CN107654301B - Temperature control method and device for engine exhaust manifold - Google Patents
Temperature control method and device for engine exhaust manifold Download PDFInfo
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- CN107654301B CN107654301B CN201610590078.2A CN201610590078A CN107654301B CN 107654301 B CN107654301 B CN 107654301B CN 201610590078 A CN201610590078 A CN 201610590078A CN 107654301 B CN107654301 B CN 107654301B
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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
- F02D41/021—Introducing corrections for particular conditions exterior to the engine
- F02D41/0235—Introducing corrections for particular conditions exterior to the engine in relation with the state of the exhaust gas treating apparatus
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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
- F02D41/021—Introducing corrections for particular conditions exterior to the engine
- F02D41/0235—Introducing corrections for particular conditions exterior to the engine in relation with the state of the exhaust gas treating apparatus
- F02D2041/0265—Introducing corrections for particular conditions exterior to the engine in relation with the state of the exhaust gas treating apparatus to decrease temperature of the exhaust gas treating apparatus
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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
- F02D2200/00—Input parameters for engine control
- F02D2200/02—Input parameters for engine control the parameters being related to the engine
- F02D2200/08—Exhaust gas treatment apparatus parameters
- F02D2200/0802—Temperature of the exhaust gas treatment apparatus
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/40—Engine management systems
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- 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)
- Combined Controls Of Internal Combustion Engines (AREA)
Abstract
The invention discloses a temperature control method and a temperature control device for an engine exhaust manifold, wherein the method comprises the following steps: acquiring the current temperature of an exhaust manifold of an engine, determining a first frequency according to the current temperature and a target temperature, and outputting a first step size at the first frequency, wherein the first frequency is positively correlated with the difference between the current temperature and the target temperature; and accumulating the first step length to a first current injection coefficient to adjust the temperature of the exhaust manifold of the engine each time the first step length is output, wherein the first current injection coefficient is the injection coefficient when the first step length is output, and the injection coefficient is used for controlling the injection quantity. The method and the device can improve the control effect of the temperature control of the engine exhaust manifold.
Description
Technical Field
The invention relates to the field of control, in particular to a temperature control method and device for an engine exhaust manifold.
Background
In many scenarios, it is necessary to control the temperature of the exhaust manifold of the engine, for example, during calibration of the engine, the temperature of the exhaust manifold of the engine needs to be monitored, and the temperature of the exhaust manifold of the engine needs to be controlled below a safe temperature, so as to prevent the exhaust manifold and a catalyst from being damaged due to high temperature.
The control effect of the existing temperature control mode of the engine exhaust manifold is to be optimized.
Disclosure of Invention
The invention aims to improve the control effect of temperature control of an engine exhaust manifold.
In order to solve the above technical problem, an embodiment of the present invention provides a method for controlling a temperature of an engine exhaust manifold, including: acquiring the current temperature of an exhaust manifold of an engine, determining a first frequency according to the current temperature and a target temperature, and outputting a first step size at the first frequency, wherein the first frequency is positively correlated with the difference between the current temperature and the target temperature; and accumulating the first step length to a first current injection coefficient to adjust the temperature of the exhaust manifold of the engine each time the first step length is output, wherein the first current injection coefficient is the injection coefficient when the first step length is output, and the injection coefficient is used for controlling the injection quantity.
Optionally, the method for controlling the temperature of the exhaust manifold of the engine further comprises: when the current temperature is lower than the target temperature and the temperature difference between the current temperature and the target temperature is within a first range, judging the rising rate of the current temperature; when the rising rate of the current temperature exceeds a first reference value, outputting a second step length; summing the second step length and a second current oil injection coefficient to obtain a second oil injection coefficient, and controlling the oil injection quantity according to the second oil injection coefficient so as to limit the rising rate of the temperature of the exhaust manifold of the engine; wherein the second fuel injection coefficient is greater in value than the second current fuel injection coefficient, which is the fuel injection coefficient at which the second step is output.
Optionally, the method for controlling the temperature of the exhaust manifold of the engine further comprises: outputting a third step length when the current temperature is lower than the target temperature and the temperature difference with the target temperature is within a second range; summing a third current oil injection coefficient and the third step length to obtain a third oil injection coefficient, and controlling the oil injection quantity according to the third oil injection coefficient; wherein the third current fuel injection coefficient is a fuel injection coefficient at which the third step is output, and a value of the third fuel injection coefficient is smaller than the third current fuel injection coefficient.
