Retarder control method, device, vehicle and computer readable storage medium

Abstract

This application relates to a retarder control method, device, vehicle, and computer-readable storage medium. The retarder control method includes: limiting the maximum output torque of the retarder within the engine speed range based on the engine speed range; and adjusting the torque-limiting oil temperature threshold of the retarder based on the engine speed range. This application limits the maximum output torque of the retarder within the engine speed range and adjusts the torque-limiting oil temperature threshold of the retarder based on the engine speed range. By limiting the maximum torque of the retarder within the engine speed range, the risk of coolant temperature overshoot is reduced, and the risk of the retarder disengaging is also reduced. Limiting the retarder torque at low engine speeds avoids the problem of high retarder coolant temperature at low speeds, thereby reducing cooling system backflow failures. Furthermore, adjusting the torque-limiting oil temperature threshold based on the engine speed range can solve the problem of retarder coolant temperature overshoot caused by excessively high retarder oil temperature.

Description

Technical Field

[0001] This application relates to the field of hydraulic retarder control technology, specifically to a retarder control method, device, vehicle, and computer-readable storage medium. Background Technology

[0002] Currently, hydraulic retarders, as an important auxiliary braking device for commercial vehicles, primarily convert vehicle kinetic energy into heat energy through hydraulic friction, which is then dissipated by the engine cooling system. During long downhill slopes or high-load braking conditions, the continuous operation of the retarder generates a significant amount of heat. Therefore, a reasonable water temperature control scheme is crucial for ensuring the retarder's braking performance, preventing cooling system failures, and extending component lifespan.

[0003] In related technologies, the current retarder control strategy is based on the temperature sensor threshold of the retarder itself. The specific scheme is as follows: when the water temperature is higher than 100℃ or the oil temperature is higher than 120℃, the torque is limited. When the water temperature is higher than 115℃ or the oil temperature is higher than 140℃, the torque is completely deactivated. When either the water temperature or the oil temperature reaches the trigger condition, the torque limiting mode will be entered.

[0004] However, this method of entering torque-limiting mode when the water temperature or oil temperature reaches the control threshold can cause the retarder to frequently exit the fault and cause the cooling system water temperature to overshoot, which in turn leads to backflow fault.

[0005] Therefore, it is necessary to design a new retarder control method to overcome the above problems. Summary of the Invention

[0006] This application provides a retarder control method, device, vehicle, and computer-readable storage medium, which can solve the technical problems of frequent retarder disengagement and cooling system backflow failure in related technologies.

[0007] In a first aspect, embodiments of this application provide a retarder control method, the retarder control method comprising: The maximum output torque of the retarder is limited according to the engine speed range in which the engine speed is located; The torque limiting oil temperature threshold of the retarder is adjusted according to the engine speed range.

[0008] In conjunction with the first aspect, in one embodiment, limiting the maximum output torque of the retarder in the current speed range based on the engine speed range includes: If the engine speed is less than or equal to the first speed, the output torque of the retarder is less than or equal to the first output torque. If the engine speed is greater than the first speed and less than or equal to the second speed, then the output torque of the retarder is less than or equal to the second output torque; wherein the second output torque is greater than the first output torque.

[0009] In this embodiment, the engine speed is divided into at least two speed ranges (the first speed range and the second speed range). The maximum output torque is specially set for different speed ranges. Within each speed range, the output torque of the retarder does not exceed the maximum output torque corresponding to that speed range. Furthermore, at low engine speeds, a limit is added to the maximum output torque of the retarder.

[0010] In conjunction with the first aspect, in one implementation, if the engine speed is greater than the second speed, the output torque of the retarder is not limited. In this embodiment, when it is determined that the engine speed is not in the first speed range and not in the second speed range, it is determined whether the engine speed is in the third speed range. If the engine speed is in the third speed range, the output torque of the retarder is not limited.

[0011] In conjunction with the first aspect, in one embodiment, if the engine speed increases to a level greater than a second speed, then after the engine speed decreases to a level less than a third speed, the output torque of the retarder is controlled to be less than or equal to the second output torque; wherein the third speed is less than the second speed but greater than the first speed. This embodiment, by adding this anti-vibration mechanism, can prevent the control system from frequently fluctuating near a threshold (e.g., the speed fluctuates at a critical point, causing the retarder to frequently limit torque or not limit torque).

