CN115370516A - A range-extended starting method, starting system and vehicle - Google Patents

Abstract

The invention relates to an enhanced starting method, a starting system and a vehicle, wherein the extended range starting method comprises the following steps: acquiring the residual electric quantity of a vehicle power battery; judging whether the residual electric quantity of a vehicle power battery is lower than a first threshold value or not; when the residual electric quantity of the vehicle power battery is lower than a first threshold value, the generator is started in a mode of limiting the power of the vehicle-mounted electric appliance, and the generator is utilized to drag the engine to realize the starting of the engine; when the engine is started, the engine drags the generator to generate electricity, and the vehicle power battery is charged. The range-extending starting method, the starting system and the vehicle provided by the invention can ensure that the power battery of the vehicle supplies enough electricity to the generator in a mode of limiting the power of the vehicle-mounted electrical appliance when the vehicle has low electric quantity, realize the starting of the generator under the condition of low electric quantity, realize the starting of the engine without the aid of the starter, ensure the range-extending starting of the vehicle under the condition of low electric quantity of the power battery, and simultaneously reduce the cost of the vehicle.

Description

A range-extended starting method, starting system and vehicle

technical field

The invention relates to the field of hybrid vehicles, in particular to a range-extended starting method, a starting system and a vehicle.

Background technique

The range-extended electric vehicle refers to a type of vehicle that charges the battery through the engine to increase the mileage of the electric vehicle. Since the engine is only responsible for power supply and not directly involved in driving, the extended-range car drives like a pure electric car, and the driving experience is smoother. And through the range extension of the engine, the cruising range of the vehicle is longer than that of a pure electric vehicle. Compared with other hybrid vehicles, the range-extending model adopts the simplest series mode, because the structure of the system is relatively simple, so objectively speaking, the failure rate of this model may be lower, and the maintenance of the vehicle after a failure is also easier. Simple and cheap.

In the related art, there are mainly two ways to start the range extender (engine). One method of range-extended starting is to control the starting of the engine through the generator and the starter in time-sharing; another way to start the range-extending method is to control the starting of the engine by the generator full-time.

However, the time-sharing control of the engine by the generator and the starter needs to add a starter, which is costly; and the generator controls the engine's starting mode full-time, which may easily cause the engine to fail to start or start to shake when the battery is low. Neither method can guarantee a smooth start of the engine in the case of a single starting device.

Contents of the invention

Embodiments of the present invention provide a range-extended starting method, a starting system and a vehicle, so as to solve the problem in the related art that a generator is used as a starter to ensure smooth starting of the engine in a low-battery environment.

In the first aspect, a method for starting an extended range is provided, which includes the following steps: obtaining the remaining power of the vehicle power battery; judging whether the remaining power of the vehicle power battery is lower than a first threshold; when the remaining power of the vehicle power battery is lower than the first threshold When a threshold is reached, the generator is started by limiting the power of the on-board electrical appliances, and the generator is used to drive the engine to start the engine; when the engine is started, the engine drives the generator to generate electricity to charge the vehicle power battery. That is to say, when the remaining power of the vehicle's power battery is too low to meet the normal operation of all the on-board electrical appliances and the vehicle's generator at the same time, the vehicle's generator is given priority to supply power to the vehicle's generator by limiting the power of the on-board electrical appliance to ensure that the generator Rotate without external mechanical energy input. After the generator drives the engine to start, the engine drives the generator to rotate, input mechanical energy to the generator, and convert the mechanical energy into electrical energy through the generator to supplement the power battery of the vehicle and increase the cruising range of the vehicle. It should be noted that the on-board electrical appliances mentioned in this article include air conditioners, on-board heaters, display screens, and drive motors. Since the engine can be started by the generator when the power battery is relatively low, there is no need to install an additional starter on the vehicle for starting the engine, which reduces the cost of the vehicle and reduces the weight of the vehicle, which is convenient The arrangement of related parts on the vehicle.

In some embodiments, when the remaining power of the vehicle power battery is lower than the first threshold and higher than the second threshold, the generator is started by limiting the speed of the drive motor, and the generator is used to drive the engine; when the remaining power of the vehicle power battery When the electric quantity is lower than or equal to the second threshold, the generator is started by limiting the speed of the drive motor and the vehicle heater, and the generator is used to drive the engine.

