CN115217569B - Phase adjustment method, device and equipment for engine camshaft and engine - Google Patents
Phase adjustment method, device and equipment for engine camshaft and engine Download PDFInfo
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- CN115217569B CN115217569B CN202110974520.2A CN202110974520A CN115217569B CN 115217569 B CN115217569 B CN 115217569B CN 202110974520 A CN202110974520 A CN 202110974520A CN 115217569 B CN115217569 B CN 115217569B
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
- F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
- F01L1/34—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of means for changing the timing of the valves without changing the duration of opening and without affecting the magnitude of the valve lift
- F01L1/344—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of means for changing the timing of the valves without changing the duration of opening and without affecting the magnitude of the valve lift changing the angular relationship between crankshaft and camshaft, e.g. using helicoidal gear
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
- F01L2820/00—Details on specific features characterising valve gear arrangements
- F01L2820/04—Sensors
- F01L2820/041—Camshafts position or phase sensors
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
- F01L2820/00—Details on specific features characterising valve gear arrangements
- F01L2820/04—Sensors
- F01L2820/042—Crankshafts position
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/12—Improving ICE efficiencies
Abstract
The invention discloses a phase adjustment method of an engine camshaft, which comprises the following steps: detecting an operating condition of the engine in response to the engine condition detection operation; when the operation working condition meets a preset specific working condition, calculating the inflation deviation of the engine based on a preset engine inflation model; acquiring an initial position signal of a cam shaft, and correcting the initial position signal according to the inflation deviation; calculating a position difference value between the initial position signal and the corrected initial position signal; the position difference is applied to the VVT control process to adjust the phase of the camshaft. The invention also discloses a phase adjustment device and equipment of the engine camshaft and an engine. By adopting the embodiment of the invention, the phase of the cam shaft can be accurately adjusted in the VVT control process, the problems of oil consumption, emission deterioration, knocking and the like caused by the deterioration of the engine model precision are avoided, and the oil saving effect of the Miller cycle and the engine safety are ensured.
Description
Technical Field
The present invention relates to the field of engine control technologies, and in particular, to a method, an apparatus, and a device for adjusting a phase of an engine camshaft, and an engine.
Background
In recent years, various technologies for engines have been used in order to meet strict fuel consumption and emission regulations. The VVT (Variable Valve Timing, variable valve timing system) technique and the miller cycle technique are widely used in current gasoline engines as effective measures for improving the thermal efficiency of conventional internal combustion engines and improving the cycle fuel consumption and emissions of the entire vehicle. Among them, VVT technology is widely used because of its high cost performance by improving starting performance, idle stability, full load torque, partial load economy, and emissions by affecting charge efficiency, residual exhaust gas, and pumping loss. In addition, the Miller cycle technology adopts a small wrap angle air inlet cam angle to further reduce the throttling effect of small load and reduce the effective compression ratio of medium and large load by closing the air inlet valve in advance, thereby improving the combustion phase, greatly improving the economy and being widely applied due to the outstanding oil-saving effect.
Although the VVT technique can greatly improve the fuel economy of the engine in combination with the Miller cycle technique, the Miller cycle is more sensitive to residual exhaust gas in the cylinder, so that the accuracy requirement on the reference position of the camshaft of the engine is higher. The actual reference position of the cam shaft has a certain deviation from the design value due to the machining error of the signal wheel and the cam shaft, the error of the sensor and the mounting hole, the measurement error of the sensor, the mounting error of the cam shaft and the abrasion. If the deviation cannot be accurately identified and learned and compensated, the phase of the camshaft cannot be accurately regulated in the VVT control process, the physical deviation of the actual reference position of the camshaft can cause the precision deterioration of the inflation and torque model, and the accuracy exceeds the standard range, so that parameters such as an ignition angle and the like are unsuitable, thereby causing the combustion deterioration of the engine, seriously affecting the fuel-saving effect, causing the emission deterioration, serious knocking and even deriving NVH related problems.
Disclosure of Invention
The embodiment of the invention aims to provide a position adjustment method, device and equipment for an engine camshaft and an engine, which take actual phase assembly deviation and signal error into consideration to carry out compensation calculation, so that the phase of the camshaft can be accurately adjusted in the VVT control process, the problems of oil consumption, emission deterioration, knocking and the like caused by the deterioration of engine model accuracy are avoided, and the oil saving effect of Miller circulation and the engine safety are ensured.
