Method and device for controlling start and stop of engine of hybrid electric vehicle

Abstract

The invention relates to the field of hybrid electric vehicle control, and particularly provides a method and device for controlling start and stop of an engine of a hybrid electric vehicle. Determining whether the state information satisfies an engine start condition or an engine stop condition; when it is determined that the state information satisfies the engine start condition or the engine stop condition, a start or stop operation of the vehicle engine is controlled by the control unit. Through the method, the effect of reasonably controlling the start-stop process of the engine of the hybrid electric vehicle can be achieved.

Description

Technical Field

[0001] The present application relates to the field of hybrid vehicle control, and more particularly, to a method and device for controlling the start and stop of a hybrid vehicle engine. Background Art

[0002] With the increasing global attention to environmental protection standards and energy utilization efficiency, hybrid electric vehicles (HEVs) have been widely promoted due to their superior fuel economy and low emission characteristics. Hybrid electric vehicles typically combine an internal combustion engine with an electric motor and optimize power distribution through an intelligent control system. Under low-speed driving conditions such as in urban areas, hybrid electric vehicles usually use the electric motor to drive, thereby reducing gasoline consumption and emissions. In addition, engine start-stop technology has also been widely used to reduce fuel consumption and pollutant emissions when the vehicle is idling. In the prior art, most hybrid electric vehicles have an automatic start-stop function, which can automatically turn off the engine when the vehicle stops and quickly start it when acceleration is required again.

[0003] However, the current start-stop control technology has some obvious problems and limitations, which are mainly manifested in the following aspects: 1. Frequent start-stop leads to a decline in driving comfort: The existing start-stop control algorithms often rely on simple algorithmic logics, such as automatically turning off the engine when the vehicle is stationary, and easily ignore other driving conditions. This single control method results in frequent start-stop of the engine, which may cause obvious power delays after starting the vehicle, affecting the driver's driving experience. 2. Excessive wear and increased maintenance costs: Frequent start-stop increases the wear of the engine and its related components, resulting in an increased frequency of repair and replacement of components during long-term use, increasing maintenance and operating costs. The prior art fails to effectively consider the balance between the start-stop strategy and the engine life, thus conflicting with the overall performance and economy of the vehicle. 3. Insufficient energy management: The existing start-stop technology fails to fully consider the battery state and the energy demand of the driving environment when turning off and starting the vehicle, which may cause the power supply system to be unable to provide sufficient power at critical moments, affecting the performance and driving safety of the vehicle.

[0004] Therefore, how to reasonably control the start-stop process of a hybrid vehicle engine is a technical problem that needs to be solved. Summary of the Invention

[0005] An object of an embodiment of the present application is to provide a method for controlling the start and stop of a hybrid vehicle engine, and the technical solution of the embodiment of the present application can achieve the effect of reasonably controlling the start-stop process of a hybrid vehicle engine.

[0006] In a first aspect, an embodiment of the present application provides a method for controlling the start and stop of a hybrid vehicle engine, including obtaining the status information of the vehicle, where the status information includes at least one of vehicle speed, acceleration, braking state, engine speed, running time, battery state, and external environment parameters; determining whether the status information meets the engine start condition or the engine stop condition, where the engine start condition includes at least one of a charge state start condition, a vehicle speed start condition, a power start condition, a power start condition, and a heating start condition, and the engine stop condition includes that the engine running time is greater than the minimum running time control threshold; when it is determined that the status information meets the engine start condition or the engine stop condition, controlling the start or stop operation of the vehicle engine through a control unit.

[0007] In the above embodiment of the present application, aiming at the current status of the vehicle itself, the battery, the engine, and the external environment, the start and stop decision of the engine is optimized. When the status information meets the start and stop decision, the start and stop strategy is dynamically adjusted through the control unit to avoid unnecessary start and stop behaviors, extend the engine life, and achieve the effect of reasonably controlling the start and stop process of the hybrid vehicle engine.

[0008] In some embodiments, determining whether the status information meets the engine start condition or the engine stop condition includes: determining whether the status information meets the engine start condition; or determining whether the status information meets the engine stop condition.

[0009] In the above embodiment of the present application, it is possible to accurately determine whether the engine needs to start or stop according to the engine start condition or the stop condition.

[0010] In some embodiments, determining whether the status information meets the engine start condition includes: determining whether the status information meets the charge state start condition; and / or determining whether the status information meets the vehicle speed start condition; and / or determining whether the status information meets the power start condition; and / or determining whether the status information meets the power start condition; and / or determining whether the status information meets the heating start condition.

[0011] In the above embodiment of the present application, when at least one of the charge state start condition, the vehicle speed start condition, the power start condition, the power start condition, and the heating start condition is met, it can be determined that the engine starts.

[0012] In some embodiments, determining whether the status information meets the charge state start condition includes: dynamically adjusting the charge state limit value of the engine's power battery according to the current load power demand of the vehicle and the power recovery amount during regenerative braking; determining whether the battery state is greater than the charge state limit value of the power battery.

[0013] In the above embodiments of the present application, when it is determined whether the battery state is greater than the power battery state of charge limit, it can be timely determined as the engine starting state.

[0014] In some embodiments, determining whether the status information meets the vehicle speed starting condition includes: judging the running mode of the vehicle according to the battery state, where the running mode includes a power maintenance mode or a power consumption mode; determining the vehicle speed threshold according to the running mode; and determining whether the vehicle speed is greater than the vehicle speed threshold.