[0012] In conjunction with the first aspect, in one implementation, if the engine speed is less than or equal to a first speed, the flow rate of the electronic water pump is increased. In this embodiment, in vehicles equipped with an electronic water pump, the auxiliary brake can also be activated when the engine speed is low, forcing the electronic water pump to increase its flow rate. When the retarder is engaged, forcibly increasing the water pump flow rate ensures stable retarder cooling power.

[0013] In conjunction with the first aspect, in one embodiment, adjusting the torque-limiting oil temperature threshold of the retarder according to the engine speed range includes: If the engine speed is less than or equal to the first speed, the torque limiting oil temperature threshold of the retarder is adjusted to the first temperature threshold, and the retarder is set to stop working when the oil temperature reaches the second temperature threshold; wherein, the second temperature threshold is greater than the first temperature threshold. If the engine speed is greater than the first speed and less than or equal to the second speed, the torque limiting oil temperature threshold of the retarder is adjusted to the third temperature threshold, and the retarder is set to stop working when the oil temperature reaches the fourth temperature threshold; wherein, the third temperature threshold is greater than the first temperature threshold, the second temperature threshold is greater than the third temperature threshold, and the fourth temperature threshold is greater than the second temperature threshold.

[0014] In this embodiment, the engine speed is divided into at least two speed ranges, and a suitable torque limiting oil temperature threshold is set for each speed range. In the first speed range, torque is limited when the oil temperature reaches 110°C, and the retarder completely disengages when the oil temperature reaches 125°C. In the second speed range, torque is limited when the oil temperature reaches 120°C, and the retarder completely disengages when the oil temperature reaches 130°C.

[0015] In conjunction with the first aspect, in one embodiment, if the engine speed is greater than the second speed, the torque-limiting oil temperature threshold of the retarder is adjusted to the third temperature threshold, and the retarder is set to disengage when the oil temperature reaches the fifth temperature threshold; wherein, the fifth temperature threshold is greater than the fourth temperature threshold. In this embodiment, when it is determined that the engine speed is not in the first speed range and not in the second speed range, it is determined whether the engine speed is in the third speed range. If the engine speed is in the third speed range, the torque-limiting oil temperature threshold of the retarder is adjusted to 120°C, and the retarder is set to completely disengage when the oil temperature reaches 140°C.

[0016] Secondly, embodiments of this application provide a retarder control device, the retarder control device comprising: The controller is used to limit the maximum output torque of the retarder in the current speed range according to the engine speed range; and to adjust the torque limiting oil temperature threshold of the retarder according to the engine speed range.

[0017] Thirdly, embodiments of this application provide a vehicle equipped with the aforementioned retarder control device.

[0018] Fourthly, embodiments of this application provide a computer-readable storage medium storing a retarder control program, wherein when the retarder control program is executed by a processor, it implements the steps of the above-described retarder control method.

[0019] The beneficial effects of the technical solutions provided in this application include: The maximum output torque of the retarder is limited within the engine speed range, and the torque limiting oil temperature threshold of the retarder is adjusted according to the engine speed range. By limiting the maximum torque of the retarder within the engine speed range, the risk of water temperature overshoot is reduced, and the risk of the retarder disengaging is also reduced. Limiting the retarder torque at low engine speeds can avoid the problem of high retarder water temperature at low speeds, thereby reducing the risk of cooling system backflow failure. Furthermore, adjusting the torque limiting oil temperature threshold according to the engine speed range can solve the problem of retarder water temperature overshoot caused by excessively high retarder oil temperature. This solves the technical problems of frequent retarder disengagement failure and cooling system backflow failure in related technologies. Attached Figure Description

[0020] Figure 1 This is a flowchart illustrating an embodiment of the retarder control method of this application; Figure 2 This is a flowchart illustrating another embodiment of the retarder control method of this application. Detailed Implementation

[0021] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present application.

[0022] In related technologies, the retarder water temperature control strategy relies on the retarder's own temperature sensor threshold. This temperature control method only adjusts the water temperature when it reaches the threshold, but the rate of temperature rise is not included in its control scheme. According to the retarder's working principle, its braking power efficiency is directly proportional to the cooling system power, and the cooling system power is directly affected by the water pump efficiency. Higher engine speeds result in greater water flow and higher heat dissipation efficiency. Therefore, the rate of temperature rise of the retarder is strongly correlated with engine speed.

