CN114320627A - Vehicle diesel engine control method and device - Google Patents
Vehicle diesel engine control method and device Download PDFInfo
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- CN114320627A CN114320627A CN202210049298.XA CN202210049298A CN114320627A CN 114320627 A CN114320627 A CN 114320627A CN 202210049298 A CN202210049298 A CN 202210049298A CN 114320627 A CN114320627 A CN 114320627A
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- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
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Abstract
The application discloses a method and a device for controlling a vehicle diesel engine, wherein the method comprises the following steps: responding to the triggering operation of the vehicle, and acquiring the price of diesel oil and the price of urea; according to the price of diesel oil and the price of urea, obtaining a target original row of the engine through a mapping relation between the original row of the engine and an effective diesel oil consumption rate and a urea consumption rate, wherein the effective diesel oil consumption rate is the diesel oil consumption amount of the engine outputting fixed power in unit time, and the urea consumption rate is the urea consumption amount of the engine outputting fixed power in unit time; and adjusting the control mode of the engine to the control mode corresponding to the target original row. The price of diesel oil and the price of urea are obtained in real time, and the original row of the engine is adjusted in real time according to the price of the diesel oil and the price of the urea, so that the proportion of the diesel oil and the urea consumed by the engine changes along with the change of the price of the diesel oil and the price of the urea, the overall economy of a vehicle diesel engine is improved, and the total cost consumed by the diesel engine during working is lower.
Description
Technical Field
The application relates to the field of vehicles, in particular to a method and a device for controlling a vehicle diesel engine.
Background
The major costs of diesel engines in operation include the cost of diesel fuel for combustion by diesel engines and the cost of urea for reducing harmful gases (NOx) in the exhaust gases of vehicles. When diesel in a diesel engine is burned sufficiently, the engine exhaust is degraded, and the engine needs to consume more urea for reducing vehicle exhaust gas, so that the vehicle exhaust gas meets the standard. When diesel combustion in a diesel engine is less than adequate, the engine consumes less urea, but the engine needs to consume more diesel for the same function.
In the current vehicles, the overall diesel economy of the vehicle diesel engine is roughly considered, so that the vehicle diesel engine has poor economy and higher total cost consumed when the diesel engine works.
Disclosure of Invention
In order to solve the technical problem, the application provides a vehicle diesel engine control method and device.
In order to achieve the above purpose, the technical solutions provided in the embodiments of the present application are as follows:
the embodiment of the application provides a control method of a vehicle diesel engine, which comprises the following steps:
responding to the triggering operation of the vehicle, and acquiring the price of diesel oil and the price of urea;
according to the diesel price and the urea price, obtaining a target original row of the engine through a mapping relation between the original row of the engine and an effective diesel consumption rate and a urea consumption rate, wherein the effective diesel consumption rate is the diesel consumption of the engine outputting fixed power in unit time, and the urea consumption rate is the urea consumption of the engine outputting fixed power in unit time;
and adjusting the control mode of the engine to the control mode corresponding to the target original row.
As a possible implementation, the obtaining of the diesel price and the urea price in response to the trigger operation includes:
when an Electronic Control Unit (ECU) of a vehicle is started, the price of diesel oil and the price of urea are obtained.
As a possible implementation, the obtaining a target bank of an engine includes:
a target emission is obtained that minimizes the sum of the diesel cost and the urea cost of the engine.
As a possible embodiment, the adjusting the control mode of the engine to the control mode corresponding to the target original rank includes:
and adjusting the main injection advance angle, the rail pressure set value and the exhaust gas recirculation EGR rate of the engine to the main injection advance angle, the rail pressure set value and the exhaust gas recirculation EGR rate corresponding to the target original line.
As a possible embodiment, the acquiring the diesel price and the urea price in response to a trigger operation of the vehicle includes:
responding to the triggering operation of the vehicle, an Electronic Control Unit (ECU) of the vehicle sends a price information request to a vehicle-mounted networking terminal T-box;
and the electronic control unit receives the price information sent by the vehicle-mounted networking terminal and acquires the price of diesel oil and the price of urea.
As a possible implementation, the method further includes:
the electronic control unit judges whether the diesel price is in a preset diesel price interval or not and judges whether the urea price is in a preset urea price interval or not;
and when the diesel price is not in the preset diesel price interval and/or the urea price is not in the preset urea price interval, the electronic control unit sends a price information request to the vehicle-mounted networking terminal again.
As a possible implementation, the method further includes:
when the number of times of price information requests continuously transmitted to the vehicle network system by the electronic control unit exceeds a preset threshold, the electronic control unit does not transmit price information requests to the vehicle network system any more.