[0015] In the above embodiments of the present application, when it is determined whether the vehicle speed is greater than the vehicle speed threshold, it can be accurately determined as the engine starting state.

[0016] In some embodiments, determining whether the status information meets the power starting condition includes: determining whether the accelerator pedal opening is greater than the engine starting pedal opening limit or determining whether the current vehicle power is greater than the battery discharge power limit.

[0017] In the above embodiments of the present application, when it is determined whether the accelerator pedal opening is greater than the engine starting pedal opening limit or determining whether the current vehicle power is greater than the battery discharge power limit, it can be accurately determined as the engine starting state.

[0018] In some embodiments, determining whether the status information meets the power starting condition includes: judging the running mode of the vehicle according to the battery state, where the running mode includes a power maintenance mode or a power consumption mode; and determining whether the current vehicle total demand power in the running mode is greater than the engine starting power limit through a preset vehicle total demand power prediction model.

[0019] In the above embodiments of the present application, when it is determined whether the current vehicle total demand power is greater than the engine starting power limit, it can be accurately determined as the engine starting state.

[0020] In some embodiments, determining whether the status information meets the heating starting condition includes: determining whether the vehicle interior temperature is greater than the set temperature value.

[0021] In the above embodiments of the present application, when it is determined whether the status information meets the heating starting condition, it can be accurately determined as the engine starting state.

[0022] In some embodiments, determining whether the status information meets the engine shutdown condition includes: determining the first minimum running time of the engine according to the battery state of the engine battery and the target battery state of the battery; determining the second minimum running time of the engine according to the vehicle speed; selecting the maximum value between the first minimum running time and the second minimum running time as the minimum running time control threshold; and determining whether the running time of the engine is greater than the minimum running time control threshold.

[0023] In the above embodiments of the present application, when determining whether the running time of the engine is greater than the minimum running time control threshold, it can be accurately determined as an engine shutdown condition.

[0024] In a second aspect, an embodiment of the present application provides a device for controlling the start and stop of a hybrid vehicle engine, including:

[0025] An acquisition module, configured to acquire the state information of the vehicle, where the state information includes at least one of vehicle speed, acceleration, braking state, engine speed, running time, battery state, and external environment parameters;

[0026] A judgment module, configured to determine whether the state information meets the engine start condition or the engine shutdown condition, where the engine start condition includes at least one of a state of charge start condition, a vehicle speed start condition, a power start condition, a power start condition, and a heating start condition, and the engine shutdown condition includes: the running time of the engine is greater than the minimum running time control threshold;

[0027] A control module, configured to, when determining that the state information meets the engine start condition or the engine shutdown condition, control the start or shutdown operation of the vehicle engine through a control unit.

[0028] Optionally, the judgment module is specifically configured to:

[0029] Determine whether the state information meets the engine start condition;

[0030] Or

[0031] Determine whether the state information meets the engine shutdown condition.

[0032] Optionally, the judgment module is specifically configured to:

[0033] Determine whether the state information meets the state of charge start condition;

[0034] And / or

[0035] Determine whether the state information meets the vehicle speed start condition;

[0036] And / or

[0037] Determine whether the state information meets the power start condition;

[0038] And / or

[0039] Determine whether the state information meets the power start condition;

[0040] And / or

[0041] Determine whether the state information meets the heating start condition.

[0042] Optionally, the determination module is specifically configured to:

[0043] Dynamically adjust the state of charge limit of the power battery of the engine according to the current load power demand of the vehicle and the power recovery amount during regenerative braking;

[0044] Determine whether the battery state is greater than the state of charge limit of the power battery.

[0045] Optionally, the determination module is specifically configured to:

[0046] Judge the operation mode of the vehicle according to the battery state, where the operation mode includes a charge-sustaining mode or a charge-depleting mode;

[0047] Determine the vehicle speed threshold according to the operation mode;

[0048] Determine whether the vehicle speed is greater than the vehicle speed threshold.

[0049] Optionally, the determination module is specifically configured to:

[0050] Determine whether the accelerator pedal opening is greater than the engine starting pedal opening limit or determine whether the current vehicle power is greater than the battery discharge power limit.

[0051] Optionally, the determination module is specifically configured to:

[0052] Judge the operation mode of the vehicle according to the battery state, where the operation mode includes a charge-sustaining mode or a charge-depleting mode;

[0053] Determine whether the current vehicle's overall demand power in the operation mode is greater than the engine starting power limit through a preset overall vehicle demand power prediction model.

[0054] Optionally, the determination module is specifically configured to:

[0055] Determine whether the temperature inside the vehicle is greater than the set temperature value.

[0056] Optionally, the determination module is specifically configured to:

[0057] Determine the first minimum running time of the engine according to the battery state of the engine battery and the target battery state of the battery;

[0058] Determine the second minimum running time of the engine according to the vehicle speed;

[0059] Select the maximum value of the first minimum running time and the second minimum running time as the minimum running time control threshold;

[0060] Determine whether the running time of the engine is greater than the minimum running time control threshold.

[0061] In a third aspect, an embodiment of the present application provides an electronic device, including a processor and a memory. The memory stores computer-readable instructions. When the computer-readable instructions are executed by the processor, the steps in the method provided in the first aspect above are run.

[0062] In a fourth aspect, an embodiment of the present application provides a readable storage medium, on which a computer program is stored. When the computer program is executed by a processor, the steps in the method provided in the first aspect above are run.