[0023] The current control strategy only protects the cooling system by entering a torque-limiting mode when the water temperature or oil temperature reaches a control threshold. However, based on market feedback, the following two main problems exist: Frequent retarder disengagement: When using the retarder at low speeds, it is very easy for it to overheat and disengage on slopes or at high speeds. Users may mistakenly believe that the retarder has malfunctioned, which will affect user reputation.

[0024] Cooling system backflow fault: When the engine coolant flow is low, the retarder coolant temperature rises rapidly after the retarder is activated. At this time, the coolant flow is low and the retarder end dissipates heat slowly. If the coolant temperature rises too high, the coolant will vaporize, and the increased pressure in the cooling system will cause backflow in the auxiliary water tank.

[0025] In both of these situations, it is difficult to control the situation using existing retarder temperature control strategies alone, and drivers need considerable experience in using retarders to operate them proficiently.

[0026] This application provides a retarder control method, device, vehicle, and computer-readable storage medium, which can solve the technical problems of frequent retarder disengagement and cooling system backflow failure in related technologies.

[0027] To make the objectives, technical solutions, and advantages of this application clearer, the embodiments of this application will be described in further detail below with reference to the accompanying drawings.

[0028] In a first aspect, embodiments of this application provide a retarder control method.

[0029] In one embodiment, reference is made to Figure 1 , Figure 1 This is a schematic flowchart of the first embodiment of the retarder control method of this application. Figure 1 As shown, the retarder control method includes: S100: Limits the maximum output torque of the retarder within the engine speed range based on the engine speed range.

[0030] S200: Adjusts the torque limiting oil temperature threshold of the retarder according to the engine speed range.

[0031] In this embodiment, the engine speed range can be determined based on the vehicle's water flow curve. The vehicle's water flow and engine speed have a linear relationship; therefore, a speed suitable for most engines can be determined based on their water flow characteristics. The speed does not necessarily have to be a fixed value. Large-displacement engines, with their high cooling system heat dissipation power, can have lower speeds, while small-displacement engines may require higher speeds.

[0032] In the above embodiments, the percentage of output torque limitation can be determined by the ratio of the cooling power of the water flow rate at the corresponding engine speed to the maximum cooling power; for example, the cooling power is about 50% at low speeds, so the torque can also be limited to 50%. The oil temperature threshold can be adjusted according to the expected temperature rise rate at the current speed; at low speeds, if the cooling is not timely, the oil temperature may rise faster, so it is necessary to limit the torque in advance.

[0033] It should be understood that in the above embodiments, in each engine speed range, the maximum output torque of the retarder in the current range can be limited, and the torque limiting oil temperature threshold can also be adjusted.

[0034] This embodiment limits the maximum output torque of the retarder within the engine speed range and adjusts the torque-limiting oil temperature threshold of the retarder according to the engine speed range. By limiting the maximum torque of the retarder within the engine speed range, the risk of water temperature overshoot is reduced, and the risk of the retarder disengaging is also reduced. Limiting the retarder torque at low engine speeds avoids the problem of high retarder water temperature at low speeds, thereby reducing the risk of cooling system backflow failure. Furthermore, adjusting the torque-limiting oil temperature threshold according to the engine speed range can solve the problem of retarder water temperature overshoot caused by excessively high retarder oil temperature. This solves the technical problems of frequent retarder disengagement and cooling system backflow failure in related technologies.

[0035] This embodiment intervenes in advance to prevent the retarder from suddenly stopping without the user noticing a malfunction, eliminating the negative experience of users mistakenly believing a fault has occurred and improving product reputation and usability. Furthermore, the system intervenes before the coolant vaporizes due to a rapid rise in water temperature, effectively preventing backflow from the auxiliary water tank caused by a sudden increase in system pressure, protecting the sealing and integrity of the cooling system, and improving vehicle operating safety. Existing technologies often rely on driver experience to avoid overheating, while this embodiment, through optimized control strategies, automatically adapts to different operating conditions, allowing even drivers unfamiliar with vehicle characteristics to safely use the retarder, lowering the operational threshold and enhancing vehicle intelligence and user experience. It also avoids the cooling system being subjected to extreme high-temperature and high-pressure conditions for extended periods, reducing problems such as seal aging and coolant deterioration caused by overheating, thereby extending the service life of the retarder and related engine cooling system components.

[0036] Further, in one embodiment, limiting the maximum output torque of the retarder in the current speed range based on the engine speed range includes: S101: If the engine speed is less than or equal to the first speed, then the output torque of the retarder is less than or equal to the first output torque.