Optionally, determining a first frequency according to the current temperature and the target temperature, and outputting a first step size at the first frequency includes: generating variable step length according to the temperature difference between the current temperature and the target temperature, wherein different temperature difference ranges correspond to different numerical values of the variable step length; and outputting the first step size according to the first frequency determined by the variable step size.
Optionally, the outputting the first step size according to the first frequency determined by the variable step size includes: when the numerical value of the variable step length is not updated, a first parameter is used as a divisor to carry out remainder on the accumulated value of the variable step length, and if the remainder is less than or equal to the numerical value of the variable step length, the first step length is output once; the accumulated value of the variable step length is obtained by accumulating one variable step length for the accumulated value of the variable step length after the first step length is output every time, and when the accumulated value of the variable step length is left by taking a first parameter as a divisor for the first time, the initial numerical value of the accumulated value of the variable step length is equal to the numerical value of the variable step length; the first parameter is of a greater order of magnitude than the variable step size.
An embodiment of the present invention further provides a temperature control device for an engine exhaust manifold, including: the device comprises a first step size unit, a second step size unit and a third step size unit, wherein the first step size unit is suitable for acquiring the current temperature of an exhaust manifold of the engine, determining a first frequency according to the current temperature and a target temperature, and outputting a first step size at the first frequency, and the first frequency is positively correlated with the difference value of the current temperature and the target temperature; and the first injection coefficient unit is suitable for accumulating the first step length to a first current injection coefficient to adjust the temperature of the exhaust manifold of the engine every time the first step length is output, wherein the first current injection coefficient is the injection coefficient when the first step length is output, and the injection coefficient is used for controlling the injection quantity.
Optionally, the temperature control apparatus of an engine exhaust manifold further comprises an enrichment unit, the enrichment unit comprising: a temperature increase rate judgment subunit adapted to judge an increase rate of the current temperature when the current temperature is lower than the target temperature and a temperature difference from the target temperature is within a first range; a second step output subunit adapted to output a second step when the rate of increase of the current temperature exceeds a first reference value; the second oil injection coefficient subunit is suitable for summing the second step length and a second current oil injection coefficient to obtain a second oil injection coefficient, and controlling the oil injection quantity according to the second oil injection coefficient to limit the rising rate of the temperature of the exhaust manifold of the engine; wherein the second fuel injection coefficient is greater in value than the second current fuel injection coefficient, which is the fuel injection coefficient at which the second step is output.
Optionally, the temperature control device of the engine exhaust manifold further comprises: a derating unit, the derating unit comprising: a third step output unit adapted to output a third step when the current temperature is lower than the target temperature and a temperature difference from the target temperature is within a second range; the third oil injection coefficient unit is suitable for summing a third current oil injection coefficient and the third step length to obtain a third oil injection coefficient, and the oil injection quantity is controlled according to the third oil injection coefficient; wherein the third current fuel injection coefficient is a fuel injection coefficient at which the third step is output, and a value of the third fuel injection coefficient is smaller than the third current fuel injection coefficient.
Optionally, the first step length unit includes: the variable step length subunit is suitable for generating a variable step length according to the temperature difference between the current temperature and the target temperature, and different temperature difference ranges correspond to different numerical values of the variable step length; and the first step length subunit is suitable for outputting the first step length according to the first frequency determined by the variable step length.
Optionally, the first step length subunit is adapted to, when the numerical value of the variable step length is not changed, take a remainder of the accumulated value of the variable step length by using a first parameter as a divisor, and output the first step length once if the remainder is less than or equal to the numerical value of the variable step length; the accumulated value of the variable step length is obtained by accumulating one variable step length for the accumulated value of the variable step length after the first step length is output every time, and when the accumulated value of the variable step length is left by taking a first parameter as a divisor for the first time, the initial numerical value of the accumulated value of the variable step length is equal to the numerical value of the variable step length; the first parameter is of a greater order of magnitude than the variable step size.
Compared with the prior art, the technical scheme of the embodiment of the invention has the following beneficial effects:
determining a first frequency according to the current temperature of an engine exhaust manifold, outputting a first step length at the first frequency, accumulating the first step length to a first current oil injection coefficient when the first step length is output every time, wherein the oil injection coefficient is used for controlling the oil injection quantity, and the temperature of the engine exhaust manifold can be adjusted by adjusting the oil injection quantity, so that the oil injection quantity can adapt to the requirement of current temperature adjustment, and the temperature control of the engine exhaust manifold is further realized.
