CN113090401B - Engine torque compensation method and system and automobile - Google Patents
Engine torque compensation method and system and automobile Download PDFInfo
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- CN113090401B CN113090401B CN202110336291.1A CN202110336291A CN113090401B CN 113090401 B CN113090401 B CN 113090401B CN 202110336291 A CN202110336291 A CN 202110336291A CN 113090401 B CN113090401 B CN 113090401B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/02—Circuit arrangements for generating control signals
- F02D41/04—Introducing corrections for particular operating conditions
- F02D41/06—Introducing corrections for particular operating conditions for engine starting or warming up
- F02D41/062—Introducing corrections for particular operating conditions for engine starting or warming up for starting
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B63/00—Adaptations of engines for driving pumps, hand-held tools or electric generators; Portable combinations of engines with engine-driven devices
- F02B63/04—Adaptations of engines for driving pumps, hand-held tools or electric generators; Portable combinations of engines with engine-driven devices for electric generators
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B67/00—Engines characterised by the arrangement of auxiliary apparatus not being otherwise provided for, e.g. the apparatus having different functions; Driving auxiliary apparatus from engines, not otherwise provided for
- F02B67/04—Engines characterised by the arrangement of auxiliary apparatus not being otherwise provided for, e.g. the apparatus having different functions; Driving auxiliary apparatus from engines, not otherwise provided for of mechanically-driven auxiliary 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
- F02D13/00—Controlling the engine output power by varying inlet or exhaust valve operating characteristics, e.g. timing
- F02D13/02—Controlling the engine output power by varying inlet or exhaust valve operating characteristics, e.g. timing during engine operation
- F02D13/0261—Controlling the valve overlap
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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
- F02D45/00—Electrical control not provided for in groups F02D41/00 - F02D43/00
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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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- 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
- F02D2200/1006—Engine torque losses, e.g. friction or pumping losses or losses caused by external loads of accessories
Abstract
The invention provides an engine torque compensation method and system and an automobile, and is applied to the technical field of automobile control. In the engine torque compensation method provided by the invention, the torque margin under different compensation measure combinations can be predicted according to the priority of each torque compensation measure, then, according to the torque margin prediction result when at least one torque compensation measure is applied, the optimal torque compensation measure or the optimal torque compensation measure combination is selected as a final torque compensation scheme, and the final torque compensation scheme is implemented before the load consumes the engine torque, so that the engine torque can meet the engine torque requirement of the load after the load intervention, and the problem of engine speed drop and even flameout caused by insufficient small-displacement engine torque is avoided.
Description
Technical Field
The invention relates to the technical field of automobile control, in particular to an engine torque compensation method and system and an automobile.
Background
With the increasing strictness of fuel consumption regulations of passenger cars, small-displacement engines are increasingly favored by wide automobile manufacturers. However, because small displacement engines can provide less maximum torque, insufficient torque from the engine is likely to occur when a load is placed on the engine, which in turn can cause the engine to drop in speed or even stall. In addition, in a plateau environment where the atmospheric pressure is low, the idle maximum intake air amount of the engine is reduced; and at a high load in a high temperature environment, the basic ignition angle of the engine is also reduced by correction of knock control. The external factors can further reduce the maximum torque of the engine at idle speed, so that the problems of insufficient engine torque, drop of the engine speed and even flameout of the engine are solved when the load is inserted into the engine.
To address this problem, the prior art generally employs three torque compensation measures to compensate for the torque of the engine: first, the idling speed of the engine is increased, second, the valve overlap angle is increased by a variable valve timing technique, and third, the generator is restricted from generating electricity or the air conditioner is prohibited from being used. However, with constant power, the idle speed of the engine is increased, although the required torque of the air conditioner and the generator can be reduced. However, after the idling speed of the engine is increased, the torque required by the torque converter increases rapidly with the increase of the rotational speed of the engine, so that the problem of insufficient engine torque can be solved by adopting the first torque compensation measure when only the torque of the air conditioner and the torque of the generator are required, but the problem of drop of the rotational speed of the engine can be aggravated when the idling speed is increased when the torque is simultaneously consumed by the torque converter. The second torque compensation measure is adopted to increase the valve overlap angle through the variable valve timing technology, so that the problem that the idling speed of the engine is unstable and the variable valve timing control can be activated only after the water temperature is high is solved. The third torque compensation measure is adopted to limit the power generation of the generator or inhibit the air conditioner, although the torque demand of the hydraulic torque converter is ensured to be preferentially satisfied when the vehicle starts by reducing the load demand of the engine. However, if the generator is limited for too long, the battery is damaged, and if the air conditioner is prohibited from being started for a long time, the comfort and the window defrosting are affected.
In addition, besides the problems of the three torque compensation measures described above, all the three torque compensation measures in the prior art are deactivated after the drop problem of the engine speed occurs, so that the torque compensation measures in the prior art can only relieve the problem of the drop of the engine speed after the drop of the engine speed, but cannot eliminate the problem of even flameout of the drop of the engine speed due to insufficient torque available to the engine when a load is introduced into the engine.
Disclosure of Invention
The invention aims to provide an engine torque compensation method, an engine torque compensation system and an automobile, which are used for solving the problems that the prior art cannot eliminate the problem that the engine speed drops or even stalls due to insufficient torque available by an engine when a load is introduced into the engine.
In order to solve the above technical problem, the present invention provides an engine torque compensation method, including:
determining a load that is about to intervene and produce an engine torque demand;
respectively carrying out torque margin prediction on the condition that no torque compensation measures are adopted and at least one torque compensation measure is adopted after the load intervention;
And when the torque margin when no torque compensation measures are predicted to be incapable of meeting the requirement, according to the torque margin prediction result when at least one torque compensation measure is applied, applying the corresponding torque compensation measure or the combination of a plurality of torque compensation measures before the load consumes the engine torque, so that the engine torque can meet the engine torque requirement after the load intervention.
