CN111997764A - Cylinder-breaking control method and system based on non-road engine - Google Patents
Cylinder-breaking control method and system based on non-road engine Download PDFInfo
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- CN111997764A CN111997764A CN202010835597.7A CN202010835597A CN111997764A CN 111997764 A CN111997764 A CN 111997764A CN 202010835597 A CN202010835597 A CN 202010835597A CN 111997764 A CN111997764 A CN 111997764A
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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
- 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
- F02D41/22—Safety or indicating devices for abnormal 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
- F02D2700/00—Mechanical control of speed or power of a single cylinder piston engine
- F02D2700/05—Controlling by preventing combustion in one or more cylinders
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/40—Engine management systems
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Abstract
The invention relates to the technical field of diesel engine electric control systems, and particularly discloses a cylinder-breaking control method based on a non-road engine, wherein the cylinder-breaking control method comprises the following steps: calculating the cylinder-breaking requirement of the engine to obtain the cylinder-breaking requirement result of the engine; performing allowed cylinder-breaking control on the engine according to the engine cylinder-breaking requirement result and by combining with the engine operation parameters to obtain allowed cylinder-breaking control parameters; and calculating and outputting the cylinder-breaking flag bit of each cylinder of the engine according to the allowable cylinder-breaking control parameters. The invention also discloses a cylinder-breaking control system based on the non-road engine. The cylinder-failure control method based on the non-road engine can select different oil quantity processing modes according to the transient judgment result of the cylinder-failure stability of the engine, realize the flexible transition of the cylinder-failure and the full cylinder of the engine in different states, and improve the running stability of the engine.
Description
Technical Field
The invention relates to the technical field of diesel engine electric control systems, in particular to a cylinder-breaking control method based on a non-road engine and a cylinder-breaking control system based on the non-road engine.
Background
In the prior art, the engine cylinder-off control is realized through an ECU and a mechanical device, and the engine cylinder-off control has complex functions and higher cost. In addition, the working cylinder and the stopping cylinder of the cylinder-breaking technology are fixed or the states are not distinguished, so that the working nonuniformity among the cylinders and the unstable running of the engine are easily caused, and the reliability of the engine is influenced. In the prior art, a cylinder-failure control strategy aiming at a non-road diesel engine does not exist. Therefore, how to provide a cylinder deactivation control method for an off-road diesel engine is a technical problem to be solved urgently by those skilled in the art.
Disclosure of Invention
The invention provides a cylinder-breaking control method based on a non-road engine and a cylinder-breaking control system based on the non-road engine, and solves the problem that a cylinder-breaking control mode aiming at a non-road diesel engine is lacked in the related technology.
As a first aspect of the present invention, there is provided a method for controlling cylinder deactivation based on an off-road engine, comprising:
calculating the cylinder-breaking requirement of the engine to obtain the cylinder-breaking requirement result of the engine;
performing allowed cylinder-breaking control on the engine according to the engine cylinder-breaking requirement result and by combining with the engine operation parameters to obtain allowed cylinder-breaking control parameters;
and calculating and outputting the cylinder-breaking flag bit of each cylinder of the engine according to the allowable cylinder-breaking control parameters.
Further, the calculating the engine cylinder deactivation requirement to obtain an engine cylinder deactivation requirement result includes:
and selecting an engine cylinder-off operation mode according to the engine cylinder-off communication energy and ECU cylinder-off control enabling, and judging the cylinder-off requirement according to the engine operation related parameters to obtain the engine cylinder-off requirement result.
Further, the selecting an engine cylinder-off operation mode according to the engine cylinder-off communication enable and the ECU cylinder-off control enable, and judging the cylinder-off requirement according to the engine operation related parameters to obtain the engine cylinder-off requirement result, includes:
when the engine cylinder-off communication enable signal state is 1, receiving a control signal for controlling the engine cylinder-off through an OBD diagnostic instrument and intelligent diagnostic software, and setting the state of an engine cylinder-off demand flag bit to be 1;
and when the engine cylinder-off communication enabling signal state is 0, selecting a cylinder-off control mode according to the ECU cylinder-off enabling signal state.