Further, when the current temperature is lower than the target temperature and the temperature difference between the current temperature and the target temperature is within a first range, judging the rising rate of the current temperature, when the rising rate of the current temperature exceeds a first reference value, outputting a second step length, summing the second step length and a second current oil injection coefficient to obtain a second oil injection coefficient, wherein the value of the second oil injection coefficient is greater than the second current oil injection coefficient, so that the oil injection quantity can be increased when the rising rate of the current temperature of an engine exhaust manifold is greater, the rising rate of the engine exhaust manifold temperature can be limited, and the effective control of the engine exhaust manifold temperature can be realized.
Further, when the current temperature is lower than the target temperature and the temperature difference with the target temperature is within a second range, outputting a third step length; and summing the third current oil injection coefficient and the third step length to obtain a third oil injection coefficient, and controlling the oil injection quantity according to the third oil injection coefficient, wherein the value of the third oil injection coefficient is smaller than the third current oil injection coefficient, so that the oil injection quantity can be quickly reduced when the current temperature is lower, the temperature of an exhaust manifold of the engine is prevented from being too low, and the effective control on the temperature of the exhaust manifold of the engine is realized.
Drawings
FIG. 1 is a flow chart of a method of controlling the temperature of an engine exhaust manifold in accordance with an embodiment of the present invention;
FIG. 2 is a detailed flowchart of step S11 in FIG. 1;
FIG. 3 is a partial flow chart of a method of controlling the temperature of an engine exhaust manifold in accordance with an embodiment of the present invention;
FIG. 4 is a partial flow chart of a method of controlling the temperature of an engine exhaust manifold in accordance with an embodiment of the present invention;
FIG. 5 is a schematic structural view of a temperature control device of an exhaust manifold of an engine according to an embodiment of the present invention;
FIG. 6 is a schematic diagram of an enrichment unit according to an embodiment of the present invention;
FIG. 7 is a schematic diagram of a structure of a thinning unit according to an embodiment of the present invention;
FIG. 8 is a schematic structural diagram of a first step size unit according to an embodiment of the present invention;
FIG. 9 illustrates an implementation of a temperature control device for an engine exhaust manifold in an embodiment of the present invention;
FIG. 10 illustrates a specific implementation of a first step element in an embodiment of the invention;
FIG. 11 is a graph showing the relationship between the variable step size, the first step size and the fuel injection coefficient according to the embodiment of the present invention;
FIG. 12 illustrates a specific implementation of a second step component in an embodiment of the invention;
FIG. 13 is a schematic diagram illustrating the effect of the method and apparatus for controlling the exhaust manifold of an engine according to the present invention.
Detailed Description
As described above, in many scenarios, it is necessary to control the temperature of the exhaust manifold of the engine, for example, during calibration of the engine, the temperature of the exhaust manifold of the engine needs to be monitored, and the temperature of the exhaust manifold of the engine needs to be controlled below a safe temperature, so as to prevent the exhaust manifold and the catalyst from being damaged due to high temperature.
In the existing temperature control method for the engine exhaust manifold, the fuel injection quantity of the engine is usually manually controlled, and due to the limitation of the fuel injection quantity and the air ratio, when the fuel injection quantity is more than the combustible fuel injection quantity, the temperature of the engine exhaust manifold is reduced, so that the temperature of the engine exhaust manifold can be controlled below a safe temperature by increasing the fuel injection quantity.
However, this control method requires manual real-time monitoring, and in some scenarios, for example, during engine calibration, a slight change in calibration parameters (for example, when the ignition angle changes by 0.75 degrees) may cause a sharp rise in the temperature of the engine exhaust manifold, whereas the conventional manual control of the speed is not good enough to cope with the rapidly rising engine exhaust manifold temperature, and the temperature of the engine exhaust manifold cannot be effectively controlled, which may cause the engine to suddenly stop because the exhaust manifold temperature exceeds a safe temperature. Sudden engine shutdown may have a number of consequences, such as suspension of calibration if the engine is suddenly shut down during calibration, which may affect the efficiency of calibration.
