CN117588297A - Engine over-temperature diagnosis method, device, medium and vehicle controller - Google Patents

Engine over-temperature diagnosis method, device, medium and vehicle controller Download PDF

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Publication number
CN117588297A
CN117588297A CN202311569988.9A CN202311569988A CN117588297A CN 117588297 A CN117588297 A CN 117588297A CN 202311569988 A CN202311569988 A CN 202311569988A CN 117588297 A CN117588297 A CN 117588297A
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China
Prior art keywords
temperature
engine
cooling liquid
over
data
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CN202311569988.9A
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Chinese (zh)
Inventor
王子心
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United Automotive Electronic Systems Co Ltd
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United Automotive Electronic Systems Co Ltd
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Priority to CN202311569988.9A priority Critical patent/CN117588297A/en
Publication of CN117588297A publication Critical patent/CN117588297A/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
    • F01P11/00—Component parts, details, or accessories not provided for in, or of interest apart from, groups F01P1/00 - F01P9/00
    • F01P11/14—Indicating devices; Other safety devices
    • F01P11/16—Indicating devices; Other safety devices concerning coolant temperature
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
    • F01P7/00—Controlling of coolant flow
    • F01P7/14—Controlling of coolant flow the coolant being liquid
    • F01P7/16—Controlling of coolant flow the coolant being liquid by thermostatic control
    • F01P7/165—Controlling of coolant flow the coolant being liquid by thermostatic control characterised by systems with two or more loops
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/40—Engine management systems

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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 relates to the technical field of engines, in particular to an over-temperature diagnosis method and device for an engine, a medium and a vehicle controller, which can be combined with two paths of temperature sensors to finish over-temperature monitoring diagnosis of the engine. The method comprises the steps of collecting the temperature of a radiator as second temperature data, and selecting the first temperature data or the second temperature data which can most respond to the temperature of an engine as a diagnosis basis according to different engine cooling working conditions by analyzing the circulation mode of cooling liquid; the over-temperature diagnosis of the engine can be completed under the condition that any one of the temperatures fails or both of the temperatures are effective, and the stability and the effectiveness of the over-temperature detection of the engine are obviously improved. Because the two paths of temperature sensors are arranged at different positions in the cooling loop, temperature difference is likely to occur, and when the first temperature data and the second temperature data appear on two sides of the full-open threshold, decision data are respectively selected and set according to the two conditions, so that the whole scheme can be stably executed.

