Engine waste heat recovery method and device for vehicle, vehicle and storage medium

Abstract

The present application relates to the technical field of vehicle thermal management control, in particular to an engine waste heat recovery method and device for a vehicle, the vehicle and a storage medium, wherein the method comprises: judging whether the passenger compartment and / or the power battery of the current vehicle has a heating demand; if the passenger compartment and / or the power battery has a heating demand, detecting the current state of charge (SOC) of the power battery and determining the charge interval in which the current SOC is located; determining the waste heat recovery strategy of the current vehicle according to the charge interval and / or the current road condition in which the current vehicle is located, and performing the engine waste heat recovery action according to the waste heat recovery strategy. Thus, the problem that the temperature of the passenger compartment fluctuates after the vehicle range extender is restarted after being stopped is solved, thereby improving the user experience.

Description

Vehicle engine waste heat recovery methods, devices, vehicles and storage media Technical Field

[0001] This invention relates to the field of vehicle thermal management control, and specifically to a method, device, vehicle, and storage medium for recovering waste heat from a vehicle engine. Background Technology

[0002] Currently, the operating and shutdown times of range-extended vehicles are not fixed because the operating and shutdown times of the range extender engine are affected by multiple factors such as the SOC (State of Charge) of the power battery, vehicle speed, and the discharge power of the power battery. However, the passenger compartment heating function requires a stable heat source.

[0003] Among related technologies, patent [CN201710524035.9] proposes a thermal management system and control method for range-extended electric vehicles, including an engine cycle subsystem, a drive motor cycle subsystem, and an air conditioning refrigeration cycle subsystem. The engine cycle subsystem includes a range-extending engine, a circulating water pump I, a radiator I, a cooling fan, a solenoid valve I, a radiator II, a blower, a PTC (Positive Temperature Coefficient) heater, a solenoid valve II, and a battery pack. The drive motor cycle subsystem includes a circulating water pump II, an inverter, a drive motor, a range-extending generator, and a radiator III. The air conditioning refrigeration cycle subsystem includes a compressor, a condenser, a solenoid valve III, a battery pack, an evaporator, and a blower, which is safer, more reliable, and has better thermal management performance.

[0004] However, this method only uses the engine and PTC for heating the power battery and cooling the passenger compartment, but does not utilize the waste heat of the motor and the heat pump. The energy utilization rate is low, resulting in high power consumption in pure electric mode, low driving range, and long charging time at low temperatures. It urgently needs to be improved. Summary of the Invention

[0005] One objective of this invention is to provide a method for recovering waste heat from a vehicle engine to solve the problem of temperature fluctuations in the passenger compartment caused by restarting the PTC after the vehicle's range extender has stopped; a second objective is to provide a device for recovering waste heat from a vehicle engine; a third objective is to provide a vehicle; and a fourth objective is to provide a computer storage medium.

[0006] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0007] A method for recovering waste heat from a vehicle engine includes the following steps:

[0008] Determine whether the current vehicle's passenger compartment and / or power battery require heating;

[0009] If the passenger compartment and / or the power battery have the heating requirement, then the current state of charge (SOC) of the power battery is detected, and the charge range of the current SOC is determined; and

[0010] The waste heat recovery strategy for the current vehicle is determined based on the charge range and / or the current road conditions of the current vehicle, and the engine waste heat recovery action is performed according to the waste heat recovery strategy.

[0011] Based on the above technical means, this invention activates the PTC 10 seconds before the vehicle's range extender stops operating, according to the different SOC of the vehicle's power battery and combined with the vehicle's map navigation information. This allows the PTC temperature to reach the required temperature for heating the passenger compartment or the power battery in advance, avoiding the situation where the passenger compartment temperature fluctuates after the range extender stops and the PTC is restarted, thereby improving the user experience.

[0012] Furthermore, the charge interval includes a first to a third preset charge interval, wherein,

[0013] The first preset charge range is defined as: the current SOC is less than the first preset value;

[0014] The second preset charge range is defined as follows: the current SOC is greater than or equal to the first preset value, and the current SOC is less than the second preset value.

[0015] The third preset charge range is: the current SOC is greater than or equal to the second preset value.

[0016] Based on the above technical means, the present invention divides the different SOCs of the vehicle's power battery into different intervals, which facilitates the determination of the vehicle's waste heat recovery strategy according to different intervals and enhances the user experience.

[0017] Further, the charge range is the first preset range, and the step of determining the waste heat recovery strategy of the current vehicle based on the charge range and / or the current road conditions of the current vehicle, and performing engine waste heat recovery actions according to the waste heat recovery strategy, includes:

[0018] Control the range extender of the current vehicle to a preset working state and obtain the engine coolant temperature of the current vehicle;

[0019] If the water temperature is higher than the preset temperature, the passenger compartment and / or the power battery will be heated by the waste heat from the range extender engine.

