An engine protection method, device, apparatus and automobile

Abstract

The application provides an engine protection method, device, equipment and automobile. When the engine starts and enters a warm-up working condition, it is judged whether a water temperature sensor is abnormal. If the water temperature sensor is abnormal, it indicates that the main water temperature detected by the water temperature sensor is not the real main water temperature. At this time, since the engine cannot be accurately judged whether it is overheated, when the abnormality of the water temperature sensor is detected, the cooling circuit can be directly controlled by the heat management and control module to enter a large circulation full-open state, so that the coolant can effectively cool the engine in time, and the engine temperature is within a normal range. It can be seen that, compared with the prior art, the cooling circuit of the engine can be controlled to enter a large circulation full-open state when the water temperature sensor is abnormal, so that the engine can be cooled in time and effectively, and engine damage caused by the real temperature of the engine being too high is prevented.

Description

Technical Field

[0001] This invention relates to the field of automotive engine technology, specifically to an engine protection method, device, equipment, and automobile. Background Technology

[0002] In some models, the engine is equipped with a thermal management module and has only one cylinder block / cylinder head coolant temperature sensor. This coolant temperature sensor is usually located on the engine block and can be used as the engine's main coolant temperature sensor to detect the engine's main coolant temperature, which is also the engine's average temperature.

[0003] A car engine cooling system has two circulation modes: a small circulation mode and a large circulation mode. The small circulation mode involves the coolant circulating only within the engine's internal water channels, while the large circulation mode involves the coolant passing through the radiator (water tank) external to the engine. The switching between these two circulation modes is controlled by a thermostat. When the thermostat is closed, the small circulation mode is activated; conversely, the large circulation mode is activated.

[0004] During the warm-up process, the coolant in the car's water pump flows through the cooling pipes from the cylinder block to the cylinder head, then from the cylinder head to the aforementioned water temperature sensor. After passing through the cooling pipes and the thermostat, it enters the main circulation of the car's engine cooling system. After the main circulation, it enters the radiator and then flows through the second water temperature sensor. This second water temperature sensor is used to detect the water temperature at the radiator end, and the water temperature in this part can also be referred to as the second water temperature.

[0005] If the coolant temperature sensor signal is abnormal during engine warm-up, the sensor will be unable to report a fault code, resulting in a lower reported coolant temperature during warm-up. This can cause the thermal management module (TMM) to fail to open, leading to engine overheating and damage. Therefore, preventing engine overheating and damage due to coolant temperature sensor malfunction during engine warm-up is one of the technical problems that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0006] In view of this, embodiments of the present invention provide an engine protection method, device, equipment, and automobile to ensure that the engine is not damaged due to excessive temperature during the warm-up process of the automobile when the water temperature sensor is abnormal.

[0007] To achieve the above objectives, the embodiments of the present invention provide the following technical solutions:

[0008] An engine protection method, comprising:

[0009] When the engine is in warm-up mode, the actual temperature detected by the water temperature sensor and the theoretical temperature of the water temperature sensor are obtained.

[0010] Based on the comparison between the actual temperature and the theoretical temperature, it is determined whether the water temperature sensor is abnormal. The water temperature sensor is used to detect the main engine water temperature.

[0011] When the water temperature sensor malfunctions, the heat management and control module controls the engine cooling circuit to enter a fully open state of large circulation.

[0012] Optionally, in the above engine protection method, obtaining the actual temperature detected by the water temperature sensor and the theoretical temperature of the water temperature sensor; and determining whether the water temperature sensor is abnormal based on the comparison result of the actual temperature and the theoretical temperature, including:

[0013] The timer starts when the machine enters the warm-up phase.

[0014] The actual output temperature of the water temperature sensor, the ambient temperature of the car, and the heating setting of the air conditioner are obtained.

[0015] Obtain the theoretical output temperature of the water temperature sensor that matches the timing results, the ambient temperature of the car, and the heating setting of the air conditioner;

[0016] Based on the comparison between the actual output temperature and the theoretical output temperature, it is determined whether the water temperature sensor is malfunctioning.

[0017] Optionally, in the above engine protection method, determining whether the water temperature sensor is abnormal based on the comparison result between the actual output temperature and the theoretical output temperature includes:

[0018] Determine whether the difference between the actual output temperature and the theoretical output temperature is greater than a preset value. If the difference between the actual output temperature and the theoretical output temperature is greater than the preset value, determine that the water temperature sensor is abnormal.