Further, when the engine cylinder deactivation communication enabling signal state is 0, selecting a cylinder deactivation control mode according to the ECU cylinder deactivation enabling signal state, comprising:
when the ECU cylinder-breaking enabling signal state is 0, determining that the engine does not enter a cylinder-breaking control state, and setting the state of a cylinder-breaking demand flag bit of the engine to be 0;
when the ECU cylinder-breaking enable signal state is 1, controlling the engine to enter automatic cylinder-breaking control, and obtaining the state of the corresponding engine cylinder-breaking demand flag bit according to the working condition of the engine;
and when the ECU cylinder-breaking enabling signal state is 2, determining that the engine enters a manual cylinder-breaking control state, and setting the state of an engine cylinder-breaking demand flag bit to be 1.
Further, when the ECU cylinder deactivation enable signal state is 1, the engine is controlled to enter the automatic cylinder deactivation control, and the state of the corresponding engine cylinder deactivation demand flag bit is obtained according to the engine working condition, including:
when the engine is in a stop or start working condition, setting the state of an engine cylinder-failure requirement flag bit to be 0;
when the engine is in the AfterRun working condition, setting the state of the current moment of the engine cylinder-failure demand zone bit to be equal to the state of the previous moment;
and when the engine is in the operating condition, calculating the state of the engine cylinder-breaking demand flag bit according to the state of the engine cylinder-breaking demand temporary flag bit.
Further, the step of performing the allowable engine deactivation control of the engine according to the engine deactivation demand result and in combination with the engine operation parameters to obtain allowable engine deactivation control parameters includes:
calculating the current crank angle of the engine according to the rotating speed of the engine, the crankshaft, the cam phase and the ignition top dead center;
and calculating the allowed cylinder-breaking flag bit of the engine according to the cylinder-breaking requirement flag bit of the engine, the ECU cylinder-breaking enabling signal and the crank angle of the engine.
Further, the calculating the engine allowed cylinder deactivation flag according to the state of the engine cylinder deactivation demand flag, the state of the ECU cylinder deactivation enable signal and the engine crank angle includes:
when the state of the engine cylinder-breaking demand flag bit is 1 and the state of an ECU cylinder-breaking enable signal is 1, obtaining the corresponding state of the allowable cylinder-breaking flag bit according to the difference of the crank angles of the engine;
and calculating the cylinder-breaking stable transient marker according to the state of the engine cylinder-breaking demand marker and the state of the allowable cylinder-breaking marker.
Further, the calculating and outputting the cylinder-cut flag bit of each cylinder of the engine according to the allowable cylinder-cut control parameter includes:
when the engine cylinder-off communication enabling signal state is 1, performing engine cylinder-off control according to the engine cylinder-off control state communication value, and setting the cylinder-off state corresponding to the engine communication cylinder-off number as 1;
and when the engine cylinder-off communication enabling signal state is 0, outputting the corresponding cylinder-off state of the engine cylinder-off number according to different cylinder-off control enabling signal states of the ECU.
Further, when the engine cylinder deactivation communication enable signal state is 0, the corresponding cylinder deactivation state of the engine cylinder deactivation cylinder number is output according to the difference of the ECU cylinder deactivation control enable signal states, and the method comprises the following steps:
when the ECU cylinder-breaking control enabling signal state is 2, performing cylinder-breaking control according to the manual cylinder-breaking curve of the engine, and setting the cylinder-breaking state of the corresponding engine cylinder-breaking number as 1;
when the ECU cylinder-breaking control enabling signal state is 1, the state of the engine cylinder-breaking demand flag bit is 1 and the state of the cylinder-breaking permission flag bit is 1, respectively calculating the cylinder-breaking state corresponding to the engine cylinder-breaking number according to the cylinder-breaking stability transient state.
As another aspect of the present invention, there is provided an off-road engine based cylinder deactivation control system, comprising:
the engine cylinder-breaking demand calculation module is used for calculating the engine cylinder-breaking demand to obtain an engine cylinder-breaking demand result;
the engine allowed cylinder-breaking control module is used for controlling the allowed cylinder-breaking of the engine according to the engine cylinder-breaking requirement result and by combining with the engine operation parameters to obtain allowed cylinder-breaking control parameters;
and the cylinder-breaking control output calculation module is used for calculating and outputting the cylinder-breaking zone bit of each cylinder of the engine according to the allowable cylinder-breaking control parameters.
According to the off-cylinder control method based on the non-road engine, the off-cylinder requirement calculation is carried out according to the working state of the engine, the off-cylinder calculation and the off-cylinder output calculation are allowed to realize the accurate off-cylinder control, the software resources can be effectively saved, the control precision is improved, different oil quantity processing modes can be selected according to the transient judgment result of the off-cylinder stability of the engine, the flexible transition of the off-cylinder and the full-cylinder of the engine under different states is realized, and the running stability of the engine is improved.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention.