In some embodiments, when the remaining power of the vehicle power battery is lower than the first threshold, the generator drives the engine in a manner of torque decay until the engine reaches the first speed, and the engine injects fuel to ignite to realize starting of the engine.

In some embodiments, the generator drives the engine in a manner of torque decay comprising the following steps: monitoring the engine speed; when the engine speed is lower than a second speed, the generator drives the engine with a first torque ; When the rotational speed of the engine is greater than or equal to the second rotational speed and less than the first rotational speed, the torque of the generator gradually decays as the rotational speed of the engine increases, until the rotational speed of the engine reaches the first rotational speed, the torque of the generator decays to zero.

In some embodiments, when the remaining power of the vehicle power battery is lower than the first threshold, the generator is started in a manner of limiting the power of the on-board electrical appliances, and the generator is used to drag the engine to start the engine, including the following steps; The engine is dragged by the engine until the engine reaches the third rotational speed, the engine is injected and ignited to start the engine.

In some embodiments, when the remaining power of the vehicle power battery is higher than or equal to the first threshold, the generator is directly started, and the generator is used to drive the engine until the engine speed reaches the fourth speed, and the engine is injected and ignited to realize the engine start, the fourth rotational speed is higher than the third rotational speed.

In some embodiments, the generator drives the engine in a torque control mode before the engine is started.

In some embodiments, when the engine is started, the engine drives the generator in a rotational speed control mode.

In a second aspect, a starting system is provided, and the starting system includes: an acquisition module, which is used to acquire the remaining power of the vehicle power battery; a judgment module, which is used to judge whether the remaining power of the vehicle power battery is greater than The first threshold: a control module, when the judging module judges that the remaining power of the vehicle power battery is lower than the first threshold, the control module starts the generator in a manner that limits the power of the on-board electrical appliances, and uses the generator to drive the engine , to start the engine.

In a third aspect, a vehicle is provided, and the vehicle includes the above starting system.

The beneficial effects brought by the technical solution provided by the invention include:

Embodiments of the present invention provide a range-extended starting method, a starting system and a vehicle. When the remaining power of the vehicle power battery is low until it is lower than the first threshold, by limiting the power of the on-board electrical appliances, more power is provided for the starting of the generator. There is a large amount of remaining power to avoid the failure of the generator to start due to insufficient power. By ensuring the smooth start of the generator under low battery, the generator is used to drive the engine to realize the start of the engine. It can realize the smooth starting of the engine by the low-battery generator. And it is not necessary to arrange a starter, which reduces the cost of the complete vehicle. Therefore, the smooth starting of the engine can be completed without setting a starter, and the cost is low.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings that need to be used in the description of the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present invention. For those skilled in the art, other drawings can also be obtained based on these drawings without creative effort.

FIG. 1 is a flow chart of a method for starting a range extension provided by an embodiment of the present invention;

FIG. 2 is a flow chart of another range-extended starting method provided by an embodiment of the present invention;

Fig. 3 is a flow chart of a range-extending method for starting an engine in a manner of torque decay when the vehicle is low in battery power according to an embodiment of the present invention;

Fig. 4 is the specific flowchart of the range-extending start of the generator starting the engine in the mode of torque decay in Fig. 3;

Fig. 5 is a schematic diagram of a frame structure of an activation system provided by an embodiment of the present invention.

Detailed ways

In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments It is a part of embodiments of the present invention, but not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

Embodiments of the present invention provide a range-extended starting method, a starting system and a vehicle, which can solve the problem in the related art that a generator is used as a starter to ensure smooth starting of an engine in a low-battery environment.

Referring to Fig. 1, a method for starting a range-extended range provided by an embodiment of the present invention may include the following steps:

Obtain the remaining power of the vehicle power battery;

Judging whether the remaining power of the vehicle power battery is lower than the first threshold;

When the remaining power of the vehicle power battery is lower than the first threshold, the generator is started by limiting the power of the on-board electrical appliances, and the generator is used to drive the engine to start the engine;

When the engine is started, the engine drives the generator to generate electricity to charge the power battery of the vehicle.