[0019] Optionally, in the above engine protection method, before controlling the engine cooling circuit to enter the fully open state through the thermal management and control module after determining that the water temperature sensor is abnormal, it also includes:

[0020] Determine whether the timing duration has reached the target duration, which is the time when the theoretical output temperature of the temperature sensor reaches the closed-loop water temperature, determined based on the ambient temperature of the vehicle and the heating setting of the air conditioner.

[0021] When the timing duration reaches the target duration, determine whether the actual output temperature is less than the closed-loop water temperature of the heat management and control module;

[0022] If the actual output temperature is lower than the closed-loop water temperature, continue execution.

[0023] Optionally, in the above engine protection method, after controlling the engine cooling circuit to enter the fully open large circulation state through the thermal management and control module, it further includes:

[0024] Obtain the engine coolant temperature via two channels;

[0025] Determine whether the output temperature of the water temperature sensor is greater than the engine's dual-channel water temperature;

[0026] When the output temperature of the water temperature sensor is greater than the engine's dual water temperature, the heat management and control module is controlled to enter the normal control logic.

[0027] When the output temperature of the water temperature sensor is lower than the engine's dual-circuit water temperature, the engine cooling circuit is controlled to remain in the fully open state of the large circulation loop, while the routine diagnostics of the heat management and control module are suppressed.

[0028] Optionally, in the above engine protection method, before controlling the engine cooling circuit to enter the fully open state through the thermal management and control module after determining that the water temperature sensor is abnormal, it also includes:

[0029] Perform fault diagnosis on the water temperature sensor;

[0030] When the water temperature sensor malfunctions, a prompt message is generated and output to characterize the malfunction.

[0031] The control module controls the engine cooling circuit to enter and maintain the large circulation fully open state.

[0032] Optionally, in the above engine protection method, fault diagnosis of the water temperature sensor includes:

[0033] Perform circuit fault diagnosis on the water temperature sensor;

[0034] Perform a low-pressure side power-on diagnostic on the water temperature sensor.

[0035] An engine protection device includes: a coolant temperature sensor anomaly detection unit and a thermal management control module control unit;

[0036] The water temperature sensor anomaly detection unit is used to determine whether the water temperature sensor is abnormal when the engine is in warm-up mode by comparing the temperature detected by the water temperature sensor at the same moment with the theoretical output temperature of the water temperature sensor at the same moment. The water temperature sensor is used to detect the main water temperature of the engine.

[0037] The control unit of the thermal management control module is used to control the engine cooling circuit to enter the fully open state of the large circulation when the water temperature sensor is abnormal.

[0038] An engine protection device includes a memory and a processor;

[0039] The memory stores a program suitable for execution by the processor, the program being used to perform each step of any of the above-described engine protection methods.

[0040] An automobile includes the aforementioned engine protection device.

[0041] Based on the above technical solution, the solution provided in this embodiment of the invention determines whether the water temperature sensor is abnormal when the engine starts and enters the warm-up state. If it is abnormal, it indicates that the main water temperature detected by the water temperature sensor is not the true main water temperature. At this time, since it is impossible to accurately determine whether the engine is overheating, the cooling circuit can be directly controlled to enter the full-circulation state through the heat management and control module when the water temperature sensor is detected to be abnormal. This allows the coolant to cool the engine in a timely and effective manner, keeping the engine temperature within the normal range. Therefore, compared with the existing solution, this solution can control the engine cooling circuit to enter the full-circulation state when the water temperature sensor is abnormal, thereby effectively cooling the engine in a timely manner and preventing engine damage caused by excessively high engine temperature. Attached Figure Description

[0042] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0043] Figure 1 This is a schematic flowchart of the engine protection method disclosed in the embodiments of this application;

[0044] Figure 2 This is a schematic flowchart of an engine protection method disclosed in another embodiment of this application;

[0045] Figure 3 This is a schematic flowchart of an engine protection method disclosed in another embodiment of this application;

[0046] Figure 4 This is a schematic flowchart of an engine protection method disclosed in another embodiment of this application;

[0047] Figure 5 This is a schematic diagram of the engine protection device disclosed in the embodiments of this application;

