CN109681335B - Engine thermal protection control method and device - Google Patents

Engine thermal protection control method and device Download PDF

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Publication number
CN109681335B
CN109681335B CN201811571143.2A CN201811571143A CN109681335B CN 109681335 B CN109681335 B CN 109681335B CN 201811571143 A CN201811571143 A CN 201811571143A CN 109681335 B CN109681335 B CN 109681335B
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Prior art keywords
engine
water temperature
temperature threshold
torque
torque limit
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CN109681335A (en
Inventor
樊京元
徐龙
杨秀花
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Weichai Power Co Ltd
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Weichai Power Co Ltd
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/02—Circuit arrangements for generating control signals
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/0002—Controlling intake air
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/22—Safety or indicating devices for abnormal conditions
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/30—Controlling fuel injection
    • F02D41/3005—Details not otherwise provided for
    • 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
    • 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

Abstract

The method is used for setting a first water temperature threshold value and a second water temperature threshold value, wherein the second water temperature threshold value is higher than the first water temperature threshold value, setting a first preset mapping relation for recording a first corresponding relation between the water temperature of an engine and the torque limit ratio of the engine, and setting a second preset mapping relation for recording a second corresponding relation between the water temperature of the engine and the torque limit ratio of the engine. If the obtained water temperature of the engine is larger than or equal to the first water temperature threshold value, timing is started; under the condition that the timing duration is smaller than a preset time threshold, if the water temperature of the engine is larger than or equal to a second water temperature threshold, limiting the torque output of the engine according to a first preset mapping relation; under the condition that the timing duration reaches the preset time threshold, the torque output of the engine is limited according to the second preset mapping relation.

Description

Engine thermal protection control method and device
Technical Field
The invention belongs to the technical field of automobiles, and particularly relates to a thermal protection control method and device for an engine.
Background
The engine thermal protection means that when the water temperature of the engine is too high, a preset temperature reduction measure is triggered, for example, the torque output of the engine is limited, so that the purpose of reducing the temperature of the engine is achieved. The engine is thermally protected, so that the dynamic property and the economical efficiency of the engine can be fully exerted, and the service life of the engine is prolonged.
In the engine thermal protection control method in the prior art, a fixed torque limiting curve is preset before a vehicle leaves a factory, and when the water temperature of an engine is higher than a preset trigger value, the torque output of the engine is limited according to the preset torque limiting curve.
The method adopted by the prior art can not meet the actual use requirements of the vehicle, for example, the water temperature limit value is set to be lower, when the vehicle climbs a slope or overtakes, the water temperature of an engine can rise for a short time, and if the torque limit is triggered at the moment, the dynamic property and the safety of the vehicle can be influenced; if the water temperature limit value is set too high, the engine can work under a high-temperature working condition for a long time, and the service life of the engine is influenced.
Disclosure of Invention
In view of this, the present invention provides an engine thermal protection control method and apparatus, which perform more reasonable overheat protection on an engine to meet the actual use requirement of a vehicle, and the specific scheme is as follows:
in a first aspect, the present invention provides an engine thermal protection control method, comprising:
acquiring the water temperature of an engine in real time;
if the water temperature of the engine is greater than or equal to a first water temperature threshold value, timing is started;
under the condition that the timing duration is smaller than a preset time threshold, if the engine water temperature is larger than or equal to a second water temperature threshold, determining a first engine torque limit proportion corresponding to the engine water temperature according to a first preset mapping relation, so as to limit torque output of the engine according to the first engine torque limit proportion, wherein the second water temperature threshold is higher than the first water temperature threshold, and the first preset mapping relation records a first corresponding relation between the engine water temperature and the engine torque limit proportion when the engine water temperature is larger than or equal to the second water temperature threshold;
and under the condition that the timing duration reaches the preset time threshold, determining a second engine torque limit proportion corresponding to the engine water temperature according to a second preset mapping relation so as to limit the torque output of the engine according to the second engine torque limit proportion, wherein the second preset mapping relation records a second corresponding relation between the engine water temperature and the engine torque limit proportion when the engine water temperature is greater than or equal to the first water temperature threshold.
