CN112031942B - Thermal protection control method and device - Google Patents
Thermal protection control method and device Download PDFInfo
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- CN112031942B CN112031942B CN202010903505.4A CN202010903505A CN112031942B CN 112031942 B CN112031942 B CN 112031942B CN 202010903505 A CN202010903505 A CN 202010903505A CN 112031942 B CN112031942 B CN 112031942B
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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
- F02D29/00—Controlling engines, such controlling being peculiar to the devices driven thereby, the devices being other than parts or accessories essential to engine operation, e.g. controlling of engines by signals external thereto
- F02D29/02—Controlling engines, such controlling being peculiar to the devices driven thereby, the devices being other than parts or accessories essential to engine operation, e.g. controlling of engines by signals external thereto peculiar to engines driving vehicles; peculiar to engines driving variable pitch propellers
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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
- F01N11/00—Monitoring or diagnostic devices for exhaust-gas treatment apparatus, e.g. for catalytic activity
- F01N11/002—Monitoring or diagnostic devices for exhaust-gas treatment apparatus, e.g. for catalytic activity the diagnostic devices measuring or estimating temperature or pressure in, or downstream of the exhaust 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
- F02D2200/021—Engine temperature
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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
- F02D2200/023—Temperature of lubricating oil or working fluid
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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
- F02D2200/04—Engine intake system parameters
- F02D2200/0414—Air temperature
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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
- F02D2200/06—Fuel or fuel supply system parameters
- F02D2200/0606—Fuel temperature
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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
- F02D2200/10—Parameters related to the engine output, e.g. engine torque or engine speed
- F02D2200/1002—Output torque
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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
Abstract
The embodiment of the invention provides a thermal protection control method and a device, wherein the method comprises the following steps: acquiring the exhaust temperature of an engine; counting the timing duration of the exhaust temperature of the engine, wherein the timing duration is greater than or equal to a first temperature threshold and less than or equal to a second temperature threshold; determining a first torque limiting coefficient of the engine according to the relation between the timing duration and a preset time threshold and the exhaust temperature of the engine; and determining the target torque output of the engine according to the first torque limit coefficient and/or a second torque limit coefficient of the engine, wherein the second torque limit coefficient of the engine is the torque limit coefficient determined by at least one of the water temperature, the engine oil temperature, the fuel oil temperature and the air inlet temperature of the engine.
Description
Technical Field
The embodiment of the invention relates to the technical field of vehicle control, in particular to a thermal protection control method and device.
Background
The engine is an important part of the vehicle, can convert other forms of energy into mechanical energy, and is a power source of the vehicle.
The exhaust temperature during operation of the engine can be very high and overheating protection is required to avoid damage to the engine due to excessive engine exhaust temperatures. In the prior art, the protection control of the exhaust temperature overtemperature at the vortex end of the supercharger is realized by temporarily additionally installing a sensor on an engine stand or calibrating the protection parameters of the supercharger on a test vehicle. However, this protection control method has a disadvantage of poor versatility, and the reason for this is: the temperature and pressure difference between the engine pedestal and the air intake and exhaust system of the actual finished automobile is different, the configuration, performance and flow field distribution of the cooling system of the engine pedestal or the test finished automobile cannot cover all terminal vehicles, and the performance of the cooling system of the finished automobile is influenced by the operating condition, the operating time and the region where the cooling system is located. And then make the condition of exhaust temperature transfinite take place occasionally, increased the risk that exhaust pipe way surrounding parts broke.
The method adopted by the prior art has poor universality, and further has the problem of low accuracy and timeliness of exhaust temperature control.
Disclosure of Invention
The embodiment of the invention provides a thermal protection control method and device, which solve the problem of poor universality and can improve the accuracy and timeliness of exhaust temperature control.
In a first aspect, an embodiment of the present invention provides a thermal protection control method, including:
acquiring the exhaust temperature of an engine;
counting the timing duration of the exhaust temperature of the engine, wherein the exhaust temperature of the engine is greater than or equal to a first temperature threshold and less than or equal to a second temperature threshold;
determining a first torque limiting coefficient of the engine according to the relation between the timing duration and a preset time threshold and the exhaust temperature of the engine;
determining a target torque output of an engine based on the first torque limiting factor and/or a second torque limiting factor of the engine;
wherein the second torque limit coefficient of the engine is a torque limit coefficient determined by at least one of a water temperature, an oil temperature, a fuel temperature, and an intake air temperature of the engine.
Optionally, determining a target torque output of the engine according to the first torque limiting coefficient and/or a second torque limiting coefficient of the engine comprises:
acquiring an operation mode of an engine;
determining a target torque output of the engine according to a second torque limiting coefficient of the engine when the operating mode of the engine is a regeneration mode;
determining a target torque output of the engine based on the lesser of the first and second torque limiting coefficients when the operating mode of the engine is not a regeneration mode.
