CN111140387B - Control method for switching cylinder-failure mode - Google Patents
Control method for switching cylinder-failure mode Download PDFInfo
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- CN111140387B CN111140387B CN201911136366.0A CN201911136366A CN111140387B CN 111140387 B CN111140387 B CN 111140387B CN 201911136366 A CN201911136366 A CN 201911136366A CN 111140387 B CN111140387 B CN 111140387B
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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
- F02D41/30—Controlling fuel injection
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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
- F02D17/00—Controlling engines by cutting out individual cylinders; Rendering engines inoperative or idling
- F02D17/02—Cutting-out
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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
- F02D41/008—Controlling each cylinder individually
- F02D41/0087—Selective cylinder activation, i.e. partial cylinder operation
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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
- F02D41/02—Circuit arrangements for generating control signals
- F02D41/04—Introducing corrections for particular operating conditions
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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
- F02D41/30—Controlling fuel injection
- F02D41/3005—Details not otherwise provided for
Abstract
The invention belongs to the technical field of engines, in particular to a control method for switching a cylinder-failure mode, which comprises the steps of detecting whether a cylinder-failure requirement exists or not, determining that an engine continuously operates in a current mode according to the absence of the cylinder-failure requirement, determining that the engine is switched from the current mode to another mode to operate according to the existence of the cylinder-failure requirement, judging whether a switching moment is a cycle starting point or not, and controlling the engine to switch the modes according to the switching moment as the cycle starting point, wherein according to the control method for switching the cylinder-failure mode, the engine is controlled to be switched among a normal mode, the cylinder-failure mode and different cylinder-failure modes by detecting whether the cylinder-failure requirement exists or not, and the switching time point is controlled, the modes are switched at the cycle starting point, so that the instability of the operation of the engine caused by sudden switching is reduced, the stable output of the engine is improved.
Description
Technical Field
The invention belongs to the technical field of engines, and particularly relates to a control method for switching cylinder-cutoff modes.
Background
This section provides background information related to the present disclosure only and is not necessarily prior art.
The engine has wide working rotating speed and load range and poor fuel economy under low load rate, and the requirement for reducing the fuel consumption of the engine with multiple cylinders and large displacement is more urgent along with the stricter fuel consumption regulation, so that a cylinder breaking technology is provided. The cylinder breaking technology can close one or more cylinders when the engine is partially loaded, and in order to ensure that the power of the engine is unchanged, the load rate of the working cylinder needs to be increased, so that the mechanical efficiency of the engine is improved, the pumping loss is reduced, and the fuel economy is improved.
The switching of the operation mode of the engine is to switch immediately after receiving a switching instruction, the oil injection quantity increasing cylinder directly mutates to a calibrated oil injection quantity, the oil injection quantity reducing cylinder directly stops oil supply, in this way, the oil injection quantity has a certain step change process, and particularly, the oil injection quantity is more obvious under the condition of large change of the operating condition load rate, so that the power output of the engine jumps, the stable operation of the engine is influenced, aiming at the operation conditions of different engines, the execution time of the operation rule corresponding to the switching operation mode is the same, the stable operation of the engine is also influenced, and the change of the operation condition and the stable operation cannot be considered.
Disclosure of Invention
The invention aims to at least solve the problem of unstable operation caused by switching immediately after the engine receives a switching command. The purpose is realized by the following technical scheme:
the first aspect of the present invention provides a method for controlling cylinder deactivation mode switching, including:
detecting whether a cylinder breaking requirement exists;
determining that the engine continues to operate in a current mode according to the absence of the cylinder deactivation requirement;
according to the cylinder deactivation requirement, determining that the engine is switched to operate in another mode from a current mode;
judging whether the switching moment is a period starting point or not;
and controlling the engine to switch modes according to the switching time as a cycle starting point.
According to the control method for switching the cylinder-failure modes, whether the cylinder-failure requirement exists or not is detected, the engine is controlled to be switched between the modes according to the cylinder-failure requirement, the engine is controlled to continuously operate in the current mode without the cylinder-failure requirement, the engine is controlled to be switched between the normal mode, the cylinder-failure mode and the different cylinder-failure modes, the modes are switched at the starting point of the period, instability of engine operation caused by sudden switching is reduced, stable output of the engine is improved, the switching time point is controlled, the requirement of the engine can be quickly responded, the switched modes are matched with the operation working condition of the engine, and both the responsiveness and the stability of the engine can be considered.