Optionally, the limiting the torque output of the engine according to the first engine torque limit ratio includes:
determining a target output torque according to the first engine torque limit ratio;
and reducing the fuel injection quantity or controlling the opening of a throttle valve so as to adjust the torque output of the engine to be reduced to the target output torque.
Optionally, for any engine water temperature value, the engine torque limit ratio set by the second preset mapping relationship is lower than the engine torque limit ratio set by the first preset mapping relationship.
Optionally, the engine thermal protection control method provided by the first aspect of the present invention further includes:
and when the water temperature of the engine is greater than a third water temperature threshold value, sending first alarm information, wherein the third water temperature threshold value is lower than the first water temperature threshold value.
Optionally, the engine thermal protection control method provided by the first aspect of the present invention further includes:
and sending second alarm information when the torque output of the engine is limited according to the first preset mapping relation or the torque output of the engine is limited according to the second preset mapping relation.
Optionally, the engine thermal protection control method provided by any one of the first aspect of the present invention further includes:
and when the engine water temperature is lower than the first water temperature threshold value, stopping timing.
Optionally, the engine thermal protection control method provided by any one of the first aspect of the present invention further includes:
releasing engine torque output restriction when the engine water temperature is below the first water temperature threshold.
In a second aspect, the present invention provides an engine thermal protection control apparatus comprising:
an acquisition unit for acquiring an engine water temperature;
the timing unit is used for starting timing if the water temperature of the engine is greater than or equal to a first water temperature threshold value;
the control system comprises a first control unit, a second control unit and a control unit, wherein the first control unit is used for determining a first engine torque limit proportion corresponding to the engine water temperature according to a first preset mapping relation if the engine water temperature is greater than or equal to a second water temperature threshold under the condition that the timing duration is less than a preset time threshold, so as to limit the torque output of the engine according to the first engine torque limit proportion, the second water temperature threshold is higher than the first water temperature threshold, and the first preset mapping relation records a first corresponding relation between the engine water temperature and the engine torque limit proportion when the engine water temperature is greater than or equal to the second water temperature threshold;
and the second control unit is used for determining a second engine torque limit proportion corresponding to the engine water temperature according to a second preset mapping relation under the condition that the timing duration reaches the preset time threshold, so as to limit the torque output of the engine according to the second engine torque limit proportion, wherein the second preset mapping relation records a second corresponding relation between the engine water temperature and the engine torque limit proportion when the engine water temperature is greater than or equal to the first water temperature threshold.
Optionally, the first control unit, when limiting the torque output of the engine according to the first engine torque limit ratio, specifically includes:
determining a target output torque according to the first engine torque limit ratio;
and reducing the fuel injection quantity or controlling the opening of a throttle valve so as to adjust the torque output of the engine to be reduced to the target output torque.
Optionally, the engine thermal protection control device provided by the second aspect of the present invention further includes:
the first alarm information sending unit is used for sending first alarm information when the water temperature of the engine is larger than a third water temperature threshold value, wherein the third water temperature threshold value is lower than the first water temperature threshold value.
Based on the technical scheme, the engine thermal protection control method and the engine thermal protection control device provided by the invention are characterized in that a first water temperature threshold value and a second water temperature threshold value are set, and the second water temperature threshold value is higher than the first water temperature threshold value. Meanwhile, a first preset mapping relation of a first corresponding relation of the engine water temperature and the engine torque limit ratio is recorded when a second water temperature threshold value is used as an initial temperature and the engine water temperature is greater than or equal to the second water temperature threshold value, and a second preset mapping relation of a second corresponding relation of the engine water temperature and the engine torque limit ratio is recorded when the first water temperature threshold value is used as the initial temperature and the engine water temperature is greater than or equal to the first water temperature threshold value.
