CN110654371A - Vehicle power system control method, device and vehicle - Google Patents

Abstract

The present invention provides a control method, device and vehicle for a vehicle power system; the control method includes the following steps: acquiring state information during the running of the vehicle; determining the current control demand of the vehicle according to the state information; wherein the control demand includes starting the engine , at least one of the pull-stop engine and the booster engine; the BSG is controlled according to the control requirements. The control method, device and vehicle of the vehicle power system of the present invention have the advantages of high power generation efficiency, capable of realizing power generation under all working conditions, high voltage components can still work normally when the power battery fails, low system noise, high performance and strong drivability, The user's driving experience is high.

Description

Vehicle power system control method, device and vehicle

technical field

The present invention relates to the technical field of automobile control, and in particular, to a control method, device and vehicle of a vehicle power system.

Background technique

Hybrid power generally refers to gasoline-electric hybrid power, that is, a mixture of fuel (gasoline, diesel, etc.) and electricity. A hybrid vehicle is a vehicle that has an electric motor as an auxiliary power drive for the engine.

In the related art, the power control system of a hybrid vehicle mainly includes an engine, a motor, a power battery, a clutch and a transmission, a low-voltage starter, a high-voltage component and other high-voltage components. The motor in the power control system realizes both the drive function and the power generation function. However, at present, the engine in the existing power control system is started by the low-voltage starter, but starting the engine with the low-voltage starter often shortens the life of the low-voltage starter, thus affecting the performance of the vehicle, resulting in poor drivability of the vehicle, and low-voltage starting. The machine itself has a lot of noise, which makes the user experience low.

SUMMARY OF THE INVENTION

The present invention aims to solve one of the technical problems in the related art at least to a certain extent.

Therefore, an object of the present invention is to provide a control method for a vehicle power system, so as to reduce the life loss of a low-voltage starter, improve the performance and drivability of the vehicle, reduce noise, and improve user experience.

The second object of the present invention is to provide a control device for a vehicle power system.

A third object of the present invention is to propose a vehicle.

The fourth object of the present invention is to provide an electronic device.

A fifth object of the present invention is to propose a non-transitory computer-readable storage medium.

In order to achieve the above object, an embodiment of the first aspect of the present invention provides a control method for a vehicle power system, wherein the vehicle power system includes: a belt drive motor BSG and a BSG controller; the BSG and the power system in the power system The engine is connected by a belt, the BSG controller is respectively connected with the BSG and the high-voltage components in the power system, and the BSG controller and the power battery in the power system pass through the main contactor in the power system connect;

The method includes the following steps:

obtaining state information during the driving of the vehicle;

According to the state information, the current control demand of the vehicle is determined; wherein, the control demand at least includes: starting the engine, stopping the engine, and assisting the engine;

The BSG is controlled according to the control requirement.

According to the control method of the vehicle power system proposed in the embodiment of the present invention, control requirements such as starting the engine, pulling the engine to stop, and assisting the engine are realized through the BSG, so that the low-voltage starter can no longer be simply relied on, and the starting of the engine using the low-voltage starter can be reduced. , pull-to-stop and power assist, etc., which can increase the life of the low-voltage starter, improve the performance and drivability of the vehicle and the user experience.

According to an embodiment of the present invention, when the control demand is to start the engine, the controlling the BSG according to the control demand includes: controlling the BSG to output a positive first torque, so as to pass the The forward first torque pulls up the engine; after the engine is successfully ignited, the BSG is controlled to stop outputting the forward first torque.

According to an embodiment of the present invention, when the control demand is to stop the engine, the controlling the BSG according to the control demand includes: controlling the BSG to output a reverse torque, so as to pass the Reverse torque pulls to stop the engine; controls the recovery of the electrical energy output by the motor in the power system during the engine pull-stop process; detects the rotational speed of the engine, and controls the engine when the rotational speed is reduced to a set value. The BSG stops outputting the reverse torque.

According to an embodiment of the present invention, when the control demand is to assist the engine, the controlling the BSG according to the control demand includes: controlling the BSG to output a positive second torque, so as to pass the The forward second torque increases the torque of the engine; detects whether the current torque of the engine exceeds a preset torque, and if the current torque exceeds the preset torque, controls the BSG to stop outputting the forward first torque. 2. Torque.

According to an embodiment of the present invention, after acquiring the state information during the driving of the vehicle, the method further includes: extracting the state information of the BSG from the state information, and determining, according to the state information, that the BSG is not is in a failed state.