FIG. 1 is a flow chart of a method for off-road engine based control of cylinder deactivation according to the present invention.
FIG. 2 is a flow chart of the implementation of the cylinder deactivation control function provided by the present invention.
FIG. 3 is a schematic diagram of the cylinder deactivation transient control provided by the present invention.
FIG. 4 is a block diagram of a cylinder deactivation control system for an off-road engine according to the present invention.
Fig. 5 is a schematic diagram of a cylinder deactivation control curve provided by the present invention.
Detailed Description
It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict. The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.
In order to make those skilled in the art better understand the technical solution of the present invention, the technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that the terms "first," "second," and the like in the description and claims of the present invention and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged under appropriate circumstances in order to facilitate the description of the embodiments of the invention herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
In the present embodiment, a method for controlling off-road engine based cylinder deactivation is provided, and fig. 1 is a flowchart of a method for controlling off-road engine based cylinder deactivation according to an embodiment of the present invention, as shown in fig. 1, including:
s110, calculating the cylinder-breaking requirement of the engine to obtain the cylinder-breaking requirement result of the engine;
s120, performing allowed cylinder-breaking control on the engine according to the engine cylinder-breaking requirement result and by combining engine operation parameters to obtain allowed cylinder-breaking control parameters;
and S130, calculating and outputting the cylinder-breaking zone bit of each cylinder of the engine according to the allowable cylinder-breaking control parameters.
According to the off-cylinder control method based on the non-road engine provided by the embodiment of the invention, the off-cylinder demand calculation, the allowed off-cylinder calculation and the off-cylinder output calculation are carried out according to the working state of the engine to realize the accurate off-cylinder control, software resources can be effectively saved, the control precision is improved, different oil quantity processing modes can be selected according to the transient judgment result of the off-cylinder stability of the engine, the flexible transition between the off-cylinder and the full cylinder of the engine in different states is realized, and the running stability of the engine is improved.
Specifically, the calculating of the engine cylinder deactivation requirement to obtain an engine cylinder deactivation requirement result includes:
and selecting an engine cylinder-off operation mode according to the engine cylinder-off communication energy and ECU cylinder-off control enabling, and judging the cylinder-off requirement according to the engine operation related parameters to obtain the engine cylinder-off requirement result.
Further specifically, the selecting an engine cylinder-off operation mode according to the engine cylinder-off communication enable and the ECU cylinder-off control enable, and performing the cylinder-off requirement judgment according to the engine operation related parameters to obtain the engine cylinder-off requirement result includes:
when the engine cylinder-off communication enable signal state is 1, receiving a control signal for controlling the engine cylinder-off through an OBD diagnostic instrument and intelligent diagnostic software, and setting the state of an engine cylinder-off demand flag bit to be 1;
and when the engine cylinder-off communication enabling signal state is 0, selecting a cylinder-off control mode according to the ECU cylinder-off enabling signal state.
Specifically, when the engine cylinder deactivation communication enabling signal state is 0, selecting a cylinder deactivation control mode according to the ECU cylinder deactivation enabling signal state includes:
when the ECU cylinder-breaking enabling signal state is 0, determining that the engine does not enter a cylinder-breaking control state, and setting the state of a cylinder-breaking demand flag bit of the engine to be 0;
when the ECU cylinder-breaking enable signal state is 1, controlling the engine to enter automatic cylinder-breaking control, and obtaining the state of the corresponding engine cylinder-breaking demand flag bit according to the working condition of the engine;
and when the ECU cylinder-breaking enabling signal state is 2, determining that the engine enters a manual cylinder-breaking control state, and setting the state of an engine cylinder-breaking demand flag bit to be 1.
Specifically, when the ECU cylinder deactivation enable signal state is 1, then control the engine to enter automatic cylinder deactivation control, and obtain the state of the corresponding engine cylinder deactivation demand flag bit according to the engine operating condition, including:
when the engine is in a stop or start working condition, setting the state of an engine cylinder-failure requirement flag bit to be 0;
when the engine is in the AfterRun working condition, setting the state of the current moment of the engine cylinder-failure demand zone bit to be equal to the state of the previous moment;
and when the engine is in the operating condition, calculating the state of the engine cylinder-breaking demand flag bit according to the state of the engine cylinder-breaking demand temporary flag bit.