[0020] Based on the above technical means, the present invention starts the range extender to charge the power battery when the SOC of the vehicle power battery meets the first range state, and uses the waste heat of the engine of the range extender to heat the passenger compartment and / or the power battery when the engine water temperature meets certain conditions, so as to prevent the temperature fluctuation of the passenger compartment and improve the user experience.

[0021] Furthermore, after controlling the current vehicle's range extender to be in the preset operating state, the method further includes:

[0022] Determine whether the slope of the road ahead of the current vehicle is greater than a preset slope value, and whether the length of the road ahead is greater than a preset length value;

[0023] If the slope of the road ahead is greater than the preset slope value and the length of the road ahead is greater than the preset length value, then the first time it takes for the current vehicle to reach the road ahead is calculated based on the navigation information of the current vehicle. When the first time meets the preset time, the heater of the current vehicle is turned on, and the range extender is turned off after the preset time.

[0024] If the slope of the road ahead is less than or equal to the preset slope value, or the length of the road ahead is less than or equal to the preset length value, then the passenger compartment and / or the power battery will be heated by the waste heat of the range extender engine.

[0025] Based on the above-mentioned technical means, the present invention activates the vehicle's heater after a first period of time when the current vehicle has reached the road ahead, and when the first period of time meets a preset time, thereby avoiding temperature fluctuations in the passenger compartment when the range extender is turned off on long downhill sections and improving the user experience.

[0026] Further, the charge range is the second preset range, and the step of determining the waste heat recovery strategy of the current vehicle based on the charge range and / or the current road conditions of the current vehicle, and performing engine waste heat recovery actions according to the waste heat recovery strategy, includes:

[0027] The range extender of the current vehicle is controlled to be in a preset working state, and it is determined whether there are traffic lights or preset congestion sections on the road ahead of the current vehicle.

[0028] If the road ahead contains the traffic light or the preset congestion section, the second time it takes for the current vehicle to reach the traffic light or the preset congestion section is calculated based on the navigation information of the current vehicle. When the second time meets the preset time, the heater of the current vehicle is turned on, and the range extender is turned off after the preset time.

[0029] If there are no traffic lights or preset congested sections on the road ahead, the waste heat from the range extender engine will be used to heat the passenger compartment and / or the power battery.

[0030] Based on the above-mentioned technical means, the present invention improves the user experience by turning on the vehicle's heater after a second period of time when the current vehicle has reached the road ahead, and when the second period of time meets a preset time. This prevents the temperature fluctuation in the passenger compartment from occurring when the range extender is turned off on a long downhill section.

[0031] Further, the charge range is the third preset range, and the step of determining the waste heat recovery strategy of the current vehicle based on the charge range and / or the current road conditions of the current vehicle, and performing engine waste heat recovery actions according to the waste heat recovery strategy, includes:

[0032] The range extender of the current vehicle is kept in an inactive state, and the current power demand of the accelerator pedal is detected.

[0033] If the current power demand is less than the power battery power, then the controller is placed in the preset working state.

[0034] Based on the above technical means, the present invention reduces energy consumption by not activating the range extender when the vehicle's power battery SOC meets the third range state, and only activating the range extender when the current power demand of the accelerator pedal is less than the power of the power battery.

[0035] Furthermore, after determining whether the current vehicle's passenger compartment and / or power battery have the heating requirement, the method further includes:

[0036] If neither the passenger compartment nor the battery requires heating, then the engine waste heat recovery operation will not be performed.

[0037] Based on the above-mentioned technical means, the present invention can reduce energy consumption by not starting the range extender and not utilizing the waste heat of the range extender engine when there is no heating requirement in the passenger compartment and the battery.

[0038] A waste heat recovery device for a vehicle engine, comprising:

[0039] The judgment module is used to determine whether there is a heating requirement in the current vehicle's passenger compartment and / or power battery;

[0040] The determination module is configured to, if the heating requirement exists in the passenger compartment and / or the power battery, detect the current state of charge (SOC) of the power battery and determine the charge range in which the current SOC falls; and

[0041] The recovery module is used to determine the waste heat recovery strategy of the current vehicle based on the charge range and / or the current road conditions of the current vehicle, and to perform engine waste heat recovery actions according to the waste heat recovery strategy.

[0042] Furthermore, the charge interval includes a first to a third preset charge interval, wherein,

[0043] The first preset charge range is defined as: the current SOC is less than the first preset value;

[0044] The second preset charge range is defined as follows: the current SOC is greater than or equal to the first preset value, and the current SOC is less than the second preset value.

[0045] The third preset charge range is: the current SOC is greater than or equal to the second preset value.