According to an embodiment of the present invention, the control method for the power system of the vehicle further includes: during the driving process of the vehicle, detecting whether the power battery is faulty, and if a fault occurs, controlling to disconnect the power battery from the power battery. control the connection between the BSG controllers; control the low-voltage starter in the power system to start the engine, so as to drive the BSG to run through the engine; obtain the target voltage of the vehicle, and control the BSG to output the target voltage, and input the target voltage to the high voltage component.

According to an embodiment of the present invention, the control method of the vehicle power system further includes: identifying the current power generation condition of the vehicle, acquiring a power generation strategy matching the power generation condition, and performing power generation control according to the power generation strategy.

In order to achieve the above object, the embodiment of the second aspect of the present invention provides a control device for a power system of a vehicle, which is used in the power system of the vehicle. The power system includes: a belt drive motor BSG and a BSG controller; The BSG is connected with the engine in the power system through a belt, the BSG controller is respectively connected with the BSG and the high-voltage components in the power system, and the BSG controller is connected with the power battery in the power system through a belt. a main contactor connection in the power system;

The control device of the vehicle power system, comprising:

an acquisition module, used to acquire the state information during the driving process of the vehicle;

a determination module, configured to determine the current control demand of the vehicle according to the state information; wherein, the control demand at least includes: starting the engine, pulling the engine to stop, and assisting the engine;

A first control module, configured to control the BSG according to the control requirement.

According to the control device of the vehicle power system proposed in the embodiment of the present invention, the control requirements at least include: starting the engine, pulling the engine to stop and boosting the engine, controlling the BSG according to the control requirements through the first control module, and realizing different requirements of the engine through the BSG, Therefore, it is no longer possible to simply rely on the low-voltage starter, and the use of the low-voltage starter to start, stop and assist the engine, etc., can increase the life of the low-voltage starter, and improve the performance, drivability and user experience of the vehicle.

According to an embodiment of the present invention, the first control module is specifically configured to: when the control demand is to start the engine, control the BSG to output a forward first torque, so as to pass the forward first torque The torque pulls up the engine; after the engine is successfully ignited, the BSG is controlled to stop outputting the forward first torque.

According to an embodiment of the present invention, the first control module is specifically configured to: when the control demand is to pull and stop the engine, control the BSG to output a reverse torque, so as to pull the stop through the reverse torque the engine; control the recovery of the electrical energy output by the motor in the power system during the engine pull-to-stop process; detect the rotational speed of the engine, and control the BSG to stop outputting all the power when the rotational speed is reduced to a set value. the reverse torque.

According to an embodiment of the present invention, the first control module is specifically configured to: when the control demand is to boost the engine, control the BSG to output a forward second torque, so as to pass the forward second torque The torque increases the torque of the engine; detects whether the current torque of the engine exceeds a preset torque, and if the current torque exceeds the preset torque, the BSG is controlled to stop outputting the forward second torque.

According to an embodiment of the present invention, the control device for the power system of the vehicle further includes: a first fault identification module, configured to extract the status information of the BSG from the status information after acquiring the status information during the running of the vehicle. Status information, according to the status information, it is determined that the BSG is not in a fault state.

According to an embodiment of the present invention, the control device of the vehicle power system further includes: a second fault identification module, configured to detect whether the power battery is faulty during the driving process of the vehicle, and if a fault occurs, control the Disconnecting the connection between the power battery and the BSG controller; a second control module for controlling the low-voltage starter in the power system to start the engine, so as to drive the BSG to run through the engine, The target voltage of the vehicle is acquired, the BSG is controlled to output the target voltage, and the target voltage is input to the high-voltage component.

According to an embodiment of the present invention, the control device of the vehicle power system further includes: a power generation control module, configured to identify the current power generation condition of the vehicle, obtain a power generation strategy matching the power generation condition, and generate electricity according to the power generation condition. strategy for power generation control.

In order to achieve the above object, an embodiment of the third aspect of the present invention provides a vehicle, including: the control device of the vehicle power system according to the embodiment of the second aspect of the present invention.

To achieve the above object, an embodiment of the fourth aspect of the present invention provides an electronic device, comprising a memory, a processor, and a computer program stored in the memory and running on the processor, the processor executing all The above program is used to realize the control method of the vehicle power system according to the embodiment of the first aspect of the present invention.

In order to achieve the above purpose, the fifth aspect of the present invention provides a non-transitory computer-readable storage medium on which a computer program is stored, and the program is executed by a processor to achieve the first aspect of the present invention. The control method of the vehicle power system described above.

