CN110552779A - Engine air inlet structure, engine air inlet control method and engine air inlet control device - Google Patents
Engine air inlet structure, engine air inlet control method and engine air inlet control device Download PDFInfo
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- CN110552779A CN110552779A CN201910945583.8A CN201910945583A CN110552779A CN 110552779 A CN110552779 A CN 110552779A CN 201910945583 A CN201910945583 A CN 201910945583A CN 110552779 A CN110552779 A CN 110552779A
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- air
- engine
- condition
- air inlet
- gas
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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
- F02B33/00—Engines characterised by provision of pumps for charging or scavenging
- F02B33/44—Passages conducting the charge from the pump to the engine inlet, e.g. reservoirs
-
- 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
- F02B33/00—Engines characterised by provision of pumps for charging or scavenging
- F02B33/44—Passages conducting the charge from the pump to the engine inlet, e.g. reservoirs
- F02B33/446—Passages conducting the charge from the pump to the engine inlet, e.g. reservoirs having valves for admission of atmospheric air to engine, e.g. at starting
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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
- F02D33/00—Controlling delivery of fuel or combustion-air, not otherwise provided for
- F02D33/02—Controlling delivery of fuel or combustion-air, not otherwise provided for of combustion-air
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Output Control And Ontrol Of Special Type Engine (AREA)
Abstract
The application discloses engine air inlet structure, engine air inlet control method and device, and the method comprises the following steps: determining whether the current condition meets a first condition, wherein the first condition comprises that the air quantity of the engine braking force which can be effectively transmitted to wheels and an air bottle reaches a first preset value; under the condition that all condition items in the first condition are met, judging whether an emergency braking signal is received or not; and if so, controlling an air inlet butterfly valve to be opened so as to release the gas in the gas cylinder and introduce the gas into the engine cylinder. The engine air inlet control method can store compressed gas in the air cylinder after the whole vehicle is started, and can control the release of the gas in the air cylinder to be introduced into an air inlet pipe in front of an engine cylinder when the vehicle is in an emergency braking state, so that the air quantity in the engine cylinder is sufficient under the emergency braking condition, and the braking power is ensured.
Description
Technical Field
the invention relates to a brake control technology, in particular to an engine air inlet structure, an engine air inlet control method and an engine air inlet control device.
background
At the moment of brake activation in an engine cylinder, after intercooling, the air inlet pressure is low, and due to factors such as inertia of an air inlet system, the air inlet amount of the cylinder is slowly increased, so that the air inlet amount of the engine cylinder is insufficient. Therefore, at the initial stage of the in-cylinder braking, the amount of the piston up-stroke compressed air is insufficient, and the in-cylinder braking power is insufficient. This situation may lead to safety accidents in some emergency situations.
disclosure of Invention
In view of the above, the invention provides an engine air intake structure, an engine air intake control method and an engine air intake control device, so as to overcome the problem of insufficient braking power during in-cylinder braking in the prior art.
In order to achieve the purpose, the invention provides the following technical scheme:
an engine air inlet structure comprises an air filter, a supercharger, an intercooler and an engine cylinder which are sequentially connected, and further comprises an air compressor, an air cylinder, an air inlet butterfly valve and a first controller for controlling the air inlet butterfly valve, wherein the air compressor, the air cylinder, the air inlet butterfly valve and the first controller are sequentially connected;
The air filter is arranged on the air inlet side of the air compressor;
The exhaust side of the air inlet butterfly valve is an air inlet pipe between the intercooler and the engine cylinder;
the first controller is used for controlling the air inlet butterfly valve to be opened when the whole vehicle system meets a preset condition so as to release the gas in the gas cylinder and introduce the gas into an engine cylinder.
Optionally, a dryer is further arranged between the air compressor and the air bottle.
optionally, an air check valve is further disposed between the air cylinder and the air inlet butterfly valve, and the air check valve is used for controlling the air route to flow to the air inlet butterfly valve from the air cylinder.
an engine intake control method applied to any one of the above engine intake structures, comprising:
Determining whether the current condition meets a first condition, wherein the first condition comprises that the air quantity of the engine braking force which can be effectively transmitted to wheels and an air bottle reaches a first preset value;
Under the condition that all condition items in the first condition are met, judging whether an emergency braking signal is received or not;
And if so, controlling an air inlet butterfly valve to be opened so as to release the gas in the gas cylinder and introduce the gas into the engine cylinder.
Optionally, the first condition further includes: the vehicle speed is greater than the second preset value.
Alternatively, determining that engine braking force can be efficiently transferred to the wheels, comprises:
It is determined that the clutch is in an off state and that the gearbox gear is not neutral.