[0037] S102: If the engine speed is greater than the first speed and less than or equal to the second speed, then the output torque of the retarder is less than or equal to the second output torque; wherein the second output torque is greater than the first output torque.

[0038] See Figure 2 As shown, in this embodiment, the first speed is preferably set to 1000 rpm, the second speed is preferably set to 1500 rpm, the first output torque is preferably set to 50% of the maximum torque, and the second output torque is preferably set to 75% of the maximum torque. Initially, this embodiment first acquires the engine speed, then determines whether the engine speed is within the first speed range (i.e., whether the engine speed is less than or equal to 1000 rpm). If the engine speed is within the first speed range, the output torque of the retarder is controlled to be less than or equal to 50% of the maximum torque. If the engine speed is not within the first speed range, it determines whether the engine speed is within the second speed range (i.e., whether the engine speed is greater than 1000 rpm and less than or equal to 1500 rpm). If the engine speed is within the second speed range, the output torque of the retarder is controlled to be less than or equal to 75% of the maximum torque.

[0039] In this embodiment, the engine speed is divided into at least two speed ranges, and a suitable maximum output torque is set for each speed range. Within each speed range, the output torque of the retarder does not exceed the maximum output torque corresponding to that speed range. Furthermore, at low engine speeds (speed less than 1000 rpm), a limit is added on the maximum output torque of the retarder.

[0040] Furthermore, in one embodiment, the retarder control method further includes: S103: If the engine speed is greater than the second speed, then the output torque of the retarder is not limited. See also Figure 2 As shown in this embodiment, when it is determined that the engine speed is not in the first speed range and not in the second speed range, it is determined whether the engine speed is in the third speed range (i.e., whether the engine speed is greater than 1500 rpm). If the engine speed is in the third speed range, the retarder output torque is unlimited.

[0041] Furthermore, in some embodiments, the retarder control method further includes: if the engine speed increases to a level greater than a second speed, then after the engine speed decreases to a level less than a third speed, controlling the output torque of the retarder to be less than or equal to the second output torque; wherein the third speed is less than the second speed but greater than the first speed. See also Figure 2 As shown, in this embodiment, the third speed can be, for example, 1400 rpm. If the engine speed increases to greater than 1500 rpm, the torque control strategy for the second speed range is executed again when the engine speed drops to less than 1400 rpm (that is, controlling the output torque of the retarder to be less than or equal to 75% of the maximum torque). By adding this anti-vibration mechanism, this embodiment can prevent the control system from frequently jumping around the threshold (for example, the speed fluctuates at the critical point, causing the retarder to frequently limit torque or not limit torque).

[0042] Furthermore, in some optional embodiments, the retarder control method may further include increasing the flow rate of the electronic water pump if the engine speed is less than or equal to a first speed. In this embodiment, in vehicles equipped with an electronic water pump, the auxiliary brake may be activated when the engine speed is low (below 1000 rpm), forcing the electronic water pump to increase its flow rate. Forcibly increasing the water pump flow rate when the retarder is engaged ensures stable retarder cooling power.

[0043] Further, in one embodiment, adjusting the torque-limiting oil temperature threshold of the retarder according to the engine speed range includes: S201: If the engine speed is less than or equal to the first speed, the torque limiting oil temperature threshold of the retarder is adjusted to the first temperature threshold, and the retarder is set to stop working when the oil temperature reaches the second temperature threshold; wherein, the second temperature threshold is greater than the first temperature threshold.

[0044] S202: If the engine speed is greater than the first speed and less than or equal to the second speed, the torque limiting oil temperature threshold of the retarder is adjusted to the third temperature threshold, and the retarder is set to stop working when the oil temperature reaches the fourth temperature threshold; wherein, the third temperature threshold is greater than the first temperature threshold, the second temperature threshold is greater than the third temperature threshold, and the fourth temperature threshold is greater than the second temperature threshold.

[0045] See Figure 2 As shown, in this embodiment, the first speed is preferably set to 1000 rpm, the second speed is preferably set to 1500 rpm, the first temperature threshold is preferably set to 110℃, the second temperature threshold is preferably set to 125℃, the third temperature threshold is preferably set to 120℃, and the fourth temperature threshold is preferably set to 130℃. Initially, this embodiment first acquires the engine speed, then determines whether the engine speed is within the first speed range (i.e., whether the engine speed is less than or equal to 1000 rpm). If the engine speed is within the first speed range, the torque limiting oil temperature threshold of the retarder is adjusted to 110℃, and the retarder is set to completely disengage when the oil temperature reaches 125℃. If the engine speed is not within the first speed range, it determines whether the engine speed is within the second speed range (i.e., whether the engine speed is greater than 1000 rpm and less than or equal to 1500 rpm). If the engine speed is within the second speed range, the torque limiting oil temperature threshold of the retarder is adjusted to 120℃, and the retarder is set to completely disengage when the oil temperature reaches 130℃.