When the engine is in an operating condition, the engine cylinder deactivation demand flag is calculated by installing the following modes:
when the engine cylinder deactivation demand temporary flag position 0:
if the actual fuel injection quantity is less than the threshold value of the cylinder-off oil quantity of the engine (a two-dimensional curve value is searched, the temperature of X-coolant and the temperature of Y-oil quantity), the cylinder-off judgment time of the engine starts to be accumulated;
further, when the actual fuel injection quantity is equal to the engine cylinder-failure fuel quantity threshold value and the cylinder-failure coefficient, resetting the engine cylinder-failure judgment time; when the engine is not in the operating condition, resetting the engine cylinder-failure judgment time; when the judgment time of the engine cylinder failure > is the engine cylinder failure operation shake elimination time, the position of the engine cylinder failure requirement mark is 1, and the judgment time of the engine cylinder failure is cleared
When the engine cylinder deactivation demand temporarily marks position 1:
and if the actual fuel injection quantity > is equal to the threshold value of the fuel quantity of the engine in cylinder failure and the coefficient of cylinder failure, the temporary demand mark position of the engine in cylinder failure is 0.
The engine cylinder-breaking demand zone bit is obtained by assigning a value to the engine cylinder-breaking temporary demand zone bit after the demand confirmation time.
Specifically, the step of performing the allowable engine deactivation control of the engine according to the engine deactivation demand result and in combination with the engine operation parameters to obtain allowable engine deactivation control parameters includes:
calculating the current crank angle of the engine according to the rotating speed of the engine, the crankshaft, the cam phase and the ignition top dead center;
and calculating the allowed cylinder-breaking flag bit of the engine according to the cylinder-breaking requirement flag bit of the engine, the ECU cylinder-breaking enabling signal and the crank angle of the engine.
Specifically, the calculating of the engine allowed cylinder deactivation flag according to the state of the engine cylinder deactivation demand flag, the state of the ECU cylinder deactivation enable signal and the engine crank angle includes:
when the state of the engine cylinder-breaking demand flag bit is 1 and the state of an ECU cylinder-breaking enable signal is 1, obtaining the corresponding state of the allowable cylinder-breaking flag bit according to the difference of the crank angles of the engine;
and calculating the cylinder-breaking stable transient marker according to the state of the engine cylinder-breaking demand marker and the state of the allowable cylinder-breaking marker.
It should be understood that the engine allowed cylinder-cut control module obtains the engine allowed cylinder-cut control module according to the engine speed, the engine ignition curve, the crank angle and the cylinder-cut demand flag bit, and adopts different oil mass filter coefficients and step length limitation through the transient judgment of the cylinder-cut stability, so as to improve the stability of the engine operation:
1. calculating the current engine crankshaft rotation angle CA (CA is more than or equal to 0 degrees and less than 720 degrees) according to the engine rotation speed, the crankshaft and cam phase and the ignition top dead center;
2. when the engine is in the cylinder-off demand mark position 1 and the cylinder-off enable is set to 1:
1) when the crank angle of the engine is 0 degrees, allowing the cylinder-off mark position 1;
2) and when the engine crank angle is not equal to 0 degrees, the cylinder deactivation allowed flag bit is equal to 0 degrees, the engine crank angle is continuously recorded, and when the engine crank angle is equal to 0 degrees, the cylinder deactivation allowed flag bit is equal to 1 degrees, and the cylinder deactivation control is allowed.
3. When the engine cylinder deactivation demand flag position is 0, the permissible cylinder deactivation flag bit is 0.
When the cylinder-breaking demand flag bit changes (there is cylinder-breaking and full-cylinder work switching), the cylinder-breaking steady transient flag position 1, and when the cylinder-breaking demand flag bit and the cylinder-breaking permission flag bit do not change (full-cylinder work or cylinder-breaking work), the cylinder-breaking steady transient flag position 0.
Specifically, the calculating and outputting the cylinder-cut flag bit of each cylinder of the engine according to the allowable cylinder-cut control parameter comprises:
when the engine cylinder-off communication enabling signal state is 1, performing engine cylinder-off control according to the engine cylinder-off control state communication value, and setting the cylinder-off state corresponding to the engine communication cylinder-off number as 1;
and when the engine cylinder-off communication enabling signal state is 0, outputting the corresponding cylinder-off state of the engine cylinder-off number according to different cylinder-off control enabling signal states of the ECU.