If the obtained water temperature of the engine is greater than or equal to the first water temperature threshold value, timing is started; and under the condition that the timing duration is less than the preset time threshold, if the water temperature of the engine is continuously increased to be greater than or equal to the second water temperature threshold, determining a first engine torque limit proportion corresponding to the water temperature of the engine according to a first preset mapping relation, and limiting the torque output of the engine according to the first engine torque limit proportion, so that when the water temperature of the engine is higher than a second water temperature limit value, the torque output of the engine is limited, and the water temperature of the engine is prevented from being further increased. And under the condition that the timing duration reaches a preset time threshold, in order to avoid the long-time work of the engine under a high-temperature working condition, determining a second engine torque limiting proportion corresponding to the water temperature of the engine according to a second preset mapping relation with a lower initial temperature setting, and limiting the torque output of the engine according to the second engine torque limiting proportion.
In conclusion, the engine thermal protection control method and the engine thermal protection control device provided by the invention can carry out more reasonable overheating protection on the engine, and meet the actual use requirements of the vehicle.
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 introduced below, and it is obvious that the drawings in the following description are 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 flow chart of a method of engine thermal protection control according to an embodiment of the present invention;
FIG. 2 is an alternative representation of a first predetermined mapping relationship and a second predetermined mapping relationship involved in a method for controlling thermal protection of an engine according to an embodiment of the present invention;
FIG. 3 is a block diagram of an engine thermal protection control apparatus according to an embodiment of the present invention;
fig. 4 is a block diagram of another engine thermal protection control apparatus according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, 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 some, but not all, embodiments of the present invention. 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.
Referring to fig. 1, fig. 1 is a flowchart of an engine thermal protection control method provided by an embodiment of the present invention, where the method may be applied to a vehicle controller or an engine controller to implement overheat protection on an engine, so as to meet actual use requirements of a vehicle; referring to fig. 1, an engine thermal protection control method provided by an embodiment of the present invention may include:
and S100, acquiring the water temperature of the engine in real time.
Optionally, the process of obtaining the water temperature of the engine can be developed immediately after the vehicle is started, so as to ensure that the whole running process of the vehicle can be effectively monitored. Of course, the water temperature may be obtained after the vehicle is started for a certain period of time, and the specific starting time for obtaining the engine water temperature is not limited in the embodiment of the present invention.
In order to ensure that the working condition of the engine can be accurately and timely known, the engine thermal protection control method provided by the embodiment of the invention obtains the water temperature of the engine in real time. Specifically, the engine water temperature sensor can be arranged on a vehicle in the prior art, and the water temperature value of the engine can be obtained by reading the feedback information of the engine water temperature sensor in real time.
Optionally, in an application scenario with low accuracy requirement, it is obvious that the engine water temperature may also be periodically collected, that is, the engine water temperature is read once every preset time interval. It is conceivable that the method of periodically reading the water temperature of the engine will inevitably cause discontinuity of the collected data, and the actual use effect is affected.
Step S110, judging whether the water temperature of the engine is greater than or equal to a first water temperature threshold value, if so, executing step S120; if not, the step S100 is executed.
After the obtained engine water temperature is obtained, it is necessary to further determine whether the obtained engine water temperature is greater than or equal to the first water temperature threshold. If the water temperature of the engine is greater than or equal to the first water temperature threshold value, executing a step S120 and starting timing; if the engine water temperature is smaller than the first water temperature threshold value, the step S100 is continuously executed, and the engine water temperature is obtained.
It should be noted that, as can be seen from the foregoing, the step of acquiring the engine water temperature is performed in real time, and for convenience of describing the flow of the steps of the method in the embodiment of the present application, after determining that the engine water temperature is less than the first preset water temperature threshold, the step S110 is executed, but it is conceivable that the operation of acquiring the engine water temperature is performed in real time and is performed all the time, and the whole execution process of the control method is performed.
Step S120, start timing.
And after the engine water temperature is judged to be greater than or equal to the first water temperature threshold value, timing can be started.