As a possible embodiment, before adjusting the control mode of the engine to the control mode corresponding to the target original rank, the method further includes:
and confirming the state of the engine to be capable of adjusting the original row.
The embodiment of the present application further provides a vehicle diesel engine control device, including:
the price acquisition module is used for responding to the triggering operation of the vehicle and acquiring the price of diesel oil and the price of urea;
the target original row obtaining module is used for obtaining a target original row of the engine through a mapping relation between the original row of the engine and an effective diesel consumption rate and a urea consumption rate according to the diesel price and the urea price, wherein the effective diesel consumption rate is the diesel consumption amount of the engine outputting fixed power in unit time, and the urea consumption rate is the urea consumption amount of the engine outputting fixed power in unit time;
and the control mode switching module is used for adjusting the control mode of the engine to the control mode corresponding to the target original row.
As a possible implementation manner, the price obtaining module is specifically configured to:
when an Electronic Control Unit (ECU) of a vehicle is started, the price of diesel oil and the price of urea are obtained.
According to the technical scheme, the method has the following beneficial effects:
the embodiment of the application provides a control method of a vehicle diesel engine, which comprises the following steps: responding to the triggering operation of the vehicle, and acquiring the price of diesel oil and the price of urea; according to the price of diesel oil and the price of urea, obtaining a target original row of the engine through a mapping relation between the original row of the engine and an effective diesel oil consumption rate and a urea consumption rate, wherein the effective diesel oil consumption rate is the diesel oil consumption amount of the engine outputting fixed power in unit time, and the urea consumption rate is the urea consumption amount of the engine outputting fixed power in unit time; and adjusting the control mode of the engine to the control mode corresponding to the target original row.
Therefore, the vehicle diesel engine control method provided by the embodiment of the application can be used for adjusting the original rank of the engine according to the diesel oil price and the urea price in real time by acquiring the diesel oil price and the urea price in real time, so that the proportion of the diesel oil and the urea consumed by the engine is changed along with the change of the diesel oil price and the urea price, the overall economy of the vehicle diesel engine is improved, and the total cost consumed by the diesel engine during working is lower.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be 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 application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a flow chart of a method for controlling a vehicle diesel engine provided in an embodiment of the present application;
FIG. 2 is a logic diagram of a diesel price and urea price request provided by an embodiment of the present application;
FIG. 3 is a logic diagram of an enable condition provided by an embodiment of the present application;
FIG. 4 is a logic diagram of a rank adjustment provided by an embodiment of the present application;
fig. 5 is a schematic diagram of a control device of a vehicle diesel engine according to an embodiment of the present application.
Detailed Description
In order to help better understand the scheme provided by the embodiment of the present application, before describing the method provided by the embodiment of the present application, a scenario of an application of the scheme of the embodiment of the present application is described.
The major costs of diesel engines in operation include the cost of diesel fuel for combustion by diesel engines and the cost of urea for reducing harmful gases (NOx) in the exhaust gases of vehicles. When diesel in a diesel engine is burned sufficiently, the engine exhaust is degraded, and the engine needs to consume more urea for reducing vehicle exhaust gas, so that the vehicle exhaust gas meets the standard. When diesel combustion in a diesel engine is less than adequate, the engine consumes less urea, but the engine needs to consume more diesel for the same function.
In the current vehicles, consideration of the overall diesel economy of the vehicle diesel engine is rough. For example, there is a large fluctuation in the price of diesel and urea during vehicle use. However, when the price of diesel oil and the price of urea fluctuate, the proportion of diesel oil and urea consumed by the diesel engine does not change, so that the proportion of diesel oil and urea consumed by the diesel engine of the vehicle is not adaptive to the price of diesel oil and the price of urea, and the total cost consumed by the diesel engine during working is higher.
The embodiment of the application provides a control method of a vehicle diesel engine, which comprises the following steps: responding to the triggering operation of the vehicle, and acquiring the price of diesel oil and the price of urea; according to the price of diesel oil and the price of urea, obtaining a target original row of the engine through a mapping relation between the original row of the engine and an effective diesel oil consumption rate and a urea consumption rate, wherein the effective diesel oil consumption rate is the diesel oil consumption amount of the engine outputting fixed power in unit time, and the urea consumption rate is the urea consumption amount of the engine outputting fixed power in unit time; and adjusting the control mode of the engine to the control mode corresponding to the target original row.
