A heat dissipation system fault self-diagnosis method and engineering machinery

Abstract

The application discloses a heat dissipation system fault self-diagnosis method and engineering machinery. The method obtains the environment temperature where the heat dissipation system is located, the water inlet temperature of the radiator, the water outlet temperature of the radiator, the engine water temperature and the wind speed on the windward surface of the radiator, determines the working state of the heat dissipation system based on the environment temperature, the temperature difference between the water inlets and outlets of the radiator and the resistance of the radiator, and realizes the self-diagnosis of the fault mode of the heat dissipation system. The application realizes the self-diagnosis of the fault mode of the heat dissipation system, guides the customers and service personnel to make fault judgment, and thus the fault can be quickly eliminated.

Description

Technical Field

[0001] This invention belongs to the technical field of heat dissipation systems for engineering machinery, specifically relating to a self-diagnosis method for heat dissipation system faults and engineering machinery. Background Technology

[0002] The following fault modes exist in the cooling systems of construction machinery: insufficient cooling capacity due to excessively high ambient temperature, insufficient coolant, clogged radiator fins, damaged fan, damaged belt, damaged thermostat preventing the large circulation loop from opening, and poor circulation within the radiator's internal channels. All of these fault modes can cause the machine to overheat. The cooling system is equipped with a temperature sensor; when the coolant temperature exceeds the set temperature, the machine will trigger a high-temperature alarm, alerting the customer and service personnel to the machine malfunction. In existing technology, there are no other warning messages besides the alarm when the coolant overheats. Often, insufficient coolant or a clogged radiator due to prolonged lack of cleaning will cause the high-temperature alarm. While customers are capable of handling the issue, they often cannot determine the fault mode and can only report it to service for troubleshooting. Service personnel have limited inspection methods and cannot quickly and accurately determine the cause of the fault, easily leading to misdiagnosis and rework. Summary of the Invention

[0003] The purpose of this invention is to provide a self-diagnosis method for heat dissipation system faults and engineering machinery, which realizes self-diagnosis of heat dissipation system fault modes based on ambient temperature, temperature difference between radiator inlet and outlet, and radiator resistance.

[0004] To achieve the above objectives, the technical solution adopted by the present invention is as follows: This invention provides a self-diagnosis method for heat dissipation system faults, comprising: Obtain the ambient temperature T0 of the cooling system, the radiator inlet temperature T1, the radiator outlet temperature T2, and the engine coolant temperature T. f And the wind speed S1 on the windward side of the radiator, and calculate the temperature difference ΔT between the radiator inlet and outlet based on the radiator inlet temperature and the radiator outlet temperature. When T f >T n hour, If T0>T m If the temperature exceeds the permissible ambient temperature, it is diagnosed as exceeding the allowable ambient temperature; where T m T represents the highest permissible ambient temperature for the machine. n This is the alarm temperature for the coolant. If T0≤T m If ΔT = 0, then the diagnosis is a thermostat malfunction; If T0≤T m And △T≠0, and S1<λS n If the radiator is blocked, the diagnosis is radiator blockage; where λ is the safety factor λ for the system resistance of the radiator not exceeding the limit, and S nThe airflow velocity at the front of the heatsink at the current fan speed n; If T0≤T m And △T≠0, and S1≥λS n If the problem persists, human-computer interaction should be used to confirm whether the coolant, fan, and belt are abnormal; if none of them are abnormal, the diagnosis is poor circulation inside the radiator.

[0005] Furthermore, the method also includes: Conduct real-vehicle thermal balance tests to determine the maximum permissible ambient temperature T for the construction machinery containing the cooling system. m and coolant alarm temperature T n .

[0006] Furthermore, the method also includes: The resistance of a brand-new radiator was measured under standard vehicle conditions, and the relationship curve between the fan and the airflow speed at the radiator's frontal surface was calibrated. as well as, The actual vehicle is calibrated with a safety factor λ. If the safety factor is exceeded, the radiator's heat dissipation capacity will not meet the vehicle's overall heat dissipation requirements.

[0007] Furthermore, if T0 > T m It also includes, An alarm signal is sent to the instrument, which then alarms and indicates that the water temperature is too high.

[0008] Furthermore, if T0≤T m And △T=0, also includes, An alarm signal is sent to the instrument, which then alarms and indicates that the water temperature is too high.

[0009] Furthermore, if T0≤T m And △T≠0, and S1<λS n It also includes, An alarm signal is sent to the instrument, which then alarms and prompts: Radiator is blocked, please stop the machine and clean it.

