Quick cold start control method and system of range extender and hybrid vehicle

Abstract

The invention provides a rapid cold start control method and system for a range extender and a hybrid vehicle. The technical problems that in the prior art, cold start of the range extender is difficult and start is slow at the extremely low environment temperature are solved. According to the rapid cold start control method for the range extender, at least one component of the range extender is heated according to the current environment temperature, when the component is heated to the preset heating threshold value, the heating control device is used for conducting air inlet heating on the interior of the engine compartment, and then the rotating speed of the motor is controlled to reach the preset motor reverse dragging rotating speed; and after the rotating speed of the engine reaches the preset rotating speed and is stabilized for a period of time, it is determined that the engine is started successfully, so that the purpose of conducting rapid cold start on the range extender in the low-temperature environment is achieved, and it is ensured that the range extender has the rapid cold start capacity at the extremely low environment temperature; and the power generation capacity of the vehicle is quickly established, so that the power demand of the whole vehicle is ensured.

Description

Technical Field

[0001] The present application relates to the technical field of range-extended electric vehicles, and specifically relates to a rapid cold start control method and system for a range extender and a hybrid vehicle. Background Art

[0002] The cold start control of the range extender of a hybrid vehicle faces many technical challenges in extremely low ambient temperatures. In a low-temperature environment, problems such as increased engine oil viscosity, poor fuel atomization effect, and decreased battery performance will all lead to difficulties in starting the range extender. In addition, low temperature will also affect the combustion efficiency of the engine, making it difficult for the engine to quickly reach a stable operating state. To solve these problems, in the prior art, an on-vehicle heater and intake heating are used to assist the starter to start. However, due to the low heating efficiency of the on-vehicle heater and intake heating device in a low-temperature environment, it takes a long time to reach the temperature required for starting, resulting in difficult and slow cold start of the range extender in extremely low ambient temperatures. Summary of the Invention

[0003] In view of this, the present application provides a rapid cold start control method and system for a range extender and a hybrid vehicle, which solves the technical problems of difficult and slow cold start of the range extender in extremely low ambient temperatures, and achieves the technical effect of ensuring that the range extender has the ability of rapid cold start in extremely low ambient temperatures, ensuring that the vehicle can quickly establish power generation capacity, and thus ensuring the power consumption requirements of the whole vehicle.

[0004] To achieve the above object, the present application provides the following technical solution: A rapid cold start control method for a range extender, which is applicable to a rapid cold start device. The rapid cold start device includes: a heating system, an intake heating control device in the engine compartment, and a plurality of heating pipelines. The heating system heats the corresponding components through the heating pipelines, wherein the heating pipelines include electric control valves; wherein, the control method includes: collecting the temperatures of a plurality of components of the range extender at the current ambient temperature; when the current ambient temperature meets the cold start working condition, controlling at least one of the plurality of electric control valves to close to heat at least one of the plurality of components, and when the component is heated to a preset heating threshold, opening the intake heating control device to heat the air intake in the engine compartment for a preset heating duration; controlling the reverse drag speed of the motor to be a preset motor reverse drag speed and maintaining the preset motor reverse drag speed for a first preset duration; when the output torque of the motor is a negative torque after the motor maintains the preset motor reverse drag speed for the first preset duration, generating an engine ignition success message; detecting the speed of the engine, and when the speed of the engine rises to a preset speed and maintains the preset speed for a second preset duration, generating an engine start success message.

[0005] In an embodiment of the present application, multiple components include a fuel tank, a battery, and an engine; wherein, the heating pipeline corresponding to the fuel tank includes a third electric control valve, the heating pipeline corresponding to the battery includes a second electric control valve, and the heating pipeline corresponding to the engine includes a first electric control valve; wherein, the temperatures of the multiple components at least include the coolant temperature of the engine, the fuel temperature in the fuel tank, and the cell temperature of the battery; wherein, when the current ambient temperature meets the cold start condition, at least one of the multiple electric control valves is controlled to close to heat at least one of the multiple components, and when the component is heated to a preset heating threshold, based on opening the intake air heating control device, the intake air in the engine compartment is heated for a preset heating duration, including: when the current ambient temperature is lower than the first threshold and higher than the second threshold, controlling the heating system to turn on, and controlling the first electric control valve to open, disconnecting the second electric control valve and the third electric control valve, so that the heating system heats the coolant of the engine; when the coolant temperature of the engine is higher than the first heating threshold, opening the intake air heating control device to heat the intake air in the engine compartment for a preset heating duration.

[0006] In an embodiment of the present application, when the current ambient temperature meets the cold start condition, at least one of the multiple electric control valves is controlled to close to heat at least one of the multiple components, and when the component is heated to a preset heating threshold, based on opening the intake air heating control device, the intake air in the engine compartment is heated for a preset heating duration, further including: when the current ambient temperature is lower than the second threshold and higher than the third threshold, controlling the heating system to turn on, and controlling the first electric control valve and the second electric control valve to open, disconnecting the third electric control valve, so that the heating system heats the coolant of the engine and the cells of the battery; when the cell temperature of the battery is higher than the second heating threshold, opening the intake air heating control device to heat the intake air in the engine compartment for a preset heating duration.

[0007] In an embodiment of the present application, when the current ambient temperature meets the cold start condition, at least one of the multiple electric control valves is controlled to close to heat at least one of the multiple components, and when the component is heated to a preset heating threshold, based on opening the intake air heating control device, the intake air in the engine compartment is heated for a preset heating duration, further including: when the current ambient temperature is lower than the third threshold, controlling the heating system to turn on, and controlling the first electric control valve, the second electric control valve, and the third electric control valve to open, so that the heating system heats the coolant of the engine, the cells of the battery, and the fuel in the fuel tank; when the fuel temperature in the fuel tank is higher than the third heating threshold, opening the intake air heating control device to heat the intake air in the engine compartment for a preset heating duration.