That is to say, when the remaining power of the vehicle's power battery is too low to meet the normal operation of all the on-board electrical appliances and the vehicle's generator at the same time, the vehicle's generator is given priority to supply power to the vehicle's generator by limiting the power of the on-board electrical appliance to ensure that the generator Rotate without external mechanical energy input. After the generator drives the engine to start, the engine drives the generator to rotate, input mechanical energy to the generator, and convert the mechanical energy into electrical energy through the generator to supplement the power battery of the vehicle and increase the cruising range of the vehicle. It should be noted that the on-board electrical appliances mentioned in this article include air conditioners, on-board heaters, display screens, and drive motors. When limiting the power of on-board electrical appliances, the power of high-power non-essential units can be reduced first according to the priority of the vehicle, such as reducing the power of the vehicle's air conditioning system or temporarily shutting down the air conditioner, or reducing the speed of the vehicle's drive motor. After the engine is started, the power battery is charged by the generator, and the restriction on the power of the on-board electrical appliances is gradually lifted as the power of the power battery increases. Improve the driving experience of passengers during driving. In this embodiment, when the SOC (State of Charge, state of charge) of the vehicle is equal to 10%, it is defined as the remaining power of the vehicle is at the first threshold. That is, when the SOC of the vehicle is lower than 10%, the power of the on-board electrical appliances of the vehicle is limited. Since the engine can be started by the generator when the power battery is relatively low, there is no need to install an additional starter on the vehicle for starting the engine, which reduces the cost of the vehicle and reduces the weight of the vehicle, which is convenient The arrangement of related parts on the vehicle.

In this embodiment, limiting the power of the on-board electrical appliances refers to limiting the maximum power of each on-board electrical appliance. If the power of the on-board electrical appliances is already below the preset limit power, there is no need to reduce the power of the on-board electrical appliances to ensure power generation. When the power of the on-board electrical appliances is higher than the preset limit power, the normal start of the generator can be realized by reducing the power of the on-board electrical appliances.

In other embodiments, a more appropriate first threshold may be selected according to the capacity of the vehicle's power battery, so as to realize the extended-range start of the vehicle. For example, in the case that the battery capacity of the vehicle is large or the power used by the electric appliances on the vehicle is smaller, the first threshold may be appropriately lowered. When the battery capacity of the vehicle is small or the power used by the vehicle electrical appliances is higher, the first threshold may be appropriately increased.

Referring to Fig. 1, in some optional embodiments, the situation that the power battery of the vehicle is lower than the first threshold can be further subdivided.

When the remaining power of the vehicle power battery is lower than the first threshold and higher than the second threshold, the generator is started by limiting the speed of the drive motor, and the generator is used to drive the engine;

When the remaining power of the vehicle power battery is lower than or equal to the second threshold, the generator is started by limiting the speed of the drive motor and the vehicle heater, and the generator is used to drive the engine.

That is to say, when the power of the power battery is low until it is lower than the first threshold and higher than the second threshold, first limit the rotation speed of the driving motor, and reduce the loss of the output power of the power battery by limiting the vehicle speed to ensure power generation. The normal start of the generator under this power level can avoid the situation that the generator fails to start due to insufficient power when half of the power is started. In this embodiment, the remaining power of the battery is at the second threshold when the SOC of the vehicle is at 5%. When the SOC of the vehicle is at 10%-5%, the rotational speed of the drive motor will be limited, thereby preventing the vehicle from reaching a high-speed driving state. Reduce power loss and prevent the vehicle from running out of control due to low power when driving at high speeds. Improved safety performance when driving with low battery. At this stage, it is also possible to limit the power of high-power non-essential electrical appliances inside the vehicle. For example, in this embodiment, when the SOC of the vehicle is between 10% and 5%, the power of the air conditioner of the vehicle is also limited. Temporarily shut down to ensure that the power battery can provide starting power for the generator to realize the start of the engine range extender.

