Diesel engine unit-oriented multi-mode thermal management method and system and computer equipment

Abstract

The invention relates to the technical field of internal combustion engine heat management, in particular to a multi-mode heat management method and system for a diesel engine unit and computer equipment. According to the method, the temperature of a key part is collected in real time through an embedded sensor, surface heat distribution is monitored through an infrared thermal imaging technology, and a diesel engine is divided into a core hot area and an auxiliary hot area in combination with thermal load intensity evaluation. Based on the division, three types of thermal management modes, namely an emergency mode, a balance mode and a low consumption mode, are defined, cooling resource configuration is dynamically adjusted according to different operation states, and meanwhile, the system is quickly repaired and optimized through abnormality positioning, resource recombination and energy efficiency rebalance under abnormal conditions. According to the method, the intelligent level, reliability and energy efficiency performance of the diesel engine heat management system are effectively improved, and the method is suitable for diesel engine operation requirements under complex working conditions.

Description

Technical Field

[0001] The present invention relates to the technical field of internal combustion engine thermal management, and in particular to a multi-mode thermal management method, system and computer equipment for diesel engine sets. Background Art

[0002] Diesel engines are widely used in industries such as industry and transportation, and their thermal management performance directly impacts reliability, economy, and service life. Diesel engine thermal management systems typically employ fixed cooling strategies, which struggle to adapt to the dynamic changes in thermal loads under complex operating conditions. This can lead to problems such as overheating of core components, waste of cooling resources, and low energy efficiency.

[0003] In the field of diesel engine thermal management, existing technologies, such as the solution disclosed in CN 109209569 B, primarily achieve temperature control of the aftertreatment system through coordinated regulation of an electronic wastegate (EWG), intake air throttle (IAT), and exhaust air throttle (EAT). However, this approach has the following limitations:

[0004] 1. The thermal management area of the diesel engine body is not finely divided, making it difficult to implement differentiated cooling strategies for the high-load hot zones of key components such as the turbocharger and cylinder head, which may lead to the risk of overheating of core components or unreasonable allocation of cooling resources.

[0005] 2. The adjustment of EWG, IAT, and EAT is triggered in sequence only through temperature thresholds, and an independent thermal management mode covering multiple working conditions such as emergency response, steady-state operation, and low load is not built.

[0006] 3. For dynamic scenarios such as delayed cooling of the core hot zone and sudden load changes, the existing solutions rely on single throttle valve adjustment or afterburning fuel injection, and no dynamic adjustment mechanism for cooling priority is established.

[0007] 4. The self-recovery mechanism after a fault is not disclosed. When the main cooling fan fails or the coolant leaks, the system cannot be maintained through resource reorganization. There is also a lack of energy efficiency rebalancing optimization based on historical data, resulting in difficulty in quickly recovering system performance after the fault is repaired. Summary of the Invention

[0008] To address these shortcomings, the present invention proposes a multi-mode thermal management method, system, and computer device for diesel engine sets. By utilizing thermal zoning, dynamic multi-mode switching, differentiated cooling strategies, and a three-stage self-recovery mechanism, this method addresses existing issues such as insufficient thermal management refinement, single-mode operation, delayed dynamic response, and inefficient fault recovery. This method improves the thermal stability and energy efficiency of diesel engines under complex operating conditions.

[0009] The technical solutions of the present invention are as follows:

[0010] One of the technical solutions of the present invention is to provide a multi-mode thermal management method for a diesel engine set, comprising:

[0011] Embedded sensors collect the temperature of key parts of the diesel engine in real time, and infrared thermal imaging technology is used to monitor the heat distribution on the engine surface. The thermal management area of the diesel engine is divided into core thermal zones and auxiliary thermal zones according to the intensity of the heat load.

[0012] Based on the thermal zoning and operating status of the diesel engine, three thermal management modes are divided into emergency mode, balanced mode, and low-consumption mode, and the trigger conditions are defined;

[0013] Through dual-stage cooling enhancement, air-liquid cooling coupling control and waste heat recovery strategy, differentiated cooling resource allocation and energy efficiency optimization are driven in emergency mode, balanced mode and low-consumption mode;

[0014] Dynamically adjust cooling priorities and heat dissipation resource allocation to ensure thermal stability in scenarios such as delayed cooling in the core area and sudden load changes.

[0015] Through the three-stage self-recovery mechanism of abnormality positioning, resource reorganization, and energy efficiency rebalancing, the system can be quickly repaired and energy efficiency optimized after diesel engine failure.

[0016] As a further option of this method, the embedded sensors are deployed in the cylinder block, turbocharger, exhaust manifold and oil pan of the diesel engine to collect temperature data in real time and transmit it synchronously to the electronic control unit;

[0017] The infrared thermal imaging technology uses an infrared camera with a resolution of ≥640×480 pixels and a thermal sensitivity of ≤0.05°C to monitor the surface heat distribution of the diesel engine at a frame rate of ≥30 Hz, and calibrates the field of view to cover the main area of the engine through a three-dimensional model.

[0018] As a further option of this method, the heat load intensity assessment is dynamically calculated by heat load index, and the formula is:

[0019]

[0020] Where HLI is the heat load index, α, β, and γ are weight coefficients, representing the contribution of steady-state temperature, temperature change rate, and load to heat load, respectively; T max It is the maximum value of the real-time temperature data obtained by embedded sensors or infrared thermal imaging technology; is the temperature change rate, obtained by time series difference of sensor data; P load is the diesel engine load parameter;

[0021] The core hot zone is defined as an area with a continuous HLI ≥ 20 or an instantaneous HLI peak ≥ 25, and includes thermal deformation-sensitive components and key power output areas. The auxiliary hot zone is defined as an area with an HLI of 8 to 20 and heat dissipation redundancy. The division is based on a three-dimensional stress model and manual boundary review and correction.

[0022] As a further option of this method, the triggering conditions and measures of the emergency mode include:

[0023] Trigger conditions: The core hot zone temperature exceeds the material tolerance threshold, or the main cooling system fails and the backup resource reorganization fails;

[0024] Response measures: Initiate dual-stage cooling enhancement to increase coolant circulation rate, activate the turbocharger's independent water cooling circuit, shut down non-critical cooling equipment, and limit engine power output through the ECU;

[0025] In the two-stage cooling enhancement, the turbocharger's independent water cooling circuit is activated when the temperature exceeds a safety threshold, and the coolant pump speed is dynamically adjusted according to the real-time temperature of the core hot zone.

