CN118934190A - Exhaust temperature control method, device, electronic equipment and vehicle - Google Patents
Exhaust temperature control method, device, electronic equipment and vehicle Download PDFInfo
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- CN118934190A CN118934190A CN202411033672.2A CN202411033672A CN118934190A CN 118934190 A CN118934190 A CN 118934190A CN 202411033672 A CN202411033672 A CN 202411033672A CN 118934190 A CN118934190 A CN 118934190A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N9/00—Electrical control of exhaust gas treating 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
- Y02T10/12—Improving ICE efficiencies
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Abstract
The application provides a control method and device of exhaust temperature, electronic equipment and a vehicle, which belong to the technical field of automobiles and aim to control the exhaust temperature and avoid damage to parts such as an exhaust manifold and the like due to overhigh exhaust temperature, and the control method comprises the following steps: after an engine of a vehicle is started, acquiring working states of variable valve timing, wherein the working states comprise a starting state and a non-starting state; according to the working state, determining a temperature exhaust preset mapping relation of exhaust temperature, wherein the temperature exhaust preset mapping relation comprises exhaust temperatures corresponding to different operation conditions of the vehicle; determining the current exhaust temperature of the engine based on the current running condition and the exhaust temperature preset mapping relation of the vehicle; the current air-fuel ratio of the engine is adjusted based on the current exhaust temperature to reduce the current exhaust temperature.
Description
Technical Field
The present application relates to the field of automotive technologies, and in particular, to a method and an apparatus for controlling exhaust temperature, an electronic device, and a vehicle.
Background
When the engine works at high rotation speed and high load, the exhaust temperature is high, and the highest tolerance temperature of parts such as an engine exhaust manifold, a catalytic converter and the like is usually exceeded, so that the parts are damaged.
In order to avoid the occurrence of the above-mentioned situation, a temperature sensor is generally provided to monitor the exhaust temperature of the engine in real time, and when the exhaust temperature exceeds the highest temperature tolerance of components such as an exhaust manifold, the exhaust temperature is controlled to be adjusted.
However, the temperature sensor is affected by the working condition of the engine, and large detection deviation often occurs, which is unfavorable for subsequent regulation and control of the exhaust temperature.
Disclosure of Invention
In view of the foregoing, the present application is directed to a method, an apparatus, an electronic device, and a vehicle for controlling an exhaust temperature, so as to prevent damage to components such as an exhaust manifold due to an excessive exhaust temperature.
In order to achieve the above purpose, the technical scheme of the application is realized as follows:
a control method of exhaust gas temperature applied to a vehicle including a variable valve timing, comprising:
Acquiring working states of the variable valve timing after an engine of the vehicle is started, wherein the working states comprise a starting state and a non-starting state;
according to the working state, determining a temperature exhaust preset mapping relation of exhaust temperature, wherein the temperature exhaust preset mapping relation comprises exhaust temperatures corresponding to different operation conditions of the vehicle;
Determining the current exhaust temperature of the engine based on the current running condition of the vehicle and the preset mapping relation of the exhaust temperature;
And adjusting the current air-fuel ratio of the engine based on the current exhaust temperature to reduce the preset mapping relation exhaust temperature preset mapping relation of the current exhaust temperature preset mapping relation.
Further, the preset mapping relationship of the temperature discharge includes a first preset mapping relationship of the temperature discharge corresponding to the start state, and the first preset mapping relationship of the temperature discharge is determined by the following steps:
after the engine is started, controlling the variable valve timing to be in the start state;
Acquiring a first exhaust temperature under different first operating conditions;
determining the first exhaust temperature preset mapping relation based on the first operation condition and the first exhaust temperature;
Wherein the first operating condition includes an engine condition and a vehicle speed of the vehicle.
Further, the preset mapping relationship of the exhaust temperature includes a second preset mapping relationship of the exhaust temperature corresponding to the non-start state, and the second preset mapping relationship of the exhaust temperature is determined by the following steps:
after the engine is started, controlling the variable valve timing to be in the non-start state;
Acquiring a second exhaust temperature under a second, different operating condition;
Determining a second exhaust temperature preset mapping relation based on the second operation working condition and the second exhaust temperature;
Wherein the second operating condition includes an engine condition and a vehicle speed of the vehicle.
Further, the determining the current exhaust temperature of the engine based on the current operating condition of the vehicle and the exhaust temperature preset mapping relation includes:
Determining a steady-state exhaust temperature from the exhaust temperature preset mapping relation based on the current operation condition; the current operation conditions comprise the current operation condition of the engine and the current speed of the vehicle;
Obtaining a filter coefficient corresponding to the current working condition;
And correcting the steady-state exhaust temperature based on the filter coefficient to obtain the current exhaust temperature.
Further, the adjusting the current air-fuel ratio of the engine based on the current exhaust temperature includes:
comparing the current exhaust temperature with a preset exhaust temperature;
And when the current exhaust temperature exceeds the preset exhaust temperature, performing a enrichment operation on the current air-fuel ratio.
Further, the performing an enrichment operation on the current air-fuel ratio when the current exhaust temperature exceeds the preset exhaust temperature includes:
obtaining interpolation between the current exhaust temperature and the preset exhaust temperature;
determining an air-fuel ratio increase value based on the interpolation;
and increasing the current air-fuel ratio based on the air-fuel ratio increase value.
Further, after determining the current exhaust temperature of the engine based on the current operating condition of the vehicle and the exhaust temperature preset mapping relationship, the control method further includes:
acquiring environmental information of the vehicle, wherein the environmental information at least comprises atmospheric pressure and environmental temperature;
correcting the current exhaust temperature based on the environmental information, the current exhaust temperature and a corrected exhaust temperature preset mapping relation to obtain corrected current exhaust temperature; the corrected exhaust temperature preset mapping relation represents the current exhaust temperature under different environmental information;
the adjusting the current air-fuel ratio based on the current exhaust temperature includes:
And adjusting the current air-fuel ratio based on the corrected current exhaust temperature.
