CN116733649A - Detection control system for idle speed of automobile engine - Google Patents
Detection control system for idle speed of automobile engine Download PDFInfo
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- CN116733649A CN116733649A CN202310694088.0A CN202310694088A CN116733649A CN 116733649 A CN116733649 A CN 116733649A CN 202310694088 A CN202310694088 A CN 202310694088A CN 116733649 A CN116733649 A CN 116733649A
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- 238000001514 detection method Methods 0.000 title claims abstract description 28
- 230000008859 change Effects 0.000 claims abstract description 81
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 55
- 239000001301 oxygen Substances 0.000 claims abstract description 55
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 55
- 238000002347 injection Methods 0.000 claims abstract description 35
- 239000007924 injection Substances 0.000 claims abstract description 35
- 239000000446 fuel Substances 0.000 claims abstract description 34
- 230000009467 reduction Effects 0.000 claims description 12
- 230000001276 controlling effect Effects 0.000 claims description 4
- 230000002596 correlated effect Effects 0.000 claims description 4
- 230000003247 decreasing effect Effects 0.000 claims description 4
- 239000007789 gas Substances 0.000 claims description 4
- 229940090046 jet injector Drugs 0.000 claims description 3
- 239000002912 waste gas Substances 0.000 claims description 3
- 230000002159 abnormal effect Effects 0.000 description 15
- 230000000875 corresponding effect Effects 0.000 description 12
- 238000002485 combustion reaction Methods 0.000 description 6
- 238000000034 method Methods 0.000 description 5
- 230000005856 abnormality Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 230000001105 regulatory effect Effects 0.000 description 4
- 230000007423 decrease Effects 0.000 description 3
- 230000002829 reductive effect Effects 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
- 238000004891 communication Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000036961 partial effect Effects 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- 229910000838 Al alloy Inorganic materials 0.000 description 1
- 229910001018 Cast iron Inorganic materials 0.000 description 1
- 230000001133 acceleration Effects 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000004069 differentiation Effects 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 230000002401 inhibitory effect Effects 0.000 description 1
- 230000000670 limiting effect Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/02—Circuit arrangements for generating control signals
- F02D41/04—Introducing corrections for particular operating conditions
- F02D41/08—Introducing corrections for particular operating conditions for idling
- F02D41/086—Introducing corrections for particular operating conditions for idling taking into account the temperature of the engine
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/02—Circuit arrangements for generating control signals
-
- 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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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
Abstract
The invention relates to the field of idle speed control, in particular to a detection control system for an automobile engine idle speed, which comprises a power device, a detection device and a central control processor, wherein the central control processor generates an idle speed change curve based on a rotating speed value, judges the idle speed state of the automobile based on the idle speed change curve, adjusts the valve opening of an air inlet unit based on an air flow value in real time in a first idle state, calculates an air inlet characteristic parameter based on an air inlet parameter in a second idle state, adjusts the valve opening of the air inlet unit based on the air inlet characteristic parameter, and judges whether to adjust the injection flow of a fuel injector based on the change condition of an oxygen concentration value after adjusting the valve opening.
Description
Technical Field
The invention relates to the field of idle speed control, in particular to a detection control system for idle speed of an automobile engine.
Background
The idling of the automobile engine is a state that the rotating speed is kept in a certain range when the automobile stops or the running speed is slower, and the detection and control of the idling of the automobile engine can ensure the normal operation of the engine, reduce emission pollution, improve fuel economy and improve driving comfort, so that the automobile engine has very important significance.
Chinese patent publication No.: CN112343722a discloses the following, which relates to an automobile idle speed control method, and belongs to the technical field of automobiles. The method solves the problems that the existing idle speed control method still needs to step on the accelerator frequently during creeping, and the driving comfort is insufficient. The automobile idle speed control method comprises the following steps: the TCU judges whether the condition of entering idle speed control is met according to the current gear, the brake signal and the accelerator opening of the vehicle, when the condition of entering idle speed control is met, the TCU enters idle speed request control, calculates the current gradient value of the vehicle according to the longitudinal acceleration signal and the vehicle speed signal, acquires a corresponding engine target idle speed value according to the calculated current gradient value and the current vehicle speed value and outputs an idle speed request signal to the ECU, and the ECU responds to the idle speed request signal and adjusts the idle speed of the engine to the engine target idle speed value; when the condition of entering the idle speed control is not met, the TCU exits the idle speed request control, and the ECU controls the engine idle speed value to be restored to the initial idle speed value. The automobile idle speed control method can improve driving comfort.
However, the prior art has the following problems:
in the prior art, various running units of an automobile engine are not adaptively adjusted and corrected according to different change conditions of the engine speed when the automobile engine is idling, so that the idling control effect of the engine is improved.
