Energy-saving control method, device and equipment of hybrid vehicle and storage medium

Abstract

This invention discloses an energy-saving control method, device, equipment, and storage medium for hybrid vehicles, relating to the field of automotive intelligent control. The method includes, under cold start conditions, adjusting the vehicle's operating needs based on the following: for battery insulation, heating the battery using a self-heating mode or engine heat, based on the ambient temperature drop rate, battery temperature, and engine operating status; and for passenger compartment heating, heating the passenger compartment using a PTC heating mode, motor heat, or engine heat, based on the remaining battery charge, vehicle driving time, and engine operating status. This application effectively achieves energy savings for vehicles.

Description

Technical Field

[0001] This application relates to the field of intelligent automotive control, specifically to an energy-saving control method, device, equipment, and storage medium for hybrid vehicles. Background Technology

[0002] Thermal management technology has always occupied an important position in automotive research and development. The quality of thermal management not only affects the driving comfort of passengers, but also affects the overall performance of a vehicle. The impact of thermal management on vehicle performance is more obvious and important in pure electric vehicles or hybrid vehicles.

[0003] Traditional gasoline-powered vehicles primarily address heat dissipation in the engine compartment and heating / cooling of the passenger compartment. New energy vehicles, however, must solve not only these issues but also the heat dissipation of the three core electric systems (motor, electronic control, and battery), particularly the battery system's heat dissipation and insulation. Due to changes in vehicle physical structure, the main energy source for new energy vehicles is the electrical energy from the power battery. This battery not only powers the drive motor but also provides driving energy for electrical accessories throughout the vehicle (such as the electric air compressor, electric power steering, coolant pump, electric fan, and PTC air conditioning system). Therefore, energy conservation and emission reduction are key technologies for new energy vehicles. The effectiveness of thermal management control strategies directly impacts the vehicle's power output (performance) and driving range (economy).

[0004] The promotion of new energy vehicles in cold winter regions such as northern China has always been limited, mainly because the battery systems of new energy vehicles are quite sensitive to temperature. It's not uncommon for new energy vehicles to fail to start or drive in winter due to low temperatures. Currently, some new energy vehicle manufacturers have developed automatic battery insulation functions to address the issues of limited battery discharge power in cold winter regions and the inability of batteries to discharge at high power after being chilled. These functions automatically activate the heating system to prevent further temperature drops when the battery temperature drops to a certain threshold. Technically, some use liquid thermal solutions, while others use heating films. Both solutions undoubtedly increase the battery's energy consumption, reducing range. Another issue is heating the passenger compartment in winter. The energy for heating with PTC (Positive Temperature Coefficient) comes from the power battery, which also increases power consumption and reduces vehicle range. Summary of the Invention

[0005] This application provides an energy-saving control method, device, equipment, and storage medium for hybrid vehicles, which can effectively achieve energy saving in vehicles.

[0006] In a first aspect, embodiments of this application provide an energy-saving control method for a hybrid vehicle, the energy-saving control method for the hybrid vehicle comprising:

[0007] According to vehicle usage requirements under cold start conditions:

[0008] Under the requirement of power battery insulation, based on the rate of decrease of ambient temperature, power battery temperature and engine operating status, the power battery self-heating mode or engine heat is used to heat the power battery.

[0009] When the passenger compartment needs heating, the PTC heating mode, motor heat, or engine heat are used to achieve passenger compartment heating based on the remaining power of the power battery, vehicle driving time, and engine operating status.

[0010] In conjunction with the first aspect, in one implementation method,

[0011] The cold start condition refers to the first time a vehicle is powered on and driven after being stationary in a frigid winter region.

[0012] During the cold start condition, the vehicle's HMC collects the ambient temperature and power battery temperature in real time through temperature sensors and sends them to the vehicle controller. The vehicle controller then uses the ambient temperature, motor temperature, power battery temperature, engine coolant temperature, and AC request signal to implement logical control for power battery heating and passenger compartment heating.

[0013] In conjunction with the first aspect, in one implementation method, the method for heating the power battery using a self-heating mode is as follows:

[0014] When the rate of decrease of ambient temperature is greater than the set rate threshold and the power battery temperature is less than the set low temperature threshold, the vehicle controller sends a PTC activation signal to the BMS, and the power battery activates the self-heating mode.

