Method, device, equipment and vehicle for recycling engine waste heat after vehicle parking

Abstract

The present invention provides a method, device, equipment and vehicle for recycling engine waste heat after a vehicle is parked. When the engine is turned off and the battery pack is higher than a first heating temperature, the battery pack has no heating demand and the engine circuit cannot effectively heat the heat recovery device, the method continues to judge whether the temperature of the heat recovery device is lower than the engine temperature. When the temperature of the heat recovery device is lower than the engine temperature, the method judges whether the battery pack temperature is higher than a second preset temperature. When it is lower than the second preset temperature, the engine circuit is used to heat the battery pack. Using the engine waste heat to heat the battery pack allows the battery pack to quickly reach the optimal operating temperature, thereby improving the output efficiency of the battery pack, reducing the waste of heat resources, and also improving the performance of the battery pack.

Description

Technical Field

[0001] The present invention relates to the field of vehicle control technology, and in particular to a method, device, equipment and vehicle for recycling waste heat from an engine after the vehicle is parked. Background Art

[0002] The current automotive industry is committed to researching ways to reduce vehicle energy consumption to adapt to the increasingly severe energy crisis. This includes developing new energy vehicles and adopting new technologies, but the costs are often high.

[0003] The reduction in the range of pure electric vehicles in winter has always been a problem that has troubled OEMs. The energy for heating the battery and the passenger compartment comes from the battery, making the limited energy storage even more stretched. Therefore, how to improve the energy utilization rate of the battery and passenger compartment heating has become a topic that engineers have to tackle, so that the vehicle can have a longer range and be more competitive when the power is equivalent.

[0004] Efficient heating of batteries, utilization of waste heat from motors, utilization and collection of waste heat from engines, and application of heat pump technology, these energy-saving technologies and technologies that facilitate customer experience all play a positive role in the energy consumption of the entire vehicle.

[0005] For existing hybrid models, the engine's waste heat is only used to heat the crew cabin when the engine is working. A few technologies use the engine to heat the battery, but after the engine stops, the waste heat of the engine itself will also be wasted. How to make full use of this wasted heat to improve vehicle performance is one of the topics that technicians in this field are constantly studying. Summary of the Invention

[0006] In view of this, an embodiment of the present invention provides a method, device, equipment and vehicle for recycling engine waste heat after the vehicle is parked, so as to realize the recovery and reuse of engine waste heat. Through this engine waste heat, the battery pack temperature is increased so that the battery pack temperature is closer to the optimal operating temperature.

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

[0008] A method for recycling waste heat from an engine after a vehicle is parked, comprising:

[0009] When the engine enters the shutdown state from the start state, determining whether the battery pack temperature is higher than the first heating temperature;

[0010] When the battery pack temperature is higher than a first heating temperature, determining whether the engine can heat a heat recovery device, the heat recovery device being used to recover heat from the vehicle;

[0011] When the engine is unable to heat the heat recovery device, determining whether the temperature of the heat recovery device is greater than the engine temperature;

[0012] When the temperature of the heat recovery device is lower than the engine temperature, determining whether the battery pack temperature is lower than a second heating temperature, the second heating temperature being higher than the first heating temperature;

[0013] When the battery pack temperature is lower than the second heating temperature, the engine circuit is controlled to heat the battery pack.

[0014] Optionally, in the above-mentioned method for reusing engine waste heat after the vehicle is parked, when the temperature of the battery pack is lower than the first heating temperature, the engine circuit is controlled to heat the battery pack.

[0015] Optionally, in the above method for recycling waste heat from an engine after a vehicle stops, when the temperature of the heat recovery device is greater than the engine temperature, the method further includes:

[0016] determining whether the battery pack temperature is lower than a third heating temperature, the third heating temperature being greater than the second heating temperature;

[0017] When the temperature of the battery pack is lower than a third heating temperature, the heat recovery device is used to heat the battery pack.

[0018] Optionally, in the above method for recycling waste heat from an engine after a vehicle is parked, when the battery pack is heated, the method further includes:

[0019] Determining whether the battery pack temperature reaches a target temperature;

[0020] Determining whether the fluctuation amplitude of the battery pack temperature is within a target range;

[0021] When the temperature of the battery pack reaches the target temperature or the fluctuation range is within the target range, heating of the battery pack is stopped.

[0022] Optionally, in the above method for reusing engine waste heat after a vehicle is parked, after determining that the battery pack temperature is lower than the second heating temperature and before controlling the engine circuit to heat the battery pack, the method further includes:

[0023] Determining whether the engine water temperature is greater than a preset temperature;

[0024] When the engine water temperature is greater than the preset temperature, the subsequent steps are continued.

