CN109306914B - Large-cylinder-diameter engine control method and device - Google Patents
Large-cylinder-diameter engine control method and device Download PDFInfo
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- CN109306914B CN109306914B CN201811123767.8A CN201811123767A CN109306914B CN 109306914 B CN109306914 B CN 109306914B CN 201811123767 A CN201811123767 A CN 201811123767A CN 109306914 B CN109306914 B CN 109306914B
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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
- F02D41/30—Controlling fuel injection
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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
- F02D41/008—Controlling each cylinder individually
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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
- F02D41/14—Introducing closed-loop corrections
- F02D41/1438—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor
- F02D41/1444—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor characterised by the characteristics of the combustion gases
- F02D41/1446—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor characterised by the characteristics of the combustion gases the characteristics being exhaust temperatures
Abstract
The invention provides a method and a device for controlling a large-cylinder-diameter engine, wherein the method comprises the following steps: acquiring exhaust temperatures of cylinders on two sides of an engine; calculating temperature deviation between the exhaust temperatures, and judging whether the temperature deviation is within a preset deviation allowable range; if not, determining the maximum fuel injection quantity limiting percentage of a target cylinder with the highest exhaust temperature in the cylinders on the two sides of the engine, and sending the maximum fuel injection quantity limiting percentage to a controller corresponding to the target cylinder, so that the controller receiving the maximum fuel injection quantity limiting percentage controls the target cylinder to inject fuel according to the maximum fuel injection quantity limiting percentage. According to the invention, the temperature deviation of the exhaust temperature is detected to limit the highest exhaust temperature in the cylinders at two sides of the engine, namely the fuel injection quantity of the target cylinder with the highest power, so that the problem of inconsistent output power of the cylinders at two sides of the engine is relieved and even avoided, the minimum torsional vibration of the crankshaft of the engine is ensured, and the mechanical life of the engine is prolonged.
Description
Technical Field
The invention relates to the technical field of engine control, in particular to a method and a device for controlling a large-cylinder-diameter engine.
Background
The large-bore engine adopts double controllers, the cylinders are arranged on two sides in a V-shaped structure, and the oil injection of the cylinder on each side is controlled by one controller in the double controllers.
In the long-time use process, the problem of inconsistent output power of the cylinders at the two sides of the engine can occur due to the fact that the cylinders at the two sides of the engine body are abraded and the valve clearance or the oil injector is abraded inconsistently. When the engine runs under the working condition for a long time under full load, the problems of different detonation pressures and air leakage at two sides of the engine can occur, and finally the engine is applied to the crankshaft to generate different torsional shocks, so that the serious consequences of crankshaft damage and even fracture can be caused in the past, and the mechanical life of the engine is seriously damaged.
Disclosure of Invention
In view of the above, in order to solve the above problems, the present invention provides a method and a device for controlling a large-bore engine, and the technical scheme is as follows:
a method of controlling a large bore engine, the method comprising:
acquiring exhaust temperatures of cylinders on two sides of an engine;
calculating the temperature deviation between the exhaust temperatures, and judging whether the temperature deviation is within a preset deviation allowable range;
if not, determining the maximum fuel injection limiting percentage of a target cylinder with the highest exhaust temperature in cylinders on two sides of the engine, and sending the maximum fuel injection limiting percentage to a controller corresponding to the target cylinder, so that the controller receiving the maximum fuel injection limiting percentage controls the target cylinder to inject fuel according to the maximum fuel injection limiting percentage.
Preferably, the determining the maximum fuel injection quantity limit percentage of the target cylinder with the highest exhaust gas temperature in the cylinders on the two sides of the engine includes:
acquiring the oil injection quantity and the air inlet pressure of a target cylinder with the highest exhaust temperature in cylinders on two sides of the engine;
and acquiring a preset theoretical fuel injection quantity corresponding to the intake pressure, and taking the ratio of the theoretical fuel injection quantity to the fuel injection quantity as a maximum fuel injection quantity limiting percentage.
Preferably, before calculating the temperature deviation between the exhaust temperatures, the method further comprises:
the step of performing a plausibility check on the exhaust temperatures and performing the step of calculating a temperature deviation between the exhaust temperatures in a case where the exhaust temperatures are plausible.
Preferably, the method further comprises:
and under the condition that the exhaust temperature is not credible, sending a preset maximum torque limit percentage to controllers corresponding to cylinders on two sides of the engine respectively, so that the controller receiving the maximum torque limit percentage controls the corresponding cylinders to inject oil according to the maximum torque limit percentage.
Preferably, the method further comprises:
if yes, prompt information used for representing normal exhaust temperature of the engine is generated.