Description of drawings

1 is a schematic structural diagram of a power system of a vehicle according to an embodiment of the present invention;

FIG. 2 is a flowchart of a control method of a vehicle power system according to an embodiment of the present invention;

3 is a schematic flowchart of a control method of a vehicle power control system according to an embodiment of the present invention;

4 is a schematic flowchart of a control method for a vehicle power system according to another embodiment of the present invention;

5 is a schematic flowchart of a control method for a vehicle power system according to another embodiment of the present invention;

6 is a schematic flowchart of a control method of a vehicle power control system according to another embodiment of the present invention;

FIG. 7 is a structural diagram of a control device of a vehicle power system according to an embodiment of the present invention;

8 is a schematic structural diagram of another control device of a vehicle power system provided according to an embodiment of the present invention;

FIG. 9 is a structural diagram of a vehicle according to an embodiment of the present invention;

FIG. 10 is a structural diagram of an electronic device according to an embodiment of the present invention.

Detailed ways

The following describes in detail the embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals refer to the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary, and are intended to explain the present invention and should not be construed as limiting the present invention.

The control method, device and vehicle of the vehicle power system according to the embodiments of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 is a schematic structural diagram of a vehicle power system according to an embodiment of the present invention.

As shown in Figure 1, the power system of the vehicle includes: engine 1, low-voltage starter 7, clutch 4, motor 3, transmission 5, motor controller, power battery 2, main contactor 9, high-voltage components 10 and other high-voltage components , Belt drive motor BSG6 and BSG controller 8. Among them, the engine 1 is respectively connected with the low-voltage starter 7 and the clutch 4, the motor 3 is respectively connected with the clutch 4, the transmission 5 and the motor controller, the motor controller is connected with the main contactor 9, and the high-voltage component 10 and other high-voltage components are in contact with the main contactor 9. The BSG6 is connected with the engine 1 in the power system through a belt, the BSG controller 8 is connected with the BSG6 and the high voltage components in the power system respectively, and the BSG controller 8 is connected with the power battery 2 in the power system through the main power system in the power system. Contactor 9 is connected.

Compared with the related art, the belt drive motor BSG6 and the BSG controller 8 are newly added to the vehicle power system. The belt drive motor BSG6 is directly connected with the engine 1 through the belt, so the transmission chain of power generation is greatly shortened, and series power generation can be realized; the engine 1 is directly connected with the belt drive motor BSG6, and the BSG controller 8 is respectively connected with the BSG6 and the power system The high-voltage component 10 is connected to other high-voltage components. Therefore, when the power battery fails, it is controlled by the BSG controller 8 to ensure that some or all of the high-voltage components can continue to work.

FIG. 2 is a flowchart of a control method of a vehicle power system according to an embodiment of the present invention. The control method of the vehicle power system provided in the embodiment of the present invention is used to control the power system of FIG. 1 .

As shown in Figure 2, the control method of the vehicle power system includes the following steps:

S101: Acquire state information during the running of the vehicle.

In this embodiment of the present invention, state information of the vehicle during driving can be obtained. For example, the state information may include the driving mode of the vehicle, the remaining power of the power battery, or the state of some hardware in the vehicle, such as the state of the clutch, the rotational speed of the motor, the speed of the vehicle, etc.

Among them, the driving mode of the vehicle can be obtained through the identification of the on-board controller, the remaining power of the power battery can be obtained through the battery management unit of the power battery, and the status of some hardware in the vehicle can be obtained through the sensors and controllers of the corresponding hardware, for example , the state of the clutch can be obtained by the clutch controller, the speed of the motor can be obtained by the speed sensor set on the motor, and the running speed of the vehicle can be obtained by the speed sensor set on the wheel.

S102, according to the state information, determine the current control demand of the vehicle; wherein, the control demand at least includes: starting the engine, pulling the engine to stop, and assisting the engine.

In the embodiment of the present invention, different identification strategies are pre-set for different control requirements, wherein the identification strategy includes conditions that the state information of the vehicle needs to meet under the control requirements. Optionally, after the state information of the vehicle is acquired, the state information of the vehicle may be compared with the identification strategies corresponding to different control demands, and the current control demands of the vehicle are determined according to the comparison results. Control requirements may include at least starting the engine, pulling the engine off, and assisting the engine.

It should be noted that the control requirements may also be other control requirements, and correspondingly other control requirements have other identification strategies. The above control requirements are only examples and cannot be used as limitations of the control requirements.