[0015] When the vehicle controller detects that the coolant temperature of the power battery is greater than the set high temperature threshold, or the power battery temperature is higher than the set temperature, the vehicle controller sends a signal to the BMS to turn off the PTC heating, and the power battery turns off the self-heating mode.

[0016] In conjunction with the first aspect, in one implementation method, the use of engine heat to heat the power battery specifically includes:

[0017] When the rate of decrease of ambient temperature is less than the set rate threshold and the power battery temperature is less than the set low temperature threshold, the vehicle controller will not send a PTC start signal, the power battery self-heating mode will not be activated, and after the vehicle high voltage is powered on, if the power battery charge is higher than the engine start threshold and the power battery charging conditions are met, the vehicle controller will send an engine start request signal. The engine controller will control the engine to start high idle speed or enter the power generation mode after the engine is warmed up. When the engine coolant temperature is higher than the preset temperature threshold, the high temperature coolant of the engine will be introduced into the inlet of the power battery cooling circulation system based on the four-way valve set at the outlet of the engine cooling circulation system to heat the power battery.

[0018] When the power battery temperature reaches the normal operating temperature and the discharge power meets the vehicle's requirements, the vehicle controller controls the engine to shut down.

[0019] In conjunction with the first aspect, in one implementation method,

[0020] A fourth water pump is installed on the pipeline between the four-way valve and the water inlet of the power battery cooling circulation system.

[0021] When the engine coolant temperature is higher than the preset temperature threshold, the high-temperature coolant of the engine needs to be introduced into the water inlet of the power battery cooling circulation system. The fourth water pump works and operates at maximum power.

[0022] When the power battery temperature reaches the normal operating temperature and the discharge power meets the vehicle's requirements, the fourth water pump stops working when the vehicle controller controls the engine to stop.

[0023] In conjunction with the first aspect, in one implementation method, for heating the passenger compartment using PTC heating, motor heat, or engine heat, specifically:

[0024] When the power battery charge is detected to be higher than the engine start threshold during vehicle operation, the vehicle controller receives the AC heating request signal and controls the PTC to turn on. At this time, the PTC heating mode is used to heat the passenger compartment.

[0025] If the motor stator windings generate heat after the vehicle is in motion, requiring the motor to dissipate heat, the motor cooling circulation system will be activated and the power of the PTC will be reduced. Based on the three-way valve set at the outlet of the motor cooling circulation system, the high-temperature coolant will be introduced into the heater core. At this time, the PTC and the heat from the motor will work together to heat the passenger compartment.

[0026] When the engine is running and the engine coolant temperature is higher than the preset temperature threshold, the vehicle controller shuts down the PTC and stops introducing the high-temperature coolant from the motor cooling circulation system to the heater core. Based on the four-way valve set at the outlet of the engine cooling circulation system, a portion of the high-temperature coolant from the engine is introduced into the heater core, and the heat from the engine is used to heat the passenger compartment.

[0027] In conjunction with the first aspect, in one implementation method,

[0028] A fifth water pump is installed on the pipeline between the water outlet of the motor cooling circulation system and the heater core.

[0029] A second water pump is provided at the water inlet of the motor cooling circulation system;

[0030] When the motor cooling circulation system is turned on and the power of the PTC is reduced, the high-temperature coolant is introduced into the warm air core by the three-way valve set at the outlet of the motor cooling circulation system, and the fifth and second water pumps are turned on.

[0031] When the engine is running and the engine coolant temperature is higher than the preset temperature threshold, the vehicle controller sends a command signal to shut down the fifth water pump when the PTC is turned off.

[0032] Secondly, embodiments of this application provide an energy-saving control device for a hybrid vehicle, the energy-saving control device for the hybrid vehicle comprising:

[0033] The judgment module is used to determine the vehicle's usage needs during cold start conditions. If the need is for power battery insulation, the first execution module will be activated; if the need is for passenger compartment heating, the second execution module will be activated.

[0034] The first execution module is used to heat the power battery by adopting the power battery self-heating mode or the engine heat based on the rate of decrease of ambient temperature, the power battery temperature and the engine operating status.

[0035] The second execution module is used to heat the passenger compartment based on the remaining power of the power battery, the vehicle's driving time, and the engine's operating status, using PTC heating mode, motor heat, or engine heat.

[0036] Thirdly, embodiments of this application provide an energy-saving control device for a hybrid vehicle. The energy-saving control device for a hybrid vehicle includes a processor, a memory, and an energy-saving control program for the hybrid vehicle stored in the memory and executable by the processor. When the energy-saving control program for the hybrid vehicle is executed by the processor, it implements the steps of the energy-saving control method for the hybrid vehicle described above.