Optionally, when it is predicted that the torque margin when no torque compensation measures cannot meet the demand, according to the result of the torque margin prediction when various torque compensation measures or various combinations of torque compensation measures are applied, an optimal torque compensation measure or an optimal combination of torque compensation measures may be selected as a final torque compensation scheme, and the final torque compensation scheme is implemented before the load consumes the engine torque, so that the engine torque can meet the engine torque demand of the load after the load intervention.
Alternatively, all of the torque compensation measures may be ordered in order of priority from high to low; the step of predicting the torque margin after the load intervention in the case of applying at least one torque compensation measure, respectively, may include:
Firstly, predicting a torque margin under the condition of applying the torque compensation measure with the highest priority;
if the predicted torque margin meets the requirement, taking the torque compensation measure with the highest priority as the final torque compensation scheme;
if the predicted torque margin does not meet the requirement, sequentially superposing the torque compensation measures with corresponding priority on the torque compensation measure with the highest priority according to the sequence from high priority to low priority, predicting the torque margin after superposing the torque compensation measures with corresponding priority, judging whether the predicted torque margin can meet the requirement or not, and until a torque compensation measure combination with the predicted torque margin capable of meeting the requirement is found, thereby obtaining the final torque compensation scheme.
Alternatively, if the result of the torque margin prediction when various torque compensation measures or a combination of various torque compensation measures are applied cannot meet the demand, the load intervention may be temporarily not allowed.
Alternatively, the engine may be an engine of an automobile, and the load to be interposed may be a torque converter or an air conditioner on the automobile; when the load to be intervened is a hydraulic torque converter, if the result of torque margin prediction when various torque compensation measures or the combination of various torque compensation measures are applied cannot meet the requirement, a driver of the automobile can be further reminded of stepping on the accelerator to start so as to allow the hydraulic torque converter to intervene; when the load to be intervened is an air conditioner, if the result of the torque margin prediction when various torque compensation measures or the combination of various torque compensation measures are applied cannot meet the requirement, the driver of the automobile can be further reminded that the air conditioner cannot be started currently.
Alternatively, when the load is a torque converter, the applied one of the torque compensation measures may be increasing a valve overlap angle, limiting a generator consumption torque, or prohibiting an air conditioner consumption torque, and the applied combination of the torque compensation measures may include a superposition of at least two of increasing a valve overlap angle, limiting a generator consumption torque, and prohibiting an air conditioner consumption torque;
when the load is an air conditioner, the one of the torque compensation measures applied may be to increase an engine idle speed, increase a valve overlap angle, or limit a generator consumption torque, and the combination of the torque compensation measures applied may include a superposition of at least two of increasing an engine idle speed, increasing a valve overlap angle, and limiting a generator consumption torque.
Optionally, the step of predicting a torque margin for limiting the torque consumed by the generator after the load intervention may include: according to the current magnitude of the battery power, engine torque which can be released after the power generator consumes torque is limited to different degrees is predicted.
In a second aspect, based on the engine torque compensation method as described above, the present invention further provides an engine torque compensation system, including:
an intervention load determination module for determining a load that is about to be interposed and that generates an engine torque demand;
The torque margin prediction module is used for respectively predicting the torque margin under the conditions of no torque compensation measure and at least one torque compensation measure after the load intervention;
and the torque compensation measure applying module is used for applying corresponding torque compensation measures or a combination of a plurality of torque compensation measures before the load consumes the engine torque according to the torque margin prediction result when at least one torque compensation measure is applied when the torque margin when no torque compensation measure is predicted to be incapable of meeting the requirement, so that the engine torque can meet the engine torque requirement after the load intervention.
Optionally, the torque compensation measure applying module may specifically be configured to: when the torque margin when no torque compensation measures are predicted to be unable to meet the requirement, selecting the optimal torque compensation measure or the optimal combination of the torque compensation measures as a final torque compensation scheme according to the result of the torque margin prediction when various torque compensation measures or the combination of various torque compensation measures are applied, and implementing the final torque compensation scheme before the load consumes the engine torque so that the engine torque can meet the engine torque requirement of the load after the load intervention.
Optionally, all the torque compensation measures are ordered in order of priority from high to low; the torque margin prediction module may include:
the torque margin prediction unit is used for predicting the torque margin under the condition of applying the torque compensation measure with the highest priority;
a torque compensation scheme determining unit, configured to take the torque compensation measure with the highest priority as the final torque compensation scheme if the predicted torque margin meets the requirement; if the predicted torque margin does not meet the requirement, sequentially superposing the torque compensation measures with corresponding priority on the torque compensation measure with the highest priority according to the sequence from high priority to low priority, predicting the torque margin after superposing the torque compensation measures with corresponding priority, judging whether the predicted torque margin can meet the requirement or not, and until a torque compensation measure combination with the predicted torque margin capable of meeting the requirement is found, thereby obtaining the final torque compensation scheme.
Optionally, the torque compensation system of the engine may further include:
and the load intervention prohibition module is used for temporarily disallowing the load intervention if the result of the torque margin prediction when various torque compensation measures or various torque compensation measures are applied cannot meet the requirement.
Alternatively, the engine may be an engine of an automobile, and the load to be interposed may be a torque converter or an air conditioner on the automobile; the load intervention prohibition module may specifically be used for: when the load to be intervened is a hydraulic torque converter, if the result of torque margin prediction when various torque compensation measures or the combination of various torque compensation measures are applied cannot meet the requirement, a driver of the automobile can be further reminded of stepping on the accelerator to start so as to allow the hydraulic torque converter to intervene; when the load to be intervened is an air conditioner, if the result of the torque margin prediction when various torque compensation measures or the combination of various torque compensation measures are applied cannot meet the requirement, the driver of the automobile can be further reminded that the air conditioner cannot be started currently.
