CN117418951A - Diesel engine rotating speed safety protection control device and method - Google Patents
Diesel engine rotating speed safety protection control device and method Download PDFInfo
- Publication number
- CN117418951A CN117418951A CN202311499318.4A CN202311499318A CN117418951A CN 117418951 A CN117418951 A CN 117418951A CN 202311499318 A CN202311499318 A CN 202311499318A CN 117418951 A CN117418951 A CN 117418951A
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- diesel engine
- rotating speed
- safety protection
- emergency
- override command
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- 238000000034 method Methods 0.000 title claims abstract description 22
- 238000001514 detection method Methods 0.000 claims abstract description 24
- 238000001816 cooling Methods 0.000 abstract description 7
- 238000012544 monitoring process Methods 0.000 description 9
- 239000000498 cooling water Substances 0.000 description 4
- 239000010687 lubricating oil Substances 0.000 description 4
- 238000010586 diagram Methods 0.000 description 2
- 239000000110 cooling liquid Substances 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
Classifications
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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
- F02D41/22—Safety or indicating devices for abnormal conditions
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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
- F02D41/0097—Electrical control of supply of combustible mixture or its constituents using means for generating speed signals
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D2200/00—Input parameters for engine control
- F02D2200/02—Input parameters for engine control the parameters being related to the engine
- F02D2200/10—Parameters related to the engine output, e.g. engine torque or engine speed
- F02D2200/101—Engine speed
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Combined Controls Of Internal Combustion Engines (AREA)
Abstract
The invention provides a device and a method for safely protecting and controlling the rotating speed of a diesel engine, wherein the device comprises: the rotating speed detection module comprises a plurality of rotating speed sensors for detecting the rotating speed of the diesel engine; a CPU control module; the system is used for acquiring the rotating speed data of the diesel engine and the emergency working condition override command, and controlling the diesel engine control system to work according to the rotating speed data of the diesel engine and the emergency working condition override command; a power input/output module; and the power supply module is used for supplying power to the rotating speed detection module and the CPU control module. The device and the method for safely protecting and controlling the rotating speed of the diesel engine can keep the normal running state and ensure the normal emergency cooling function of safety equipment under the condition of false alarm of the nuclear safety diesel engine together with the electronic control system of the nuclear safety diesel engine.
Description
Technical Field
The invention belongs to the field of diesel engine control, and particularly relates to a device and a method for safely protecting and controlling the rotating speed of a diesel engine.
Background
The diesel engine safety protection system has different strategies according to different practical applications. For example, the land power station diesel engine unit generally uses the temperature of cooling water, the lubricating oil pressure and the rotational speed of a diesel engine as judging conditions for the safety protection shutdown of the diesel engine, and the marine propulsion unit uses the high temperature of the cooling water as power limiting conditions, so that the shutdown treatment is not carried out. The safety protection judgment is basically from one group of measuring points to two groups of measuring points, and the safety protection strategy is a simple overrun shutdown strategy.
As the application field of the nuclear safety emergency unit, the diesel unit mainly bears the special operation condition of emergency power supply when the power supply of the reactor cooling system fails, so as to ensure that the reactor can be normally cooled to avoid nuclear safety accidents. Therefore, in the emergency mode, the diesel engine needs to reliably start and skip most possible safety protection measures, such as conventional alarms of high temperature of cooling liquid, low pressure of lubricating oil and the like of a general unit, but overspeed of the diesel engine is a serious fault, if the diesel engine is in an overspeed condition, the serious accident of the whole damage of the diesel engine is likely to be caused in a short time, so that the protection cannot be directly skipped, multistage redundancy judgment is needed for overspeed alarm of the diesel engine, and the situation that the diesel engine is not emergently stopped if false alarm caused by a diesel engine rotating speed sensor, external signal interference and the like is ensured. However, the existing independent rotating speed monitoring safety protection control device of the diesel engine lacks the processing capability of different signals, so that the existing independent rotating speed monitoring safety protection control device of the diesel engine cannot maintain a normal running state under the condition of false alarm, and the normal running of an emergency cooling function of safety-level equipment is further influenced.
Disclosure of Invention
In view of the above, the present invention aims to provide a device and a method for controlling the rotational speed safety protection of a diesel engine, wherein the existing device for controlling the rotational speed safety protection of the diesel engine by monitoring the independent rotational speed of the diesel engine cannot maintain the normal operation state under the condition of false alarm, which affects the normal operation of the emergency cooling function of safety-level equipment.