In order to achieve the above object, an embodiment of the present invention provides a phase adjustment method for an engine camshaft, including:
detecting an operating condition of the engine in response to an engine condition detection operation;
when the operation working condition meets a preset specific working condition, calculating the inflation deviation of the engine based on a preset engine inflation model;
acquiring an initial position signal of a cam shaft, and correcting the initial position signal according to the inflation deviation; the initial position signal is a position signal of the cam shaft when the engine does not perform VVT control;
calculating a position difference value between the initial position signal and the corrected initial position signal;
the position difference value is applied to the VVT control process to adjust the phase of the camshaft.
As an improvement of the above-mentioned scheme, the response conditions of the engine condition detection operation are:
acquiring a crankshaft position signal and a camshaft position signal of the engine;
determining whether the engine satisfies a preset timing synchronization condition based on the crankshaft position signal and the camshaft position signal;
and responding to the engine working condition detection operation when the engine meets the timing synchronization condition.
As an improvement of the above, the timing synchronization condition is:
the marks of the crankshaft timing gear and the camshaft timing gear are aligned; wherein the signature of the crankshaft timing gear is determined from the crankshaft position signal and the signature of the camshaft timing gear is determined from the camshaft position signal.
As an improvement of the above scheme, the specific working condition includes at least one of the following:
the rotating speed of the engine is in a preset rotating speed range;
the load of the engine is in a preset load range;
the water temperature of the engine is greater than or equal to a preset water temperature threshold.
As an improvement of the above-mentioned scheme, the inflation model is a model built in advance for calculating the actual intake air amount of the engine; the calculating the charging deviation of the engine based on the preset engine charging model includes:
calibrating the inflation model according to the specific working condition so that the model air inflow in the inflation model is equal to the actual air inflow of the engine;
and when the model air inflow is detected to be unequal to the actual air inflow, determining the inflation deviation of the engine according to the Lambda closed loop correction coefficient in the oil circuit model.
As an improvement of the above-mentioned aspect, the correcting the initial position signal according to the inflation deviation includes:
when the model air inflow is larger than the actual air inflow, adding the initial position signal and the angle converted by the inflation deviation;
and when the model air inflow is smaller than the actual air inflow, subtracting the angle converted by the initial position signal and the inflation deviation.
In order to achieve the above object, an embodiment of the present invention further provides a phase adjustment device for an engine camshaft, including:
the operation condition detection module is used for responding to the detection operation of the engine condition and detecting the operation condition of the engine;
the inflation deviation calculation module is used for calculating the inflation deviation of the engine based on a preset engine inflation model when the operation working condition meets a preset specific working condition;
the initial position signal correction module is used for acquiring an initial position signal of the cam shaft and correcting the initial position signal according to the inflation deviation; the initial position signal is a position signal of the cam shaft when the engine does not perform VVT control;
the position deviation calculating module is used for calculating the position difference value between the initial position signal and the corrected initial position signal;
and a camshaft phase adjustment module for applying the position difference value to the VVT control process to adjust a phase of the camshaft.
As an improvement of the above-mentioned scheme, the response conditions of the engine condition detection operation are:
acquiring a crankshaft position signal and a camshaft position signal of the engine;
determining whether the engine satisfies a preset timing synchronization condition based on the crankshaft position signal and the camshaft position signal;
and responding to the engine working condition detection operation when the engine meets the timing synchronization condition.
To achieve the above object, an embodiment of the present invention further provides a phase adjustment apparatus of an engine camshaft, including a processor, a memory, and a computer program stored in the memory and configured to be executed by the processor, the processor implementing the phase adjustment method of an engine camshaft as described in any one of the above embodiments when executing the computer program.
To achieve the above object, an embodiment of the present invention further provides an engine including:
the crankshaft is arranged in such a way that,
a crankshaft position sensor for acquiring a position signal of the crankshaft;
a camshaft including an intake camshaft and an exhaust camshaft;
an exhaust phase adjuster for adjusting a phase of the exhaust camshaft;
an intake phase adjuster for adjusting a phase of the intake camshaft;
an exhaust camshaft position sensor for acquiring a position signal of the exhaust camshaft;
an intake camshaft position sensor for acquiring a position signal of the intake camshaft;
a control unit that executes the phase adjustment method of the engine camshaft according to any one of the embodiments described above.