Optionally, determining a first torque limit coefficient of the engine according to a relationship between the timed period and a preset time threshold and an exhaust temperature of the engine, includes:
when the timing duration is less than or equal to a preset time threshold, determining a preset torque limit coefficient as a first torque limit coefficient of the engine;
and when the timing duration is greater than a preset time threshold, determining a first torque limiting coefficient of the engine according to the exhaust temperature of the engine and a preset mapping relation, wherein the preset mapping relation is a corresponding relation between the exhaust temperature of the engine and the torque limiting coefficient of the engine, and the preset torque limiting coefficient is greater than or equal to the maximum value of the torque limiting coefficient in the preset mapping relation.
Optionally, the method further includes:
when the exhaust temperature of the engine is smaller than a first temperature threshold value or larger than a second temperature threshold value, determining a first torque limit coefficient of the engine according to the exhaust temperature of the engine and a preset mapping relation;
determining a target torque output of the engine based on the first and/or second torque limiting coefficients.
Optionally, the method further includes:
when the exhaust temperature of the engine is between a first temperature threshold and a second temperature threshold and the timing duration is greater than a preset time threshold, sending first alarm information; and/or the presence of a gas in the gas,
and when the exhaust temperature of the engine is greater than a second temperature threshold value, sending second alarm information.
Optionally, after determining the target torque output of the engine, the method further includes:
and reducing the fuel injection quantity or adjusting the opening of a throttle valve to adjust the torque output of the engine to be the target torque output.
Optionally, the exhaust temperature of the engine is a temperature of a sensor upstream of an oxidation catalyst in the aftertreatment system, or the exhaust temperature of the engine is an average of a temperature of a sensor upstream and a temperature of a sensor downstream of an oxidation catalyst in the aftertreatment system.
In a second aspect, an embodiment of the present invention provides a thermal protection control apparatus, including:
the acquisition module is used for acquiring the exhaust temperature of the engine;
the counting module is used for counting the timing duration of the exhaust temperature of the engine, wherein the exhaust temperature of the engine is greater than or equal to a first temperature threshold and less than or equal to a second temperature threshold;
the determining module is used for determining a first torque limiting coefficient of the engine according to the relation between the timing duration and a preset time threshold and the exhaust temperature of the engine;
the determination module is further configured to determine a target torque output of an engine based on the first torque limiting coefficient and/or a second torque limiting coefficient of the engine;
wherein the second torque limit coefficient of the engine is a torque limit coefficient determined by at least one of a water temperature, an oil temperature, a fuel temperature, and an intake air temperature of the engine.
In a third aspect, an embodiment of the present invention provides a thermal protection control apparatus, including: at least one processor and a memory;
the memory stores computer execution instructions;
the at least one processor executing the computer-executable instructions stored by the memory causes the at least one processor to perform the thermal protection control method of any one of the first aspects.
In a fourth aspect, an embodiment of the present invention provides a computer-readable storage medium, where computer-executable instructions are stored, and when a processor executes the computer-executable instructions, the thermal protection control method according to any one of the first aspect is implemented.
According to the thermal protection control method and the thermal protection control device, the exhaust temperature of the engine is obtained, the timing duration of the exhaust temperature of the engine, which is greater than or equal to a first temperature threshold and less than or equal to a second temperature threshold, is counted, the first torque limiting coefficient of the engine is determined according to the relation between the timing duration and a preset time threshold and the exhaust temperature of the engine, and the target torque output of the engine is determined according to the first torque limiting coefficient and/or the second torque limiting coefficient of the engine, so that the output torque of the engine is adjusted in real time according to the exhaust temperature of the engine, the thermal protection control method and the thermal protection control device are suitable for different vehicles, have strong universality, and can increase the accuracy and timeliness of exhaust temperature control.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic view of an application scenario of a thermal protection control method according to an embodiment of the present invention;
fig. 2 is a flowchart of a thermal protection control method according to an embodiment of the present invention;
FIG. 3 is a flow chart of another thermal protection control method according to an embodiment of the present invention;
FIG. 4 is a map of exhaust temperature versus torque limiting coefficient provided in accordance with an embodiment of the present invention;
FIG. 5 is a flowchart of another thermal protection control method according to an embodiment of the present invention;
fig. 6 is a schematic structural diagram of a thermal protection control device according to an embodiment of the present invention;
fig. 7 is a schematic hardware structure diagram of a thermal protection control device according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The terms "first," "second," "third," "fourth," and the like in the description and in the claims, as well as in the drawings, if any, are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the invention described herein are, for example, capable of operation in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
Fig. 1 is a schematic view of an application scenario of a thermal protection Control method according to an embodiment of the present invention, as shown in fig. 1, the method is applied in an Electronic Control Unit (ECU) 101, the ECU101 receives an exhaust temperature sent by a temperature sensor in an aftertreatment system 102 of an engine, determines a torque limit coefficient of the engine 103 according to the exhaust temperature and a thermal protection Control strategy in the ECU, determines a target torque output according to the torque limit coefficient of the engine 103, and adjusts the torque output of the engine to the target torque output, so that the engine can operate at the target torque output.
The engine is an electric control engine, and various control functions can be completed by an electric control system. The aftertreatment system is a system for treating emissions in the exhaust emission of a diesel vehicle to achieve the conversion of harmful gases into harmless gases. A temperature sensor is provided in the aftertreatment system and may be used to measure the exhaust temperature of the engine.