In order to achieve the above purpose, the technical scheme of the invention is realized as follows:
first aspect
The invention provides a diesel engine rotational speed safety protection control device, comprising:
the rotating speed detection module comprises a plurality of rotating speed sensors for detecting the rotating speed of the diesel engine;
a CPU control module; the system is used for acquiring the rotating speed data of the diesel engine and the emergency working condition override command, and controlling the diesel engine control system to work according to the rotating speed data of the diesel engine and the emergency working condition override command;
a power input/output module; and the power supply module is used for supplying power to the rotating speed detection module and the CPU control module.
Further, the rotation speed detection module comprises at least three rotation speed sensors.
Further, the device also comprises at least three independent power supplies, and each independent power supply is connected with the power input/output module.
Further, the CPU control module comprises a KF32AA151MQV chip.
Second aspect
The invention also provides a diesel engine rotating speed safety protection control method, which comprises the following steps:
acquiring an emergency working condition override command, and acquiring the rotating speed of the diesel engine detected by a rotating speed detection module by using a CPU control module when the emergency working condition override command is acquired, otherwise, controlling a diesel engine control system to work normally;
judging whether the diesel engine is overspeed or not according to the detected rotating speed of the diesel engine, and obtaining a judging result;
controlling a diesel engine control system to work according to the judging result; and when the judging result is that the diesel engine overspeed, controlling the diesel engine control system to stop working, otherwise, not stopping.
Further, the obtaining the emergency working condition override command, when obtaining the emergency working condition override command, using the CPU control module to obtain the rotational speed of the diesel engine detected by the rotational speed detection module, otherwise controlling the normal operation of the diesel engine control system, includes:
acquiring an emergency working condition override command by using a CPU control module;
when the emergency working condition override command is obtained, the rotating speed of the diesel engine detected by the rotating speed detection module is obtained, and an emergency safety protection rule is executed to carry out safety protection control on the diesel engine; under the emergency safety protection rule, controlling the diesel engine to work according to the stopping strategy of the rotating speed limit value of the diesel engine;
when the emergency working condition override command is not obtained, executing a general safety protection rule to perform safety protection control on the diesel engine; under the general safety protection rule, the diesel engine is controlled to work according to the general limit stop strategy of the diesel engine.
Further, the step of judging whether the diesel engine is overspeed according to the detected rotational speed of the diesel engine to obtain a judgment result includes:
when two or more rotation speed sensors in the rotation speed detection module detect that the rotation speed of the diesel engine exceeds an overspeed set value, a judgment result is obtained to be that the diesel engine overspeed, otherwise, the judgment result is obtained to be that the diesel engine does not overspeed.
Compared with the prior art, the device and the method for safely protecting and controlling the rotating speed of the diesel engine have the following advantages:
(1) The device and the method for safely protecting and controlling the rotating speed of the diesel engine can keep the normal running state and ensure the normal emergency cooling function of safety equipment under the condition of false alarm of the nuclear safety diesel engine together with the electronic control system of the nuclear safety diesel engine. In addition, the control device receives multiple paths of independent power supplies provided by the outside through the power input/output module, redundant power supply is realized, and when any path of independent power supply is normal, the control device can work normally, so that the reliability of the control device is improved.
(2) According to the diesel engine rotating speed safety protection control method, after the set condition is achieved (namely, at least two paths of independent rotating speed monitoring signals exceed the overspeed set value) through monitoring the multiple paths of independent diesel engine rotating speed signals, overspeed protection emergency shutdown of the diesel engine is achieved, the risk of false triggering overspeed emergency shutdown of a safety-level emergency diesel engine set is reduced, the reliability requirement of a nuclear safety-level emergency generator set is met, and possible safety accidents are avoided to the greatest extent.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention. In the drawings:
fig. 1 is a schematic structural diagram of a diesel engine rotational speed safety protection control device according to an embodiment of the present invention;
fig. 2 is a flowchart of a diesel engine rotational speed safety protection control method according to a second embodiment of the present invention.
Detailed Description
The invention is described in further detail below with reference to the drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting thereof. It should be further noted that, for convenience of description, only some, but not all of the structures related to the present invention are shown in the drawings.
Example 1
Fig. 1 is a schematic structural diagram of a diesel engine rotational speed safety protection control device according to an embodiment of the present invention, referring to fig. 1, the device includes:
the rotating speed detection module comprises a plurality of rotating speed sensors for detecting the rotating speed of the diesel engine.
Specifically, the rotation speed detection module includes at least three rotation speed sensors. The number of the rotation speed sensors may be three, four or more, and a person skilled in the art may set the rotation speed sensors according to actual needs, or may select a rotation speed sensor with a suitable model according to actual needs, so as to detect the rotation speed of the diesel engine, which is not described herein. Through setting up a plurality of rotation speed sensor, can realize redundant detection, avoid leading to erroneous judgement because of single rotation speed sensor trouble, be favorable to improving this kind of controlling means's reliability.