[0025] Optionally, in the above method for reusing engine waste heat after a vehicle stops, after the engine enters a shutdown state from a started state, and before determining whether the battery pack temperature is higher than the first heating temperature, the method further includes:

[0026] Determine whether the current state of the vehicle meets the battery pack heating conditions. If the battery pack heating conditions are met, continue to execute subsequent steps.

[0027] Optionally, in the above method for reusing engine waste heat after a vehicle is parked, determining whether the current state of the vehicle meets the battery pack heating conditions includes:

[0028] Determine whether the vehicle's ambient temperature is greater than a preset ambient temperature;

[0029] And / or, determining whether the remaining power of the battery pack is greater than a preset remaining power.

[0030] A device for recycling waste heat from an engine after a vehicle stops, comprising:

[0031] An engine status monitoring unit is used to detect whether the engine has entered a shutdown state from a start state;

[0032] a first determining unit, configured to determine whether a battery pack temperature is higher than a first heating temperature when the engine enters an ignition-off state from an on state;

[0033] a second judgment unit, configured to judge whether the engine can heat a heat recovery device when the battery pack temperature is higher than a first heating temperature, the heat recovery device being configured to recover heat from the vehicle;

[0034] a third judgment unit, configured to judge whether the temperature of the heat recovery device is greater than the engine temperature when the engine is unable to heat the heat recovery device, wherein the heat recovery device is configured to recover heat from the vehicle;

[0035] The fourth judgment unit is used to judge whether the battery pack temperature is lower than a second heating temperature when the temperature of the heat recovery device is lower than the engine temperature, and the second heating temperature is greater than the first heating temperature. When the battery pack temperature is lower than the second heating temperature, the engine circuit is controlled to heat the battery pack.

[0036] A device for recycling waste heat from an engine after a vehicle is parked, comprising a memory and a processor;

[0037] The memory is used to store programs;

[0038] The processor is used to execute the program to implement each step of the method for recycling engine waste heat after the vehicle is parked as described in any one of the above.

[0039] A vehicle is provided with the above-mentioned device for recycling waste heat from an engine after the vehicle is parked.

[0040] Based on the above technical solution, the above solution provided by the embodiment of the present invention is that when the engine is turned off and the battery pack temperature is higher than the first heating temperature, the battery pack has no heating demand and the engine circuit cannot effectively heat the heat recovery device, it continues to determine whether the temperature of the heat recovery device is lower than the engine temperature. When the temperature of the heat recovery device is lower than the engine temperature, it determines whether the battery pack temperature is higher than the second preset temperature. When it is lower than the second preset temperature, the engine circuit is used to heat the battery pack. Using the engine waste heat to heat the battery pack allows the battery pack to quickly reach the optimal operating temperature, thereby improving the output efficiency of the battery pack, reducing the waste of heat resources, and also improving the performance of the battery pack. Compared with the existing technology, this application makes full use of the waste heat after the engine is turned off. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are merely embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying any creative work.

[0042] Figure 1 This is a flow chart of a method for reusing waste heat from an engine after a vehicle is parked, as disclosed in an embodiment of the present application;

[0043] Figure 2 This is a flow chart of a method for reusing waste heat from an engine after a vehicle is parked, disclosed in another embodiment of the present application;

[0044] Figure 3 This is a flow chart of a method for reusing waste heat from an engine after a vehicle is parked, disclosed in another embodiment of the present application;

[0045] Figure 4 This is a flow chart of a method for reusing waste heat from an engine after a vehicle is parked, disclosed in another embodiment of the present application;

[0046] Figure 5 This is a flow chart of a method for reusing waste heat from an engine after a vehicle is parked, disclosed in another embodiment of the present application;

[0047] Figure 6 This is a schematic diagram of the structure of the device for recycling waste heat from an engine after a vehicle is parked, as disclosed in an embodiment of the present application;

[0048] Figure 7 This is a schematic diagram of the structure of the device for recycling waste heat from the engine after a vehicle is parked, as disclosed in an embodiment of the present application. DETAILED DESCRIPTION

[0049] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0050] In this solution, in order to improve the utilization rate of recovered heat and enhance vehicle performance, the present application discloses a method for recycling engine waste heat after the vehicle is parked. In this solution, the engine waste heat after the vehicle engine is turned off is recovered and reused, and the engine waste heat is used to heat the battery pack so that the battery pack can quickly reach the optimal operating temperature. While reducing the waste of heat resources, the output efficiency of the battery pack is improved and the battery pack performance is improved.