[0048] Figure 6This is a schematic diagram of the engine protection device disclosed in the embodiments of this application. Detailed Implementation

[0049] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0050] During engine start-up and warm-up, the cooling circuit state of the heat management and control module changes sequentially: initial opening of the small circulation (internal engine circulation) – full opening of the small circulation (internal engine circulation) – initial opening of the large circulation (flowing through the radiator) – full opening of the large circulation (flowing through the radiator). When the water temperature sensor malfunctions, the water temperature detected by the sensor becomes distorted. If the engine control module (ECM) controls the opening of the heat management and control module according to the distorted water temperature (lower water temperature), the engine may remain in the small circulation state or even in a state with a very small small circulation opening. This prevents the heat management and control module from controlling the engine's cooling circuit to enter the large circulation state, which can lead to engine overheating. If the engine temperature is too high, it will damage the engine.

[0051] Based on the above scenario, this application discloses an engine protection method when the water temperature sensor is abnormal during the engine warm-up process. The method detects whether the water temperature sensor is abnormal during the engine warm-up process. When an abnormality is found, the heat management and control module controls the engine cooling circuit to enter the full-circulation state, thereby preventing the engine from being damaged due to excessive temperature because it cannot enter the full circulation state in time.

[0052] For details, see Figure 1 This application discloses an engine protection method, which may include steps S101 and S102.

[0053] Step S101: When the engine is in warm-up mode, determine whether the water temperature sensor is abnormal;

[0054] In this step, the specific method for determining whether the water temperature sensor is abnormal is as follows: obtain the actual temperature detected by the water temperature sensor and the theoretical temperature of the water temperature sensor; based on the comparison result of the actual temperature and the theoretical temperature at the same time, determine whether the water temperature sensor is abnormal, wherein the water temperature sensor is used to detect the main engine water temperature.

[0055] The application scenario of this solution is when the engine starts and is in the warm-up state. Under normal conditions, in this state, the engine cooling circuit first enters the small circulation. As the warm-up process continues, the temperature of the engine's main water circuit monitored by the water temperature sensor continues to rise. When the temperature detected by the water temperature sensor reaches the pre-calibrated closed-loop water temperature T0 of the heat management and control module (which can be set to 95 degrees), the engine cooling circuit first enters the large circulation state under the control of the heat management and control module, thereby ensuring that the engine temperature does not become too high.

[0056] During the above process, if the water temperature sensor malfunctions, for example, if it cannot effectively detect the engine main water temperature or cannot upload the detected engine main water temperature, the detected main water temperature will be lower than the actual main water temperature. When the actual main water temperature exceeds the closed-loop water temperature, the main water temperature detected by the vehicle terminal through the water temperature sensor will still be a low temperature value. At this time, the engine cooling circuit will not enter the large circulation state, and the engine temperature will continue to rise.

[0057] To prevent the above situation from occurring, this step performs anomaly diagnosis on the water temperature sensor during engine warm-up. During the diagnosis process, the temperature detected by the water temperature sensor at the same moment is compared with the theoretical output temperature of the water temperature sensor at that moment. If the temperature detected by the water temperature sensor is lower than the theoretical output temperature, it indicates that the water temperature sensor is abnormal. The theoretical output temperature is the main water temperature monitored by the water temperature sensor under normal conditions at that moment under the same engine operating conditions. The diagnosis results determine whether the water temperature sensor can reliably detect and upload the true temperature of the main water temperature. When the water temperature sensor cannot reliably detect and upload the true temperature of the main water temperature, it indicates that the water temperature sensor is abnormal. At this time, step S102 is executed.

[0058] Step S102: When the water temperature sensor is abnormal, the heat management and control module controls the engine cooling circuit to enter the fully open state of the large circulation.

[0059] When step S101 determines that the water temperature sensor is malfunctioning, it indicates that the main water temperature detected by the sensor is not the actual main water temperature. Since it is impossible to accurately determine whether the engine is overheating, the cooling circuit can be directly controlled to enter a fully open state through the thermal management and control module when the water temperature sensor malfunctions. In this state, the thermal management and control module and the cooling fan are fully open, or maintained at a high fixed opening. The thermal management and control module controls the engine cooling circuit to enter a fully open state, allowing the coolant to effectively cool the engine in a timely manner, keeping the engine temperature within the normal range. Therefore, compared to existing solutions, this approach can time-control the engine cooling circuit to enter a fully open state when the water temperature sensor malfunctions, thus effectively cooling the engine and preventing engine damage caused by excessively high engine temperatures.