[0063] Other features and advantages of the present application will be described in the subsequent specification, and, in part, will be obvious from the specification, or will be understood by implementing the embodiments of the present application. Description of the Drawings

[0064] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required to be used in the embodiments of the present application will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present application, and thus should not be regarded as a limitation of the scope. For those of ordinary skill in the art, other related drawings can be obtained based on these drawings without creative efforts.

[0065] Figure 1 It is a flowchart of a method for controlling the start and stop of a hybrid vehicle engine provided by an embodiment of the present application;

[0066] Figure 2 It is a flowchart of an implementation method for controlling the start and stop of a hybrid vehicle engine provided by an embodiment of the present application;

[0067] Figure 3 It is a schematic block diagram of a device for controlling the start and stop of a hybrid vehicle engine provided by an embodiment of the present application;

[0068] Figure 4 It is a structural schematic block diagram of a device for controlling the start and stop of a hybrid vehicle engine provided by an embodiment of the present application. Detailed Embodiments

[0069] Next, the technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. The components of the embodiments of the present application described and shown in the accompanying drawings here can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the claimed present application, but merely represents the selected embodiments of the present application. All other embodiments obtained by those skilled in the art based on the embodiments of the present application without creative efforts belong to the scope of protection of the present application.

[0070] It should be noted that similar reference numerals and letters indicate similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings. At the same time, in the description of the present application, terms such as "first" and "second" are only used for distinguishing descriptions and cannot be understood as indicating or implying relative importance.

[0071] First, some terms involved in the embodiments of the present application will be described to facilitate the understanding of those skilled in the art.

[0072] A hybrid vehicle is a vehicle in which the vehicle drive system is composed of two or more individual drive systems that can operate simultaneously, and the driving power of the vehicle is provided separately or jointly by the individual drive systems according to the actual driving state of the vehicle.

[0073] The present application is applied to the scenario of hybrid vehicle control. The specific scenario is to determine whether the engine meets the start-stop conditions based on the current state of the vehicle, the engine state, the environmental state, the battery state, etc., and control the start and stop of the engine according to the judgment result.

[0074] With the increasing global attention to environmental protection standards and energy utilization efficiency, hybrid electric vehicles (HEVs) have been widely promoted due to their superior fuel economy and low emission characteristics. Hybrid electric vehicles typically combine an internal combustion engine with an electric motor and optimize power distribution through an intelligent control system. Under low-speed driving conditions such as in urban areas, hybrid electric vehicles usually use the electric motor to drive, thereby reducing gasoline consumption and emissions. In addition, engine start-stop technology has also been widely applied to reduce fuel consumption and pollutant emissions when the vehicle is idling. In the prior art, most hybrid electric vehicles have an automatic start-stop function, which can automatically turn off the engine when the vehicle stops and quickly start it when acceleration is needed again. However, the current start-stop control technology has some obvious problems and limitations, mainly manifested in the following aspects: 1. Frequent start-stop leads to a decline in driving comfort: The existing start-stop control algorithms often rely on simple algorithmic logics, such as automatically turning off the engine when the vehicle is stationary, and tend to ignore other driving conditions. This single control method results in frequent engine start-stop, which may cause obvious power delays after starting the vehicle, affecting the driver's driving experience. 2. Excessive wear and increased maintenance costs: Frequent start-stop increases the wear of the engine and its related components, resulting in a higher frequency of repair and replacement of components during long-term use, increasing maintenance and operating costs. The prior art fails to effectively consider the balance between the start-stop strategy and the engine life, thus conflicting with the overall performance and economy of the vehicle. 3. Insufficient energy management: The existing start-stop technology does not fully consider the battery state and the energy demand of the driving environment when turning off and starting the vehicle, which may cause the power supply system to be unable to provide sufficient power at critical moments, affecting the performance and driving safety of the vehicle.

[0075] Therefore, this application obtains the state information of the vehicle, where the state information includes at least one of vehicle speed, acceleration, braking state, engine speed, running time, battery state, and external environment parameters; determines whether the state information meets the engine start condition or the engine stop condition, where the engine start condition includes at least one of state of charge start condition, vehicle speed start condition, power start condition, power start condition, and heating start condition, and the engine stop condition includes: the engine running time is greater than the minimum running time control threshold; when it is determined that the state information meets the engine start condition or the engine stop condition, the control unit controls the start or stop operation of the vehicle engine. Optimize the start-stop decision of the engine according to the current state of the vehicle itself, battery, engine, and external environment. When the state information meets the start-stop decision, the start-stop strategy is dynamically adjusted through the control unit to avoid unnecessary start-stop behaviors, extend the engine life, and achieve the effect of reasonably controlling the start-stop process of the hybrid electric vehicle engine.

[0076] In the embodiments of the present application, the execution entity may be a device for controlling the start-stop of a hybrid vehicle engine in a hybrid vehicle engine start-stop system. In practical applications, the device for controlling the start-stop of a hybrid vehicle engine may be an electronic device such as a terminal device and a server, which is not limited herein.

[0077] The following Figure 1 will describe in detail the method for controlling the start-stop of a hybrid vehicle engine according to the embodiments of the present application.

[0078] Please refer to Figure 1 , Figure 1 , which is a flowchart of a method for controlling the start-stop of a hybrid vehicle engine provided by an embodiment of the present application. As Figure 1 shown, the method for controlling the start-stop of a hybrid vehicle engine includes:

[0079] Step 110: Obtain the state information of the vehicle.