[0046] Furthermore, the charge range is the first preset range, and the recycling module is specifically used for:

[0047] Control the range extender of the current vehicle to a preset working state and obtain the engine coolant temperature of the current vehicle;

[0048] If the water temperature is higher than the preset temperature, the passenger compartment and / or the power battery will be heated by the waste heat from the range extender engine.

[0049] Furthermore, after controlling the current vehicle's range extender to be in the preset operating state, the recovery module is also used to:

[0050] Determine whether the slope of the road ahead of the current vehicle is greater than a preset slope value, and whether the length of the road ahead is greater than a preset length value;

[0051] If the slope of the road ahead is greater than the preset slope value and the length of the road ahead is greater than the preset length value, then the first time it takes for the current vehicle to reach the road ahead is calculated based on the navigation information of the current vehicle. When the first time meets the preset time, the heater of the current vehicle is turned on, and the range extender is turned off after the preset time.

[0052] If the slope of the road ahead is less than or equal to the preset slope value, or the length of the road ahead is less than or equal to the preset length value, then the passenger compartment and / or the power battery will be heated by the waste heat of the range extender engine.

[0053] Furthermore, the charged region is the second preset region, and the recycling module is specifically used for:

[0054] The range extender of the current vehicle is controlled to be in a preset working state, and it is determined whether there are traffic lights or preset congestion sections on the road ahead of the current vehicle.

[0055] If the road ahead contains the traffic light or the preset congestion section, the second time it takes for the current vehicle to reach the traffic light or the preset congestion section is calculated based on the navigation information of the current vehicle. When the second time meets the preset time, the heater of the current vehicle is turned on, and the range extender is turned off after the preset time.

[0056] If there are no traffic lights or preset congested sections on the road ahead, the waste heat from the range extender engine will be used to heat the passenger compartment and / or the power battery.

[0057] Furthermore, the charged region is the third preset region, and the recycling module is specifically used for:

[0058] The range extender of the current vehicle is kept in an inactive state, and the current power demand of the accelerator pedal is detected.

[0059] If the current power demand is less than the power battery power, then the controller is placed in the preset working state.

[0060] Furthermore, after determining whether the current vehicle's passenger compartment and / or power battery have the heating requirement, the determining module is further configured to:

[0061] If neither the passenger compartment nor the battery requires heating, then the engine waste heat recovery operation will not be performed.

[0062] A vehicle includes: a memory, a processor, and a computer program stored in the memory and executable on the processor, the processor executing the program to implement the engine waste heat recovery method of the vehicle as described in the above embodiments.

[0063] A computer-readable storage medium having a computer program stored thereon, the program being executed by a processor to implement the engine waste heat recovery method for a vehicle as described in the above embodiments.

[0064] The beneficial effects of this invention are as follows: This invention combines vehicle map navigation information to activate the PTC 10 seconds before the vehicle's range extender stops running, so that the PTC temperature reaches the required temperature for heating the passenger compartment or the power battery in advance. This avoids the situation where the passenger compartment temperature fluctuates when the PTC is restarted after the range extender stops, thereby improving the user experience. Attached Figure Description

[0065] Figure 1 is a flowchart of a vehicle engine waste heat recovery method provided in an embodiment of the present invention;

[0066] Figure 2 is a flowchart of a control method for waste heat recovery and utilization of a range extender engine according to an embodiment of the present invention;

[0067] Figure 3 is a block diagram of the vehicle engine waste heat recovery device according to an embodiment of the present invention;

[0068] Figure 4 is a structural schematic diagram of the vehicle according to an embodiment of the present invention.

[0069] Among them, 10-vehicle engine waste heat recovery device, 100-judgment module, 200-determination module, 300-recovery module, 401-memory, 402-processor, and 403-communication interface. Detailed Implementation

[0070] The embodiments of the present invention will be described below with reference to the accompanying drawings and preferred embodiments. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. It should be understood that the preferred embodiments are only for illustrating the present invention and not for limiting the scope of protection of the present invention.

[0071] It should be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of the present invention. Therefore, the drawings only show the components related to the present invention and are not drawn according to the actual number, shape and size of the components in the actual implementation. In the actual implementation, the form, quantity and proportion of each component can be arbitrarily changed, and the layout of the components may also be more complex.

[0072] Before introducing the vehicle engine waste heat recovery method proposed in the embodiments of the present invention, let's briefly introduce the related technology of range-extended vehicle passenger compartment heating method.

[0073] In related technologies, the passenger compartment heating function of range-extended vehicles often uses PTC as a heat source. In order to utilize engine heat, some range-extended vehicles adopt the strategy of using the engine's waste heat for heating when starting up, and immediately starting the PTC for heating after the engine stops.

[0074] However, this method not only wastes engine heat and increases vehicle energy consumption, but also takes a certain amount of time from PTC startup to reaching a certain temperature, resulting in fluctuations in the passenger compartment temperature and a poor user experience.