[0060] Step S101 above requires determining whether the water temperature sensor is malfunctioning. Those skilled in the art can select an appropriate judgment strategy based on design requirements to determine whether the water temperature sensor is malfunctioning. For example, in the technical solution disclosed in this embodiment, the main water temperature detected by the water temperature sensor during engine warm-up can be compared with the theoretical value of the main water temperature during engine warm-up. The comparison result is used to determine whether the water temperature sensor is malfunctioning. For details, see [link to documentation]. Figure 2 In this embodiment, the process of determining whether the water temperature sensor is abnormal may specifically include steps S201-S204.

[0061] Step S201: Start timing when entering the warm-up and heating state.

[0062] In this scheme, when the engine is detected to start and enter the warm-up condition, the timer is controlled to start counting. The purpose of timing is to count the total time for the engine to enter the warm-up condition so as to determine the theoretical output temperature in step S203 based on the timing duration.

[0063] Step S202: Obtain the actual output temperature of the water temperature sensor, the ambient temperature of the car, and the heating setting of the air conditioner.

[0064] During engine warm-up, the temperature change of the engine's main coolant temperature under theoretical conditions is related to the ambient temperature of the vehicle, the heating setting of the vehicle's air conditioner during warm-up, and the duration of entering the warm-up state. Before implementing this solution, a mapping relationship can be established in advance between the warm-up duration (equivalent to the statistical duration of the timer mentioned above), the ambient temperature of the vehicle, the heating setting of the air conditioner, and the engine's main coolant temperature under theoretical conditions.

[0065] The process of establishing this mapping relationship is as follows:

[0066] By combining different ambient temperatures and air conditioning heating settings, various operating conditions were obtained. For each of these conditions, a set of tests was conducted to measure the main coolant temperature rise during engine warm-up, resulting in curves showing the change in main coolant temperature over warm-up time. Once the engine operating conditions are determined, the theoretical main coolant temperature corresponding to the specified warm-up time can be determined by comparing these curves.

[0067] In addition to establishing the aforementioned temperature change curve, this application can also construct a mapping relationship between warm-up time and engine coolant temperature under different operating conditions by establishing a mapping table. Specifically, for each of the aforementioned different operating conditions, a set of tests on the main coolant temperature rise during the car's warm-up process is conducted to obtain a table of the coolant temperature rise time during the car's warm-up process. The form of this table is shown in Table 1. In Table 1, the first column on the left represents the air conditioning setting, the second row represents the ambient temperature, and the intersection of the row and column represents the theoretical time required for the main coolant temperature to reach a target temperature under a certain air conditioning setting and ambient temperature, in seconds. It can be seen that the time required for the engine to reach a certain target main coolant temperature can be obtained through the coolant temperature rise time table. At this time, different coolant temperature rise time tables can be established for different target main coolant temperatures. By looking up these time tables, the theoretical temperature of the main coolant corresponding to each warm-up time under the current engine operating conditions can be obtained.

[0068]

[0069] Table 1

[0070] Step S203: Obtain the theoretical output temperature of the water temperature sensor that matches the timing results, the ambient temperature of the car, and the heating setting of the air conditioner.

[0071] In this step, once the ambient temperature of the car and the heating setting of the air conditioner are determined, the engine's operating condition is also determined. Then, the timing result is used as the engine's warm-up time. Finally, based on the theoretical main coolant temperature corresponding to the warm-up time under different operating conditions, the theoretical output temperature of the coolant sensor that matches the timing result, the ambient temperature of the car, and the heating setting of the air conditioner can be determined. This theoretical output temperature is the theoretical main coolant temperature that should be output at the current moment if the coolant temperature sensor is fault-free.

[0072] Step S204: Based on the comparison between the actual output temperature and the theoretical output temperature, determine whether the water temperature sensor is abnormal.