[0051] Specifically, this application discloses a method for recycling waste heat from an engine after a vehicle is parked. Figure 1 , including steps S101-S105.

[0052] Step S101: When the engine enters the shutdown state from the start state, determine whether the battery pack temperature is higher than the first heating temperature.

[0053] In this step, the engine status is monitored in real time. When the engine is operating, it releases heat, resulting in a high temperature over time. When the engine switches from operating to off, a significant amount of heat accumulates. If this heat is not processed, it will automatically dissipate into the air. Of course, if the engine has been off for a predetermined period (e.g., 30 minutes), the engine temperature is naturally low, and there is no heat to be recovered, so no subsequent actions are required.

[0054] In this solution, in order to be able to timely and fully utilize this heat, it is necessary to detect the operating status of the engine. When it is detected that the engine has entered the off state from the starting state, it indicates that the engine has a large amount of heat that can be utilized. At this time, it is determined whether the battery pack is in a low-temperature state. When the battery pack is in a low-temperature state, step S102 is continued. In this solution, whether the battery pack is in a low-temperature state can be determined by comparing the battery pack temperature with a first heating temperature. Specifically, the first heating temperature can be pre-set, and the value of the first heating temperature can be 5°C, 10°C, or 15°C. The collected battery pack temperature is compared with the first heating temperature. When it is determined that the battery pack temperature is less than the first heating temperature, it indicates that the battery pack is in a low-temperature state and there is a need for emergency heating. The battery pack needs to be heated.

[0055] The heat recovery device is used to recover heat from the vehicle. The recovered heat may include but is not limited to the heat from the engine exhaust. The heat recovery device may be in the form of a heat collection tank or other equipment that can store thermal energy, which can heat the target object through the high-temperature medium stored internally.

[0056] Step S102: When the battery pack temperature is higher than the first heating temperature, determining whether the engine can heat the heat recovery device;

[0057] In this step, when the battery pack temperature is greater than the first heating temperature, the battery pack does not need emergency heating. At this time, the direction of reuse of the engine waste heat can be divided into three directions. The first is to heat the heat recovery device, the second is to respond to the obtained heating request, and the third is to continue to heat the battery pack. In this solution, responding to the obtained heating request has the highest priority, and continuing to heat the battery pack has the lowest priority. That is, if a heating request is obtained and the engine waste heat can effectively respond to the heating request, the engine circuit is controlled to respond to the heating request. When judging whether the engine waste heat can effectively respond to the heating request, it can be judged by comparing the engine temperature with the target temperature of the heating request. When the engine temperature is greater than the target temperature of the heating request, and the difference between the two is greater than the preset temperature difference, for example, the preset temperature difference can be 5°C, 10°C or 15°C, it indicates that the engine waste heat can effectively respond to the heating request. At this time, the heating request is responded to first. When the heating request is not obtained in this process, judge whether the engine can heat the heat recovery device, see Figure 2If the engine can heat the heat recovery device, the engine is controlled to heat the heat recovery device. When judging whether the engine can heat the heat recovery device, it can be judged by judging whether the temperature difference between the two is greater than a preset temperature difference. If the engine temperature is lower than the heat recovery device, if the engine is controlled to perform heat exchange with the heat recovery device, since the engine is the one with the lower temperature, the engine cannot transfer heat to the heat recovery device. At this time, the engine cannot heat the heat recovery device. If the engine temperature is higher than the heat recovery device, but the temperature difference between the two is less than the preset temperature difference, since the temperature difference between the two is low, if the engine is controlled to perform heat exchange with the heat recovery device, the heating effect on the heat recovery device is limited. Moreover, even during the heat exchange process, due to the flow of the heat exchange medium in the pipeline, a certain amount of heat will be dissipated, which may cause the temperature of the heat recovery device to drop instead of rise. At this time, it can also be considered that the engine cannot heat the heat recovery device. If the engine temperature is higher than that of the heat recovery device, and the temperature difference between the two is greater than a preset temperature difference, in this state, if the engine is controlled to transfer a portion of its heat to the heat recovery device during heat exchange with the heat recovery device, the heat recovery device is in a heated state, indicating that the engine can heat the heat recovery device. At this time, the water pump in the heat recovery device or the engine water pump is controlled to operate at a constant speed or gradually increase its speed. At the same time, the solenoid valve in the heat recovery pipeline between the heat recovery device and the engine is controlled to gradually open to its maximum opening. Driven by the water pump, the low-temperature medium in the heat recovery device flows through the heat recovery pipeline to the engine, exchanges heat with the engine, absorbs the engine's heat, and then flows back to the heat recovery device until the engine can no longer effectively heat the heat recovery device, thereby achieving the purpose of using the engine to heat the heat recovery device. Of course, when using the engine to heat the heat recovery device, the high-temperature medium in the engine circuit can also be driven by the water pump to flow to the heat recovery device, exchange heat at the heat recovery device, and then flow back to the engine circuit after the exchange is completed. This method can also achieve the purpose of the engine heating the heat recovery device. When the engine cannot heat the heat recovery device, it can be further determined whether the battery pack needs to continue heating up, and step S103 is executed.