According to the embodiment of the invention, a first frequency is determined according to the current temperature of the exhaust manifold of the engine, a first step length is output at the first frequency, the first step length is accumulated to a first current oil injection coefficient when the first step length is output every time, the oil injection coefficient is used for controlling the oil injection quantity, and the temperature of the exhaust manifold of the engine can be adjusted by adjusting the oil injection quantity, so that the oil injection quantity can adapt to the requirement of current temperature adjustment, and the temperature control of the exhaust manifold of the engine is further realized.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below.
FIG. 1 is a flow chart of a method of controlling the temperature of an engine exhaust manifold in accordance with an embodiment of the present invention.
In step S11, a current temperature of an exhaust manifold of an engine is obtained, a first frequency is determined according to the current temperature and a target temperature, and a first step is output at the first frequency, wherein the first frequency is positively correlated with a difference between the current temperature and the target temperature.
The current temperature of the engine exhaust manifold may be the engine exhaust manifold temperature at the time of measurement, and in implementations, the current temperature of the engine exhaust manifold may be obtained through some interface. For example, it may be obtained through an interface of automatic measurement software during calibration. The timing of acquiring the current temperature of the engine exhaust manifold may be determined as needed, for example, the temperature of the engine exhaust manifold may be detected at fixed time intervals; the timing of determining the first frequency from the current temperature and the target temperature may also be determined as desired.
In the calibration process, the first step length can be an empirical value obtained through experiments and is matched with engines of different brands and different models, the temperature of an exhaust manifold of the engine can be rapidly controlled through the appropriate first step length, and the condition that the adjustment amplitude is too large due to too long step length is avoided; the absolute value of the first step size may be fixed for the same make and model of engine, and its positive and negative may be determined according to the current temperature and the target temperature of the engine.
The first frequency is determined according to the current temperature of the exhaust manifold of the engine, the first step length is output according to the first frequency, the oil injection coefficient can be controlled by controlling the output frequency of the first step length, and then the temperature of the exhaust manifold of the engine is controlled. The first step length is output in a discrete mode, the oil injection coefficient can be kept unchanged in the interval of two times of first step length output, at the moment, if the current temperature of the exhaust manifold of the engine is obtained again, the first frequency can be recalculated, and then the flexible control on the oil injection quantity can be realized, so that excessive oil injection can be avoided, and the oil consumption is reduced.
In the calibration process, the automatic measurement software can be used for communicating with an engine rack operating system and an engine application system, reading an engine exhaust manifold temperature signal of the rack system, outputting a first step length at a first frequency by combining a target temperature of the engine exhaust manifold temperature, adjusting a current oil injection coefficient and further adjusting the temperature of the engine exhaust manifold. The acquisition time of the current temperature can be set through automatic measurement software, and the first frequency is updated after a new current temperature is acquired every time, so that closed-loop control on the temperature of an exhaust manifold of the engine is formed.
Referring to fig. 2, in a specific implementation, step S11 in fig. 1 may include:
and step S21, generating variable step length according to the temperature difference between the current temperature and the target temperature, wherein different temperature difference ranges correspond to different numerical values of the variable step length.
Step S22, outputting the first step size according to the first frequency determined by the variable step size.
In a specific implementation, when the numerical value of the variable step size is not updated, a first parameter is used as a divisor to carry out remainder on the accumulated value of the variable step size, and if the remainder is less than or equal to the numerical value of the variable step size, the first step size is output once.
The update timing of the variable step length can be determined according to needs, for example, the update timing can be set to be fixed time, or the update timing can be updated when the current temperature triggers a preset condition, or other update rules are set to meet the effective control of the temperature of the exhaust manifold of the engine.
The accumulated value of the variable step length is obtained by accumulating one variable step length for the accumulated value of the variable step length after the first step length is output every time, and when the accumulated value of the variable step length is left by taking a first parameter as a divisor for the first time, the initial numerical value of the accumulated value of the variable step length is equal to the numerical value of the variable step length; the first parameter is of a greater order of magnitude than the variable step size.
The variable step size is adapted to the first parameter and may be different for different engines to generate a first frequency suitable for different engines.
It can be seen that the larger the variable step size, the larger the value of the first frequency; the variable step length corresponds to different temperature difference ranges, and the larger the temperature difference range is, the larger the variable step length is; therefore, when the temperature difference range is large, the first step length can be output at a high frequency value, and the fuel injection quantity can be increased quickly.