S103, control the BSG according to the control requirement.

It should be noted that, in this embodiment of the present invention, due to different control requirements, different controls need to be performed on the BSG. Therefore, in addition to directly controlling the BSG according to the control requirements, the control strategy can be further obtained according to the control requirements. Then, the BSG is controlled according to the control strategy. Specifically, the mapping relationship between the control requirements and the control strategy of the BSG may be established in advance. After the control requirements are acquired, the above mapping relationship may be queried to obtain a BSG control strategy matching the control requirements acquired in the above S102. After the control strategy is obtained, the BSG can be controlled according to the control strategy.

When the control demand is to start the engine, the BSG is controlled to output the forward first torque to pull up the engine to ignite by the forward first torque. Driven by the first torque, the engine will gradually rotate, and when the speed reaches a certain value, the ignition can be successful. After the engine is successfully ignited, it means that the engine has been started successfully, and the BSG can be controlled to stop outputting the forward first torque.

When the control demand is to stop the engine, the BSG is controlled to output reverse torque to stop the engine through the reverse torque. During the process of pulling and stopping the engine, the rotational speed of the engine will continue to decrease, but since the engine does not completely stop running, the motor will still output electric energy. The electrical energy output during the engine pull-to-stop process. Specifically, an energy recovery instruction may be sent to the motor controller, so that the motor controller stores the energy output by the motor in the process of pulling and stopping the engine into the power battery according to the recovery instruction.

Further, in the process of pulling and stopping the engine, the rotational speed of the engine is continuously detected. For example, a rotational speed sensor is provided on the engine, and the current rotational speed of the engine is detected by the rotational speed sensor. When the speed is reduced to the set value, it means that the engine has gradually approached to stop, and will eventually stop driven by the remaining reverse torque. Therefore, the BSG can be controlled to stop outputting the reverse torque.

When the control demand is to boost the engine, the BSG is controlled to output the second forward torque to boost the torque of the engine by the forward second torque. In the embodiment of the present invention, the power corresponding to the torque output by the current engine cannot meet the power demand of the vehicle. In order to meet the power demand of the vehicle, the engine needs to be boosted. Therefore, a positive second torque can be output through the BSG, In order to accelerate the rotation of the engine through the second torque, more torque can be provided to the vehicle to provide more power.

Further, when the engine is boosted by BSG for a period of time, the torque output by the engine should be able to meet the demand of the vehicle, and when the demand is met, there is no need to continue assisting the engine. Therefore, it can be detected whether the current torque of the engine exceeds the preset value. If the current torque exceeds the preset torque, it means that the torque output by the engine can meet the needs of the vehicle, and the BSG can be controlled to stop outputting the positive second torque to avoid wasting energy.

The control method of the vehicle power system provided by the embodiment of the present invention obtains the state information during the running process of the vehicle; according to the state information, the current control demand of the vehicle is determined; wherein, the control demand at least includes: starting the engine, pulling the engine to stop, and assisting the engine , and control the BSG according to the control requirements. In this embodiment, the BSG is controlled based on the control requirements, and different requirements of the engine are realized through the BSG, so that the low-voltage starter can no longer be simply relied on, and the start or pull-to-stop of the engine using the low-voltage starter can be reduced, so as to avoid reducing the Low voltage starter life, reduced response to vehicle performance. In addition, the low-voltage starter is not used to start or stop the engine, which can reduce noise output, reduce noise pollution to the environment, and improve vehicle drivability and user experience.

In order to clearly illustrate the above embodiment, the following detailed description will be made with reference to FIG. 3 .

3 is a schematic flowchart of a control method of a vehicle power control system according to an embodiment of the present invention. As shown in FIG. 3 , the control method of the vehicle power control system includes the following steps:

S201, start.

S202: Acquire state information of the vehicle during driving.

For the specific introduction of S202, reference may be made to the description of the relevant content in the above-mentioned embodiment S101, and details are not repeated here.

S203, determine whether the BSG is in a fault state.

In this embodiment of the present invention, the state information includes the state information of the BSG. After the state information is acquired, the state information of the BSG may be extracted from the above state information, and then it is determined whether the BSG is in a fault state according to the state information of the BSG.

If the BSG is not in the fault state, go to S204; if the BSG is in the fault state, go to S214, and then go to S215.

S204, it is determined whether the engine needs to be started.