[0008] In an embodiment of the present application, when the motor maintains a preset motor reverse drag speed for a first preset duration and the output torque of the motor is a positive torque, the reverse drag speed of the motor is increased.

[0009] In an embodiment of the present application, if the reverse-dragging speed value of the boosting motor is increased and the engine fails to ignite successfully within a preset reverse-dragging duration, the motor is controlled to exit the state of reverse-dragging the engine, and the preset reverse-dragging duration is set based on the current ambient temperature.

[0010] In an embodiment of the present application, if the speed of the engine decreases and stops running, an engine start failure message is generated.

[0011] As a second aspect of the present application, the present application further provides a fast cold start control system for a range extender, including: a fast cold start device, the fast cold start device includes: a heating system, an intake air heating control device in the engine compartment, and a plurality of heating pipelines. The heating system heats the corresponding components through the heating pipelines, wherein the heating pipelines include electric control valves; a controller, and the controller is used to execute the fast cold start control method for a range extender according to any one of the above.

[0012] In an embodiment of the present application, the plurality of components include a fuel tank, a battery, and an engine; wherein, the heating pipeline corresponding to the fuel tank includes a third electric control valve, the heating pipeline corresponding to the battery includes a second electric control valve, and the heating pipeline corresponding to the engine includes a first electric control valve.

[0013] As a third aspect of the present application, the present application further provides a hybrid vehicle, including: a range extender, the range extender includes an engine and a motor, and the power output shaft of the engine is connected to the power input shaft of the motor; a battery, the motor is connected to the battery; and the above fast cold start control system.

[0014] The fast cold start control method for a range extender provided by the present application heats at least one component of the range extender according to the current ambient temperature, and when the component is heated to a preset heating threshold, the intake air in the engine compartment is heated by the heating control device, and then the motor speed is controlled to reach a preset motor reverse-dragging speed to drive the engine to rotate. After the speed of the engine reaches the preset speed and stabilizes for a period of time, it is determined that the engine starts successfully, so as to achieve the purpose of quickly cold starting the range extender in a low temperature environment, solve the technical problem that the range extender is difficult to cold start and starts slowly in an extremely low ambient temperature, and achieve the technical effect of ensuring that the range extender has the ability to quickly cold start in an extremely low ambient temperature, ensuring that the vehicle quickly establishes the power generation ability, and thus ensuring the power consumption demand of the whole vehicle. Description of the Drawings

[0015] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only the embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained according to the provided drawings without creative efforts.

[0016] Figure 1 This is a working block diagram of a hybrid vehicle provided by an embodiment of the present application.

[0017] Figure 2 The figure shows a schematic diagram of a fast cold start device for a range extender provided by an embodiment of the present application.

[0018] Figure 3 The figure shows a schematic flow diagram of a fast cold start control method for a range extender provided by an embodiment of the present application.

[0019] Figure 4 The figure shows a schematic flow diagram of a fast cold start control logic for a range extender provided by an embodiment of the present application.

[0020] Figure 5 The figure shows a schematic flow diagram of a heating coordination control logic provided by an embodiment of the present application.

[0021] Figure 6 The figure shows a schematic diagram of a fast cold start control system for a range extender provided by an embodiment of the present application. Detailed implementation manners

[0022] The technical solution of the embodiment of the present application is applicable to the application scenario of fast cold start of hybrid vehicles. The hybrid vehicle can be a passenger vehicle or a commercial vehicle. Figure 1 The figure shows a working block diagram of a hybrid vehicle provided by an embodiment of the present application. As Figure 1 shown, the hybrid vehicle includes:

[0023] A power battery 300, an engine 100, a motor 200, and a driving element 400. Among them, the power output shaft of the engine 100 and the power output shaft of the motor 200 are connected to the driving element 400 to drive the driving element 400 to move. The engine 100 is connected to the motor 200. The motor 200 converts the kinetic energy transmitted by the engine 100 into electrical energy and stores the electrical energy in the power battery 300 to charge the power battery 300. During the operation of the hybrid vehicle, the following three driving modes can be adopted to drive the driving element 400 to move:

[0024] (1) The driving element 400 can be driven in a pure electric drive mode, that is, only the power battery 300 is used as the power source. The motor 200 converts the electrical energy transmitted by the power battery 300 into kinetic energy to drive the driving element 400 to move. The required driving torque for driving the driving element 400 to move is equal to the driving torque output by the power output shaft of the motor 200.

[0025] (2) The driving element 400 can be driven in a pure engine driving mode, that is, only the engine 100 is used as the power source. The engine 100 drives the driving element 400 to move, and the required driving torque for driving the driving element 400 to move is equal to the driving torque output by the power output shaft of the engine 100.

[0026] (3) The driving element 400 can be driven in a hybrid driving mode, that is, the engine 100 and the power battery 300 are used as power sources to jointly drive the driving element 400 to move. The required driving torque for driving the driving element 400 to move is equal to the sum of the driving torque output by the power output shaft of the motor 200 and the driving torque output by the power output shaft of the engine 100.

[0027] During the operation of the vehicle in the above driving mode, the cold start control of the range extender in extremely low environments faces many technical challenges. In a low-temperature environment, problems such as increased oil viscosity, poor fuel atomization effect, and decreased battery performance will all lead to difficult starting of the range extender. In addition, low temperature will also affect the combustion efficiency of the engine, making it difficult for the engine to quickly reach a stable operating state. To solve these problems, in the prior art, an on-vehicle heater and intake heating are used to assist the starter to start. However, due to the low heating efficiency of the on-vehicle heater and intake heating device in a low-temperature environment, it takes a long time to reach the temperature required for starting, resulting in difficult and slow cold start of the range extender in extremely low ambient temperatures.