[0037] Fourthly, embodiments of this application provide a computer-readable storage medium storing an energy-saving control program for a hybrid vehicle, wherein when the energy-saving control program for the hybrid vehicle is executed by a processor, it implements the steps of the energy-saving control method for the hybrid vehicle described above.

[0038] The beneficial effects of the technical solutions provided in this application include:

[0039] 1. By monitoring changes in ambient temperature and collecting engine water temperature, motor coolant temperature, and power battery temperature in real time, the system uses corresponding strategies to control the opening and closing of the PTC and corresponding water pumps, effectively solving the problem that the BMS cannot discharge at high power due to the low temperature of the battery pack in cold environments, and that the discharge power cannot meet the power required for the vehicle to run.

[0040] 2. It can save energy and extend the driving range. By adopting the structure and strategy described in this application, the waste heat of the engine, the heat of the motor windings and the PTC heating are combined. The optimal heating method is selected through different control strategies to minimize the use time of the PTC and achieve the purpose of energy saving. Attached Figure Description

[0041] Figure 1 This is a flowchart of an energy-saving control method for a hybrid vehicle according to this application;

[0042] Figure 2 This is a schematic diagram of the coolant flow direction in a vehicle's thermal management system.

[0043] Figure 3 This is a schematic diagram of the structure of an energy-saving control device for a hybrid vehicle according to this application;

[0044] Figure 4 This is a schematic diagram of the hardware structure of the energy-saving control device for the hybrid vehicle of this application. Detailed Implementation

[0045] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present application.

[0046] To make the objectives, technical solutions, and advantages of this application clearer, the embodiments of this application will be described in further detail below with reference to the accompanying drawings.

[0047] Firstly, embodiments of this application provide an energy-saving control method for hybrid vehicles to address the problems of high energy consumption and shortened driving range of new energy vehicles in severe winter and cold regions. It should be noted that the energy-saving control method for hybrid vehicles described in this application is applicable to new energy vehicles containing a hybrid system. This vehicle has two power sources (engine and motor). By optimizing the thermal management control strategy, the physical characteristics of both are fully utilized, taking advantage of their strengths and compensating for their weaknesses, minimizing electricity consumption to extend the driving range and improve the problem of shortened driving range in winter for new energy vehicles.

[0048] In one embodiment, reference is made to Figure 1 , Figure 1 This is a flowchart illustrating the energy-saving control method for the hybrid vehicle described in this application. Figure 1 As shown, the energy-saving control methods for hybrid vehicles include:

[0049] S1: Under cold start conditions, depending on the vehicle's usage needs, if it is for the power battery to keep warm, switch to S2; if it is for the passenger compartment to keep warm, switch to S3.

[0050] S2: Based on the rate of decrease of ambient temperature, the temperature of the power battery and the operating status of the engine, the power battery is heated by either the self-heating mode of the power battery or by the heat from the engine.

[0051] S3: Based on the remaining power battery charge, vehicle driving time, and engine operating status, the passenger compartment is heated using PTC heating mode, motor heat, or engine heat.

[0052] For the hybrid vehicle described in this application, the coolant flow direction of its thermal management system is as follows: Figure 2 As shown, a four-way valve is installed at the engine coolant outlet, including one inlet and three outlets. Figure 2 In the middle, the upper end of the four-way valve is the water inlet and the lower end is the water outlet, which leads the high-temperature coolant of the engine out in three ways: one way leads to the engine radiator, one way leads to the power battery through the fourth water pump, and one way leads to the passenger compartment for heating after passing through the heater core and the blower. A three-way valve is set at the outlet of the motor coolant, which leads the high-temperature coolant of the motor out in two ways: one way leads to the passenger compartment through the fifth water pump and the heater core, and the other way leads to the motor radiator.

[0053] In addition, a water pump is installed at the coolant inlet of each of the engine, motor (drive motor), and power battery, designated as the first, second, and third water pumps, respectively. These water pumps not only provide power to the coolant but also allow for the shut-off of the water channels by controlling their on / off states. By default, the fourth and fifth water pumps are not operational, and the engine cooling cycle, motor cooling cycle, and power battery cooling cycle do not affect each other. Based on the different heat dissipation requirements of the engine, motor, and power battery, the first, second, and third water pumps are controlled to adjust their duty cycles (controlling water flow) according to preset temperature thresholds for heat dissipation. If necessary, fans can be controlled to assist in cooling.