With continued reference to FIG. 1, in step S12, each time the first step size is output, the first step size is accumulated to a first current injection coefficient to adjust the temperature of the engine exhaust manifold.
Wherein the first current fuel injection coefficient is a fuel injection coefficient at the time when the first step is output, the fuel injection coefficient being used to control a fuel injection amount.
And when the first step length is output, the engine controls the fuel injection quantity according to the first current fuel injection coefficient. And accumulating the first step length to a first current fuel injection coefficient to adjust the temperature of the exhaust manifold of the engine each time the first step length is output, wherein the temperature of the exhaust manifold of the engine can be adjusted by accumulating the first step length to the first current fuel injection coefficient because the first frequency is positively correlated with the difference value between the current temperature and the target temperature and the value of the first step length can be positive or negative, and finally the temperature of the exhaust manifold of the engine tends to be stable.
Referring to FIG. 3, in an implementation, a method of controlling temperature of an engine exhaust manifold may further include:
and step S31, when the current temperature is lower than the target temperature and the temperature difference between the current temperature and the target temperature is within a first range, judging the rising rate of the current temperature.
When the temperature difference between the current temperature and the target temperature is within a first range, if the current temperature has a high increase rate, if the fuel injection quantity is controlled by only a second current coefficient, the increase of the temperature of the engine exhaust manifold is probably not effectively inhibited, so that the temperature of the engine exhaust manifold breaks through the target temperature in a very short time, and therefore, when the temperature difference between the current temperature and the target temperature is within the first range, the increase rate of the current temperature needs to be judged, and the judgment result is responded.
The first range may be set as needed or may be an empirical value obtained through experiments, and may be different for different engines.
And step S32, outputting a second step size when the rising rate of the current temperature exceeds a first reference value.
In one embodiment, the second step size may be a larger step size, which is a positive value with an absolute value greater than the first step size. Similarly, the second step size may be different for different engines to effectively limit the rate of rise of the manifold temperature for different engines; the second step size may be obtained from experimental data.
And step S33, summing the second step length and a second current oil injection coefficient to obtain a second oil injection coefficient, and controlling the oil injection quantity according to the second oil injection coefficient to limit the rising rate of the temperature of the exhaust manifold of the engine.
Wherein the second fuel injection coefficient is greater in value than the second current fuel injection coefficient, which is the fuel injection coefficient at which the second step is output.
And the value of the second oil injection coefficient is greater than the second current oil injection coefficient, the second oil injection coefficient is obtained by summing the second step length and the second current oil injection coefficient, and the oil injection quantity is controlled and increased by the second oil injection coefficient, so that the condition that the temperature of an exhaust manifold of the engine rises too fast can be avoided.
Steps S31 through S33 may be performed in parallel with steps S11 and S12 of fig. 1 to effectively control the temperature of the engine exhaust manifold.
Referring to FIG. 4, in an implementation, a method of controlling temperature of an engine exhaust manifold may further include:
and step S41, outputting a third step when the current temperature is lower than the target temperature and the temperature difference with the target temperature is in a second range.
When the current temperature is lower than the target temperature and the temperature difference between the current temperature and the target temperature is within a second range, the temperature of the exhaust manifold of the engine is lower, and a third larger step length is output at the moment to rapidly reduce the oil injection coefficient and further reduce the oil injection quantity, so that the temperature of the exhaust manifold of the engine is effectively controlled.
Wherein the second range and the third step length may both be obtained from experimental data, may be different for different types of engines, and may be fixed when calibrating the same engine.
Step S42, a third current oil injection coefficient is summed with the third step length to obtain a third oil injection coefficient, and the oil injection quantity is controlled according to the third oil injection coefficient
The third step length is a negative value, so that a third fuel injection coefficient obtained by summing the third current fuel injection coefficient and the third step length is smaller than the third current fuel injection coefficient, which is a fuel injection coefficient when the third step length is output.
Steps S41 and S42 may be performed in parallel with the steps of fig. 1 and 3 to collectively complete temperature control of the engine exhaust manifold.
In particular embodiments, an upper limit and a lower limit of the injection coefficient may be set, and it will be understood that the steps of fig. 1, fig. 3, and fig. 4 may each change the injection coefficient, and that the amount of fuel injected by the engine may be determined according to the upper limit or the lower limit of the injection coefficient when the injection coefficient exceeds the upper limit or the lower limit.