The water temperature of the engine is greater than or equal to the first water temperature threshold, which indicates that the load of the engine is higher when the engine is operated under a condition that the water temperature is higher, and therefore, the working environment of the engine needs to be monitored.
Step S130, determining whether the timing duration is less than a preset time threshold, if so, performing step S140, and if not, performing step S160.
And after timing is started, monitoring the timing duration, and judging whether the timing duration is smaller than a preset time threshold value. The preset time threshold provided by the embodiment of the invention is the limit time for allowing the engine to work under the condition of higher water temperature. Of course, for a given preset time threshold, multiple conditions such as specific conditions, experience, and test data of specific vehicles and engines need to be combined.
Step S140, judging whether the water temperature of the engine is greater than or equal to a second water temperature threshold, if so, executing step S150; if not, the process returns to step S130.
As described above, the step of obtaining the engine water temperature is performed in real time, and when the timing duration is less than the preset time threshold, it is determined whether the engine water temperature is greater than or equal to the second water temperature threshold, and if so, step S150 is executed; if not, the process returns to step S130.
In particular, the second water temperature threshold is higher than the first water temperature threshold. After the start of the timer, the engine water temperature is further increased in many cases, so that when the engine water temperature is continuously increased to be greater than or equal to the second water temperature threshold value, the load of the engine is very heavy, and if the engine is continuously operated, the service life of the engine is influenced.
And S150, determining a first engine torque limit proportion corresponding to the water temperature of the engine according to a first preset mapping relation, and limiting the torque output of the engine according to the first engine torque limit proportion.
And under the condition that the timing duration is less than the preset time threshold, the water temperature of the engine is continuously increased to be greater than or equal to the second water temperature threshold, and at the moment, the torque limit control of the engine is necessary.
Optionally, the engine thermal protection control method provided in the embodiment of the present invention is provided with a first preset mapping relationship, where the first preset mapping relationship takes the second water temperature threshold as an initial temperature, and records a first corresponding relationship between the engine water temperature and the torque limit ratio of the engine when the engine water temperature is greater than or equal to the second water temperature threshold. Specifically, referring to fig. 2, fig. 2 is a selectable expression form of a first preset mapping relationship and a second preset mapping relationship involved in an engine thermal protection control method provided in an embodiment of the present invention, that is, the first preset mapping relationship is expressed in a form of a curve 1, and the curve 1 may record a first corresponding relationship between different engine water temperature values and engine torque limit ratios.
After the water temperature of the engine is obtained, a first engine torque limit proportion corresponding to the water temperature of the engine can be determined according to the first preset mapping relation, and then torque limit control is carried out on the engine according to the first engine torque limit proportion.
Optionally, after the first engine torque limit ratio is determined, a target output torque may be calculated according to the calculated engine required torque output and by combining the first engine torque limit ratio. The calculation process can be realized by the calculation method in the prior art, and details are not described here. After the target output torque is obtained, the fuel injection quantity in the engine cylinder can be reduced or the opening degree of a throttle valve of an air inlet and exhaust system can be controlled, so that the torque output of the engine is adjusted to be reduced to the target output torque. After the torque output of the engine is reduced, the water temperature of the engine is naturally gradually reduced.
It is conceivable that the torque limit control of the engine is not performed if the engine water temperature is not increased to be greater than or equal to the second water temperature threshold value in the case where the counted time period is less than the preset time threshold value.
And S160, determining a second engine torque limit proportion corresponding to the water temperature of the engine according to a second preset mapping relation, and limiting the torque output of the engine according to the second engine torque limit proportion.
It is conceivable that, in the present embodiment, the trigger condition for starting the time counting is that the engine water temperature is greater than or equal to the first water temperature threshold value, that is, the time counting operation continues as long as this condition is satisfied, and therefore, the time counting operation is also performed after the engine water temperature is greater than or equal to the second water temperature threshold value. If the timing duration after the water temperature of the engine is greater than or equal to the first water temperature threshold reaches the preset time threshold, the engine works for a period of time (namely, the duration corresponding to the preset time threshold) under the high water temperature working condition, therefore, under the condition that the timing duration reaches the preset time threshold, a second engine torque limiting proportion corresponding to the water temperature of the engine is further determined according to a second preset mapping relation, and the torque output of the engine is limited according to the second engine torque limiting proportion.