[0080] Among them, the state information includes at least one of vehicle speed, acceleration, braking state, engine speed, running time, battery state, and external environment parameters. It may also include vehicle running trajectory, external light intensity, accelerator pedal opening, and engine starting pedal opening, etc. The battery state includes state of charge of the battery and battery usage time, etc. The external environment parameters include temperature and humidity, etc.

[0081] Optionally, different state information can be obtained through different devices and methods. For example, the relevant state information of the vehicle, including vehicle speed, acceleration, braking state, engine speed, running time, battery state, etc., can be directly obtained through the vehicle controller. The external parameter environment can be obtained through sensors installed on the vehicle.

[0082] Step 120: Determine whether the state information meets the engine start condition or the engine stop condition.

[0083] Among them, the engine start conditions include at least one of the state of charge start condition, vehicle speed start condition, power start condition, power start condition, and heating start condition. The engine stop condition includes: the engine running time is greater than the minimum running time control threshold.

[0084] In some embodiments of the present application, determining whether the state information meets the engine start condition or the engine stop condition includes: determining whether the state information meets the engine start condition; or determining whether the state information meets the engine stop condition.

[0085] In the above process of the present application, it is possible to accurately determine whether the engine needs to start or stop according to the engine start condition or the stop condition.

[0086] In some embodiments of the present application, determining whether the status information meets the engine starting condition includes: determining whether the status information meets the state of charge starting condition; and / or determining whether the status information meets the vehicle speed starting condition; and / or determining whether the status information meets the power starting condition; and / or determining whether the status information meets the power starting condition; and / or determining whether the status information meets the heating starting condition.

[0087] In the above process of the present application, when at least one of the state of charge starting condition, vehicle speed starting condition, power starting condition, power starting condition, and heating starting condition is met, it can be determined that the engine starts.

[0088] In some embodiments of the present application, determining whether the status information meets the state of charge starting condition includes: dynamically adjusting the state of charge limit of the engine's power battery according to the current load power demand of the vehicle and the power recovery amount during regenerative braking; determining whether the battery state is greater than the state of charge limit of the power battery.

[0089] In the above process of the present application, when determining whether the battery state is greater than the state of charge limit of the power battery, it can be determined in a timely manner that the engine is in the starting state.

[0090] Specifically: Whether the battery state is greater than the state of charge limit of the power battery can be obtained in the following manner:

[0091] If SOC < SOCEngstart;

[0092] Among them, SOC represents the state of charge of the battery state, and SOCEngstart is the SOC limit of the power battery for engine starting (the state of charge limit of the power battery); SOCEngstart may not be a fixed value and can be dynamically adjusted according to the vehicle's load demand and the recovered energy of regenerative braking. When the load power is high (such as when the vehicle is climbing or accelerating), the SOC threshold SOCEngstart will be appropriately increased to start the engine for charging in advance to prevent the battery power from being too low. When the recovered power of regenerative braking is high, SOCEngstart will be reduced because the battery can obtain more energy through regenerative braking and does not need to start the engine for charging frequently. The dynamic adjustment formula of SOCEngstart can be described as:

[0093] SOC Engstart (t) = SOC base +k×(P load (t)-P regen (t))

[0094] Among them, SOC base is the basic SOC threshold, which is a fixed reference value. k is the adjustment coefficient, indicating the influence weight of the load power on the SOC threshold. Pload (t) The load power demand at the current moment, including two parts: driving power and accessory power. P regen (t) is the power recovery amount during regenerative braking.

[0095] In some embodiments of the present application, determining whether the status information meets the vehicle speed starting condition includes: judging the operation mode of the vehicle according to the battery state, where the operation mode includes a charge sustaining mode or a charge depleting mode; determining the vehicle speed threshold according to the operation mode; and determining whether the vehicle speed is greater than the vehicle speed threshold.

[0096] In the above process of the present application, when determining whether the vehicle speed is greater than the vehicle speed threshold, the engine starting state can be accurately determined.

[0097] Optionally, judging the operation mode of the vehicle according to the battery state. Determining the vehicle speed threshold according to the operation mode; determining whether the vehicle speed is greater than the vehicle speed threshold can be obtained by the following method:

[0098] If SOC < SOClow, the vehicle is in the charge sustaining mode (CS mode);

[0099] On the contrary, if SOC > SOClow, the vehicle is in the charge depleting mode (CD mode);

[0100] If currently in the charge depleting mode (CD mode):

[0101] VehicleSpeed > VehicleSpeed_Thr_CD, the engine starts;

[0102] If currently in the charge sustaining mode (CS mode):

[0103] VehicleSpeed > VehicleSpeed_Thr_CS, the engine starts;

[0104] Wherein, SOClow is the SOC threshold for the CD and CS mode switching of the vehicle, VehicleSpeed_Thr_CD is the vehicle speed threshold corresponding to the engine starting in the CD mode; VehicleSpeed_Thr_CS is the vehicle speed threshold corresponding to the engine starting in the CS mode;

[0105] In some embodiments of the present application, determining whether the status information meets the power starting condition includes: determining whether the accelerator pedal opening is greater than the engine starting pedal opening limit value or determining whether the current vehicle power is greater than the battery discharge power limit value.