Description

Engine over-temperature diagnosis method, device, medium and vehicle controller
Technical Field
The invention relates to the technical field of engines, in particular to an over-temperature diagnosis method and device for an engine, a medium and a vehicle controller.
Background
Engine over temperature generally means that the engine coolant is higher than normal, and normally the engine coolant should be between 90 degrees and 120 degrees, and when the coolant temperature is higher than 120 degrees, the engine over temperature may cause: 1. engine power decreases or fuel economy deteriorates; 2. the automobile engine is easy to generate preignition and deflagration; 3. accelerated wear of engine parts due to poor lubrication; 4. the ignition is difficult or the combustion is slow, and the engine is irreversibly damaged when serious.
Therefore, the monitoring of the working temperature of the engine is the work which needs to be completed by the automobile, the current engine temperature monitoring method is as shown in fig. 1, a cooling liquid temperature sensor is arranged at the position of a thermostat, a whole automobile controller receives temperature data sent by the cooling liquid temperature sensor in real time, whether the engine is over-temperature or not is judged according to the temperature data, and if the over-temperature whole automobile controller adopts necessary means, the engine is forced to be cooled. The defects are that: 1. although the cooling liquid temperature sensor can detect circuit faults and rationality faults every time, the single temperature sensor is arranged in the actual use process, and the faults of engine damage caused by the over-temperature of an engine cooling system are still generated under the condition of no alarm; 2. the cooling liquid has a large circulation and a small circulation, if a second path of temperature sensor is to be added, the selection of the installation position is a problem to be solved, and the diagnosis logic of the second path of temperature sensor and the first path of temperature sensor also needs to be additionally arranged.
Disclosure of Invention
The invention discloses an over-temperature diagnosis method, an over-temperature diagnosis device, a medium and a vehicle controller of an engine, which can be combined with two paths of temperature sensors to finish over-temperature monitoring diagnosis of the engine.
In order to achieve the above purpose, on the one hand, the invention provides a method for diagnosing the over-temperature of an engine, the engine is cooled by cooling liquid, the cooling liquid can form a small cooling cycle with an engine water jacket through a thermostat, a water pump, and the cooling liquid can form a large cycle with the engine water jacket through the thermostat, a radiator, the water pump, and the method for diagnosing the over-temperature of the engine specifically comprises the following steps:
collecting first temperature data at the position of an engine thermostat, and collecting second temperature data at the position of an engine radiator;
and according to the circulation mode of the cooling liquid, selecting the first temperature data or the second temperature data to diagnose whether the engine is over-temperature.
The embodiment has the advantages that the temperature of the radiator is collected to be used as second temperature data, and the first temperature data or the second temperature data which can most respond to the temperature of the engine are selected to be used as diagnosis basis for different engine cooling working conditions by analyzing the circulation mode of the cooling liquid; the over-temperature diagnosis of the engine can be completed under the condition that any one of the temperatures fails or both of the temperatures are effective, and the stability and the effectiveness of the over-temperature detection of the engine are obviously improved.
Further, the method for acquiring the first temperature data and the second temperature data comprises the following steps:
a first path of cooling liquid temperature sensor is arranged at the engine thermostat, and a second path of cooling liquid temperature sensor is arranged at the treatment position of the engine radiator;
and respectively acquiring first temperature data and second temperature data through the first path of cooling liquid temperature sensor and the second path of cooling liquid temperature sensor.
Further, the vehicle controller diagnoses whether the engine is over-temperature according to the selected first temperature data or the second temperature data.
Further, according to the circulation mode of the cooling liquid, the first temperature data or the second temperature data is selected to diagnose whether the engine is over-temperature, and the specific method is as follows:
when the cooling liquid is in small circulation, the first temperature data is used as decision data to diagnose whether the engine is over-temperature or not;
and when the cooling liquid is in large circulation, taking larger values of the first temperature data and the second temperature data as decision data, and diagnosing whether the engine is over-temperature or not.
The embodiment has the advantages that two groups of different temperature data can be generated by introducing two paths of temperature sensors, and the problem of decision data selection is perfectly solved by logic analysis of large and small circulation of cooling liquid.
Further, the manner of judging the small circulation or the large circulation of the cooling liquid is as follows:
calibrating a thermostat full-open threshold T;
when the first temperature data T1 is more than or equal to T and T2 is more than or equal to T, the cooling liquid is in large circulation;
when the first temperature data T1< T and T2< T, the coolant is in a small circulation.
The advantage of this embodiment is that according to the fully open threshold of the thermostat as a transition boundary between large and small cycles, the coolant can be judged to be large-cycle when both the first temperature data and the second temperature data are greater than the fully open threshold, whereas the thermostat is not fully open and is judged to be small-cycle.