The embodiment of the invention also provides a temperature control device of the engine exhaust manifold, and the structural schematic diagram of the temperature control device is shown in figure 5.
The engine exhaust manifold temperature control apparatus 50 may include:
the first step length unit 51 is suitable for acquiring the current temperature of an exhaust manifold of the engine, determining a first frequency according to the current temperature and a target temperature, and outputting a first step length at the first frequency, wherein the first frequency is positively correlated with the difference value between the current temperature and the target temperature.
A first injection coefficient unit 52 adapted to add the first step size to a first current injection coefficient each time the first step size is output, the first current injection coefficient being an injection coefficient at which the first step size is output, the injection coefficient being used to control an injection amount, to adjust a temperature of the engine exhaust manifold.
In a specific implementation, the temperature control device 50 of the engine exhaust manifold may further include an enrichment unit 53, referring to fig. 6, where the enrichment unit 53 may include:
a temperature increase rate judging subunit 531 adapted to judge an increase rate of the current temperature when the current temperature is lower than the target temperature and a temperature difference from the target temperature is within a first range;
a second step output subunit 532 adapted to output a second step when the rate of increase of the current temperature exceeds a first reference value;
a second injection coefficient subunit 533, adapted to sum the second step length and a second current injection coefficient to obtain a second injection coefficient, and control an injection amount according to the second injection coefficient to limit an increase rate of the temperature of the engine exhaust manifold;
wherein the second fuel injection coefficient is greater in value than the second current fuel injection coefficient, which is the fuel injection coefficient at which the second step is output.
Still referring to FIG. 5, in particular implementations, the engine exhaust manifold temperature control apparatus 50 may further include a lean-down unit 54; referring to fig. 7, the enleanment unit 54 may include:
a third step output unit 541 adapted to output a third step when the current temperature is lower than the target temperature and a temperature difference from the target temperature is within a second range;
the third oil injection coefficient unit 542 is adapted to sum a third current oil injection coefficient and the third step length to obtain a third oil injection coefficient, and control the oil injection quantity according to the third oil injection coefficient;
wherein the third current fuel injection coefficient is a fuel injection coefficient at which the third step is output, and a value of the third fuel injection coefficient is smaller than the third current fuel injection coefficient.
In a specific implementation, referring to fig. 8, the first step length unit 51 may include:
the variable step length subunit 511 is adapted to generate a variable step length according to the temperature difference between the current temperature and the target temperature, and different temperature difference ranges correspond to different values of the variable step length;
a first step length subunit 512, adapted to output the first step length according to the first frequency determined by the variable step length.
In a specific implementation, the first step length subunit is adapted to, when the numerical value of the variable step length is not changed, take a remainder of the accumulated value of the variable step length by using a first parameter as a divisor, and output the first step length once if the remainder is less than or equal to the numerical value of the variable step length;
the accumulated value of the variable step length is obtained by accumulating one variable step length for the accumulated value of the variable step length after the first step length is output every time, and when the accumulated value of the variable step length is left by taking a first parameter as a divisor for the first time, the initial numerical value of the accumulated value of the variable step length is equal to the numerical value of the variable step length; the first parameter is of a greater order of magnitude than the variable step size.
Fig. 9 shows an implementation of a temperature control device of an engine exhaust manifold in an embodiment of the invention.
The engine exhaust manifold temperature control device 90 may include an interface component 91, a first step component 92, a second step component 93, a third step component 94, and an increment component 95.
The interface part 91 is used for acquiring the current temperature and the target temperature of the exhaust manifold of the engine, and the specific implementation of the interface part can be seen in a temperature control method of the exhaust manifold of the engine; the first step length component 92, the second step length component 93 and the third step length component 94 are respectively used for generating a first step length, a second step length and a third step length; the increment unit 95 is configured to, when the step length is output by the first step unit 92, the second step unit 93, or the third step unit 94, add the step length to the current injection coefficient, and may determine whether the added injection coefficient is within a preset range, and if the added injection coefficient is outside the preset range, output the injection coefficient according to a boundary value of the preset range.
Fig. 10 illustrates a specific implementation of a first step element 92 in an embodiment of the present invention.
The variable step length is input to the accumulation part 101 in the first step length part 92 to obtain an accumulated value of the variable step length, and the accumulated value of the variable step length is input to the accumulation part 101 through the first delay part 102 to be accumulated with the variable step length, so that the accumulation process of the variable step length is realized.