Compared with the prior art, the method, the device, the equipment and the engine for adjusting the phase of the engine camshaft disclosed by the embodiment of the invention have the advantages that the VVT reference position self-learning is carried out when a vehicle is off line, the initial position signal is firstly corrected according to the inflation deviation condition of a specific working condition, the corrected initial position signal is stored in the memory, and the inflation deviation condition of the specific working condition basically reflects the actual phase assembly physical deviation degree, so that the actual phase assembly deviation and the signal error are taken into consideration for compensation calculation. In addition, by calculating the position difference value of the initial position signal and the corrected initial position signal, the position difference value can be applied to a VVT control process to adjust the phase of the cam shaft, so that the phase of the cam shaft can be accurately adjusted in the VVT control process, the problems of oil consumption, emission deterioration, knocking and the like caused by the deterioration of the engine model precision are avoided, and the oil saving effect of the Miller cycle and the engine safety are ensured.
Drawings
FIG. 1 is a flow chart of a method for adjusting the position of an engine camshaft provided by an embodiment of the present invention;
FIG. 2 is another flow chart of a method for adjusting the position of an engine camshaft according to an embodiment of the present invention;
FIG. 3 is a block diagram of an engine camshaft position adjustment device according to an embodiment of the present invention;
fig. 4 is a block diagram showing a position adjusting apparatus of an engine camshaft according to an embodiment of the present invention;
fig. 5 is a schematic structural view of an engine according to an embodiment of the present invention.
Wherein 301, a crankshaft position sensor; 302. a crankshaft; 303. an exhaust phase adjuster; 304. an exhaust oil control valve; 305. an exhaust camshaft; 306. an exhaust camshaft signal wheel; 307. an exhaust camshaft position sensor; 308. an intake camshaft position sensor; 309. an intake camshaft signal wheel; 310. an intake camshaft; 311. an intake phase adjuster; 312. an intake oil control valve; 313. and a control unit.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Referring to fig. 1, fig. 1 is a flowchart of a method for adjusting a position of an engine camshaft according to an embodiment of the present invention, where the method for adjusting a position of an engine camshaft includes:
s1, responding to engine working condition detection operation, and detecting the operation working condition of an engine;
s2, calculating the inflation deviation of the engine based on a preset engine inflation model when the operation working condition meets a preset specific working condition;
s3, acquiring an initial position signal of a cam shaft, and correcting the initial position signal according to the inflation deviation;
s4, calculating a position difference value between the initial position signal and the corrected initial position signal;
and S5, applying the position difference value to the VVT control process to adjust the phase of the cam shaft.
It should be noted that, the method for adjusting the phase of the engine camshaft according to the embodiment of the present invention is implemented by executing the control unit EMS in the engine, and the engine includes: a crankshaft; a crankshaft position sensor for acquiring a position signal of the crankshaft; a camshaft including an intake camshaft and an exhaust camshaft; an exhaust phase adjuster for adjusting a phase of the exhaust camshaft; an intake phase adjuster for adjusting a phase of the intake camshaft; an exhaust camshaft position sensor for acquiring a position signal of the exhaust camshaft; an intake camshaft position sensor for acquiring a position signal of the intake camshaft; and a control unit that executes the steps S1 to S5.
The engine disclosed by the embodiment of the invention adopts the VVT technology, and is characterized in that the engine can ensure stable combustion, reduce oil consumption, effectively improve the emission of hydrocarbon and oxynitride, expand the charging efficiency and improve the combustion performance. The VVT is used to adjust the opening and closing timing of the valve, and is achieved by changing the position of the camshaft relative to the crankshaft, mainly by hydraulic or electric motors.
Specifically, in step S1, the response condition of the engine condition detection operation is:
s101, acquiring a crankshaft position signal and a camshaft position signal of the engine;
s102, determining whether the engine meets a preset timing synchronization condition or not based on the crankshaft position signal and the camshaft position signal;
s103, responding to the engine working condition detection operation when the engine meets the timing synchronization condition.