When the power of the power battery is lower than the second threshold, in addition to limiting the speed of the drive motor, it is also necessary to limit the power of the heater of the vehicle, where the heater can be a PTC (positive temperature coefficient, positive temperature coefficient) The heater, by limiting the power used by the vehicle heater, reduces the occupancy of the vehicle's power battery by the relevant electrical appliances in the vehicle. At this time, the power of the air conditioner can also be limited, and the air conditioner can even be shut down to ensure that the remaining power of the power battery can afford the generator to drive the engine to start.

Among them, the power usage of relevant on-board electrical appliances on the vehicle can be further subdivided according to the remaining power of the power battery. For example, when the remaining power is lower than the first threshold, more stages can be divided, and one or more The power of electrical appliances, when the remaining power is low to the next stage, further limit the power used by on-board electrical appliances. That is to say, the lower the remaining power, the lower the available power of the on-board electrical appliances. The way to limit the power of electrical appliances can be realized by gradually increasing the types of limited electrical appliances, and can also be realized by reducing the available power of each electrical appliance. In extreme cases, when the power of the power battery is about to drop to the situation where the generator can only start the engine, the vehicle should be stopped in an emergency and the on-board electrical appliances on the vehicle should be turned off. All the power of the power battery is supplied to the generator, the generator drives the engine to start, and the generator successfully generates electricity and charges the power battery. After the electric power of the power battery increases to the first threshold value, power is supplied to the on-board electrical appliances through the power battery.

Referring to Fig. 1 and Fig. 3, in some embodiments, when the remaining power of the vehicle power battery is lower than the first threshold, the generator drives the engine in a manner of torque decay until the engine reaches the first speed When , the engine injects fuel to ignite to realize the starting of the engine. That is to say, when the power battery of the vehicle is lower than the first threshold, not only the power of the on-board electrical appliances will be limited, but also the generator will drag the engine in a manner of torque decay. Since power is equal to torque multiplied by speed. When the power of the power battery is low, even if the power used by the on-board electrical appliances is limited, the power that the power battery can supply to the generator is limited. By dragging the engine by means of torque attenuation, the power of the generator can be kept constant. , to ensure the stable start of the engine, and avoid the failure of the generator to drive the engine due to the power of the generator increasing to the point that the power battery cannot bear the load during the process of increasing the engine speed. The stable start of the range-extending start is realized. After the engine reaches the first rotational speed, the engine is injected and ignited, and the rotation of the engine is realized through the combustion of fuel inside the engine. The subsequent engine can be rotated by the combustion of fuel. In this embodiment, the fuel of the engine can be fuel such as gasoline, diesel or natural gas. The rotation of the generator is driven by the rotation of the engine to charge the power battery. Wherein, the torque of the engine may be attenuated when the generator is started, or the torque of the generator may be attenuated when the rotational speed of the generator reaches a certain threshold.

Referring to Fig. 1, Fig. 3 and Fig. 4, in some optional embodiments, said generator dragging the engine in a manner of torque decay includes the following steps:

Monitor engine speed;

when the rotational speed of the engine is lower than the second rotational speed, the generator drives the engine with a first torque;

When the rotational speed of the engine is greater than or equal to the second rotational speed and less than the first rotational speed, the torque of the generator gradually decays as the rotational speed of the engine increases, until the rotational speed of the engine reaches the first rotational speed, and the torque of the generator decays to zero .

That is to say, when the generator is driving the engine, the engine speed needs to be monitored, and the torque of the generator should be attenuated in combination with the engine speed. When the engine rotates at a low speed, the torque of the generator drives the engine with a relatively large first torque. In this embodiment, the first speed may be 200 rpm, and the first torque may be 60 N/m. That is to say, when the engine speed is lower than 200 rpm, the torque of the generator is always maintained at 60N/m, and the high torque of the generator at low speed ensures that the torque of the generator is sufficient to drag the stalled engine in the initial stage. When the engine speed is greater than or equal to the first speed, the engine itself has a certain inertia to maintain its rotation, while the generator will provide supplementary torque to drive the engine to reach a higher speed. In this embodiment, when the engine speed is higher than 200 revolutions and lower than 600 revolutions, the torque of the generator is attenuated by 5 N/m every time the engine speed increases by 50 revolutions, until the engine speed reaches 600 revolutions, the torque of the generator is attenuated to 0, At this moment, the engine reaches the starting speed, and the engine is injected and ignited to start the engine.