Optionally, determining that the gas amount in the gas cylinder reaches a first preset value includes:
and determining that the running time after the whole vehicle is started is longer than a first time threshold, or determining that the amount of gas flowing into the gas cylinder reaches a first preset value through a gas metering device.
Optionally, the receiving the emergency braking signal includes:
and receiving a braking signal and an exhaust braking signal within a preset time period.
Optionally, the method further includes:
and filtering the exhaust braking signal, and taking the filtered exhaust braking signal as a subsequent related judgment subject.
An engine intake control device applied to any one of the above engine intake structures, characterized by comprising:
The condition judgment module is used for determining whether the current condition meets a first condition, wherein the first condition comprises that the air quantity of the engine braking force which can be effectively transmitted to wheels and an air bottle reaches a first preset value;
The signal receiving module is used for judging whether an emergency braking signal is received or not under the condition that all condition items in the first condition are met;
And the butterfly valve control module is used for controlling the air inlet butterfly valve to be opened when the signal receiving module judges that the emergency braking signal is received, so that the gas in the gas cylinder is released and introduced into the engine cylinder.
Compared with the prior art, the embodiment of the invention discloses an engine air inlet structure, an engine air inlet control method and an engine air inlet control device, wherein the method comprises the following steps: determining whether the current condition meets a first condition, wherein the first condition comprises that the air quantity of the engine braking force which can be effectively transmitted to wheels and an air bottle reaches a first preset value; under the condition that all condition items in the first condition are met, judging whether an emergency braking signal is received or not; and if so, controlling an air inlet butterfly valve to be opened so as to release the gas in the gas cylinder and introduce the gas into the engine cylinder. The engine air inlet control method can store compressed gas in the air cylinder after the whole vehicle is started, and can control the release of the gas in the air cylinder to be introduced into an air inlet pipe in front of an engine cylinder when the vehicle is in an emergency braking state, so that the air quantity in the engine cylinder is sufficient under the emergency braking condition, and the braking power is ensured.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
FIG. 1 is a schematic diagram of an engine intake configuration according to an embodiment of the present disclosure;
FIG. 2 is a schematic illustration of another engine air intake configuration disclosed in an embodiment of the present invention;
FIG. 3 is a flowchart of a method for controlling engine air intake according to an embodiment of the present disclosure;
FIG. 4 is a flow chart illustrating another method for controlling engine air intake in accordance with the disclosed embodiment;
FIG. 5 is a functional diagram of the control logic of the intake butterfly valve disclosed in the embodiment of the present invention;
Fig. 6 is a schematic structural diagram of an engine intake control device disclosed in the embodiment of the invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Fig. 1 is a schematic diagram of an engine intake structure according to an embodiment of the present invention, and referring to fig. 1, the engine intake structure may include:
The air cleaner 1, booster 2, intercooler 3 and the engine cylinder 4 that connect gradually still include air compressor machine 5, gas cylinder 6, the butterfly valve 7 that admits air and be used for controlling that connect gradually the first controller 8 of butterfly valve 7 admits air.
The air filter 1 is arranged on the air inlet side of the air compressor 5, and the air inlet butterfly valve 7 is arranged on the air outlet side of the intercooler 3 and the air inlet pipe between the engine cylinders 4.
And the first controller 8 is used for controlling the air inlet butterfly valve 7 to be opened when the whole vehicle system meets a preset condition so as to release the gas in the gas cylinder and introduce the gas into an engine cylinder.
as shown in fig. 1, the air cleaner 1 can introduce air into the supercharger 2 and the air compressor 5 at the same time, and the air compressor 5 can store the air into the air cylinder 6. Thus, when air needs to be introduced into the engine cylinder 4, not only can the intercooler 3 flow air into the engine cylinder 4, but also the air in the air bottle 6 can be introduced into the engine cylinder 4, and two paths of air flow enter an air inlet pipe of the engine cylinder, so that the quantity of compressed air in the ascending stroke of the piston can be ensured to be enough.
Fig. 2 is a schematic diagram of another engine air intake structure disclosed in an embodiment of the present invention, and referring to fig. 2, in another implementation, the engine air intake structure may further include a dryer 9 disposed between the air compressor 5 and the air cylinder 6, in addition to the air cleaner 1, the supercharger 2, the intercooler 3, and the engine cylinder 4, which are connected in sequence, and the air compressor 5, the air cylinder 6, the air intake butterfly valve 7, and the first controller 8, which are connected in sequence. The dryer 9 is used for drying the air output by the air compressor 5.
optionally, an air check valve 10 (an air check valve structure is also shown in fig. 2) arranged between the air bottle 6 and the air inlet butterfly valve 7 can be further included in the engine air inlet structure. The air one-way valve 10 ensures that gas can only flow from the gas cylinder to the direction of the inlet butterfly valve 7.