Disclosure of Invention
In order to solve the above problems, the present invention provides a detection control system for detecting an idle speed of an automobile engine, comprising:
the power device comprises a cylinder body, an air inlet unit arranged at the top of the cylinder body and used for introducing air into the cylinder body, an exhaust unit arranged at the bottom of the cylinder body and used for exhausting combusted waste gas, and a rotating unit arranged inside the cylinder body and used for outputting power;
the detection device comprises an oxygen concentration acquisition unit, a rotating speed acquisition unit, an air pressure acquisition unit, an air temperature acquisition unit and an air flow acquisition unit, wherein the oxygen concentration acquisition unit is arranged on the exhaust unit and used for detecting the oxygen concentration value in exhaust gas of the cylinder body;
a central control processor, which comprises an analysis unit, a first control unit and a second control unit which are connected with each other,
the analysis unit is connected with the detection device and is used for generating an idle speed change curve based on the rotating speed value and judging the idle speed state of the automobile based on the idle speed change curve, wherein the idle speed state comprises a first idle speed state and a second idle speed state;
the first control unit is connected with the power device and the detection device and is used for adjusting the valve opening of the air inlet unit based on the air flow value in real time when the analysis unit judges that the idle state of the automobile is a first idle state until the air flow value is in a preset reasonable flow interval;
the second control unit is connected with the power device and the detection device, and is used for calculating an air inlet characteristic parameter based on an air inlet parameter when the analysis unit judges that the idle state of the automobile is the second idle state, adjusting the valve opening of the air inlet unit based on the air inlet characteristic parameter, judging whether the injection flow of the fuel injector needs to be adjusted based on the change condition of the oxygen concentration value after the valve opening is adjusted, wherein the air inlet parameter comprises an air pressure value, an air temperature value and an air flow value.
Further, the analysis unit generates an idle speed change curve based on the rotation speed value, wherein,
and the analysis unit takes time as an X axis, takes the rotating speed value as a Y axis to construct a rectangular coordinate system, and constructs the idling change curve in the rectangular coordinate system.
Further, the analysis unit determines a fluctuation parameter of the idle speed change curve, wherein,
the analysis unit constructs a plurality of straight lines parallel to the Y axis and equal in distance in the rectangular coordinate system to divide the idle speed change curve into a plurality of idle speed change curve segments, determines the slope K of the midpoint of each idle speed change curve segment, calculates the fluctuation parameter delta K of the idle speed change curve according to a formula (1),
in the formula (1), K i+1 Represents the slope, K, of the midpoint of the i+1st idle speed change curve segment i Represents the slope of the midpoint of the ith idle speed change curve segment, n represents the number of idle speed change curve segments, and i represents an integer greater than 0.
Further, the analysis unit determines an idle state of the vehicle based on the idle speed change curve, wherein,
the analysis unit compares the fluctuation parameter with a preset slope comparison interval, the midpoint of the slope comparison interval is 0,
under the first slope comparison condition, the analysis unit judges that the idle state of the automobile is a first idle state;
under the second slope comparison condition, the analysis unit judges that the idle state of the automobile is a second idle state;
the first slope comparison condition is that the fluctuation parameter is in the preset slope comparison interval, the absolute value of the fluctuation parameter is larger than a preset stability index threshold, the second slope comparison condition is that the fluctuation parameter is not in the preset slope comparison interval, and the stability index threshold is determined based on the upper limit of the slope comparison interval.
Further, the first control unit adjusts the valve opening of the air inlet unit in real time based on the air flow value until the air flow value is within a preset reasonable flow interval, wherein,
the first control unit compares the air flow value with a preset reasonable flow interval in real time,
the first control unit reduces the valve opening of the air inlet unit under a first flow rate comparison condition;
under a second flow rate comparison condition, the first control unit increases the valve opening of the air inlet unit;
the first flow rate comparison condition is that the air flow rate value is larger than the upper limit of the reasonable flow rate interval, and the second flow rate comparison condition is that the air flow rate value is smaller than the lower limit of the reasonable flow rate interval.
Further, the second control unit calculates an intake characteristic parameter based on the intake parameter, wherein,
the second control unit determines the intake parameter, calculates an intake characteristic parameter E according to formula (2),
in the formula (2), P represents an air pressure value, T represents an air temperature value, Q represents an air flow value, P0 represents a preset pressure comparison parameter, T0 represents a preset temperature comparison parameter, and Q0 represents a preset flow comparison parameter.