[0075] Based on the aforementioned problems, this invention proposes a method for recovering waste heat from a vehicle's engine. In this method, when it is determined that there is no heating requirement in the vehicle's passenger compartment and / or the power battery, the current state of charge (SOC) of the power battery is detected. Based on the current SOC's charge range and / or the current road conditions, a waste heat recovery strategy for the vehicle is determined, and the engine waste heat recovery operation is performed according to the strategy. This solves the problem of passenger compartment temperature fluctuations caused by restarting the PTC after the vehicle's range extender has stopped, thereby improving the user experience.

[0076] Specifically, Figure 1 is a flowchart of a vehicle engine waste heat recovery method provided in an embodiment of this application.

[0077] As shown in Figure 1, the waste heat recovery method for the vehicle's engine includes the following steps:

[0078] In step S101, it is determined whether there is a heating requirement in the passenger compartment and / or power battery of the current vehicle.

[0079] In this embodiment of the invention, the system can determine whether the vehicle has a need for passenger compartment heating or power battery heating based on user settings and the status of the power battery.

[0080] In step S102, if there is a heating requirement for the passenger compartment and / or the power battery, the current state of charge (SOC) of the power battery is detected, and the charge range of the current SOC is determined.

[0081] Furthermore, in this embodiment, the charge interval includes a first to a third preset charge interval, wherein the first preset charge interval is: the current SOC is less than a first preset value; the second preset charge interval is: the current SOC is greater than or equal to the first preset value, and the current SOC is less than the second preset value; and the third preset charge interval is: the current SOC is greater than or equal to the second preset value.

[0082] The first and second preset values ​​can be values ​​pre-set by those skilled in the art, values ​​obtained through a limited number of experiments, or values ​​obtained through a limited number of computer simulations; no specific limitations are imposed here.

[0083] Understandably, if the vehicle has a need for passenger compartment heating or power battery heating, the vehicle can detect the power battery SOC in real time and classify the current SOC according to the preset charge range.

[0084] In step S103, the waste heat recovery strategy of the current vehicle is determined based on the charge range and / or the current road conditions of the current vehicle, and the engine waste heat recovery action is performed according to the waste heat recovery strategy.

[0085] It is understandable that during the operation of the range extender, the vehicle navigation can detect the road conditions ahead in real time. In this embodiment of the invention, the waste heat recovery strategy of the current vehicle can be determined according to the charge range and / or the current road conditions of the current vehicle. Different recovery control strategies are adopted to utilize the waste heat of the range extender at different SOC ranges and under different road conditions.

[0086] Furthermore, in this embodiment, the charge range is a first preset range. The waste heat recovery strategy of the current vehicle is determined according to the charge range and / or the current road conditions of the current vehicle, and the engine waste heat recovery action is performed according to the waste heat recovery strategy, including: controlling the current vehicle's range extender to be in a preset working state and obtaining the current vehicle's engine water temperature; if the water temperature is higher than the preset temperature, the passenger compartment and / or power battery are heated by the waste heat of the range extender engine.

[0087] The preset temperature can be pre-set by those skilled in the art, obtained through a limited number of experiments, or obtained through a limited number of computer simulations; no specific limitation is made here.

[0088] Specifically, in this embodiment of the invention, when the SOC of the power battery is less than the vehicle's forced maintenance SOC1 (i.e., the first preset value), it indicates that the charge range is the first preset range. At this time, the SOC of the vehicle's power battery is extremely low, and the vehicle's range extender is controlled to start working to charge the power battery (i.e., the range extender is in a preset working state). At the same time, the current engine coolant temperature of the vehicle is obtained. When the engine coolant temperature is greater than the minimum coolant temperature T0 for waste heat recovery (i.e., the preset temperature), the vehicle enters the waste heat recovery state, opens the waste heat recovery three-way valve, and uses the waste heat from the range extender engine to heat the passenger compartment and / or the power battery.

[0089] Furthermore, in this embodiment, after controlling the current vehicle's range extender to be in a preset operating state, the method further includes:

[0090] The system determines whether the slope of the road ahead is greater than a preset slope value and whether the length of the road ahead is greater than a preset length value. If the slope and length of the road ahead are both greater than the preset slope and length values, the system calculates the first time it takes for the vehicle to reach the road ahead based on the vehicle's navigation information. If the first time meets the preset time, the system activates the vehicle's heater and deactivates the range extender after the preset time. If the slope or length of the road ahead is less than or equal to the preset slope or length values, the system uses the waste heat from the range extender engine to heat the passenger compartment and / or the power battery.

[0091] The preset slope value, preset length value, and preset duration can be preset by those skilled in the art, obtained through a limited number of experiments, or obtained through a limited number of computer simulations, and are not specifically limited here.