A large bore engine control apparatus, the apparatus comprising:
the acquisition module is used for acquiring exhaust temperatures of cylinders on two sides of the engine;
the judging module is used for calculating the temperature deviation between the exhaust temperatures and judging whether the temperature deviation is within a preset deviation allowable range; if not, triggering a determining module;
the determining module is used for determining the maximum fuel injection quantity limiting percentage of a target cylinder with the highest exhaust temperature in cylinders on two sides of the engine, and sending the maximum fuel injection quantity limiting percentage to a controller corresponding to the target cylinder, so that the controller receiving the maximum fuel injection quantity limiting percentage controls the target cylinder to inject fuel according to the maximum fuel injection quantity limiting percentage.
Preferably, the determining module, configured to determine the maximum fuel injection quantity limit percentage of the target cylinder with the highest exhaust gas temperature in the cylinders on the two sides of the engine, is specifically configured to:
acquiring the oil injection quantity and the air inlet pressure of a target cylinder with the highest exhaust temperature in cylinders on two sides of the engine; and acquiring a preset theoretical fuel injection quantity corresponding to the intake pressure, and taking the ratio of the theoretical fuel injection quantity to the fuel injection quantity as a maximum fuel injection quantity limiting percentage.
Preferably, the apparatus further comprises:
and the detection module is used for carrying out credibility detection on the exhaust temperature and triggering the judgment module under the condition that the exhaust temperature is credible.
Preferably, the apparatus further comprises:
and the sending module is used for sending a preset maximum torque limit percentage to controllers corresponding to cylinders on two sides of the engine respectively under the condition that the exhaust temperature is not credible, so that the controller receiving the maximum torque limit percentage controls the corresponding cylinders to inject oil according to the maximum torque limit percentage.
Preferably, the apparatus further comprises:
and the generation module is used for generating prompt information for representing normal exhaust temperature of the engine if the engine is normal.
Compared with the prior art, the invention has the following beneficial effects:
the invention provides a large-cylinder-diameter engine control method and device, which limit the highest exhaust temperature in the cylinders at two sides of the engine, namely the fuel injection quantity of the target cylinder with the highest power by detecting the temperature deviation of the exhaust temperature, relieve or even avoid the problem of inconsistent output power of the cylinders at two sides of the engine, ensure the minimum torsional vibration of a crankshaft of the engine and further prolong the mechanical life of the engine.
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 embodiments or the prior art descriptions 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 flow chart of a method of controlling a large bore engine according to an embodiment of the present invention;
FIG. 2 is a flow chart of another method of controlling a large bore engine according to an embodiment of the present disclosure;
fig. 3 is a schematic structural diagram of a large-bore engine control device according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The embodiment of the invention provides a large-cylinder-diameter engine control method, and a flow chart of the method is shown in figure 1, and the method comprises the following steps:
and S10, acquiring the exhaust temperature of the cylinders on the two sides of the engine.
The method provided by the embodiment can be applied to any one of double controllers adopted by a large-cylinder-diameter engine and can also be applied to a vehicle control unit. The main controller applied to the dual controller is taken as an example for explanation:
the master controller obtains the exhaust temperature of the corresponding cylinder and receives the exhaust temperature of the corresponding cylinder fed back from the slave controller.
S20, calculating the temperature deviation between the exhaust temperatures, and judging whether the temperature deviation is within a preset deviation allowable range; if not, step S30 is executed.
In this embodiment, if the temperature deviation is within the preset deviation allowable range, it indicates that the engine exhaust temperature is normal, and prompt information for indicating that the engine exhaust temperature is normal is generated.
And S30, determining the maximum fuel injection limiting percentage of a target cylinder with the highest exhaust temperature in the cylinders on the two sides of the engine, and sending the maximum fuel injection limiting percentage to a controller corresponding to the target cylinder, so that the controller receiving the maximum fuel injection limiting percentage controls the target cylinder to inject fuel according to the maximum fuel injection limiting percentage.
In the process of executing step S30, the maximum fuel injection quantity limiting percentage of the target cylinder with the highest exhaust temperature may be searched according to the corresponding relationship between the temperature deviation calibrated in advance and the maximum fuel injection quantity limiting percentage; it can also be determined by the intake pressure of the cylinder, in particular:
firstly, acquiring the fuel injection quantity and the air intake pressure of a target cylinder with the highest exhaust temperature in cylinders on two sides of an engine; and acquiring a preset theoretical oil injection quantity corresponding to the intake pressure, and taking the ratio of the theoretical oil injection quantity to the oil injection quantity as the maximum oil injection quantity limiting percentage.
It should be noted that the fuel injection amount corresponding to the theoretical upper intake pressure may be calibrated in advance.