[0028] After research, the inventors of this application propose: heating at least one component of the range extender according to the current ambient temperature, and when the component is heated to a preset heating threshold, using a heating control device to heat the intake air in the engine compartment, and then controlling the motor speed to reach a preset motor reverse-dragging speed to drive the engine to rotate. After the engine speed reaches the preset speed and stabilizes for a period of time, it is determined that the engine starts successfully, so as to achieve the purpose of quickly cold-starting the range extender in a low-temperature environment, solve the technical problem of difficult and slow cold start of the range extender in extremely low ambient temperatures, and achieve the technical effect of ensuring that the range extender has the ability to quickly cold start in extremely low ambient temperatures, ensuring that the vehicle can quickly establish a power generation capacity, and thus ensuring the power consumption requirements of the whole vehicle.

[0029] Next, the technical solutions in the embodiments of the present application will be described clearly and completely with reference to 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 of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present application.

[0030] As the first aspect of the present application, the present application provides a rapid cold start control method for a range extender, which is applicable to a rapid cold start device. The rapid cold start device includes: a heating system, an intake air heating control device in the engine compartment, and a plurality of heating pipelines. The heating system heats the corresponding components through the heating pipelines, wherein the heating pipelines include electric control valves.

[0031] Figure 2 The following shows a schematic diagram of a rapid cold start device for a range extender provided by an embodiment of the present application. As Figure 2 shown, the above-mentioned heating system includes a circulation pump and a heater (water boiler). The above-mentioned intake air heating control device in the engine compartment corresponds to an intake air heating grille. The above-mentioned plurality of heating pipelines include an engine pipeline, a battery pipeline, and a fuel tank pipeline. Among them, the engine pipeline includes an engine water temperature sensor for detecting the engine temperature, an engine, and an electric control valve 1 for controlling the conduction of the engine pipeline. The battery pipeline includes a battery temperature sensor for detecting the battery temperature, a battery, a battery temperature control system, and an electric control valve 2 for controlling the conduction of the battery pipeline. The fuel tank pipeline includes a fuel temperature sensor for detecting the fuel temperature, a fuel tank, and an electric control valve 3 for controlling the conduction of the fuel tank pipeline.

[0032] Figure 3 The following shows a flowchart of a rapid cold start control method for a range extender provided by an embodiment of the present application. As Figure 3 shown, the rapid cold start control method for the range extender includes the following steps:

[0033] S1, collect the temperatures of a plurality of components of the range extender at the current ambient temperature;

[0034] Specifically, the above-mentioned range extender is a device that can provide additional electric energy for an electric vehicle. It usually consists of an engine and a generator. The engine drives the generator to operate, thereby generating electric energy. This part of the electric energy can be directly provided for the drive motor on the vehicle or stored in the power battery.

[0035] The above-mentioned current ambient temperature can be used to represent the temperature information of the range extender in the current environment. Since the present application needs to perform a cold start on the range extender, the current ambient temperature can be -45°C or -30°C, etc. The current ambient temperature is not specifically limited herein.

[0036] The above-mentioned plurality of components include a fuel tank, a battery, and an engine.

[0037] In an optional embodiment, during the rapid cold start process of the range extender, it is necessary to collect the temperatures of a plurality of components of the range extender at the current ambient temperature, and at the same time adopt different heating strategies in combination with the current ambient temperature, so that the engine in the range extender can be quickly started at the current ambient temperature.

[0038] During the process of collecting the temperatures of multiple components of the range extender at the current ambient temperature, temperature collection can be performed based on temperature sensors. That is, multiple temperature sensors are arranged on the key components of the range extender (such as the engine block, intake system, coolant channel, etc.) to comprehensively monitor the temperature distribution.

[0039] S2. When the current ambient temperature meets the cold start condition, control at least one of the multiple electronic control valves to close to heat at least one of the multiple components, and when the component is heated to the preset heating threshold, open the intake air heating control device to heat the intake air in the engine compartment for a preset heating duration.

[0040] Specifically, the above cold start condition can be used to represent different heating methods adopted when the current ambient temperature meets different temperature conditions. Exemplarily, when the current ambient temperature meets the first temperature condition, a first heating method is performed to heat at least one component; when the current ambient temperature meets the second temperature condition, a second heating method is performed to heat at least one component; when the current ambient temperature meets the third temperature condition, a third heating method is performed to heat at least one component, and so on.

[0041] The above preset heating threshold can be used to represent the heating threshold corresponding to each component preset based on the current ambient temperature. Since there are differences in the functions and compositions of each component, the preset heating thresholds corresponding to each component are also different. Here, no specific setting is made for the preset heating threshold, and it can be adaptively adjusted according to the current ambient temperature.

[0042] The above preset heating duration can be used to represent the duration of heating the intake air in the engine compartment preset based on the current ambient temperature. It can be 10 minutes or 15 minutes. Here, no specific setting is made for the preset heating duration, and it can be adaptively adjusted according to the current ambient temperature.

[0043] In an optional embodiment, when the current ambient temperature meets the cold start condition, different heating methods need to be adopted based on different temperature conditions met by the current ambient temperature. The heating method is to control at least one of the multiple electronic control valves to close to heat at least one of the multiple components, and when the component is heated to the preset heating threshold, open the intake air heating control device to heat the intake air in the engine compartment for a preset heating duration.

[0044] Exemplarily, based on the above examples, when the current ambient temperature meets the first temperature condition, at least one component is heated to perform the first heating method. The first heating method can be to heat one of the fuel tank, battery, and engine to a preset heating threshold, and then turn on the intake heating control device to heat the engine compartment for a preset heating duration; when the current ambient temperature meets the second temperature condition, at least one component is heated to perform the second heating method. The second heating method can be to heat two of the fuel tank, battery, and engine to a preset heating threshold, and then turn on the intake heating control device to heat the engine compartment for a preset heating duration; when the current ambient temperature meets the third temperature condition, at least one component is heated to perform the third heating method. The third heating method can be to heat the fuel tank, battery, and engine to a preset heating threshold, and then turn on the intake heating control device to heat the engine compartment for a preset heating duration.

[0045] S3. Control the reverse drag speed of the motor to be the preset motor reverse drag speed and maintain the preset motor reverse drag speed for the first preset duration.