[0073] In this step, the actual output temperature of the water temperature sensor and its theoretical output temperature at the same time can be obtained in real time. By comparing the actual and theoretical output temperatures at the same time, it can be determined whether the water temperature sensor is malfunctioning. Specifically, in this solution, the malfunction of the water temperature sensor can be determined by comparing whether the difference between the two is greater than a preset value. At this time, the difference between the actual output temperature and the theoretical output temperature can be calculated. When the difference is greater than a pre-calibrated preset value, it can be determined that the water temperature sensor is malfunctioning. For example, a preset value of 10 degrees or other values ​​can be preset. When the difference between the actual output temperature and the theoretical output temperature is greater than 10 degrees, it indicates that the water temperature sensor is malfunctioning. At this time, in order to prevent the main water temperature from being too high and causing engine damage, the TMM can be fully opened, so that the cooling circuit enters the large circulation fully open state. When the difference between the actual output temperature and the theoretical output temperature is less than 10 degrees, it indicates that the water temperature sensor can normally collect the main water temperature, and the water temperature sensor is not malfunctioning.

[0074] In the technical solution disclosed in this embodiment, after confirming that the water temperature sensor is normal, the engine's main coolant temperature may be at a relatively low level. At this time, it is not necessary for the cooling pipes to enter the fully open large-loop state; the cooling pipes can remain in the small-loop state. Only when the engine's main coolant temperature reaches the preset closed-loop temperature is it necessary to switch the cooling pipes to the fully open large-loop state. To estimate whether the engine's main coolant temperature has been reached, the warm-up time corresponding to the theoretical temperature of the main coolant reaching the closed-loop temperature can be used as the time required for the engine's main coolant temperature to reach the closed-loop temperature. The time corresponding to this duration is taken as the target duration. See [link to relevant documentation]. Figure 3 After confirming the water temperature sensor is faulty, before the heat management and control module controls the engine cooling circuit to enter the fully open large circulation state, the following steps are also included:

[0075] Step S301: Has the timed duration reached the target duration?

[0076] In this step, the timing duration of the timer is detected to determine whether the timing duration has reached the target duration. That is, when the timing duration of the timer reaches the warm-up time corresponding to the theoretical temperature reaching the closed-loop water temperature, it indicates that the timing duration has reached the target duration. In other words, the target duration is the time when the theoretical output temperature of the temperature sensor reaches the closed-loop water temperature, which is determined based on the ambient temperature of the car and the heating setting of the air conditioner. In this scheme, the target duration can be determined by the mapping relationship introduced in step S202 (the mapping relationship between warm-up time, ambient temperature of the car, heating setting of the air conditioner and the main water temperature of the engine under theoretical conditions).

[0077] Step S302: When the timing duration reaches the target duration, determine whether the actual output temperature is less than the closed-loop water temperature of the heat management and control module.

[0078] In this embodiment, considering that the abnormality of the water temperature sensor may be caused by some unexpected factors, the water temperature sensor will return to normal after these unexpected factors are eliminated. At this time, the water temperature sensor can monitor the main water temperature of the engine normally. At this time, conventional control logic can be used to control the thermal management and control module. The so-called conventional control logic can be understood as the existing control logic of the thermal management and control module. When determining whether the water temperature sensor has returned to normal, the actual output temperature can be compared with the closed-loop water temperature of the thermal management and control module after the target time has elapsed. Based on the comparison result, it is determined whether the water temperature sensor has returned to normal. For example, if the actual output temperature is less than the closed-loop water temperature of the thermal management and control module after the target time has elapsed, it indicates that the water temperature sensor is still in an abnormal state. Otherwise, it indicates that the water temperature sensor has returned to normal, and the thermal management and control module is controlled to enter the conventional control logic.

[0079] In this step, if the actual output temperature is lower than the closed-loop water temperature, and the engine is not cooled down, it may cause the engine to overheat and be damaged. At this time, it is necessary to perform an action to control the engine cooling circuit to enter the fully open state of the large circulation through the heat management and control module.

[0080] In this embodiment, after the engine cooling circuit enters the fully open large-circuit state, the abnormal state of the water temperature sensor can continue to be detected. Once the water temperature sensor is detected to have returned to normal, the heat management and control module is controlled to enter normal control logic. If, after a period of time in the fully open large-circuit state, the water temperature sensor is still determined to be in an abnormal state, the engine cooling circuit will be kept in the fully open large-circuit state for the next engine start-up cycle. For details, see [link to documentation]. Figure 4 In the above method, after the engine cooling circuit is controlled to enter the fully open state of the large circulation by the heat management and control module, steps S401-S404 are also included.