[0106] During the above process of this application, when it is determined whether the accelerator pedal opening is greater than the engine starting pedal opening limit value or whether the current vehicle power is greater than the battery discharge power limit value, the engine starting state can be accurately determined.

[0107] Optionally, whether the accelerator pedal opening is greater than the engine starting pedal opening limit value or whether the current vehicle power is greater than the battery discharge power limit value can be obtained in the following manner:

[0108] The control logic of the power starter is as follows. If either of the following two conditions is met, the engine starts:

[0109] AccPedal>AccPedalEngstart or WhlDrvPow>BatPowlim;

[0110] Wherein, AccPedal is the accelerator pedal opening, AccPedalEngstart is the engine starting pedal opening threshold value, WhlDrvPow is the vehicle's total demand power, and BatPowlim is the allowable battery discharge power.

[0111] In some embodiments of this application, determining whether the status information meets the power starting condition includes: judging the vehicle's operation mode according to the battery status, wherein the operation mode includes the charge sustaining mode or the charge depleting mode; determining whether the current vehicle's total demand power in the operation mode is greater than the engine starting power limit value through a preset vehicle total demand power prediction model.

[0112] During the above process of this application, when the current vehicle's total demand power is greater than the engine starting power limit value, the engine starting state can be accurately determined.

[0113] Optionally: determining whether the current vehicle's total demand power in the operation mode is greater than the engine starting power limit value through a preset vehicle total demand power prediction model can be obtained in the following manner:

[0114] Power starting condition:

[0115] First, judge the current mode of the vehicle. The judgment conditions are the same as above and will not be elaborated here.

[0116] If the current is in the charge depleting mode (CD mode):

[0117] Judge whether the current vehicle's total demand power is greater than the starting power threshold;

[0118] If the vehicle's total demand power P demand > the starting power threshold, the engine starts;

[0119] The above starting power threshold is a two-dimensional MAP table of vehicle speed and SOC, as shown in Table 1. The values in the table are for illustration only, and the specific values should be calibrated.

[0120] Table 1

[0121] Vehicle speed / SOC 15 25 26 45 50 65 75 80 90 10 75 75 75 100 150 150 150 150 150 20 75 75 75 100 150 150 150 150 150 30 75 75 75 100 150 150 150 150 150 50 75 75 75 100 150 150 150 150 150 73 15 15 75 100 150 150 150 150 150 90 15 15 75 100 150 150 150 150 150 110 15 15 75 100 150 150 150 150 150 130 15 15 75 100 150 150 150 150 150 150 15 15 75 100 150 150 150 150 150 170 15 15 75 100 150 150 150 150 150

[0122] If the current is in the charge sustaining mode (CS mode):

[0123] Similarly, it is determined whether the current vehicle power demand is greater than the starting power threshold;

[0124] If the vehicle power demand P demand > the starting power threshold, the engine starts

[0125] The above starting power threshold is also a two-dimensional MAP table of vehicle speed and SOC, as shown in Table 2. The values in the table are for illustration only, and the specific values should be calibrated.

[0126] Table 2

[0127]

[0128] When the intelligent energy management is enabled, the VCU can predict future operating conditions information based on the navigation, and can establish a vehicle power demand prediction model according to the future vehicle speed information, which can be expressed as:

[0129] P demand (t) = P drive (v(t), a(t), θ(t)) + P aux ;

[0130] Among them, P demand (t) is the predicted value of the vehicle power demand in the time period from t to t + Δt. P drive (v(t), a(t), θ(t)) is the driving power, which depends on the vehicle speed v(t), acceleration a(t) and road slope θ(t). P aux is the fixed power demand of the accessory system, such as the sum of the power demands of entertainment, lighting, etc.

[0131] In some embodiments of the present application, determining whether the status information meets the heating start condition includes: determining whether the vehicle interior temperature is greater than the set temperature value.

[0132] In the above process of the present application, when determining whether the status information meets the heating start condition, the engine starting state can be accurately determined.

[0133] Among them, it can also be determined whether the humidity inside and outside the vehicle is greater than the set temperature value to determine whether the heating start condition is met, and the set temperature value and humidity value can be set according to requirements.

[0134] Optionally, determining whether the status information meets the heating start-up condition can be obtained in the following manner:

[0135] If the temperature inside the vehicle is detected to be lower than the set value Tlow, in order to ensure the normal operation of the heating in the passenger compartment, the engine will remain in the starting state.

[0136] In some embodiments of the present application, determining whether the status information meets the engine shutdown condition includes: determining the first minimum running time of the engine according to the battery state and the target battery state of the engine battery; determining the second minimum running time of the engine according to the vehicle speed; selecting the maximum value between the first minimum running time and the second minimum running time as the minimum running time control threshold; determining whether the running time of the engine is greater than the minimum running time control threshold.

[0137] In the above process of the present application, when determining whether the running time of the engine is greater than the minimum running time control threshold, it can be accurately determined as the engine shutdown condition.