[0092] Specifically, in this embodiment of the invention, during the operation of the range extender, the vehicle navigation system can detect road conditions ahead in real time. Based on the current road conditions, it can determine whether there is a long downhill section ahead. If the slope of the road ahead is greater than a preset slope value, and the length of the road ahead is greater than a preset length value, it indicates that there is a long downhill section ahead. The time to reach the long downhill section (i.e., the first duration) needs to be calculated based on the current vehicle speed. 10 seconds before reaching the long downhill section (i.e., the preset duration), the PTC is activated to allow the PTC to reach the passenger compartment and / or the power battery. To prevent temperature fluctuations in the passenger compartment when the range extender is turned off on long downhill sections, the range extender is turned off after reaching the long downhill section (i.e., PTC is on for 10 seconds), and the power battery is charged by regenerative braking and coasting energy recovery. If the slope of the road ahead is less than or equal to the preset slope value, or the length of the road ahead is less than or equal to the preset length value, it indicates that there is no long downhill section ahead. In this case, the waste heat recovery three-way valve needs to be kept open to heat the passenger compartment and / or the power battery with the waste heat from the range extender engine.

[0093] Furthermore, in this embodiment, the charge range is a second preset range. The waste heat recovery strategy for the current vehicle is determined based on the charge range and / or the current road conditions. The engine waste heat recovery action is then performed according to the strategy, including: controlling the vehicle's range extender to a preset operating state and determining whether there are traffic lights or preset congestion sections on the road ahead; if there are traffic lights or preset congestion sections, the second time it takes for the vehicle to reach the traffic lights or preset congestion sections is calculated based on the vehicle's navigation information, and the vehicle's heater is activated when the second time meets the preset time, and the range extender is deactivated after the preset time; if there are no traffic lights or preset congestion sections on the road ahead, the passenger compartment and / or the power battery are heated using the waste heat from the range extender engine.

[0094] Specifically, in this embodiment of the invention, when the SOC of the power battery is greater than or equal to the vehicle's forced maintenance SOC1, and the power battery SOC is less than the user-set maintenance SOC2 (i.e., the second preset value), the vehicle's power battery SOC is low, and the vehicle's range extender is controlled to work to charge the power battery (i.e., the range extender is in a preset working state). Simultaneously, the waste heat from the range extender's engine is used to heat the passenger compartment and / or the power battery. During the operation of the range extender, based on the real-time road condition information detected by the vehicle navigation system, it is determined whether there are traffic lights or congested sections ahead. If there is a traffic light or congested road ahead, the time to reach the traffic light or congested road can be calculated based on the current vehicle speed (i.e., the second duration). The PTC (Power Transmission Control) is activated 10 seconds before reaching the traffic light or congested road (i.e., the preset duration) to allow the PTC to reach the required temperature for heating the passenger compartment / battery. This prevents temperature fluctuations in the passenger compartment when the range extender is turned off at the traffic light or congested road. After reaching the traffic light or congested road (i.e., 10 seconds after PTC activation), the range extender is turned off to avoid discomfort caused by noise and NVH (Noise, Vibration, and Harshness) from the range extender operating when the vehicle is stopped or at low speeds. If the navigation information indicates that there is no traffic light or congested road ahead, the waste heat recovery three-way valve needs to be kept open to heat the passenger compartment and / or battery using the waste heat from the range extender engine.

[0095] Furthermore, in this embodiment, the charge range is a third preset range. The waste heat recovery strategy of the current vehicle is determined based on the charge range and / or the current road conditions of the current vehicle, and the engine waste heat recovery action is performed according to the waste heat recovery strategy, including: controlling the current vehicle's range extender to be in an inactive state and detecting the current power demand of the accelerator pedal; if the current power demand is less than the power of the power battery, the range extender is controlled to be in a preset working state.

[0096] Specifically, in this embodiment of the invention, when the SOC of the power battery is greater than or equal to the user-set maintenance SOC2, the vehicle's power battery SOC is high, and the vehicle's range extender is controlled to not work (i.e., in a non-working state). The current power demand of the accelerator pedal is detected, and the range extender will only be activated when the power battery power does not meet the current power demand of the accelerator pedal.

[0097] It should be noted that the range extender has an extremely low probability of starting and a very short working time in the above operating conditions (i.e., the charging range is the third preset range). Therefore, the waste heat of the range extender engine will not be utilized. At this time, the SOC of the power battery is high, and the range extender will only be started to replenish energy when the power battery discharge power is less than the power required by the accelerator pedal.

[0098] Furthermore, in this embodiment, after determining whether there is a heating requirement in the passenger compartment and / or the power battery of the current vehicle, the method further includes: if there is no heating requirement in either the passenger compartment or the battery, then the engine preheating recovery action is not performed.