Therefore, the control method of the vehicle diesel engine provided by the embodiment of the application can be used for adjusting the target original rank of the engine according to the diesel oil price and the urea price in real time by acquiring the diesel oil price and the urea price in real time, so that the proportion of the diesel oil and the urea consumed by the engine is changed along with the change of the diesel oil price and the urea price, the overall economy of the vehicle diesel engine is improved, and the total cost consumed by the diesel engine during working is lower.
In order to make the aforementioned objects, features and advantages of the present application more comprehensible, embodiments accompanying the drawings are described in detail below.
Referring to fig. 1, a flowchart of a control method for a vehicle diesel engine according to an embodiment of the present application is shown.
As shown in fig. 1, a control method for a vehicle diesel engine according to an embodiment of the present application includes:
s101: in response to a triggering operation of the vehicle, a diesel price and a urea price are obtained.
It should be noted that, in the embodiment of the present application, the triggering operation in response to the vehicle may be a starting operation of an Electronic Control Unit (ECU) of the vehicle, that is, when the ECU is powered on, the ECU obtains a diesel price and a urea price. As another possible implementation manner, the ECU may also obtain the diesel price and the urea price through other operation triggers, or the ECU may obtain the diesel price and the urea price at regular time, which is not limited herein.
Specifically, in response to a triggering operation with the vehicle, the electronic control unit ECU of the vehicle may send a price information request to the in-vehicle networking terminal T-box; and the electronic control unit receives the price information sent by the vehicle-mounted networking terminal to obtain the price of the diesel oil and the price of the urea. Further, the electronic control unit can judge whether the diesel price is in a preset diesel price interval or not and judge whether the urea price is in a preset urea price interval or not; and when the diesel price is not in the preset diesel price interval and/or the urea price is not in the preset urea price interval, the electronic control unit sends a price information request to the vehicle-mounted networking terminal again. And the electronic control unit does not send the price information request to the vehicle network system any more until the frequency of the price information requests continuously sent to the vehicle network system by the electronic control unit exceeds a preset threshold value.
The acquisition of diesel fuel prices and urea prices by the ECU in the embodiment of the present application will be described below with a specific strength.
Referring to fig. 2, a logic diagram of a diesel price and urea price request provided by an embodiment of the present application is shown.
As shown in fig. 2, the ECU sends a data request (price information request) at each initialization, and after receiving the data request sent by the ECU, a vehicle-mounted networking terminal (Telematics BOX, T-BOX) feeds back a diesel price and a urea price to the ECU in the form of a message. And when the ECU does not receive the price information fed back by the T-box, adding 1 to the request frequency, and the ECU sends a data request to the T-box again until the request frequency exceeds a preset threshold value, and then the current T-box is considered to have a fault or abnormal communication, and the request data is not sent to the T-box any more. And after the ECU receives the diesel price and the urea price, judging whether the diesel price and the urea price fed back by the T-box are reasonable or not. And when the ECU judges that the diesel oil price and the urea price are reasonable, the data request is sent to the T-box. And when the ECU judges that the price of the diesel oil and/or the price of the urea are unreasonable, adding 1 to the request times, and sending a data request to the T-box again by the ECU until the request times exceed a preset threshold, considering that the current T-box has a fault or is abnormal in communication, and not sending request data to the T-box any more.
S102: and obtaining the target original row of the engine according to the price of the diesel oil and the price of the urea through the mapping relation between the original row of the engine and the consumption rate of the effective diesel oil and the consumption rate of the urea.
The effective diesel consumption rate is a diesel consumption amount by which the engine outputs a fixed power per unit time, and the urea consumption rate is a urea consumption amount by which the engine outputs a fixed power per unit time. As a possible embodiment, the ECU may obtain a target original rank that is the lowest in sum of the diesel cost and the urea cost of the engine through a mapping relationship of the original rank of the engine with the effective diesel consumption rate and the urea consumption rate according to the diesel price and the urea price. It should be noted that the price of urea and the price of diesel in the embodiment of the present application are only two main conditions that affect the cost, and in practical applications, other affecting conditions may be added to obtain the target original rank of the engine, and the embodiment of the present application is not limited herein.
The method of constructing a specific cost function is as follows:
constructing a cost function:
C＝Pfuel*Vfuel+Purea*Vurea (1)
wherein C is the cost, PfuelPrice of diesel oil, VfuelIs the volume of diesel, PureaIs the price of urea, VureaIs the urea volume.