A CPU control module; the method is used for acquiring the diesel engine rotating speed data and the emergency working condition override command, and controlling the diesel engine control system to work according to the diesel engine rotating speed data and the emergency working condition override command. By way of example, the CPU control module may include a KF32AA151MQV chip. KF32AA151MQV is used as a main chip, the technology is mature, the influence of environmental adaptability and electromagnetic compatibility is considered in the design, the use requirements of various environments can be met, and the reliability is high.
In the practical application process, the signal cable between the CPU control module and the rotating speed detection module can be a marine shielding cable, and is connected to the internal wiring terminal through the wiring stuffing box with the shielding terminal, so that the overall electromagnetic compatibility is ensured to the greatest extent, and the signal is protected from external interference. In addition, in order to avoid interference of external signals, the housing of the device may also be a metal housing, such as a stainless steel housing, and the like, which can be selected by a person skilled in the art according to actual needs, and is not described herein.
A power input/output module; and the power supply module is used for supplying power to the rotating speed detection module and the CPU control module.
Specifically, the device further comprises at least three independent power supplies, and each independent power supply is connected with the power input/output module. By arranging a plurality of independent power supplies to be connected with the power input/output module, a power supply mode with multiple paths of independent redundancies can be formed, and the failure of the safety protection function of the device caused by power supply missing is prevented.
In the practical application process, the independent power supply can adopt a 24VDC power supply, and the corresponding power input/output module can also adopt a model matched with the independent power supply and the CPU control module, so that a person skilled in the art can select the independent power supply according to the practical requirement, and the details are not repeated here.
The diesel engine rotating speed safety protection control device can keep a normal running state and ensure the normal emergency cooling function of safety equipment under the condition of false alarm of a nuclear safety diesel engine together with an electronic control system of the nuclear safety diesel engine. In addition, the control device receives multiple paths of independent power supplies provided by the outside through the power input/output module, redundant power supply is realized, and when any path of independent power supply is normal, the control device can work normally, so that the reliability of the control device is improved.
Example two
Fig. 2 is a flowchart of a control method for protecting the rotational speed safety of a diesel engine according to a second embodiment of the present invention, which is optimized based on the above embodiment, and referring to fig. 2, the control method specifically includes the following steps:
and 101, acquiring an emergency working condition override command, and acquiring the rotating speed of the diesel engine detected by the rotating speed detection module by using the CPU control module when the emergency working condition override command is acquired, otherwise, controlling the normal operation of a diesel engine control system.
Specifically, step 101 may refer to the following steps:
firstly, a CPU control module is utilized to obtain an emergency working condition override command.
When the emergency working condition override command is obtained, the rotating speed of the diesel engine detected by the rotating speed detection module is obtained, and an emergency safety protection rule is executed to carry out safety protection control on the diesel engine; under the emergency safety protection rule, the working of the diesel engine is controlled according to the stopping strategy of the rotating speed limit value of the diesel engine.
When the emergency working condition override command is not obtained, executing a general safety protection rule to perform safety protection control on the diesel engine; under the general safety protection rule, the diesel engine is controlled to work according to the general limit stop strategy of the diesel engine.
In the practical application process, taking a diesel engine for a reactor as an example, when the diesel engine is in normal operation (under a non-emergency working condition, namely under a general safety protection rule), a diesel engine control system executes a general safety protection program, and the limit value shutdown strategies such as diesel engine cooling water temperature, lubricating oil pressure, and monitoring of the engine-side rotating speed of an electric control system are all effective normally. When the reactor cooling system is powered off, the diesel engine receives an external remote control command to judge that the emergency working condition is the emergency working condition (namely, an emergency working condition override command is obtained), the diesel engine is changed to run under an emergency safety protection rule, and at the moment, the limit value shutdown strategies such as the cooling water temperature of the diesel engine, the lubricating oil pressure, the monitoring of the machine side rotating speed of the electric control system and the like are not effective any more, and the automatic safety protection emergency shutdown command is only monitored and output by the rotating speed safety protection device.
And 102, judging whether the diesel engine is overspeed or not according to the detected diesel engine rotating speed, and obtaining a judging result.
Specifically, when two or more rotation speed sensors in the rotation speed detection module detect that the rotation speed of the diesel engine exceeds the overspeed set value, a judgment result is obtained that the diesel engine overspeed, otherwise, the judgment result is obtained that the diesel engine does not overspeed.