Further, the second control unit adjusts a valve opening degree of the intake unit based on the intake characteristic parameter, wherein,
under a first preset condition, reducing the valve opening, wherein the reduction is positively correlated with the air inlet characteristic parameter;
under a second preset condition, increasing the valve opening, wherein the increasing amount is inversely related to the air inlet characteristic parameter;
the first preset condition is that the fluctuation parameter of the idle speed change curve is a positive value, and the second preset condition is that the fluctuation parameter of the idle speed change curve is a negative value.
Further, the second control unit determines whether or not the injection flow rate of the fuel injector needs to be adjusted based on the change of the oxygen concentration value after the valve opening is adjusted, wherein,
comparing the oxygen concentration value with a preset oxygen concentration comparison interval;
and if the oxygen concentration value does not belong to the oxygen concentration comparison section, judging that the injection flow of the fuel injector needs to be adjusted, including increasing the injection flow of the fuel injector or decreasing the injection flow of the fuel injector.
Further, the second control unit determines to control the valve opening to return to the initial opening when the injection flow rate of the fuel injector is adjusted.
Further, the air inlet unit comprises an air inlet pipe, a valve arranged in the air inlet pipe and an oil jet injector, wherein the opening degree of the valve can be adjusted, and the oil jet injector can adjust the jet flow.
Compared with the prior art, the invention has the advantages that the power device, the detection device and the central control processor are arranged, the central control processor generates the idle speed change curve based on the rotating speed value, the idle speed state of the automobile is judged based on the idle speed change curve, the valve opening of the air inlet unit is regulated based on the air flow value in real time in the first idle speed state, the air inlet characteristic parameter is calculated based on the air inlet parameter in the second idle speed state, the valve opening of the air inlet unit is regulated based on the air inlet characteristic parameter, whether the injection flow of the fuel injector is required to be regulated or not is judged based on the change condition of the oxygen concentration value after the valve opening is regulated, and the invention can correspondingly and automatically adaptively regulate the valve opening of the air inlet unit or the injection flow of the fuel injector, thereby improving the control of relevant operation parameters of the engine when the idle speed of the engine is abnormal, and improving the reliability and efficiency for inhibiting the abnormal idle speed of the engine.
In particular, in the invention, an idle speed change curve is generated by an analysis unit based on a rotating speed value, and the idle speed state of an automobile is judged based on the idle speed change curve, wherein the idle speed change curve is a curve formed by the change of the rotating speed value of an automobile engine along with time, in the actual situation, the idle speed of the automobile engine is in a normal range but has the unstable condition of fluctuation up and down, often, the fluctuation parameter of the idle speed change curve is in a stable section, in the abnormal situation, the fluctuation of the rotating speed can have larger fluctuation in a certain period, and in different fluctuation situations, the main factors influencing the idle speed also have partial difference.
In particular, in the invention, the first control unit adjusts the valve opening of the air inlet unit based on the air flow value in real time in the first idle state until the air flow value is in a preset reasonable flow interval, in the actual situation, in the first idle state that the idle speed of the automobile engine fluctuates up and down but the fluctuation amount is smaller, the valve opening of the air inlet unit can be properly adjusted based on the air flow only, the shake is reduced, and the riding comfort is improved.
In particular, in the invention, the second control unit calculates the air intake characteristic parameter based on the air intake parameter in the second idle state, adjusts the valve opening of the air intake unit based on the air intake characteristic parameter, judges whether the injection flow of the fuel injector needs to be adjusted based on the change condition of the oxygen concentration value after the valve opening is adjusted, and determines whether the injection flow of the fuel injector according to the change condition of the oxygen concentration value after the valve opening is adjusted, wherein the main factors influencing the idle speed stability of the automobile engine are the air flow entering the engine cylinder, and other factors, including the air flow, the air pressure and the air temperature, of course, when the parameters are abnormal, the engine can generate a choking phenomenon, because the engine control system needs to keep a proper air-fuel ratio (the proportion of air and fuel) and the air intake characteristic parameter is abnormal, the air-fuel ratio is correspondingly higher, so that the combustion of the engine is unstable, the phenomenon of fluctuation of the rotation speed is caused, the abnormal condition is mainly caused by the valve abnormality and the abnormal injection quantity, the valve opening of the air intake characteristic parameter is firstly adaptively determined according to the adjustment quantity of the air intake unit, and the oxygen concentration contrast interval is determined according to the adjustment quantity, if the change condition of the oxygen concentration after the valve opening is adjusted does not accord with the preset standard, the condition is indicated that the quantity is insufficient or is insufficient, when the oxygen concentration is not in the change condition, the oxygen concentration is corresponding to the preset standard, when the oxygen concentration is adjusted, the oxygen concentration is relatively is higher than the valve opening is adjusted, the oxygen concentration is corresponding to the valve opening, and the oxygen injection valve is adjusted is relatively high when the oxygen is adjusted when the oxygen is compared with the abnormal when the change value is corresponding to the valve opening value is adjusted when the valve opening is corresponding to the change value is corresponding to the valve opening, the reliability and efficiency of suppressing the engine idling abnormality are improved.