[0054] Because the hybrid power system structurally decouples the engine and drive motor, it allows for flexible control strategies to manage engine start-up and shutdown. After engine start-up, it operates at high idle speed (or generates electricity) to quickly warm up the engine and raise the coolant temperature. Since the engine's normal operating coolant temperature is around 90°C, and the optimal operating temperature of the power battery is around 25°C, in cold winter regions, the heat generated by the engine's operation can be fully utilized to heat the battery pack, reducing the impact of low temperatures on battery performance. Based on operating conditions, the start-up time and operating duration of different water pumps can be strategically controlled through set temperature thresholds, thereby ensuring the entire cooling system operates within a reasonable temperature range.

[0055] Furthermore, in this application, the cold start condition refers to the condition where a vehicle is driven for the first time after being parked in a frigid winter region. Specifically, the cold start condition is defined as a vehicle being parked in the external environment for a certain period of time. For example, the first time a vehicle is driven after being parked at night in a winter in Northeast China (the parking time is generally more than 8 hours) is considered a cold start condition.

[0056] During cold start (i.e., in extremely low temperature environments), the vehicle's HMC (thermal management controller) collects ambient temperature and power battery temperature in real time through temperature sensors and sends them to the vehicle controller. The vehicle controller then uses ambient temperature, motor temperature, power battery temperature, engine coolant temperature, and AC (Air Conditioning) request signals to implement logical control for power battery heating and passenger compartment heating.

[0057] Furthermore, in one embodiment, the method of using a self-heating mode for power battery heating specifically involves:

[0058] When the rate of decrease of ambient temperature exceeds the set rate threshold and the power battery temperature is below the set low temperature threshold, the vehicle controller sends a PTC activation signal to the BMS (Battery Management System), and the power battery activates its self-heating mode. The rate of decrease of temperature refers to the amount of temperature decrease per unit time. The set low temperature threshold can be obtained through calibration.

[0059] When the vehicle controller detects that the coolant temperature of the power battery is greater than the set high temperature threshold, or the power battery temperature is higher than the set temperature, the vehicle controller sends a signal to the BMS to turn off the PTC heating, and the power battery turns off the self-heating mode.

[0060] Specifically, when the rate of decrease in ambient temperature is detected to be greater than the set rate threshold and the power battery temperature is lower than the set low temperature threshold, in order to prevent the impact of extreme low temperature on the power battery cells, the vehicle controller sends a PTC activation signal to the BMS, and the power battery activates the self-heating mode to maintain the power battery temperature within a certain temperature range; when the vehicle controller detects that the power battery coolant temperature is greater than the set high temperature threshold or the power battery cell temperature is higher than the set temperature, the vehicle controller sends a PTC deactivation signal to exit the battery heat preservation mode.

[0061] Furthermore, in one embodiment, the use of engine heat to heat the power battery specifically involves:

[0062] When the rate of decrease of ambient temperature is less than the set rate threshold and the power battery temperature is less than the set low temperature threshold, the vehicle controller will not send a PTC start signal, the power battery self-heating mode will not be activated, and after the vehicle high voltage is powered on, if the power battery charge is higher than the engine start threshold and the power battery charging conditions are met, the vehicle controller will send an engine start request signal. The engine controller will control the engine to start high idle speed or enter the power generation mode after the engine is warmed up. When the engine coolant temperature is higher than the preset temperature threshold, the high temperature coolant of the engine will be introduced into the inlet of the power battery cooling circulation system based on the four-way valve set at the outlet of the engine cooling circulation system to heat the power battery.

[0063] When the power battery temperature reaches the normal operating temperature and the discharge power meets the vehicle's requirements, the vehicle controller controls the engine to shut down.

[0064] It should be noted that a fourth water pump is installed on the pipeline between the four-way valve and the water inlet of the power battery cooling circulation system. When the engine water temperature is higher than the preset temperature threshold, and the high-temperature coolant of the engine needs to be introduced into the water inlet of the power battery cooling circulation system, the fourth water pump works and operates at maximum power. When the power battery temperature reaches the normal operating temperature and the discharge power meets the needs of the vehicle, and the vehicle controller controls the engine to stop, the fourth water pump stops working.