Illustratively, the timing synchronization condition is: the marks of the crankshaft timing gear and the camshaft timing gear are aligned; wherein the signature of the crankshaft timing gear is determined from the crankshaft position signal and the signature of the camshaft timing gear is determined from the camshaft position signal. In order to ensure that the distribution timing and the injection timing of the engine are correct, when the engine is assembled, marks on timing gears are required to be aligned, the timing synchronization aims to ensure that actions of a cam shaft and a crank shaft are synchronously matched, and the alignment of the timing gears of the crank shaft and the cam shaft can be movably calibrated in a way of designing the marks.
Specifically, in step S2, the specific working condition includes at least one of the following:
the rotating speed of the engine is in a preset rotating speed range;
the load of the engine is in a preset load range;
the water temperature of the engine is greater than or equal to a preset water temperature threshold.
The rotational speed is in the range of 500 to 2500rpm, i.e. the rotational speed N satisfies: n is more than or equal to 500rpm and less than or equal to 2500rpm; the load range is 5-50%, namely the load T meets the following conditions: t is more than or equal to 5% and less than or equal to 50%; the water temperature threshold is 0 ℃.
Specifically, the inflation model is a model built in advance for calculating the actual air intake amount of the engine; the calculating the charging deviation of the engine based on the preset engine charging model includes steps S201 to S202:
s201, calibrating the inflation model according to the specific working condition so that the model air inflow in the inflation model is equal to the actual air inflow of the engine;
s202, when the model air inflow is detected to be unequal to the actual air inflow, determining the inflation deviation of the engine according to the Lambda closed loop correction coefficient in the oil circuit model.
For example, the inflation model may be built with reference to the prior art, for example, reference may be made to an air intake dynamic model, which is not described herein. Lambda refers to an oxygen sensor, which is an indispensable element in an engine that uses a three-way catalytic converter to reduce exhaust gas pollution, and functions as an engine that reduces exhaust gas pollution. Since the purifying ability of the three-way catalyst to CO, HC and NOx is drastically reduced once the air-fuel ratio of the mixture deviates from the stoichiometric air-fuel ratio, an oxygen sensor is installed in the exhaust pipe to detect the concentration of oxygen in the exhaust gas and send a feedback signal to the control unit, and the control unit controls the increase or decrease of the fuel injection amount of the fuel injector, thereby controlling the air-fuel ratio of the mixture to be near the stoichiometric value. The closed loop correction coefficient refers to the ratio of the fuel injection quantity to the engine air inflow.
During calibration, the inflation model is precisely calibrated, namely, the model air inflow=the actual air inflow, and then the closed-loop correction coefficient of lambda=1 during fuel injection according to the model air inflow. If the actual phase of the engine is provided with larger deviation, and the actual air inflow is larger due to the deviation, and the model air inflow is smaller than the actual air inflow at the moment, when the fuel is injected according to the model air inflow, the closed-loop correction coefficient of Lambda is larger than 1, and the deviation of inflation can be measured according to the Lambda closed-loop correction coefficient; otherwise, the deviation makes the actual air inflow smaller, and the model air inflow is larger than the actual air inflow at the moment, so that the closed loop correction coefficient of Lambda is smaller than 1 when the fuel is injected according to the model air inflow.
Specifically, in step S3, the initial position signal is a position signal of the camshaft when the engine is not performing VVT control. I.e. the initial position signal is that the VVT has not changed the position of the camshaft, say that the exhaust camshaft is in the most advanced position (which may retard the exhaust camshaft if the exhaust VVT is active) and the intake cam is in the most retarded position (which may advance the intake camshaft if the intake VVT is active).
Optionally, the correcting the initial position signal according to the inflation deviation includes steps S301 to S302:
s301, adding the initial position signal and the converted angle of the inflation deviation when the model air inflow is larger than the actual air inflow;
s302, when the model air inflow is smaller than the actual air inflow, subtracting the angle converted by the initial position signal and the inflation deviation.
For example, the inflation deviation calculated in step S2 is a value, and the corresponding angles (the position signals of the cam shaft are all angles) are obtained after the inflation deviation is converted, and the converted angles can be used for correcting the initial position signals of the cam shaft according to a preset mapping table. If the model charge is smaller, the actual charge is larger, and the initial position signal is reduced. If the model is inflated more, the actual air intake is smaller, and the initial position signal is increased. The specific implementation process can be realized by making a corresponding curve of the inflation deviation condition and the initial position signal correction value in software.