The structural design of the embodiment can lead high-pressure gas in the gas cylinder into the intercooling rear air inlet main pipe at the moment of braking and activating in the engine cylinder, so that the cylinder can obtain sufficient air at the initial braking stage of the engine, and the braking power in the engine cylinder is improved.
Fig. 3 is a flowchart of an engine intake control method according to an embodiment of the present invention, where the method is applied to any one of the engine intake structures described in the foregoing embodiments, and with reference to fig. 3, the engine intake control method may include:
Step 301: it is determined whether a current engine condition satisfies a first condition that includes an amount of engine braking force that is effectively transferred to wheels and a gas cylinder reaching a first preset value.
And the current engine condition meets a first condition, namely condition items in the first condition are met.
Of course, the content included in the first condition may also include other content, for example, the first condition may include: the vehicle speed is greater than the second preset value. The vehicle speed condition, which is one of the function activation conditions, may be used to detect that the vehicle is in normal operation.
Wherein determining that the engine braking force can be efficiently transmitted to the wheels may include: it is determined that the clutch is in an off state and that the gearbox gear is not neutral.
Wherein, determining that the gas amount in the gas cylinder reaches a first preset value may include: and determining that the running time after the whole vehicle is started is longer than a first time threshold, or determining that the amount of gas flowing into the gas cylinder reaches a first preset value through a gas metering device.
Step 302: and judging whether an emergency braking signal is received or not under the condition that all condition items in the first condition are met, if so, entering step 303.
The first condition is used for ensuring that enough air can be smoothly introduced into the engine cylinder through the air inlet butterfly valve when the air inlet butterfly valve is controlled to be opened. In this embodiment, only when the first condition is satisfied, whether the emergency braking signal is received is determined, and when any one of the first conditions is not satisfied, whether the intake butterfly valve is opened is not determined, so that a situation that sufficient air cannot be ensured to enter the engine cylinder even if the intake butterfly valve is opened is prevented, and resource waste is avoided. And judging whether the air inlet butterfly valve is opened is to judge whether the emergency braking signal is received.
Step 303: and controlling an air inlet butterfly valve to be opened so as to release and introduce the gas in the gas cylinder into the engine cylinder.
after the air inlet butterfly valve is opened, the air in the air bottle can enter an air inlet pipe in front of the engine cylinder, and the air is introduced into the engine cylinder.
if the emergency braking signal is not received, no other operation is performed.
in the embodiment, compressed gas can be stored in the gas cylinder in the starting state of the whole vehicle, and the high-pressure gas in the gas cylinder can be controlled to be rapidly introduced into the intercooling rear gas inlet pipeline by opening the gas inlet butterfly valve at the moment of detecting the braking requirement in the cylinder of the engine cylinder, so that the braking power is improved.
Fig. 4 is a flowchart illustrating another engine intake control method according to an embodiment of the present invention, where as shown in fig. 4, the engine intake control method may include:
step 401: it is determined whether the current situation satisfies a first condition including that an amount of air, at which engine braking force can be effectively transmitted to wheels and an air cylinder, reaches a first preset value.
step 402: and under the condition that the condition items in the first condition are all satisfied, judging whether a braking signal and an exhaust braking signal are received in a preset time period, and if so, entering step 403.
In order to distinguish whether emergency braking is performed, the function of controlling the air inlet butterfly valve can be normally opened only when the braking signal and the exhaust braking signal are simultaneously activated. Of course, in consideration of the fact that the brake signal and the exhaust brake signal cannot be received at the same time in practical terms, in this embodiment, it is determined that the two signals can be received successively within the preset time period, and then the intake butterfly valve can be triggered to be opened. The time of the preset time period may be small, for example, 0.1 second.