[0026] As a further option of this method, the triggering conditions and control strategies of the balancing mode include:

[0027] Trigger conditions: The diesel engine is in steady-state load and the regional temperature difference is less than 10°C;

[0028] Control strategy: Dynamically coordinate the main cooling fan and coolant pump speed to match the load ratio, intermittently run the intercooler fan based on intake temperature fluctuations, and adjust the thermostat opening in real time to optimize the coolant distribution path.

[0029] As a further option of this method, the triggering conditions and energy-saving measures of the low-consumption mode include:

[0030] Trigger conditions: diesel engine shutdown or load below 30%;

[0031] Energy-saving measures: Turn off the main cooling fan and the independent water cooling system of the turbocharger, start the thermoelectric conversion module to convert waste heat into electricity, and dynamically adjust the coolant circulation rate to the minimum demand threshold.

[0032] As a further option of this method,

[0033] The dynamically adjusting cooling priority includes:

[0034] When the core hot zone lags behind in cooling, the coolant pump speed is increased and the electric auxiliary pump is started, while the intercooler heat dissipation weight is reduced;

[0035] When the load changes suddenly, the auxiliary cooling fan is pre-started and switched to the balanced mode, dynamically adjusting the intercooler fan speed to stabilize the air-fuel ratio;

[0036] The self-recovery mechanism includes:

[0037] Abnormal location: Through cross-verification of sensor and infrared thermal imaging data, combined with OBD code analysis of the fault source;

[0038] Resource reorganization: Activate backup fans or emergency fluid storage tanks, and switch to low-power mode to reduce cooling requirements;

[0039] Energy efficiency rebalancing: Optimizes cooling parameters based on historical data, gradually adjusting fan start and stop thresholds and coolant flow.

[0040] The second technical solution of the present invention is to provide a multi-mode thermal management system for a diesel engine unit, comprising:

[0041] Data acquisition and thermal zone division module: This module uses embedded sensors to collect the temperature of key parts of the diesel engine in real time, combines infrared thermal imaging technology to monitor the heat distribution on the engine surface, and divides the diesel engine's thermal management area into core thermal zones and auxiliary thermal zones based on the intensity of the heat load.

[0042] Multi-mode control module: Based on the thermal partitioning and operating status of the diesel engine, it divides the thermal management modes into three categories: emergency mode, balanced mode, and low-consumption mode, and defines the trigger conditions;

[0043] Multi-mode adjustment module: Through dual-stage cooling enhancement, air-liquid cooling coupling control and waste heat recovery strategy, it drives differentiated cooling resource allocation and energy efficiency optimization in emergency mode, balanced mode, and low-consumption mode;

[0044] Dynamic adjustment module: Dynamically adjusts cooling priority and heat dissipation resource allocation to ensure thermal stability in scenarios such as delayed core area cooling and sudden load changes.

[0045] Self-recovery module: Through the three-stage self-recovery mechanism of abnormality location, resource reorganization, and energy efficiency rebalancing, it can achieve rapid system repair and energy efficiency optimization after diesel engine failure.

[0046] A third technical solution of the present invention is to provide a computer device, comprising: a processor and a memory, wherein the memory stores at least one instruction, at least one program, a code set or an instruction set, and the at least one instruction, the at least one program, the code set or the instruction set is loaded and executed by the processor to implement the multi-mode thermal management method for a diesel engine unit as described in one of the technical solutions.

[0047] The beneficial effects brought about by the technical solutions provided in the embodiments of the present application include at least the following beneficial effects:

[0048] This invention uses embedded sensors and infrared thermal imaging technology to monitor the temperature of key components in real time. Combined with heat load intensity assessment, it divides the diesel engine into core and auxiliary heat zones. This approach enables a refined division of the diesel engine's thermal management zones, enabling the implementation of differentiated cooling strategies for each zone, effectively improving the intelligence and energy efficiency of the thermal management system.

[0049] Based on the diesel engine's thermal zoning and operating status, three thermal management modes are defined: emergency mode, balanced mode, and low-consumption mode. These modes are dynamically switched based on trigger conditions. In abnormal situations, the system rapidly repairs and optimizes by locating the anomaly, reorganizing resources, and rebalancing energy efficiency. This multi-mode dynamic switching and three-stage self-recovery mechanism significantly enhances the system's adaptability and reliability, meeting operational requirements under complex operating conditions.

[0050] This approach not only accurately addresses the thermal management needs of diesel engines under different operating conditions, but also optimizes cooling resource allocation and energy efficiency through dual-stage cooling enhancement, air-liquid cooling coupling, and waste heat recovery strategies. Furthermore, a comprehensive fault recovery mechanism reduces maintenance costs and extends the service life of core components, providing strong technical support for the stable operation of diesel engines in various fields, including industry and transportation.

[0051] In summary, the technical solution of the present application effectively solves the problems of insufficient refinement of thermal management, single mode, delayed dynamic response and low fault repair efficiency in the existing technology, and provides a more efficient and reliable thermal management solution for diesel engine units. BRIEF DESCRIPTION OF THE DRAWINGS

[0052] Figure 1 The overall process diagram of the multi-mode thermal management method for diesel engine units is shown in FIG.

[0053] Figure 2 A detailed flow chart of the steps S100 of the multi-mode thermal management method for diesel engine units;

[0054] Figure 3 A detailed flow chart of step S200 of the multi-mode thermal management method for diesel engine units;

[0055] Figure 4 A detailed flow chart of the steps S300 of the multi-mode thermal management method for diesel engine units;

[0056] Figure 5 A detailed flow chart of the steps S400 of the multi-mode thermal management method for diesel engine units;

[0057] Figure 6 This is a detailed flow chart of the S500 steps of the multi-mode thermal management method for diesel engine units. DETAILED DESCRIPTION

[0058] The following will be combined with the accompanying drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of them. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of this application.