Alternatively, when the load is a torque converter, the applied one of the torque compensation measures may be increasing a valve overlap angle, limiting a generator consumption torque, or prohibiting an air conditioner consumption torque, and the applied combination of the torque compensation measures may include a superposition of at least two of increasing a valve overlap angle, limiting a generator consumption torque, and prohibiting an air conditioner consumption torque;
When the load is an air conditioner, the one of the torque compensation measures applied may be to increase an engine idle speed, increase a valve overlap angle, or limit a generator consumption torque, and the combination of the torque compensation measures applied may include a superposition of at least two of increasing an engine idle speed, increasing a valve overlap angle, and limiting a generator consumption torque.
Optionally, in the step of predicting the torque margin for the situation of limiting the torque consumed by the generator after the load intervention, the torque margin prediction module may specifically be configured to: according to the current magnitude of the battery power, engine torque which can be released after the power generator consumes torque is limited to different degrees is predicted.
In a third aspect, based on the engine torque compensation system as described above, the present invention also provides an automobile comprising an engine, a generator, at least one load, and the engine torque compensation system as described above.
Compared with the prior art, the technical scheme of the invention has at least one of the following beneficial effects:
in the engine torque compensation method provided by the invention, the torque margin under different compensation measure combinations can be predicted according to the priority of each torque compensation measure, then, according to the torque margin prediction result when at least one torque compensation measure is applied, the optimal torque compensation measure or the optimal torque compensation measure combination is selected as a final torque compensation scheme, and the final torque compensation scheme is implemented before the load consumes the engine torque, so that the engine torque can meet the engine torque requirement of the load after the load intervention, and the problem of engine speed drop and even flameout caused by insufficient small-displacement engine torque is avoided.
Furthermore, the engine torque compensation method adopted by the invention can effectively ensure that the most proper torque compensation measures are adopted under the current working condition, thereby avoiding the excessive use of the torque compensation measures, and further meeting the requirements of safety of other parts of the automobile, economy of the engine idle speed and comfort of an automobile driver on the premise of ensuring that the idle speed of the engine is safe.
Drawings
FIG. 1 is a flow chart of an engine torque compensation method according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of an engine torque compensation system according to an embodiment of the present invention.
Detailed Description
Specific embodiments of the present invention will be described in more detail below with reference to the drawings. The advantages and features of the present invention will become more apparent from the following description. It should be noted that the drawings are in a very simplified form and are all to a non-precise scale, merely for convenience and clarity in aiding in the description of embodiments of the invention.
As described in the background art, aiming at the technical problem that the torque provided by the engine is insufficient when the load is introduced into the small-displacement engine, and the engine speed drops or even stalls, the following three torque compensation measures are generally adopted in the prior art to compensate the torque of the engine: first, the idling speed of the engine is increased, second, the valve overlap angle is increased by a variable valve timing technique, and third, the generator is restricted from generating electricity or the air conditioner is prohibited from being used. However, with constant power, the idle speed of the engine is increased, although the required torque of the air conditioner and the generator can be reduced. However, after the idling speed of the engine is increased, the torque required by the torque converter increases rapidly with the increase of the rotational speed of the engine, so that the problem of insufficient engine torque can be solved by adopting the first torque compensation measure when only the torque of the air conditioner and the torque of the generator are required, but the problem of drop of the rotational speed of the engine can be aggravated when the idling speed is increased when the torque is simultaneously consumed by the torque converter. The second torque compensation measure is adopted to increase the valve overlap angle through the variable valve timing technology, so that the problem that the idling speed of the engine is unstable and the variable valve timing control can be activated only after the water temperature is high is solved. The third torque compensation measure is adopted to limit the power generation of the generator or inhibit the air conditioner, although the torque demand of the hydraulic torque converter is ensured to be preferentially satisfied when the vehicle starts by reducing the load demand of the engine. However, if the generator is limited for too long, the battery is damaged, and if the air conditioner is prohibited from being started for a long time, the comfort and the window defrosting are affected.
In addition, besides the problems of the three torque compensation measures described above, all the three torque compensation measures in the prior art are deactivated after the drop problem of the engine speed occurs, so that the torque compensation measures in the prior art can only relieve the problem of the drop of the engine speed after the drop of the engine speed, but cannot eliminate the problem of even flameout of the drop of the engine speed due to insufficient torque available to the engine when a load is introduced into the engine.
Based on the above background, the present general inventive concept predicts whether the engine is sufficiently selecting the optimal torque compensation measure or the combination of the optimal torque compensation measures as the final torque compensation scheme according to the priority of a certain torque compensation measure just before the load is interposed but the engine torque is not actually consumed, and makes the engine torque meet the engine torque demand of the load after the load intervention.
Therefore, the invention provides an engine torque compensation method, an engine torque compensation system and an automobile, which are used for solving the problems that the prior art cannot eliminate the problem that the engine speed drops or even stalls due to insufficient torque provided by the engine when a load is introduced into the engine, and are respectively described in detail below.
An engine torque compensation method provided by an embodiment of the present invention will be described first.
Referring to fig. 1, fig. 1 is a flowchart of an engine torque compensation method according to an embodiment of the present invention, as shown in fig. 1, the method may include the following steps:
step S100 determines the load that is about to be interposed and that is generating the engine torque demand.
Typically, the engine may be an automotive engine, and thus, for an engine in an embodiment of the present invention, the components that typically place a torque demand on the engine are composed of four parts, namely, engine internal resistance, torque converter, air conditioner, and generator. The internal resistance of the engine is determined by the hardware of the engine, so that the torque value required to be consumed cannot be changed. The torque requirement of the hydraulic torque converter is calculated according to parameters such as the speed difference of the turbine rotating speed and the engine rotating speed of the hydraulic torque converter when a driver shifts into gear or starts to drive, and the required torque is required to be preferentially ensured; the torque requirement of the generator is used for charging the storage battery and consuming electricity of the electric appliance, the torque requirement can be temporarily reduced when the electric quantity of the storage battery is high, and the power generation is limited when the electric quantity is low, so that the power feeding of the battery can be caused; the air conditioner is used as a comfort requirement, and can be temporarily cut off if the torque is insufficient when starting.