In the prior art, in order to solve the problem that parts such as wire harnesses, a urea box, a fender and the like around an exhaust pipeline are baked due to overhigh exhaust temperature of an engine, protection parameters are calibrated on an engine bench or a test vehicle, and when the exhaust temperature reaches a preset threshold value, a torque limiting coefficient of the engine is adjusted to be a fixed value. However, the method has certain problems that the method is poor in universality, for example, the temperatures, pressures and the like of an engine pedestal and an air inlet system of an actual whole vehicle are different, and the configuration of a test vehicle cannot cover all vehicles, so calibrated protection parameters are not suitable for other vehicles. Under some conditions, reducing the torque limiting coefficient of the engine may result in a loss of power to the engine.
According to the thermal protection control method provided by the embodiment of the invention, the first torque limiting coefficient of the engine is determined according to the exhaust temperature of the engine and the timing duration of the engine in the preset temperature interval, the target torque output of the engine is determined according to the first torque limiting coefficient of the engine and/or the second torque limiting coefficient of the engine, and the torque limiting coefficient is determined by judging the interval in which the exhaust temperature of the engine is positioned and the timing duration of the exhaust temperature in the preset interval, so that the torque output of the engine is not changed when the exhaust temperature is in a not-high state for a short time, unnecessary power loss is reduced, the torque limiting coefficient can be adjusted in real time according to the exhaust temperature of the engine, the method has strong universality, and the actual requirements under different working conditions can be met.
The technical solution of the present invention will be described in detail below with specific examples. These several specific embodiments may be combined with each other below, and details of the same or similar concepts or processes may not be repeated in some embodiments.
Fig. 2 is a flowchart of a thermal protection control method according to an embodiment of the present invention, where the method of the embodiment may be executed by an ECU. As shown in fig. 2, the method of this embodiment may include:
s201: the exhaust temperature of the engine is obtained.
In the embodiment, the exhaust temperature of the engine can be acquired from an aftertreatment system, specifically, a temperature sensor is arranged in the aftertreatment system, and the exhaust temperature of the engine can be acquired by receiving data sent by the temperature sensor.
When acquiring the exhaust temperature of the engine, the real-time exhaust temperature of the engine needs to be acquired in order to accurately and timely acquire the condition of the engine. Furthermore, for an application scenario in which the accuracy requirement is not too high, the exhaust temperature of the engine may also be obtained every preset time, for example, every 1 minute. It is easy to understand that the thermal protection effect of collecting the exhaust temperature of the engine once every preset time is not as good as that of collecting the exhaust temperature of the engine in real time.
In the embodiment, the exhaust temperature of the engine can be obtained immediately after the engine is started, so that the exhaust temperature of the engine can be monitored in the whole process. In addition, the exhaust temperature of the engine may be acquired after the engine is started for a certain period of time. Because the exhaust temperature is generally low immediately after the engine is started, real-time monitoring is not required.
S202: and counting the timing time of the exhaust temperature of the engine, wherein the timing time is greater than or equal to a first temperature threshold and less than or equal to a second temperature threshold.
In this embodiment, after the exhaust temperature of the engine is obtained, the magnitude relationship between the exhaust temperature of the engine and a first preset threshold and a second preset threshold is determined, where the second preset threshold is greater than the first preset threshold. The timing is started when the exhaust temperature of the engine is between a first temperature threshold and a second temperature threshold, and the timing is ended when the exhaust temperature of the engine is less than the first temperature threshold or greater than the second temperature threshold. The timing length of time that the exhaust temperature of the engine is between the first temperature threshold and the second temperature threshold is determined according to the timing method. Wherein, the timing duration can be realized by a timer; or, by acquiring a first time for starting timing and a second time for ending timing, a time difference between the first time and the second time is a timing duration.
For example, the first temperature threshold is 400 degrees, the second temperature threshold is 500 degrees, when the exhaust temperature of the engine is 430 degrees, the timing condition is satisfied, the timing is started, and the first timing time is 13: 00, ending timing until the exhaust temperature of the engine is less than 400 degrees or more than 500 degrees, and setting the second timing time to be 13: and 10, the timing duration is 10 minutes.
In this embodiment, the first temperature threshold and the second temperature threshold are not specifically limited, and may be set according to actual situations.
S203: and determining a first torque limiting coefficient of the engine according to the relation between the timing duration and a preset time threshold and the exhaust temperature of the engine.
In this embodiment, after the timing duration is obtained, a relationship between the timing duration and the preset time threshold is determined, where the relationship between the timing duration and the preset time threshold may be that the timing duration is less than or equal to the preset time threshold, or that the timing duration is greater than the preset time threshold. For both cases of the timed interval, different methods may be used to determine the first torque limiting coefficient of the engine.
This is because when the exhaust temperature of the engine is in the interval of the first temperature threshold and the second temperature threshold, the exhaust temperature of the engine is considered to be in an acceptable range, and based thereon, the duration for which the exhaust temperature is in the interval can be judged, and the first torque limiting coefficient of the engine is determined based on the duration.