[0059] The shortcomings of traditional diesel engine thermal management systems include: fixed cooling strategies that are difficult to cope with dynamic operating conditions, lack of priority in thermal management resource allocation, insufficient adaptive recovery capabilities under abnormal operating conditions, and difficulty in reconciling the contradiction between energy efficiency optimization and heat dissipation requirements. To solve the above problems, please refer to Figure 1 , which shows a multi-mode thermal management method for a diesel engine set provided by an embodiment of the present invention, the method comprising:

[0060] S100: It uses embedded sensors to collect the temperature of key parts of the diesel engine in real time, combines infrared thermal imaging technology to monitor the heat distribution on the engine surface, and divides the diesel engine thermal management area into core thermal zone and auxiliary thermal zone according to the intensity of the heat load.

[0061] S200: Based on the thermal zoning and operating status of the diesel engine, three thermal management modes are divided into emergency mode, balanced mode, and low-consumption mode, and the trigger conditions are defined.

[0062] S300: Through dual-stage cooling enhancement, air-liquid cooling coupling control and waste heat recovery strategy, it drives differentiated cooling resource allocation and energy efficiency optimization in emergency mode, balanced mode and low-consumption mode.

[0063] S400: Dynamically adjusts cooling priority and heat dissipation resource allocation to ensure thermal stability in scenarios such as delayed core area cooling and sudden load changes.

[0064] S500: Through a three-stage self-recovery mechanism of abnormality location, resource reorganization, and energy efficiency rebalancing, it achieves rapid system repair and energy efficiency optimization after diesel engine failure.

[0065] S100-S500 uses embedded sensors and infrared thermal imaging to divide the diesel engine's core hot zone and auxiliary hot zone, defines three types of thermal management modes and trigger conditions: emergency, balanced, and low-consumption. It adopts strategies such as two-stage cooling enhancement to achieve differentiated cooling resource allocation and energy efficiency optimization in each mode. It dynamically adjusts the cooling priority for scenarios such as lagging core area cooling, and achieves post-fault system repair and energy efficiency optimization through a three-stage self-recovery mechanism.

[0066] The specific plan is as follows:

[0067] In its multi-mode thermal management approach for diesel engine units, the S100 uses embedded sensors and infrared thermal imaging technology to collect real-time temperature data from key engine components. Combined with heat load intensity analysis, it scientifically divides thermal management zones, providing data support for subsequent thermal management mode switching and cooling resource optimization.

[0068] Please refer to Figure 2 , which shows a flowchart of an exemplary multi-mode thermal management method S100 for a diesel engine set of the present application, including:

[0069] S110: By deploying embedded sensors, the temperature of key parts of the diesel engine is collected in real time.

[0070] The deployment of embedded sensors is the basis for achieving real-time temperature monitoring of key parts of diesel engines.

[0071] Embedded sensors are typically installed in key locations of diesel engines, including but not limited to the cylinder block, turbocharger, exhaust manifold, and oil pan, to ensure that temperature changes can be accurately captured.

[0072] S120: Use infrared thermal imaging technology to monitor the heat distribution on the surface of diesel engines.

[0073] Infrared thermal imaging is a non-contact temperature measurement method that provides comprehensive thermal distribution information without interfering with normal engine operation. By non-contactly monitoring the surface temperature distribution of diesel engines, infrared thermal imaging compensates for the limited spatial resolution of embedded sensors.

[0074] In one possible implementation, a high-resolution infrared camera with a resolution of 640×480 pixels or more is selected, with a thermal sensitivity of 0.05°C and a frame rate of no less than 30 Hz to capture transient temperature changes.

[0075] In one possible implementation, the infrared camera is fixed on the top or side of the diesel engine compartment, and the field of view covers the main area of the engine to avoid monitoring blind spots.

[0076] S130: Divide the heat load intensity assessment and heat management areas.

[0077] After collecting temperature data and monitoring surface heat distribution, the engine is divided into different thermal management zones based on heat load intensity. Heat load intensity is assessed based on engine operating parameters such as speed, load, and fuel consumption. A mathematical model is developed to quantify the heat load experienced by each component.

[0078] In a possible implementation, the mathematical model calculation method includes an energy balance method, a heat flow method, a finite element analysis method, a one-dimensional heat conduction analysis method, and a three-dimensional finite element analysis method.

[0079] For example, one-dimensional heat conduction analysis is suitable for linear components, simplifying the analysis by calculating steady-state heat flux. Three-dimensional finite element analysis is used for complex geometries, simulating transient temperature distributions and considering multi-physics coupling factors such as material thermal conductivity and convective heat transfer.

[0080] Specifically, the heat load index (HLI) is dynamically calculated using the following formula:

[0081]

[0082] Where HLI is the heat load index, α, β, and γ are weight coefficients calibrated by experiments, representing the contribution of steady-state temperature, temperature change rate, and load to heat load, respectively; T max It is the maximum value of the real-time temperature data obtained by embedded sensors or infrared thermal imaging technology; is the temperature change rate, obtained by time series difference of sensor data; P load is the diesel engine load parameter.

[0083] S140: Divide the diesel engine into a core heat zone and an auxiliary heat zone according to the evaluation result of the heat load intensity.

[0084] The division of core thermal zones and auxiliary thermal zones comprehensively considers the assessment results of heat load intensity, structural vulnerability and functional importance.

[0085] In one possible embodiment, the core hot zone is defined as an area where the sustained HLI exceeds 20 or the instantaneous peak reaches 25 or more, and also includes key components that are sensitive to thermal deformation and functional areas that directly affect power output.

[0086] The auxiliary thermal zone is defined as an area with an HLI between 8 and 20 and less thermal load fluctuation, as well as components with cooling redundancy.

[0087] The division process is divided into three steps:

[0088] Generate a heat load distribution map based on the heat load index (HLI) and mark areas with high HLI values;

[0089] Combined with the 3D model of the diesel engine unit, high stress concentration areas are identified;

[0090] Engineers conduct manual review and adjust partition boundaries based on experience.

[0091] For example, the simulation results of the cylinder head show stress concentration in the edge area, but in actual operation, the coolant flows evenly and it may be classified as an auxiliary hot zone.