Compared with the prior art, the control method of the exhaust temperature has the following advantages:
the application provides a control method of exhaust temperature, which is applied to a vehicle, wherein the vehicle comprises variable valve timing, and the control method comprises the following steps: acquiring working states of the variable valve timing after an engine of the vehicle is started, wherein the working states comprise a starting state and a non-starting state; according to the working state, determining a temperature exhaust preset mapping relation of exhaust temperature, wherein the temperature exhaust preset mapping relation comprises exhaust temperatures corresponding to different operation conditions of the vehicle; determining the current exhaust temperature of the engine based on the current running condition of the vehicle and the preset mapping relation of the exhaust temperature; based on the current exhaust temperature, a current air-fuel ratio of the engine is adjusted to reduce the current exhaust temperature. Temperature discharge preset map relation temperature discharge preset mapping relation temperature-discharging preset mapping relation
Therefore, the influence of the working state of the variable valve timing on the exhaust temperature is considered, after the engine is started, the working state of the variable valve timing is firstly obtained, and according to the obtained working state, the exhaust temperature preset mapping relation of the exhaust temperature can be further obtained, wherein the exhaust temperature preset mapping relation comprises the exhaust temperatures corresponding to different operation conditions of the vehicle. Therefore, after the exhaust temperature preset mapping relation is determined, the current operation working condition of the vehicle can be obtained, and the current operation working condition is input into the exhaust temperature preset mapping relation, so that the current exhaust temperature of the engine can be determined. Therefore, the current exhaust temperature of the engine can be accurately obtained without setting a temperature sensor. After the current exhaust temperature of the engine is obtained, whether the current exhaust temperature exceeds the tolerance temperature of parts such as an exhaust manifold of the engine or not can be determined, and under the condition that the tolerance temperature exceeds the tolerance temperature, the current air-fuel ratio of the engine is enriched, so that the current exhaust temperature is reduced, and the parts such as the exhaust manifold and the like are prevented from being damaged due to the fact that the exhaust temperature is too high.
Another object of the present application is to provide an exhaust temperature control device for controlling the exhaust temperature, so as to avoid damage to components such as an exhaust manifold caused by excessive exhaust temperature.
In order to achieve the above purpose, the technical scheme of the application is realized as follows:
A control apparatus of exhaust gas temperature applied to a vehicle including a variable valve timing, comprising:
A first acquisition unit configured to acquire an operating state of the variable valve timing after an engine of the vehicle is started, the operating state including a start state and a non-start state;
the second acquisition unit is used for determining a temperature exhaust preset mapping relation of exhaust temperature according to the working state, wherein the temperature exhaust preset mapping relation comprises the exhaust temperature corresponding to different engine working conditions and different vehicle speeds;
the temperature determining unit is used for determining the current exhaust temperature of the engine based on the current running condition of the vehicle and the preset exhaust temperature mapping relation;
and the air-fuel ratio adjusting unit is used for adjusting the current air-fuel ratio of the engine based on the current exhaust temperature so as to reduce the temperature discharge preset mapping relation of the current exhaust temperature.
The control device has the same advantages as the control method described above with respect to the prior art, and will not be described in detail herein.
Another object of the present application is to provide an electronic device for controlling an exhaust temperature, so as to avoid damage to components such as an exhaust manifold caused by an excessive exhaust temperature.
In order to achieve the above purpose, the technical scheme of the application is realized as follows:
an electronic device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, the computer program implementing the control method described above when executed by the processor.
The electronic device and the control method have the same advantages as those of the prior art, and are not described in detail herein.
Another object of the present application is to provide a vehicle for controlling the exhaust temperature, so as to avoid damage to components such as an exhaust manifold caused by excessive exhaust temperature.
In order to achieve the above purpose, the technical scheme of the application is realized as follows:
A vehicle comprising a control unit for implementing the control method described above.
The vehicle has the same advantages as the control method described above with respect to the prior art, and will not be described in detail herein.
Drawings
The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain the application. In the drawings:
FIG. 1 is a flow chart of an exhaust temperature control method according to an embodiment of the application;
FIG. 2 is a schematic diagram illustrating a control flow of exhaust temperature according to an embodiment of the present application;
Fig. 3 is a schematic block diagram of an exhaust temperature control device according to an embodiment of the application.
Reference numerals:
101. A first acquisition unit; 102. a second acquisition unit; 103. a temperature determination unit; 104. an air-fuel ratio adjusting unit.
Detailed Description
It should be noted that the embodiments of the present application and the features of the embodiments may be combined with each other without collision.
The application will be described in detail below with reference to the drawings in connection with embodiments.
In the related art, in order to avoid detection errors caused by a temperature sensor, an ECU (Electronic Control Unit, an electronic control unit) is generally built with an exhaust temperature model, and the exhaust temperature of an engine is obtained in real time through the exhaust temperature model, and when the exhaust temperature exceeds the tolerance temperature of parts such as an exhaust manifold, measures for enriching the air-fuel ratio are taken to reduce the exhaust temperature.
However, in an engine in which a variable valve timing is disposed, under the same engine operating conditions, the exhaust temperature at which the variable valve timing is operated and not operated is different, and in general, the exhaust temperature at which the variable valve timing is operated is higher than the exhaust temperature at which the variable valve timing is not operated.
The influence of the working state of the variable valve timing on the exhaust temperature is not considered in the current exhaust temperature model, the exhaust temperature is calibrated when the variable valve timing is in the working state, so that when the variable valve timing does not work, the exhaust temperature obtained according to the exhaust temperature model is larger, the air-fuel ratio is further enriched too much, namely, extra fuel injection quantity is used, the whole vehicle energy is wasted, and the fuel economy is reduced.