Step 403: and if so, controlling an air inlet butterfly valve to be opened so as to release the gas in the gas cylinder and introduce the gas into the engine cylinder.
in this embodiment, the engine air intake control method can store compressed gas in the air cylinder after the vehicle is started, and can control the release of the gas in the air cylinder to be introduced into the air inlet pipe in front of the engine cylinder when the vehicle is in an emergency braking state, so that the air quantity in the engine cylinder is sufficient under the emergency braking condition, and the braking power is ensured.
fig. 5 is a functional diagram of the control logic of the intake butterfly valve according to the embodiment of the present invention, and the related contents described in the above embodiment can be understood by referring to fig. 5.
the contents included in fig. 5 are as follows:
In order to ensure sufficient gas quantity of the gas cylinder, timing is started after the whole vehicle is started, and the gas cylinder can be ensured to be full of gas after the running time of the engine is longer than a time threshold;
The clutch is in a closed state, and the gear of the gearbox is not in a neutral position, so that the braking force of the engine can be effectively transmitted to the wheels;
The vehicle speed condition is used as one of the function activation conditions and is used for detecting that the vehicle is in normal operation;
in order to distinguish whether the emergency braking is carried out, the function can be normally started only if the main braking signal and the exhaust braking signal are activated simultaneously;
The filter switch selects whether the exhaust brake signal needs to be filtered. If the braking signal is filtered, the filtered exhaust braking signal can be used as a subsequent related judgment subject.
while, for purposes of simplicity of explanation, the foregoing method embodiments have been described as a series of acts or combination of acts, it will be appreciated by those skilled in the art that the present invention is not limited by the illustrated ordering of acts, as some steps may occur in other orders or concurrently with other steps in accordance with the invention. Further, those skilled in the art should also appreciate that the embodiments described in the specification are preferred embodiments and that the acts and modules referred to are not necessarily required by the invention.
The method is described in detail in the embodiments disclosed above, and the method of the present invention can be implemented by various types of apparatuses, so that the present invention also discloses an apparatus, and the following detailed description will be given of specific embodiments.
Fig. 6 is a schematic structural diagram of an engine intake control device disclosed in an embodiment of the invention, and the device shown in fig. 6 is applied to an engine intake structure described in any one of the embodiments. As shown in fig. 6, the engine intake control device 60 may include:
the condition judgment module 601 is configured to determine whether a current condition meets a first condition, where the first condition includes that an amount of engine braking force that can be effectively transmitted to a wheel and a gas cylinder reaches a first preset value.
of course, the content included in the first condition may also include other content, for example, the first condition may include: the vehicle speed is greater than the second preset value. The vehicle speed condition, which is one of the function activation conditions, may be used to detect that the vehicle is in normal operation.
Wherein determining that the engine braking force can be efficiently transmitted to the wheels may include: it is determined that the clutch is in an off state and that the gearbox gear is not neutral.
Wherein, determining that the gas amount in the gas cylinder reaches a first preset value may include: and determining that the running time after the whole vehicle is started is longer than a first time threshold, or determining that the amount of gas flowing into the gas cylinder reaches a first preset value through a gas metering device.
a signal receiving module 602, configured to determine whether an emergency braking signal is received when all condition items in the first condition are satisfied.
The first condition is used for ensuring that enough air can be smoothly introduced into the engine cylinder through the air inlet butterfly valve when the air inlet butterfly valve is controlled to be opened. In this embodiment, only when the first condition is satisfied, whether the emergency braking signal is received is determined, and when any one of the first conditions is not satisfied, whether the intake butterfly valve is opened is not determined, so that a situation that sufficient air cannot be ensured to enter the engine cylinder even if the intake butterfly valve is opened is prevented, and resource waste is avoided. And judging whether the air inlet butterfly valve is opened is to judge whether the emergency braking signal is received.
And the butterfly valve control module 603 is configured to control the intake butterfly valve to open when the signal receiving module determines that the emergency braking signal is received, so as to release the gas in the gas cylinder and introduce the gas into the engine cylinder.
After the air inlet butterfly valve is opened, the air in the air bottle can enter an air inlet pipe in front of the engine cylinder, and the air is introduced into the engine cylinder.
in one specific implementation, receiving the emergency braking signal may include: and receiving a braking signal and an exhaust braking signal within a preset time period.
if the emergency braking signal is not received, no other operation is performed.
in the embodiment, compressed gas can be stored in the gas cylinder in the starting state of the whole vehicle, and the high-pressure gas in the gas cylinder can be controlled to be rapidly introduced into the intercooling rear gas inlet pipeline by opening the gas inlet butterfly valve at the moment of detecting the braking requirement in the cylinder of the engine cylinder, so that the braking power is improved.
the embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. The device disclosed by the embodiment corresponds to the method disclosed by the embodiment, so that the description is simple, and the relevant points can be referred to the method part for description.