[0138] Optionally, when determining whether the running time of the engine is greater than the minimum running time control threshold and it can be accurately determined as the engine shutdown condition, it can be obtained in the following manner:

[0139] (1) The minimum running time of the engine is controlled according to the battery SOC;

[0140] Determine the minimum running time EngTimeLim1 of the engine by looking up the MAP table according to the difference between the current battery SOC and the target battery SOC; the MAP table is shown in Table 3;

[0141] △SOC = SOC(t) - SOCTar;

[0142] Where, △SOC is the difference between the current battery SOC and the target battery SOC at the current moment, SOC(t) is the current battery SOC at the current moment, and SOCTar is the target battery SOC;

[0143] Table 3 MAP table for determining the minimum running time of the engine based on the SOC difference

[0144]

[0145] (2) The minimum running time of the engine is controlled according to the current driving speed;

[0146] Determine the minimum running time EngTimeLim2 of the engine by looking up the MAP table according to the current vehicle speed; the MAP table is shown in Table 4;

[0147] Table 4 MAP table for determining the minimum running time of the engine based on the vehicle speed

[0148]

[0149] Combining (1) and (2), the minimum running time control threshold of the engine is set to the larger value of the two, expressed as:

[0150] EngTimeLim = max(EngTimeLim1, EngTimeLim2);

[0151] In summary, when the engine starts timing after starting, if the engine running time EngTime > EngTimeLim, the engine meets the shutdown condition at this time.

[0152] Step 130: When it is determined that the status information meets the engine start condition or the engine shutdown condition, the control unit controls the start or stop operation of the vehicle engine.

[0153] Among them, the control unit can be the vehicle engine controller.

[0154] Optionally, controlling the start or stop operation of the vehicle engine by the control unit includes the vehicle hybrid vehicle engine start-stop control system analyzing whether the status information meets the engine start condition or the engine shutdown condition, and then judging the start or stop of the vehicle engine, and controlling the start or stop operation of the vehicle engine by the controller.

[0155] Among them, the hybrid vehicle engine start-stop control system includes a sensor module: used to collect real-time data of the vehicle, such as vehicle speed, acceleration, battery state (SOC), engine speed, driver operations (throttle, brake), etc. Control unit: The core part includes a vehicle demand power calculation module and an engine start-stop decision module. Actuator: Controls engine start-stop and motor operation.

[0156] In the above Figure 1In the process shown, this application obtains the status information of the vehicle, where the status information includes at least one of vehicle speed, acceleration, braking state, engine speed, running time, battery state, and external environment parameters; determines whether the status information meets the engine start condition or the engine stop condition, where the engine start condition includes at least one of the state of charge start condition, vehicle speed start condition, power start condition, power start condition, and heating start condition, and the engine stop condition includes: the engine running time is greater than the minimum running time control threshold; when it is determined that the status information meets the engine start condition or the engine stop condition, the control unit is used to control the start or shutdown operation of the vehicle engine. Optimize the start-stop decision of the engine according to the current status of the vehicle itself, battery, engine, and external environment. When the status information meets the start-stop decision, the start-stop strategy is dynamically adjusted through the control unit to avoid unnecessary start-stop behaviors, extend the engine life, and achieve the effect of reasonably controlling the start-stop process of the hybrid vehicle engine.

[0157] The following combines Figure 2 to describe in detail the implementation method for controlling the start-stop of the hybrid vehicle engine in the embodiments of this application.

[0158] Please refer to Figure 2 , Figure 2 which is a flowchart of an implementation method for controlling the start-stop of the hybrid vehicle engine provided by the embodiments of this application. As Figure 2 shown, the implementation method for controlling the start-stop of the hybrid vehicle engine includes:

[0159] Step 210: Obtain the vehicle status information.

[0160] Specifically: Obtain at least one of the vehicle speed, acceleration, braking state, engine speed, running time, battery state, and external environment parameters of the vehicle.

[0161] Step 220: Judge the engine start condition.

[0162] Specifically: Judge whether the engine meets at least one of the state of charge start condition, vehicle speed start condition, power start condition, power start condition, and heating start condition.

[0163] Step 230: Judge the engine stop condition.

[0164] Specifically: Judge whether the engine running time is greater than the minimum running time control threshold.

[0165] Step 240: Output control information to the engine management unit to execute the start or shutdown of the engine.

[0166] Specifically: when it is determined that the status information meets the engine start condition or the engine stop condition, a control signal is sent to the engine management unit, and the engine management unit controls the control unit to control the start or stop operation of the vehicle engine.

[0167] In addition, Figure 2 The specific methods and steps shown can be referred to Figure 1 the method shown, and will not be elaborated here too much.

[0168] Previously, Figure 1 - Figure 2 described the method for controlling the start and stop of the hybrid vehicle engine. Next, in combination with Figure 3 - Figure 4 describe the device for controlling the start and stop of the hybrid vehicle engine.

[0169] Please refer to Figure 3 , which is a schematic block diagram of a device 300 for controlling the start and stop of a hybrid vehicle engine provided in an embodiment of the present application. The device 300 can be a module, a program segment or code on an electronic device. The device 300 corresponds to the above Figure 1 method embodiment and can execute Figure 1 each step involved in the method embodiment. The specific functions of the device 300 can be seen in the following description. To avoid repetition, the detailed description is appropriately omitted here.

[0170] Optionally, the device 300 includes:

[0171] An acquisition module 310, configured to acquire the status information of the vehicle, where the status information includes at least one of vehicle speed, acceleration, braking state, engine speed, running time, battery state, and external environment parameters;

[0172] A judgment module 320, configured to determine whether the status information meets the engine start condition or the engine stop condition, where the engine start condition includes at least one of a state of charge start condition, a vehicle speed start condition, a power start condition, a power start condition, and a heating start condition, and the engine stop condition includes: the engine running time is greater than the minimum running time control threshold;

[0173] A control module 330, configured to, when it is determined that the status information meets the engine start condition or the engine stop condition, control the start or stop operation of the vehicle engine through the control unit.