[0092] In its multi-mode thermal management approach for diesel engine units, the S200 identifies three primary thermal management modes through a comprehensive analysis of thermal zoning and operating conditions. These modes also define corresponding trigger conditions, providing foundational support for subsequent cooling resource allocation and energy efficiency optimization. By building a flexible and intelligent thermal management strategy, the system ensures efficient operation of diesel engines under varying operating conditions while preventing failures or performance degradation caused by temperature anomalies.

[0093] Please refer to Figure 3 , which shows a flowchart of an exemplary multi-mode thermal management method S200 for a diesel engine set of the present application, including:

[0094] S210: Define the triggering conditions and response mechanism of the emergency mode.

[0095] Emergency mode is a dynamic response mechanism within the diesel engine's thermal management system to handle extreme operating conditions. It activates when the engine's core hot zone temperature exceeds the material tolerance threshold or a cooling system failure occurs. In this mode, the system prioritizes all available cooling resources to minimize the core hot zone temperature while limiting engine output to reduce heat generation.

[0096] In one possible implementation, the triggering conditions for the emergency mode include:

[0097] The temperature of the core hot zone is monitored in real time through embedded sensors. When it is detected that the temperature of the core hot zone exceeds the material tolerance threshold, it switches to emergency mode.

[0098] If the main cooling fan, coolant pump or other cooling system fails and normal operation cannot be restored through backup resources, the emergency mode is triggered.

[0099] In one possible implementation, in emergency mode, measures to ensure a rapid drop in the core thermal zone temperature include:

[0100] Activate dual-stage cooling enhancement, which increases the coolant circulation rate and activates the turbocharger's independent water cooling circuit to improve the coolant pump's efficiency and ensure effective cooling of high-temperature areas.

[0101] Turn off non-critical cooling devices, stop cooling operations in auxiliary hot zones, and concentrate resources on core hot zones.

[0102] The driver is alerted to abnormal conditions through sound and light alarms, while the electronic control unit limits engine speed and load to reduce heat generation.

[0103] S220: Define the triggering conditions and dynamic control strategy of the balancing mode.

[0104] Balanced mode is a management strategy that optimizes the overall thermal distribution of a diesel engine. It is suitable for operating under steady-state load conditions with minimal temperature differences between different zones. The core goal of Balanced mode is to achieve uniform temperature distribution across the engine's thermal management zones by dynamically adjusting the coordination between the air and liquid cooling systems. In this mode, the system adjusts the cooling resource allocation ratio in real time based on the actual operating status of the diesel engine to achieve optimal energy efficiency.

[0105] In one possible implementation, the triggering conditions for the balancing mode include:

[0106] When the speed and load of the diesel engine remain relatively stable, that is, the diesel engine is in a steady-state load, and the change amplitude is less than the set threshold, it enters the balance mode.

[0107] Temperature data obtained through embedded sensors and infrared thermal imaging technology show that when the temperature difference between the thermal management areas of the diesel engine is less than 10°C, it is determined that the current operating conditions are suitable for starting the balancing mode.

[0108] In a possible implementation, in the balanced mode, the cooling resource configuration optimization strategy adopted includes:

[0109] A dynamic air-cooling-liquid-cooling coupling control strategy is adopted to coordinate the operating speeds of the main cooling fan and the coolant pump according to the diesel engine load ratio to ensure that the coolant flow rate matches the actual demand.

[0110] By monitoring intake air temperature fluctuations, the intercooler fan speed and operating time are dynamically adjusted to maintain intake air temperature stability.

[0111] Optimize the coolant distribution path and adjust the thermostat opening in real time to ensure that the coolant flows to areas with higher temperatures first, thereby improving cooling efficiency.

[0112] S230: Define the triggering conditions and energy-saving strategy of the low-power mode.

[0113] Low-consumption mode is a management strategy for energy conservation and consumption reduction, primarily used when the diesel engine is shut down or under low load. When the diesel engine is under low load or shut down, Low-consumption mode shuts down unnecessary cooling equipment, maintaining only basic cooling functions, significantly reducing active cooling energy consumption. Furthermore, this mode utilizes waste heat recovery devices to convert waste heat into useful energy, further improving system energy efficiency.

[0114] In a possible implementation, the triggering conditions for the low-power mode include:

[0115] When the diesel engine is stopped, the system automatically switches to low-consumption mode, retaining only the necessary coolant circulation to prevent local overheating.

[0116] When the diesel engine load is lower than the set threshold and the temperature of each thermal management area is lower than the warning value, the system determines that the current operating conditions are suitable for starting the low-consumption mode.

[0117] In one possible implementation, in the low-consumption mode, measures taken to reduce energy consumption and optimize resource utilization include:

[0118] Stop the operation of high-energy-consuming equipment such as the main cooling fan and the turbocharger independent water cooling system, shut down non-essential cooling equipment, and maintain only basic coolant circulation.

[0119] The waste heat in the coolant is converted into electricity or other forms of energy through a thermoelectric conversion module or heat exchanger for use by other systems.

[0120] Adjust the coolant circulation rate and distribution path to ensure that energy consumption is minimized while meeting heat dissipation requirements.

[0121] S240: Switching and transition between emergency mode, balanced mode and low-consumption mode.

[0122] The diesel engine thermal management system's mode switching logic is based on real-time collected temperature data, load information, and other operating parameters. In one possible implementation, the switching logic for the currently enabled thermal management mode includes:

[0123] When the temperature of the core hot zone approaches or exceeds the material tolerance threshold, it is prioritized to switch to emergency mode.

[0124] If the diesel engine is in steady-state load and the temperature difference between the zones is less than 10°C, it switches to the balanced mode.

[0125] In shutdown or low-load state, the system automatically enters low-power mode.

[0126] To avoid thermal shock or performance fluctuations that may occur during mode switching, the transition strategies adopted include:

[0127] By analyzing temperature change trends, we can predict possible over-temperature risks and adjust cooling resource configuration in advance before the trigger conditions are reached.

[0128] When switching to a new mode, gradually change parameters such as coolant flow and fan speed to avoid thermal stress concentration caused by sudden changes.