[0065] Specifically, when the rate of decrease in ambient temperature is less than a set threshold and the power battery temperature is less than a set low temperature threshold, the vehicle controller will not send a PTC start signal, and the insulation function will not be activated. After the vehicle is powered on by high voltage, if it is determined that the power battery charge is higher than the engine start threshold (normally, the battery SOC is less than or equal to 30% to meet the engine start condition, which here means that the engine can start even if the SOC is higher than 30%) and the charging conditions are met (e.g., SOC < 95%, the charging condition of SOC < 95% is to prevent the power battery from being overcharged), the vehicle controller will actively send an engine start request signal. The engine controller will then control the engine to start at high idle speed (normal idle speed 800 rpm, high idle speed above 3000 rpm) or enter the power generation mode after the engine has warmed up. The generated electricity can be directly used to power the motor to meet the power requirements of the vehicle. When the engine is under heavy load, the water temperature rises rapidly. When the water temperature exceeds the preset temperature threshold, the vehicle controller controls the fourth water pump to start and operate at maximum power to introduce the high-temperature engine coolant into the power battery to heat the battery. When the power battery temperature reaches the normal operating temperature and the discharge power meets the vehicle's requirements, the vehicle controller sends a shutdown signal to control the engine to stop and controls the fourth water pump to shut down. This effectively solves the problem of limited power battery discharge power and insufficient power performance to meet the vehicle's requirements caused by low temperature. In addition, this mode does not use PTC heating, which can reduce power consumption.

[0066] Regarding passenger compartment heating, this function is crucial throughout the entire vehicle usage process. For new energy vehicles, the electricity consumed for heating accounts for a significant portion of the overall vehicle energy consumption. This application can utilize the heat generated during motor operation. The heat sources include not only the engine's waste heat and the heat from PTC heating, but also the heat generated by the stator windings of the motor during operation.

[0067] Furthermore, in one embodiment, for heating the passenger compartment using PTC heating mode, motor heat, or engine heat, the specific method is as follows:

[0068] When the power battery charge is detected to be higher than the engine start threshold during vehicle operation, the vehicle controller receives the AC heating request signal and controls the PTC to turn on. At this time, the PTC heating mode is used to heat the passenger compartment.

[0069] If the motor stator windings generate heat after the vehicle is in motion, requiring the motor to dissipate heat, the motor cooling circulation system will be activated and the power of the PTC will be reduced. Based on the three-way valve set at the outlet of the motor cooling circulation system, the high-temperature coolant will be introduced into the heater core. At this time, the PTC and the heat from the motor will work together to heat the passenger compartment.

[0070] When the engine is running and the engine coolant temperature is higher than the preset temperature threshold, the vehicle controller shuts down the PTC and stops introducing the high-temperature coolant from the motor cooling circulation system to the heater core. Based on the four-way valve set at the outlet of the engine cooling circulation system, a portion of the high-temperature coolant from the engine is introduced into the heater core, and the heat from the engine is used to heat the passenger compartment.

[0071] It should be noted that a fifth water pump is installed on the pipeline between the outlet of the motor cooling circulation system and the heater core; a second water pump is installed on the inlet of the motor cooling circulation system; when the motor cooling circulation system is turned on and the power of the PTC is reduced, the high-temperature coolant is introduced into the heater core through the three-way valve installed at the outlet of the motor cooling circulation system, and the fifth and second water pumps are turned on; when the engine is running and the engine coolant temperature is higher than the preset temperature threshold, the vehicle controller sends a command signal to turn off the fifth water pump when the PTC is turned off.

[0072] Specifically, in low-temperature environments, when the vehicle is driving and the battery charge is detected to be higher than the engine start-up threshold (e.g., SOC > 30%), the engine will not operate. In this case, PTC heating will be used first to ensure the comfort of the passenger compartment. After receiving the AC heating request signal, the vehicle controller will control the PTC to turn on. After driving for a period of time, the motor stator windings will generate heat that needs to be dissipated. At this time, the vehicle controller will control the fifth and second water pumps to turn on and reduce the power of the PTC, so that the heat from the motor stator windings can be introduced into the heater core to heat the passenger compartment. At this time, the heating is provided by the PTC and the heat from the motor. If the engine is detected to be running and the coolant temperature is higher than the preset temperature threshold, the vehicle controller will send a command signal to turn off the PTC and the fifth water pump. At this time, the waste heat from the engine will be used to heat the hot air vented from the heater core to heat the passenger compartment, which greatly shortens the working time and power of the PTC and can effectively reduce the power battery energy consumption.