[0046] Specifically, in a low-temperature environment, the oil viscosity of the engine increases and the starting resistance increases. Traditional starting methods (such as starters) may have difficulty quickly starting the engine. At this time, motor reverse drag can provide greater torque and more stable speed to help the engine quickly reach the required speed for starting. During the process of using the rotational power of the motor to drive the engine to rotate, it usually works in coordination through a certain mechanical connection (such as a clutch, gear set, or direct connection). When the engine needs to start, the motor can operate as a motor, using its rotational power to drive the engine to rotate through a mechanical transmission device (such as a gear set) until the engine reaches a sufficient speed and starts successfully.

[0047] The above-mentioned preset motor reverse drag speed can be used to represent the reverse drag speed of the motor preset based on the current ambient temperature. It can be 300 rpm or 400 rpm. Here, the preset motor reverse drag speed is not specifically set and can be adaptively adjusted according to the current ambient temperature.

[0048] The above-mentioned first preset duration can be used to represent the duration for which the motor maintains the preset motor reverse drag speed. Generally, it can be 30 s or 40 s. Here, the first preset duration is not specifically set and needs to be adjusted according to the actual situation.

[0049] In an alternative embodiment, when heating the at least one component to a preset heating threshold, the intake air heating control device is turned on to heat the intake air in the engine compartment for a preset heating duration, and then the engine can be ignited. That is, in a low-temperature environment, the rotational power of the motor is required to drive the engine to rotate. Specifically, the reverse-dragging speed of the motor is controlled to be a preset reverse-dragging speed of the motor, and at the same time, it is observed whether the motor maintains the preset reverse-dragging speed for a first preset duration. If the motor does not maintain the preset reverse-dragging speed for the first preset duration, it means that the motor maintaining the preset reverse-dragging speed is not very stable and further observation is needed, or the motor speed needs to be increased and further observation is made.

[0050] S4. When the motor maintains the preset reverse-dragging speed of the motor for the first preset duration and the output torque of the motor is a negative torque, an engine ignition success message is generated.

[0051] Specifically, when the motor reverse-drags the engine, the motor outputs a positive torque to drive the engine to rotate. However, when the engine speed reaches a certain value, the output torque of the motor will gradually decrease until it becomes a negative torque. The appearance of the negative torque means that the motor switches from the driving state to the power generation state. At this time, the motor no longer provides power, but generates electricity through the inertia of the engine or the kinetic energy of the vehicle, and converts mechanical energy into electrical energy and stores it in the battery. Therefore, it can be judged whether the engine ignition is successful by the positive and negative of the motor output torque.

[0052] In an alternative embodiment, if the motor maintains the preset reverse-dragging speed of the motor for the first preset duration and the output torque of the motor is a negative torque, an engine ignition success message is generated, that is, it is determined that the engine ignition is successful; if the motor maintains the preset reverse-dragging speed of the motor for the first preset duration and the output torque of the motor is a positive torque, it means that the motor is still in the engine reverse-dragging working condition and the current engine speed has not reached a certain value, then it is determined that the engine ignition fails.

[0053] S5. Detect the engine speed. When the engine speed rises to a preset speed and maintains the preset speed for a second preset duration, an engine start success message is generated.

[0054] Specifically, the above-mentioned preset speed can be used to represent the preset engine idle speed. Generally, the engine idle speed is usually about 600 - 800 rpm, which is the lowest speed at which the engine can operate stably. In a hybrid power system, the idle target speed will be dynamically adjusted according to specific working conditions (such as battery state, vehicle load, etc.), and the preset speed is not specifically limited here.

[0055] In an alternative embodiment, the motor gradually adjusts its output torque during the reverse towing process until the engine speed reaches the idle speed requirement. At this time, the output torque of the motor may gradually decrease or even become negative torque (i.e., the motor enters the power generation state) to maintain the stable idle speed of the engine.

[0056] The above-mentioned second preset duration can be used to represent the duration for which the engine maintains the preset speed. Generally, it can be 5 s or 10 s. The first preset duration is not specifically set here and needs to be adjusted according to the actual situation.

[0057] In an alternative embodiment, after the engine is successfully ignited, the engine speed can be collected. When the engine speed rises to the preset speed, it is determined whether the engine maintaining the preset speed meets the second preset duration. If the engine maintaining the preset speed meets the second preset duration, it indicates that the engine speed is stable, and an engine start success message can be generated; if the engine maintaining the preset speed does not meet the second preset duration, it indicates that the engine speed is not yet stable enough and needs to be observed continuously. If necessary, the cold start working condition can be re-entered for judgment.

[0058] Figure 4 The figure shows a schematic flow chart of a fast cold start control logic for a range extender provided in an embodiment of the present application. As Figure 4 shown, the fast cold start control logic of the range extender includes the following steps:

[0059] Step S401, collect the temperature information of each component;

[0060] That is, collect the current ambient temperature information, coolant temperature, fuel temperature, battery temperature, etc.

[0061] Step S402, determine whether the current ambient temperature meets the cold start working condition. If the current ambient temperature does not meet the cold start working condition, the range extender starts normally; if the current ambient temperature meets the cold start working condition, execute step S403;

[0062] Step S403, heating coordination control module;

[0063] Control at least one of the multiple electronic control valves to close to heat at least one of the multiple components, and when the component is heated to the preset heating threshold, open the intake air heating control device to heat the engine compartment for a preset heating duration.

[0064] Step S404, motor reverse towing speed based on the ambient temperature;

[0065] That is, control the reverse towing speed of the motor to be the preset motor reverse towing speed and maintain the preset motor reverse towing speed for the first preset duration.

[0066] Step S405, engine ignition judgment. If the engine ignites successfully, execute Step S407; if the engine fails to ignite successfully, execute Step S406. If the engine still fails to ignite successfully after a certain period of time, jump to Step S402;

[0067] Step S406, increase the reverse towing speed;

[0068] That is, increase the reverse towing speed of the motor.