[0058] Step S103: Determine whether the temperature of the heat recovery device is greater than the engine temperature, wherein the heat recovery device is used to recover heat from the vehicle.

[0059] In this solution, the main purpose is to select the heat source, that is, whether to use the engine circuit or the heat recovery device to heat the battery pack. In this solution, the one with higher temperature will be preferred as the heat source. Therefore, it is necessary to determine in advance whether the temperature of the heat recovery device is greater than the engine temperature.

[0060] Step S104: When the temperature of the heat recovery device is lower than the engine temperature, it is determined whether the battery pack temperature is lower than a second heating temperature, and the second heating temperature is higher than the first heating temperature.

[0061] Generally speaking, when the engine is just turned off, its temperature is higher than the temperature of the heat recovery device, and at this time the temperature of the battery pack is in a relatively low state. As time goes on, the engine temperature gradually decreases and the temperature of the battery pack gradually increases. In this process, the battery pack has a certain temperature increase requirement. During this time period, due to the high engine temperature, the heating speed of the engine circuit is higher than the heating speed of the heat recovery device. Therefore, the engine circuit is preferentially used to heat the battery pack. That is, in this step, when the temperature of the heat recovery device is lower than the engine temperature, it indicates that the engine waste heat is relatively high. At this time, the engine circuit is preferentially used to heat the battery pack. First, determine whether the battery pack temperature is lower than the second heating temperature. The value of the second heating temperature is higher than the first heating temperature and lower than the third heating temperature described below. Its specific value can be 20°C, 25°C, 30°C or others. As long as the battery pack temperature is lower than the second heating temperature, the engine circuit can be used to heat the battery pack. Of course, in certain special circumstances, for example, when the weather is hot and the engine has just been turned off, the temperature of the battery pack itself may have exceeded the second heating temperature. At this time, even if the engine temperature is higher than the heat recovery device, there is no need to use the engine circuit to heat the battery pack. In this case, after the battery pack is running, the temperature of the energy reaction itself will rise rapidly, so there is no need to use the engine for additional heating.

[0062] Step S105: When the battery pack temperature is lower than the second heating temperature, controlling the engine circuit to heat the battery pack.

[0063] In this step, when it is detected that the battery pack temperature is lower than the second heating temperature, it indicates that although the battery pack has a certain temperature, it is far from the optimal operating temperature corresponding to the highest working efficiency of the battery pack. It is difficult for the battery pack to quickly reach the optimal operating temperature. The battery pack still needs to be heated. Therefore, it is necessary to control the engine circuit to heat the battery pack. Figure 2If the battery pack temperature is higher than the second heating temperature, it indicates that the battery pack temperature itself is very high, and when the battery pack is working, it can quickly heat up to the optimal working temperature. At this time, the process can be ended.

[0064] In this solution, a first battery pack heating circuit can be pre-configured between the battery pack and the engine circuit. A solenoid valve is configured in the first battery pack heating circuit. The on / off state of the first battery pack heating circuit is controlled by the solenoid valve. The larger the opening of the solenoid valve, the greater the medium flow in the first battery pack heating circuit, and the faster the battery pack heats up. In this solution, when the engine circuit is controlled to heat the battery pack, the solenoid valve can be first controlled to enter an initial opening, and then the opening step of the solenoid valve can be controlled based on the temperature difference between the heat source (engine circuit or heat recovery device) and the battery pack. The larger the temperature difference, the greater the heating demand, the larger the opening step of the solenoid valve, and the shorter the time it takes for the solenoid valve to reach full opening from the initial opening. By gradually controlling the opening angle of the solenoid valve, the temperature change of the power battery does not need to be too drastic, so that the heating rate of the battery pack can be controlled.