[0046] In this embodiment, the engine speed is divided into at least two speed ranges, and a suitable torque limiting oil temperature threshold is set for each speed range. In the first speed range, torque is limited when the oil temperature reaches 110°C, and the retarder completely disengages when the oil temperature reaches 125°C. In the second speed range, torque is limited when the oil temperature reaches 120°C, and the retarder completely disengages when the oil temperature reaches 130°C.

[0047] Furthermore, in one embodiment, the retarder control method further includes S203: if the engine speed is greater than a second speed, the torque-limiting oil temperature threshold of the retarder is adjusted to a third temperature threshold, and the retarder is set to exit operation when the oil temperature reaches a fifth temperature threshold; wherein, the fifth temperature threshold is greater than the fourth temperature threshold. See also Figure 2 As shown, in this embodiment, the fifth temperature threshold is preferably set to 140°C. In this embodiment, when it is determined that the engine speed is not in the first speed range and not in the second speed range, it is determined whether the engine speed is in the third speed range (i.e., whether the engine speed is greater than 1500 rpm). If the engine speed is in the third speed range, the torque limiting oil temperature threshold of the retarder is adjusted to 120°C, and the retarder is set to completely disengage when the oil temperature reaches 140°C.

[0048] This embodiment leverages the positive correlation between engine speed and coolant flow rate. It achieves a balance between retarder power and current temperature control by controlling engine speed and segmented retarder torque and oil temperature thresholds. Specifically, it limits the retarder's maximum torque within a given engine speed range; increases the maximum torque limit at low engine speeds; and adjusts the retarder's oil temperature torque limit threshold based on engine speed. This control strategy effectively reduces retarder disengagement at low speeds, extends retarder operating time, and effectively resolves backflow issues caused by high retarder coolant temperature.

[0049] Secondly, embodiments of this application also provide a retarder control device.

[0050] In one embodiment, the retarder control device may include: a controller, which is used to limit the maximum output torque of the retarder in the current speed range according to the speed range in which the engine speed is located; and to adjust the torque limiting oil temperature threshold of the retarder according to the speed range in which the engine speed is located.

[0051] The functions of each module in the above-mentioned retarder control device correspond to the steps in the above-mentioned retarder control method embodiment, and their functions and implementation processes will not be described in detail here.

[0052] Thirdly, this application also provides a vehicle equipped with the aforementioned retarder control device. The retarder control device in this embodiment can be any of the retarder control devices provided in the above embodiments and achieve the corresponding functions, which will not be elaborated further here.

[0053] Preferably, the vehicle may further include an electronic water pump, and the controller in the retarder control device is further configured to control the flow rate of the electronic water pump to increase if the engine speed is less than or equal to a first speed.

[0054] Fourthly, embodiments of this application also provide a readable storage medium.

[0055] The present application has a readable storage medium storing a retarder control program, wherein when the retarder control program is executed by a processor, it implements the steps of the retarder control method as described above.

[0056] The method implemented when the retarder control program is executed can be referred to in various embodiments of the retarder control method of this application, and will not be repeated here.

[0057] It should be noted that the sequence numbers of the embodiments in this application are for descriptive purposes only and do not represent the superiority or inferiority of the embodiments.

[0058] The terms "comprising" and "having," and any variations thereof, in the specification, claims, and accompanying drawings of this application are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or apparatus that includes a series of steps or units is not limited to the listed steps or units, but may optionally include steps or units not listed, or may optionally include other steps or units inherent to such process, method, product, or apparatus. The terms "first," "second," and "third," etc., are used to distinguish different objects, etc., and do not indicate a sequence, nor do they limit "first," "second," and "third" to different types.

[0059] In the description of the embodiments of this application, terms such as "exemplary," "for example," or "for instance" are used to indicate examples, illustrations, or explanations. Any embodiment or design described as "exemplary," "for example," or "for instance" in the embodiments of this application should not be construed as being more preferred or advantageous than other embodiments or designs. Specifically, the use of terms such as "exemplary," "for example," or "for instance" is intended to present the relevant concepts in a concrete manner.