In the practical application process, in order to avoid misjudgment caused by the failure of a single rotating speed sensor, at least three rotating speed sensors can be used for detecting the rotating speed of the diesel engine, and here, the three rotating speed sensors are used as an example, through connecting the three rotating speed sensors with a CPU control module, the CPU control module can receive three paths of independent rotating speed frequency signals and compare and judge in an internal program, and only when all the two paths of rotating speed frequency signals exceed a limit value, the CPU control module can output a switching value closing signal and output the switching value closing signal to an emergency stop electromagnetic valve coil of a diesel engine control system to execute an emergency stop command of the diesel engine.
Step 103, controlling a diesel engine control system to work according to the judging result; and when the judging result is that the diesel engine overspeed, controlling the diesel engine control system to stop working, otherwise, not stopping. The diesel engine control system may be a diesel engine model controlled according to actual needs, and the relevant electronic control system corresponding to the model diesel engine is not described herein.
According to the diesel engine rotating speed safety protection control method, after the set condition is achieved (namely, at least two paths of independent rotating speed monitoring signals exceed the overspeed set value) through monitoring the multiple paths of independent diesel engine rotating speed signals, overspeed protection emergency shutdown of the diesel engine is achieved, the risk of false triggering overspeed emergency shutdown of a safety-level emergency diesel engine set is reduced, the reliability requirement of a nuclear safety-level emergency generator set is met, and possible safety accidents are avoided to the greatest extent.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, alternatives, and improvements that fall within the spirit and scope of the invention.
Claims (7)
1. A diesel engine rotational speed safety protection control device, characterized by comprising:
the rotating speed detection module comprises a plurality of rotating speed sensors for detecting the rotating speed of the diesel engine;
a CPU control module; the system is used for acquiring the rotating speed data of the diesel engine and the emergency working condition override command, and controlling the diesel engine control system to work according to the rotating speed data of the diesel engine and the emergency working condition override command;
a power input/output module; and the power supply module is used for supplying power to the rotating speed detection module and the CPU control module.
2. The diesel engine rotational speed safety protection control device according to claim 1, wherein: the rotation speed detection module comprises at least three rotation speed sensors.
3. The diesel engine rotational speed safety protection control device according to claim 1, wherein: the device also comprises at least three independent power supplies, and each independent power supply is connected with the power input/output module.
4. The diesel engine rotational speed safety protection control device according to claim 1, wherein: further, the CPU control module comprises a KF32AA151MQV chip.
5. A control method using the diesel engine rotational speed safety protection control device according to any one of claims 1 to 4, characterized by comprising:
acquiring an emergency working condition override command, and acquiring the rotating speed of the diesel engine detected by a rotating speed detection module by using a CPU control module when the emergency working condition override command is acquired, otherwise, controlling a diesel engine control system to work normally;
judging whether the diesel engine is overspeed or not according to the detected rotating speed of the diesel engine, and obtaining a judging result;
controlling a diesel engine control system to work according to the judging result; and when the judging result is that the diesel engine overspeed, controlling the diesel engine control system to stop working, otherwise, not stopping.
6. The method according to claim 5, wherein the obtaining the emergency condition override command, when obtaining the emergency condition override command, uses the CPU control module to obtain the rotational speed of the diesel engine detected by the rotational speed detection module, otherwise controls the normal operation of the diesel engine control system, includes:
acquiring an emergency working condition override command by using a CPU control module;
when the emergency working condition override command is obtained, the rotating speed of the diesel engine detected by the rotating speed detection module is obtained, and an emergency safety protection rule is executed to carry out safety protection control on the diesel engine; under the emergency safety protection rule, controlling the diesel engine to work according to the stopping strategy of the rotating speed limit value of the diesel engine;
when the emergency working condition override command is not obtained, executing a general safety protection rule to perform safety protection control on the diesel engine; under the general safety protection rule, the diesel engine is controlled to work according to the general limit stop strategy of the diesel engine.
7. The method of claim 5, wherein determining whether the diesel engine is overspeed based on the detected rotational speed of the diesel engine, the determining comprising:
when two or more rotation speed sensors in the rotation speed detection module detect that the rotation speed of the diesel engine exceeds an overspeed set value, a judgment result is obtained to be that the diesel engine overspeed, otherwise, the judgment result is obtained to be that the diesel engine does not overspeed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311499318.4A CN117418951A (en) | 2023-11-10 | 2023-11-10 | Diesel engine rotating speed safety protection control device and method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311499318.4A CN117418951A (en) | 2023-11-10 | 2023-11-10 | Diesel engine rotating speed safety protection control device and method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN117418951A true CN117418951A (en) | 2024-01-19 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202311499318.4A Pending CN117418951A (en) | 2023-11-10 | 2023-11-10 | Diesel engine rotating speed safety protection control device and method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN117418951A (en) |
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2023
- 2023-11-10 CN CN202311499318.4A patent/CN117418951A/en active Pending
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