Drawings
FIG. 1 is a schematic diagram of a system for detecting and controlling idle speed of an automobile engine according to an embodiment of the invention;
FIG. 2 is a schematic diagram of a central control processor according to an embodiment of the invention.
Detailed Description
In order that the objects and advantages of the invention will become more apparent, the invention will be further described with reference to the following examples; it should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
Preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are merely for explaining the technical principles of the present invention, and are not intended to limit the scope of the present invention.
It should be noted that, in the description of the present invention, terms such as "upper," "lower," "left," "right," "inner," "outer," and the like indicate directions or positional relationships based on the directions or positional relationships shown in the drawings, which are merely for convenience of description, and do not indicate or imply that the apparatus or elements must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present invention.
Furthermore, it should be noted that, in the description of the present invention, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention can be understood by those skilled in the art according to the specific circumstances.
Referring to fig. 1 and fig. 2, which are schematic diagrams of a detection control system for idle speed of an automobile engine and a schematic diagram of a central control processor according to an embodiment of the invention, the detection control system for idle speed of an automobile engine of the invention includes:
the power device comprises a cylinder body, an air inlet unit arranged at the top of the cylinder body and used for introducing air into the cylinder body, an exhaust unit arranged at the bottom of the cylinder body and used for exhausting combusted waste gas, and a rotating unit arranged inside the cylinder body and used for outputting power;
the detection device comprises an oxygen concentration acquisition unit, a rotating speed acquisition unit, an air pressure acquisition unit, an air temperature acquisition unit and an air flow acquisition unit, wherein the oxygen concentration acquisition unit is arranged on the exhaust unit and used for detecting the oxygen concentration value in exhaust gas of the cylinder body;
a central control processor, which comprises an analysis unit, a first control unit and a second control unit which are connected with each other,
the analysis unit is connected with the detection device and is used for generating an idle speed change curve based on the rotating speed value and judging the idle speed state of the automobile based on the idle speed change curve, wherein the idle speed state comprises a first idle speed state and a second idle speed state;
the first control unit is connected with the power device and the detection device and is used for adjusting the valve opening of the air inlet unit based on the air flow value in real time when the analysis unit judges that the idle state of the automobile is a first idle state until the air flow value is in a preset reasonable flow interval;
the second control unit is connected with the power device and the detection device, and is used for calculating an air inlet characteristic parameter based on an air inlet parameter when the analysis unit judges that the idle state of the automobile is the second idle state, adjusting the valve opening of the air inlet unit based on the air inlet characteristic parameter, judging whether the injection flow of the fuel injector needs to be adjusted based on the change condition of the oxygen concentration value after the valve opening is adjusted, wherein the air inlet parameter comprises an air pressure value, an air temperature value and an air flow value.
Specifically, the power device also comprises a cooling unit which is arranged outside the cylinder body and connected with the cylinder body through a pipeline and used for dissipating heat in the cylinder body.
Specifically, the cylinder body is not limited to a specific structure, and can be made of cast iron or aluminum alloy to form a closed structure, so that only parts such as a piston, a valve and a crankshaft can be accommodated, a combustion chamber of the engine is formed, chemical energy is finally converted into mechanical energy, and the forward driving function is realized, and the details are omitted.
Specifically, the specific structure of the exhaust unit is not limited, and the exhaust unit only needs to be capable of discharging exhaust gas generated after the combustion of the engine from the engine, which is the prior art and is not repeated.
Specifically, the specific structure of the detection device is not limited, the detection device can be a combined structure of the sensor and the data transmission module, the data transmission module transmits the acquired data detected by the sensor to the central control processor, and the detection device can only complete the function of detecting the corresponding data and transmitting the corresponding data to the central control processor.
Specifically, the specific form of the central control processor is not limited, and the central control processor can be an external computer, wherein each unit is different functional programs in the computer, only the functions of data processing and data exchange can be completed, and the central control processor is the prior art and is not described in detail.
Specifically, the specific connection mode of each unit in the central control processor, the power device and the detection device is not limited, communication connection between each unit and each acquisition unit arranged in the detection device and the control system of the power device is only required to be completed, and the functions of acquiring data detected by each acquisition unit and controlling the valve opening of the air inlet unit are realized.
Specifically, the analysis unit generates an idle speed change curve based on the rotation speed value, wherein,
and the analysis unit takes time as an X axis, takes the rotating speed value as a Y axis to construct a rectangular coordinate system, and constructs the idling change curve in the rectangular coordinate system.