[0060] In the description of the embodiments of this application, unless otherwise stated, " / " means "or". For example, A / B can mean A or B. The "and / or" in the text is merely a description of the relationship between related objects, indicating that there can be three relationships. For example, A and / or B can mean: A exists alone, A and B exist simultaneously, and B exists alone. In addition, in the description of the embodiments of this application, "multiple" means two or more.

[0061] In some processes described in the embodiments of this application, multiple operations or steps are included in a specific order. However, it should be understood that these operations or steps may not be executed in the order they appear in the embodiments of this application, or they may be executed in parallel. The sequence number of the operation is only used to distinguish different operations, and the sequence number itself does not represent any execution order. In addition, these processes may include more or fewer operations, and these operations or steps may be executed sequentially or in parallel, and these operations or steps may be combined.

[0062] Through the above description of the embodiments, those skilled in the art can clearly understand that the methods of the above embodiments can be implemented by means of software plus necessary general-purpose hardware platforms. Of course, they can also be implemented by hardware, but in many cases the former is a better implementation method. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, can be embodied in the form of a software product. This computer software product is stored in a storage medium (such as ROM / RAM, magnetic disk, optical disk) as described above, and includes several instructions to cause a terminal device to execute the methods described in the various embodiments of this application.

[0063] The above are merely preferred embodiments of this application and do not limit the patent scope of this application. Any equivalent structural or procedural transformations made using the content of this application's specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this application.

Claims

1. A retarder control method, characterized in that, The retarder control method includes: The maximum output torque of the retarder is limited according to the engine speed range in which the engine speed is located; The torque limiting oil temperature threshold of the retarder is adjusted according to the engine speed range.

2. The retarder control method as described in claim 1, characterized in that, The method of limiting the maximum output torque of the retarder in the current speed range based on the engine speed range includes: If the engine speed is less than or equal to the first speed, the output torque of the retarder is less than or equal to the first output torque. If the engine speed is greater than the first speed and less than or equal to the second speed, then the output torque of the retarder is less than or equal to the second output torque; wherein the second output torque is greater than the first output torque.

3. The retarder control method as described in claim 2, characterized in that, If the engine speed is greater than the second speed, the output torque of the retarder will not be limited.

4. The retarder control method as described in claim 2, characterized in that, If the engine speed increases to a level greater than the second speed, then after the engine speed decreases to a level less than the third speed, the output torque of the retarder is less than or equal to the second output torque; wherein the third speed is less than the second speed but greater than the first speed.

5. The retarder control method as described in claim 2, characterized in that, If the engine speed is less than or equal to the first speed, the flow rate of the electronic water pump will be increased.

6. The retarder control method as described in claim 1, characterized in that, The adjustment of the retarder's torque-limiting oil temperature threshold based on the engine speed range includes: If the engine speed is less than or equal to the first speed, the torque limiting oil temperature threshold of the retarder is adjusted to the first temperature threshold, and the retarder is set to stop working when the oil temperature reaches the second temperature threshold; wherein, the second temperature threshold is greater than the first temperature threshold. If the engine speed is greater than the first speed and less than or equal to the second speed, the torque limiting oil temperature threshold of the retarder is adjusted to the third temperature threshold, and the retarder is set to stop working when the oil temperature reaches the fourth temperature threshold; wherein, the third temperature threshold is greater than the first temperature threshold, the second temperature threshold is greater than the third temperature threshold, and the fourth temperature threshold is greater than the second temperature threshold.

7. The retarder control method as described in claim 6, characterized in that, If the engine speed is greater than the second speed, the torque limiting oil temperature threshold of the retarder will be adjusted to the third temperature threshold, and the retarder will be set to stop working when the oil temperature reaches the fifth temperature threshold; wherein, the fifth temperature threshold is greater than the fourth temperature threshold.

8. A retarder control device, characterized in that, The retarder control device includes: The controller is used to limit the maximum output torque of the retarder in the current speed range according to the engine speed range; and to adjust the torque limiting oil temperature threshold of the retarder according to the engine speed range.

9. A vehicle, characterized in that, The vehicle is equipped with the retarder control device as described in claim 8.

10. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores a retarder control program, wherein when the retarder control program is executed by a processor, it implements the steps of the retarder control method as described in any one of claims 1 to 7.

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