[0073] Secondly, embodiments of this application also provide an energy-saving control device for hybrid vehicles.

[0074] In one embodiment, reference is made to Figure 3 , Figure 3 This is a schematic diagram of the functional modules of the energy-saving control device for the hybrid vehicle of this application. Figure 3 As shown, the energy-saving control device for hybrid vehicles includes a judgment module, a first execution module, and a second execution module.

[0075] The judgment module is used to determine the vehicle's usage needs during cold starts. If the need is for battery insulation, it drives the first execution module to work; if the need is for passenger compartment heating, it drives the second execution module to work. The first execution module is used to heat the battery based on the rate of decrease in ambient temperature, battery temperature, and engine operating status, using either battery self-heating mode or engine heat. The second execution module is used to heat the passenger compartment based on the remaining battery charge, vehicle driving time, and engine operating status, using either PTC heating mode, motor heat, or engine heat.

[0076] The functions of each module in the energy-saving control device of the hybrid vehicle mentioned above correspond to the steps in the embodiment of the energy-saving control method of the hybrid vehicle mentioned above, and their functions and implementation processes will not be described in detail here.

[0077] Thirdly, embodiments of this application provide an energy-saving control device for a hybrid vehicle. The energy-saving control device for a hybrid vehicle can be a personal computer (PC), a laptop computer, a server, or other device with data processing capabilities.

[0078] Reference Figure 4 , Figure 4 This is a schematic diagram of the hardware structure of the energy-saving control device for a hybrid vehicle involved in an embodiment of this application. In this embodiment, the energy-saving control device for the hybrid vehicle may include a processor, a memory, a communication interface, and a communication bus.

[0079] The communication bus can be of any type and is used to interconnect the processor, memory, and communication interface.

[0080] The communication interface includes input / output (I / O) interfaces, physical interfaces, and logical interfaces used for interconnecting components within the energy-saving control equipment of hybrid vehicles, as well as interfaces used for interconnecting the energy-saving control equipment of hybrid vehicles with other devices (such as other computing devices or user equipment). Physical interfaces can be Ethernet interfaces, fiber optic interfaces, ATM interfaces, etc.; user equipment can be displays, keyboards, etc.

[0081] Memory can be various types of storage media, such as random access memory (RAM), read-only memory (ROM), non-volatile RAM (NVRAM), flash memory, optical storage, hard disk, programmable ROM (PROM), erasable PROM (EPROM), electrically erasable PROM (EEPROM), etc.

[0082] The processor can be a general-purpose processor, which can call the energy-saving control program for the hybrid vehicle stored in the memory and execute the energy-saving control method for the hybrid vehicle provided in the embodiments of this application. For example, the general-purpose processor can be a central processing unit (CPU). The method executed when the energy-saving control program for the hybrid vehicle is called can be referred to in the various embodiments of the energy-saving control method for the hybrid vehicle of this application, and will not be repeated here.

[0083] Those skilled in the art will understand that Figure 4 The hardware structure shown does not constitute a limitation of this application and may include more or fewer components than shown, or combine certain components, or have different component arrangements.

[0084] Fourthly, embodiments of this application also provide a computer-readable storage medium.

[0085] The present application provides a computer-readable storage medium storing an energy-saving control program for a hybrid vehicle, wherein when the energy-saving control program for the hybrid vehicle is executed by a processor, it implements the steps of the energy-saving control method for the hybrid vehicle as described above.

[0086] The method implemented when the energy-saving control program of the hybrid vehicle is executed can be referred to in various embodiments of the energy-saving control method of the hybrid vehicle of this application, and will not be repeated here.

[0087] The terms "comprising" and "having," and any variations thereof, in the specification, claims, and accompanying drawings of this application are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or apparatus that includes a series of steps or units is not limited to the listed steps or units, but may optionally include steps or units not listed, or may optionally include other steps or units inherent to such process, method, product, or apparatus. The terms "first," "second," and "third," etc., are used to distinguish different objects, etc., and do not indicate a sequence, nor do they limit "first," "second," and "third" to different types.

[0088] In the description of the embodiments of this application, terms such as "exemplary," "for example," or "for instance" are used to indicate examples, illustrations, or explanations. Any embodiment or design described as "exemplary," "for example," or "for instance" in the embodiments of this application should not be construed as being more preferred or advantageous than other embodiments or designs. Specifically, the use of terms such as "exemplary," "for example," or "for instance" is intended to present the relevant concepts in a concrete manner.