Therefore, the embodiment of the application provides a control method for exhaust temperature, which considers the influence of the working state of the variable valve timing on the exhaust temperature, improves the calculation precision of the exhaust temperature, adjusts the current air-fuel ratio according to the accurate exhaust temperature, reduces the exhaust temperature, saves fuel while avoiding the damage of parts such as an exhaust manifold and the like due to high temperature, and is beneficial to the energy saving of the whole vehicle. The control method may refer to fig. 1, fig. 1 shows a flowchart of a control method of exhaust gas temperature according to an embodiment of the present application, and as shown in fig. 1, the control method is applied to a vehicle, the vehicle includes a variable valve timing, and the control method includes the following steps:
step S101, after the engine of the vehicle is started, acquiring an operating state of the variable valve timing, wherein the operating state includes a start state and a non-start state.
The variable valve timing refers to a means for periodically adjusting the valve opening and closing times of the engine and the intake air amount. That is, the variable valve timing is the control of the intake and exhaust of the engine, which results in: when the variable valve timing is operating normally, it will have some effect on the exhaust temperature of the engine. Specifically, under the same engine operating condition, the exhaust temperature corresponding to the variable valve timing when operating, i.e., in the start state, is higher than the exhaust temperature corresponding to the variable valve timing when not operating, i.e., in the non-start state.
Therefore, in order to obtain an accurate exhaust temperature and further accurately control the exhaust temperature, the operating state of the variable valve timing may be acquired after the engine is started, and the exhaust temperature may be further determined according to the operating state of the variable valve timing.
Engine starting refers to starting an engine, and a power output shaft of the engine rotates.
Step S102, determining a temperature exhaust preset mapping relation of exhaust temperature according to the working state, wherein the temperature exhaust preset mapping relation comprises exhaust temperature exhaust preset mapping relation corresponding to different operation working conditions of the vehicle.
After determining the operating state of the variable valve timing, a temperature exhaust preset map of the exhaust temperature may be determined, the temperature exhaust preset map corresponding to the operating state of the variable valve timing. Specifically, if the working state of the variable valve timing is a starting state, the determined exhaust temperature preset mapping relation is a first exhaust temperature preset mapping relation corresponding to the starting state; if the working state of the variable valve timing is a non-starting state, the determined exhaust temperature preset mapping relation is a second exhaust temperature preset mapping relation corresponding to the non-starting state.
In actual situations, besides the effect of the working state of the variable valve timing on the exhaust temperature, the operation condition of the vehicle may also have an effect on the exhaust temperature, for example, the engine condition and the vehicle speed, so in the embodiment of the present application, the exhaust temperature preset mapping relationship may include the exhaust temperatures corresponding to different operation conditions of the vehicle.
If the working state of the variable valve timing is a starting state, the exhaust temperature preset mapping relation reflects the exhaust temperatures corresponding to different operation conditions when the variable valve timing is in the starting state; if the working state of the variable valve timing is a non-starting state, the exhaust temperature preset mapping relation reflects the exhaust temperatures corresponding to different operation conditions when the variable valve timing is in the non-starting state.
The engine operating conditions may include at least one of a speed, a load, an air-fuel ratio, and an ignition angle of the engine, among others.
In one example, engine operating conditions may also include other operating conditions that affect exhaust gas temperature.
Thus, the exhaust temperature conforming to the variable valve timing operating state can be obtained by the exhaust temperature preset map. Thus, an accurate exhaust temperature can be obtained regardless of whether the variable valve timing is in the activated state or in the deactivated state.
Step S103, determining a current exhaust temperature of the engine based on the current operating condition of the vehicle and the preset exhaust temperature mapping relationship.
Because the exhaust temperature preset mapping relation comprises the exhaust temperatures corresponding to different operation conditions of the vehicle, after the exhaust temperature preset mapping relation corresponding to the operation state of the variable valve timing is obtained, the current operation condition of the vehicle, such as the current condition of the engine and the current speed of the vehicle, is obtained, the current operation condition of the vehicle is input into the exhaust temperature preset mapping relation, the exhaust temperature matched with the current operation condition, namely the current exhaust temperature of the engine, is determined from the exhaust temperature preset mapping relation, and the current exhaust temperature is matched with the current operation state of the variable valve timing.
In this way, even if the current operating condition and the current vehicle speed are identical, the obtained current exhaust temperature will not be identical in different variable valve timing operating states.
Therefore, the embodiment of the application considers the influence of the working state of the variable valve timing and the operation working condition of the vehicle on the exhaust temperature, and can obtain the accurate exhaust temperature by acquiring the current operation working condition of the vehicle and the exhaust temperature preset mapping relation corresponding to the working state of the variable valve timing, thereby being beneficial to the follow-up accurate control of the exhaust temperature.
Wherein the current operating condition of the engine includes at least one of a current rotational speed of the engine, a current load, a current air-fuel ratio, and a current ignition angle.
The current rotating speed and the current load of the engine can be obtained through the ECU, parameters such as a throttle position, a water temperature, an air flow and the like of the engine can be further obtained after the ECU obtains the front rotating speed and the current load, and the current air-fuel ratio of the engine is calculated according to the obtained parameters; the current firing angle may be obtained by a timing instrument.
Step S104 of adjusting the current air-fuel ratio based on the current exhaust gas temperature to reduce the current exhaust gas temperature.
After the current exhaust temperature matched with the working state of the variable valve timing and the current running working condition of the vehicle is determined, the current air-fuel ratio of the engine can be accurately adjusted, and the problem of high fuel consumption caused by excessive enrichment of the air-fuel ratio is avoided.