[0099] Understandably, if the vehicle does not require heating of the passenger compartment or the power battery, the three-way valve for waste heat recovery of the range extender can be closed, and the waste heat of the range extender will not be utilized.

[0100] To help those skilled in the art further understand the vehicle engine waste heat recovery method proposed in the embodiments of the present invention, further explanation is provided below with reference to Figure 2.

[0101] As shown in Figure 2, Figure 2 is a flowchart of a control method for waste heat recovery and utilization of a range extender engine according to an embodiment of the present invention, including the following steps:

[0102] Step S201, Begin;

[0103] Step S202: Determine whether (the vehicle) has a need for passenger compartment heating or power battery heating.

[0104] If the vehicle has no need for heating of the passenger compartment and power battery, then proceed to step S203 and do not recover the engine waste heat.

[0105] If the vehicle requires heating for the passenger compartment and power battery, then step S204 is executed to detect the power battery SOC in real time.

[0106] Step S2011: Power battery SOC < Vehicle forced maintenance SOC 1; (At this time, the vehicle's power battery SOC is extremely low)

[0107] Step S2012: The vehicle control range extender is activated;

[0108] Step S2013: Determine whether the range extender engine coolant temperature is greater than the minimum waste heat recovery coolant temperature T0;

[0109] If so, proceed to step S2014 to open the waste heat recovery three-way valve and recover waste heat;

[0110] Step S2015, (during the operation of the range extender) determine whether there is a long downhill section ahead;

[0111] If there is a long downhill section ahead, proceed to step S2016 to calculate the time to reach the long downhill section based on the navigation information.

[0112] Step S2017: Activate PTC 10 seconds before reaching the long downhill section;

[0113] Step S2018, (after reaching the long downhill section (i.e., PTC is activated for 10 seconds)) turn off the range extender;

[0114] If there is no long downhill section ahead, proceed to step S2019 to continuously recover engine waste heat;

[0115] Step S2021, (vehicle) forcibly maintain SOC1 ≤ power battery SOC < user-set maintenance SOC2; (at this time, the vehicle's power battery SOC is low)

[0116] Step S2022: The vehicle controls the range extender to operate;

[0117] Step S2023, (during the operation of the range extender) determine whether there are traffic lights or congested sections ahead;

[0118] If there is a traffic light or congested road ahead, proceed to step S2024 to calculate the time to reach the traffic light or congested road based on the navigation information.

[0119] Step S2025: Activate PTC 10 seconds before arriving at a traffic light or congested section of road;

[0120] Step S2026, (after reaching a traffic light or congested section of road (i.e., PTC has been activated for 10 seconds)) turn off the range extender;

[0121] If there are no traffic lights or congested sections ahead, proceed to step S2027 to continuously recover engine waste heat.

[0122] Step S2031: The SOC of the power battery is greater than or equal to the user-set maintenance SOC2; (at this time, the SOC of the vehicle's power battery is high)

[0123] In step S2032, the vehicle control range extender is not working;

[0124] Step S2033: No waste heat from the engine is recovered;

[0125] Step S2034: The range extender is activated only when the power demanded by the accelerator pedal is less than the power of the battery.

[0126] The vehicle engine waste heat recovery method proposed in this application involves detecting the current state of charge (SOC) of the power battery when it is determined that there is no heating requirement in the passenger compartment and / or the power battery. Based on the current SOC's charge range and / or the current road conditions, a waste heat recovery strategy is determined, and engine waste heat recovery is performed according to the strategy. This solves the problem of passenger compartment temperature fluctuations caused by restarting the PTC after the vehicle's range extender has stopped, thereby improving the user experience.

[0127] Next, referring to the accompanying drawings, a waste heat recovery device for a vehicle engine according to an embodiment of this application is described.

[0128] Figure 3 is a block diagram of a vehicle engine waste heat recovery device according to an embodiment of this application.

[0129] As shown in Figure 3, the vehicle's engine waste heat recovery device 10 includes: a judgment module 100, a determination module 200, and a recovery module 300.

[0130] The judgment module 100 is used to determine whether there is a heating requirement in the passenger compartment and / or power battery of the current vehicle.

[0131] The determination module 200 is used to detect the current state of charge (SOC) of the power battery and determine the charge range of the current SOC when there is a heating requirement in the passenger compartment and / or the power battery; and

[0132] The recovery module 300 is used to determine the current vehicle's waste heat recovery strategy based on the charge range and / or the current road conditions of the vehicle, and to perform engine waste heat recovery actions according to the waste heat recovery strategy.

[0133] Furthermore, in this embodiment, the charge interval includes a first to a third preset charge interval, wherein,

[0134] The first preset charge range is: the current SOC is less than the first preset value;

[0135] The second preset charge range is: the current SOC is greater than or equal to the first preset value, and the current SOC is less than the second preset value;

[0136] The third preset charge range is: the current SOC is greater than or equal to the second preset value.