Further, in steps S4 to S5, referring to fig. 2, fig. 2 shows a VVT self-learning operation process of the control unit EMS of the engine, an initial position signal of the camshaft is assigned to a VVT first self-learning value, the VVT first self-learning is completed, then the initial position signal of the camshaft is assigned to a VVT current self-learning value, and finally a position difference value between the VVT current self-learning value and the corrected VVT first self-learning value is calculated, and the position difference value is applied to a VVT control process to adjust the phase of the camshaft. It can be appreciated that during the VVT control process, the position difference may be used to correct the position signal of the camshaft calculated by the VVT itself, so that the phase of the camshaft may be accurately adjusted during the VVT control process.
Compared with the prior art, the phase adjustment method of the engine camshaft disclosed by the embodiment of the invention is characterized in that the VVT reference position self-learning is carried out when a vehicle is off line, the initial position signal is firstly corrected according to the inflation deviation condition of a specific working condition, the corrected initial position signal is stored in the memory, and the inflation deviation condition of the specific working condition basically reflects the actual phase assembly physical deviation degree, so that the actual phase assembly deviation and the signal error are taken into consideration for compensation calculation. In addition, by calculating the position difference value of the initial position signal and the corrected initial position signal, the position difference value can be applied to a VVT control process to adjust the phase of the cam shaft, so that the phase of the cam shaft can be accurately adjusted in the VVT control process, the problems of oil consumption, emission deterioration, knocking and the like caused by the deterioration of the engine model precision are avoided, and the oil saving effect of the Miller cycle and the engine safety are ensured.
Referring to fig. 3, fig. 3 is a block diagram of a position adjustment device 10 for an engine camshaft according to an embodiment of the present invention, where the position adjustment device 10 for an engine camshaft includes:
an operation condition detection module 11 for detecting an operation condition of the engine in response to an engine condition detection operation;
a charge bias calculation module 12 for calculating a charge bias of the engine based on a preset engine charge model when the operating conditions satisfy a preset specific condition;
an initial position signal correction module 13, configured to obtain an initial position signal of a camshaft, and correct the initial position signal according to the inflation deviation; the initial position signal is a position signal of the cam shaft when the engine does not perform VVT control;
a position deviation calculating module 14 for calculating a position difference between the initial position signal and the corrected initial position signal;
a camshaft phase adjustment module 15 for applying the position difference value to the VVT control process to adjust the phase of the camshaft.
It should be noted that, the phase adjustment device 10 of the engine camshaft according to the embodiment of the present invention is a control unit EMS in an engine, and the engine includes: a crankshaft; a crankshaft position sensor for acquiring a position signal of the crankshaft; a camshaft including an intake camshaft and an exhaust camshaft; an exhaust phase adjuster for adjusting a phase of the exhaust camshaft; an intake phase adjuster for adjusting a phase of the intake camshaft; an exhaust camshaft position sensor for acquiring a position signal of the exhaust camshaft; an intake camshaft position sensor for acquiring a position signal of the intake camshaft; and a control unit which is the phase adjustment device 10 of the engine camshaft.
Specifically, the response conditions of the engine condition detection operation are:
acquiring a crankshaft position signal and a camshaft position signal of the engine;
determining whether the engine satisfies a preset timing synchronization condition based on the crankshaft position signal and the camshaft position signal;
and responding to the engine working condition detection operation when the engine meets the timing synchronization condition.
Specifically, the timing synchronization condition is:
the marks of the crankshaft timing gear and the camshaft timing gear are aligned; wherein the signature of the crankshaft timing gear is determined from the crankshaft position signal and the signature of the camshaft timing gear is determined from the camshaft position signal.
Specifically, the specific working condition includes at least one of the following:
the rotating speed of the engine is in a preset rotating speed range;
the load of the engine is in a preset load range;
the water temperature of the engine is greater than or equal to a preset water temperature threshold.