In particular, the evaluation unit determines a fluctuation variable of the idle speed profile, wherein,
the analysis unit constructs a plurality of straight lines parallel to the Y axis and equal in distance in the rectangular coordinate system to divide the idle speed change curve into a plurality of idle speed change curve segments, determines the slope K of the midpoint of each idle speed change curve segment, calculates the fluctuation parameter delta K of the idle speed change curve according to a formula (1),
in the formula (1), K i+1 Represents the slope, K, of the midpoint of the i+1st idle speed change curve segment i Represents the slope of the midpoint of the ith idle speed change curve segment, n represents the number of idle speed change curve segments, and i represents an integer greater than 0.
Specifically, the analysis unit determines an idle state of the vehicle based on the idle speed change curve, wherein the analysis unit determines the idle state of the vehicle based on the idle speed change curve, wherein,
the analysis unit compares the fluctuation parameter with a preset slope comparison interval, the midpoint of the slope comparison interval is 0,
under the first slope comparison condition, the analysis unit judges that the idle state of the automobile is a first idle state;
under the second slope comparison condition, the analysis unit judges that the idle state of the automobile is a second idle state;
the first slope comparison condition is that the fluctuation parameter is in the preset slope comparison interval, the absolute value of the fluctuation parameter is larger than a preset stability index threshold, the second slope comparison condition is that the fluctuation parameter is not in the preset slope comparison interval, the stability index threshold is determined based on the interval upper limit of the slope comparison interval, and the interval upper limit of the stability index threshold is set to be 0.2 times.
Specifically, in this embodiment, the upper limit and the lower limit of the preset slope comparison interval are determined based on the fluctuation parameter Δk of the idle speed change curve measured during several periods of stable idle speed operation of the engine in the experimental state, the lower limit Δk1= -1.2|Δk0|, and the upper limit Δk2=1.2|Δk0|.
Specifically, in the invention, an idle speed change curve is generated by an analysis unit based on a rotating speed value, and the idle speed state of an automobile is judged based on the idle speed change curve, wherein the idle speed change curve is a curve formed by the change of the rotating speed value of an automobile engine along with time, in the actual situation, the idle speed of the automobile engine is in a normal range but has the unstable condition of fluctuation up and down, often, the fluctuation parameter of the idle speed change curve is in a stable section, in the abnormal situation, the fluctuation of the rotating speed can have larger fluctuation in a certain period, and in different fluctuation situations, the main factors influencing the idle speed also have partial difference.
Specifically, the first control unit adjusts the valve opening of the air inlet unit in real time based on the air flow value until the air flow value is within a preset reasonable flow interval, wherein,
the first control unit compares the air flow value Q with preset reasonable flow intervals Q1 and Q2 in real time, Q1 is more than 0 and Q2 is less than 0,
the first control unit reduces the valve opening of the air inlet unit under a first flow rate comparison condition;
under a second flow rate comparison condition, the first control unit increases the valve opening of the air inlet unit;
wherein the first flow rate comparison condition is Q & gtQ 2, and the second flow rate comparison condition is Q & ltQ 1.
Specifically, the lower limit Q1 of the reasonable flow rate interval and the upper limit Q2 of the reasonable flow rate interval are determined based on the average value Q0 of the air flow rate values of the engine in the steady operation under the experimental environment, and q1= 0.8Q0 and q2= 1.2Q0 are set.
In the invention, the first control unit adjusts the valve opening of the air inlet unit based on the air flow value in real time when in the first idle state until the air flow value is in a preset reasonable flow interval, and in the actual situation, in the first idle state that the idle speed of the automobile engine fluctuates up and down but the fluctuation amount is smaller, the valve opening of the air inlet unit can be properly adjusted based on the air flow only, so that the shaking is reduced, and the riding comfort is improved.
Specifically, in the invention, the first control unit adjusts the valve opening of the air inlet unit in real time based on the air flow value in the first idle state until the air flow value is in a preset reasonable flow interval, in the actual situation, in the first idle state that the idle speed of the automobile engine is in a normal range but has unstable condition of fluctuation up and down, the main factor influencing the idle speed stability of the automobile engine is the air flow entering the engine cylinder, if the air flow entering the engine cylinder is insufficient, the engine can generate a choking phenomenon, insufficient combustion, unstable idle speed and even flameout, at the moment, the valve opening is increased to improve the air flow, if the air flow is excessive, the engine can generate a flooding phenomenon, excessive combustion can also cause the unstable idle speed, and at the moment, the valve opening is reduced to reduce the air flow, therefore, in the first idle state, the valve opening of the air inlet unit can be reliably adjusted according to the air flow value, and the efficiency and effect of adjusting the idle speed of the automobile engine are improved.