[0137] Furthermore, in this embodiment, the charging range is a first preset range, and the recovery module 300 is specifically used for:

[0138] Control the current vehicle's range extender to a preset working state and obtain the current vehicle's engine coolant temperature;

[0139] If the water temperature is higher than the preset temperature, the waste heat from the range extender engine will be used to heat the passenger compartment and / or the power battery.

[0140] Furthermore, after controlling the current vehicle's range extender to a preset operating state, the recovery module 300 is also used for:

[0141] Determine whether the slope of the road ahead of the current vehicle is greater than a preset slope value, and whether the length of the road ahead is greater than a preset length value;

[0142] If the slope of the road ahead is greater than the preset slope value and the length of the road ahead is greater than the preset length value, the first time it takes for the current vehicle to reach the road ahead is calculated based on the current vehicle's navigation information. When the first time meets the preset time, the heater of the current vehicle is turned on, and the range extender is turned off after the preset time.

[0143] If the slope of the road ahead is less than or equal to the preset slope value, or the length of the road ahead is less than or equal to the preset length value, the waste heat from the range extender engine will be used to heat the passenger compartment and / or the power battery.

[0144] Furthermore, in this embodiment, the charging range is a second preset range, and the recovery module 300 is specifically used for:

[0145] Control the current vehicle's range extender to be in a preset working state, and determine whether there are traffic lights or preset congestion sections on the road ahead of the current vehicle.

[0146] If there are traffic lights or preset congestion sections on the road ahead, the system calculates the second time it will take for the vehicle to reach the traffic lights or preset congestion sections based on the current vehicle's navigation information. If the second time meets the preset time, the system turns on the vehicle's heater and turns off the range extender after the preset time.

[0147] If there are no traffic lights or pre-set congested sections on the road ahead, the waste heat from the range extender engine will be used to heat the passenger compartment and / or the power battery.

[0148] Furthermore, in this embodiment, the charging range is a third preset range, and the recovery module 300 is specifically used for:

[0149] Keep the current vehicle's range extender in a non-operating state and detect the current power demand of the accelerator pedal;

[0150] If the current power demand is less than the power battery power, the controller will be in a preset working state.

[0151] Furthermore, in this embodiment, after determining whether there is a heating requirement in the passenger compartment and / or power battery of the current vehicle, the determination module 100 is further configured to:

[0152] If neither the crew compartment nor the battery requires heating, then the engine waste heat recovery operation will not be performed.

[0153] The engine waste heat recovery device proposed in this application detects the current state of charge (SOC) of the power battery when it is determined that there is no heating requirement in the passenger compartment and / or the power battery. Based on the current SOC's charge range and / or the current road conditions, it determines the vehicle's waste heat recovery strategy and performs engine waste heat recovery accordingly. This solves the problem of passenger compartment temperature fluctuations caused by restarting the PTC after the vehicle's range extender has stopped, thereby improving the user experience.

[0154] Figure 4 is a structural schematic diagram of a vehicle provided in an embodiment of this application. The vehicle may include:

[0155] The memory 401, the processor 402, and the computer program stored on the memory 401 and capable of running on the processor 402.

[0156] When processor 402 executes the program, it implements the vehicle engine waste heat recovery method provided in the above embodiments.

[0157] Furthermore, the vehicle also includes:

[0158] Communication interface 403 is used for communication between memory 401 and processor 402.

[0159] The memory 401 is used to store computer programs that can run on the processor 402.

[0160] The memory 401 may include high-speed RAM (Random Access Memory) memory, and may also include non-volatile memory, such as at least one disk storage.

[0161] If the memory 401, processor 402, and communication interface 403 are implemented independently, they can be interconnected via a bus to communicate with each other. The bus can be an ISA (Industry Standard Architecture) bus, a PCI (Peripheral Component Interconnect) bus, or an EISA (Extended Industry Standard Architecture) bus, etc. Buses can be categorized as address buses, data buses, control buses, etc. For ease of representation, only one thick line is used in Figure 4, but this does not indicate that there is only one bus or one type of bus.

[0162] Optionally, in a specific implementation, if the memory 401, processor 402, and communication interface 403 are integrated on a single chip, then the memory 401, processor 402, and communication interface 403 can communicate with each other through an internal interface.

[0163] Processor 402 may be a CPU (Central Processing Unit), an ASIC (Application Specific Integrated Circuit), or one or more integrated circuits configured to implement embodiments of this application.

[0164] This application also provides a computer-readable storage medium storing a computer program that, when executed by a processor, implements the above-described method for recovering waste heat from a vehicle engine.