In other embodiments, generators may be decayed on other schedules. If a linear curve is set, the torque of the generator can be reduced more smoothly. Or set the quadratic curve to attenuate the generator, so as to realize the effect that the generator decays slowly when the engine speed is low, and the generator decays faster when the engine speed is high.

Preferably, in some optional embodiments, when the remaining power of the vehicle power battery is lower than the first threshold, the generator is started by limiting the power of the on-board electrical appliances, and the generator is used to drive the engine to start the engine. The method comprises the following steps: the generator drives the engine until the engine reaches a third rotational speed, the engine is injected and ignited to start the engine. That is to say, the fuel injection and ignition of the engine is only performed when the engine speed reaches the third speed, so as to avoid the problem of fuel injection ignition failure due to too low speed of the engine at a lower speed. In this embodiment, the generator can use a constant torque to drive the engine. In this embodiment, the torque of the generator is kept at 200 N/m. When the engine reaches the third speed of 200 rpm, the engine is injected and ignited. Or start the generator in the way of torque decay. In other embodiments, the third rotational speed may be determined according to the performance of the engine.

Referring to Figure 2, in some optional embodiments, when the remaining power of the vehicle power battery is higher than or equal to the first threshold, the generator is directly started, and the generator is used to drive the engine until the engine speed reaches the fourth threshold. When the speed is high, the engine is injected and ignited to start the engine, and the fourth speed is higher than the third speed. That is to say, when the remaining power of the battery is higher than or equal to the first threshold, since the remaining power is relatively sufficient, it is not necessary to limit the power of the vehicle electrical appliances. The remaining power can meet the starting of the generator. The engine can be started at a higher rotational speed when the electric power is sufficient. In this embodiment, the fourth rotational speed is 600 revolutions, and the drag torque of the generator is kept constant at 200 N/m. That is to say, by reducing the ignition speed of the engine, the power consumption of the generator to start the engine is reduced, and the engine is ignited when the engine is sufficient to start, so that the engine can be started faster. In the case of sufficient electricity, the time for the generator to start the engine can be longer to ensure a smoother engine start. In other embodiments, the fourth rotation speed can be determined according to the performance of the engine, and is not necessarily limited to 600 rotations. And during the starting process, the engine can also be dragged in the way of generator torque attenuation to reduce the energy loss in the starting process.

Preferably, in some optional embodiments, before the engine is started, the generator drives the engine in a torque control mode. That is to say, during the process of the generator driving the engine, limited control of the output torque of the generator can ensure that the input torque of the rotating shaft is relatively stable during the engine starting process. Among them, the generator drives the engine with constant torque, and the generator drives the engine with torque decay.

Among them, the generator can be regarded as a conventional motor in the stage of driving the engine, and its rotation is mainly used to control the generator through the current loop, and the torque of the generator is proportional to the current. The controller utilizing the generator will obtain the actual motor current from the drive to determine the actual generator torque. It then compares the actual torque value with the desired torque and adjusts the generator's input current in real time to achieve the desired torque.

Preferably, in some optional embodiments, when the engine is started, the generator operates in a rotational speed control mode, and the engine drives the generator. That is to say, after the engine is started, the electric motor drives the generator to rotate, and by setting the generator to the speed control mode, the generator is maintained within a preset speed range. Avoid the degradation of power generation quality due to the unstable speed of the generator.

Referring to Fig. 5, the embodiment of the present invention also provides a startup system, the startup system includes:

An acquisition module, the acquisition module is used to acquire the remaining power of the vehicle power battery;

A judging module, the judging module is used to judge whether the remaining power of the vehicle power battery is greater than the first threshold;

A control module, when the judging module judges that the remaining power of the vehicle power battery is lower than the first threshold, the control module starts the generator by limiting the power of the on-board electrical appliances, and uses the generator to drive the engine to realize the power of the engine. start up.

That is to say, the remaining power of the vehicle power battery is obtained through the acquisition module, and the value of the remaining power is passed to the judgment module, and the judgment module is used to judge whether the remaining power of the power battery is lower than the first threshold. The specific value of the first threshold of the vehicle is measured by the relevant parameters of the calibration. When the remaining power is at the first threshold, the generator will fail to start due to low power.