Specifically, if the current exhaust temperature is higher and exceeds the tolerance temperature of the parts such as the exhaust manifold, the current air-fuel ratio can be properly enriched, the fuel injection quantity is increased, the current exhaust temperature is reduced, and the current exhaust temperature is lower than the tolerance temperature of the parts such as the exhaust manifold but not far lower than the tolerance temperature, so that the parts are not damaged, the air-fuel ratio is excessively enriched, and the fuel resource is further saved.
Therefore, the embodiment of the application considers the influence of the working state of the variable valve timing on the exhaust temperature, and after the engine is started, the working state of the variable valve timing is firstly obtained, and then the exhaust temperature preset mapping relation corresponding to the working state of the variable valve timing is obtained, wherein the exhaust temperature preset mapping relation comprises the exhaust temperatures corresponding to different running working conditions of the vehicle. Therefore, after the preset mapping relation of the exhaust temperature is determined, the current operation condition of the vehicle can be obtained, and the current operation condition of the vehicle is input into the preset mapping relation of the exhaust temperature, so that the current exhaust temperature can be determined. Therefore, the current exhaust temperature of the engine can be accurately obtained without setting a temperature sensor. After the current exhaust temperature of the engine is obtained, whether the current exhaust temperature exceeds the tolerance temperature of parts such as an exhaust manifold of the engine or not can be determined, and under the condition that the current exhaust temperature exceeds the tolerance temperature, the current air-fuel ratio of the engine is enriched, so that the current exhaust temperature is reduced and is lower than the tolerance temperature of the parts such as the exhaust manifold but not far lower than the tolerance temperature, thereby protecting the parts from damage and excessively enriching the air-fuel ratio, and further saving fuel resources.
In an alternative embodiment, the preset mapping relationship of temperature discharge includes a first preset mapping relationship of temperature discharge corresponding to the start state, and the first preset mapping relationship of temperature discharge is determined by the following steps:
after the engine is started, controlling the variable valve timing to be in the start state;
Acquiring a first exhaust temperature under different first operating conditions;
determining the first exhaust temperature preset mapping relation based on the first operation condition and the first exhaust temperature;
Wherein the first operating condition includes an engine condition and a vehicle speed of the vehicle.
In the bench test, a plurality of different first operation conditions including an engine condition and a vehicle speed of the vehicle are preset, that is, a plurality of different first engine conditions and a plurality of different first vehicle speeds may be preset, and then, the engine is controlled to be started and the variable valve timing is controlled to be in a start state. Testing is performed according to a plurality of different first engine working conditions and a plurality of different first vehicle speeds, and a plurality of first exhaust temperatures corresponding to the first engine working conditions and the first vehicle speeds are obtained.
And then, determining a first exhaust temperature preset mapping relation corresponding to the starting state according to the obtained first exhaust temperatures, a preset first engine working conditions and a first vehicle speed.
Therefore, the embodiment of the application not only considers the working condition of the engine and the influence of the vehicle speed on the exhaust temperature, but also fully considers the influence of the variable valve timing on the exhaust temperature when the variable valve timing is in the starting state, and changes the working condition of the engine and the vehicle speed when the variable valve timing is in the starting state, so as to acquire a plurality of exhaust temperatures, and further determine the first exhaust temperature preset mapping relation corresponding to the starting state.
In this way, in the actual use process of the vehicle, after the engine is started, if the variable valve timing is determined to be in the starting state, the first exhaust temperature preset mapping relation corresponding to the starting state can be obtained. Then, the current working condition of the engine and the current speed of the vehicle are obtained, the current working condition and the current speed of the vehicle are input into a first exhaust temperature preset mapping relation corresponding to the starting state, and the current exhaust temperature of the engine is determined from the first exhaust temperature preset mapping relation.
Therefore, the embodiment of the application can obtain the accurate exhaust temperature by acquiring the current working condition and the current vehicle speed of the engine and the first exhaust temperature preset mapping relation corresponding to the working state of the variable valve timing, and is beneficial to the follow-up accurate control of the exhaust temperature.
In an alternative embodiment, the preset mapping relationship of the exhaust temperature includes a second preset mapping relationship of the exhaust temperature corresponding to the non-start state, and the second preset mapping relationship of the exhaust temperature is determined by the following steps:
after the engine is started, controlling the variable valve timing to be in the non-start state;
Acquiring a second exhaust temperature under a second, different operating condition;
And determining the second exhaust temperature preset mapping relation based on the second operation working condition and the second exhaust temperature.
In bench testing, a plurality of different second operating conditions are preset, including an engine condition and a vehicle speed of the vehicle, that is, a plurality of different second engine conditions and a plurality of different second vehicle speeds may be preset, and then, the engine is controlled to start and the variable valve timing is controlled to be in a non-start state. And testing according to a plurality of different second engine working conditions and a plurality of different second vehicle speeds to obtain a plurality of second exhaust temperatures corresponding to the second engine working conditions and the second vehicle speeds.
And then, determining a second exhaust temperature preset mapping relation corresponding to the non-starting state according to the obtained second exhaust temperatures, a preset second engine working conditions and a second vehicle speed.
Therefore, the embodiment of the application not only considers the working condition of the engine and the influence of the vehicle speed on the exhaust temperature, but also fully considers the influence of the variable valve timing on the exhaust temperature when the variable valve timing is in the non-starting state, and changes the working condition of the engine and the vehicle speed when the variable valve timing is in the non-starting state, so as to acquire a plurality of exhaust temperatures, and further determine a second exhaust temperature preset mapping relation corresponding to the non-starting state.