Further specifically, when the enable signal state of the engine cylinder deactivation communication is 0, the method outputs the cylinder deactivation state of the corresponding engine cylinder deactivation cylinder number according to the difference of the ECU cylinder deactivation control enable signal states, and includes:
when the ECU cylinder-breaking control enabling signal state is 2, performing cylinder-breaking control according to the manual cylinder-breaking curve of the engine, and setting the cylinder-breaking state of the corresponding engine cylinder-breaking number as 1;
when the ECU cylinder-breaking control enabling signal state is 1, the state of the engine cylinder-breaking demand flag bit is 1 and the state of the cylinder-breaking permission flag bit is 1, respectively calculating the cylinder-breaking state corresponding to the engine cylinder-breaking number according to the cylinder-breaking stability transient state.
Obtaining the cylinder-breaking flag bit and the pulse width of each cylinder in an engine cylinder-breaking control output calculation module:
1. when the cylinder-off communication control enable is 1, performing engine cylinder-off control according to the engine cylinder-off control state communication value, wherein the cylinder-off state corresponding to the engine communication cylinder-off number is 1;
2. when the cylinder-off communication control is enabled to be 0:
1) and when the cylinder-breaking control enable is 2, performing cylinder-breaking control according to the manual cylinder-breaking curve of the engine, wherein the cylinder-breaking state corresponding to the cylinder-breaking number of the engine is 1.,
2) when the cylinder-cut control enables to be 1, the cylinder-cut demand mark position 1 and the cylinder-cut permission mark position 1, then:
firstly, outputting a cylinder-cutoff stable transient mark position 1, outputting a cylinder-cutoff operation state 1, and selecting a cylinder-cutoff operation curve 1 to perform cylinder-cutoff control, wherein the engine oil quantity is obtained by performing cylinder-cutoff transient filtering on actual oil quantity, and the cylinder-cutoff is accumulated circularly;
secondly, after the cylinder-off work switching cycle judgment, outputting a cylinder-off operating state 2, selecting a cylinder-off operating curve 2 to perform cylinder-off control, and resetting the cylinder-off cycle. The engine oil quantity is obtained by performing cylinder-breaking steady-state filtering on actual oil quantity, and performing cylinder-breaking cyclic accumulation;
and thirdly, outputting a cylinder-cut operation state 1 after the cylinder-cut operation switching cycle judgment, selecting a cylinder-cut operation curve 1 to perform cylinder-cut control, and resetting the cylinder-cut cycle. The engine oil quantity is obtained by performing cylinder-breaking steady-state filtering on actual oil quantity, and performing cylinder-breaking cyclic accumulation;
fourthly, the engine oil is less than the threshold value of the cylinder-breaking oil quantity of the engine and the cylinder-breaking coefficient, and the engine performs the steady-state control of the cylinder breaking (repeatedly the second step and the third step);
and fifthly, until the engine oil quantity is more than or equal to the engine cylinder-failure oil quantity threshold value and the cylinder-failure coefficient: if the cylinder-off running state is 1, the engine enters a cylinder-off running state 2 when the next crankshaft rotation angle is equal to 0 degrees; if the engine is in the cylinder-off operation state 2 at the moment, the judgment of the crank angle is not needed;
and sixthly, in the cylinder-cut operation state 2, the engine oil quantity is more than or equal to the threshold value of the engine cylinder-cut oil quantity, namely the cylinder-cut coefficient, when the rotation angle of the engine crankshaft is 0 degrees, the cylinder-cut demand flag bit is 0, the cylinder-cut demand flag bit is changed, the cylinder-cut stability transient flag bit is 1, and the engine oil quantity is obtained through transient filtering, so that the flexible switching of the cylinder-cut operation of the engine is realized. And the cylinder-breaking state corresponding to the cylinder-breaking number of the engine according to the cylinder-breaking operation curve is 1. The engine enters a full-cylinder running state, a cylinder-breaking requirement mark position 0, a cylinder-breaking stable transient mark position 0, a cylinder-breaking running state 1 and a cylinder-breaking running period zero clearing (cylinder-breaking running data initialization).
The following describes in detail a specific implementation process of the off-road engine based control method according to the embodiment of the present invention with reference to fig. 2 and 3.