If the judging module judges that the remaining power of the vehicle is lower than the first threshold, the power of the relevant on-board electrical appliances is limited, the power of the in-use on-board electrical appliances is reduced, and the upper limit of the power of the inactive on-board electrical appliances is set. The remaining power of the centralized power battery is sent to the generator. The priority is to ensure the start of the generator, so as to prevent the generator from being unable to drag the engine to ignite due to insufficient power during the start-up process. Among them, in-vehicle electrical appliances include not only air conditioners, but interior electrical appliances also include vehicle drive motors. When limiting the power of on-board electrical appliances, priority can be given to reducing the speed of the vehicle's drive motor to prevent the vehicle from running at high speed when the battery is low, and to prevent the vehicle running at high speed from power failure and out of control after the range extension fails. Second, electrical appliances such as air conditioners and heaters that can be temporarily turned off can be restricted. Ensure the stable power supply of generator and vehicle control system. Until the generator drives the engine to start, the engine is used to drive the generator to generate power until the remaining power is higher than the first threshold, and then the power limit of the relevant on-board electrical appliances is released. The specific acquisition module, judgment module and control module can be integrated on one chip to realize the information transmission between each module, and realize the communication with the vehicle information and the instruction to limit the power of the vehicle electrical appliances under the controller through the connection between the chip and the vehicle controller . The acquisition module, the judgment module and the control module can also be independent of each other, and the information transmission between each module can be realized through the signal transmission device, and the information transmission device can be used to transmit the electric quantity information of the vehicle to the acquisition module, and the command to limit the power of the vehicle electrical appliances can be transmitted To the on-board electrical appliances, to realize the limitation of the power of the on-board electrical appliances on the vehicle. Alternatively, the acquisition module, judgment module and control module are directly integrated on the vehicle controller.

The starting of the engine is controlled by the generator at all times. Compared with the starter used to start the engine on the vehicle, a starter is saved for the vehicle, which not only reduces the cost of the vehicle, but also reduces the weight of the vehicle. , and reduce the difficulty of layout inside the vehicle. By limiting the power of on-board electrical appliances under low battery conditions, the power of the power battery is given priority to supply to the generator, so as to avoid the failure of the generator to start under low battery conditions. It ensures the normal start of the engine under the condition of low battery, and uses the engine to drive the generator after starting to realize the extended range of the vehicle.

The present invention also provides a vehicle, which includes the above-mentioned start-up system. It can be seen from the above description that the vehicle provided by the present invention can meet the requirements of the generator by limiting the power of the on-board electrical appliances when the remaining power of the vehicle power battery is at a relatively low level. Start, and then make the generator successfully drive the engine to realize the extended range of the vehicle. There is no need to set the engine starter during the range-extending process of the vehicle. The cost of the vehicle is reduced, and the difficulty of arranging the interior of the vehicle is reduced.

In the extended-range starting method provided by the embodiment of the present invention, the principle of starting the system and the vehicle is as follows:

By judging whether the remaining power of the vehicle is the first threshold, it is analyzed whether the remaining power of the vehicle can meet the requirements of the generator driving the engine to start the extended range in the normal mode. When the remaining power of the vehicle is lower than the first threshold, it is considered that the generator drives the engine to start the extended range in the normal mode, and there is a risk of startup failure. By limiting the power of the on-board electrical appliances, the remaining power of the vehicle power battery is given priority to the generator. In order to ensure that the generator has enough starting power to drive the engine to start when the battery is low. After the engine is started, the generator is driven by the engine, and the generator generates electricity to supplement the electricity for the vehicle, thereby realizing the range extension of the vehicle. Since the engine can be started by the generator under the condition of low power, the starter does not need to be used to start the engine under low power, and the starter does not need to be arranged on the vehicle, which reduces the cost of the vehicle and reduces the difficulty of layout in the vehicle.

In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "upper", "lower", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description. It is not intended to indicate or imply that the referred device or element must have a particular orientation, be constructed in a particular orientation, and operate in a particular orientation, and thus should not be construed as limiting the invention. Unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be interpreted in a broad sense, for example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection, It can also be an electrical connection; it can be a direct connection, or an indirect connection through an intermediary, or an internal communication between two components. Those of ordinary skill in the art can understand the specific meanings of the above terms in the present invention according to specific situations.