[0089] In the description of the embodiments of this application, unless otherwise stated, " / " means "or". For example, A / B can mean A or B. The "and / or" in the text is merely a description of the relationship between related objects, indicating that there can be three relationships. For example, A and / or B can mean: A exists alone, A and B exist simultaneously, and B exists alone. In addition, in the description of the embodiments of this application, "multiple" means two or more.

[0090] In some processes described in the embodiments of this application, multiple operations or steps are included in a specific order. However, it should be understood that these operations or steps may not be executed in the order they appear in the embodiments of this application, or they may be executed in parallel. The sequence number of the operation is only used to distinguish different operations, and the sequence number itself does not represent any execution order. In addition, these processes may include more or fewer operations, and these operations or steps may be executed sequentially or in parallel, and these operations or steps may be combined.

[0091] Through the above description of the embodiments, those skilled in the art can clearly understand that the methods of the above embodiments can be implemented by means of software plus necessary general-purpose hardware platforms. Of course, they can also be implemented by hardware, but in many cases the former is a better implementation method. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, can be embodied in the form of a software product. This computer software product is stored in a storage medium (such as ROM / RAM, magnetic disk, optical disk) as described above, and includes several instructions to cause a terminal device to execute the methods described in the various embodiments of this application.

[0092] The above are merely preferred embodiments of this application and do not limit the patent scope of this application. Any equivalent structural or procedural transformations made using the content of this application's specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this application.

Claims

1. An energy-saving control method for a hybrid vehicle, characterized in that, The energy-saving control method for the hybrid vehicle includes: According to vehicle usage requirements under cold start conditions: Under the requirement of power battery insulation, based on the rate of decrease of ambient temperature, power battery temperature and engine operating status, the power battery self-heating mode or engine heat is used to heat the power battery. When the passenger compartment needs heating, the PTC heating mode, motor heat or engine heat can be used to achieve passenger compartment heating based on the remaining power of the power battery, vehicle driving time and engine working status. The cold start condition refers to the condition under which a vehicle is driven for the first time after being parked in a cold winter region. Under the cold start condition, the vehicle HMC collects the ambient temperature and power battery temperature in real time through temperature sensors and sends them to the vehicle controller. The vehicle controller then uses the ambient temperature, motor temperature, power battery temperature, engine coolant temperature and AC request signal to implement logical control for power battery heating and passenger compartment heating. Specifically, the method of using engine heat to heat the power battery is as follows: When the rate of decrease of ambient temperature is less than the set rate threshold and the power battery temperature is less than the set low temperature threshold, the vehicle controller will not send a PTC start signal, the power battery self-heating mode will not be activated, and after the vehicle high voltage is powered on, if the power battery charge is higher than the engine start threshold and the power battery charging conditions are met, the vehicle controller will send an engine start request signal. The engine controller will control the engine to start high idle speed or enter the power generation mode after the engine is warmed up. When the engine coolant temperature is higher than the preset temperature threshold, the high temperature coolant of the engine will be introduced into the inlet of the power battery cooling circulation system based on the four-way valve set at the outlet of the engine cooling circulation system to heat the power battery. When the power battery temperature reaches the normal operating temperature and the discharge power meets the vehicle's requirements, the vehicle controller controls the engine to shut down.

2. The energy-saving control method for a hybrid vehicle as described in claim 1, characterized in that, For the use of a self-heating mode for power battery heating, the specific details are as follows: When the rate of decrease of ambient temperature is greater than the set rate threshold and the power battery temperature is less than the set low temperature threshold, the vehicle controller sends a PTC activation signal to the BMS, and the power battery activates the self-heating mode. When the vehicle controller detects that the coolant temperature of the power battery is greater than the set high temperature threshold, or the power battery temperature is higher than the set temperature, the vehicle controller sends a signal to the BMS to turn off the PTC heating, and the power battery turns off the self-heating mode.

3. The energy-saving control method for a hybrid vehicle as described in claim 1, characterized in that: A fourth water pump is installed on the pipeline between the four-way valve and the water inlet of the power battery cooling circulation system. When the engine coolant temperature is higher than the preset temperature threshold, the high-temperature coolant of the engine needs to be introduced into the water inlet of the power battery cooling circulation system. The fourth water pump works and operates at maximum power. When the power battery temperature reaches the normal operating temperature and the discharge power meets the vehicle's requirements, the fourth water pump stops working when the vehicle controller controls the engine to stop.