In this way, in the actual use process of the vehicle, after the engine is started, if the variable valve timing is determined to be in the non-starting state, the second exhaust temperature preset mapping relation corresponding to the non-starting state can be obtained. And then, the current working condition of the engine and the current speed of the vehicle are obtained, the current working condition and the current speed are input into a second exhaust temperature preset mapping relation corresponding to the non-starting state, and the current exhaust temperature of the engine is determined from the second exhaust temperature preset mapping relation.
Therefore, the embodiment of the application can obtain the accurate exhaust temperature by acquiring the current working condition and the current vehicle speed of the engine and the second exhaust temperature preset mapping relation corresponding to the non-starting state of the variable valve timing, and is beneficial to the follow-up accurate control of the exhaust temperature.
In an alternative embodiment, in the process of determining the current exhaust temperature of the engine based on the current operation condition of the vehicle and the exhaust temperature preset mapping relation, the method may include the following steps:
Determining a steady-state exhaust temperature from the exhaust temperature preset mapping relation based on the current operation condition; the current operation conditions comprise the current operation condition of the engine and the current speed of the vehicle;
Obtaining a filter coefficient corresponding to the current working condition;
And correcting the steady-state exhaust temperature based on the filter coefficient to obtain the current exhaust temperature.
The exhaust temperature preset mapping relation is obtained based on bench test, so that the exhaust temperature preset mapping relation actually represents the exhaust temperature under the steady-state working condition of the engine, and the obtained current operation working condition, namely the current working condition of the engine and the current speed of the vehicle, are input into the exhaust temperature preset mapping relation, and the obtained actual exhaust temperature under the steady-state working condition, namely the steady-state exhaust temperature.
Therefore, dynamic condition correction can be performed on the steady-state exhaust temperature. Specifically, a filter coefficient corresponding to the current operating condition of the engine may be obtained, and in particular, a filter coefficient corresponding to the current rotational speed of the engine may be obtained, because the rotational speeds of the engines are different, and the corresponding filter coefficients are different, and the filter coefficients may affect the filter value, which may affect the actual exhaust temperature. That is, under the dynamic working condition, the steady-state exhaust temperature determined from the exhaust temperature preset mapping relation changes along with the filter coefficient.
Therefore, after the filter coefficient is determined, the steady-state exhaust temperature may be further corrected according to the filter coefficient to obtain the current exhaust temperature.
Therefore, the embodiment of the application also considers the influence of the dynamic working condition of the engine on the exhaust temperature, and further corrects the exhaust temperature after the exhaust temperature is acquired through the exhaust temperature preset mapping relation, so that the acquired current exhaust temperature is more accurate, and the follow-up accurate control of the exhaust temperature is facilitated.
In an alternative embodiment, in the process of adjusting the current air-fuel ratio of the engine based on the current exhaust gas temperature, the method may include the steps of:
comparing the current exhaust temperature with a preset exhaust temperature;
And when the current exhaust temperature exceeds the preset exhaust temperature, performing a enrichment operation on the current air-fuel ratio.
After the current exhaust temperature is determined, the current exhaust temperature may be compared with a preset exhaust temperature, which is a resistant temperature of components such as an exhaust manifold.
Thus, when the comparison is made, if the current exhaust temperature exceeds the preset exhaust temperature, it is indicated that the current exhaust temperature exceeds the tolerance temperature of the components such as the exhaust manifold, in which case, in order to avoid damage to the components such as the exhaust manifold due to high temperature, the current air-fuel ratio may be adjusted, specifically, an enrichment operation is performed on the current air-fuel ratio, the fuel injection amount is increased, the current exhaust temperature is lowered, and the tolerance temperature of the components such as the exhaust manifold is lower than the preset exhaust temperature.
If the current exhaust temperature does not exceed the preset exhaust temperature, the enrichment operation is not performed on the current air-fuel ratio, and when the acquired current exhaust temperature exceeds the preset exhaust temperature, the enrichment operation is performed on the current air-fuel ratio.
Therefore, the embodiment of the application compares the current exhaust temperature of the engine obtained in real time with the preset exhaust temperature by setting the preset exhaust temperature representing the tolerance temperature of the parts such as the exhaust manifold and the like, and when the current exhaust temperature exceeds the preset exhaust temperature, the current air-fuel ratio is enriched to reduce the front exhaust temperature and lower than the tolerance temperature of the parts such as the exhaust manifold and the like, thereby avoiding the situation that the parts such as the exhaust manifold and the like are damaged due to the overhigh exhaust temperature.
In an alternative embodiment, in the process of performing the enrichment operation on the current air-fuel ratio when the current exhaust gas temperature exceeds the preset exhaust gas temperature, the method may include the steps of:
obtaining interpolation between the current exhaust temperature and the preset exhaust temperature;
determining an air-fuel ratio increase value based on the interpolation;
and increasing the current air-fuel ratio based on the air-fuel ratio increase value.
Although an accurate current exhaust temperature is obtained, the situation that the air-fuel ratio is excessively enriched, and therefore extra fuel injection is caused and fuel resources are wasted may still occur.
In order to avoid the occurrence of the above, after the current exhaust temperature is obtained, interpolation between the current exhaust temperature and the preset exhaust temperature may be further obtained, an air-fuel ratio to be enriched, that is, an air-fuel ratio increasing value may be determined according to the interpolation, and then the air-fuel ratio increasing value may be increased on the basis of the current air-fuel ratio to enrich the current air-fuel ratio.
In this way, after the rich air-fuel ratio is added, the current exhaust gas temperature may be made lower than the preset exhaust gas temperature, but the current exhaust gas temperature may not be made excessively low.
Therefore, by calculating interpolation between the current exhaust temperature and the preset exhaust temperature, determining the air-fuel ratio increasing value and enriching the current air-fuel ratio according to the air-fuel ratio increasing value, the exhaust temperature can be controlled below the preset exhaust temperature, and the air-fuel ratio can not be enriched too much, so that the exhaust temperature is too low to increase the oil consumption.