In addition, the control method for switching the cylinder deactivation mode according to the embodiment of the invention can also have the following additional technical characteristics:
in some embodiments of the present invention, before said controlling said engine to switch from a current mode to another mode operation according to said cylinder deactivation demand, further comprises:
detecting whether the cylinder failure number of the current mode is zero or not;
the determining that the engine is switched from the current mode to another mode of operation according to the existence of the cylinder deactivation requirement comprises:
determining that the engine is switched from the current mode to the cylinder deactivation mode according to the fact that the cylinder deactivation number of the current mode is zero;
and determining that the engine is switched from the current mode to another mode according to the fact that the cylinder failure number of the current mode is not zero and is different from the cylinder failure requirement.
In some embodiments of the present invention, the determining that the engine is switched from the current mode to the deactivated mode according to the number of deactivated cylinders in the current mode being zero comprises:
determining whether the switched cylinder failure number of the engine is updated or not according to the fact that the cylinder failure number of the current mode is zero;
and updating according to the cylinder failure number after the mode of the engine is switched, and determining the cylinder failure number of the cylinder failure mode as the cylinder failure requirement.
In some embodiments of the present invention, before determining that the engine is switched from the current mode to another mode before the number of cylinder deactivation according to the current mode is not zero and is different from the cylinder deactivation requirement, the method further includes: calculating the working condition change grade of the engine;
the determining that the engine is switched from the current mode to the other mode according to the fact that the number of cylinder deactivation of the current mode is not zero and the number of cylinder deactivation is different from the cylinder deactivation requirement comprises:
determining whether the working condition change grade of the engine meets a first preset value or not according to the fact that the cylinder failure number of the current mode is not zero and is smaller than the cylinder failure requirement;
determining the mode switching moment of the engine according to the condition change grade of the engine meeting a first preset value;
and determining the cylinder breaking number of the other cylinder breaking mode as the cylinder breaking requirement.
In some embodiments of the present invention, the determining that the engine is switched from the current mode to the other mode further comprises:
determining whether the working condition change grade of the engine meets a second preset value or not according to the fact that the cylinder failure number of the current mode is not zero and is smaller than the cylinder failure requirement;
Determining the mode switching moment of the engine according to the condition change grade of the engine meeting a second preset value;
and determining the cylinder breaking number of the other cylinder breaking mode as the cylinder breaking requirement.
In some embodiments of the present invention, the determining that the engine is switched from the current mode to the other mode further comprises:
determining whether the cylinder breaking requirement is greater than the current cylinder breaking number of the engine according to the condition change grade of the engine not meeting the first preset value and the second preset value;
determining that the engine continues to operate in the current mode according to the fact that the cylinder breaking requirement is larger than the current cylinder breaking number of the engine;
and determining that the engine is switched to a normal mode to operate according to the fact that the cylinder breaking requirement is not larger than the current cylinder breaking number of the engine.
In some embodiments of the present invention, in the determining of the mode switching time of the engine according to the condition change level of the engine meeting a first preset value, the mode switching time is after the end of the current working cycle of the engine.
In some embodiments of the present invention, in the determining of the mode switching time of the engine according to the level of change of the operating condition of the engine satisfying a second preset value, the mode switching time is after the end of the current working cycle of the engine.
In some embodiments of the present invention, the determining whether the number of cylinder deactivation after the engine switching is updated according to the fact that the number of cylinder deactivation according to the current mode is zero comprises:
calculating the rate of change of the dependent variable
Calculating a peak value of the correlation change rate;
starting timing according to the fact that the peak value is smaller than a set value;
determining that a timer is reset and starts timing according to the fact that the peak value is larger than a set value;
and determining the number of cylinder breaks after the engine is switched to update according to the fact that the timing duration is greater than a time set value.
In some embodiments of the invention, in said calculating the rate of change of the correlation variable and the peak value of the rate of change of the correlation:
the relevant variables are torque rate of change, rotational speed rate of change and torque rate of change.
Drawings
Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention. Also, like reference numerals are used to refer to like parts throughout the drawings. In the drawings:
FIG. 1 is a flow chart illustrating a method for controlling cylinder deactivation mode switching according to an embodiment of the present invention;
FIG. 2 is a schematic flowchart illustrating a process of determining that the engine is switched from the current mode to the cylinder deactivation mode when the number of cylinder deactivation according to the current mode is zero according to the embodiment of the invention;
FIG. 3 is a schematic flow chart illustrating the process of determining that the engine is switched from the current mode to another mode according to the present invention, where the number of cylinder deactivation in the current mode is not zero and is different from the cylinder deactivation requirement;
FIG. 4 is a schematic flow chart illustrating the process of determining that the engine is switched from the current mode to another mode according to the present invention, where the number of cylinder deactivation in the current mode is not zero and is different from the cylinder deactivation requirement;
FIG. 5 is a schematic flow chart illustrating the process of determining that the engine is switched from the current mode to another mode according to the present invention, where the number of cylinder deactivation in the current mode is not zero and is different from the cylinder deactivation requirement;
fig. 6 is a flowchart illustrating a process of determining whether the number of cylinder deactivation after the engine is switched is updated according to the present mode where the number of cylinder deactivation is zero according to the embodiment of the present invention.