VureaCan be approximated as
Wherein NOxReferring to the engine bank, then equation (1) can be rewritten as:
the deformation is as follows:
here VfuleIs original NOxFunction of (2)
Wherein W is the work done by the engine, bsfc is the effective diesel consumption, ρfuelIs the density of diesel oil. Equation (2) can be rewritten as:
or
As can be seen from equation (3) or equation (4), the operating cost of the engine is a function of the engine emissions given the known diesel and urea prices. The ECU in the embodiment of the application can deduce the engine original rank corresponding to the lowest cost according to the price of diesel oil and the price of urea.
S103: and adjusting the control mode of the engine to the control mode corresponding to the target original row.
Before adjusting the control mode of the engine to the control mode corresponding to the target original line, the method may further include: and confirming the state of the engine to be capable of adjusting the original row.
Referring to fig. 3, a logic diagram of an enable condition according to an embodiment of the present application is provided.
As shown in fig. 3, the enabling conditions are determined before the control mode of the engine is adjusted to the control mode corresponding to the target original line, and the control mode of the engine is adjusted (original line adjustment) only when all the enabling conditions are satisfied. Specifically, the enabling conditions include the following:
(a) the engine running mode is a normal mode, and the original row adjustment is not carried out in other modes;
(b) the environmental pressure is smaller than an environmental pressure threshold value, so that the discharge standard exceeding under extreme conditions is prevented;
(c) the temperature of the engine is smaller than the temperature threshold of the engine, so that the system degradation caused by the abnormal operation temperature of the engine due to the adjustment of the original bank is prevented;
(d) the engine operation working condition is a common working condition point, the engine operates stably under the working condition, the emission limit margin is large, and the transient working condition is small;
(e) no relevant fault downgrade request;
(f) the running mileage of the engine is smaller than the mileage threshold value, and the standard exceeding of the original emission is prevented after the engine parts are degraded.
As a possible embodiment, adjusting the control mode of the engine to the control mode corresponding to the target original rank includes: and adjusting the main injection advance angle, the rail pressure set value and the exhaust gas recirculation EGR rate of the engine to the main injection advance angle, the rail pressure set value and the exhaust gas recirculation EGR rate corresponding to the target original line.
Referring to fig. 4, a logic diagram of an inline adjustment according to an embodiment of the present application is shown.
As shown in fig. 4, according to the prices of diesel and urea fed back by the T-box, a ratio of the diesel price to the urea price is calculated, an optimal primary NOx level is obtained by searching for an ' optimal primary NOx level MAP ' from the ratio and the diesel price, the primary NOx level is converted into an ' primary adjustment MAP index ', and switching of MAPs of different primary NOx levels is realized by the index, including ' primary injection advance angle adjustment MAP ' rail pressure set value adjustment MAP ' and ' EGR rate adjustment MAP '.
In summary, according to the control method for the vehicle diesel engine provided by the embodiment of the application, when the ECU is powered on, the price of diesel and the price of urea are obtained, and the original rank of the engine is adjusted in real time according to the price of diesel and the price of urea, so that the proportion of diesel and urea consumed by the engine changes along with the change of the price of diesel and the price of urea. For example, when the price of diesel oil rises and the price of urea falls, the diesel oil in the engine is combusted more sufficiently, so that the consumption of the diesel oil by the engine is reduced, the consumption of the urea by the engine is increased, the overall economy of the engine is improved, and the total cost consumed when the diesel engine works is lower.
According to the vehicle diesel engine control device provided by the embodiment, the embodiment of the application also provides the vehicle diesel engine control device.
Referring to fig. 5, the drawing is a schematic diagram of a control device of a vehicle diesel engine according to an embodiment of the present application.
As shown in fig. 5, the vehicular diesel engine control apparatus in the embodiment of the present application includes:
the price acquisition module 100 is used for responding to triggering operation of a vehicle and acquiring diesel price and urea price.
And the target original row obtaining module 200 is configured to obtain a target original row of the engine according to the diesel price and the urea price and through a mapping relation between the original row of the engine and an effective diesel consumption rate and a urea consumption rate, where the effective diesel consumption rate is a diesel consumption amount of the engine outputting fixed power in unit time, and the urea consumption rate is a urea consumption amount of the engine outputting fixed power in unit time.
And the control mode switching module 300 is used for adjusting the control mode of the engine to the control mode corresponding to the target original rank.
As a possible implementation manner, the price obtaining module is specifically configured to: when an Electronic Control Unit (ECU) of a vehicle is started, the price of diesel oil and the price of urea are obtained.