S204: determining a target torque output of an engine based on the first torque limiting factor and/or a second torque limiting factor for the engine; wherein the second torque limit coefficient of the engine is a torque limit coefficient determined by at least one of a water temperature, an oil temperature, a fuel temperature, and an intake air temperature of the engine.
In the embodiment of the invention, the first torque limit coefficient is determined according to the timing length when the exhaust temperature is in the interval of the first temperature threshold value and the second temperature threshold value, and the second torque limit coefficient is determined according to at least one of the water temperature, the oil temperature, the fuel temperature and the intake air temperature. The target torque output of the engine needs to be determined according to the first torque limiting coefficient and/or the second torque limiting coefficient such that the target torque output of the engine is determined based on at least one of a water temperature, an oil temperature, a fuel temperature, and an intake air temperature of the engine, and/or an exhaust temperature of the engine.
In the present embodiment, the torque limit coefficient of the engine is a value not greater than 1, and the target torque output of the engine is the product of the current torque output of the engine and the torque limit coefficient. For example, if the first torque limiting factor of the engine is determined to be 0.8 and the second torque limiting factor of the engine is determined to be 0.9, then the target torque output of the engine may be determined based on these two factors.
According to the method provided by the embodiment of the invention, on the basis of the existing thermal protection strategy of the engine, the thermal protection control method based on the exhaust temperature of the engine is added, so that the torque limit coefficient of the engine is adjusted, the exhaust temperature of the engine is adjusted, the existing thermal protection method can be perfected, and the problem that the parts around the existing exhaust pipeline are baked is solved.
According to the thermal protection control method provided by the embodiment of the invention, the exhaust temperature of an engine is obtained, the timing duration of the exhaust temperature of the engine which is greater than or equal to a first temperature threshold and less than or equal to a second temperature threshold is counted, a first torque limiting coefficient of the engine is determined according to the relation between the timing duration and a preset time threshold and the exhaust temperature of the engine, the target torque output of the engine is determined according to the first torque limiting coefficient and/or the second torque limiting coefficient of the engine, different first torque limiting coefficients are set according to the difference of the timing duration of the exhaust temperature between the first temperature threshold and the second temperature threshold, the generality is stronger, and the accuracy and the timeliness of the exhaust temperature control can be improved; in addition, the method can flexibly perform thermal protection control according to the exhaust temperature of the engine, and unnecessary power loss can be reduced on the premise of improving the reliability of the engine.
Optionally, determining a target torque output of the engine according to the first torque limiting coefficient and/or a second torque limiting coefficient of the engine comprises:
acquiring an operation mode of an engine; determining a target torque output of the engine according to a second torque limiting coefficient of the engine when the operating mode of the engine is a regeneration mode; determining a target torque output of the engine based on the lesser of the first and second torque limiting coefficients when the operating mode of the engine is not the regeneration mode.
In the embodiment of the invention, the running mode of the engine is also considered, and when the engine is in the preset running mode, the ECU adopts the torque limiting coefficient determined based on at least one of the water temperature, the engine oil temperature, the fuel temperature and the air inlet temperature of the engine. The operating modes of the engine include a normal mode, an SCR (Selective Catalytic Reduction) heating mode, and a regeneration mode, among others. The determination of the different operating modes can be made by means of signals output by sensors of the engine.
The regeneration mode refers to an operation mode in which a chemical reaction for purifying carbon particulate emissions occurs in the diesel particulate filter device, in which the engine needs to inject fuel to increase the temperature of the after-treatment system, and thus the exhaust temperature of the engine increases.
In order not to influence the normal operation of the engine in the regeneration mode, the target output torque of the engine is directly determined according to the second torque limiting coefficient of the engine in the regeneration mode, namely the exhaust temperature of the engine is not considered when the thermal protection control strategy of the engine is executed in the regeneration mode; when the operation mode of the engine is not the regeneration mode, the target torque output of the engine is determined according to the smaller value of the first torque limiting coefficient and the second torque limiting coefficient, namely, when the thermal protection control strategy of the engine is executed in the non-regeneration mode, the exhaust temperature of the engine needs to be considered.
For example, when the engine is in the regeneration mode, the first torque limit factor is 0.8 and the second torque limit factor is 0.9, then the target torque output of the engine is determined to be the product of the current torque output of the engine and the second torque limit factor; accordingly, when the engine is not in the regeneration mode, the first torque limiting factor is 0.8 and the second torque limiting factor is 0.9, the target torque output of the engine is determined as the product of the current torque output of the engine and the first torque limiting factor.
By obtaining the operating mode of the engine and determining the target torque output of the engine based on the second torque limiting factor of the engine when the engine is in the regeneration mode, normal operation of the engine in the regeneration mode can be ensured.
Fig. 3 shows a flowchart of another thermal protection control method provided for the embodiment of the present invention, and on the basis of the above embodiment, S203 includes S2031 and S2032, which are detailed as follows:
s2031: and when the timing duration is less than or equal to a preset time threshold, determining a preset torque limit coefficient as a first torque limit coefficient of the engine.