Optionally, the second preset mapping relation takes the first water temperature threshold as an initial temperature, and records a second corresponding relation between the water temperature of the engine and the torque limit ratio of the engine when the water temperature of the engine is greater than or equal to the first water temperature threshold. Specifically, referring to fig. 2, fig. 2 is a selectable expression form of a first preset mapping relationship and a second preset mapping relationship involved in the engine thermal protection control method provided in the embodiment of the present invention, that is, the second preset mapping relationship is expressed in a form of a curve 2, and the curve 2 may record a second corresponding relationship between different engine water temperature values and engine torque limit ratios.
The process of limiting the torque of the engine according to the second preset mapping relationship is the same as the process of limiting the torque of the engine according to the first preset mapping relationship, and details are not repeated here.
It is conceivable that, after the timing duration reaches the preset time threshold, the engine may operate under two working conditions, one of which is that the engine water temperature is greater than or equal to the second water temperature threshold, at this time, the engine is already torque-limited, and the other is that the engine water temperature is between the first water temperature threshold and the second water temperature threshold.
Optionally, after torque limiting control, the temperature of the engine water is inevitably reduced gradually, when the temperature of the engine water is lower than a first water temperature threshold, timing can be stopped, and meanwhile, the torque output limit of the engine is released, so that the engine can respond to the torque demand of a driver by one hundred percent.
In summary, according to the engine thermal protection control method provided by the embodiment of the present invention, under the condition that the timing duration is less than the preset time threshold, if the water temperature of the engine continues to rise to be greater than or equal to the second water temperature threshold, the first engine torque limit ratio corresponding to the water temperature of the engine is determined according to the first preset mapping relationship, and the torque output of the engine is limited according to the first engine torque limit ratio; under the condition that the timing duration reaches the preset time threshold value, in order to avoid the long-time work of the engine under the high-temperature working condition, the second engine torque limiting proportion corresponding to the engine water temperature is determined according to the second preset mapping relation with the set lower initial temperature, and the torque output of the engine is limited according to the second engine torque limiting proportion, so that the problem that the engine water temperature rises in a short time in the vehicle climbing or overtaking process is solved, meanwhile, the long-time work of the engine under the working condition with higher water temperature can be avoided, more reasonable overheating protection is carried out on the engine, and the actual use requirement of the vehicle is met.
Optionally, under the condition that the timing duration reaches the preset time threshold, in order to further accelerate the cooling process of the engine and achieve a better torque control effect, for any engine water temperature value, the engine torque limit proportion determined according to the second preset mapping relation is lower than the engine torque limit proportion determined according to the first preset mapping relation, so that after the engine is subjected to torque limit according to the second preset mapping relation, the cooling effect is more obvious.
Of course, the torque limit ratio of the first predetermined mapping relation and the second predetermined mapping relation may be set in many ways, for example, in an alternative arrangement shown in fig. 2, after the engine water temperature reaches a certain value, the torque limit ratios determined by the first predetermined mapping relation and the second predetermined mapping relation are identical, and the engine water temperature limit value for stopping the engine torque output (i.e. the torque limit ratio is 0%) is also identical. Any setting that can achieve the effect of the first preset mapping relationship and the second preset mapping relationship in the embodiment of the present invention is optional, and also belongs to the protection scope of the present invention.
Optionally, a third water temperature threshold lower than the first water temperature threshold is further set in the embodiment of the present invention, and when the engine water temperature is greater than the third water temperature threshold, first alarm information is sent to remind a driver that the engine water temperature of the vehicle is high, a driving behavior needs to be noticed, and torque output of the engine may be controlled subsequently. Specifically, the first alarm information may be embodied in various forms, such as lighting an indicator light preset on an instrument panel, or sending an alarm sound.