In an alternative embodiment, after the determining the current exhaust temperature of the engine based on the current operation condition of the vehicle and the exhaust temperature preset map, the following steps may be further performed:
acquiring environmental information of the vehicle, wherein the environmental information at least comprises atmospheric pressure and environmental temperature;
correcting the current exhaust temperature based on the environmental information, the current exhaust temperature and a corrected exhaust temperature preset mapping relation to obtain corrected current exhaust temperature; the corrected exhaust temperature preset mapping relation represents the current exhaust temperature under different environmental information;
the adjusting the current air-fuel ratio based on the current exhaust temperature includes:
And adjusting the current air-fuel ratio based on the corrected current exhaust temperature.
In practice, in addition to the effect of the vehicle itself (engine condition, vehicle speed, variable valve timing) on the exhaust temperature, the environment in which the vehicle is located also has an effect on the exhaust temperature, in particular the atmospheric pressure and the ambient temperature.
Therefore, after the current exhaust temperature is determined according to the exhaust temperature preset map, the current exhaust temperature may be further corrected.
Before correction, the relationship among the atmospheric pressure, the ambient temperature and the current exhaust temperature can be calibrated in advance, and a corrected exhaust temperature preset mapping relationship is obtained.
Then, the environmental information of the vehicle, which includes the atmospheric pressure and the environmental temperature, can be obtained, and then, the current exhaust temperature is corrected according to the environmental information, the current exhaust temperature and the corrected exhaust temperature preset mapping relation, so as to obtain the corrected current exhaust temperature.
Then, the current air-fuel ratio is adjusted according to the corrected current exhaust temperature.
Specifically, the corrected current exhaust temperature is compared with the preset exhaust temperature, if the corrected current exhaust temperature exceeds the preset exhaust temperature, the corrected current exhaust temperature is indicated to exceed the tolerance temperature of parts such as an exhaust manifold, in this case, in order to avoid damage to the parts such as the exhaust manifold due to high temperature, the current air-fuel ratio may be adjusted, specifically, an enrichment operation is performed on the current air-fuel ratio, the fuel injection amount is increased, so that the current exhaust temperature is reduced and is lower than the preset exhaust temperature, that is, lower than the tolerance temperature of the parts such as the exhaust manifold; if the corrected current exhaust temperature does not exceed the preset exhaust temperature, the enrichment operation is not performed on the current air-fuel ratio, and when the acquired corrected current exhaust temperature exceeds the preset exhaust temperature, the enrichment operation is performed on the current air-fuel ratio.
Wherein, the air-fuel ratio to be enriched, namely the air-fuel ratio increasing value, can be determined according to interpolation by obtaining interpolation between the corrected current exhaust temperature and the preset exhaust temperature, then the air-fuel ratio increasing value is increased on the basis of the current air-fuel ratio, and the current air-fuel ratio is enriched, thereby reducing the current exhaust temperature.
Therefore, the embodiment of the application considers the influence of the environment where the vehicle is located on the exhaust temperature, further corrects the current exhaust temperature according to the pre-calibrated corrected exhaust temperature preset mapping relation, reduces the error between the calculated exhaust temperature and the actual exhaust temperature, and is beneficial to the follow-up accurate control of the exhaust temperature.
An embodiment of the present application will be described below with reference to fig. 2 in conjunction with a specific example:
Fig. 2 shows a schematic diagram of a control flow of exhaust temperature according to an embodiment of the present application, and as shown in fig. 2, an operating state of variable valve timing is obtained after an engine of a vehicle is started.
And if the working state of the variable valve timing is a starting state, acquiring a first temperature discharge preset mapping relation corresponding to the starting state. Then, the current rotating speed, the current load, the current air-fuel ratio, the current ignition angle and the current speed of the vehicle of the engine are obtained, the current rotating speed, the current load, the current air-fuel ratio, the current ignition angle and the current speed are input into a first exhaust temperature preset mapping relation corresponding to the starting state, and the steady-state exhaust temperature is obtained. And then, obtaining a filter coefficient corresponding to the current rotating speed, and correcting the steady-state exhaust temperature according to the filter coefficient to obtain the current exhaust temperature. And then, acquiring the atmospheric pressure and the ambient temperature in the environment of the vehicle, and correcting the current exhaust temperature according to the atmospheric pressure, the ambient temperature, the current exhaust temperature and the corrected exhaust temperature preset mapping relation to obtain the corrected current exhaust temperature. And then comparing the corrected current exhaust temperature with a preset exhaust temperature, if the corrected exhaust temperature exceeds the preset exhaust temperature, obtaining interpolation between the corrected current exhaust temperature and the preset exhaust temperature, determining an air-fuel ratio increasing value according to the interpolation, then increasing the air-fuel ratio increasing value on the basis of the current air-fuel ratio, and enriching the current air-fuel ratio to ensure that the current exhaust temperature of the engine is lower than the preset exhaust temperature.
And if the working state of the variable valve timing is a non-starting state, acquiring a second temperature discharge preset mapping relation corresponding to the non-starting state. Then, the current rotating speed, the current load, the current air-fuel ratio, the current ignition angle and the current speed of the vehicle of the engine are obtained, the current rotating speed, the current load, the current air-fuel ratio, the current ignition angle and the current speed of the vehicle are input into a second exhaust temperature preset mapping relation corresponding to the starting state, and the steady-state exhaust temperature is obtained. And then, obtaining a filter coefficient corresponding to the current rotating speed, and correcting the steady-state exhaust temperature according to the filter coefficient to obtain the current exhaust temperature. And then, acquiring the atmospheric pressure and the ambient temperature in the environment of the vehicle, and correcting the current exhaust temperature according to the atmospheric pressure, the ambient temperature, the current exhaust temperature and the corrected exhaust temperature preset mapping relation to obtain the corrected current exhaust temperature. And then comparing the corrected current exhaust temperature with a preset exhaust temperature, if the corrected exhaust temperature exceeds the preset exhaust temperature, obtaining interpolation between the corrected current exhaust temperature and the preset exhaust temperature, determining an air-fuel ratio increasing value according to the interpolation, then increasing the air-fuel ratio increasing value on the basis of the current air-fuel ratio, and enriching the current air-fuel ratio to ensure that the current exhaust temperature of the engine is lower than the preset exhaust temperature.