[0129] In the S300's multi-mode thermal management approach for diesel engine units, the emergency mode effectively responds to extreme operating conditions through measures such as dual-stage cooling enhancement, shutdown of non-critical cooling equipment, alarm triggering, and power limiting. The balanced mode optimizes the diesel engine's overall thermal distribution through strategies such as dynamic air-liquid cooling coupling control, intermittent operation of the intercooler fan, and coolant distribution path optimization. The low-consumption mode significantly reduces active cooling energy consumption by maintaining basic coolant circulation, shutting down high-energy-consuming equipment, and activating waste heat recovery devices. This not only enhances the diesel engine's thermal management effectiveness, but also further optimizes the system's overall energy efficiency.

[0130] Please refer to Figure 4 , which shows a flowchart of an exemplary multi-mode thermal management method S300 for a diesel engine set of the present application, including:

[0131] S310: Cooling resource allocation and priority adjustment in emergency mode.

[0132] Emergency mode is a key mechanism in the diesel engine thermal management system for coping with extreme operating conditions. It minimizes the temperature of the core hot zone and limits the engine output power to reduce heat generation when the temperature of the core hot zone exceeds the material tolerance threshold or the cooling system fails.

[0133] The differentiated cooling resource allocation and energy efficiency optimization in emergency mode are as follows: starting two-stage cooling enhancement, prioritizing the increase of coolant circulation rate, synchronously activating the independent water cooling circuit of the turbocharger, shutting down non-critical cooling equipment, triggering an alarm and limiting engine output power.

[0134] Specifically, dual-stage cooling enhancement is the primary measure in emergency mode. It aims to quickly reduce core hot zone temperatures by increasing coolant circulation and activating the turbocharger's independent water cooling circuit. Specifically, the coolant pump's efficiency will be significantly improved, ensuring effective cooling of high-temperature areas.

[0135] In one possible implementation, the coolant pump speed is dynamically adjusted based on real-time temperature data from the core hot zone. The optimal coolant flow rate is calculated using temperature information obtained by embedded sensors and surface heat distribution monitored using infrared thermal imaging technology.

[0136] Specifically, activation of the independent water cooling circuit of the turbocharger can effectively alleviate the overheating problem of the turbocharger and avoid performance degradation or damage caused by high temperature.

[0137] In one possible embodiment, the activation condition of the independent water cooling circuit of the turbocharger is based on the temperature threshold of the turbocharger. Once the temperature is detected to exceed a set safety range, the independent water cooling circuit is immediately activated to ensure that the temperature of the turbocharger drops rapidly.

[0138] Specifically, to concentrate cooling resources on the core hot zone, all non-critical cooling equipment will be shut down in emergency mode, including but not limited to cooling fans in auxiliary hot zones and some coolant circulation paths.

[0139] In one possible implementation, an electronic control unit (ECU) monitors and manages the overall operating status of the cooling system, and identifies and shuts down all unnecessary heat dissipation devices.

[0140] Specifically, in emergency mode, the system will alert the driver to abnormal conditions through sound and light alarms, and limit engine speed and load through the electronic control unit to reduce heat generation.

[0141] In one possible embodiment, the triggering conditions of the sound and light alarm system are based on the temperature threshold of the core hot zone and the fault status of the cooling system. Once over-temperature or cooling system failure is detected, the alarm mechanism is immediately activated.

[0142] S320: Cooling resource configuration and dynamic control in balanced mode.

[0143] Balanced mode is a management strategy that optimizes the overall heat distribution of the diesel engine. It is suitable for operating the engine at steady load with minimal temperature differences between different zones. In this mode, the system adjusts the cooling resource allocation ratio in real time based on the actual operating status of the diesel engine to achieve the best energy efficiency ratio.

[0144] Balanced mode optimizes cooling resource allocation and energy efficiency by employing dynamic air-liquid coupled control. This involves coordinated speed adjustments of the main cooling fan and coolant pump based on load, while the intercooler fan operates intermittently to balance intake air temperature. The thermostat opening is adjusted in real time to optimize the coolant distribution path.

[0145] Specifically, dynamic air cooling-liquid cooling coupling control is achieved by coordinating the operating speed of the main cooling fan and the coolant pump to ensure that the coolant flow rate matches actual demand.

[0146] In one possible implementation, the speed of the main cooling fan and coolant pump is dynamically adjusted based on the load ratio of the diesel engine. Real-time temperature data obtained by embedded sensors is used to calculate the optimal fan speed and coolant flow rate.

[0147] Specifically, intermittent operation of the intercooler fan is another important measure in the balanced mode, which maintains the stability of the intake air temperature by dynamically adjusting the speed and operating time of the intercooler fan.

[0148] In one possible implementation, the intercooler fan's operating cycle is dynamically adjusted based on changes in intake air temperature. By monitoring intake air temperature fluctuations, the optimal fan speed and operating time are calculated.

[0149] Specifically, the optimization of the coolant distribution path is achieved by adjusting the thermostat opening in real time to ensure that the coolant flows preferentially to areas with higher temperatures, thereby improving cooling efficiency.

[0150] In one possible implementation, the thermostat opening is dynamically adjusted based on the temperature distribution of each thermal management area of the diesel engine. The optimal thermostat opening is calculated using surface heat distribution information acquired through infrared thermal imaging technology.

[0151] S330: Cooling resource conservation and waste heat recovery in low-consumption mode.

[0152] Low Consumption Mode is a management strategy for energy conservation and consumption reduction, primarily used when the diesel engine is shut down or under low load. In this mode, the system significantly reduces active cooling energy consumption by shutting down unnecessary cooling equipment and activating waste heat recovery, while also improving overall system efficiency.

[0153] The differentiated cooling resource allocation and energy efficiency optimization in low-consumption mode are as follows: only basic coolant circulation is maintained, the turbocharger independent water cooling system is shut down; the waste heat recovery device is activated to reduce active heat dissipation energy consumption.

[0154] Specifically, in low-consumption mode, only necessary coolant circulation is maintained to prevent local overheating.

[0155] In one possible implementation, the coolant circulation rate is dynamically adjusted based on the temperature distribution of the diesel engine. The optimal coolant circulation rate is calculated using real-time temperature data acquired by embedded sensors.