S2032: and when the timing duration is greater than a preset time threshold, determining a first torque limiting coefficient of the engine according to the exhaust temperature of the engine and a preset mapping relation, wherein the preset mapping relation is a corresponding relation between the exhaust temperature of the engine and the torque limiting coefficient of the engine, and the preset torque limiting coefficient is greater than or equal to the maximum value of the torque limiting coefficient in the preset mapping relation.
In the present embodiment, the first torque restriction coefficient is determined according to the timing length when the exhaust gas temperature of the engine is in the first temperature threshold and the second temperature threshold interval. For the first case, when the timed period is less than or equal to the preset time threshold, the first torque limit coefficient is a preset torque limit coefficient, where the preset torque limit coefficient is a fixed value, and the fixed value is a value of 1. That is, when the timing duration is less than or equal to the preset time threshold, the engine cannot be limited based on the exhaust temperature.
For the second case, when the timing duration is greater than the preset time threshold, in order to avoid the engine being at a higher temperature for a long time, the engine needs to be torque-limited based on the exhaust temperature. In this case, a first torque restriction coefficient of the engine is determined according to an exhaust temperature of the engine and a preset map. Fig. 4 shows a map of exhaust gas temperature versus torque limiting coefficient, as shown in fig. 4, with the horizontal axis representing exhaust gas temperature and the vertical axis representing torque limiting coefficient, which takes a fixed value, which is a value of 1, when the exhaust gas temperature is lower than a first preset threshold value X1; when the exhaust temperature is higher than a first preset threshold value, if the exhaust temperature is X2, the torque limit coefficient Y2 corresponding to the exhaust temperature is taken as a first torque limit coefficient. Wherein the torque limit coefficient is smaller as the exhaust temperature is higher, so that the target torque output is smaller.
For example, when the preset time threshold is 10 minutes, if the timed duration is 8 minutes, the first torque limit coefficient of the engine is a fixed value of 1; if the timed period is 12 minutes, a first torque limiting coefficient is determined according to the exhaust temperature of the engine, and if the exhaust temperature is 450 degrees, a torque limiting coefficient corresponding to the exhaust temperature of 450 degrees is set as the first torque limiting coefficient.
It should be noted that fig. 4 is only an exemplary illustration of the relationship of the torque limiting coefficient decreasing with increasing exhaust temperature, and is not a limitation. In addition, in this embodiment, the preset time threshold and the torque limit coefficients at different temperatures are not specifically limited, and may be set according to actual conditions.
According to the method, different first torque limiting coefficients are set according to different timing durations, so that when the exhaust temperature is at a higher temperature for a short time and at a higher temperature for a long time, different first torque limiting coefficients are set, the output torque of the engine can be adjusted in real time according to the exhaust temperature, and when the exhaust temperature of the engine is at a higher temperature for a short time, potential safety hazards caused by power reduction are avoided.
Optionally, the method further includes:
when the exhaust temperature of the engine is smaller than a first temperature threshold value or larger than a second temperature threshold value, determining a first torque limit coefficient of the engine according to the exhaust temperature of the engine and a preset mapping relation; determining a target torque output of the engine based on the first and/or second torque limiting coefficients.
In the present embodiment, it is also necessary to consider the case where the exhaust temperature of the engine is less than the first temperature threshold value and greater than the second temperature threshold value, for both cases, the first torque restriction coefficient is determined based on the exhaust temperature of the engine and a preset map.
According to fig. 4, the torque limitation factor is a fixed value of 1 when the exhaust gas temperature is less than the first temperature threshold. This is because the exhaust temperature is low at this time, and it is not necessary to limit the torque of the engine based on the exhaust temperature. Therefore, in determining the target torque output of the engine based on the first torque limiting factor and/or the second torque limiting factor, the target torque output may be determined based on the second torque limiting factor.
According to fig. 4, when the exhaust temperature is greater than the first temperature threshold, the torque limiting coefficient decreases with the increase of the exhaust temperature, so when the exhaust temperature of the engine is greater than the second temperature threshold, the torque limiting coefficient also decreases with the increase of the exhaust temperature, and the specific value of the torque limiting coefficient is related to the exhaust temperature. This is because the exhaust temperature is high at this time, and it is necessary to limit the torque of the engine based on the exhaust temperature. And after the first torque limiting coefficient is determined, comparing numerical values of the first torque limiting coefficient and the second torque limiting coefficient, and taking the smaller value as a basis for determining the target torque output.
In the method, the situation that the exhaust temperature is smaller than the first temperature threshold and the exhaust temperature is larger than the second temperature threshold is taken into consideration, the thermal protection control strategy of the engine can be perfected, and the torque limit coefficient is determined to be a fixed value 1 when the exhaust temperature is smaller than the first temperature threshold in the preset mapping relation, so that the torque of the engine cannot be limited based on the exhaust temperature when the exhaust temperature is low. The exhaust temperature can be made to set different torque limiting coefficients under different conditions.