[0065] It can be seen from the technical solutions disclosed in the above embodiments of the present application that in the above solutions, when the engine is turned off and the battery pack is higher than the first heating temperature, the battery pack has no heating demand and the engine circuit cannot effectively heat the heat recovery device, it is continued to determine whether the temperature of the heat recovery device is lower than the engine temperature. When the temperature of the heat recovery device is lower than the engine temperature, it is determined whether the battery pack temperature is greater than the second preset temperature. When it is lower than the second preset temperature, the engine circuit is used to heat the battery pack. The battery pack is heated by the waste heat of the engine so that the battery pack can quickly reach the optimal operating temperature, thereby improving the output efficiency of the battery pack, reducing the waste of heat resources, and also improving the performance of the battery pack.

[0066] In this embodiment, see Figure 2 In the above method, when step S101 determines that the battery pack temperature is lower than the first heating temperature, it indicates that the battery pack is in a low temperature state and the battery pack urgently needs to be heated. Therefore, see Figure 2 The battery pack can be heated directly using the engine circuit. When heating starts, the battery water pump or the engine water pump is first controlled to operate at a fixed speed or gradually increase the speed. Then, the solenoid valve in the first battery pack heating circuit is controlled to open gradually, and the high-temperature medium in the engine circuit is circulated to the battery pack. The battery pack absorbs the heat of the high-temperature medium flowing through it and increases its own temperature.

[0067] Here, the reason why the engine circuit can be directly selected to heat the battery pack is that the scenario corresponding to this state is usually that the engine has just been turned off and the battery pack has just started working. During this period, the temperature of the battery pack will be lower than the first heating temperature, and the engine has a high residual temperature. Therefore, the engine circuit can be directly selected to heat the battery pack, thereby achieving the battery pack temperature quickly leaving the low temperature stage.

[0068] In this embodiment, when the battery pack temperature is greater than the first heating temperature and less than the second heating temperature, before the engine circuit is used to heat the battery pack, step S1041 may be further included: determining whether the engine circuit can effectively heat the battery pack. Figure 2 In this embodiment, a preset temperature can be set in advance. The preset temperature must be higher than the second heating temperature, for example, it can be 28°C, 30°C, 32°C, etc., to determine whether the engine temperature is greater than the preset temperature. When it is greater than the preset temperature, it indicates that the engine circuit can effectively heat the battery pack. At this time, the action continues to be executed: the battery pack is heated using the engine circuit.

[0069] In this embodiment, when step S103 determines that the temperature of the heat recovery device is greater than the engine temperature, the heat recovery device can be used to heat the battery pack. When the heat recovery device is used to heat the battery, see Figure 3 The method further includes: step S1031: determining whether the battery pack temperature is lower than a third heating temperature, the third heating temperature being greater than the second heating temperature, wherein the third heating temperature is a temperature value close to the optimal operating temperature of the battery pack, but the third heating temperature is lower than the optimal operating temperature of the battery pack. When it is determined that the battery pack temperature is lower than the third heating temperature, it indicates that the battery pack has not yet reached the optimal operating temperature. At this time, a heat recovery device can be used to heat the battery pack so that the battery pack quickly reaches the optimal operating temperature. Furthermore, when a heat recovery device is used to heat the battery pack, it is also possible to pre-judge whether the heat recovery device can effectively heat the battery pack. Specifically, when the temperature of the heat recovery device is greater than the temperature of the battery pack, and the temperature difference between the two is greater than a preset temperature difference, it indicates that the heat recovery device can effectively heat the battery pack. When the heat recovery device can effectively heat the battery pack, the water pump in the heat recovery device is controlled to operate at a constant speed, and the solenoid valve in the heating pipeline between the heat recovery device and the battery pack is controlled to gradually open. Driven by the water pump in the heat recovery device, the high-temperature medium in the heat recovery device flows to the battery pack, exchanges heat with the battery pack, and flows back to the heat recovery device after the heat exchange is completed.

[0070] In the technical solution disclosed in this embodiment, during the heating process of the battery pack, the temperature of the battery pack needs to be monitored in real time. When the temperature of the battery pack has reached the target temperature (the optimal operating temperature of the battery pack) or the temperature of the battery pack is stable, the specific value of the target temperature varies with the type and specification of the battery pack. In this embodiment, the target temperature can be set to 40°C or other. When the target temperature is reached or the battery pack temperature is stable, the battery pack heating can be stopped. For details, see Figure 4 , the method may further include:

[0071] Step S401: Determine whether the battery pack temperature is lower than the target temperature.

[0072] The target temperature is a pre-set optimal operating temperature of the battery pack. When the battery pack is working, the temperature of the battery pack should not exceed this temperature. If it exceeds this temperature, the output efficiency of the battery pack may be reduced or the service life of the battery pack may be affected. Therefore, during the heating process of the battery pack, it is necessary to detect whether the battery pack temperature reaches the target temperature.