It should be noted that, based on the function of the generator in the vehicle configuration, the generator is in operation as long as the vehicle is started, i.e., torque is always required to be obtained from the engine. Therefore, when the present invention determines the load to be interposed and that generates the engine torque demand, it is only necessary to determine whether the load to be interposed is a torque converter or an air conditioner on the vehicle.
The researchers of the invention find that when the automobile is in neutral gear, the speed ratio of the turbine rotating speed and the engine rotating speed of the hydraulic torque converter is close to 1, namely, the torque consumed by the hydraulic torque converter is very small and even zero; while the torque consumed by the torque converter increases rapidly as the speed ratio decreases when the driver is engaged or started. That is, when the ratio of the turbine speed and the engine speed of the torque converter is reduced below a threshold value and the turbine speed reduction rate of the torque converter is greater than the turbine speed reduction rate threshold value of the torque converter at which torque is to be generated, for example, 200nm/s, 300nm/s, 350nm/s, 400nm/s, etc., it is considered that the torque converter actually consumes torque, and when the ratio of the turbine speed and the engine speed of the torque converter is 1 or more, the torque converter does not consume torque. Thus, the turbine speed reduction rate of the torque converter and the ratio of the turbine speed to the engine speed of the torque converter can be used to predict whether the torque converter is about to produce a torque demand, i.e., is about to load the engine.
The threshold value of the speed ratio of the turbine speed and the engine speed of the hydraulic torque converter can be 0.5, 0.7, 0.8, 0.85 and the like.
For air conditioning, a time interval is usually provided between when the vehicle controller VCU detects that the driver sends an air conditioning request command through the sensor and when the air conditioning controller ECU controls the air conditioning compressor to actually engage, for example, 0.5s, 1s, 1.5s, and 2s, and the precondition for the air conditioning compressor to engage is that the air conditioning request command is required, so whether the air conditioning request command is sent or not can be used to predict whether the air conditioning compressor is about to generate a torque demand, that is, whether the load of the engine is about to be engaged.
Specifically, in an embodiment of the present invention, the step of determining the load that is about to be interposed and that generates the engine torque demand may include:
acquiring a speed ratio of the turbine rotating speed of the hydraulic torque converter to the rotating speed of the engine and a turbine rotating speed reducing rate of the hydraulic torque converter, and simultaneously detecting whether an air conditioner request instruction is received or not; if the speed ratio of the turbine rotating speed of the hydraulic torque converter to the rotating speed of the engine is between a threshold value and 1, the turbine rotating speed decreasing speed of the hydraulic torque converter is larger than the threshold value, and the air conditioner request instruction is not received at the same time, determining that the load to be inserted into the engine is the hydraulic torque converter; and if the speed ratio of the turbine rotating speed of the hydraulic torque converter to the rotating speed of the engine is more than or equal to 1 and the air conditioner request instruction is received at the same time, determining that the load of the engine to be intervened is an air conditioner.
And step S200, respectively carrying out torque margin prediction on the condition of no torque compensation measure and at least one torque compensation measure after the load intervention.
In this embodiment, after determining the load that is about to intervene and generate the torque demand of the engine in step S100, it is possible to predict the torque margin when the engine does not take any torque compensation measure and the torque value that is about to be generated by the torque converter after the load intervention, and determine whether the torque margin when the engine does not take any torque compensation measure is greater than the torque value that is about to be generated by the torque converter; if yes, the current engine is indicated to allow intervention of the hydraulic torque converter. If not, it is stated that the torque value available to the current engine cannot meet the torque value required by the load to be interposed, and therefore, a corresponding torque compensation measure needs to be applied to the engine. In particular, what kind of torque compensation measures are required to be applied, the torque margin predicted value of the load to be intervened and the engine after at least one kind of preset torque compensation measures are required to be determined.
Specifically, the invention provides a determination mode for predicting torque margin when an engine does not apply any torque compensation measures after the load intervention, which specifically comprises the following steps:
And subtracting the maximum torque value when the engine is idling from the actual torque value when the engine internal resistance, the hydraulic torque converter, the generator and the air conditioner consume the torque of the engine, wherein the specific formula is as follows:
T 1 ＝T EngIdleTrqMax -T englos -T AC -T CONV -T ALT
wherein T is 1 T is the torque margin of the engine when no torque compensation measures are taken EngIdleTrqMax Is the original maximum torque of the engine at idle speed, T englos Torque actually consumed by internal resistance of engine, T AC Torque actually consumed by air conditioner compressor, T CONV T is the torque actually consumed by the hydraulic torque converter ALT Is the torque actually consumed by the generator.
The formula for predicting the torque value to be generated by the load provided by the invention is specifically as follows:
when the load is a torque converter, a formula for calculating a predicted torque required by the torque converter if the torque converter is interposed to an engine is:
T preCONV ＝N engstation ×F oil ×C max
wherein T is preCONV N is the predicted torque of the hydraulic torque converter engstation For target idling of engine, F oil Correction coefficient for torque consumption oil temperature of hydraulic torque converter, C max Maximum value of rotation speed ratio of hydraulic torque converter;
when the load is an air conditioner, calculating a predicted torque required by the air conditioner if the air conditioner is intervened in the engine, wherein the predicted torque required by the air conditioner is calculated by the formula:
Wherein T is preAC For predicting torque of air conditioner, P preAC Is the power of the air conditioner, N engAC Is the engine speed.