In addition, when the controller receives the maximum fuel injection amount limit percentage, the controller may first calculate a target fuel injection amount by using the maximum fuel injection amount limit percentage and the current fuel injection amount, where the specific target fuel injection amount is equal to a product of the maximum fuel injection amount limit percentage and the current fuel injection amount, and further control the target cylinder to inject fuel according to the target fuel injection amount.
In other embodiments, to ensure the accuracy of the control, on the basis of the control method of the large-bore engine shown in fig. 1, the method further comprises the following steps:
S40, the reliability of the exhaust temperature is detected, and if the exhaust temperature is reliable, step S20 is executed.
In the process of executing step S40, whether the exhaust temperature signal voltage or the exhaust temperature value is within the preset range may be determined by detecting the exhaust temperature signal voltage or the exhaust temperature value, and if so, it indicates that the exhaust temperature is reliable, otherwise, it is not reliable.
Further, if the exhaust temperature is not credible, the preset maximum torque limit percentage can be sent to the controllers corresponding to the cylinders on the two sides of the engine respectively, so that the controller receiving the maximum torque limit percentage controls the corresponding cylinder to inject oil according to the maximum torque limit percentage. Specifically, the method comprises the following steps:
when the controller receives the maximum torque limit percentage, firstly, the maximum torque limit percentage and the current torque are used for calculating a target torque, and then the fuel injection quantity corresponding to the target torque is used for controlling the cylinder to inject fuel.
According to the control method of the large-bore engine provided by the embodiment of the invention, the temperature deviation of the exhaust temperature is detected to limit the fuel injection quantity of the target cylinder with the highest exhaust temperature, namely the highest power, in the cylinders on the two sides of the engine, so that the problem of inconsistent output power of the cylinders on the two sides of the engine is relieved and even avoided, the crankshaft torsional vibration of the engine is ensured to be minimum, and the mechanical life of the engine is prolonged.
Based on the control method for the large-bore engine provided in the foregoing embodiment, an embodiment of the present invention correspondingly provides an apparatus for executing the control method for the large-bore engine, where a schematic structural diagram of the apparatus is shown in fig. 3, and the apparatus includes:
the acquiring module 10 is used for acquiring exhaust temperatures of cylinders on two sides of an engine;
the judging module 20 is configured to calculate a temperature deviation between the exhaust temperatures, and judge whether the temperature deviation is within a preset deviation allowable range; if not, the determining module 30 is triggered;
the determining module 30 is configured to determine a maximum fuel injection limiting percentage of a target cylinder with the highest exhaust temperature among cylinders on two sides of the engine, and send the maximum fuel injection limiting percentage to a controller corresponding to the target cylinder, so that the controller receiving the maximum fuel injection limiting percentage controls the target cylinder to inject fuel according to the maximum fuel injection limiting percentage.
Optionally, the determining module 30 for determining the maximum fuel injection limit percentage of the target cylinder with the highest exhaust temperature among the cylinders on the two sides of the engine is specifically configured to:
acquiring the oil injection quantity and the air inlet pressure of a target cylinder with the highest exhaust temperature in cylinders on two sides of the engine; and acquiring a preset theoretical oil injection quantity corresponding to the intake pressure, and taking the ratio of the theoretical oil injection quantity to the oil injection quantity as the maximum oil injection quantity limiting percentage.
Optionally, on the basis of the control device for the large-bore engine shown in fig. 3, the control device further includes the following modules:
the detecting module is configured to perform credibility detection on the exhaust temperature, and trigger the determining module 20 when the exhaust temperature is credible.
Optionally, on the basis of the control device for the large-bore engine shown in fig. 3, the control device further includes the following modules:
and the sending module is used for sending the preset maximum torque limit percentage to the controllers corresponding to the cylinders on the two sides of the engine respectively under the condition that the exhaust temperature is not credible, so that the controller receiving the maximum torque limit percentage controls the corresponding cylinder to inject oil according to the maximum torque limit percentage.
Optionally, on the basis of the control device for the large-bore engine shown in fig. 3, the control device further includes the following modules:
and the generation module is used for generating prompt information for representing normal exhaust temperature of the engine if the engine is normal.
According to the large-cylinder-diameter engine control device provided by the embodiment of the invention, the temperature deviation of the exhaust temperature is detected to limit the fuel injection quantity of the target cylinder with the highest exhaust temperature, namely the highest power, in the cylinders on the two sides of the engine, so that the problem of inconsistent output power of the cylinders on the two sides of the engine is relieved and even avoided, the minimum torsional vibration of the crankshaft of the engine is ensured, and the mechanical life of the engine is prolonged.