Specifically, the inflation model is a model built in advance for calculating the actual air intake amount of the engine; the inflation bias calculation module 12 is configured to:
calibrating the inflation model according to the specific working condition so that the model air inflow in the inflation model is equal to the actual air inflow of the engine;
and when the model air inflow is detected to be unequal to the actual air inflow, determining the inflation deviation of the engine according to the Lambda closed loop correction coefficient in the oil circuit model.
The initial position signal correction module 13 is configured to:
when the model air inflow is larger than the actual air inflow, adding the initial position signal and the angle converted by the inflation deviation;
and when the model air inflow is smaller than the actual air inflow, subtracting the angle converted by the initial position signal and the inflation deviation.
It should be noted that, the specific operation of the phase adjustment device 10 of the engine camshaft may refer to the operation of the phase adjustment method of the engine camshaft described in the above embodiment, and will not be described herein.
Compared with the prior art, the phase adjustment device 10 of the engine camshaft disclosed in the embodiment of the invention corrects the initial position signal according to the inflation deviation condition of the specific working condition by performing the VVT reference position self-learning when the vehicle is off-line, and the corrected initial position signal is stored in the memory, wherein the inflation deviation condition of the specific working condition basically reflects the actual phase assembly physical deviation degree, so that the actual phase assembly deviation and the signal error are taken into consideration for compensation calculation. In addition, by calculating the position difference value of the initial position signal and the corrected initial position signal, the position difference value can be applied to a VVT control process to adjust the phase of the cam shaft, so that the phase of the cam shaft can be accurately adjusted in the VVT control process, the problems of oil consumption, emission deterioration, knocking and the like caused by the deterioration of the engine model precision are avoided, and the oil saving effect of the Miller cycle and the engine safety are ensured.
Referring to fig. 4, fig. 4 is a block diagram showing a position adjusting apparatus 20 of an engine camshaft according to an embodiment of the present invention, the position adjusting apparatus 20 of the engine camshaft including: a processor 21, a memory 22 and a computer program stored in said memory 22 and executable on said processor 21. The processor 21, when executing the computer program, implements the steps in the embodiment of the method for adjusting the position of the engine camshaft according to the first embodiment. Alternatively, the processor 21 may implement the functions of the modules/units in the above-described device embodiments when executing the computer program.
Illustratively, the computer program may be partitioned into one or more modules/units that are stored in the memory 22 and executed by the processor 21 to complete the present invention. The one or more modules/units may be a series of computer program instruction segments capable of performing a specific function for describing the execution of the computer program in the position adjustment device 20 of the engine camshaft.
The engine camshaft position adjustment device 20 may be a computing device such as a desktop computer, a notebook computer, a palm computer, a cloud server, etc. The position adjustment device 20 of the engine camshaft may include, but is not limited to, a processor 21, a memory 22. It will be appreciated by those skilled in the art that the schematic diagram is merely an example of the position adjustment device 20 of the engine camshaft and does not constitute a limitation of the position adjustment device 20 of the engine camshaft, and may include more or less components than illustrated, or may combine certain components, or different components, for example, the position adjustment device 20 of the engine camshaft may further include an input-output device, a network access device, a bus, and the like.
The processor 21 may be a central processing unit (Central Processing Unit, CPU), but may also be other general purpose processors, digital signal processors (Digital Signal Processor, DSP), application specific integrated circuits (Application Specific Integrated Circuit, ASIC), off-the-shelf programmable gate arrays (Field-Programmable Gate Array, FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, or the like. The general purpose processor may be a microprocessor or the processor may be any conventional processor or the like, and the processor 21 is a control center of the position adjustment apparatus 20 of the engine camshaft, and connects the respective parts of the position adjustment apparatus 20 of the entire engine camshaft using various interfaces and lines.
The memory 22 may be used to store the computer program and/or module, and the processor 21 may implement various functions of the position adjustment device 20 of the engine camshaft by executing or executing the computer program and/or module stored in the memory 22, and invoking data stored in the memory 22. The memory 22 may mainly include a storage program area and a storage data area, wherein the storage program area may store an operating system, an application program (such as a sound playing function, an image playing function, etc.) required for at least one function, and the like; the storage data area may store data (such as audio data, phonebook, etc.) created according to the use of the handset, etc. In addition, the memory 22 may include high-speed random access memory, and may also include non-volatile memory, such as a hard disk, memory, plug-in hard disk, smart Media Card (SMC), secure Digital (SD) Card, flash Card (Flash Card), at least one disk storage device, flash memory device, or other volatile solid-state storage device.