[0010] Furthermore, if T0≤T m And △T≠0, and S1≥λS n Then, a human-computer interaction check will be performed to confirm whether the coolant level is sufficient. If yes, the instrument panel will alarm and prompt: Stop the machine and add coolant; the diagnosis is low coolant. If no, check if the fan is damaged. If yes, the instrument panel will alarm and prompt: stop the machine and replace the fan; the diagnosis is fan damage; if not, check if the belt is abnormal. If yes, the instrument will alarm and indicate: Stop the machine to repair the belt; the diagnosis is belt malfunction; if no, the diagnosis is poor circulation inside the radiator.

[0011] Furthermore, the diagnostic results are displayed in the form of background fault codes.

[0012] The present invention also provides an engineering machinery, including a heat dissipation system, wherein the heat dissipation system is used for fault diagnosis by the above-mentioned heat dissipation system fault self-diagnosis method.

[0013] The beneficial effects of this invention are as follows: This invention, based on ambient temperature, the temperature difference between the radiator inlet and outlet, and radiator resistance, combined with relevant parameters of the cooling system itself, compares and interacts with the system to determine the fault mode, thus achieving self-diagnosis of the cooling system's fault modes. Based on this method, customers and service personnel can be guided to make fault judgments, thereby quickly troubleshooting the problem. Attached Figure Description

[0014] Figure 1 A schematic diagram of a heat dissipation system provided in an embodiment of the present invention; Figure 2 A flowchart of a self-diagnosis method for a heat dissipation system fault provided in an embodiment of the present invention. Detailed Implementation

[0015] The specific embodiments of the present invention will be described in further detail below with reference to the accompanying drawings and examples. The embodiments described below with reference to the accompanying drawings are illustrative and intended to explain the present invention, and should not be construed as limiting the present invention.

[0016] It should be noted that, as used in this invention, "an embodiment" or "embodiment" refers to a specific feature, structure, or characteristic that can be included in at least one implementation of this invention. The phrase "in one embodiment" appearing in different places in this specification does not necessarily refer to the same embodiment, nor is it a single or selective embodiment that excludes other embodiments.

[0017] The specific embodiments of the present invention will be described in further detail below with reference to the accompanying drawings. The following examples are for illustrative purposes only and are not intended to limit the scope of the invention.

[0018] This invention aims to provide a self-diagnosis method for heat dissipation system faults, the heat dissipation system being described below. Figure 1 ,include: Radiator: A component used to dissipate heat from antifreeze, intercooling fluid, or hydraulic oil; Fan: A fan blade driven by an engine or hydraulic motor, used to drive air to cool the radiator; it can also be an electric fan.

[0019] To achieve self-diagnosis of faults in the aforementioned heat dissipation system, the following settings are implemented in this embodiment: A1. Install four temperature sensors to measure: ambient temperature T0, radiator inlet temperature T1, radiator outlet temperature T2, and engine coolant temperature T3. f ; A2. Install a wind speed sensor to measure the wind speed S1 on the windward side of the radiator; A3. Controller, used to receive signals, process data, and issue commands.

[0020] To achieve self-diagnosis of the above-mentioned heat dissipation system, the following tests are also performed in advance in this embodiment: B1. Conduct actual vehicle thermal balance tests to determine the maximum permissible ambient temperature T for the construction machinery. m and coolant alarm temperature T n ; B2. Measure the resistance of a brand-new radiator under standard vehicle conditions and calibrate the radiator's frontal wind speed S at fan speed n. n ; It should be noted that the calibration result is a relationship curve, with each rotational speed corresponding to a wind speed; B3. The system resistance of the radiator is set to a safety factor λ that does not exceed the limit. It should be noted that this safety factor is determined by actual vehicle calibration. If this factor is exceeded, the radiator's heat dissipation capacity will not meet the overall vehicle heat dissipation requirements.

[0021] Based on the above configuration, this embodiment of the invention provides a self-diagnosis method for heat dissipation system faults, see [link to relevant documentation]. Figure 2 The details are as follows: Obtain ambient temperature T0, radiator inlet temperature T1, radiator outlet temperature T2, and engine coolant temperature T. f And the wind speed S1 on the windward side of the radiator, calculate the temperature difference ΔT between the radiator inlet and outlet; When T f >T n hour, If T0>T m If the temperature exceeds the allowable temperature of the cooling system, the controller will send an alarm signal to the instrument, which will then alarm and indicate that the water temperature is too high; background fault code: Exceeding allowable ambient temperature; If T0≤T m If ΔT=0, then the controller sends an alarm signal to the instrument, which will alarm and indicate that the water temperature is too high; background fault code: thermostat fault; If T0≤T m And △T≠0, and S1<λS n If the controller sends an alarm signal to the instrument, the instrument will alarm and prompt: Radiator blocked, please stop the machine and clean it; background fault code: Radiator blocked; If T0≤T m And △T≠0, and S1≥λS n Then, a human-computer interaction check will be performed to confirm whether the coolant level is sufficient. If yes, the instrument panel will alarm and prompt: Stop the machine and add coolant; background fault code: Coolant low; if not, check if the fan is damaged. If yes, the instrument panel will alarm and prompt: Stop the machine and replace the fan; background fault code: Fan damaged; if not, check if the belt is abnormal. If yes, the instrument will alarm and prompt: Stop the machine to repair the belt; background fault code: belt abnormality; if no, it is determined that the water temperature is too high, and the background fault code: poor circulation inside the radiator.