In particular, the second control unit calculates an intake characteristic parameter based on an intake parameter, wherein,
the second control unit determines the intake parameter, calculates an intake characteristic parameter E according to formula (2),
in the formula (2), P represents an air pressure value, T represents an air temperature value, Q represents an air flow value, P0 represents a preset pressure comparison parameter, P0 > 0, T0 represents a preset temperature comparison parameter, T0 > 0, Q0 represents a preset flow comparison parameter, and Q0 > 0.
Specifically, in the present embodiment, P0, T0, and Q0 are the average value of the air pressure values, the average value of the air temperature values, and the average value of the air flow values measured when the engine is in a steady operation state in an experimental state, respectively.
In particular, the second control unit adjusts a valve opening of the intake unit based on the intake characteristic parameter, wherein,
under a first preset condition, reducing the valve opening, wherein the reduction is positively correlated with the air inlet characteristic parameter;
under a second preset condition, increasing the valve opening, wherein the increasing amount is inversely related to the air inlet characteristic parameter;
the first preset condition is that the fluctuation parameter of the idle speed change curve is a positive value, and the second preset condition is that the fluctuation parameter of the idle speed change curve is a negative value.
In particular, the second control unit decreases the valve opening by a positive correlation with the intake characteristic parameter, wherein,
the second control unit compares the air intake characteristic parameter E with a preset first parameter comparison threshold E1 and a second parameter comparison threshold E2, E1 is more than 0 and less than E2,
under the comparison result of the first parameter, the second control unit judges that the reduction amount of the valve opening of the air inlet unit is a preset first valve opening reduction parameter o 11 ；
Under the comparison result of the second parameter, the second control unit judges that the reduction amount of the valve opening of the air inlet unit is a preset second valve opening reduction parameter o 12 ；
Under the comparison result of the third parameter, the second control unit judges that the reduction amount of the valve opening of the air inlet unit is a preset third valve opening reduction parameter o 13 ；
Wherein, the first parameter comparison result is E more than or equal to E2, the second parameter comparison result is E1 more than or equal to E < E2, and the third parameter comparison result is E < E1, 10% > o 11 ＞o 12 ＞o 13 。
Specifically, the second control unit increases the valve opening by an amount inversely correlated with the intake characteristic parameter;
the third control unit compares the air intake characteristic parameter E with a preset third parameter comparison threshold E3 and a fourth parameter comparison threshold E4, E3 is more than 0 and less than E4 and E1 is more than 0,
under the comparison result of the fourth parameter, the second control unit judges that the increase of the valve opening of the air inlet unit is a preset first valve opening increase parameter o 21 ；
Under the fifth parameter comparison result, the second control unit judges that the reduction amount of the valve opening of the air inlet unit is a preset second valve opening increase parameter o 22 ；
Comparison of results at the sixth parameterThe second control unit determines that the amount of decrease in the valve opening of the intake unit is a preset third valve opening increase parameter o 23 ；
Wherein, the fourth parameter comparison result is E4 or more, the fifth parameter comparison result is E3 or less and E4 or less, and the sixth parameter comparison result is E3 or less and o 21 ＜o 22 ＜o 23 ＜10％。
Specifically, the first parameter comparison threshold E1, the second parameter comparison threshold E2, the third parameter comparison threshold E3, and the fourth parameter comparison threshold E4 are calculated based on an average value E0 of intake characteristic parameters during a plurality of time periods when the engine is in a steady running state under experimental conditions, and e1= 1.2E0, e2= 1.4E0, e3= 0.6E0, and e4= 0.8E0 are set.
Specifically, one skilled in the art can set o11 to o13 and o21 to o23 within a limited interval, control the difference ratio F to be within 0.3 when setting, and avoid excessive difference when guaranteeing differentiation, set f= (o) 1，i+1 -o 1，i )/o 1，i ，F＝(o 2，i+1 -o 2，i )/o 2，i Wherein o 1，i Represents an i-th valve opening degree reduction parameter, o 1，i+1 Represents the i+1th valve opening degree reduction parameter, o 2，i Represents an i-th valve opening degree increase parameter, o 2，i+1 The i+1th valve opening degree increase parameter is indicated.