Step S301: when the cylinder-off communication enabling switch is turned off, selecting a cylinder-off control mode through the ECU cylinder-off control selection switch;
step S302: the ECU cylinder-breaking control selection switch is set to a middle gear, and ECU automatic cylinder-breaking control is carried out;
step S303: in the ECU automatic cylinder-breaking control, a crankshaft sensor signal is collected, the ECU processes and outputs a rotating speed signal, the running state of an engine is judged, and under the running working condition, the ECU collects the oil injection quantity and the temperature of cooling liquid to calculate the cylinder-breaking requirement;
step S304: when the actual oil amount is less than an oil amount threshold obtained by looking up a table according to the cooling liquid, temporarily marking the position 1 by the cylinder-breaking demand, accumulating the cylinder-breaking demand shake-eliminating time, and marking the position 1 by the cylinder-breaking demand after the cylinder-breaking demand shake-eliminating time is greater than the cylinder-breaking demand shake-eliminating time threshold; and if the oil quantity is greater than the oil quantity threshold in the accumulation process of the cylinder-breaking-demand shake-elimination time, resetting the cylinder-breaking-demand shake-elimination time.
Step S305: the cylinder-breaking requirement mark position 1 is marked, the rotation angle of a crankshaft of the engine is 0 degree, and the cylinder-breaking requirement mark position 1 is allowed;
step S306: allowing a cylinder-breaking mark position 1, setting a cylinder-breaking demand mark position from 0 to 1, setting a cylinder-breaking stable transient mark position 1, selecting a cylinder-breaking operation control curve 1 by the ECU, performing cylinder-breaking control, and setting a cylinder-breaking operation state 1, wherein the oil quantity of the engine is obtained by the actual oil quantity at the last moment through a cylinder-breaking transient filter coefficient;
step S307: the engine oil amount is less than an oil amount threshold obtained by looking up a table according to cooling liquid, a cylinder-breaking demand marker bit and a cylinder-breaking permission marker bit are both 1, and a cylinder-breaking operation control marker bit is 1;
step S308: the engine enters automatic cylinder-breaking control calculation:
recording a cylinder-breaking operation period (the engine crankshaft angle is changed from 0 degree to 720 degrees to form a period), clearing the cylinder-breaking operation period after the cylinder-breaking operation period is changed, simultaneously selecting a cylinder-breaking operation control curve 2 by an ECU, setting a cylinder-breaking operation state 2, not changing a cylinder-breaking demand flag bit, obtaining the engine oil quantity through a cylinder-breaking steady-state filter coefficient, and accumulating the cylinder-breaking operation period;
after the cylinder-off operation period is equal to the cylinder-changing period, resetting the cylinder-off operation period, simultaneously selecting a cylinder-off operation control curve 1 by the ECU, setting the cylinder-off operation state to be 1, ensuring that the cylinder-off demand flag bit is not changed, obtaining the engine oil quantity through a cylinder-off steady-state filter coefficient, and accumulating the cylinder-off operation period;
step S309: the engine torque is increased, the coolant temperature is increased, the actual oil quantity is increased, the oil quantity threshold obtained by looking up the table according to the coolant is reduced until the oil quantity of the engine is more than or equal to the oil quantity threshold obtained by looking up the table according to the coolant, and the engine cylinder-breaking operation cycle is cleared. Under the condition that the next crankshaft rotation angle is equal to 0 degrees, the engine enters a cylinder-cut-off running state 2, the cylinder-cut-off is stabilized at a transient mark position 1, meanwhile, a cylinder-cut-off demand mark position is set from 1 to 0, the oil quantity of the engine is obtained through a cylinder-cut-off transient filter coefficient, and the engine exits a cylinder-cut-off control state;
step S310: the engine enters a full-cylinder running state, a cylinder-breaking requirement mark position 0, a cylinder-breaking stable transient mark position 0, a cylinder-breaking running state 1 and a cylinder-breaking running period zero clearing (cylinder-breaking running data initialization).
In summary, according to the cylinder-failure control method based on the non-road engine provided by the embodiment of the invention, different oil quantity processing modes are selected according to the transient judgment result of the cylinder-failure stability of the engine, the flexible transition between the cylinder-failure and the full cylinder of the engine in different states is realized, and the running stability of the engine is improved; as shown in fig. 5, a cylinder deactivation control curve, which is exemplified by a 12-cylinder engine, may actually cover a plurality of multi-cylinder engines, and of course, the engine enters the cylinder deactivation operation from the cylinder deactivation control curve 1 and exits the cylinder deactivation operation from the cylinder deactivation control curve 2 through calculation and fixation of the crank angle, so as to realize stability and smoothness of the engine operation, as well as the curve shown in fig. 5.