Further, when the first temperature data T1> T and the second temperature data T2< T, diagnosing whether the engine is over-temperature or not by taking the first temperature data as decision data;
when the first temperature data T1< T and the second temperature data T2> T, the second temperature data is used as decision data to diagnose whether the engine is over-temperature.
The embodiment has the advantages that as the two paths of temperature sensors are arranged at different positions in the cooling loop, temperature difference is likely to occur, when the first temperature data and the second temperature data appear on two sides of the full-open threshold, the selection problem of decision data occurs, and the selection setting of the decision data is respectively made for two conditions through specific analysis, so that the logic trust problem caused by the difference of the two paths of temperature data can be avoided, and the whole scheme can be stably executed.
Further, when the decision data is greater than the fault threshold, the engine is diagnosed as over-temperature; and when the decision data is smaller than the fault threshold value, diagnosing the engine as normal operation.
Optionally, after the whole vehicle is electrified and the engine runs, fault detection of the first path of cooling liquid temperature sensor and the second path of cooling liquid temperature sensor is finished;
if the first path of cooling liquid temperature sensor and the second path of cooling liquid temperature sensor have no faults, selecting first temperature data or second temperature data to diagnose whether the engine is over-temperature or not according to a circulation mode of cooling liquid;
and if the first path of cooling liquid temperature sensor and/or the second path of cooling liquid temperature sensor are/is in fault, the fault alarms and controls the engine to stop.
Optionally, after the whole vehicle is electrified and the engine runs, fault detection of the first path of cooling liquid temperature sensor and the second path of cooling liquid temperature sensor is finished;
if the first path of cooling liquid temperature sensor and the second path of cooling liquid temperature sensor have no faults, selecting first temperature data or second temperature data to diagnose whether the engine is over-temperature or not according to a circulation mode of cooling liquid;
if the first path of cooling liquid temperature sensor or the second path of cooling liquid temperature sensor fails, selecting data acquired by the second path of cooling liquid temperature sensor or the first path of cooling liquid temperature sensor without failure as decision data, and diagnosing whether the engine is over-temperature or not.
The embodiment has the advantages that when one path of temperature sensor fails, the monitoring and diagnosis of the over-temperature of the engine can still be completed, and the normal operation of the engine can be ensured under emergency conditions.
Further, the fault detection of the first path of coolant temperature sensor and the second path of coolant temperature sensor includes: circuit fault detection and rationality fault detection.
To achieve the above object, in another aspect, there is provided an engine overheat diagnosis device comprising: the system comprises a first temperature acquisition module, a second temperature acquisition module and an over-temperature diagnosis module;
the first temperature acquisition module acquires first temperature data at the position of an engine thermostat;
the second temperature acquisition module acquires second temperature data at the engine radiator;
the over-temperature diagnosis module selects the first temperature data or the second temperature data to diagnose whether the engine is over-temperature or not according to the circulation mode of the cooling liquid.
To achieve the above object, in another aspect, there is provided a storage medium storing a plurality of instructions, a processor loaded to execute the engine over-temperature diagnosis method according to any one of claims 1 to 10.
To achieve the above object, in another aspect, there is provided a vehicle control unit for controlling a hybrid vehicle or a fuel vehicle, comprising the engine overheat diagnosis device of claim 11, and/or the storage medium of claim 12.
It should be noted that, the terms "first", "second", and the like are used herein merely to describe each component in the technical solution, and do not constitute a limitation on the technical solution, and are not to be construed as indicating or implying importance of the corresponding component; elements with "first", "second" and the like mean that in the corresponding technical solution, the element includes at least one.
Drawings
In order to more clearly illustrate the technical solution of the present invention, the technical effects, technical features and objects of the present invention will be further understood, and the present invention will be described in detail below with reference to the accompanying drawings, which form a necessary part of the specification, and together with the embodiments of the present invention serve to illustrate the technical solution of the present invention, but not to limit the present invention.
Like reference numerals in the drawings denote like parts, in particular:
fig. 1 is a diagram illustrating a conventional engine over-temperature monitoring method in the background art.
FIG. 2 is a schematic diagram showing the large and small circulation of the cooling liquid in example 1.
Fig. 3 is a schematic diagram of the diagnostic flow in example 1.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. Of course, the following specific examples are set forth only to illustrate the technical solution of the present invention, and are not intended to limit the present invention. Furthermore, the parts expressed in the examples or drawings are merely illustrative of the relevant parts of the present invention, and not all of the present invention.