[0069] Step S407, engine start success judgment. If the engine starts successfully, it is determined that the cold start is successful; if the engine fails to start successfully, jump to Step S402.

[0070] The rapid cold start control method of the range extender provided by the present application heats at least one component of the range extender according to the current ambient temperature, and when the component is heated to a preset heating threshold, uses the heating control device to heat the intake air in the engine compartment, and then controls the motor speed to reach the preset motor reverse towing speed to drive the engine to rotate. After the engine speed reaches the preset speed and stabilizes for a period of time, it is determined that the engine starts successfully, so as to achieve the purpose of rapidly cold starting the range extender in a low-temperature environment, solve the technical problems of difficult and slow cold start of the range extender in an extremely low ambient temperature, and achieve the technical effect of ensuring that the range extender has the ability of rapid cold start in an extremely low ambient temperature, ensuring that the vehicle can quickly establish the power generation ability, and thus ensuring the power consumption requirements of the whole vehicle.

[0071] When the current ambient temperature meets the cold start working condition, different heating methods need to be adopted based on different temperature conditions met by the current ambient temperature. The present application exemplarily gives different heating methods adopted when the current ambient temperature meets three different temperature conditions respectively. However, it should be noted that it is not limited to three different temperature conditions here, and it can also be multiple temperature conditions other than three. The following is a detailed description of different heating methods adopted when the current ambient temperature meets three different temperature conditions respectively:

[0072] In an embodiment of the present application, multiple components include a fuel tank, a battery, and an engine; wherein, the heating pipeline corresponding to the fuel tank includes a third electric control valve, the heating pipeline corresponding to the battery includes a second electric control valve, and the heating pipeline corresponding to the engine includes a first electric control valve; wherein, the temperatures of the multiple components at least include the coolant temperature of the engine, the fuel temperature in the fuel tank, and the cell temperature of the battery; wherein, when the current ambient temperature meets the cold start condition, at least one of the multiple electric control valves is controlled to close to heat at least one of the multiple components, and when the component is heated to a preset heating threshold, the intake air heating control device is turned on based on this to perform intake air heating in the engine compartment for a preset heating duration, including: when the current ambient temperature is lower than the first threshold and higher than the second threshold, the heating system is controlled to turn on, and the first electric control valve is controlled to open, while the second electric control valve and the third electric control valve are disconnected, so that the heating system heats the coolant of the engine; when the coolant temperature of the engine is greater than the first heating threshold, the intake air heating control device is turned on to perform intake air heating in the engine compartment for a preset heating duration.

[0073] Specifically, both the above-mentioned first threshold and second threshold are preset ambient temperatures, and the second threshold is less than the first threshold.

[0074] The heating method adopted when the current ambient temperature meets the first temperature condition is as follows:

[0075] Figure 5 The figure shows a schematic flow chart of a heating coordination control logic provided by an embodiment of the present application. As Figure 5 shown, the heating coordination control logic includes the following steps:

[0076] Step S501, the heating coordination control module inputs: the current ambient temperature, fuel temperature, coolant temperature, battery temperature, etc.;

[0077] Step S502, determine whether the current ambient temperature is lower than the first threshold. If the current ambient temperature is lower than the first threshold, then execute step S503; if the current ambient temperature is not lower than the first threshold, then perform intake air heating based on the heating duration of the ambient temperature. After the heating duration ends, the heating coordination control ends;

[0078] Step S503, determine whether the current ambient temperature is lower than the second threshold. If the current ambient temperature is not lower than the second threshold, then execute step S504;

[0079] Step S504, turn on the heater, circulating water pump, and electric control valve 1 to heat the engine coolant;

[0080] Step S504a: Determine whether the coolant temperature is greater than the first heating threshold. If the coolant temperature is greater than the first heating threshold, perform intake air heating based on the heating duration corresponding to the ambient temperature. After the heating duration ends, the heating coordination control ends. If the coolant temperature is not greater than the first heating threshold, jump to step S504.

[0081] Among them, performing intake air heating based on the heating duration corresponding to the ambient temperature means opening the intake air heating control device to perform intake air heating in the engine compartment for a preset heating duration.

[0082] In an alternative embodiment, when the current ambient temperature is lower than the first threshold and greater than the second threshold, control the heating system (i.e., the circulation pump and the heater (water boiler) in Figure 2 ) to turn on, and control the first electromagnetic valve (i.e., the electromagnetic valve 1 in Figure 2 ) to turn on, and disconnect the second electromagnetic valve (i.e., the electromagnetic valve 2 in Figure 2 ) and the third electromagnetic valve (i.e., the electromagnetic valve 3 in Figure 2 ) so that the heating system heats the coolant of the engine; when the coolant temperature of the engine is greater than the first heating threshold, open the intake air heating control device (i.e., the intake air heating grille in Figure 2 ) to perform intake air heating in the engine compartment for a preset heating duration.

[0083] In an embodiment of the present application, when the current ambient temperature meets the cold start working condition, control at least one of the multiple electromagnetic valves to close to heat at least one of the multiple components, and when the component is heated to the preset heating threshold, based on opening the intake air heating control device to perform intake air heating in the engine compartment for a preset heating duration. It further includes: when the current ambient temperature is lower than the second threshold and greater than the third threshold, control the heating system to turn on, and control the first electromagnetic valve and the second electromagnetic valve to turn on, and disconnect the third electromagnetic valve so that the heating system heats the coolant of the engine and the battery cells; when the temperature of the battery cells is greater than the second heating threshold, open the intake air heating control device to perform intake air heating in the engine compartment for a preset heating duration.

[0084] Specifically, the above-mentioned third threshold is also a preset ambient temperature, and the third threshold is less than the second threshold.

[0085] The heating method adopted when the current ambient temperature meets the second temperature condition is as follows:

[0086] As Figure 5 shown, it includes the following steps:

[0087] Step S501: The heating coordination control module inputs: the current ambient temperature, fuel temperature, coolant temperature, battery temperature, etc.