The accumulated value of the variable step length is input to the remainder unit 103, remainder is performed by using the first parameter as a divisor, the remainder result is sent to the first comparison unit 104 and the second comparison unit 105 to perform comparison of the upper limit value and the lower limit value respectively, the upper limit value and the lower limit value can be adjusted, for example, whether the remainder is less than or equal to the variable step length value can be judged by the first comparison unit 104, whether the remainder value is greater than zero can be judged by the second comparison unit 105, and if the remainder value is greater than zero and less than or equal to the variable step length value, the first step length is output by the first step length output unit 106.
FIG. 11 is a graph showing the relationship between the variable step size, the first step size and the fuel injection coefficient in the embodiment of the present invention.
In fig. 11, the upper broken line is a graph showing the variation of the variable step size, the middle is a graph showing the output of the first step size, and the lower is a graph showing the variation of the injection coefficient. It can be seen that the larger the variable step size, the higher the frequency of outputting the first step size, and the injection coefficient varies with the first step size.
Only the relation between the injection coefficient and the first step is shown in fig. 11, and the relation between the injection coefficient and the second step and the third step is not shown, and it can be understood that the injection coefficient can be adaptively changed when the second step and the third step are output.
Fig. 12 shows a specific implementation of a second step member 93 in an embodiment of the present invention.
Determining whether a temperature difference between the current temperature and the target temperature is within a first range by the third comparing part 121; the current temperature obtained at a certain moment is delayed by the second delay part 122, and the delayed value and the newly measured current temperature are sent to the current temperature rise rate determining part 123 to determine the current temperature rise rate; it is determined whether the rate of increase of the current temperature is greater than the first reference value through the fourth comparing part 124, and if the temperature difference between the previous temperature and the target temperature is within the first range and the rate of increase of the current temperature is greater than the first reference value, a second step is output through the second step output part 125.
The specific implementation and beneficial effects of the temperature control device of the engine exhaust manifold in the embodiment of the invention can be seen in a temperature control method of the engine exhaust manifold, and are not described in detail.
FIG. 13 is a schematic diagram of the effect of the method and apparatus for controlling the exhaust manifold of an engine according to the present invention, plotted according to the results of actual tests. In fig. 13, the horizontal axis represents time, the vertical axis represents temperature, the broken line represents target temperature, and the solid line represents actual temperature of the engine exhaust manifold; therefore, the temperature control method and the temperature control device for the engine exhaust manifold can effectively control the temperature of the engine exhaust manifold and finally enable the temperature of the engine exhaust manifold to converge to the target temperature.
Those skilled in the art will appreciate that all or part of the steps in the methods of the above embodiments may be implemented by associated hardware instructed by a program, which may be stored in a computer-readable storage medium, and the storage medium may include: ROM, RAM, magnetic or optical disks, and the like.
Although the present invention is disclosed above, the present invention is not limited thereto. Various changes and modifications may be effected therein by one skilled in the art without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (8)
1. A method of controlling temperature of an engine exhaust manifold, comprising:
acquiring the current temperature of an exhaust manifold of an engine, determining a first frequency according to the current temperature and a target temperature, and outputting a first step size at the first frequency, wherein the first frequency is positively correlated with the difference between the current temperature and the target temperature;
determining a first frequency according to the current temperature and a target temperature, and outputting a first step size at the first frequency comprises: generating variable step length according to the temperature difference between the current temperature and the target temperature, wherein different temperature difference ranges correspond to different numerical values of the variable step length; outputting the first step length according to the first frequency determined by the variable step length;
and accumulating the first step length to a first current injection coefficient to adjust the temperature of the exhaust manifold of the engine each time the first step length is output, wherein the first current injection coefficient is the injection coefficient when the first step length is output, and the injection coefficient is used for controlling the injection quantity.
2. The engine exhaust manifold temperature control method according to claim 1, characterized by further comprising:
when the current temperature is lower than the target temperature and the temperature difference between the current temperature and the target temperature is within a first range, judging the rising rate of the current temperature;
when the rising rate of the current temperature exceeds a first reference value, outputting a second step length;
summing the second step length and a second current oil injection coefficient to obtain a second oil injection coefficient, and controlling the oil injection quantity according to the second oil injection coefficient so as to limit the rising rate of the temperature of the exhaust manifold of the engine;
wherein the second fuel injection coefficient is greater in value than the second current fuel injection coefficient, which is the fuel injection coefficient at which the second step is output.