Example 1:
in the method for circulating engine cooling liquid, as shown in fig. 2, the engine is cooled by cooling liquid, the cooling liquid can form small cooling circulation with the water jacket of the engine through a thermostat, a water pump and the cooling liquid can form large circulation with the water jacket of the engine through the thermostat, a radiator and the water pump.
An engine over-temperature diagnosis method, as shown in fig. 3, comprises the following specific steps:
s0, after the whole vehicle is electrified and the engine runs, fault detection of a first path of cooling liquid temperature sensor and a second path of cooling liquid temperature sensor is finished; if the first path of cooling liquid temperature sensor and the second path of cooling liquid temperature sensor have no faults, selecting first temperature data or second temperature data to diagnose whether the engine is over-temperature or not according to a circulation mode of cooling liquid; and if the first path of cooling liquid temperature sensor and/or the second path of cooling liquid temperature sensor are/is in fault, the fault alarms and controls the engine to stop.
As an alternative means, if the first path of cooling liquid temperature sensor and the second path of cooling liquid temperature sensor have no faults, selecting the first temperature data or the second temperature data to diagnose whether the engine is over-temperature or not according to the circulation mode of the cooling liquid;
if the first path of cooling liquid temperature sensor or the second path of cooling liquid temperature sensor fails, selecting data acquired by the second path of cooling liquid temperature sensor or the first path of cooling liquid temperature sensor without failure as decision data, and diagnosing whether the engine is over-temperature or not.
Specifically, fault detection of the first path coolant temperature sensor and the second path coolant temperature sensor includes: circuit fault detection and rationality fault detection.
S1, collecting first temperature data at the position of an engine thermostat, and collecting second temperature data at the position of an engine radiator.
Specifically, a first path of cooling liquid temperature sensor is installed at an engine thermostat, and a second path of cooling liquid temperature sensor is installed at an engine radiator disposal; and respectively acquiring first temperature data and second temperature data through the first path of cooling liquid temperature sensor and the second path of cooling liquid temperature sensor.
S2, according to a circulation mode of the cooling liquid, selecting the first temperature data or the second temperature data to diagnose whether the engine is over-temperature.
Specifically, the vehicle controller diagnoses whether the engine is over-temperature according to the selected first temperature data or the second temperature data.
Specifically, according to the circulation mode of the cooling liquid, the first temperature data or the second temperature data is selected to diagnose whether the engine is over-temperature, and the specific method is as follows:
s21, when the cooling liquid circulates in a small way, diagnosing whether the engine is over-temperature or not by taking the first temperature data as decision data; calibrating the full-open threshold T of the thermostat, and when the first temperature data T1< T and T2< T, the cooling liquid is in small circulation.
S22, when the cooling liquid is in large circulation, taking larger values of the first temperature data and the second temperature data as decision data, and diagnosing whether the engine is over-temperature or not; and calibrating a full-open threshold T of the thermostat, wherein when the first temperature data T1 is more than or equal to T and T2 is more than or equal to T, the cooling liquid is in large circulation.
S23, when the first temperature data T1> T and the second temperature data T2< T, diagnosing whether the engine is over-temperature or not by taking the first temperature data as decision data;
s24, when the first temperature data T1< T and the second temperature data T2> T, diagnosing whether the engine is over-temperature or not by taking the second temperature data as decision data.
S25, when the decision data is larger than a fault threshold value, diagnosing the engine as over-temperature; and when the decision data is smaller than the fault threshold value, diagnosing the engine as normal operation.
Example 2:
an engine over-temperature diagnostic device comprising: the system comprises a first temperature acquisition module, a second temperature acquisition module and an over-temperature diagnosis module;
the first temperature acquisition module acquires first temperature data at the position of an engine thermostat;
the second temperature acquisition module acquires second temperature data at the engine radiator;
the over-temperature diagnosis module selects the first temperature data or the second temperature data to diagnose whether the engine is over-temperature or not according to the circulation mode of the cooling liquid.
In this embodiment, the first temperature acquisition module and the second temperature acquisition module may be sensors, or may be a processor with a data transceiver function; the over-temperature diagnosis module can be a local whole vehicle controller of the vehicle, can be other chips or terminals which are installed in the vehicle and have information processing capability, and can be a cloud server which can interact with vehicle data.
It should be noted that the foregoing examples are merely for clearly illustrating the technical solution of the present invention, and those skilled in the art will understand that the embodiments of the present invention are not limited to the foregoing, and that obvious changes, substitutions or alterations can be made based on the foregoing without departing from the scope covered by the technical solution of the present invention; other embodiments will fall within the scope of the invention without departing from the inventive concept.