[0088] Step S502: Determine whether the current temperature environment is lower than the first threshold. If the current temperature environment is lower than the first threshold, execute Step S503; if the current temperature environment is not lower than the first threshold, perform intake air heating based on the heating duration corresponding to the ambient temperature. After the heating duration ends, the heating coordination control ends.

[0089] Step S503: Determine whether the current temperature environment is lower than the second threshold. If the current temperature environment is lower than the second threshold, execute Step S505.

[0090] Step S505: Determine whether the current temperature environment is lower than the third threshold. If the current temperature environment is not lower than the third threshold, execute Step S506.

[0091] Step S506: Turn on the heater, the circulation water pump, and Electric Control Valves 1 and 2 to heat the engine coolant and the battery cells.

[0092] Step S506a: Determine whether the temperature of the battery cells is greater than the second heating threshold. If the temperature of the battery cells is greater than the second heating threshold, perform intake air heating based on the heating duration corresponding to the ambient temperature. After the heating duration ends, the heating coordination control ends; if the temperature of the battery cells is not greater than the second heating threshold, jump to Step S506.

[0093] Among them, performing intake air heating based on the heating duration corresponding to the ambient temperature means turning on the intake air heating control device to perform intake air heating in the engine compartment for a preset heating duration.

[0094] In an alternative embodiment, when the current ambient temperature is lower than the second threshold and greater than the third threshold, control the heating system (i.e., the circulation pump and the heater (water boiler) in Figure 2 ), turn on the first electric control valve (i.e., Electric Control Valve 1 in Figure 2 ), and the second electric control valve (i.e., Electric Control Valve 2 in Figure 2 ), and turn off the third electric control valve (i.e., Electric Control Valve 3 in Figure 2 ) so that the heating system heats the engine coolant and the battery cells; when the temperature of the battery cells is greater than the second heating threshold, turn on the intake air heating control device (i.e., the intake air heating grille in Figure 2 ) to perform intake air heating in the engine compartment for a preset heating duration.

[0095] In an embodiment of the present application, when the current ambient temperature meets the cold start condition, at least one of the multiple electronically controlled valves is controlled to close to heat at least one of the multiple components, and when the component is heated to a preset heating threshold, the intake heating control device is turned on based on this to perform intake heating in the engine compartment for a preset heating duration. It further includes: when the current ambient temperature is lower than a third threshold, the heating system is controlled to turn on, and the first electronically controlled valve, the second electronically controlled valve, and the third electronically controlled valve are controlled to turn on, so that the heating system heats the coolant of the engine, the battery cells, and the fuel in the fuel tank; when the fuel temperature in the fuel tank is greater than a third heating threshold, the intake heating control device is turned on to perform intake heating in the engine compartment for a preset heating duration.

[0096] Specifically, the heating method adopted when the current ambient temperature meets the third temperature condition is as follows:

[0097] As Figure 5 shown, it includes the following steps:

[0098] Step S501, the heating coordination control module inputs: the current ambient temperature, fuel temperature, coolant temperature, battery temperature, etc.;

[0099] Step S502, determine whether the current temperature environment is lower than a first threshold. If the current temperature environment is lower than the first threshold, execute step S503; if the current temperature environment is not lower than the first threshold, perform intake heating based on the heating duration of the ambient temperature, and after the heating duration ends, the heating coordination control ends;

[0100] Step S503, determine whether the current temperature environment is lower than a second threshold. If the current temperature environment is lower than the second threshold, execute step S505;

[0101] Step S505, determine whether the current temperature environment is lower than a third threshold. If the current temperature environment is lower than the third threshold, execute step S507;

[0102] Step S507, turn on the heater, circulating water pump, and electronically controlled valves 1, 2, and 3 to heat the engine coolant, battery cells, and fuel;

[0103] Step S507a, determine whether the fuel temperature in the fuel tank is greater than a third heating threshold. If the fuel temperature is greater than the third heating threshold, perform intake heating based on the heating duration of the ambient temperature, and after the heating duration ends, the heating coordination control ends; if the fuel temperature is not greater than the second heating threshold, jump to step S507.

[0104] Among them, performing intake heating based on the heating duration of the ambient temperature means turning on the intake heating control device to perform intake heating in the engine compartment for a preset heating duration.

[0105] In an alternative embodiment, when the current ambient temperature is lower than a third threshold, the heating system (i.e., the circulation pump and the heater (water boiler) in Figure 2 ) is controlled to be turned on, and the first electronic control valve (i.e., the electronic control valve 1 in Figure 2 ), the second electronic control valve (i.e., the electronic control valve 2 in Figure 2 ), and the third electronic control valve (i.e., the electronic control valve 3 in Figure 2 ) are controlled to be turned on, so that the heating system heats the coolant of the engine, the battery cells, and the fuel in the fuel tank; when the fuel temperature in the fuel tank is greater than a third heating threshold, the intake heating control device (i.e., the intake heating grille in Figure 2 ) is turned on to perform intake heating in the engine compartment for a preset heating duration.

[0106] In an embodiment of the present application, when the motor maintains a preset motor reverse drag speed for a first preset duration and the output torque of the motor is a positive torque, the reverse drag speed of the motor is increased.

[0107] Specifically, if the motor maintains a preset motor reverse drag speed for a first preset duration and the output torque of the motor is a positive torque, it indicates that the engine has not reached a stable idle speed (usually 600 - 800 rpm), and the motor may need to continue to provide positive torque to maintain the increase in the engine speed. At this time, the mechanical loss torque of the engine (such as the friction between the piston ring and the cylinder wall, the friction of the valve mechanism, etc.) may still be greater than the torque provided by the motor, resulting in the output torque of the motor still being positive. In order to convert the output torque of the motor into a negative torque, the reverse drag speed of the motor can be increased. After the reverse drag speed of the motor is increased, the output torque of the motor can be re - judged, and then it can be determined whether the engine ignites successfully.