In addition, the invention provides a calculation mode of the torque compensation predicted value of the engine after at least one torque compensation measure is applied, which is specifically as follows:
and subtracting the predicted engine torque value after at least one torque compensation measure is applied from the actual torque value when the engine internal resistance, the hydraulic torque converter, the generator and the air conditioner consume the torque of the engine.
Further, the present invention provides a method for predicting a torque margin in the case of applying at least one torque compensation measure after the intervention of the load, which specifically includes the following steps:
firstly, predicting a torque margin under the condition of applying a torque compensation measure with the highest priority;
secondly, if the predicted torque margin meets the requirement, taking the torque compensation measure with the highest priority as the final torque compensation scheme; if the predicted torque margin does not meet the requirement, sequentially superposing the torque compensation measures with corresponding priority on the torque compensation measure with the highest priority according to the sequence from high priority to low priority, predicting the torque margin after superposing the torque compensation measures with corresponding priority, judging whether the predicted torque margin can meet the requirement or not, and until a torque compensation measure combination with the predicted torque margin capable of meeting the requirement is found, thereby obtaining the final torque compensation scheme.
It should be noted that, because the torque converter and the air conditioner are different in functions in the automobile, the torque demand priority of the torque converter is higher than that of the air conditioner, and the torque consumption of the torque converter cannot be limited for the air conditioner. Thus, the type of torque compensation scheme that is selected is different for different loads that are about to intervene and generate an engine torque demand. In particular, when the load that is about to intervene and generate the engine torque demand is a torque converter, the one of the torque compensation measures applied may be increasing a valve overlap angle, limiting generator consumption torque, or prohibiting air conditioner consumption torque, and the combination of the torque compensation measures applied may include a superposition of at least two of increasing a valve overlap angle, limiting generator consumption torque, and prohibiting air conditioner consumption torque; when the load that is about to be interposed and that generates an engine torque demand is an air conditioner, the one of the torque compensation measures applied may be to increase engine idle speed, increase valve overlap angle, or limit generator consumption torque, and the combination of the applied torque compensation measures includes superposition of at least two of increasing engine idle speed, increasing valve overlap angle, and limiting generator consumption torque.
In this embodiment, for different loads, each torque compensation measure applicable to the load may be set to a priority, and all the torque compensation measures may be ordered in order of priority from high to low. And then, starting from the torque compensation measure with the highest priority, judging whether a predicted value of the torque margin after the torque compensation measure with the highest priority is applied to the engine is larger than a predicted torque value to be generated by the load, and if so, judging that the predicted torque margin meets the requirement, and taking the torque compensation measure with the highest priority as the final torque compensation scheme. If the predicted value of the torque margin after the torque compensation measures with the highest priority are applied to the engine is not larger than the predicted value of the torque to be generated by the load, and the predicted torque margin does not meet the requirement, judging whether the predicted value of the torque margin of the torque compensation measure with the next priority with the priority being inferior to the highest priority meets the requirement or not until a torque compensation measure combination with the predicted torque margin meeting the requirement is found, thereby obtaining the final torque compensation scheme. If the result of the torque margin prediction at the time of applying various torque compensation measures or various combinations of torque compensation measures cannot meet the demand, the load intervention is temporarily not allowed.
For example, if the load that is about to be interposed and generates the engine torque demand is a torque converter, determining whether a predicted torque margin value of the engine after the highest priority torque compensation measure is applied to increase the valve overlap angle is greater than a predicted torque value that is about to be generated by the torque converter, if so, increasing the valve overlap angle before the torque converter consumes the engine torque so that the engine torque can meet the engine torque demand of the torque converter; if not, judging whether the predicted value of the torque margin after the valve overlap angle is increased and the torque consumed by the generator is limited by the engine is larger than the predicted value of the torque converter to be generated, if so, increasing the valve overlap angle and limiting the torque consumed by the generator before the torque of the engine is consumed by the torque converter; if not, judging whether the predicted value of the torque margin after the valve overlap angle is increased and the air conditioner is forbidden to consume torque of the engine is larger than the predicted torque value to be generated by the hydraulic torque converter or not if not, if so, the valve overlap angle is increased and the air conditioner is forbidden to consume torque before the torque of the engine is consumed by the hydraulic torque converter; if not, judging whether a torque margin predicted value of the engine, which is used for increasing a valve overlap angle and limiting the consumption torque of the generator and prohibiting the consumption torque of the air conditioner, is larger than a predicted torque value to be generated by the hydraulic torque converter or not if not, if yes, increasing the valve overlap angle and limiting the consumption torque of the generator and prohibiting the consumption torque of the air conditioner before the torque of the engine is consumed by the hydraulic torque converter, and if not, prompting a driver of the automobile to start by stepping on an accelerator so as to allow intervention of the hydraulic torque converter.
Optionally, the step of predicting a torque margin for limiting the generator consumption torque after the load intervention may include: according to the current magnitude of the battery power, engine torque which can be released after the power generator consumes torque is limited to different degrees is predicted.
In summary, in the embodiment of the present invention, when the load is a torque converter, the priorities of the torque compensation measures that can be applied by the load are, in order from high to low: increasing the valve overlap angle, increasing the valve overlap angle and limiting the generator consumption torque, increasing the valve overlap angle and prohibiting the air conditioner consumption torque, increasing the valve overlap angle and limiting the generator consumption torque and prohibiting the air conditioner consumption torque.
It will be appreciated that when the load is a torque converter, increasing the torque compensation measure of the idle speed only increases the torque demand of the torque converter, and therefore not increasing the idle speed can be used as a torque compensation measure that can be applied immediately before the torque converter is interposed in the engine.