In addition, according to the off-cylinder control method based on the non-road engine provided by the embodiment of the invention, the variation of the off-cylinder demand flag bit and the off-cylinder allowable flag bit of the engine is judged to perform the off-cylinder stability transient judgment so as to adopt different oil quantity filter coefficients, thereby ensuring the stability of the engine in the switching processes of off-cylinder, namely full-cylinder switching, off-cylinder state 1, off-cylinder state 2; by judging the crank angle of the engine, when the crank angle is 0 degrees, the engine is allowed to perform cylinder-off-full-cylinder operation switching, and the switching between the cylinder-off state 1 and the cylinder-off state 2 takes the engine operation period as a judgment condition instead of time, so that the operation stability of the engine is ensured, and the mechanical impact is reduced; the cylinder-off-full cylinder switching is carried out, and the engine enters the cylinder-off operation from the full cylinder under the condition that the crank angle of the engine is 0 degrees, and the cylinder-off operation is controlled by a cylinder-off curve 1; the engine cylinder-off entering full-cylinder operation is that the engine cylinder-off curve 2 exits to the full-cylinder operation under the condition that the crank angle of the engine is 0 degrees. Therefore, continuous ignition of the same cylinder in the switching process can be effectively avoided, and impact on the engine and the EUC is reduced.
As another embodiment of the present invention, there is provided a cylinder deactivation control system based on an off-road engine, as shown in fig. 4, including:
the engine cylinder-failure demand calculating module 101 is used for calculating the engine cylinder-failure demand to obtain an engine cylinder-failure demand result;
the engine allowed cylinder-breaking control module 102 is used for performing engine allowed cylinder-breaking control according to the engine cylinder-breaking requirement result and by combining with the engine operation parameters to obtain allowed cylinder-breaking control parameters;
and the cylinder-breaking control output calculation module 103 is used for calculating and outputting the cylinder-breaking zone bit of each cylinder of the engine according to the allowable cylinder-breaking control parameters.
The cylinder-breaking control system based on the non-road engine comprises an engine cylinder-breaking requirement calculation module, an engine cylinder-breaking permission control module and a cylinder-breaking control output calculation module, wherein the engine cylinder-breaking permission control module is used for realizing flexible transition of the oil quantity of the engine and improving the running stability of the engine through transient judgment of cylinder-breaking stability.
It should be noted that, for a specific implementation of the off-road engine based cylinder deactivation control system provided in the embodiment of the present invention, reference may be made to the foregoing description of the off-road engine based cylinder deactivation control method, and details are not described herein again.
It will be understood that the above embodiments are merely exemplary embodiments taken to illustrate the principles of the present invention, which is not limited thereto. It will be apparent to those skilled in the art that various modifications and improvements can be made without departing from the spirit and substance of the invention, and these modifications and improvements are also considered to be within the scope of the invention.
Claims (10)
1. A cylinder deactivation control method based on an off-road engine is characterized by comprising the following steps:
calculating the cylinder-breaking requirement of the engine to obtain the cylinder-breaking requirement result of the engine;
performing allowed cylinder-breaking control on the engine according to the engine cylinder-breaking requirement result and by combining with the engine operation parameters to obtain allowed cylinder-breaking control parameters;
and calculating and outputting the cylinder-breaking flag bit of each cylinder of the engine according to the allowable cylinder-breaking control parameters.
2. The off-road engine based control method of claim 1, wherein calculating an engine cylinder deactivation demand results in an engine cylinder deactivation demand result comprising:
and selecting an engine cylinder-off operation mode according to the engine cylinder-off communication energy and ECU cylinder-off control enabling, and judging the cylinder-off requirement according to the engine operation related parameters to obtain the engine cylinder-off requirement result.
3. The off-cylinder control method based on the off-road engine according to claim 2, wherein the selecting of the engine off-cylinder operation mode according to the engine off-cylinder communication enable and the ECU off-cylinder control enable and the determining of the off-cylinder requirement according to the relevant parameters of the engine operation to obtain the result of the engine off-cylinder requirement comprise:
when the engine cylinder-off communication enable signal state is 1, receiving a control signal for controlling the engine cylinder-off through an OBD diagnostic instrument and intelligent diagnostic software, and setting the state of an engine cylinder-off demand flag bit to be 1;
and when the engine cylinder-off communication enabling signal state is 0, selecting a cylinder-off control mode according to the ECU cylinder-off enabling signal state.