[0108] In an embodiment of the present application, if the engine still fails to ignite successfully within a preset reverse drag duration after increasing the reverse drag speed value of the motor, the motor is controlled to exit the state of reverse - dragging the engine, and the preset reverse drag duration is set based on the current ambient temperature.

[0109] Specifically, if the engine still fails to ignite successfully within a preset reverse drag duration after increasing the reverse drag speed value of the motor, it indicates that there may be other fault problems. It may be that the mechanical connection between the motor and the engine may have insufficient rigidity or transmission efficiency problems. To ensure that the range extender is not damaged, the motor can be controlled to exit the state of reverse - dragging the engine to avoid damaging the engine by dragging the engine for a long time. At this time, it can jump to the cold - start working condition judgment state and re - enter a new start cycle.

[0110] In an embodiment of the present application, if the engine speed drops and stops running, an engine start - failure message is generated.

[0111] Specifically, after the engine ignition is successful, if the engine speed drops and the engine stops running, it indicates that there may be an increase in the viscosity of the fuel, a deterioration in the atomization effect, resulting in poor mixture quality and incomplete combustion. This will cause the output power of the engine to be insufficient and it is difficult to maintain idling. It is determined that the engine startup fails, and the cold start condition judgment can be re-entered, the cold start heating coordination control module can be confirmed again, and the engine can be restarted.

[0112] As a second aspect of the present application, the present application also provides a rapid cold start control system for a range extender. Figure 6 The following shows a schematic diagram of a rapid cold start control system for a range extender provided by an embodiment of the present application. As Figure 6 shown, the rapid cold start control system 6 includes: a rapid cold start device 61 and a controller 62. Among them, the rapid cold start device includes: a heating system, an intake air heating control device in the engine compartment, and a plurality of heating pipelines. The heating system heats the corresponding components through the heating pipelines, where the heating pipelines include electric control valves; the controller is used to execute the rapid cold start control method for a range extender according to any one of the above.

[0113] In an embodiment of the present application, the plurality of components include a fuel tank, a battery, and an engine; among them, the heating pipeline corresponding to the fuel tank includes a third electric control valve, the heating pipeline corresponding to the battery includes a second electric control valve, and the heating pipeline corresponding to the engine includes a first electric control valve.

[0114] The rapid cold start control method for a range extender provided by the present application heats at least one component of the range extender according to the current ambient temperature, and when the component is heated to a preset heating threshold, uses the heating control device to heat the intake air in the engine compartment, and then controls the motor speed to reach a preset motor reverse drag speed to drive the engine to rotate. After the engine speed reaches the preset speed and stabilizes for a period of time, it is determined that the engine startup is successful, so as to achieve the purpose of rapidly cold starting the range extender in a low temperature environment, solve the technical problem of difficult and slow cold start of the range extender in an extremely low ambient temperature, and achieve the technical effect of ensuring that the range extender has the ability to rapidly cold start in an extremely low ambient temperature, ensuring that the vehicle can quickly establish the power generation ability, and thus ensuring the electrical power demand of the whole vehicle.

[0115] The method in the present application can be implemented in whole or in part by software, hardware, firmware, or any combination thereof. When implemented using software, it can be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer programs or instructions. When the computer program or instructions are loaded and executed on a computer, the processes or functions described in the present application are executed in whole or in part. The computer can be a general-purpose computer, a special-purpose computer, a computer network, a network device, a user device, a core network device, an OAM, or other programmable devices.

[0116] The computer program product can be written in any combination of one or more programming languages for executing the program code of the operations of the embodiments of the present application. The programming languages include object-oriented programming languages such as Java, C++, etc., and also include conventional procedural programming languages such as the "C" language or similar programming languages. The program code can be executed entirely on the user computing device, partially on the user device, executed as an independent software package, partially on the user computing device and partially on a remote computing device, or entirely on a remote computing device or server.

[0117] The computer program or instruction can be stored in a computer-readable storage medium, or transmitted from one computer-readable storage medium to another computer-readable storage medium. For example, the computer program or instruction can be transmitted from one website, computer, server, or data center to another website, computer, server, or data center in a wired or wireless manner. The computer-readable storage medium can be any available medium accessible by a computer or a data storage device such as a server or data center integrating one or more available media. The available medium can be a magnetic medium, such as a floppy disk, hard disk, or magnetic tape; it can also be an optical medium, such as a digital video disc; or it can be a semiconductor medium, such as a solid-state drive. The computer-readable storage medium can be a volatile or non-volatile storage medium, or can include both volatile and non-volatile types of storage media.

[0118] In addition, an embodiment of the present application can also be a storage medium on which a computer program is stored, and the computer program is executed by a processor to perform the steps in the method for quickly cold-starting control of a range extender described in any of the above embodiments of this specification.

[0119] For the foregoing method embodiments, for the sake of simple description, they are all expressed as a series of action combinations. However, those skilled in the art should know that the present application is not limited by the described action sequence, because according to the present application, certain steps can be performed in other sequences or simultaneously. Secondly, those skilled in the art should also know that the embodiments described in the specification are all preferred embodiments, and the actions and modules involved are not necessarily essential to the present application.

[0120] It should be noted that the embodiments in this specification are all described in a progressive manner. Each embodiment focuses on the differences from other embodiments. The same or similar parts among the embodiments can be referred to each other. For the device embodiments, since they are basically similar to the method embodiments, the description is relatively simple, and the relevant parts can be referred to the partial description of the method embodiments.

[0121] The steps in the methods of the embodiments of the present application can be adjusted, combined, and deleted according to actual needs. The technical features described in each embodiment can be replaced or combined. The devices in the embodiments of the present application can be combined, divided, and deleted according to actual needs.

[0122] Those skilled in the art can further realize that the units and algorithm steps of each example described in combination with the embodiments disclosed herein can be implemented by electronic hardware, computer software, or a combination of both. To clearly illustrate the interchangeability of hardware and software, the composition and steps of each example have been generally described according to functions in the above description. Whether these functions are executed in a hardware or software manner depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementation should not be considered to exceed the scope of the present application.