Optionally, the method further includes:
when the exhaust temperature of the engine is between a first temperature threshold and a second temperature threshold and the timing duration is greater than a preset time threshold, sending first alarm information; and/or sending second alarm information when the exhaust temperature of the engine is greater than a second temperature threshold value.
In the embodiment, when the exhaust temperature of the engine is between the first temperature threshold and the second temperature threshold for a long time or the exhaust temperature of the engine is greater than the second temperature threshold, it indicates that the engine is over-warmed for a long time or the current exhaust temperature of the engine is too high. Under the condition, the alarm information CAN be sent to the instrument panel through the CAN bus. Wherein, alarm information can be acousto-optic alarm information, for example, the whole car sends out warning prompt tone and/or the panel board lights up corresponding pilot lamp.
The first alarm information sent when the exhaust temperature of the engine is between the first temperature threshold and the second temperature threshold for a long time and the second alarm information sent when the exhaust temperature of the engine is greater than the second temperature threshold can be different. For example, when the exhaust temperature of the engine is between the first temperature threshold and the second temperature threshold for a long time, the sent alarm information may be that an indicator lamp a is turned on for an instrument panel to send out a first prompt sound; when the exhaust temperature of the engine is greater than the second temperature threshold value, the sent alarm information can light an indicator lamp B for an instrument panel to send out a second prompt sound. The abnormal state of the exhaust temperature of the engine can be determined by a user through setting different alarm information, so that different strategies can be further executed, and the influence on the engine is prevented.
According to the method, the engine can be further thermally protected by setting the alarm information, and the risk of damage to the engine can be reduced when the ECU executes a thermal protection control strategy to cause abnormity.
Optionally, after determining the target torque output of the engine, the method further includes:
and reducing the fuel injection quantity or adjusting the opening of a throttle valve to adjust the torque output of the engine to be the target torque output.
In the embodiment, the torque output of the engine is related to the fuel injection quantity of the engine and the opening degree of the throttle valve, when the torque output of the engine needs to be adjusted, the ECU can directly output a control signal to the fuel injector or the throttle valve, and further adjust the duration of each fuel injection of the fuel injector to adjust the torque output of the engine, or adjust the opening angle of the throttle valve to adjust the torque output of the engine.
The method can adjust the torque output of the engine to the target torque output, so that the exhaust temperature of the engine is reduced, and the risk of damage to the engine is reduced.
Optionally, the exhaust temperature of the engine is a temperature of a sensor upstream of an oxidation catalyst in the aftertreatment system, or the exhaust temperature of the engine is an average of a temperature of a sensor upstream and a temperature of a sensor downstream of an oxidation catalyst in the aftertreatment system.
In this embodiment, the exhaust temperature of the engine may be a value of a temperature sensor near the oxidation catalyst, and since the temperature near the oxidation catalyst is a key for realizing the active regeneration control of the particulate filter device, the temperature near the oxidation catalyst is selected as the exhaust temperature of the engine.
Specifically, temperature sensors may be provided upstream and downstream of the oxidation catalyst, respectively, and the upstream sensor temperature of the oxidation catalyst may be taken as the exhaust gas temperature, or the exhaust gas temperature may be determined based on the upstream sensor temperature and the downstream sensor temperature of the oxidation catalyst. For example, the exhaust gas temperature is determined from the sensor temperature and the corresponding weighting coefficient by taking the average of the upstream sensor temperature and the downstream sensor temperature of the oxidation catalyst, or by setting different weighting coefficients for the upstream sensor temperature and the downstream sensor temperature of the oxidation catalyst.
By determining the exhaust temperature of the engine through the method, the acquired exhaust temperature of the engine can represent the actual condition of the engine, so that the engine is controlled more accurately through the thermal protection control strategy.
According to the embodiment of the invention, different first torque limiting coefficients are set for the exhaust temperature of the engine in the preset interval in a short time and in the preset interval in a long time, so that the torque limiting coefficients can be adjusted according to the real-time change condition of the exhaust temperature, the universality is strong, and the actual requirements under various working conditions can be met; in addition, the method also considers the operation mode of the engine, and different torque limiting coefficients are selected according to the difference of the operation modes of the engine, so that the normal operation of the engine in the regeneration mode can be ensured; when the timing duration is greater than a preset time threshold, the torque limiting coefficient of the engine is reduced along with the increase of the exhaust temperature, so that the torque of the engine is limited when the exhaust temperature of the engine is higher; when the engine is not in the preset temperature range, the first torque limiting coefficient of the engine is determined according to the exhaust temperature and the preset mapping relation, so that the thermal protection control strategy of the engine is perfected; in addition, when the exhaust temperature is in a preset condition, alarm information can be sent to remind a user; reducing the exhaust temperature by adjusting the torque output of the engine to a target torque output; and the acquired exhaust gas temperature is made more accurate by acquiring the temperature near the oxidation catalyst.
Fig. 5 is a flowchart of another thermal protection control method according to an embodiment of the present invention, as shown in fig. 5, the method includes the following steps:
step S501: the exhaust temperature of the engine is obtained.
Step S502: judging whether the exhaust temperature of the engine is between a first temperature threshold and a second temperature threshold, if so, executing a step S503; if not, go to step S506.