In the invention, the second control unit calculates an air inlet characteristic parameter based on an air inlet parameter in a second idle state, adjusts the valve opening of the air inlet unit based on the air inlet characteristic parameter, judges whether the injection flow of the fuel injector needs to be adjusted based on the change condition of the oxygen concentration value after the valve opening is adjusted, and determines whether the air inlet valve opening of the air inlet unit according to the change condition of the oxygen concentration value after the valve opening is adjusted, wherein the main factors influencing the idle speed stability of the automobile engine are the air flow entering the engine cylinder, and other factors, including the air flow, the air pressure and the air temperature, of course, when the parameters are abnormal, the engine can generate a choking phenomenon, because the engine control system needs to keep a proper air-fuel ratio (the proportion of air and fuel) when the parameters are abnormal, the air inlet characteristic parameter is abnormal, the air-fuel ratio is caused to be higher, so that the combustion of the engine is unstable, the abnormal condition is mainly caused by the valve abnormality and the abnormal fuel injection quantity, the valve opening of the air inlet unit is determined according to the adjustment quantity of the air inlet characteristic parameter, and the oxygen concentration contrast interval is determined according to the adjustment quantity, if the change condition of the oxygen concentration after the valve opening is adjusted is not in accordance with a preset standard, the fuel injection quantity is insufficient or more, if the oxygen concentration is not in accordance with the change condition of the oxygen concentration after the valve opening is adjusted, and when the valve opening is more than the valve opening is adjusted, the oxygen concentration is adjusted, the oxygen is corresponding to the oxygen concentration is adjusted to the air injection valve opening is sufficient, and the oxygen is adjusted to the air injection valve is compared with the abnormal value after the valve opening, and the change condition is corresponding to the valve opening, and the change value is corresponding to the oxygen valve opening and has high contrast value, the reliability and efficiency of suppressing the engine idling abnormality are improved.
Specifically, the second control unit determines whether or not the adjustment of the injection flow rate of the fuel injector is required based on the change in the oxygen concentration value after the adjustment of the valve opening degree, wherein,
comparing the oxygen concentration value with a preset oxygen concentration comparison interval;
and if the oxygen concentration value does not belong to the oxygen concentration comparison section, judging that the injection flow of the fuel injector needs to be adjusted, including increasing the injection flow of the fuel injector or decreasing the injection flow of the fuel injector.
The amount of increase and decrease in increasing or decreasing the injection flow of the fuel injector may be defined by those skilled in the art as desired and will not be described in detail herein.
In this embodiment, the oxygen concentration comparison interval is determined based on the adjustment amount of the valve opening, and the central control processor stores the oxygen concentration comparison interval corresponding to the oxygen concentration value when the valve opening is adjusted by different adjustment amounts in the normal running state of the engine, where the data are measured under the experimental condition and stored in the central control processor.
Specifically, the second control means controls the valve opening to return to the initial opening when it is determined to adjust the injection flow rate of the fuel injector.
Specifically, the air inlet unit comprises an air inlet pipe, a valve arranged in the air inlet pipe and an oil injection injector, wherein the opening degree of the valve can be adjusted, and the injection flow rate of the oil injection injector can be adjusted.
Thus far, the technical solution of the present invention has been described in connection with the preferred embodiments shown in the drawings, but it is easily understood by those skilled in the art that the scope of protection of the present invention is not limited to these specific embodiments. Equivalent modifications and substitutions for related technical features may be made by those skilled in the art without departing from the principles of the present invention, and such modifications and substitutions will be within the scope of the present invention.
Claims (10)
1. A detection control system for idle speed of an automobile engine, comprising:
the power device comprises a cylinder body, an air inlet unit arranged at the top of the cylinder body and used for introducing air into the cylinder body, an exhaust unit arranged at the bottom of the cylinder body and used for exhausting combusted waste gas, and a rotating unit arranged inside the cylinder body and used for outputting power;
the detection device comprises an oxygen concentration acquisition unit, a rotating speed acquisition unit, an air pressure acquisition unit, an air temperature acquisition unit and an air flow acquisition unit, wherein the oxygen concentration acquisition unit is arranged on the exhaust unit and used for detecting the oxygen concentration value in exhaust gas of the cylinder body;
a central control processor, which comprises an analysis unit, a first control unit and a second control unit which are connected with each other,
the analysis unit is connected with the detection device and is used for generating an idle speed change curve based on the rotating speed value and judging the idle speed state of the automobile based on the idle speed change curve, wherein the idle speed state comprises a first idle speed state and a second idle speed state;
the first control unit is connected with the power device and the detection device and is used for adjusting the valve opening of the air inlet unit based on the air flow value in real time when the analysis unit judges that the idle state of the automobile is a first idle state until the air flow value is in a preset reasonable flow interval;
the second control unit is connected with the power device and the detection device, and is used for calculating an air inlet characteristic parameter based on an air inlet parameter when the analysis unit judges that the idle state of the automobile is the second idle state, adjusting the valve opening of the air inlet unit based on the air inlet characteristic parameter, judging whether the injection flow of the fuel injector needs to be adjusted based on the change condition of the oxygen concentration value after the valve opening is adjusted, wherein the air inlet parameter comprises an air pressure value, an air temperature value and an air flow value.