4. The energy-saving control method for a hybrid vehicle as described in claim 1, characterized in that, For passenger cabin heating using PTC heating mode, motor heat, or engine heat, the specific methods are as follows: When the power battery charge is detected to be higher than the engine start threshold during vehicle operation, the vehicle controller receives the AC heating request signal and controls the PTC to turn on. At this time, the PTC heating mode is used to heat the passenger compartment. If the motor stator windings generate heat after the vehicle is in motion, requiring the motor to dissipate heat, the motor cooling circulation system will be activated and the power of the PTC will be reduced. Based on the three-way valve set at the outlet of the motor cooling circulation system, the high-temperature coolant will be introduced into the heater core. At this time, the PTC and the heat from the motor will work together to heat the passenger compartment. When the engine is running and the engine coolant temperature is higher than the preset temperature threshold, the vehicle controller shuts down the PTC and stops introducing the high-temperature coolant from the motor cooling circulation system to the heater core. Based on the four-way valve set at the outlet of the engine cooling circulation system, a portion of the high-temperature coolant from the engine is introduced into the heater core, and the heat from the engine is used to heat the passenger compartment.

5. The energy-saving control method for a hybrid vehicle as described in claim 4, characterized in that: A fifth water pump is installed on the pipeline between the water outlet of the motor cooling circulation system and the heater core. A second water pump is provided at the water inlet of the motor cooling circulation system; When the motor cooling circulation system is turned on and the power of the PTC is reduced, the high-temperature coolant is introduced into the warm air core by the three-way valve set at the outlet of the motor cooling circulation system, and the fifth and second water pumps are turned on. When the engine is running and the engine coolant temperature is higher than the preset temperature threshold, the vehicle controller sends a command signal to shut down the fifth water pump when the PTC is turned off.

6. An energy-saving control device for a hybrid vehicle, characterized in that, The energy-saving control device for the hybrid vehicle includes: The judgment module is used to determine the vehicle's usage needs during cold start conditions. If the need is for power battery insulation, the first execution module will be activated; if the need is for passenger compartment heating, the second execution module will be activated. The first execution module is used to heat the power battery by adopting the power battery self-heating mode or the engine heat based on the rate of decrease of ambient temperature, the power battery temperature and the engine operating status. The second execution module is used to heat the passenger compartment based on the remaining power battery charge, vehicle driving time, and engine operating status, using PTC heating mode, motor heat, or engine heat. The cold start condition refers to the condition under which a vehicle is driven for the first time after being parked in a cold winter region. Under the cold start condition, the vehicle HMC collects the ambient temperature and power battery temperature in real time through temperature sensors and sends them to the vehicle controller. The vehicle controller then uses the ambient temperature, motor temperature, power battery temperature, engine coolant temperature and AC request signal to implement logical control for power battery heating and passenger compartment heating. Specifically, the method of using engine heat to heat the power battery is as follows: When the rate of decrease of ambient temperature is less than the set rate threshold and the power battery temperature is less than the set low temperature threshold, the vehicle controller will not send a PTC start signal, the power battery self-heating mode will not be activated, and after the vehicle high voltage is powered on, if the power battery charge is higher than the engine start threshold and the power battery charging conditions are met, the vehicle controller will send an engine start request signal. The engine controller will control the engine to start high idle speed or enter the power generation mode after the engine is warmed up. When the engine coolant temperature is higher than the preset temperature threshold, the high temperature coolant of the engine will be introduced into the inlet of the power battery cooling circulation system based on the four-way valve set at the outlet of the engine cooling circulation system to heat the power battery. When the power battery temperature reaches the normal operating temperature and the discharge power meets the vehicle's requirements, the vehicle controller controls the engine to shut down.

7. An energy-saving control device for a hybrid vehicle, characterized in that, The energy-saving control device for the hybrid vehicle includes a processor, a memory, and an energy-saving control program for the hybrid vehicle stored in the memory and executable by the processor, wherein when the energy-saving control program for the hybrid vehicle is executed by the processor, it implements the steps of the energy-saving control method for the hybrid vehicle as described in any one of claims 1 to 5.

8. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores an energy-saving control program for a hybrid vehicle, wherein when the energy-saving control program for the hybrid vehicle is executed by a processor, it implements the steps of the energy-saving control method for a hybrid vehicle as described in any one of claims 1 to 5.

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