Similarly, in the embodiment of the present invention, when the load is an air conditioner, the priorities of the torque compensation measures that can be applied are, in order from high to low: increasing engine idle speed, increasing valve overlap angle, increasing engine idle speed and limiting generator torque consumption, increasing valve overlap angle and limiting generator torque consumption, increasing engine idle speed and increasing valve overlap angle and limiting generator torque consumption.
In this embodiment, when the load is an air conditioner, the method of predicting the torque margin after intervention thereof in the absence of a torque compensation measure and in the case of applying at least one torque compensation measure is the same as the method of the load being a hydrodynamic torque converter as described above, and will not be described in detail herein.
When the load to be interposed is an air conditioner, if the result of the torque margin prediction when various torque compensation measures or the combination of various torque compensation measures are applied cannot meet the requirement, the driver of the automobile can be further reminded that the air conditioner cannot be started currently.
And step S300, when the torque margin when no torque compensation measures are predicted to be unable to meet the requirement, according to the torque margin prediction result when at least one torque compensation measure is applied, applying the corresponding torque compensation measure or the combination of a plurality of torque compensation measures before the load consumes the engine torque, so that the engine torque can meet the engine torque requirement after the load intervention.
In this embodiment, the torque margin under different combinations of compensation measures may be predicted according to the priority of each torque compensation measure, and then, according to the predicted result of the torque margin when at least one of the torque compensation measures is applied, the optimal torque compensation measure or the combination of the optimal torque compensation measures is selected as the final torque compensation scheme, and the final torque compensation scheme is implemented before the load consumes the engine torque, so that the engine torque can meet the engine torque requirement of the load after the load intervention, thereby avoiding the problem of drop or even stall of the engine speed due to insufficient torque of the small-displacement engine.
Based on the same technical concept, corresponding to the method embodiment shown in fig. 1, the embodiment of the present invention further provides an engine torque compensation system, as shown in fig. 2, including:
an intervention load determination module 210 for determining a load that is about to be interposed and that generates an engine torque demand;
a torque margin prediction module 220, configured to perform torque margin prediction on the condition that the load is interposed and at least one torque compensation measure is applied after the load is interposed, respectively;
and the torque compensation measure applying module 230 is configured to apply a corresponding torque compensation measure or a combination of multiple torque compensation measures before the load consumes the engine torque according to the predicted torque margin result when at least one torque compensation measure is applied when the torque margin when no torque compensation measure is predicted to be unable to meet the requirement, so that the engine torque can meet the engine torque requirement after the load intervention.
Optionally, the torque compensation measure applying module 230 may specifically be configured to: when the torque margin when no torque compensation measures are predicted to be unable to meet the requirement, selecting the optimal torque compensation measure or the optimal combination of the torque compensation measures as a final torque compensation scheme according to the result of the torque margin prediction when various torque compensation measures or the combination of various torque compensation measures are applied, and implementing the final torque compensation scheme before the load consumes the engine torque so that the engine torque can meet the engine torque requirement of the load after the load intervention.
Optionally, all the torque compensation measures are ordered in order of priority from high to low; the torque margin prediction module may include:
the torque margin prediction unit is used for predicting the torque margin under the condition of applying the torque compensation measure with the highest priority;
a torque compensation scheme determining unit, configured to take the torque compensation measure with the highest priority as the final torque compensation scheme if the predicted torque margin meets the requirement; if the predicted torque margin does not meet the requirement, sequentially superposing the torque compensation measures with corresponding priority on the torque compensation measure with the highest priority according to the sequence from high priority to low priority, predicting the torque margin after superposing the torque compensation measures with corresponding priority, judging whether the predicted torque margin can meet the requirement or not, and until a torque compensation measure combination with the predicted torque margin capable of meeting the requirement is found, thereby obtaining the final torque compensation scheme.
Optionally, the engine torque compensation system provided by the present invention may further include:
and the load intervention prohibition module is used for temporarily disallowing the load intervention if the result of the torque margin prediction when various torque compensation measures or various torque compensation measures are applied cannot meet the requirement.
Alternatively, the engine may be an engine of an automobile, and the load to be interposed may be a torque converter or an air conditioner on the automobile; the load intervention prohibition module may specifically be used for: when the load to be intervened is a hydraulic torque converter, if the predicted result of torque margin cannot meet the requirement when various torque compensation measures or various torque compensation measures are applied or the combination of the various torque compensation measures, further reminding a driver of the automobile to start by stepping on the accelerator so as to allow the hydraulic torque converter to intervene; when the load to be intervened is an air conditioner, if the result of the torque margin prediction when various torque compensation measures or the combination of various torque compensation measures are applied cannot meet the requirement, further reminding the driver of the automobile that the air conditioner cannot be started currently.
Optionally, when the load is a hydraulic torque converter, one of the torque compensation measures applied is to increase a valve overlap angle, limit a generator consumption torque, or prohibit an air conditioner consumption torque, and the combination of the torque compensation measures applied may include a superposition of at least two of the valve overlap angle, the limit the generator consumption torque, and the prohibit the air conditioner consumption torque;
When the load is an air conditioner, one of the torque compensation measures applied is to increase the engine idle speed, increase the valve overlap angle, or limit the generator consumption torque, and the combination of the applied torque compensation measures may include a superposition of at least two of increasing the engine idle speed, increasing the valve overlap angle, and limiting the generator consumption torque.
Optionally, in the step of predicting the torque margin for the situation of limiting the torque consumed by the generator after the load intervention, the torque margin prediction module may specifically be configured to: according to the current magnitude of the battery power, engine torque which can be released after the power generator consumes torque is limited to different degrees is predicted.
Furthermore, based on the engine torque compensation system as described above, the invention provides an automobile, wherein the automobile can comprise an engine, a generator, at least one load and the engine torque compensation system as described above.