[0081] Step S401: Obtain the engine coolant temperature via the second circuit.

[0082] The dual-channel water temperature sensor is used to detect the water temperature at the radiator end. This water temperature can also be referred to as the dual-channel water temperature. If the water temperature sensor is normal, after the cooling circuit enters the fully open state of the large circulation, since the dual-channel water temperature sensor detects the water temperature at the radiator end, the water temperature value of the engine's dual-channel water temperature should be lower than the main water temperature detected by the water temperature sensor. In this embodiment, the water temperature sensor can be judged to be abnormal by comparing the engine's dual-channel water temperature with the main water temperature. Therefore, it is necessary to obtain the engine's dual-channel water temperature in this step.

[0083] In this embodiment, if the engine cooling circuit is fully open and the engine secondary water temperature is obtained immediately, the subsequent judgment result will be unreliable. Therefore, in order to ensure the reliability of the detection result, in this step, the engine secondary water temperature can be obtained after a preset time when the engine cooling circuit is fully open. At this time, the judgment result of this solution can be more reliable. Here, the preset time can be set according to the design requirements. For example, in the technical solution disclosed in this application embodiment, the preset time can be 5 minutes, 10 minutes, 20 minutes or other durations.

[0084] Step S402: Determine whether the output temperature of the water temperature sensor is greater than the engine's second-channel water temperature.

[0085] In this step, the temperature detected by the water temperature sensor is compared with the engine's secondary water temperature to determine whether the output temperature of the water temperature sensor is greater than the engine's secondary water temperature. If it is greater, it means that the water temperature sensor has returned to normal, and step S403 can be executed at this time. Otherwise, the engine cooling circuit is kept in the fully open state of the large circulation.

[0086] Step S403: When the output temperature of the water temperature sensor is greater than the engine's second-channel water temperature, control the heat management and control module to enter the normal control logic.

[0087] In this step, when the output temperature of the water temperature sensor is greater than the engine's dual water temperature, it indicates that the water temperature sensor is working normally. At this time, the heat management and control module is controlled to enter the normal control logic.

[0088] Step S404: When the output temperature of the water temperature sensor is lower than the engine's dual-channel water temperature, control the engine cooling circuit to remain in the fully open state of the large circulation, and at the same time, suppress the conventional control logic of the heat management and control module.

[0089] In this step, if the output temperature of the water temperature sensor is lower than the engine's dual water temperature, the water temperature sensor is still considered abnormal. At this time, the abnormality of the water temperature sensor can be determined to be an abnormality that cannot be automatically recovered. In order to prevent data conflicts from occurring in the heat management and control module during data processing and causing a fault, the diagnosis of the heat management and control module can be suppressed, so that the heat management and control module cannot execute the normal control logic. This suppression process can maintain the entire engine start-up cycle.

[0090] In the technical solution disclosed in this embodiment, when the engine starts and enters the warm-up condition, after the water temperature sensor is initially determined to be abnormal, the fault type of the water temperature sensor can be detected in advance. If the detected engine abnormality is a type of fault that cannot be automatically repaired, the engine cooling circuit can be directly controlled to enter the fully open large circulation state, and the cooling circuit will remain in the fully open large circulation state during the subsequent engine start-up cycle. That is, after determining that the water temperature sensor is abnormal, before controlling the engine cooling circuit to enter the fully open large circulation state through the heat management and control module, the method further includes: performing fault diagnosis on the water temperature sensor. When performing fault diagnosis on the water temperature sensor, various fault diagnosis logics in the pre-stored fault diagnosis logic set can be used to diagnose the water temperature sensor. The coolant temperature sensor undergoes fault diagnosis. The specific diagnostic logic within this fault diagnosis logic set can be configured according to design requirements. For example, the diagnostic logic may include logic for diagnosing circuit faults in the coolant temperature sensor and logic for diagnosing low-voltage side power-on faults. When fault diagnosis is performed on the coolant temperature sensor based on this fault diagnosis logic set—for example, diagnosing circuit faults or performing low-voltage side power-on faults—if the diagnostic result indicates a fault in the coolant temperature sensor, a prompt message characterizing the fault is generated and output. Simultaneously, the engine cooling circuit is controlled by the heat management and control module to enter and remain in a fully open large-circuit state until the vehicle is powered off. Similarly, if the vehicle is a hybrid, this solution is only executed when the engine is running; it is disabled when the engine is stopped.