[0156] Specifically, in low-consumption mode, all high-energy-consuming equipment will be turned off, including the main cooling fan, turbocharger independent water cooling system, etc.

[0157] In one possible implementation, the shutdown conditions for high-energy-consuming devices are based on the temperature distribution and load status of the diesel engine. Once it is detected that both the temperature and the load are below a set threshold, the relevant devices are immediately shut down.

[0158] Specifically, the activation of the waste heat recovery device is another important measure in low-consumption mode, which converts waste heat in the coolant into electricity or other forms of energy for use by other systems.

[0159] In one possible implementation, the operating parameters of the waste heat recovery device are dynamically adjusted based on the temperature distribution of the diesel engine. The waste heat in the coolant is converted into electricity or other forms of energy through a thermoelectric conversion module or heat exchanger.

[0160] In the multi-mode thermal management method for diesel engine units, S400 provides effective technical measures for special operating conditions such as delayed cooling of the core hot zone, abnormal turbocharger temperature, and sudden load changes.

[0161] Please refer to Figure 5 , which shows a flowchart of an exemplary multi-mode thermal management method S400 for a diesel engine set of the present application, including:

[0162] S410: Handling of delayed cooling of the core hot zone and abnormal turbocharger temperature.

[0163] If the core hot zone lags behind in cooling, the coolant pump priority is increased, the electric auxiliary pump output is increased, and the intercooler heat dissipation weight is reduced;

[0164] In one possible implementation, the coolant pump's operating priority is increased in high-temperature areas, significantly increasing the coolant flow rate and accelerating the temperature drop. Specific implementations include, but are not limited to, increasing the coolant pump's speed or changing its operating mode to accommodate different operating conditions.

[0165] In one possible implementation, the electric auxiliary pump is started when the core hot zone temperature exceeds a certain critical value, and the electric auxiliary pump will operate at maximum power; and as the temperature gradually drops to a safe range, the power of the auxiliary pump will also be reduced accordingly until it is completely shut down.

[0166] In one possible implementation, reducing the intercooler heat dissipation weight involves dynamically adjusting the intercooler fan's operating parameters based on changes in intake air temperature. For example, when intake air temperature fluctuations are minimal and within a normal range, the intercooler fan's operating time can be significantly reduced. Conversely, if intake air temperature fluctuates significantly, the fan speed is only moderately reduced to maintain a stable air-fuel mixture ratio.

[0167] S420: Instant response and mode switching when load changes suddenly.

[0168] If the load changes suddenly, it will immediately switch to balanced mode and pre-start the auxiliary cooling fan; at the same time, it will monitor the intake temperature fluctuations and dynamically adjust the intercooler fan speed to stabilize the air-fuel ratio.

[0169] In one possible implementation, when a sudden load change is confirmed, the system's response to maintaining thermal balance includes:

[0170] Pre-start the auxiliary cooling fan. Specifically, at the beginning of a sudden load change, even if the temperature has not risen significantly, the auxiliary cooling fan will start in advance to prevent potential overheating risks.

[0171] Dynamically adjust the main cooling fan and coolant pump. Specifically, according to the load ratio of the diesel engine, coordinate the operating speed of the main cooling fan and coolant pump to ensure that the coolant flow rate matches the actual demand.

[0172] In one possible implementation, if a sudden load change causes the existing thermal management mode to fail, the system will immediately switch to balanced mode. During this process, the system pre-starts the auxiliary cooling fan to fully prepare for the potential temperature increase. Simultaneously, it closely monitors intake air temperature fluctuations and dynamically adjusts the intercooler fan speed to ensure the air-fuel ratio remains optimal.

[0173] In the multi-mode thermal management method for diesel engine units, due to complex operating conditions and long-term use, S500, as a link in the multi-mode thermal management method for diesel engine units, aims to achieve rapid system repair and energy efficiency optimization through three stages: abnormality location, resource reorganization and energy efficiency rebalancing.

[0174] Please refer to Figure 6 , which shows a flowchart of an exemplary multi-mode thermal management method S500 for a diesel engine set of the present application, and its contents include:

[0175] S510: Abnormal location.

[0176] The first step in anomaly location is to cross-validate data collected by embedded sensors and infrared thermal imaging technology to identify potential fault sources.

[0177] In a possible implementation, the specific implementation includes:

[0178] The data collection frequency must be consistent with S110 to ensure real-time performance.

[0179] Kalman filtering or machine learning algorithms are used to process cross-validation results to improve diagnostic accuracy.

[0180] For example, when the temperature of the embedded sensor in a certain cylinder area exceeds 250° C., infrared thermal imaging confirms that a high temperature distribution does exist in the area, and it is determined to be an actual thermal fault.

[0181] The second step is to quickly locate electronic control unit (ECU) related anomalies by analyzing OBD diagnostic codes. Modern diesel engines are generally equipped with on-board diagnostic systems (OBD) that can record and generate diagnostic codes.

[0182] In a possible implementation, the specific implementation includes:

[0183] Develop dedicated algorithms to parse OBD codes and perform correlation analysis with sensor data.

[0184] When the OBD code shows P0480, combine the actual operating status of the main cooling fan to determine whether it is a hardware failure or electrical connection problem.

[0185] S520: Resource reorganization.

[0186] First, when the main cooling fan fails, the system needs to quickly switch to the backup fan to maintain normal cooling function.

[0187] In a possible implementation, the specific implementation includes:

[0188] When the speed of the main cooling fan falls below 80% of the rated value, the switching logic is triggered.

[0189] After the standby fan is started, its speed is dynamically adjusted according to the diesel engine load ratio. For example, when the load is 50%, the standby fan speed is set to 70% of the rated value.

[0190] Specific measures to limit engine speed include reducing the injection amount and limiting the turbo boost pressure through the electronic control unit (ECU).

[0191] Secondly, coolant leakage is one of the common faults in diesel engine thermal management systems. To cope with this situation, the system needs to have an emergency reservoir to replenish coolant and adopt a low-consumption mode to reduce heat dissipation requirements.

[0192] In a possible implementation, the specific implementation includes:

[0193] When the coolant level drops at a rate exceeding 0.5L / min, it is determined to be a serious leak and the emergency storage tank is activated immediately.