Detailed Description
Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited by the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.
It is to be understood that the terminology used herein is for the purpose of describing particular example embodiments only, and is not intended to be limiting. As used herein, the singular forms "a", "an" and "the" may be intended to include the plural forms as well, unless the context clearly indicates otherwise. The terms "comprises," "comprising," "including," and "having" are inclusive and therefore specify the presence of stated features, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, steps, operations, elements, components, and/or groups thereof.
Although the terms first, second, third, etc. may be used herein to describe various elements, components, regions, layers and/or sections, these elements, components, regions, layers and/or sections should not be limited by these terms. These terms may be only used to distinguish one element, component, region, layer or section from another region, layer or section. Terms such as "first," "second," and other numerical terms when used herein do not imply a sequence or order unless clearly indicated by the context. Thus, a first element, component, region, layer or section discussed below could be termed a second element, component, region, layer or section without departing from the teachings of the example embodiments.
For convenience of description, spatially relative terms, such as "inner", "outer", "lower", "below", "upper", "above", and the like, may be used herein to describe one element or feature's relationship to another element or feature as illustrated in the figures. This spatially relative term is intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as "below" or "beneath" other elements or features would then be oriented "above" or "over" the other elements or features. Thus, the example term "below … …" can include both an up and down orientation. The device may be otherwise oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.
As shown in fig. 1 to 6, a control method of cylinder deactivation mode switching according to an embodiment of the present invention includes:
detecting whether a cylinder breaking requirement exists;
Determining that the engine continues to operate in the current mode according to the absence of the cylinder-breaking requirement;
according to the existence of the cylinder-breaking requirement, determining that the engine is switched from the current mode to another mode for operation;
judging whether the switching moment is a period starting point or not;
and controlling the engine to switch the modes according to the switching moment as a cycle starting point.
According to the control method for switching the cylinder-failure mode, whether the cylinder-failure requirement exists or not is detected, the engine is controlled to operate continuously in the current mode according to the cylinder-failure requirement, the engine is controlled to switch between the normal mode, the cylinder-failure mode and different cylinder-failure modes, the full-mode operation of the engine is achieved, the mode switching is performed at the starting point of the period, the instability of the operation of the engine caused by sudden switching is reduced, the stable output of the engine is improved, the switching time point is controlled, the requirement of the engine can be responded quickly, the switched mode is matched with the operation condition of the engine, and the responsiveness and the stability of the engine can be considered.
In some embodiments of the present invention, when there is a cylinder deactivation requirement, there are three cases that the current mode is a normal mode, it is necessary to switch from the normal mode to a cylinder deactivation mode, the current mode is a cylinder deactivation mode, it is necessary to switch from the cylinder deactivation mode to another cylinder deactivation mode, it is necessary to detect whether the number of cylinder deactivations of the current mode is zero, when the detection result is zero, it indicates that the current mode of the engine is the normal mode, corresponding to a first switching case, when the detection result is not zero, it indicates that the current mode of the engine is the gear deactivation mode, it is necessary to switch to another cylinder deactivation mode or the normal mode, corresponding to a second switching case and a third switching case, and the switching between the normal mode and the cylinder deactivation mode and the switching between different cylinder deactivation modes can be realized through the above logic.
In some embodiments of the present invention, in order to switch from the normal mode to the cylinder deactivation mode in the first switching situation, in the normal mode, the number of cylinders deactivated is zero, and after switching to the cylinder deactivation mode, the number of cylinders deactivated is a demand for cylinder deactivation, so that the number of cylinders deactivated needs to be updated, a new cylinder deactivation rule is called after the update, the engine is controlled to execute according to the new cylinder deactivation rule, and switching is performed at a starting point of a working cycle of the engine, so as to reduce unstable operation caused by sudden switching.