2. The system according to claim 1, wherein the analysis unit generates an idle speed change curve based on the rotation speed value, wherein,
and the analysis unit takes time as an X axis, takes the rotating speed value as a Y axis to construct a rectangular coordinate system, and constructs the idling change curve in the rectangular coordinate system.
3. The system for detecting and controlling the idling speed of an automobile engine according to claim 2, wherein the analysis unit determines a fluctuation parameter of the idling speed change curve, wherein,
the analysis unit constructs a plurality of straight lines parallel to the Y axis and equal in distance in the rectangular coordinate system to divide the idle speed change curve into a plurality of idle speed change curve segments, determines the slope K of the midpoint of each idle speed change curve segment, calculates the fluctuation parameter delta K of the idle speed change curve according to a formula (1),
in the formula (1), K i+1 Represents the slope, K, of the midpoint of the i+1st idle speed change curve segment i Represents the slope of the midpoint of the ith idle speed change curve segment, n represents the number of idle speed change curve segments, and i represents an integer greater than 0.
4. The system for detecting and controlling the idling of an engine of a motor vehicle according to claim 3, wherein the analysis unit determines the idling state of the motor vehicle based on the idling change curve, wherein,
the analysis unit compares the fluctuation parameter with a preset slope comparison interval, the midpoint of the slope comparison interval is 0,
under the first slope comparison condition, the analysis unit judges that the idle state of the automobile is a first idle state;
under the second slope comparison condition, the analysis unit judges that the idle state of the automobile is a second idle state;
the first slope comparison condition is that the fluctuation parameter is in the preset slope comparison interval, the absolute value of the fluctuation parameter is larger than a preset stability index threshold, the second slope comparison condition is that the fluctuation parameter is not in the preset slope comparison interval, and the stability index threshold is determined based on the upper limit of the slope comparison interval.
5. The system according to claim 4, wherein the first control unit adjusts the valve opening of the intake unit based on the air flow value in real time until the air flow value is within a preset reasonable flow interval, wherein,
the first control unit compares the air flow value with a preset reasonable flow interval in real time,
the first control unit reduces the valve opening of the air inlet unit under a first flow rate comparison condition;
under a second flow rate comparison condition, the first control unit increases the valve opening of the air inlet unit;
the first flow rate comparison condition is that the air flow rate value is larger than the upper limit of the reasonable flow rate interval, and the second flow rate comparison condition is that the air flow rate value is smaller than the lower limit of the reasonable flow rate interval.
6. The system according to claim 1, wherein the second control unit calculates an intake characteristic parameter based on an intake parameter, wherein,
the second control unit determines the intake parameter, calculates an intake characteristic parameter E according to formula (2),
in the formula (2), P represents an air pressure value, T represents an air temperature value, Q represents an air flow value, P0 represents a preset pressure comparison parameter, T0 represents a preset temperature comparison parameter, and Q0 represents a preset flow comparison parameter.
7. The system according to claim 6, wherein the second control unit adjusts a valve opening degree of the intake unit based on the intake characteristic parameter, wherein,
under a first preset condition, reducing the valve opening, wherein the reduction is positively correlated with the air inlet characteristic parameter;
under a second preset condition, increasing the valve opening, wherein the increasing amount is inversely related to the air inlet characteristic parameter;
the first preset condition is that the fluctuation parameter of the idle speed change curve is a positive value, and the second preset condition is that the fluctuation parameter of the idle speed change curve is a negative value.
8. The system according to claim 7, wherein the second control unit determines whether or not adjustment of the injection flow rate of the fuel injector is required based on a change in the oxygen concentration value after adjustment of the valve opening degree, wherein,
comparing the oxygen concentration value with a preset oxygen concentration comparison interval;
and if the oxygen concentration value does not belong to the oxygen concentration comparison section, judging that the injection flow of the fuel injector needs to be adjusted, including increasing the injection flow of the fuel injector or decreasing the injection flow of the fuel injector.
9. The system according to claim 8, wherein the second control unit determines that the valve opening degree is controlled to be returned to the initial opening degree when the injection flow rate of the fuel injector is adjusted.
10. The system according to claim 1, wherein the intake unit includes an intake pipe, a valve provided in the intake pipe, the valve being capable of adjusting an opening degree, and an oil jet injector capable of adjusting an injection flow rate.
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| CN202310694088.0A CN116733649A (en) | 2023-06-12 | 2023-06-12 | Detection control system for idle speed of automobile engine |
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| CN202310694088.0A CN116733649A (en) | 2023-06-12 | 2023-06-12 | Detection control system for idle speed of automobile engine |
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| CN202310694088.0A Pending CN116733649A (en) | 2023-06-12 | 2023-06-12 | Detection control system for idle speed of automobile engine |
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