Claims (13)

1. The engine over-temperature diagnosis method is characterized in that the engine is cooled by cooling liquid, the cooling liquid can form small cooling circulation through a thermostat, a water pump and an engine water jacket, and the cooling liquid can form large cooling circulation through the thermostat, a radiator, the water pump and the engine water jacket, and the engine over-temperature diagnosis method is characterized in that the specific method comprises the following steps of:
collecting first temperature data at the position of an engine thermostat, and collecting second temperature data at the position of an engine radiator;
and according to the circulation mode of the cooling liquid, selecting the first temperature data or the second temperature data to diagnose whether the engine is over-temperature.
2. The engine over-temperature diagnostic method according to claim 1, characterized in that the acquisition method of the first temperature data and the second temperature data is as follows:
a first path of cooling liquid temperature sensor is arranged at the engine thermostat, and a second path of cooling liquid temperature sensor is arranged at the treatment position of the engine radiator;
and respectively acquiring first temperature data and second temperature data through the first path of cooling liquid temperature sensor and the second path of cooling liquid temperature sensor.
3. The engine over-temperature diagnostic method as set forth in claim 1 wherein the vehicle controller diagnoses whether the engine is over-temperature based on the selected first temperature data or the second temperature data.
4. The engine over-temperature diagnosis method according to claim 1, wherein the first temperature data or the second temperature data is selected to diagnose whether the engine is over-temperature according to a circulation manner of the coolant, the method comprising:
when the cooling liquid is in small circulation, the first temperature data is used as decision data to diagnose whether the engine is over-temperature or not;
and when the cooling liquid is in large circulation, taking larger values of the first temperature data and the second temperature data as decision data, and diagnosing whether the engine is over-temperature or not.
5. The engine over-temperature diagnostic method according to claim 4, characterized in that the manner of determining the small cycle or the large cycle of the coolant is as follows:
calibrating a thermostat full-open threshold T;
when the first temperature data T1 is more than or equal to T and T2 is more than or equal to T, the cooling liquid is in large circulation;
when the first temperature data T1< T and T2< T, the coolant is in a small circulation.
6. The engine over-temperature diagnostic method according to claim 5, characterized in that when the first temperature data T1> T and the second temperature data T2< T, it is diagnosed whether the engine is over-temperature using the first temperature data as decision data;
when the first temperature data T1< T and the second temperature data T2> T, the second temperature data is used as decision data to diagnose whether the engine is over-temperature.
7. The engine over-temperature diagnostic method as set forth in claim 6, wherein the engine is diagnosed as over-temperature when the decision data is greater than the failure threshold; and when the decision data is smaller than the fault threshold value, diagnosing the engine as normal operation.
8. The engine over-temperature diagnosis method according to claim 2, wherein after the whole vehicle is powered on and the engine is operated, fault detection of the first path of cooling liquid temperature sensor and the second path of cooling liquid temperature sensor is completed;
if the first path of cooling liquid temperature sensor and the second path of cooling liquid temperature sensor have no faults, selecting first temperature data or second temperature data to diagnose whether the engine is over-temperature or not according to a circulation mode of cooling liquid;
and if the first path of cooling liquid temperature sensor and/or the second path of cooling liquid temperature sensor are/is in fault, the fault alarms and controls the engine to stop.
9. The engine over-temperature diagnosis method according to claim 2, wherein after the whole vehicle is powered on and the engine is operated, fault detection of the first path of cooling liquid temperature sensor and the second path of cooling liquid temperature sensor is completed;
if the first path of cooling liquid temperature sensor and the second path of cooling liquid temperature sensor have no faults, selecting first temperature data or second temperature data to diagnose whether the engine is over-temperature or not according to a circulation mode of cooling liquid;
if the first path of cooling liquid temperature sensor or the second path of cooling liquid temperature sensor fails, selecting data acquired by the second path of cooling liquid temperature sensor or the first path of cooling liquid temperature sensor without failure as decision data, and diagnosing whether the engine is over-temperature or not.
10. The engine over-temperature diagnostic method according to claim 8 or 9, characterized in that the fault detection of the first-path coolant temperature sensor and the second-path coolant temperature sensor includes: circuit fault detection and rationality fault detection.
11. An engine over-temperature diagnostic device, comprising: the system comprises a first temperature acquisition module, a second temperature acquisition module and an over-temperature diagnosis module;
the first temperature acquisition module acquires first temperature data at the position of an engine thermostat;
the second temperature acquisition module acquires second temperature data at the engine radiator;
the over-temperature diagnosis module selects the first temperature data or the second temperature data to diagnose whether the engine is over-temperature or not according to the circulation mode of the cooling liquid.
12. A storage medium having stored thereon instructions, a processor loaded to perform the engine over temperature diagnostic method of any one of claims 1 to 10.
13. A vehicle control unit for controlling a hybrid vehicle or a fuel vehicle, comprising the engine over-temperature diagnosis device according to claim 11, and/or the storage medium according to claim 12.
CN202311569988.9A 2023-11-23 2023-11-23 Engine over-temperature diagnosis method, device, medium and vehicle controller Pending CN117588297A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202311569988.9A CN117588297A (en) 2023-11-23 2023-11-23 Engine over-temperature diagnosis method, device, medium and vehicle controller

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202311569988.9A CN117588297A (en) 2023-11-23 2023-11-23 Engine over-temperature diagnosis method, device, medium and vehicle controller

Publications (1)

Publication Number Publication Date
CN117588297A true CN117588297A (en) 2024-02-23

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Family Applications (1)

Application Number Title Priority Date Filing Date
CN202311569988.9A Pending CN117588297A (en) 2023-11-23 2023-11-23 Engine over-temperature diagnosis method, device, medium and vehicle controller

Country Status (1)

Country Link
CN (1) CN117588297A (en)

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