[0091] This embodiment discloses an engine protection device. For the specific working function of each unit in the device, please refer to the content of the above method embodiment.

[0092] The engine protection device provided in the embodiments of the present invention is described below. The engine protection device described below and the engine protection method described above can be referred to in correspondence.

[0093] See Figure 5 The device may include a water temperature sensor abnormality detection unit 10 and a thermal management control module control unit 20;

[0094] Corresponding to step S101 in the above method, the water temperature sensor abnormality detection unit 10 is used to determine whether the water temperature sensor is abnormal when the engine is in the warm-up condition. The water temperature sensor is used to detect the main water temperature of the engine.

[0095] Corresponding to step S102 in the above method, the corresponding thermal management control module control unit 20 is used to control the engine cooling circuit to enter the fully open state of the large circulation through the thermal management and control module when the water temperature sensor is abnormal.

[0096] The water temperature sensor anomaly detection unit 10 and the thermal management control module control unit 20 disclosed in this embodiment are also used to execute the various steps in the above-described engine protection method embodiment, which will not be repeated here.

[0097] Figure 6 This is a hardware structure diagram of an engine protection device provided in an embodiment of the present invention. This engine protection device can be loaded into the vehicle's on-board computer or other in-vehicle systems. See [link / reference]. Figure 6 As shown, it may include: at least one processor 100, at least one communication interface 200, at least one memory 300 and at least one communication bus 400;

[0098] In this embodiment of the invention, the number of processor 100, communication interface 200, memory 300, and communication bus 400 is at least one, and the processor 100, communication interface 200, and memory 300 communicate with each other through communication bus 400; obviously, Figure 6 The communication connections shown for the processor 100, communication interface 200, memory 300, and communication bus 400 are optional.

[0099] Optionally, the communication interface 200 can be an interface of a communication module, such as the interface of a GSM module;

[0100] Processor 100 may be a central processing unit (CPU), an application-specific integrated circuit (ASIC), or one or more integrated circuits configured to implement embodiments of the present invention.

[0101] The memory 300 may include high-speed RAM memory, and may also include non-volatile memory, such as at least one disk storage device.

[0102] Specifically, the processor 100 is used to execute each step of any of the above-mentioned engine protection methods.

[0103] For example, the processor 100 can be used to: determine whether the water temperature sensor is abnormal when the engine is in the warm-up condition, the water temperature sensor being used to detect the main water temperature of the engine; when the water temperature sensor is abnormal, control the engine cooling circuit to enter the full-circulation state through the heat management and control module.

[0104] Corresponding to the above embodiments, this application also discloses an automobile that can be equipped with the above-mentioned engine protection device. The specific type of automobile can be a model with only one cylinder block / cylinder head water temperature sensor, which is the water temperature sensor mentioned above.

[0105] For ease of description, the above system is described by dividing it into various modules based on their functions. Of course, in implementing this invention, the functions of each module can be implemented in one or more software and / or hardware components.

[0106] The various embodiments in this specification are described in a progressive manner. Similar or identical parts between embodiments can be referred to mutually. Each embodiment focuses on describing the differences from other embodiments. In particular, for system or system embodiments, since they are basically similar to method embodiments, the description is relatively simple, and relevant parts can be referred to the descriptions in the method embodiments. The systems and system embodiments described above are merely illustrative. The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the modules can be selected to achieve the purpose of this embodiment according to actual needs. Those skilled in the art can understand and implement this without creative effort.

[0107] Those skilled in the art will further recognize that the units and algorithm steps of the various examples described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, computer software, or a combination of both. To clearly illustrate the interchangeability of hardware and software, the components and steps of the various examples have been generally described in terms of functionality in the foregoing description. Whether these functions are implemented in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementations should not be considered beyond the scope of this invention.

[0108] The steps of the methods or algorithms described in conjunction with the embodiments disclosed herein can be implemented directly by hardware, a software module executed by a processor, or a combination of both. The software module can be located in random access memory (RAM), main memory, read-only memory (ROM), electrically programmable ROM, electrically erasable programmable ROM, registers, hard disk, removable disk, CD-ROM, or any other form of storage medium known in the art.