[0194] The capacity of the emergency fluid storage tank should be sufficient to support the diesel engine to operate in low-consumption mode for at least 30 minutes.

[0195] Specific operations in the low-consumption mode refer to S230, including stopping the operation of high-energy-consuming devices such as the main cooling fan and the turbocharger independent water cooling system.

[0196] S530: Energy efficiency rebalancing.

[0197] First, after completing resource reorganization, select the appropriate thermal management mode based on the actual status after repair.

[0198] In a possible implementation, the specific implementation includes:

[0199] When all faulty components return to normal and the core thermal zone temperature is below 200°C, the system switches to balanced mode.

[0200] If the diesel engine is still in shutdown or low load state, it switches to low consumption mode.

[0201] During the transition process, gradually adjust parameters such as coolant flow and fan speed to ensure smooth switching.

[0202] Secondly, in order to further improve the energy efficiency of the system, key parameters are optimized based on historical data.

[0203] In a possible implementation, the specific implementation includes:

[0204] Use big data analysis tools to mine the operating data of the past year and extract the optimal parameter settings under typical operating conditions.

[0205] A theoretical model is constructed based on finite element analysis or one-dimensional heat conduction analysis to predict the heat dissipation effect under different combinations of coolant flow rate and fan speed.

[0206] Automatically adjust the fan start and stop thresholds and coolant flow parameters to achieve dynamic optimization.

[0207] Finally, the fan start / stop thresholds and coolant flow parameters directly affect the system's energy efficiency, so they need to be dynamically optimized.

[0208] In a possible implementation, the specific implementation includes:

[0209] When the diesel engine load is less than 30%, the fan start / stop threshold is set to 80°C; when the load is higher than 70%, the threshold is reduced to 70°C.

[0210] The optimization of the coolant flow distribution path refers to the real-time thermostat opening adjustment strategy in S320, combined with the surface heat distribution information obtained by infrared thermal imaging technology to calculate the optimal thermostat opening.

[0211] In summary, a multi-mode thermal management method for diesel engine units uses embedded sensors to collect the real-time temperature of key components, infrared thermal imaging technology to monitor surface heat distribution, and combined with thermal load intensity assessment to divide the diesel engine into core and auxiliary thermal zones. Based on this division, three thermal management modes are defined: emergency mode, balanced mode, and low-consumption mode. Cooling resource allocation is dynamically adjusted for different operating states. In abnormal situations, the system can be quickly repaired and optimized through anomaly location, resource reorganization, and energy efficiency rebalancing. This method effectively improves the intelligence level, reliability, and energy efficiency of the diesel engine thermal management system and is suitable for the operation requirements of diesel engines under complex operating conditions.

[0212] This application also provides a multi-mode thermal management system for diesel engine units, including:

[0213] Data acquisition and thermal zone division module: This module uses embedded sensors to collect the temperature of key parts of the diesel engine in real time, combines infrared thermal imaging technology to monitor the heat distribution on the engine surface, and divides the diesel engine's thermal management area into core thermal zones and auxiliary thermal zones based on the intensity of the heat load.

[0214] Multi-mode control module: Based on the thermal partitioning and operating status of the diesel engine, it divides the thermal management modes into three categories: emergency mode, balanced mode, and low-consumption mode, and defines the trigger conditions;

[0215] Multi-mode adjustment module: Through dual-stage cooling enhancement, air-liquid cooling coupling control and waste heat recovery strategy, it drives differentiated cooling resource allocation and energy efficiency optimization in emergency mode, balanced mode, and low-consumption mode;

[0216] Dynamic adjustment module: Dynamically adjusts cooling priority and heat dissipation resource allocation to ensure thermal stability in scenarios such as delayed core area cooling and sudden load changes.

[0217] Self-recovery module: Through the three-stage self-recovery mechanism of abnormality location, resource reorganization, and energy efficiency rebalancing, it can achieve rapid system repair and energy efficiency optimization after diesel engine failure.

[0218] The present application also provides a computer device, which includes: a processor and a memory, wherein the memory stores at least one instruction, at least one program, a code set or an instruction set, and the at least one instruction, the at least one program, the code set or the instruction set is loaded and executed by the processor to implement a multi-mode thermal management method for a diesel engine unit.

[0219] The basic principles of the present application have been described above in conjunction with specific embodiments. However, it should be noted that the advantages, strengths, and effects mentioned in this application are merely illustrative and not restrictive, and it should not be assumed that these advantages, strengths, and effects are required of each embodiment of this application. In addition, the specific details disclosed above are merely illustrative and facilitating understanding, and are not restrictive. The above details do not limit this application to necessarily being implemented using the above specific details.

[0220] The block diagrams of the devices, devices, equipment, and systems involved in this application are merely illustrative examples and are not intended to require or imply that they must be connected, arranged, or configured in the manner shown in the block diagrams. As will be appreciated by those skilled in the art, these devices, devices, equipment, and systems can be connected, arranged, or configured in any manner. Words such as "include," "comprise," "have," and the like are open-ended words, meaning "including but not limited to," and can be used interchangeably therewith. The words "or" and "and" used herein refer to the words "and / or" and can be used interchangeably therewith, unless the context clearly indicates otherwise. The word "such as" used herein refers to the phrase "such as but not limited to," and can be used interchangeably therewith.

[0221] It should also be noted that in the apparatus, device, and method of the present application, each component or each step can be decomposed and / or recombined, and such decomposition and / or recombination should be regarded as equivalent solutions of the present application.

[0222] The above description of the disclosed aspects is provided to enable any person skilled in the art to make or use the present application. Various modifications to these aspects will be readily apparent to those skilled in the art, and the general principles defined herein may be applied to other aspects without departing from the scope of the present application. Therefore, the present application is not intended to be limited to the aspects shown herein, but rather to be applied in the widest sense consistent with the principles and novel features of the present invention.

[0223] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent replacements, etc. made within the spirit and principles of the present application shall be included in the scope of protection of the present application.