In some embodiments of the present invention, updating the number of broken cylinders is performed after a period of time elapses to achieve improvement of output stability of the engine under severe condition changes, a change rate of a related variable is calculated, wherein the change rate of the related variable includes a rotation speed change rate, a torque change rate, and a torque change rate, but not limited to the above parameters, other variables may be introduced to improve accuracy of the calculation, a maximum value of M sampling points before the change rate of each related variable is counted as a peak value, the number of the sampling points is related to the rotation speed, a relationship between a magnitude of the peak value and a set value is determined, when the peak value is smaller than the set value, a timer starts timing, when a timing duration is greater than the set time value, the number of broken cylinders of the engine is updated to be a demand for broken cylinders, when the peak value is greater than the set value, the timer starts timing after resetting to zero, when the timing duration is greater than the set time value, and updating the cylinder deactivation number of the engine to be the cylinder deactivation requirement.
Before the description of the switching time, the working cycle and the working cycle are described, the working cycle is formed by that all cylinders of the engine complete one working cycle, the cylinder-failure working cycle is formed by a plurality of working cycles of the engine, and taking a six-cylinder engine as an example, the working cycle comprises three working cycles which are 1-5-3-6-2-4-1-5-3-6-2-4.
In some embodiments of the present invention, when the engine is switched from the cylinder deactivation mode to another mode, an appropriate switching time is selected according to a current working condition change level of the engine, and the operating working condition of the engine is determined by using a pilot scale, and before the switching, a nearby working condition change level is required to be calculated, the working condition change level is related to a rotation speed, a torque change rate and a torque change rate of the engine, and can be obtained by looking up a table, when the engine is operated at a low speed, the working condition change level is low, when the engine is operated at a high speed, the working condition change level is high, for the second switching condition, the cylinder deactivation mode is switched to another cylinder deactivation mode, the switching time of the modes is determined according to the working condition change level of the engine, and the first preset value and the second preset value are used as division standards for different switching times, when the working condition change level of the engine is less than the first preset value, determining that the mode switching time of the engine is the current working period, updating the cylinder failure number in the other cylinder failure mode to meet the cylinder failure requirement, calling a corresponding cylinder failure rule, verifying the switching time again, switching the mode at the starting point of the period, determining that the mode switching time of the engine is the current working period when the working condition change level of the engine does not meet a first preset value and meets a second preset value, updating the cylinder failure number in the other cylinder failure mode to meet the cylinder failure requirement, calling the corresponding cylinder failure rule, verifying the switching time again, switching the mode at the starting point of the period, wherein the switching time of the engine is different and is related to the current requirement responsiveness priority or the stability priority of the engine, and when the switching time is the working period, the requirement priority of the engine for the stability is higher than the requirement priority for the responsiveness, when the switching time is the end of the work cycle, the requirement priority of the engine on the responsiveness is higher than the requirement priority of the engine on the stability, and the requirements of the engine on the responsiveness and the stability can be met by selecting the switching time.
In some embodiments of the present invention, in order to address the third switching situation, the cylinder-cut mode is switched to the normal mode, the operating condition change level of the engine does not satisfy the first preset value nor the second preset value, it is required to determine whether the cylinder-cut requirement is greater than the current cylinder-cut number of the engine, when the cylinder-cut requirement is greater than the current cylinder-cut number, the engine continues to operate in the current mode, and the cylinder-cut number is not changed and is not updated, and when the cylinder-cut requirement is not greater than the current cylinder-cut number of the engine, the cylinder-cut number of the engine is forced to be zero, and the cylinder-cut number is not updated, so that the engine is switched to the normal mode, and the process of switching the cylinder-cut mode to the normal mode is completed.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.
Claims (7)
1. A control method for switching between cylinder deactivation modes is characterized by comprising the following steps:
Detecting whether a cylinder breaking requirement exists;
determining that the engine continues to operate in the current mode according to the condition that the cylinder breaking requirement does not exist;
according to the cylinder deactivation requirement, determining that the engine is switched to operate in another mode from a current mode;
judging whether the switching moment is a period starting point or not;
controlling the engine to switch modes according to the switching moment as a cycle starting point;
before the controlling the engine to be switched from a current mode to another mode to operate according to the existence of the cylinder deactivation requirement, the method further comprises the following steps:
detecting whether the cylinder failure number of the current mode is zero or not;
the determining that the engine is switched from the current mode to another mode of operation according to the existence of the cylinder deactivation requirement comprises:
determining that the engine is switched from the current mode to the cylinder deactivation mode according to the fact that the cylinder deactivation number of the current mode is zero;
determining that the engine is switched from the current mode to another mode according to the fact that the cylinder failure number of the current mode is not zero and is different from the cylinder failure requirement;
the determining that the engine is switched from the current mode to the cylinder deactivation mode when the number of cylinder deactivation according to the current mode is zero comprises:
determining whether the switched cylinder failure number of the engine is updated or not according to the fact that the cylinder failure number of the current mode is zero;
Updating according to the cylinder failure number after the mode of the engine is switched, and determining the cylinder failure number of the cylinder failure mode as the cylinder failure requirement;
the determining whether the number of cylinder deactivation after the engine switching is updated according to the fact that the number of cylinder deactivation according to the current mode is zero comprises:
calculating the change rate of the relevant variable;
calculating a peak value of the correlation change rate;
starting timing according to the fact that the peak value is smaller than a set value;
determining that a timer is reset and starts timing according to the fact that the peak value is larger than a set value;
and determining the number of cylinder breaks after the engine is switched to update according to the fact that the timing duration is greater than a time set value.