Therefore, the vehicle diesel engine control device provided by the embodiment of the application obtains the price of diesel and the price of urea in real time, and adjusts the original rank of the engine according to the price of the diesel and the price of the urea in real time, so that the proportion of the diesel and the urea consumed by the engine changes along with the change of the price of the diesel and the price of the urea, the overall economy of the vehicle diesel engine is improved, and the total cost consumed by the diesel engine during operation is lower.
As can be seen from the above description of the embodiments, those skilled in the art can clearly understand that all or part of the steps in the above embodiment methods can be implemented by software plus a necessary general hardware platform. Based on such understanding, the technical solution of the present application may be essentially or partially implemented in the form of a software product, which may be stored in a storage medium, such as a ROM/RAM, a magnetic disk, an optical disk, etc., and includes several instructions for enabling a computer device (which may be a personal computer, a server, or a network communication device such as a media gateway, etc.) to execute the method according to the embodiments or some parts of the embodiments of the present application.
It should be noted that, in the present specification, the embodiments are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments may be referred to each other. The method disclosed by the embodiment corresponds to the system disclosed by the embodiment, so that the description is simple, and the relevant points can be referred to the system part for description.
It should also be noted that, in this document, 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 an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The foregoing description of the disclosed embodiments will enable those skilled in the art to make or use the invention in various modifications to these embodiments, which will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the application. Thus, the present application 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. A vehicular diesel engine control method characterized by comprising:
responding to the triggering operation of the vehicle, and acquiring the price of diesel oil and the price of urea;
according to the diesel price and the urea price, obtaining a target original row of the engine through a mapping relation between the original row of the engine and an effective diesel consumption rate and a urea consumption rate, wherein the effective diesel consumption rate is the diesel consumption of the engine outputting fixed power in unit time, and the urea consumption rate is the urea consumption of the engine outputting fixed power in unit time;
and adjusting the control mode of the engine to the control mode corresponding to the target original row.
2. The method of claim 1, wherein the obtaining a diesel price and a urea price in response to a triggering operation of a vehicle comprises:
when an Electronic Control Unit (ECU) of a vehicle is started, the price of diesel oil and the price of urea are obtained.
3. The method of claim 1, wherein the obtaining a target bank of an engine comprises:
a target emission is obtained that minimizes the sum of the diesel cost and the urea cost of the engine.
4. The method of claim 1, wherein the adjusting the control mode of the engine to the control mode corresponding to the target bank comprises:
and adjusting the main injection advance angle, the rail pressure set value and the exhaust gas recirculation EGR rate of the engine to the main injection advance angle, the rail pressure set value and the exhaust gas recirculation EGR rate corresponding to the target original line.
5. The method of claim 1, wherein the obtaining a diesel price and a urea price in response to a triggering operation of a vehicle comprises:
responding to the triggering operation of the vehicle, an Electronic Control Unit (ECU) of the vehicle sends a price information request to a vehicle-mounted networking terminal T-box;
and the electronic control unit receives the price information sent by the vehicle-mounted networking terminal and acquires the price of diesel oil and the price of urea.
6. The method of claim 5, further comprising:
the electronic control unit judges whether the diesel price is in a preset diesel price interval or not and judges whether the urea price is in a preset urea price interval or not;
and when the diesel price is not in the preset diesel price interval and/or the urea price is not in the preset urea price interval, the electronic control unit sends a price information request to the vehicle-mounted networking terminal again.
7. The method of claim 6, further comprising:
when the number of times of price information requests continuously transmitted to the vehicle network system by the electronic control unit exceeds a preset threshold, the electronic control unit does not transmit price information requests to the vehicle network system any more.
8. The method of claim 1, further comprising, prior to adjusting the control mode of the engine to the control mode corresponding to the target bank:
and confirming the state of the engine to be capable of adjusting the original row.
9. A vehicular diesel engine control apparatus characterized by comprising:
the price acquisition module is used for responding to the triggering operation of the vehicle and acquiring the price of diesel oil and the price of urea;
the target original row obtaining module is used for obtaining a target original row of the engine through a mapping relation between the original row of the engine and an effective diesel consumption rate and a urea consumption rate according to the diesel price and the urea price, wherein the effective diesel consumption rate is the diesel consumption amount of the engine outputting fixed power in unit time, and the urea consumption rate is the urea consumption amount of the engine outputting fixed power in unit time;
and the control mode switching module is used for adjusting the control mode of the engine to the control mode corresponding to the target original row.
10. The apparatus of claim 9, wherein the price acquisition module is specifically configured to:
when an Electronic Control Unit (ECU) of a vehicle is started, the price of diesel oil and the price of urea are obtained.
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