Step S503: and acquiring the timing duration.
Step S504: judging whether the timing duration is less than or equal to a preset time threshold or not; if so, step S505 is executed, otherwise, step S506 is executed.
Step S505: determining a preset torque limit coefficient as a first torque limit coefficient of the engine;
step S506: a first torque limiting factor of the engine is determined according to a preset mapping relationship.
Step S507: the operating mode of the engine is obtained.
Step S508: and judging whether the running mode of the engine is a regeneration mode, if so, executing S509, and if not, executing S510.
Step S509: a target torque output of the engine is determined based on the second torque limiting factor.
Step S510: a target torque output of the engine is determined based on the lesser of the first torque limiting coefficient and the second torque limiting coefficient.
For the detailed process implemented by each step, reference may be made to the above-mentioned embodiments, and the implementation principle and technical effect are similar, which are not described herein again.
Fig. 6 is a schematic structural diagram of a thermal protection control device according to an embodiment of the present invention, and as shown in fig. 6, the thermal protection control device 60 according to the embodiment may include: an acquisition module 601, a statistics module 602, and a determination module 603.
An obtaining module 601 is used for obtaining the exhaust temperature of the engine.
The counting module 602 is configured to count a timing duration of the exhaust temperature of the engine, where the exhaust temperature is greater than or equal to a first temperature threshold and less than or equal to a second temperature threshold.
The determining module 603 is configured to determine a first torque limiting coefficient of the engine according to a relationship between the timed period and a preset time threshold and an exhaust temperature of the engine.
The determination module 603 is further configured to determine a target torque output of the engine based on the first torque limiting factor and/or a second torque limiting factor of the engine.
Wherein the second torque limit coefficient of the engine is a torque limit coefficient determined by at least one of a water temperature, an oil temperature, a fuel temperature, and an intake air temperature of the engine.
The thermal protection device provided in the embodiment of the present invention can implement the thermal protection control method according to the embodiment shown in fig. 2, and the implementation principle and the technical effect are similar, which are not described herein again.
Fig. 7 is a schematic hardware structure diagram of a thermal protection device according to an embodiment of the present invention. As shown in fig. 7, the present embodiment provides a thermal protection device 70 including: at least one processor 701 and a memory 702. The processor 701 and the memory 702 are connected by a bus 703.
In a specific implementation process, the at least one processor 701 executes the computer-executable instructions stored in the memory 702, so that the at least one processor 701 executes the thermal protection control method in the above method embodiment.
For a specific implementation process of the processor 701, reference may be made to the above method embodiments, which implement principles and technical effects are similar, and details are not described herein again.
In the embodiment shown in fig. 7, it should be understood that the Processor may be a Central Processing Unit (CPU), other general purpose processors, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), etc. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like. The steps of a method disclosed in connection with the present invention may be embodied directly in a hardware processor, or in a combination of the hardware and software modules within the processor.
The memory may comprise high speed RAM memory, and may also include non-volatile storage NVM, such as at least one disk memory.
The bus may be an Industry Standard Architecture (ISA) bus, a Peripheral Component Interconnect (PCI) bus, an Extended ISA (EISA) bus, or the like. The bus may be divided into an address bus, a data bus, a control bus, etc. For ease of illustration, the buses in the figures of the present application are not limited to only one bus or one type of bus.
The embodiment of the present invention further provides a computer-readable storage medium, where a computer execution instruction is stored in the computer-readable storage medium, and when a processor executes the computer execution instruction, the thermal protection control method according to the above method embodiment is implemented.
The computer-readable storage medium may be implemented by any type of volatile or non-volatile memory device or combination thereof, such as Static Random Access Memory (SRAM), electrically erasable programmable read-only memory (EEPROM), erasable programmable read-only memory (EPROM), programmable read-only memory (PROM), read-only memory (ROM), magnetic memory, flash memory, magnetic or optical disk. Readable storage media can be any available media that can be accessed by a general purpose or special purpose computer.
An exemplary readable storage medium is coupled to the processor such the processor can read information from, and write information to, the readable storage medium. Of course, the readable storage medium may also be an integral part of the processor. The processor and the readable storage medium may reside in an Application Specific Integrated Circuits (ASIC). Of course, the processor and the readable storage medium may also reside as discrete components in the apparatus.
Those of ordinary skill in the art will understand that: all or a portion of the steps of implementing the above-described method embodiments may be performed by hardware associated with program instructions. The program may be stored in a computer-readable storage medium. When executed, the program performs steps comprising the method embodiments described above; and the aforementioned storage medium includes: various media that can store program codes, such as ROM, RAM, magnetic or optical disks.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (9)
1. A thermal protection control method, comprising:
acquiring the exhaust temperature of an engine;
counting the timing duration of the exhaust temperature of the engine, wherein the exhaust temperature of the engine is greater than or equal to a first temperature threshold and less than or equal to a second temperature threshold;
determining a first torque limiting coefficient of the engine according to the relation between the timing duration and a preset time threshold and the exhaust temperature of the engine;
acquiring an operation mode of an engine;
determining a target torque output of the engine according to a second torque limiting coefficient of the engine when the operating mode of the engine is a regeneration mode;
determining a target torque output of the engine according to the smaller of the first torque limiting coefficient and the second torque limiting coefficient when the operating mode of the engine is not the regeneration mode;
wherein the second torque limit coefficient of the engine is a torque limit coefficient determined by at least one of a water temperature, an oil temperature, a fuel temperature, and an intake air temperature of the engine.