In summary, in the engine torque compensation method provided by the invention, the torque margin under different compensation measure combinations can be predicted according to the priority of each torque compensation measure, then, according to the torque margin prediction result when at least one torque compensation measure is applied, the optimal torque compensation measure or the optimal torque compensation measure combination is selected as the final torque compensation scheme, and the final torque compensation scheme is implemented before the load consumes the engine torque, so that the engine torque can meet the engine torque requirement of the load after the load intervention, and the problem of engine speed drop or even flameout caused by insufficient small-displacement engine torque is avoided.
Furthermore, the engine torque compensation method adopted by the invention can effectively ensure that the most proper torque compensation measures are adopted under the current working condition, thereby avoiding the excessive use of the torque compensation measures, and further meeting the requirements of safety of other parts of the automobile, economy of the engine idle speed and comfort of an automobile driver on the premise of ensuring that the idle speed of the engine is safe.
The embodiment of the invention also provides an electronic device, which comprises a processor, a communication interface, a memory and a communication bus, wherein the processor, the communication interface and the memory are communicated with each other through the communication bus,
a memory for storing a computer program;
and the processor is used for realizing the engine torque compensation method provided by the embodiment of the invention when executing the program stored in the memory.
In addition, other implementation manners of an engine torque compensation method implemented by the processor executing the program stored in the memory are the same as those mentioned in the foregoing method embodiment section, and will not be described herein again.
The communication bus mentioned by the control terminal may be a peripheral component interconnect standard (Peripheral Component Interconnect, PCI) bus or an extended industry standard architecture (Extended Industry StandardArchitecture, EISA) bus, etc. The communication bus may be classified as an address bus, a data bus, a control bus, or the like. For ease of illustration, the figures are shown with only one bold line, but not with only one bus or one type of bus.
The communication interface is used for communication between the electronic device and other devices.
The Memory may include random access Memory (RandomAccess Memory, RAM) or may include Non-Volatile Memory (NVM), such as at least one disk Memory. Optionally, the memory may also be at least one memory device located remotely from the aforementioned processor.
The processor may be a general-purpose processor, including a central processing unit (Central Processing Unit, CPU), a network processor (Network Processor, NP), etc.; but also digital signal processors (Digital Signal Processing, DSP), application specific integrated circuits (Application Specific Integrated Circuit, ASIC), field-Programmable gate arrays (FPGA) or other Programmable logic devices, discrete gate or transistor logic devices, discrete hardware components.
In yet another embodiment of the present invention, a computer readable storage medium having instructions stored therein that when run on a computer cause the computer to perform the engine torque compensation method of any of the above embodiments is also provided.
In the above embodiments, it may be implemented in whole or in part by software, hardware, firmware, or any combination thereof. When implemented in software, may be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions. When loaded and executed on a computer, produces a flow or function in accordance with embodiments of the present invention, in whole or in part. The computer may be a general purpose computer, a special purpose computer, a computer network, or other programmable apparatus. The computer instructions may be stored in or transmitted from one computer-readable storage medium to another, for example, by wired (e.g., coaxial cable, optical fiber, digital Subscriber Line (DSL)), or wireless (e.g., infrared, wireless, microwave, etc.). The computer readable storage medium may be any available medium that can be accessed by a computer or a data storage device such as a server, data center, etc. that contains an integration of one or more available media. The usable medium may be a magnetic medium (e.g., floppy Disk, hard Disk, magnetic tape), an optical medium (e.g., DVD), or a semiconductor medium (e.g., solid State Disk (SSD)), etc.
It is noted that relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
In this specification, each embodiment is described in a related manner, and identical and similar parts of each embodiment are all referred to each other, and each embodiment mainly describes differences from other embodiments. In particular, for apparatus, electronic devices, and computer-readable storage medium embodiments, the description is relatively simple, as it is substantially similar to method embodiments, with reference to portions of the description of method embodiments being relevant.
The foregoing description is only of the preferred embodiments of the present invention and is not intended to limit the scope of the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention are included in the protection scope of the present invention.
Claims (11)
1. An engine torque compensation method, comprising:
determining a load that is about to intervene and produce an engine torque demand;
respectively carrying out torque margin prediction on the condition that no torque compensation measures are adopted and at least one torque compensation measure is adopted after the load intervention;
when the torque margin when no torque compensation measures are predicted to be incapable of meeting the requirement, according to the torque margin prediction result when at least one torque compensation measure is applied, applying the corresponding torque compensation measure or the combination of a plurality of torque compensation measures before the load consumes the engine torque, so that the engine torque can meet the engine torque requirement after the load intervention;
wherein all the torque compensation measures are ordered according to the order of priority from high to low;
and the step of predicting the torque margin after the load intervention in the case of applying at least one torque compensation measure comprises the following steps:
Firstly, predicting a torque margin under the condition of applying the torque compensation measure with the highest priority;
if the predicted torque margin meets the requirement, taking the torque compensation measure with the highest priority as a final torque compensation scheme;
if the predicted torque margin does not meet the requirement, sequentially superposing the torque compensation measures with corresponding priority on the torque compensation measure with the highest priority according to the sequence from high priority to low priority, predicting the torque margin after superposing the torque compensation measures with corresponding priority, judging whether the predicted torque margin can meet the requirement or not, and until a torque compensation measure combination with the predicted torque margin capable of meeting the requirement is found, thereby obtaining a final torque compensation scheme.
2. The engine torque compensation method according to claim 1, characterized in that the load intervention is temporarily not allowed if the result of the torque margin prediction when various torque compensation measures or a combination of various torque compensation measures are applied cannot meet the demand.
3. The engine torque compensation method of claim 2, wherein the engine is an engine of an automobile, and the load to be interposed is a torque converter or an air conditioner on the automobile; when the load to be intervened is a hydraulic torque converter, if the predicted result of torque margin cannot meet the requirement when various torque compensation measures or various torque compensation measures are applied or the combination of the various torque compensation measures, further reminding a driver of the automobile to start by stepping on the accelerator so as to allow the hydraulic torque converter to intervene; when the load to be intervened is an air conditioner, if the result of the torque margin prediction when various torque compensation measures or the combination of various torque compensation measures are applied cannot meet the requirement, further reminding the driver of the automobile that the air conditioner cannot be started currently.