Optionally, when the torque output of the engine is limited according to the first preset mapping relationship, or the torque output of the engine is limited according to the second preset mapping relationship, second warning information may be sent to inform the driver that the torque output of the engine is limited at this time, and the acceleration response may not be sensitive any more, so that a certain psychological expectation is provided for the driver, and meanwhile, the driver is also reminded of needing to adjust the driving behavior or check the vehicle. Similarly, the second alarm information may be embodied in the form of lighting an indicator light preset on an instrument panel, or giving an alarm sound.
The engine thermal protection control device provided by the embodiment of the present invention is introduced below, and the engine thermal protection control device described below may be regarded as a functional module architecture that needs to be set in a central device to implement the engine thermal protection control method provided by the embodiment of the present invention; the following description may be cross-referenced with the above.
Fig. 3 is a block diagram of an engine thermal protection control device according to an embodiment of the present invention, and referring to fig. 3, the device may include:
an acquisition unit 10 for acquiring an engine water temperature;
a timing unit 20, configured to start timing if the engine water temperature is greater than or equal to a first water temperature threshold;
the first control unit 30 is configured to, under the condition that a timing duration is less than a preset time threshold, determine a first engine torque limit ratio corresponding to the engine water temperature according to a first preset mapping relationship if the engine water temperature is greater than or equal to a second water temperature threshold, so as to limit torque output of the engine according to the first engine torque limit ratio, where the second water temperature threshold is higher than the first water temperature threshold, and the first preset mapping relationship records a first corresponding relationship between the engine water temperature and the engine torque limit ratio when the engine water temperature is greater than or equal to the second water temperature threshold;
and the second control unit 40 is configured to determine a second engine torque limit ratio corresponding to the engine water temperature according to a second preset mapping relationship when the timing duration reaches the preset time threshold, so as to limit torque output of the engine according to the second engine torque limit ratio, where the second preset mapping relationship records a second corresponding relationship between the engine water temperature and the engine torque limit ratio when the engine water temperature is greater than or equal to the first water temperature threshold.
Optionally, the first control unit 30 is configured to limit the torque output of the engine according to the first engine torque limit ratio, and specifically includes:
determining a target output torque according to the first engine torque limit ratio;
and reducing the fuel injection quantity or controlling the opening of a throttle valve so as to adjust the torque output of the engine to be reduced to the target output torque.
Optionally, referring to fig. 4, fig. 4 is a block diagram of another engine thermal protection control device provided in the embodiment of the present invention, where the device may include, on the basis of the embodiment shown in fig. 3:
and the first alarm information sending unit 50 is used for sending first alarm information when the water temperature of the engine is greater than a third water temperature threshold value, wherein the third water temperature threshold value is lower than the first water temperature threshold value.
And a second warning information sending unit 60 for sending second warning information when the torque output of the engine is limited according to the first preset mapping relationship, or the torque output of the engine is limited according to the second preset mapping relationship.
A third control unit 70 for stopping the timing when the engine water temperature is lower than the first water temperature threshold.
A fourth control unit 80 for releasing the engine torque output restriction when the engine water temperature is lower than the first water temperature threshold.
Those of skill would further appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, computer software, or combinations of both, and that the various illustrative components and steps have been described above generally in terms of their functionality in order to clearly illustrate this interchangeability of hardware and software. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.