Wherein the integrated modules/units of the position adjustment device 20 of the engine camshaft may be stored in a computer readable storage medium if implemented in the form of software functional units and sold or used as a separate product. Based on such understanding, the present invention may implement all or part of the flow of the method of the above embodiment, or may be implemented by a computer program to instruct related hardware, where the computer program may be stored in a computer readable storage medium, and the computer program may implement the steps of each of the method embodiments described above when executed by the processor 21. Wherein the computer program comprises computer program code which may be in source code form, object code form, executable file or some intermediate form etc. The computer readable medium may include: any entity or device capable of carrying the computer program code, a recording medium, a U disk, a removable hard disk, a magnetic disk, an optical disk, a computer Memory, a Read-Only Memory (ROM), a random access Memory (RAM, random Access Memory), an electrical carrier signal, a telecommunications signal, a software distribution medium, and so forth.
It should be noted that the above-described apparatus embodiments are merely illustrative, and the units described as separate units may or may not be physically separate, and units shown as units may or may not be physical units, may be located in one place, or may be distributed over a plurality of network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of this embodiment. In addition, in the drawings of the embodiment of the device provided by the invention, the connection relation between the modules represents that the modules have communication connection, and can be specifically implemented as one or more communication buses or signal lines. Those of ordinary skill in the art will understand and implement the present invention without undue burden.
Referring to fig. 5, fig. 5 is a schematic structural diagram of an engine 30 according to an embodiment of the present invention, where the engine 30 includes:
the crankshaft 302 is coupled to a crankshaft,
a crankshaft position sensor 301 for acquiring a position signal of the crankshaft;
a camshaft including an intake camshaft 310 and an exhaust camshaft 305;
an exhaust phase adjuster 303 for adjusting a phase of the exhaust camshaft;
an intake phase adjuster 311 for adjusting a phase of the intake camshaft;
an exhaust camshaft position sensor 307 for acquiring a position signal of the exhaust camshaft;
an intake camshaft position sensor 308 for acquiring a position signal of the intake camshaft;
a control unit 313 that executes the phase adjustment method of the engine camshaft as described in the above embodiment.
Further, the engine 30 further includes an exhaust oil control valve 304, an exhaust camshaft signal wheel 306, an intake camshaft signal wheel 309, and an intake oil control valve 312. The operation of the exhaust oil control valve 304, the exhaust camshaft signal wheel 306, the intake camshaft signal wheel 309, and the intake oil control valve 312 may refer to the prior art, and will not be described herein.
Compared with the prior art, the engine 30 disclosed in the embodiment of the invention corrects the initial position signal according to the inflation deviation condition of the specific working condition by performing the VVT reference position self-learning when the vehicle is off-line, and the corrected initial position signal is stored in the memory, wherein the inflation deviation condition of the specific working condition basically reflects the physical deviation degree of the actual phase assembly, so that the actual phase assembly deviation and the signal error are taken into consideration for compensation calculation. In addition, by calculating the position difference value of the initial position signal and the corrected initial position signal, the position difference value can be applied to a VVT control process to adjust the phase of the cam shaft, so that the phase of the cam shaft can be accurately adjusted in the VVT control process, the problems of oil consumption, emission deterioration, knocking and the like caused by the deterioration of the engine model precision are avoided, and the oil saving effect of the Miller cycle and the engine safety are ensured.
While the foregoing is directed to the preferred embodiments of the present invention, it will be appreciated by those skilled in the art that changes and modifications may be made without departing from the principles of the invention, such changes and modifications are also intended to be within the scope of the invention.