Based on the same inventive concept, an embodiment of the present application further provides an exhaust gas temperature control device, referring to fig. 3, fig. 3 shows a schematic block diagram of an exhaust gas temperature control device according to an embodiment of the present application, as shown in fig. 3, where the control device is applied to a vehicle, the vehicle includes a variable valve timing, and the determining device includes:
A first acquisition unit 101 configured to acquire an operating state of the variable valve timing after an engine of the vehicle is started, the operating state including a start state and a non-start state;
a second obtaining unit 102, configured to determine, according to the working state, a preset exhaust temperature mapping relationship of an exhaust temperature, where the preset exhaust temperature mapping relationship includes exhaust temperatures corresponding to different engine working conditions and different vehicle speeds;
a temperature determining unit 103, configured to determine a current exhaust temperature of the engine based on a current operation condition of the vehicle and the exhaust temperature preset mapping relationship;
an air-fuel ratio adjustment unit 104 for adjusting a current air-fuel ratio of the engine based on the current exhaust gas temperature to reduce the current exhaust gas temperature.
In an optional implementation manner, the temperature-discharging preset mapping relation includes a first temperature-discharging preset mapping relation corresponding to the starting state, the control device includes a first temperature-discharging preset mapping relation unit, and the first temperature-discharging preset mapping relation unit includes:
a start-up state unit for controlling the variable valve timing to be in the start-up state after the engine is started up;
A first exhaust gas temperature acquisition unit configured to acquire a first exhaust gas temperature under different first operation conditions;
the first determining unit is used for determining the first exhaust temperature preset mapping relation based on the first operation condition and the first exhaust temperature;
Wherein the first operating condition includes an engine condition and a vehicle speed of the vehicle.
In an optional implementation manner, the temperature-discharging preset mapping relation includes a second temperature-discharging preset mapping relation corresponding to the non-starting state, the control device includes a second temperature-discharging preset mapping relation unit, and the second temperature-discharging preset mapping relation unit includes:
A non-start state unit for controlling the variable valve timing to be in the non-start state after the engine is started;
a second exhaust gas temperature acquisition unit for acquiring a second exhaust gas temperature under a second different operating condition;
The second determining unit is used for determining a second exhaust temperature preset mapping relation based on the second operation working condition and the second exhaust temperature;
Wherein the second operating condition includes an engine condition and a vehicle speed of the vehicle.
In an alternative embodiment, the temperature determining unit 103 includes:
the steady-state exhaust temperature determining unit is used for determining the steady-state exhaust temperature from the exhaust temperature preset mapping relation based on the current operation condition; the current operation conditions comprise the current operation condition of the engine and the current speed of the vehicle;
The filter coefficient acquisition unit is used for acquiring a filter coefficient corresponding to the current working condition;
And the current exhaust temperature determining unit is used for correcting the steady-state exhaust temperature based on the filter coefficient to obtain the current exhaust temperature.
In an alternative embodiment, the air-fuel ratio adjustment unit 104 includes:
a comparison unit for comparing the current exhaust temperature with a preset exhaust temperature;
And an enrichment unit configured to perform an enrichment operation on the current air-fuel ratio when the current exhaust temperature exceeds the preset exhaust temperature.
In an alternative embodiment, the enrichment unit comprises:
An interpolation determining unit for obtaining interpolation between the current exhaust temperature and the preset exhaust temperature;
an air-fuel ratio increase value determining unit configured to determine an air-fuel ratio increase value based on the interpolation;
And the enrichment subunit is used for increasing the current air-fuel ratio based on the air-fuel ratio increasing value.
In an alternative embodiment, the control device further comprises a correction unit for performing the following steps after the temperature determination unit 103 determines the current exhaust gas temperature:
acquiring environmental information of the vehicle, wherein the environmental information at least comprises atmospheric pressure and environmental temperature;
correcting the current exhaust temperature based on the environmental information, the current exhaust temperature and a corrected exhaust temperature preset mapping relation to obtain corrected current exhaust temperature; the corrected exhaust temperature preset mapping relation represents the current exhaust temperature under different environmental information;
The air-fuel ratio adjustment unit 104 includes:
An air-fuel ratio adjustment subunit for adjusting the current air-fuel ratio of the engine based on the corrected current exhaust gas temperature.
Based on the same inventive concept, the embodiment of the application also provides an electronic device, which comprises a memory, a processor and a computer program stored on the memory and capable of running on the processor, wherein the computer program realizes the control method of the exhaust temperature when being executed by the processor.
Based on the same inventive concept, the embodiment of the application also provides a vehicle, which comprises a control unit for realizing the control method of the exhaust temperature.
For the device embodiments, since they are substantially similar to the method embodiments, the description is relatively simple, and reference is made to the description of the method embodiments for relevant points.
In this specification, each embodiment is described in a progressive manner, and each embodiment is mainly described by differences from other embodiments, and identical and similar parts between the embodiments are all enough to be referred to each other.
It will be apparent to those skilled in the art that embodiments of the present invention may be provided as a method, apparatus, or computer program product. Accordingly, embodiments of the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, embodiments of the invention may take the form of a computer program product on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, etc.) having computer-usable program code embodied therein.