[0073] Step S402: When the battery pack temperature is lower than the target temperature, it is determined whether the fluctuation range of the battery pack temperature is within a target range in the current cycle.

[0074] In this step, considering that the reason why the battery pack temperature has not reached the target temperature may be due to the engine circuit temperature being too low or the heat exchange efficiency between the two being too low, which makes the battery pack unable to reach the target temperature, it is necessary to continue to judge the temperature of the battery pack. In this step, it will continue to judge whether the battery pack temperature has reached stability. If the battery pack temperature has reached the highest value in the current cycle, even if the battery pack is continued to be heated, it will only cause the battery pack temperature to fluctuate within a small range and will not further increase the battery pack temperature. Based on this, this step determines whether the battery pack temperature has reached the highest value by judging whether the fluctuation range of the battery pack temperature is within the target range (for example, the fluctuation range does not exceed ±2°C) within the current cycle (which can be 10 minutes or other time lengths). If it has reached the highest value, there is no point in heating the battery pack and it is necessary to stop heating the battery pack.

[0075] If the fluctuation range of the battery pack temperature is not within the target range, it indicates that the temperature of the heat collecting tank can be further increased, and the process returns to step S401 to perform the next cycle of analysis.

[0076] Step S403: When the battery pack temperature is greater than the target temperature or the fluctuation range of the battery pack temperature is within the target range, stop heating the battery pack.

[0077] In this step, when it is detected that the battery pack temperature has reached the target temperature or the battery pack temperature has reached the maximum temperature (in the current cycle, the fluctuation range of the battery pack temperature is within the target range), heating the battery pack is stopped.

[0078] In this embodiment, after the engine is turned off and before the battery pack is heated, it is also possible to pre-determine whether the current state of the vehicle meets the battery pack heating conditions. When the battery pack heating conditions are not met, there is no need to execute subsequent processes. The battery pack heating conditions can be set according to user needs. For example, determining whether the current state of the vehicle meets the battery pack heating conditions may include any one or a combination of the following three items: Figure 5 In the embodiment shown, the three items are used as the judgment conditions for judging whether the current state of the vehicle meets the battery pack heating conditions, as shown in FIG. Figure 5 , determining whether the current state of the vehicle meets the battery pack heating conditions includes:

[0079] Step S501: Determine whether the vehicle's ambient temperature is greater than a preset ambient temperature.

[0080] The preset ambient temperature value can be set to 20°C, that is, when the ambient temperature of the vehicle is less than 20°C, the engine circuit or heat recovery device can be used to heat the battery pack. When the ambient temperature of the vehicle is greater than 20°C, it indicates that the battery pack can quickly reach the optimal operating temperature without heating. At this time, the process needs to be terminated.

[0081] Step S502: Determine whether the remaining power of the battery pack is greater than a preset remaining power.

[0082] In this step, the remaining power refers to the remaining power of the battery pack. For example, the preset remaining power value can be 30% or 20%. During the execution of this solution, the reason why it is necessary to ensure that the remaining power of the battery pack is greater than the preset remaining power is to ensure that the battery pack supplies power to the small battery to avoid the small battery from feeding power when the strategy is executed.

[0083] Step S503: Determine whether the heat recovery device is in the startup state.

[0084] If the heat recovery device is not turned on, it indicates that the user does not need heat recovery. At this time, all subsequent solutions disclosed in the embodiments of this application cannot be executed. Of course, at this time, the solution of using the engine circuit to heat the battery pack in the above solution can be executed.

[0085] It can be seen from the above scheme that a vehicle that applies the technical solution disclosed in the above embodiment of the present application can more effectively recycle and utilize the engine waste heat by determining the temperature of the heat recovery device, the engine temperature, and the battery pack temperature after the engine is turned off, thereby avoiding waste of the engine circuit or engine waste heat, saving heating energy consumption, and improving vehicle performance.

[0086] In this embodiment, corresponding to the above method, a device for recycling waste heat from an engine after a vehicle is parked is also disclosed. For the specific working contents of each unit in the device, please refer to the contents of the above method embodiment.

[0087] The following describes a device for recycling waste heat from an engine after a vehicle is parked, provided in an embodiment of the present invention. The device for recycling waste heat from an engine after a vehicle is parked described below and the method for recycling waste heat from an engine after a vehicle is parked described above can be referred to in correspondence with each other.