4. The engine torque compensation method of claim 3, wherein when said load is a torque converter, one of said torque compensation measures applied is increasing a valve overlap angle, limiting generator consumption torque, or disabling air conditioner consumption torque, and a combination of torque compensation measures applied includes a superposition of at least two of increasing a valve overlap angle, limiting generator consumption torque, and disabling air conditioner consumption torque;
when the load is an air conditioner, one of the torque compensation measures applied is to increase the engine idle speed, increase the valve overlap angle, or limit the generator consumption torque, and the combination of the applied torque compensation measures includes a superposition of at least two of increasing the engine idle speed, increasing the valve overlap angle, and limiting the generator consumption torque.
5. The engine torque compensation method of claim 4, wherein the step of predicting a torque margin for limiting generator torque consumption after the load intervention comprises: according to the current magnitude of the battery power, engine torque which can be released after the power generator consumes torque is limited to different degrees is predicted.
6. An engine torque compensation system, comprising:
An intervention load determination module for determining a load that is about to be interposed and that generates an engine torque demand;
the torque margin prediction module is used for respectively predicting the torque margin under the conditions of no torque compensation measure and at least one torque compensation measure after the load intervention;
a torque compensation measure applying module, configured to apply a corresponding torque compensation measure or a combination of multiple torque compensation measures before the load consumes the engine torque according to a torque margin prediction result when at least one torque compensation measure is applied when it is predicted that the torque margin when no torque compensation measure cannot meet the requirement, so that the engine torque can meet the engine torque requirement after the load intervention;
wherein all the torque compensation measures are ordered according to the order of priority from high to low; and the torque margin prediction module includes:
the torque margin prediction unit is used for predicting the torque margin under the condition of applying the torque compensation measure with the highest priority;
a torque compensation scheme determining unit, configured to take the torque compensation measure with the highest priority as a final torque compensation scheme if the predicted torque margin meets the requirement; if the predicted torque margin does not meet the requirement, sequentially superposing the torque compensation measures with corresponding priority on the torque compensation measure with the highest priority according to the sequence from high priority to low priority, predicting the torque margin after superposing the torque compensation measures with corresponding priority, judging whether the predicted torque margin can meet the requirement or not, and until a torque compensation measure combination with the predicted torque margin capable of meeting the requirement is found, thereby obtaining a final torque compensation scheme.
7. The system of claim 6, wherein the system further comprises:
and the load intervention prohibition module is used for temporarily disallowing the load intervention if the result of the torque margin prediction when various torque compensation measures or various torque compensation measures are applied cannot meet the requirement.
8. The system of claim 7, wherein the engine is an engine of an automobile and the load to be interposed is a torque converter or an air conditioner on the automobile; the load intervention prohibition module is specifically configured to: when the load to be intervened is a hydraulic torque converter, if the predicted result of torque margin cannot meet the requirement when various torque compensation measures or various torque compensation measures are applied or the combination of the various torque compensation measures, further reminding a driver of the automobile to start by stepping on the accelerator so as to allow the hydraulic torque converter to intervene; when the load to be intervened is an air conditioner, if the result of the torque margin prediction when various torque compensation measures or the combination of various torque compensation measures are applied cannot meet the requirement, further reminding the driver of the automobile that the air conditioner cannot be started currently.
9. The system of claim 8, wherein,
When the load is a hydraulic torque converter, one of the torque compensation measures applied by the torque compensation measure application module is to increase a valve overlap angle, limit generator consumption torque or inhibit air conditioner consumption torque, and the combination of the torque compensation measures applied by the torque compensation measure application module comprises superposition of at least two of the valve overlap angle, the generator consumption torque and the air conditioner consumption torque;
when the load is an air conditioner, one of the torque compensation measures applied by the torque compensation measure applying module is to increase the engine idle speed, increase the valve overlap angle or limit the generator consumption torque, and the combination of the torque compensation measures applied by the torque compensation measure applying module includes superposition of at least two of the engine idle speed, the valve overlap angle and the generator consumption torque.
10. The system of claim 9, wherein the torque margin prediction module is specifically configured to: and predicting the engine torque which can be released after the power generator is limited to consume the torque to different degrees according to the current magnitude of the battery electric quantity, so as to realize the torque margin prediction on the condition of limiting the power generator to consume after the load is interposed.
11. An automobile comprising an engine, a generator, at least one load, and the engine torque compensation system of any one of claims 6-10.
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| US6308671B1 (en) * | 2000-09-11 | 2001-10-30 | Delphi Technologies, Inc. | Method of increasing torque and/or reducing emissions by varying the timing of intake and/or exhaust valves |
| US8406954B2 (en) * | 2008-05-02 | 2013-03-26 | GM Global Technology Operations LLC | Air conditioning torque compensation energy matching inertia transfer |
| US8527120B2 (en) * | 2009-12-10 | 2013-09-03 | GM Global Technology Operations LLC | Method and apparatus for controlling a powertrain system including an engine and electro-mechanical transmission |
| US9086026B2 (en) * | 2012-12-13 | 2015-07-21 | GM Global Technology Operations LLC | System and method for controlling torque output of an engine when a water pump coupled to the engine is switched on or off |
| CN106800019B (en) * | 2015-11-20 | 2019-11-01 | 上海汽车集团股份有限公司 | A kind of control method of HCU and torque compensation |
| CN112441006B (en) * | 2019-08-28 | 2022-03-18 | 比亚迪股份有限公司 | Engine torque compensation method, whole vehicle driving system and hybrid vehicle |
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