The steps of a method or algorithm described in connection with the embodiments disclosed herein may be embodied directly in hardware, in a software module executed by a processor, or in a combination of the two. A software module may reside in Random Access Memory (RAM), memory, Read Only Memory (ROM), electrically programmable ROM, electrically erasable programmable ROM, registers, hard disk, a removable disk, a CD-ROM, or any other form of storage medium known in the art.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (10)

1. An engine thermal protection control method, characterized by comprising:
acquiring the water temperature of an engine in real time;
if the water temperature of the engine is greater than or equal to a first water temperature threshold value, timing is started;
under the condition that the timing duration is smaller than a preset time threshold, if the engine water temperature is larger than or equal to a second water temperature threshold, determining a first engine torque limit proportion corresponding to the engine water temperature according to a first preset mapping relation, so as to limit torque output of the engine according to the first engine torque limit proportion, wherein the second water temperature threshold is higher than the first water temperature threshold, and the first preset mapping relation records a first corresponding relation between the engine water temperature and the engine torque limit proportion when the engine water temperature is larger than or equal to the second water temperature threshold;
and under the condition that the timing duration reaches the preset time threshold, determining a second engine torque limit proportion corresponding to the engine water temperature according to a second preset mapping relation so as to limit the torque output of the engine according to the second engine torque limit proportion, wherein the second preset mapping relation records a second corresponding relation between the engine water temperature and the engine torque limit proportion when the engine water temperature is greater than or equal to the first water temperature threshold.
2. The engine thermal protection control method of claim 1, wherein said limiting the torque output of the engine in accordance with the first engine torque limit ratio comprises:
determining a target output torque according to the first engine torque limit ratio;
and reducing the fuel injection quantity or controlling the opening of a throttle valve so as to adjust the torque output of the engine to be reduced to the target output torque.
3. The engine thermal protection control method according to claim 1, characterized in that the engine torque limit ratio set by the second preset mapping relationship is lower than the engine torque limit ratio set by the first preset mapping relationship for any engine water temperature value.
4. The engine thermal protection control method according to claim 1, characterized by further comprising:
and when the water temperature of the engine is greater than a third water temperature threshold value, sending first alarm information, wherein the third water temperature threshold value is lower than the first water temperature threshold value.
5. The engine thermal protection control method according to claim 1, characterized by further comprising:
and sending second alarm information when the torque output of the engine is limited according to the first preset mapping relation or the torque output of the engine is limited according to the second preset mapping relation.
6. The engine thermal protection control method according to any one of claims 1-5, characterized by further comprising:
and when the engine water temperature is lower than the first water temperature threshold value, stopping timing.
7. The engine thermal protection control method according to any one of claims 1-5, characterized by further comprising:
releasing engine torque output restriction when the engine water temperature is below the first water temperature threshold.
8. An engine thermal protection control device, comprising:
an acquisition unit for acquiring an engine water temperature;
the timing unit is used for starting timing if the water temperature of the engine is greater than or equal to a first water temperature threshold value;
the control system comprises a first control unit, a second control unit and a control unit, wherein the first control unit is used for determining a first engine torque limit proportion corresponding to the engine water temperature according to a first preset mapping relation if the engine water temperature is greater than or equal to a second water temperature threshold under the condition that the timing duration is less than a preset time threshold, so as to limit the torque output of the engine according to the first engine torque limit proportion, the second water temperature threshold is higher than the first water temperature threshold, and the first preset mapping relation records a first corresponding relation between the engine water temperature and the engine torque limit proportion when the engine water temperature is greater than or equal to the second water temperature threshold;
and the second control unit is used for determining a second engine torque limit proportion corresponding to the engine water temperature according to a second preset mapping relation under the condition that the timing duration reaches the preset time threshold, so as to limit the torque output of the engine according to the second engine torque limit proportion, wherein the second preset mapping relation records a second corresponding relation between the engine water temperature and the engine torque limit proportion when the engine water temperature is greater than or equal to the first water temperature threshold.
9. The engine thermal protection control device according to claim 8, wherein the first control unit, when limiting the torque output of the engine according to the first engine torque limit ratio, specifically comprises:
determining a target output torque according to the first engine torque limit ratio;
and reducing the fuel injection quantity or controlling the opening of a throttle valve so as to adjust the torque output of the engine to be reduced to the target output torque.
10. The engine thermal protection control device according to claim 8, characterized in that the device further comprises:
the first alarm information sending unit is used for sending first alarm information when the water temperature of the engine is larger than a third water temperature threshold value, wherein the third water temperature threshold value is lower than the first water temperature threshold value.
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