Embodiments of the present invention are described with reference to flowchart illustrations and/or block diagrams of methods, terminal devices (systems), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing terminal device to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing terminal device, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. It is therefore intended that the following claims be interpreted as including the preferred embodiment and all such alterations and modifications as fall within the scope of the embodiments of the invention.
Finally, it is further noted that relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or terminal that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or terminal. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or terminal device that comprises the element.
The foregoing has outlined rather broadly the more detailed description of the application in order that the detailed description of the application that follows may be better understood, and in order that the present contribution to the art may be better appreciated. While various modifications of the embodiments and applications of the application will occur to those skilled in the art, it is not necessary and not intended to be exhaustive of all embodiments, and obvious modifications or variations of the application are within the scope of the application.
Claims (10)
1. A control method of exhaust gas temperature, characterized by being applied to a vehicle including a variable valve timing, comprising:
Acquiring working states of the variable valve timing after an engine of the vehicle is started, wherein the working states comprise a starting state and a non-starting state;
according to the working state, determining a temperature exhaust preset mapping relation of exhaust temperature, wherein the temperature exhaust preset mapping relation comprises exhaust temperatures corresponding to different operation conditions of the vehicle;
Determining the current exhaust temperature of the engine based on the current running condition of the vehicle and the preset mapping relation of the exhaust temperature;
Based on the current exhaust temperature, a current air-fuel ratio of the engine is adjusted to reduce the current exhaust temperature.
2. The method according to claim 1, wherein the exhaust temperature preset map includes a first exhaust temperature preset map corresponding to the start state, the first exhaust temperature preset map being determined by:
after the engine is started, controlling the variable valve timing to be in the start state;
Acquiring a first exhaust temperature under different first operating conditions;
determining the first exhaust temperature preset mapping relation based on the first operation condition and the first exhaust temperature;
Wherein the first operating condition includes an engine condition and a vehicle speed of the vehicle.
3. The method according to claim 1, wherein the exhaust temperature preset map includes a second exhaust temperature preset map corresponding to the non-start state, the second exhaust temperature preset map being determined by:
after the engine is started, controlling the variable valve timing to be in the non-start state;
Acquiring a second exhaust temperature under a second, different operating condition;
Determining a second exhaust temperature preset mapping relation based on the second operation working condition and the second exhaust temperature;
Wherein the second operating condition includes an engine condition and a vehicle speed of the vehicle.
4. The method according to claim 1, wherein the determining the current exhaust temperature of the engine based on the current operating condition of the vehicle and the exhaust temperature preset map includes:
Determining a steady-state exhaust temperature from the exhaust temperature preset mapping relation based on the current operation condition; the current operation conditions comprise the current operation condition of the engine and the current speed of the vehicle;
Obtaining a filter coefficient corresponding to the current working condition;
And correcting the steady-state exhaust temperature based on the filter coefficient to obtain the current exhaust temperature.
5. The method according to claim 1, characterized in that the adjusting the current air-fuel ratio of the engine based on the current exhaust gas temperature includes:
comparing the current exhaust temperature with a preset exhaust temperature;
And when the current exhaust temperature exceeds the preset exhaust temperature, performing a enrichment operation on the current air-fuel ratio.
6. The method according to claim 5, characterized in that said performing an enrichment operation on said current air-fuel ratio when said current exhaust temperature exceeds said preset exhaust temperature, comprises:
obtaining interpolation between the current exhaust temperature and the preset exhaust temperature;
determining an air-fuel ratio increase value based on the interpolation;
and increasing the current air-fuel ratio based on the air-fuel ratio increase value.
7. The control method of an exhaust gas temperature according to claim 1, characterized in that after said determination of a current exhaust gas temperature of said engine based on a current operation condition of said vehicle and said exhaust temperature preset map, said control method further comprises:
acquiring environmental information of the vehicle, wherein the environmental information at least comprises atmospheric pressure and environmental temperature;
correcting the current exhaust temperature based on the environmental information, the current exhaust temperature and a corrected exhaust temperature preset mapping relation to obtain corrected current exhaust temperature; the corrected exhaust temperature preset mapping relation represents the current exhaust temperature under different environmental information;
the adjusting the current air-fuel ratio based on the current exhaust temperature includes:
And adjusting the current air-fuel ratio based on the corrected current exhaust temperature.
8. A control apparatus of exhaust gas temperature, characterized by being applied to a vehicle including a variable valve timing, comprising:
A first acquisition unit configured to acquire an operating state of the variable valve timing after an engine of the vehicle is started, the operating state including a start state and a non-start state;
the second acquisition unit is used for determining a temperature exhaust preset mapping relation of exhaust temperature according to the working state, wherein the temperature exhaust preset mapping relation comprises the exhaust temperature corresponding to different engine working conditions and different vehicle speeds;
the temperature determining unit is used for determining the current exhaust temperature of the engine based on the current running condition of the vehicle and the preset exhaust temperature mapping relation;
and an air-fuel ratio adjusting unit for adjusting a current air-fuel ratio of the engine based on the current exhaust gas temperature to reduce the current exhaust gas temperature.
9. An electronic device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, characterized in that the computer program when executed by the processor implements a method of controlling the exhaust gas temperature according to any of claims 1-7.
10. A vehicle, characterized in that the vehicle comprises a control unit for implementing a control method of exhaust gas temperature according to any one of claims 1-7.
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| CN202411033672.2A CN118934190A (en) | 2024-07-30 | 2024-07-30 | Exhaust temperature control method, device, electronic equipment and vehicle |
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| CN202411033672.2A CN118934190A (en) | 2024-07-30 | 2024-07-30 | Exhaust temperature control method, device, electronic equipment and vehicle |
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