[0088] See also Figure 6 , the apparatus may include:

[0089] The engine state monitoring unit 10 is used to detect whether the engine enters the shutdown state from the start state;

[0090] The first determination unit 20 corresponds to step S101 in the above method and is used to determine whether the battery pack temperature is higher than the first heating temperature when the engine enters the shutdown state from the start state;

[0091] The second judgment unit 30 corresponds to step S102 in the above method and is used to judge whether the engine can heat the heat recovery device when the battery pack temperature is higher than the first heating temperature, wherein the heat recovery device is used to recover heat from the vehicle;

[0092] The third judgment unit 40 corresponds to step S103 in the above method and is used to judge whether the temperature of the heat recovery device is greater than the engine temperature when the engine is unable to heat the heat recovery device, wherein the heat recovery device is used to recover heat from the vehicle;

[0093] The fourth judgment unit 50 corresponds to step S104 and step S105 in the above method, and is used to judge whether the battery pack temperature is lower than the second heating temperature when the temperature of the heat recovery device is lower than the engine temperature, and the second heating temperature is greater than the first heating temperature. When the battery pack temperature is lower than the second heating temperature, the engine circuit is controlled to heat the battery pack.

[0094] Corresponding to the above method, the present application also discloses a device for recycling waste heat from the engine after the vehicle is parked. Figure 7The hardware structure diagram of the device for recycling waste heat from the engine after parking of a vehicle provided by the embodiment of the present invention can be loaded into the on-board computer. Figure 7 As shown, the device 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;

[0095] In the embodiment of the present invention, the number of the processor 100, the communication interface 200, the memory 300, and the communication bus 400 is at least one, and the processor 100, the communication interface 200, and the memory 300 communicate with each other through the communication bus 400; obviously, Figure 7 The communication connections shown for the processor 100, communication interface 200, memory 300, and communication bus 400 are merely optional;

[0096] Optionally, the communication interface 200 may be an interface of a communication module, such as an interface of a GSM module;

[0097] The processor 100 may be a central processing unit (CPU), or an application-specific integrated circuit (ASIC), or one or more integrated circuits configured to implement the embodiments of the present invention.

[0098] The memory 300 may include a high-speed RAM memory, and may also include a non-volatile memory (non-volatile memory), such as at least one disk memory.

[0099] The processor 100 is specifically configured to execute the steps of the method for reusing engine waste heat after a vehicle is parked, as disclosed in any one of the above embodiments of the present application. For example, the processor is configured to:

[0100] When the engine enters the shutdown state from the start state, determining whether the battery pack temperature is higher than the first heating temperature;

[0101] When the battery pack temperature is higher than a first heating temperature, determining whether the engine can heat a heat recovery device, the heat recovery device being used to recover heat from the vehicle;

[0102] When the engine is unable to heat the heat recovery device, determining whether the temperature of the heat recovery device is greater than the engine temperature;

[0103] When the temperature of the heat recovery device is lower than the engine temperature, determining whether the battery pack temperature is lower than a second heating temperature, the second heating temperature being higher than the first heating temperature;

[0104] When the battery pack temperature is lower than the second heating temperature, the engine circuit is controlled to heat the battery pack.

[0105] Corresponding to the above-mentioned device, the present application also discloses a vehicle, which can be applied with the above-mentioned engine waste heat recycling device after the vehicle is parked, and the vehicle can be a hybrid vehicle.

[0106] For the convenience of description, the above system is described as being divided into various modules according to their functions. Of course, when implementing the present invention, the functions of each module can be implemented in the same or multiple software and / or hardware.

[0107] Each embodiment in this specification is described in a progressive manner. The same or similar parts between the embodiments can be referred to each other. Each embodiment focuses on 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. For relevant parts, refer to the partial description of the method embodiment. The system and system embodiments described above are merely schematic, wherein the units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they may be located in one place, or they may be distributed on multiple network units. Some or all of the modules can be selected according to actual needs to achieve the purpose of the solution of this embodiment. A person of ordinary skill in the art can understand and implement it without expending creative work.

[0108] Professionals may further appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, computer software, or a combination of the two. In order to clearly illustrate the interchangeability of hardware and software, the above description has generally described the components and steps of each example according to their functions. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professionals and technicians may use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of the present invention.

[0109] The steps of the methods or algorithms described in conjunction with the embodiments disclosed herein may be implemented directly using hardware, a software module executed by a processor, or a combination of the two. The software module may be placed in random access memory (RAM), internal memory, read-only memory (ROM), electrically programmable ROM, electrically erasable programmable ROM, registers, a hard disk, a removable disk, a CD-ROM, or any other form of storage medium known in the art.