It should be noted that in the present invention, relative 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 There is no such actual relationship or order between these entities or operations. Furthermore, the term "comprises", "comprises" or any other variation thereof is intended to cover a non-exclusive inclusion such that a process, method, article, or apparatus comprising a set of elements includes not only those elements, but also includes elements not expressly listed. other elements of or also include elements inherent in such a process, method, article, or device. Without further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of additional identical elements in the process, method, article or apparatus comprising said element.

The above descriptions are only specific embodiments of the present invention, so that those skilled in the art can understand or implement the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Accordingly, the present invention will not be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features claimed herein.

Claims (10)

1. A range-extended starting method is characterized by comprising the following steps:

acquiring the residual electric quantity of a vehicle power battery;

judging whether the residual electric quantity of the vehicle power battery is lower than a first threshold value or not;

when the residual electric quantity of the vehicle power battery is lower than a first threshold value, the generator is started in a mode of limiting the power of the vehicle-mounted electric appliance, and the generator is utilized to drag the engine to realize the starting of the engine;

when the engine is started, the engine drags the generator to generate electricity to charge the vehicle power battery.

2. The extended range start method of claim 1, wherein:

when the residual electric quantity of the vehicle power battery is lower than a first threshold value and higher than a second threshold value, starting the generator in a mode of limiting the rotating speed of the driving motor, and dragging the engine by using the generator;

and when the residual capacity of the vehicle power battery is lower than or equal to a second threshold value, starting the generator in a mode of limiting the rotating speed of the driving motor and limiting the heater of the automobile, and dragging the engine by using the generator.

3. The range-extending starting method according to claim 1, characterized in that:

when the residual electric quantity of a vehicle power battery is lower than a first threshold value, the generator drags the engine in a torque attenuation mode until the engine reaches a first rotating speed, and the engine is subjected to oil injection and ignition to realize the starting of the engine.

4. The range-extending starting method according to claim 3, characterized in that:

the generator dragging the engine in a torque attenuation manner comprises the following steps:

monitoring the rotational speed of the engine;

the generator drags the engine with a first torque when the rotational speed of the engine is lower than a second rotational speed;

when the rotating speed of the engine is greater than or equal to the second rotating speed and less than the first rotating speed, the torque of the generator is gradually attenuated along with the increase of the rotating speed of the engine until the rotating speed of the engine reaches the first rotating speed, and the torque of the generator is attenuated to zero.

5. The extended range start method of claim 1,

when the residual capacity of a vehicle power battery is lower than a first threshold value, a generator is started in a mode of limiting the power of a vehicle-mounted electric appliance, and the generator is utilized to drag an engine to realize the starting of the engine, and the method comprises the following steps;

the generator drags the engine until the engine reaches a third rotating speed, and the engine is subjected to oil injection and ignition to realize the starting of the engine.

6. The extended range start method of claim 5, wherein:

when the residual electric quantity of the vehicle power battery is higher than or equal to a first threshold value, the generator is directly started, the generator is used for dragging the engine until the rotating speed of the engine reaches a fourth rotating speed, oil injection and ignition are carried out on the engine, and the engine is started, wherein the fourth rotating speed is higher than the third rotating speed.

7. The extended range start method of claim 1, wherein:

before the engine is started, the generator drags the engine in a torque control mode.

8. The range-extending starting method according to claim 1, characterized in that:

when the engine is started, the generator operates in a rotating speed control mode, and the engine drags the generator.

9. A starting system, characterized in that it comprises:

the acquisition module is used for acquiring the residual electric quantity of the vehicle power battery;

the judging module is used for judging whether the residual electric quantity of the vehicle power battery is larger than a first threshold value or not;

and the control module starts the generator in a mode of limiting the power of the vehicle-mounted electric appliance when the judging module judges that the residual electric quantity of the vehicle power battery is lower than the first threshold value, and drags the engine by utilizing the generator to realize the starting of the engine.

10. A vehicle, characterized in that it comprises a starting system according to claim 9.

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