[0174] Optionally, the judgment module is specifically configured to:

[0175] Determine whether the status information meets the engine start condition; or determine whether the status information meets the engine stop condition.

[0176] Optionally, the judgment module is specifically configured to:

[0177] Determine whether the status information meets the starting condition of the state of charge; and / or determine whether the status information meets the starting condition of the vehicle speed; and / or determine whether the status information meets the starting condition of the power; and / or determine whether the status information meets the starting condition of the power; and / or determine whether the status information meets the starting condition of heating.

[0178] Optionally, the judgment module is specifically configured to:

[0179] Dynamically adjust the state of charge limit value of the power battery of the engine according to the current load power demand of the vehicle and the power recovery amount during regenerative braking; determine whether the battery state is greater than the state of charge limit value of the power battery.

[0180] Optionally, the judgment module is specifically configured to:

[0181] Judge the operation mode of the vehicle according to the battery state, where the operation mode includes a charge-sustaining mode or a charge-depleting mode; determine the vehicle speed threshold according to the operation mode; determine whether the vehicle speed is greater than the vehicle speed threshold.

[0182] Optionally, the judgment module is specifically configured to:

[0183] Determine whether the accelerator pedal opening is greater than the engine starting pedal opening limit value or determine whether the current vehicle power is greater than the battery discharge power limit value.

[0184] Optionally, the judgment module is specifically configured to:

[0185] Judge the operation mode of the vehicle according to the battery state, where the operation mode includes a charge-sustaining mode or a charge-depleting mode; determine whether the current vehicle total demand power in the operation mode is greater than the engine starting power limit value through a preset vehicle total demand power prediction model.

[0186] Optionally, the judgment module is specifically configured to:

[0187] Determine whether the temperature inside the vehicle is greater than the set temperature value.

[0188] Optionally, the judgment module is specifically configured to:

[0189] Determine the first minimum running time of the engine according to the battery state of the engine battery and the target battery state of the battery; determine the second minimum running time of the engine according to the vehicle speed; select the maximum value of the first minimum running time and the second minimum running time as the minimum running time control threshold; determine whether the running time of the engine is greater than the minimum running time control threshold.

[0190] Please refer to Figure 4The structural schematic block diagram of a device for controlling the start and stop of a hybrid vehicle engine provided in an embodiment of the present application. The device may include a memory 410 and a processor 420. Optionally, the device may further include: a communication interface 430 and a communication bus 440. The device corresponds to the above Figure 1 method embodiment and is capable of executing Figure 1 each step involved in the method embodiment. The specific functions of the device can be referred to the description below.

[0191] Specifically, the memory 410 is used to store computer-readable instructions.

[0192] The processor 420 is used to process the readable instructions stored in the memory and is capable of executing Figure 1 each step in the method.

[0193] The communication interface 430 is used to communicate signaling or data with other node devices. For example: used for communication with a server or a terminal, or for communication with other device nodes. The embodiments of the present application are not limited thereto.

[0194] The communication bus 440 is used to realize the direct connection and communication of the above components.

[0195] Among them, the communication interface 430 of the device in the embodiment of the present application is used to communicate signaling or data with other node devices. The memory 410 may be a high-speed RAM memory or a non-volatile memory, such as at least one disk memory. Optionally, the memory 410 may further be at least one storage device located far from the aforementioned processor. The memory 410 stores computer-readable instructions. When the computer-readable instructions are executed by the processor 420, the electronic device executes the above Figure 1 shown method process. The processor 420 may be used on the device 300 and is used to execute the functions in the present application. Exemplarily, the above processor 420 may be a general-purpose processor, a digital signal processor (DSP), an application specific integrated circuit (ASIC), a field programmable gate array (FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components. The embodiments of the present application are not limited thereto.

[0196] The embodiment of the present application further provides a readable storage medium. When the computer program is executed by the processor, it executes the method process executed by the electronic device in the Figure 1 shown method embodiment.

[0197] Those skilled in the art can clearly understand that for the convenience and brevity of description, the specific working process of the above-described device can refer to the corresponding process in the foregoing method, and will not be elaborated herein too much.

[0198] In summary, the embodiments of the present application provide a method and a device for controlling the start and stop of a hybrid vehicle engine. The method includes obtaining the state information of the vehicle, where the state information includes at least one of vehicle speed, acceleration, braking state, engine speed, running time, battery state, and external environment parameters; determining whether the state information meets the engine start condition or the engine stop condition, where the engine start condition includes at least one of a state of charge start condition, a vehicle speed start condition, a power start condition, a power start condition, and a heating start condition, and the engine stop condition includes that the engine running time is greater than the minimum running time control threshold; when it is determined that the state information meets the engine start condition or the engine stop condition, controlling the start or stop operation of the vehicle engine through a control unit. Through this method, the effect of reasonably controlling the start and stop process of the hybrid vehicle engine can be achieved.