4. The off-road engine based control method of claim 3, wherein when the engine cylinder deactivation enabled signal state is 0, selecting the off-cylinder control mode according to the ECU cylinder deactivation enabled signal state comprises:
when the ECU cylinder-breaking enabling signal state is 0, determining that the engine does not enter a cylinder-breaking control state, and setting the state of a cylinder-breaking demand flag bit of the engine to be 0;
when the ECU cylinder-breaking enable signal state is 1, controlling the engine to enter automatic cylinder-breaking control, and obtaining the state of the corresponding engine cylinder-breaking demand flag bit according to the working condition of the engine;
and when the ECU cylinder-breaking enabling signal state is 2, determining that the engine enters a manual cylinder-breaking control state, and setting the state of an engine cylinder-breaking demand flag bit to be 1.
5. The off-road engine-based cylinder deactivation control method according to claim 4, wherein when the ECU cylinder deactivation enabling signal state is 1, controlling the engine to enter automatic cylinder deactivation control, and obtaining the state of the corresponding engine cylinder deactivation demand flag bit according to the engine working condition comprises:
when the engine is in a stop or start working condition, setting the state of an engine cylinder-failure requirement flag bit to be 0;
when the engine is in the AfterRun working condition, setting the state of the current moment of the engine cylinder-failure demand zone bit to be equal to the state of the previous moment;
and when the engine is in the operating condition, calculating the state of the engine cylinder-breaking demand flag bit according to the state of the engine cylinder-breaking demand temporary flag bit.
6. The off-road engine-based cylinder deactivation control method according to claim 4, wherein the step of performing the engine allowed cylinder deactivation control according to the engine cylinder deactivation demand result and in combination with the engine operation parameters to obtain the allowed cylinder deactivation control parameters comprises the following steps:
calculating the current crank angle of the engine according to the rotating speed of the engine, the crankshaft, the cam phase and the ignition top dead center;
and calculating the allowed cylinder-breaking flag bit of the engine according to the cylinder-breaking requirement flag bit of the engine, the ECU cylinder-breaking enabling signal and the crank angle of the engine.
7. The off-road engine based control method of claim 6, wherein the calculating of the engine allowed off-cylinder flag according to the state of the engine off-cylinder demand flag, the state of the ECU off-cylinder enable signal, and the engine crank angle comprises:
when the state of the engine cylinder-breaking demand flag bit is 1 and the state of an ECU cylinder-breaking enable signal is 1, obtaining the corresponding state of the allowable cylinder-breaking flag bit according to the difference of the crank angles of the engine;
and calculating the cylinder-breaking stable transient marker according to the state of the engine cylinder-breaking demand marker and the state of the allowable cylinder-breaking marker.
8. The off-road engine based cylinder deactivation control method according to claim 7, wherein said calculating and outputting a cylinder deactivation flag bit for each cylinder of the engine according to the cylinder deactivation allowable control parameter comprises:
when the engine cylinder-off communication enabling signal state is 1, performing engine cylinder-off control according to the engine cylinder-off control state communication value, and setting the cylinder-off state corresponding to the engine communication cylinder-off number as 1;
and when the engine cylinder-off communication enabling signal state is 0, outputting the corresponding cylinder-off state of the engine cylinder-off number according to different cylinder-off control enabling signal states of the ECU.
9. The off-road engine-based cylinder deactivation control method according to claim 8, wherein outputting a corresponding engine cylinder deactivation cylinder number deactivation state according to a difference in an ECU cylinder deactivation control enable signal state when the engine cylinder deactivation on-enable signal state is 0, comprises:
when the ECU cylinder-breaking control enabling signal state is 2, performing cylinder-breaking control according to the manual cylinder-breaking curve of the engine, and setting the cylinder-breaking state of the corresponding engine cylinder-breaking number as 1;
when the ECU cylinder-breaking control enabling signal state is 1, the state of the engine cylinder-breaking demand flag bit is 1 and the state of the cylinder-breaking permission flag bit is 1, respectively calculating the cylinder-breaking state corresponding to the engine cylinder-breaking number according to the cylinder-breaking stability transient state.
10. A cylinder deactivation control system based on an off-road engine, comprising:
the engine cylinder-breaking demand calculation module is used for calculating the engine cylinder-breaking demand to obtain an engine cylinder-breaking demand result;
the engine allowed cylinder-breaking control module is used for controlling the allowed cylinder-breaking of the engine according to the engine cylinder-breaking requirement result and by combining with the engine operation parameters to obtain allowed cylinder-breaking control parameters;
and the cylinder-breaking control output calculation module is used for calculating and outputting the cylinder-breaking zone bit of each cylinder of the engine according to the allowable cylinder-breaking control parameters.
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