3. The engine exhaust manifold temperature control method according to claim 1, characterized by further comprising: outputting a third step length when the current temperature is lower than the target temperature and the temperature difference with the target temperature is within a second range;
summing a third current oil injection coefficient and the third step length to obtain a third oil injection coefficient, and controlling the oil injection quantity according to the third oil injection coefficient;
wherein the third current fuel injection coefficient is a fuel injection coefficient at which the third step is output, and a value of the third fuel injection coefficient is smaller than the third current fuel injection coefficient.
4. The engine exhaust manifold temperature control method according to claim 1, wherein said outputting the first step size according to the first frequency determined by the variable step size includes:
when the numerical value of the variable step length is not updated, a first parameter is used as a divisor to carry out remainder on the accumulated value of the variable step length, and if the remainder is less than or equal to the numerical value of the variable step length, the first step length is output once;
the accumulated value of the variable step length is obtained by accumulating one variable step length for the accumulated value of the variable step length after the first step length is output every time, and when the accumulated value of the variable step length is left by taking a first parameter as a divisor for the first time, the initial numerical value of the accumulated value of the variable step length is equal to the numerical value of the variable step length; the first parameter is of a greater order of magnitude than the variable step size.
5. An engine exhaust manifold temperature control apparatus, comprising:
the device comprises a first step size unit, a second step size unit and a third step size unit, wherein the first step size unit is suitable for acquiring the current temperature of an exhaust manifold of the engine, determining a first frequency according to the current temperature and a target temperature, and outputting a first step size at the first frequency, and the first frequency is positively correlated with the difference value of the current temperature and the target temperature;
a first fuel injection coefficient unit adapted to add the first step length to a first current fuel injection coefficient each time the first step length is output, to adjust a temperature of the engine exhaust manifold, the first current fuel injection coefficient being a fuel injection coefficient at which the first step length is output, the fuel injection coefficient being used to control a fuel injection amount;
the first step length unit includes:
the variable step length subunit is suitable for generating a variable step length according to the temperature difference between the current temperature and the target temperature, and different temperature difference ranges correspond to different numerical values of the variable step length;
and the first step length subunit is suitable for outputting the first step length according to the first frequency determined by the variable step length.
6. The engine exhaust manifold temperature control apparatus according to claim 5, further comprising an enrichment unit that includes:
a temperature increase rate judgment subunit adapted to judge an increase rate of the current temperature when the current temperature is lower than the target temperature and a temperature difference from the target temperature is within a first range;
a second step output subunit adapted to output a second step when the rate of increase of the current temperature exceeds a first reference value;
the second oil injection coefficient subunit is suitable for summing the second step length and a second current oil injection coefficient to obtain a second oil injection coefficient, and controlling the oil injection quantity according to the second oil injection coefficient to limit the rising rate of the temperature of the exhaust manifold of the engine;
wherein the second fuel injection coefficient is greater in value than the second current fuel injection coefficient, which is the fuel injection coefficient at which the second step is output.
7. The engine exhaust manifold temperature control device according to claim 5, characterized by further comprising: a derating unit, the derating unit comprising:
a third step output unit adapted to output a third step when the current temperature is lower than the target temperature and a temperature difference from the target temperature is within a second range;
the third oil injection coefficient unit is suitable for summing a third current oil injection coefficient and the third step length to obtain a third oil injection coefficient, and the oil injection quantity is controlled according to the third oil injection coefficient;
wherein the third current fuel injection coefficient is a fuel injection coefficient at which the third step is output, and a value of the third fuel injection coefficient is smaller than the third current fuel injection coefficient.
8. The temperature control apparatus of an engine exhaust manifold according to claim 5, characterized in that the first step size subunit is adapted to, when the numerical value of the variable step size is not changed, take a remainder of the accumulated value of the variable step size by using a first parameter as a divisor, and output the first step size once if the remainder is less than or equal to the numerical value of the variable step size;
the accumulated value of the variable step length is obtained by accumulating one variable step length for the accumulated value of the variable step length after the first step length is output every time, and when the accumulated value of the variable step length is left by taking a first parameter as a divisor for the first time, the initial numerical value of the accumulated value of the variable step length is equal to the numerical value of the variable step length; the first parameter is of a greater order of magnitude than the variable step size.
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