The method and the device for controlling the large-bore engine provided by the invention are described in detail, the principle and the implementation mode of the invention are explained by applying specific examples, and the description of the examples is only used for helping to understand the method and the core idea of the invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present invention.
It should be noted that, in the present specification, the embodiments are all 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 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 or 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 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 (4)
1. A large bore engine control method, characterized by comprising:
acquiring exhaust temperatures of cylinders on two sides of an engine;
detecting the reliability of the exhaust temperature;
if the exhaust temperature is credible, calculating the temperature deviation between the exhaust temperatures, and judging whether the temperature deviation is within a preset deviation allowable range;
if not, determining the maximum fuel injection limiting percentage of a target cylinder with the highest exhaust temperature in cylinders on two sides of the engine, and sending the maximum fuel injection limiting percentage to a controller corresponding to the target cylinder, so that the controller receiving the maximum fuel injection limiting percentage controls the target cylinder to inject fuel according to the maximum fuel injection limiting percentage;
If the exhaust temperature is not credible, sending a preset maximum torque limit percentage to controllers corresponding to cylinders on two sides of the engine respectively so that the controller receiving the maximum torque limit percentage controls the corresponding cylinders to inject oil according to the maximum torque limit percentage;
the determining of the maximum fuel injection quantity limiting percentage of the target cylinder with the highest exhaust temperature in the cylinders on the two sides of the engine comprises the following steps:
acquiring the fuel injection quantity and the intake pressure of a target cylinder with the highest exhaust temperature in cylinders on two sides of the engine;
and acquiring a preset theoretical oil injection quantity corresponding to the intake pressure, and taking the ratio of the theoretical oil injection quantity to the oil injection quantity as a maximum oil injection quantity limiting percentage.
2. The method of claim 1, further comprising:
if yes, prompt information used for representing normal exhaust temperature of the engine is generated.
3. A large-bore engine control device, characterized by comprising:
the acquisition module is used for acquiring exhaust temperatures of cylinders on two sides of the engine;
the judging module is used for calculating the temperature deviation between the exhaust temperatures and judging whether the temperature deviation is within a preset deviation allowable range; if not, triggering a determining module;
The determining module is configured to determine a maximum fuel injection limiting percentage of a target cylinder with the highest exhaust temperature among cylinders on two sides of the engine, and send the maximum fuel injection limiting percentage to a controller corresponding to the target cylinder, so that the controller receiving the maximum fuel injection limiting percentage controls the target cylinder to inject fuel according to the maximum fuel injection limiting percentage;
the detection module is used for carrying out credibility detection on the exhaust temperature and triggering the judgment module under the condition that the exhaust temperature is credible;
the sending module is used for sending a preset maximum torque limit percentage to controllers corresponding to cylinders on two sides of the engine respectively under the condition that the exhaust temperature is not credible, so that the controllers receiving the maximum torque limit percentage control the corresponding cylinders to inject oil according to the maximum torque limit percentage;
wherein the determining module is specifically configured to: acquiring the fuel injection quantity and the intake pressure of a target cylinder with the highest exhaust temperature in cylinders on two sides of the engine; and acquiring a preset theoretical oil injection quantity corresponding to the intake pressure, and taking the ratio of the theoretical oil injection quantity to the oil injection quantity as a maximum oil injection quantity limiting percentage.
4. The apparatus of claim 3, further comprising:
and the generation module is used for generating prompt information for representing normal exhaust temperature of the engine if the engine is normal.
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| CN201811123767.8A CN109306914B (en) | 2018-09-26 | 2018-09-26 | Large-cylinder-diameter engine control method and device |
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| CN201811123767.8A CN109306914B (en) | 2018-09-26 | 2018-09-26 | Large-cylinder-diameter engine control method and device |
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| CN109306914B true CN109306914B (en) | 2022-06-28 |
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| CN110284970B (en) * | 2019-06-29 | 2020-08-21 | 潍柴动力股份有限公司 | Anomaly detection method and device |
| CN112943467A (en) * | 2021-02-05 | 2021-06-11 | 潍柴动力股份有限公司 | Injection correction method and system for engine exhaust temperature consistency and storage medium |
| CN114233500B (en) * | 2021-12-22 | 2024-02-20 | 潍柴动力股份有限公司 | Control method for working uniformity of each cylinder of large-cylinder-diameter diesel engine and diesel engine |
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| US10408158B2 (en) * | 2016-09-30 | 2019-09-10 | Ge Global Sourcing Llc | Differential cylinder balancing for internal combustion engine |
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| CN1296615C (en) * | 2001-08-29 | 2007-01-24 | 新泻原动机株式会社 | Engine, engine exhaust temperature controlling device and controlling method |
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