Claims (6)
1. A phase adjustment method of an engine camshaft, comprising:
detecting an operating condition of the engine in response to an engine condition detection operation;
when the operation working condition meets a preset specific working condition, calculating the inflation deviation of the engine based on a preset engine inflation model;
acquiring an initial position signal of a cam shaft, and correcting the initial position signal according to the inflation deviation; the initial position signal is a position signal of the cam shaft when the engine does not perform VVT control;
calculating a position difference value between the initial position signal and the corrected initial position signal;
applying the position difference value to the VVT control process to adjust the phase of the camshaft;
the inflation model is a model which is built in advance and used for calculating the actual air inflow of the engine;
the calculating the charging deviation of the engine based on the preset engine charging model comprises the following steps:
calibrating the inflation model according to the specific working condition so that the model air inflow in the inflation model is equal to the actual air inflow of the engine;
when the model air inflow is detected to be unequal to the actual air inflow, determining the inflation deviation of the engine according to a Lambda closed loop correction coefficient in an oil circuit model;
the correcting the initial position signal according to the inflation deviation comprises the following steps:
when the model air inflow is larger than the actual air inflow, adding the initial position signal and the angle converted by the inflation deviation;
when the model air inflow is smaller than the actual air inflow, subtracting the angle converted by the initial position signal and the inflation deviation;
the response conditions of the engine working condition detection operation are as follows:
acquiring a crankshaft position signal and a camshaft position signal of the engine;
determining whether the engine satisfies a preset timing synchronization condition based on the crankshaft position signal and the camshaft position signal;
and responding to the engine working condition detection operation when the engine meets the timing synchronization condition.
2. The phase adjustment method of an engine camshaft according to claim 1, wherein the timing synchronization condition is:
the marks of the crankshaft timing gear and the camshaft timing gear are aligned; wherein the signature of the crankshaft timing gear is determined from the crankshaft position signal and the signature of the camshaft timing gear is determined from the camshaft position signal.
3. The method of phase adjustment of an engine camshaft of claim 1, wherein the particular operating conditions include at least one of:
the rotating speed of the engine is in a preset rotating speed range;
the load of the engine is in a preset load range;
the water temperature of the engine is greater than or equal to a preset water temperature threshold.
4. A phase adjustment device for an engine camshaft, comprising:
the operation condition detection module is used for responding to the detection operation of the engine condition and detecting the operation condition of the engine;
the inflation deviation calculation module is used for calculating the inflation deviation of the engine based on a preset engine inflation model when the operation working condition meets a preset specific working condition;
the initial position signal correction module is used for acquiring an initial position signal of the cam shaft and correcting the initial position signal according to the inflation deviation; the initial position signal is a position signal of the cam shaft when the engine does not perform VVT control;
the position deviation calculating module is used for calculating the position difference value between the initial position signal and the corrected initial position signal;
a camshaft phase adjustment module for applying the position difference to the VVT control process to adjust a phase of the camshaft;
the inflation model is a model which is built in advance and used for calculating the actual air inflow of the engine;
the inflation deviation calculation module is configured to:
calibrating the inflation model according to the specific working condition so that the model air inflow in the inflation model is equal to the actual air inflow of the engine;
when the model air inflow is detected to be unequal to the actual air inflow, determining the inflation deviation of the engine according to a Lambda closed loop correction coefficient in an oil circuit model;
the initial position signal correction module is used for:
when the model air inflow is larger than the actual air inflow, adding the initial position signal and the angle converted by the inflation deviation;
when the model air inflow is smaller than the actual air inflow, subtracting the angle converted by the initial position signal and the inflation deviation;
the response conditions of the engine working condition detection operation are as follows:
acquiring a crankshaft position signal and a camshaft position signal of the engine;
determining whether the engine satisfies a preset timing synchronization condition based on the crankshaft position signal and the camshaft position signal;
and responding to the engine working condition detection operation when the engine meets the timing synchronization condition.
5. A phase adjustment apparatus of an engine camshaft, characterized by comprising a processor, a memory, and a computer program stored in the memory and configured to be executed by the processor, the processor implementing the phase adjustment method of an engine camshaft according to any one of claims 1 to 3 when executing the computer program.
6. An engine, comprising:
the crankshaft is arranged in such a way that,
a crankshaft position sensor for acquiring a position signal of the crankshaft;
a camshaft including an intake camshaft and an exhaust camshaft;
an exhaust phase adjuster for adjusting a phase of the exhaust camshaft;
an intake phase adjuster for adjusting a phase of the intake camshaft;
an exhaust camshaft position sensor for acquiring a position signal of the exhaust camshaft;
an intake camshaft position sensor for acquiring a position signal of the intake camshaft;
a control unit that executes the phase adjustment method of the engine camshaft according to any one of the above claims 1 to 3.
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