[0123] The steps of the methods or algorithms described in combination with the embodiments disclosed herein can be directly implemented by hardware, software units executed by a processor, or a combination of both. The software units can be placed in a random access memory (RAM), internal memory, read-only memory (ROM), electrically programmable ROM, electrically erasable programmable ROM, registers, hard disk, removable disk, CD-ROM, or any other form of storage medium well-known in the technical field.

[0124] Finally, it should also be noted that in this document, 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 comprising a series of elements not only includes those elements, but also includes other elements not expressly listed, or elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "comprising a..." does not exclude the existence of additional identical elements in the process, method, article or device comprising the element.

[0125] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present application. Various modifications to these embodiments will be obvious to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to these embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A rapid cold start control method for a range extender, characterized in that, The control method is applicable to a rapid cold start device, which includes a heating system, an intake air heating control device in the engine compartment, and multiple heating pipelines. The heating system heats corresponding components through the heating pipelines, where the heating pipelines include electric control valves; Among them, the control method includes: Collect the temperatures of multiple components of the range extender at the current ambient temperature; When the current ambient temperature meets the cold start condition, control at least one of the multiple electric control valves to close to heat at least one of the multiple components, and when the component is heated to a preset heating threshold, open the intake air heating control device to heat the intake air in the engine compartment for a preset heating duration; Control the reverse drag speed of the motor to a preset motor reverse drag speed and maintain the preset motor reverse drag speed for a first preset duration; When the motor maintains the preset motor reverse drag speed for the first preset duration and the output torque of the motor is a negative torque, generate an engine ignition success message; Detect the speed of the engine. When the speed of the engine rises to a preset speed and maintains the preset speed for a second preset duration, generate an engine start success message.

2. The control method according to claim 1, wherein The multiple components include a fuel tank, a battery, and an engine; among them, the heating pipeline corresponding to the fuel tank includes a third electric control valve, the heating pipeline corresponding to the battery includes a second electric control valve, and the heating pipeline corresponding to the engine includes a first electric control valve; among them, the temperatures of the multiple components at least include the coolant temperature of the engine, the fuel temperature in the fuel tank, and the cell temperature of the battery; Among them, when the current ambient temperature meets the cold start condition, control at least one of the multiple electric control valves to close to heat at least one of the multiple components, and when the component is heated to a preset heating threshold, based on opening the intake air heating control device to heat the intake air in the engine compartment for a preset heating duration, includes: When the current ambient temperature is lower than the first threshold and higher than the second threshold, control the heating system to turn on and control the first electric control valve to open, disconnect the second and third electric control valves, so that the heating system heats the coolant of the engine; When the coolant temperature of the engine is higher than the first heating threshold, open the intake air heating control device to heat the intake air in the engine compartment for a preset heating duration.

3. The control method according to claim 2, characterized in that, When the current ambient temperature meets the cold start condition, control at least one of the multiple electric control valves to close to heat at least one of the multiple components, and when the component is heated to a preset heating threshold, based on opening the intake air heating control device to heat the intake air in the engine compartment for a preset heating duration, further includes: When the current ambient temperature is lower than the second threshold and higher than the third threshold, control the heating system to turn on and control the first and second electric control valves to open, disconnect the third electric control valve, so that the heating system heats the coolant of the engine and the cell of the battery; When the cell temperature of the battery is higher than the second heating threshold, open the intake air heating control device to heat the intake air in the engine compartment for a preset heating duration.

4. The control method according to claim 3, characterized in that, When the current ambient temperature meets the cold start condition, at least one of the multiple electronically controlled valves is controlled to close to heat at least one of the multiple components, and when the component is heated to a preset heating threshold, the intake heating control device is turned on based on this to perform intake heating in the engine compartment for a preset heating duration. It further includes: When the current ambient temperature is lower than a third threshold, the heating system is controlled to turn on, and the first electronically controlled valve, the second electronically controlled valve, and the third electronically controlled valve are controlled to turn on so that the heating system heats the coolant of the engine, the battery cells, and the fuel in the fuel tank; When the fuel temperature in the fuel tank is greater than a third heating threshold, the intake heating control device is turned on to perform intake heating in the engine compartment for a preset heating duration.

5. The control method according to claim 1, characterized in that, It further includes: When the motor maintains the preset motor reverse dragging speed for a first preset duration and the output torque of the motor is a positive torque, the reverse dragging speed of the motor is increased.

6. The control method according to claim 5, wherein, It further includes: If after increasing the reverse dragging speed value of the motor, the engine still fails to ignite successfully within a preset reverse dragging duration, the motor is controlled to exit the state of reverse dragging the engine, and the preset reverse dragging duration is set based on the current ambient temperature.

7. The control method according to claim 1, wherein It further includes: If the speed of the engine drops and stops running, an engine start failure message is generated.

8. A fast cold start control system for a range extender, characterized in that, It includes: A quick cold start device, including: a heating system, an intake heating control device in the engine compartment, and multiple heating pipelines. The heating system heats the corresponding components through the heating pipelines, where the heating pipelines include electronically controlled valves; A controller, and the controller is used to execute the quick cold start control method of a range extender as described in any one of claims 1 to 7 above.

9. The control system according to claim 8, wherein The multiple components include a fuel tank, a battery, and an engine; among them, the heating pipeline corresponding to the fuel tank includes a third electronically controlled valve, the heating pipeline corresponding to the battery includes a second electronically controlled valve, and the heating pipeline corresponding to the engine includes a first electronically controlled valve.

10. A hybrid vehicle, characterized in that, It includes: A range extender, the range extender includes an engine and a motor, and the power output shaft of the engine is connected to the power input shaft of the motor; A battery, and the motor is connected to the battery; And The quick cold start control system as described in any one of claims 8 - 9.

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