Claims

1. A multi-mode thermal management method for a diesel engine set, characterized in that: include: Embedded sensors collect the temperature of key parts of the diesel engine in real time, and infrared thermal imaging technology is used to monitor the heat distribution on the engine surface. The thermal management area of the diesel engine is divided into core thermal zones and auxiliary thermal zones according to the intensity of the heat load. Based on the thermal zoning and operating status of the diesel engine, three thermal management modes are divided into emergency mode, balanced mode, and low-consumption mode, and the trigger conditions are defined; Through dual-stage cooling enhancement, air-liquid cooling coupling control and waste heat recovery strategy, differentiated cooling resource allocation and energy efficiency optimization are driven in emergency mode, balanced mode and low-consumption mode; Dynamically adjust cooling priorities and heat dissipation resource allocation to ensure thermal stability in scenarios such as delayed cooling in the core area and sudden load changes. Through the three-stage self-recovery mechanism of abnormality positioning, resource reorganization, and energy efficiency rebalancing, the system can be quickly repaired and energy efficiency optimized after diesel engine failure.

2. The multi-mode thermal management method for a diesel engine set according to claim 1, characterized in that: The embedded sensors are deployed on the diesel engine's cylinder block, turbocharger, exhaust manifold and oil pan to collect temperature data in real time and transmit it synchronously to the electronic control unit; The infrared thermal imaging technology uses an infrared camera with a resolution of ≥640×480 pixels and a thermal sensitivity of ≤0.05°C to monitor the surface heat distribution of the diesel engine at a frame rate of ≥30 Hz, and calibrates the field of view to cover the main area of the engine through a three-dimensional model.

3. The multi-mode thermal management method for a diesel engine set according to claim 1, characterized in that: The heat load intensity assessment is dynamically calculated through the heat load index, and the formula is: Where HLI is the heat load index, α, β, and γ are weight coefficients, representing the contribution of steady-state temperature, temperature change rate, and load to heat load, respectively; T max It is the maximum value of the real-time temperature data obtained by embedded sensors or infrared thermal imaging technology; is the temperature change rate, obtained by time series difference of sensor data; P load is the diesel engine load parameter; The core hot zone is defined as an area with a continuous HLI ≥ 20 or an instantaneous HLI peak ≥ 25, and includes thermal deformation-sensitive components and key power output areas. The auxiliary hot zone is defined as an area with an HLI of 8 to 20 and heat dissipation redundancy. The division is based on a three-dimensional stress model and manual boundary review and correction.

4. The multi-mode thermal management method for a diesel engine set according to claim 1, characterized in that: The triggering conditions and measures of the emergency mode include: Trigger conditions: The core hot zone temperature exceeds the material tolerance threshold, or the main cooling system fails and the backup resource reorganization fails; Response measures: Initiate dual-stage cooling enhancement to increase coolant circulation rate, activate the turbocharger's independent water cooling circuit, shut down non-critical cooling equipment, and limit engine power output through the ECU; In the two-stage cooling enhancement, the turbocharger's independent water cooling circuit is activated when the temperature exceeds a safety threshold, and the coolant pump speed is dynamically adjusted according to the real-time temperature of the core hot zone.

5. The multi-mode thermal management method for a diesel engine set according to claim 1, characterized in that: The triggering conditions and control strategies of the equilibrium mode include: Trigger conditions: The diesel engine is in steady-state load and the regional temperature difference is less than 10°C; Control strategy: Dynamically coordinate the main cooling fan and coolant pump speed to match the load ratio, intermittently run the intercooler fan based on intake temperature fluctuations, and adjust the thermostat opening in real time to optimize the coolant distribution path.

6. The multi-mode thermal management method for a diesel engine set according to claim 1, characterized in that: The triggering conditions and energy-saving measures of the low-consumption mode include: Trigger conditions: diesel engine shutdown or load below 30%; Energy-saving measures: Turn off the main cooling fan and the independent water cooling system of the turbocharger, start the thermoelectric conversion module to convert waste heat into electricity, and dynamically adjust the coolant circulation rate to the minimum demand threshold.

7. The multi-mode thermal management method for a diesel engine set according to claim 1, characterized in that: The dynamically adjusting cooling priority includes: When the core hot zone lags behind in cooling, the coolant pump speed is increased and the electric auxiliary pump is started, while the intercooler heat dissipation weight is reduced; When the load changes suddenly, the auxiliary cooling fan is pre-started and switched to the balanced mode, dynamically adjusting the intercooler fan speed to stabilize the air-fuel ratio; The self-recovery mechanism includes: Abnormal location: Through cross-verification of sensor and infrared thermal imaging data, combined with OBD code analysis of the fault source; Resource reorganization: Activate backup fans or emergency fluid storage tanks, and switch to low-power mode to reduce cooling requirements; Energy efficiency rebalancing: Optimizes cooling parameters based on historical data, gradually adjusting fan start and stop thresholds and coolant flow.

8. A multi-mode thermal management system for diesel engine units, characterized in that: include: Data acquisition and thermal zone division module: This module uses embedded sensors to collect the temperature of key parts of the diesel engine in real time, combines infrared thermal imaging technology to monitor the heat distribution on the engine surface, and divides the diesel engine's thermal management area into core thermal zones and auxiliary thermal zones based on the intensity of the heat load. Multi-mode control module: Based on the thermal partitioning and operating status of the diesel engine, it divides the thermal management modes into three categories: emergency mode, balanced mode, and low-consumption mode, and defines the trigger conditions; Multi-mode adjustment module: Through dual-stage cooling enhancement, air-liquid cooling coupling control and waste heat recovery strategy, it drives differentiated cooling resource allocation and energy efficiency optimization in emergency mode, balanced mode, and low-consumption mode; Dynamic adjustment module: Dynamically adjusts cooling priority and heat dissipation resource allocation to ensure thermal stability in scenarios such as delayed core area cooling and sudden load changes. Self-recovery module: Through the three-stage self-recovery mechanism of abnormality location, resource reorganization, and energy efficiency rebalancing, it can achieve rapid system repair and energy efficiency optimization after diesel engine failure.

9. A computer device, characterized in that: The computer device includes: a processor and a memory, wherein the memory stores at least one instruction, at least one program, a code set, or an instruction set, and the at least one instruction, the at least one program, the code set, or the instruction set is loaded and executed by the processor to implement the multi-mode thermal management method for a diesel engine set as described in any one of claims 1 to 7.

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