[0165] The above embodiments are merely preferred embodiments provided to fully illustrate the present invention, and the scope of protection of the present invention is not limited thereto. Equivalent substitutions or modifications made by those skilled in the art based on the present invention are all within the scope of protection of the present invention.

Claims

1. A method for recovering waste heat from a vehicle engine, characterized in that, Includes the following steps: The system determines whether there is a heating requirement in the passenger compartment and / or the power battery of the current vehicle. If the passenger compartment and / or the power battery have the heating requirement, the system detects the current state of charge (SOC) of the power battery and determines the charge range in which the current SOC is located. Based on the charge range and / or the current road conditions of the current vehicle, the system determines the waste heat recovery strategy for the current vehicle and performs engine waste heat recovery according to the waste heat recovery strategy. The charge range includes a first to a third preset charge range, wherein the first preset charge range is: the current SOC is less than a first preset value; the second preset charge range is: the current SOC is greater than or equal to the first preset value, and the current SOC is less than the second preset value; the third preset charge range is: the current SOC is greater than or equal to the second preset value; the charge range is... The second preset charge range, the step of determining the waste heat recovery strategy of the current vehicle based on the charge range and / or the current road conditions of the current vehicle, and performing engine waste heat recovery actions according to the waste heat recovery strategy, includes: controlling the range extender of the current vehicle to be in a preset working state, and determining whether there are traffic lights or preset congestion sections on the road ahead of the current vehicle; if there are traffic lights or preset congestion sections on the road ahead, calculating the second time for the current vehicle to reach the traffic lights or preset congestion sections based on the navigation information of the current vehicle, and turning on the heater of the current vehicle when the second time meets the preset time, and turning off the range extender after the preset time; if there are no traffic lights or preset congestion sections on the road ahead, heating the passenger compartment and / or the power battery with the waste heat from the range extender engine.

2. The method according to claim 1, characterized in that, The charge range is the first preset charge range. The step of determining the waste heat recovery strategy of the current vehicle based on the charge range and / or the current road conditions of the current vehicle, and performing engine waste heat recovery actions according to the waste heat recovery strategy, includes: controlling the range extender of the current vehicle to be in a preset working state, and obtaining the engine coolant temperature of the current vehicle; if the coolant temperature is greater than the preset temperature, then heating the passenger compartment and / or the power battery with the waste heat of the range extender engine.

3. The method according to claim 2, characterized in that, After controlling the range extender of the current vehicle to be in the preset working state, the method further includes: determining whether the slope of the road ahead of the current vehicle is greater than a preset slope value and whether the length of the road ahead is greater than a preset length value; if the slope of the road ahead is greater than the preset slope value and the length of the road ahead is greater than the preset length value, then calculating the first time for the current vehicle to reach the road ahead based on the navigation information of the current vehicle, and when the first time meets the preset time, turning on the heater of the current vehicle, and turning off the range extender after the preset time; if the slope of the road ahead is less than or equal to the preset slope value, or the length of the road ahead is less than or equal to the preset length value, then heating the passenger compartment and / or the power battery with the waste heat of the range extender engine.

4. The method according to claim 1, characterized in that, The charge range is the third preset charge range. The step of determining the waste heat recovery strategy of the current vehicle based on the charge range and / or the current road conditions of the current vehicle, and performing engine waste heat recovery actions according to the waste heat recovery strategy, includes: controlling the range extender of the current vehicle to be in an inactive state, and detecting the current power demand of the accelerator pedal; if the current power demand is less than the power of the power battery, then controlling the range extender to be in the preset working state.

5. The method according to claim 1, characterized in that, After determining whether the current vehicle's passenger compartment and / or power battery have the heating requirement, the method further includes: if neither the passenger compartment nor the battery has the heating requirement, then the engine waste heat recovery action is not performed.

6. A waste heat recovery device for a vehicle engine, characterized in that, The engine waste heat recovery device is used to implement the method as described in any one of claims 1-5. The engine waste heat recovery device includes: a judgment module, used to judge whether there is a heating requirement in the passenger compartment and / or the power battery of the current vehicle; a determination module, used to detect the current state of charge (SOC) of the power battery and determine the charge range in which the current SOC is located if the heating requirement exists in the passenger compartment and / or the power battery; and a recovery module, used to determine the waste heat recovery strategy of the current vehicle based on the charge range and / or the current road conditions of the current vehicle, and to perform engine waste heat recovery actions according to the waste heat recovery strategy.

7. A vehicle, characterized in that, include: A memory, a processor, and a computer program stored in the memory and executable on the processor, the processor executing the program to implement the engine waste heat recovery method for a vehicle as described in any one of claims 1-5.

8. A computer-readable storage medium having a computer program stored thereon, characterized in that, The program is executed by the processor to implement the engine waste heat recovery method for a vehicle as described in any one of claims 1-5.

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