2. The method of claim 1, wherein before determining that the engine is switched from the current mode to another mode when the number of cylinder deactivation according to the current mode is not zero and is different from the cylinder deactivation demand, further comprising: calculating the working condition change grade of the engine;
the determining that the engine is switched from the current mode to the other mode according to the fact that the number of cylinder deactivation of the current mode is not zero and the number of cylinder deactivation is different from the cylinder deactivation requirement comprises:
determining whether the working condition change grade of the engine meets a first preset value or not according to the fact that the cylinder failure number of the current mode is not zero and is smaller than the cylinder failure requirement;
Determining the mode switching moment of the engine according to the condition change grade of the engine meeting the first preset value;
and determining the cylinder failure number of the other cylinder failure mode as the cylinder failure requirement.
3. The method for controlling switching of the cylinder deactivation mode according to claim 2, wherein the determining that the engine is switched from the current mode to another mode according to the fact that the number of cylinder deactivations of the current mode is not zero and the number of cylinder deactivations is different from the cylinder deactivation requirement further comprises:
determining whether the working condition change grade of the engine meets a second preset value or not according to the fact that the number of broken cylinders in the current mode is not zero and is smaller than the cylinder breaking requirement;
determining the mode switching moment of the engine according to the condition change grade of the engine meeting the second preset value;
and determining the cylinder failure number of the other cylinder failure mode as the cylinder failure requirement.
4. The method for controlling switching of the cylinder deactivation mode according to claim 3, wherein the determining that the engine is switched from the current mode to another mode according to the fact that the number of cylinder deactivations of the current mode is not zero and the number of cylinder deactivations is different from the cylinder deactivation requirement further comprises:
determining whether the cylinder breaking requirement is larger than the current cylinder breaking number of the engine according to the condition change grade of the engine not meeting the first preset value and the second preset value;
Determining that the engine continues to operate in the current mode according to the fact that the cylinder breaking requirement is larger than the current cylinder breaking number of the engine;
and determining that the engine is switched to a normal mode to operate according to the condition that the cylinder breaking requirement is not larger than the current cylinder breaking number of the engine.
5. The control method of the cylinder deactivation mode switching according to claim 2,
and determining the mode switching time of the engine when the working condition change grade of the engine meets a first preset value, wherein the mode switching time is after the current working period of the engine is finished.
6. The control method of the cylinder deactivation mode switching according to claim 3,
and determining the mode switching time of the engine when the working condition change grade of the engine meets a second preset value, wherein the mode switching time is after the current working cycle of the engine is finished.
7. The control method of the cylinder deactivation mode switching according to claim 6, wherein in said calculating the rate of change of the correlation variable and the peak value of the correlation rate of change:
the relevant variables are torque change rate, rotation speed change rate and torque change rate.
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| CN101408135A (en) * | 2008-11-18 | 2009-04-15 | 上海汽车集团股份有限公司 | Accidental control policy of multi-cylinder engine part air cylinder stopping |
| DE102011122528B4 (en) * | 2011-12-27 | 2016-09-08 | Audi Ag | Method for operating an internal combustion engine of a motor vehicle and corresponding internal combustion engine |
| CN107542583B (en) * | 2016-06-28 | 2019-12-06 | 长城汽车股份有限公司 | Control device and method for engine cylinder-failure mode |
| CN109641587B (en) * | 2016-08-25 | 2021-12-10 | 图拉技术公司 | Engine torque smoothing |
| CN110259586A (en) * | 2019-06-28 | 2019-09-20 | 一汽解放汽车有限公司 | A kind of diesel engine cylinder deactivation gas path control method |
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