ratio control method according to claim 2, characterized in that the operating condition division map includes a horizontal axis representing an engine speed and a vertical axis representing the engine load;
the determining the region to which the current working condition belongs on the working condition partition map and the region to which the target working condition belongs on the working condition partition map includes:
acquiring a current rotating speed and a current load corresponding to the current working condition, and determining an area of the current working condition on the working condition partition map according to the position of the current rotating speed on the horizontal axis and the position of the current load on the vertical axis;
and acquiring a target rotating speed and a target load corresponding to the target working condition, and determining the region of the target working condition on the working condition partition map according to the position of the target rotating speed on the horizontal axis and the position of the target load on the vertical axis.
4. The engine compression ratio control method according to claim 3, characterized in that when it is determined that the compression ratio state switching is required, controlling the duty ratio of an actuator of the engine compression ratio according to the difference between the current operating condition and the target operating condition to adjust the compression ratio of the engine comprises:
when the high compression ratio state needs to be switched to the low compression ratio state, controlling the actuating mechanism according to a first duty ratio;
controlling the current load or the current rotating speed to gradually rise, and executing a compression ratio switching action when the current load reaches a first critical load or the current rotating speed reaches a first critical rotating speed;
controlling the actuating mechanism according to a preset first switching duty ratio, and executing a first preset time length;
after the first preset time period is executed, controlling the executing mechanism according to a second duty ratio;
the first duty ratio is corresponding duty ratio information in a high compression ratio state, and the second duty ratio is corresponding duty ratio information in a low compression ratio state.
5. The engine compression ratio control method according to claim 3, characterized in that when it is determined that the compression ratio state switching is required, controlling a duty ratio of an actuator of the engine compression ratio according to a difference between the current operating condition and the target operating condition to adjust the compression ratio of the engine, further comprises:
when the low-compression ratio state needs to be switched to the high-compression ratio state, controlling the actuating mechanism according to a second duty ratio;
controlling the current load or the current rotating speed to gradually reduce, and executing a compression ratio switching action when the current load reaches a second critical load or the current rotating speed reaches a second critical rotating speed;
controlling the actuating mechanism according to a preset second switching duty ratio, and executing a second preset time length;
after the second preset time period is executed, controlling the executing mechanism according to a first duty ratio;
the first duty ratio is corresponding duty ratio information in a high compression ratio state, and the second duty ratio is corresponding duty ratio information in a low compression ratio state.
6. The engine compression ratio control method according to claim 2, wherein the comparing the current operating condition with the target operating condition and determining whether the compression ratio state switching is required according to the comparison result further comprises:
and if the region to which the current working condition belongs and the region to which the target working condition belongs are the same, keeping the current compression ratio state.
7. The engine compression ratio control method according to claim 1, characterized by further comprising:
acquiring a position signal fed back by the actuating mechanism;
and comparing the position signal with a preset target position signal, and determining whether the compression ratio of the engine reaches a target compression ratio according to a comparison result.
8. The engine compression ratio control method according to any one of claims 1 to 7, characterized by further comprising:
when a flameout instruction is received, if the current rotating speed corresponding to the current working condition is less than or equal to a second critical rotating speed and the current load corresponding to the current working condition is less than or equal to a second critical load, controlling the executing mechanism according to a first duty ratio;
if the current rotating speed corresponding to the current working condition is greater than the second critical rotating speed and the current load corresponding to the current working condition is greater than the second critical load, controlling to reduce the current rotating speed and the current load;
when the current rotating speed reaches a first critical rotating speed and the current load reaches a first critical load, controlling the executing mechanism according to a preset second switching duty ratio, and executing a second preset duration;
after the second preset time is executed, controlling the executing mechanism according to the first duty ratio;
wherein the first critical rotation speed is less than the second critical rotation speed, and the first critical load is less than the second critical load.
9. An engine compression ratio control apparatus characterized by comprising:
the acquisition module is used for acquiring the operating parameters of the engine and determining the current working condition of the engine according to the operating parameters;
the determining module is used for comparing the current working condition with a target working condition and determining whether the compression ratio state needs to be switched according to a comparison result;
and the switching module is used for controlling the duty ratio of an actuating mechanism of the engine compression ratio according to the difference between the current working condition and the target working condition when the compression ratio state switching is determined to be required so as to adjust the compression ratio of the engine.
10. An electronic device, comprising:
a processor; and
a memory for storing executable instructions of the processor;
wherein the processor is configured to execute the engine compression ratio control method of any one of claims 1 to 8 via execution of the executable instructions.
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