[0110] It should also be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or elements inherent to such process, method, article, or device. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of additional identical elements in the process, method, article, or device comprising the element.

[0111] The above description of the disclosed embodiments is intended to enable one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be readily apparent to one 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 present invention. Therefore, the present invention is not limited to the embodiments shown herein but is intended to conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A method for recycling waste heat from an engine after a vehicle stops, characterized in that: include: When the engine enters the shutdown state from the start state, determining whether the battery pack temperature is higher than the first heating temperature; When the battery pack temperature is higher than a first heating temperature, determining whether the engine can heat a heat recovery device, the heat recovery device being used to recover heat from the vehicle; When the engine is unable to heat the heat recovery device, determining whether the temperature of the heat recovery device is greater than the engine temperature; When the temperature of the heat recovery device is lower than the engine temperature, determining whether the battery pack temperature is lower than a second heating temperature, the second heating temperature being higher than the first heating temperature; When the temperature of the battery pack is lower than the second heating temperature, controlling the engine circuit to heat the battery pack; When the temperature of the battery pack is lower than the first heating temperature, controlling the engine circuit to heat the battery pack; When the temperature of the heat recovery device is greater than the engine temperature, the method further includes: determining whether the battery pack temperature is lower than a third heating temperature, the third heating temperature being greater than the second heating temperature; When the temperature of the battery pack is lower than a third heating temperature, the heat recovery device is used to heat the battery pack.

2. The method for recycling waste heat from an engine after a vehicle is parked according to claim 1, characterized in that: When the battery pack is heated, it also includes: Determining whether the battery pack temperature reaches a target temperature; Determining whether the fluctuation amplitude of the battery pack temperature is within a target range; When the temperature of the battery pack reaches the target temperature or the fluctuation range is within the target range, heating of the battery pack is stopped.

3. The method for recycling waste heat from an engine after a vehicle stops according to claim 1, characterized in that: After determining that the battery pack temperature is lower than the second heating temperature and before controlling the engine circuit to heat the battery pack, the method further includes: Determining whether the engine water temperature is greater than a preset temperature; When the engine water temperature is greater than the preset temperature, the subsequent steps are continued.

4. The method for recycling waste heat from an engine after a vehicle stops according to claim 1, characterized in that: After the engine enters the shutdown state from the start state, before determining whether the battery pack temperature is higher than the first heating temperature, the method further includes: Determine whether the current state of the vehicle meets the battery pack heating conditions. If the battery pack heating conditions are met, continue to execute subsequent steps.

5. The method for recycling waste heat from an engine after a vehicle stops according to claim 4, characterized in that: Determining whether the vehicle's current state meets the battery pack heating conditions includes: Determine whether the vehicle's ambient temperature is greater than a preset ambient temperature; And / or, determining whether the remaining power of the battery pack is greater than a preset remaining power.

6. A device for recycling waste heat from an engine after a vehicle stops, characterized in that: include: An engine status monitoring unit is used to detect whether the engine has entered a shutdown state from a start state; a first determining unit, configured to determine whether a battery pack temperature is higher than a first heating temperature when the engine enters an ignition-off state from an on state; a second judgment unit, configured to judge whether the engine can heat a heat recovery device when the battery pack temperature is higher than a first heating temperature, the heat recovery device being configured to recover heat from the vehicle; a third judgment unit, configured to judge whether the temperature of the heat recovery device is greater than the engine temperature when the engine is unable to heat the heat recovery device, wherein the heat recovery device is configured to recover heat from the vehicle; a fourth determining unit, configured to, when the temperature of the heat recovery device is lower than the engine temperature, determine whether the battery pack temperature is lower than a second heating temperature, the second heating temperature being higher than the first heating temperature, and, when the battery pack temperature is lower than the second heating temperature, control the engine circuit to heat the battery pack; The device is also used to: when the battery pack temperature is lower than the first heating temperature, control the engine circuit to heat the battery pack; when the temperature of the heat recovery device is greater than the engine temperature, determine whether the battery pack temperature is lower than a third heating temperature, and the third heating temperature is greater than the second heating temperature; when the battery pack temperature is lower than the third heating temperature, use the heat recovery device to heat the battery pack.

7. A device for recycling waste heat from an engine after a vehicle stops, characterized in that: including memory and processor; The memory is used to store programs; The processor is used to execute the program to implement the various steps of the method for recycling engine waste heat after vehicle parking as described in any one of claims 1 to 5.

8. A vehicle, characterized in that: The device for recycling waste heat from an engine after a vehicle is parked as claimed in claim 7 is used.

Images