it is further noted that, herein, relational terms such as first and second, and the like may be 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. Also, 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 steps of a method or algorithm described in connection with the embodiments disclosed herein may be embodied directly in hardware, in a software module executed by a processor, or in a combination of the two. A software module may reside in Random Access Memory (RAM), memory, Read Only Memory (ROM), electrically programmable ROM, electrically erasable programmable ROM, registers, hard disk, a removable disk, a CD-ROM, or any other form of storage medium known in the art.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. An engine air inlet structure is characterized by comprising an air filter, a supercharger, an intercooler and an engine cylinder which are sequentially connected, and further comprising an air compressor, an air cylinder, an air inlet butterfly valve and a first controller for controlling the air inlet butterfly valve, wherein the air compressor, the air cylinder, the air inlet butterfly valve and the first controller are sequentially connected;
The air filter is arranged on the air inlet side of the air compressor;
the exhaust side of the air inlet butterfly valve is an air inlet pipe between the intercooler and the engine cylinder;
The first controller is used for controlling the air inlet butterfly valve to be opened when the whole vehicle system meets a preset condition so as to release the gas in the gas cylinder and introduce the gas into an engine cylinder.
2. The engine intake structure according to claim 1, wherein a dryer is further provided between the air compressor and the air cylinder.
3. The engine intake structure of claim 1, wherein an air check valve is further disposed between the gas cylinder and the intake butterfly valve, the air check valve being configured to control the flow of air routed from the gas cylinder to the intake butterfly valve.
4. an engine intake control method applied to an engine intake structure according to any one of claims 1 to 3, characterized by comprising:
Determining whether the current condition meets a first condition, wherein the first condition comprises that the air quantity of the engine braking force which can be effectively transmitted to wheels and an air bottle reaches a first preset value;
Under the condition that all condition items in the first condition are met, judging whether an emergency braking signal is received or not;
And if so, controlling an air inlet butterfly valve to be opened so as to release the gas in the gas cylinder and introduce the gas into the engine cylinder.
5. The engine intake control method according to claim 4, characterized in that the first condition further includes: the vehicle speed is greater than the second preset value.
6. The engine intake control method according to claim 4, wherein determining that the engine braking force can be efficiently transmitted to the wheels includes:
it is determined that the clutch is in an off state and that the gearbox gear is not neutral.
7. The engine intake control method according to claim 4, wherein determining that the amount of gas in the gas cylinder reaches a first preset value includes:
and determining that the running time after the whole vehicle is started is longer than a first time threshold, or determining that the amount of gas flowing into the gas cylinder reaches a first preset value through a gas metering device.
8. The engine air intake control method of claim 4, wherein the receiving an emergency brake signal comprises:
and receiving a braking signal and an exhaust braking signal within a preset time period.
9. The engine intake control method according to claim 8, characterized by further comprising:
and filtering the exhaust braking signal, and taking the filtered exhaust braking signal as a subsequent related judgment subject.
10. An engine intake control apparatus applied to an engine intake structure according to any one of claims 1 to 3, characterized by comprising:
The condition judgment module is used for determining whether the current condition meets a first condition, wherein the first condition comprises that the air quantity of the engine braking force which can be effectively transmitted to wheels and an air bottle reaches a first preset value;
The signal receiving module is used for judging whether an emergency braking signal is received or not under the condition that all condition items in the first condition are met;
And the butterfly valve control module is used for controlling the air inlet butterfly valve to be opened when the signal receiving module judges that the emergency braking signal is received, so that the gas in the gas cylinder is released and introduced into the engine cylinder.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910945583.8A CN110552779A (en) | 2019-09-30 | 2019-09-30 | Engine air inlet structure, engine air inlet control method and engine air inlet control device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910945583.8A CN110552779A (en) | 2019-09-30 | 2019-09-30 | Engine air inlet structure, engine air inlet control method and engine air inlet control device |
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| CN110552779A true CN110552779A (en) | 2019-12-10 |
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| CN201910945583.8A Pending CN110552779A (en) | 2019-09-30 | 2019-09-30 | Engine air inlet structure, engine air inlet control method and engine air inlet control device |
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| CN111520262A (en) * | 2020-03-31 | 2020-08-11 | 潍柴动力股份有限公司 | Air intake system, control method of air intake system and vehicle |
| CN115263568A (en) * | 2022-07-28 | 2022-11-01 | 潍柴动力股份有限公司 | In-cylinder brake control method and device for engine |
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| CN111520262B (en) * | 2020-03-31 | 2021-11-19 | 潍柴动力股份有限公司 | Control method of air intake system and vehicle |
| CN115263568A (en) * | 2022-07-28 | 2022-11-01 | 潍柴动力股份有限公司 | In-cylinder brake control method and device for engine |
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Application publication date: 20191210 |
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| RJ01 | Rejection of invention patent application after publication |