[0109] It should also be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0110] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. An engine protection method, characterized in that, include: The timer starts when the engine is warming up. The system acquires the actual output temperature of the water temperature sensor, the ambient temperature of the vehicle, and the heating setting of the air conditioner. The water temperature sensor is used to detect the main engine water temperature. Obtain the theoretical output temperature of the water temperature sensor that matches the timing results, the ambient temperature of the car, and the heating setting of the air conditioner; Based on the comparison between the actual output temperature and the theoretical output temperature, determine whether the water temperature sensor is malfunctioning. When the water temperature sensor is found to be abnormal, it is determined whether the timing duration has reached the target duration. The target duration is the time when the theoretical output temperature of the water temperature sensor reaches the closed-loop water temperature, which is determined based on the ambient temperature of the vehicle and the heating setting of the air conditioner. The closed-loop water temperature is the closed-loop water temperature of the heat management and control module. When the timing duration reaches the target duration, determine whether the actual output temperature is less than the closed-loop water temperature of the heat management and control module; When the actual output temperature is lower than the closed-loop water temperature, the engine cooling circuit is controlled by the heat management and control module to enter the fully open state of the large circulation.

2. The engine protection method according to claim 1, characterized in that, Based on the comparison between the actual output temperature and the theoretical output temperature, determine whether the water temperature sensor is malfunctioning, including: Determine whether the difference between the actual output temperature and the theoretical output temperature is greater than a preset value. If the difference between the actual output temperature and the theoretical output temperature is greater than the preset value, determine that the water temperature sensor is abnormal.

3. The engine protection method according to claim 1, characterized in that, After the engine cooling circuit is controlled to enter a fully open large circulation state by the heat management and control module, it also includes: Obtain the engine coolant temperature via two channels; Determine whether the output temperature of the water temperature sensor is greater than the engine's dual-channel water temperature; When the actual output temperature of the water temperature sensor is greater than the engine's dual water temperature, the heat management and control module is controlled to enter the normal control logic. When the actual output temperature of the water temperature sensor is lower than the engine's dual-circuit water temperature, the engine cooling circuit is controlled to remain in the fully open state of the large circulation loop, while the routine diagnostics of the heat management and control module are suppressed.

4. The engine protection method according to any one of claims 1-3, characterized in that, The engine cooling circuit is controlled to enter a fully open large-circuit state through the heat management and control module, including: Perform fault diagnosis on the water temperature sensor; When the water temperature sensor malfunctions, a prompt message is generated and output to characterize the malfunction. The control module controls the engine cooling circuit to enter and maintain the large circulation fully open state.

5. The engine protection method according to claim 4, characterized in that, Fault diagnosis of the water temperature sensor includes: Perform circuit fault diagnosis on the water temperature sensor; Perform a low-pressure side power-on diagnostic on the water temperature sensor.

6. An engine protection device, characterized in that, include: Water temperature sensor anomaly detection unit and thermal management control module control unit; The water temperature sensor anomaly detection unit is used to start timing when the engine is in warm-up mode; acquire the actual output temperature of the water temperature sensor, the ambient temperature of the vehicle, and the heating setting of the air conditioner; acquire the theoretical output temperature of the water temperature sensor that matches the timing result, the ambient temperature of the vehicle, and the heating setting of the air conditioner; and determine whether the water temperature sensor is abnormal based on the comparison result between the actual output temperature and the theoretical output temperature. The water temperature sensor is used to detect the main engine water temperature. The thermal management control module control unit is used to determine whether the timing duration has reached the target duration when the water temperature sensor malfunctions. The target duration is determined based on the ambient temperature of the vehicle and the heating setting of the air conditioner, and is the time when the theoretical output temperature of the water temperature sensor reaches the closed-loop water temperature, which is the closed-loop water temperature of the thermal management and control module. When the timing duration reaches the target duration, it determines whether the actual output temperature is lower than the closed-loop water temperature of the thermal management and control module. When the actual output temperature is lower than the closed-loop water temperature, the thermal management and control module controls the engine cooling circuit to enter a fully open large-circuit state.

7. An engine protection device, characterized in that, Including memory and processor; The memory stores a program suitable for execution by the processor, the program being used to perform the various steps of the engine protection method according to any one of claims 1-5.

8. A car, characterized in that, Includes the engine protection device as described in claim 7.

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