[0022] The self-diagnosis method for heat dissipation system faults provided in this invention is widely applicable to systems including the above-mentioned... Figure 1 The engineering machinery shown has a heat dissipation system.

[0023] Terminology Explanation Thermostat: A component that automatically adjusts the amount of water entering the radiator and regulates the water circulation range based on the coolant temperature.

[0024] Large circulation: The cooling circulation in which coolant flows through the cooling passages of the engine and radiator.

[0025] Small circulation: The cooling circulation in which coolant flows through the engine's cooling channels.

[0026] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the specific implementation of the present invention. Any modifications or equivalent substitutions that do not depart from the spirit and scope of the present invention should be covered within the scope of protection of the claims of the present invention.

Claims

1. A self-diagnostic method for a heat dissipation system, characterized in that, include: Obtain the ambient temperature T0 of the cooling system, the radiator inlet temperature T1, the radiator outlet temperature T2, and the engine coolant temperature T. f And the wind speed S1 on the windward side of the radiator, and calculate the temperature difference ΔT between the radiator inlet and outlet based on the radiator inlet temperature and the radiator outlet temperature. When T f >T n hour, If T0>T m If the temperature exceeds the permissible ambient temperature, it is diagnosed as exceeding the allowable ambient temperature; where T m T represents the highest permissible ambient temperature for the machine. n This is the alarm temperature for the coolant. If T0≤T m If ΔT = 0, then the diagnosis is a thermostat malfunction; If T0≤T m And △T≠0, and S1<λS n If the radiator is blocked, the diagnosis is radiator blockage; where λ is the safety factor λ for the system resistance of the radiator not exceeding the limit, and S n The airflow velocity at the front of the heatsink at the current fan speed n; If T0≤T m And △T≠0, and S1≥λS n If the problem persists, human-computer interaction should be used to confirm whether the coolant, fan, and belt are abnormal; if none of them are abnormal, the diagnosis is poor circulation inside the radiator.

2. The self-diagnosis method for a heat dissipation system fault according to claim 1, characterized in that, The method further includes: Conduct real-vehicle thermal balance tests to determine the maximum permissible ambient temperature T for the construction machinery containing the cooling system. m and coolant alarm temperature T n .

3. The self-diagnosis method for a heat dissipation system fault according to claim 1, characterized in that, The method further includes: The resistance of a brand-new radiator was measured under standard vehicle conditions, and the relationship curve between the fan and the airflow speed at the radiator's frontal surface was calibrated. as well as, The actual vehicle is calibrated with a safety factor λ. If the safety factor is exceeded, the radiator's heat dissipation capacity will not meet the vehicle's overall heat dissipation requirements.

4. The self-diagnosis method for a heat dissipation system fault according to claim 1, characterized in that, If T0>T m It also includes, An alarm signal is sent to the instrument, which then alarms and indicates that the water temperature is too high.

5. The self-diagnosis method for a heat dissipation system fault according to claim 1, characterized in that, If T0≤T m And △T=0, also includes, An alarm signal is sent to the instrument, which then alarms and indicates that the water temperature is too high.

6. The self-diagnosis method for a heat dissipation system fault according to claim 1, characterized in that, If T0≤T m And △T≠0, and S1<λS n It also includes, An alarm signal is sent to the instrument, which then alarms and prompts: Radiator is blocked, please stop the machine and clean it.

7. The self-diagnosis method for a heat dissipation system fault according to claim 1, characterized in that, If T0≤T m And △T≠0, and S1≥λS n Then, a human-computer interaction check will be performed to confirm whether the coolant level is sufficient. If yes, the instrument panel will alarm and prompt: Stop the machine and add coolant; the diagnosis is low coolant. If no, check if the fan is damaged. If yes, the instrument panel will alarm and prompt: stop the machine and replace the fan; the diagnosis is fan damage; if not, check if the belt is abnormal. If yes, the instrument will alarm and indicate: Stop the machine to repair the belt; the diagnosis is belt malfunction; if no, the diagnosis is poor circulation inside the radiator.

8. A self-diagnosis method for a heat dissipation system fault according to claim 1 or 7, characterized in that, The diagnostic results are displayed in the form of background fault codes.

9. An engineering machine, comprising a heat dissipation system, characterized in that, The heat dissipation system is diagnosed using the self-diagnosis method for heat dissipation system faults as described in any one of claims 1 to 8.

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