2. The method of claim 1, wherein determining a first torque limiting coefficient for the engine based on the relationship of the timed period to a preset time threshold and an exhaust temperature of the engine comprises:
when the timing duration is less than or equal to a preset time threshold, determining a preset torque limit coefficient as a first torque limit coefficient of the engine;
and when the timing duration is greater than a preset time threshold, determining a first torque limiting coefficient of the engine according to the exhaust temperature of the engine and a preset mapping relation, wherein the preset mapping relation is a corresponding relation between the exhaust temperature of the engine and the torque limiting coefficient of the engine, and the preset torque limiting coefficient is greater than or equal to the maximum value of the torque limiting coefficient in the preset mapping relation.
3. The method of claim 1, further comprising:
when the exhaust temperature of the engine is smaller than a first temperature threshold value or larger than a second temperature threshold value, determining a first torque limit coefficient of the engine according to the exhaust temperature of the engine and a preset mapping relation;
determining a target torque output of the engine based on the first and/or second torque limiting coefficients.
4. The method of claim 1, further comprising:
when the exhaust temperature of the engine is between a first temperature threshold and a second temperature threshold and the timing duration is greater than a preset time threshold, sending first alarm information; and/or the presence of a gas in the gas,
and when the exhaust temperature of the engine is greater than a second temperature threshold value, sending second alarm information.
5. The method of any of claims 1-4, after determining the target torque output of the engine, further comprising:
and reducing the fuel injection quantity or adjusting the opening of a throttle valve to adjust the torque output of the engine to be the target torque output.
6. The method according to any one of claims 1-4, characterized in that the exhaust temperature of the engine is the temperature of a sensor upstream of an oxidation catalyst in the aftertreatment system, or the exhaust temperature of the engine is the average of the temperature of a sensor upstream and the temperature of a sensor downstream of an oxidation catalyst in the aftertreatment system.
7. A thermal protection control device, comprising:
the acquisition module is used for acquiring the exhaust temperature of the engine;
the counting module is used for counting the timing duration of the exhaust temperature of the engine, wherein the exhaust temperature of the engine is greater than or equal to a first temperature threshold and less than or equal to a second temperature threshold;
the determining module is used for determining a first torque limiting coefficient of the engine according to the relation between the timing duration and a preset time threshold and the exhaust temperature of the engine;
the acquisition module is further used for acquiring the running mode of the engine;
the determination module is further used for determining a target torque output of the engine according to a second torque limiting coefficient of the engine when the running mode of the engine is a regeneration mode; determining a target torque output of the engine based on the lesser of the first and second torque limiting coefficients when the operating mode of the engine is not a regeneration mode;
wherein the second torque limit coefficient of the engine is a torque limit coefficient determined by at least one of a water temperature, an oil temperature, a fuel temperature, and an intake air temperature of the engine.
8. A thermal protection control device, comprising: at least one processor and memory;
the memory stores computer-executable instructions;
the at least one processor executing computer-executable instructions stored by the memory cause the at least one processor to perform the thermal protection control method of any of claims 1 to 6.
9. A computer-readable storage medium having computer-executable instructions stored thereon which, when executed by a processor, implement the thermal protection control method of any one of claims 1 to 6.
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| CN113107689B (en) * | 2021-05-11 | 2022-10-28 | 潍柴动力股份有限公司 | Vehicle control method, vehicle control device, ECU, storage medium, and program product |
| CN114810371B (en) * | 2021-07-05 | 2023-06-30 | 长城汽车股份有限公司 | Engine power determination method, device, medium and vehicle |
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| US4601270A (en) * | 1983-12-27 | 1986-07-22 | United Technologies Diesel Systems, Inc. | Method and apparatus for torque control of an internal combustion engine as a function of exhaust smoke level |
| JP2000045922A (en) * | 1998-07-28 | 2000-02-15 | Nissan Motor Co Ltd | Internal combustion engine control system |
| US6415761B1 (en) * | 2000-05-11 | 2002-07-09 | Detroit Diesel Corporation | Engine over temperature protection |
| US6457466B1 (en) * | 2000-12-05 | 2002-10-01 | Detroit Diesel Corporation | Method and system for enhanced engine control based on exhaust temperature |
| US7856309B2 (en) * | 2008-09-19 | 2010-12-21 | Gm Global Technology Operations, Inc. | Cold start emission reduction strategy for coordinated torque control systems |
| FR3077341B1 (en) * | 2018-01-26 | 2022-03-18 | Psa Automobiles Sa | SYSTEM AND METHOD FOR CONTROLLING THE REGENERATION OF A VEHICLE PARTICLE FILTER, AND MOTOR VEHICLE INCORPORATING THEM |
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