[0199] In several embodiments provided by the present application, it should be understood that the disclosed device and method can also be implemented in other ways. The device embodiments described above are merely illustrative. For example, the flowcharts and block diagrams in the accompanying drawings show the possible architectures, functions, and operations of devices, methods, and computer program products according to multiple embodiments of the present application. In this regard, each block in the flowchart or block diagram may represent a module, a program segment, or a part of code, and the module, program segment, or part of code contains one or more executable instructions for implementing the specified logical function. It should also be noted that in some alternative implementations, the functions marked in the blocks may occur in a different order than marked in the accompanying drawings. For example, two consecutive blocks may actually be executed substantially in parallel, and they may sometimes be executed in the reverse order, depending on the functions involved. It should also be noted that each block in the block diagram and / or flowchart, as well as the combination of blocks in the block diagram and / or flowchart, can be implemented by a dedicated hardware-based system for performing the specified functions or actions, or can be implemented by a combination of dedicated hardware and computer instructions.

[0200] In addition, each functional module in various embodiments of the present application may be integrated together to form an independent part, or each module may exist separately, or two or more modules may be integrated to form an independent part.

[0201] When the above-mentioned functions are implemented in the form of software function modules and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, or a part of this technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the methods described in various embodiments of this application. The aforementioned storage medium includes: various media such as USB flash drives, mobile hard disks, read-only memories (ROM, Read-Only Memory), random access memories (RAM, Random Access Memory), magnetic disks, or optical discs that can store program codes.

[0202] The above are only the embodiments of this application and are not used to limit the protection scope of this application. For those skilled in the art, this application can have various changes and modifications. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of this application shall be included in the protection scope of this application. It should be noted that similar reference numerals and letters denote similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0203] As described above, this is only the specific implementation manner of this application, but the protection scope of this application is not limited thereto. Any person skilled in the art can easily think of changes or replacements within the technical scope disclosed in this application, and all should be covered by the protection scope of this application.

[0204] It should be noted that in this text, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not expressly listed, or further includes elements inherent to such process, method, article or device. Without further limitations, an element defined by the statement "including a..." does not exclude the existence of additional identical elements in the process, method, article or device including the said element.

Claims

1. A method for controlling the start and stop of a hybrid vehicle engine, characterized in that, Including: Obtaining the status information of the vehicle, where the status information includes at least one of vehicle speed, acceleration, braking state, engine speed, running time, battery state, and external environment parameters; Determining whether the status information meets the engine start condition or the engine stop condition, where the engine start condition includes at least one of a state of charge start condition, a vehicle speed start condition, a power start condition, a power start condition, and a heating start condition, and the engine stop condition includes: the engine running time is greater than the minimum running time control threshold; When it is determined that the status information meets the engine start condition or the engine stop condition, controlling the start or stop operation of the vehicle engine through a control unit.

2. The method according to claim 1, wherein The determining whether the status information meets the engine start condition or the engine stop condition includes: Determining whether the status information meets the engine start condition; Or Determining whether the status information meets the engine stop condition.

3. The method according to claim 2, characterized in that The determining whether the status information meets the engine start condition includes: Determining whether the status information meets the state of charge start condition; And / or Determining whether the status information meets the vehicle speed start condition; And / or Determining whether the status information meets the power start condition; And / or Determining whether the status information meets the power start condition; And / or Determining whether the status information meets the heating start condition.

4. The method according to claim 3, characterized in that, Determining whether the status information meets the state of charge start condition includes: Dynamically adjusting the state of charge limit value of the engine's power battery according to the current load power demand of the vehicle and the power recovery amount during regenerative braking; Determining whether the battery state is greater than the state of charge limit value of the power battery.

5. The method according to claim 3, characterized in that, The determining whether the status information meets the vehicle speed start condition includes: Judging the running mode of the vehicle according to the battery state, where the running mode includes a charge-sustaining mode or a charge-depleting mode; Determining the vehicle speed threshold according to the running mode; Determining whether the vehicle speed is greater than the vehicle speed threshold.

6. The method according to claim 3, characterized in that, The determining whether the status information meets the power start condition includes: Determining whether the accelerator pedal opening is greater than the engine start pedal opening limit value or determining whether the current vehicle power is greater than the battery discharge power limit value.

7. The method according to claim 3, characterized in that, The determining whether the status information meets the power start condition includes: Judging the running mode of the vehicle according to the battery state, where the running mode includes a charge-sustaining mode or a charge-depleting mode; Determining whether the current vehicle's overall demand power in the running mode is greater than the engine start power limit value through a preset overall vehicle demand power prediction model.

8. The method according to claim 3, wherein The determining whether the status information meets the heating start condition includes: Determining whether the vehicle interior temperature is greater than the set temperature value.

9. The method according to claim 2, wherein The determining whether the status information meets the engine stop condition includes: Determining the first minimum running time of the engine according to the battery state of the engine battery and the target battery state of the battery; Determine the second minimum running time of the engine according to the vehicle speed of the vehicle; Select the maximum value of the first minimum running time and the second minimum running time as the minimum running time control threshold; Determine whether the running time of the engine is greater than the minimum running time control threshold.

10. A device for controlling the start and stop of a hybrid vehicle engine, characterized in that, Comprising: An acquisition module, configured to acquire the status information of the vehicle, where the status information includes at least one of vehicle speed, acceleration, braking state, engine speed, running time, battery state, and external environment parameters; A judgment module, configured to determine whether the status information meets the engine start condition or the engine stop condition, where the engine start condition includes at least one of a state of charge start condition, a vehicle speed start condition, a power start condition, a power start condition, and a heating start condition, and the engine stop condition includes: the engine running time is greater than the minimum running time control threshold; A control module, configured to, when it is determined that the status information meets the engine start condition or the engine stop condition, control the start or stop operation of the vehicle engine through a control unit.

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