In the embodiment of the present invention, it is necessary to determine whether the state information of the vehicle satisfies the conditions for starting the engine. For example, switching the whole vehicle to HEV mode or the remaining SOC of the power battery is low enough to generate electricity is a condition for starting the engine. Taking this condition as an example, if the vehicle is switched to HEV mode or the remaining power SOC of the power battery is low enough to generate electricity, the engine needs to be started; if the vehicle has not switched to HEV mode and the remaining power SOC of the power battery is not low enough to require power generation, There is no need to start the engine.

If it is necessary to start the engine, go to step S207; if it is not necessary to start the engine, go to step S205;

S205, it is determined whether the engine needs to be stopped.

In the embodiment of the present invention, it is necessary to judge whether the state information of the vehicle satisfies the condition for pulling and stopping the engine. For example, switching the entire vehicle to EV mode is a condition for pulling off the engine. Taking this condition as an example, if the whole vehicle switches to EV mode, the engine needs to be stopped; if the whole vehicle does not switch to EV mode from other modes, it is not necessary to stop the engine.

If it is necessary to stop the engine, go to step S209; if it is not necessary to stop the engine, go to step S206.

S206, it is determined whether the engine needs to be boosted.

In the embodiment of the present invention, it is necessary to judge whether the state information of the vehicle satisfies the condition for boosting the engine. For example, a vehicle that needs to accelerate but the engine cannot provide enough torque is a condition for boosting the engine. Taking this condition as an example, if the entire vehicle needs to accelerate but the engine cannot provide enough torque, the engine needs to be boosted; if the entire vehicle needs to be accelerated and the engine can provide enough torque, the engine does not need to be boosted.

If the engine needs to be boosted, go to step S212; if the engine is not required to be boosted, go to step S214.

S207, the BSG is controlled to output the first forward torque, so as to pull up the engine through the forward first torque.

S208, after the engine is successfully ignited, the BSG is controlled to stop outputting the forward first torque.

For the specific introduction of the foregoing S207 to S208, reference may be made to the description of the relevant content in the foregoing embodiment, which will not be repeated here.

After controlling the BSG to stop outputting the forward first torque, the process proceeds to S215.

S209, control the BSG to output reverse torque, so as to pull and stop the engine through the reverse torque.

S210, control the electric energy output by the motor in the recovery power system in the process of pulling and stopping the engine.

S211 , detect the rotational speed of the engine, and control the BSG to stop outputting the reverse torque when the rotational speed is reduced to a set value.

For the specific introduction of the foregoing S209 to S211, reference may be made to the description of the relevant content in the foregoing embodiment, which will not be repeated here.

After controlling the BSG to stop outputting the reverse torque, the process proceeds to step S215.

S212, the BSG is controlled to output the second forward torque, so as to increase the torque of the engine through the second forward torque.

S213: Detect whether the current torque of the engine exceeds the preset torque, and if the current torque exceeds the preset torque, control the BSG to stop outputting the positive second torque.

For the specific introduction of the foregoing S211 to S212, reference may be made to the description of the relevant content in the foregoing embodiment, which will not be repeated here.

After controlling the BSG to stop outputting the forward second torque, the process proceeds to step S215.

S214: No processing, go to step S215.

S215: End.

According to the flow of the control method for the vehicle power system, the BSG is controlled based on the control requirements, and the different requirements of the engine are realized through the BSG, so that the low-voltage starter can no longer be simply relied on, and the use of the low-voltage starter to start or stop the engine can be reduced. etc., so as to avoid reducing the life of the low-voltage starter and reducing the response to the vehicle performance. In addition, the low-voltage starter is not used to start or stop the engine, which can reduce noise output, reduce noise pollution to the environment, and improve vehicle drivability and user experience.

FIG. 4 is a schematic flowchart of a control method of a vehicle power system according to another embodiment of the present invention. On the basis of the above-mentioned embodiment, also need to include the following steps:

S301 , during the driving process of the vehicle, detect whether the power battery fails.

In the embodiment of the present invention, the power battery can be detected by the detection component of the power battery. If the voltage of the power battery is not within the rated normal operating voltage range of the power battery, or the current generated by the power battery is not within the rated normal operating current range of the power battery inside, the power battery fails. If the voltage of the power battery is within the rated normal operating voltage range of the power battery, and the current generated by the power battery is within the rated normal operating current range of the power battery, the power battery is working normally and does not need to be regulated by BSG.

S302, if a fault occurs, control to disconnect the connection between the power battery and the BSG controller.

In the embodiment of the present invention, when the power battery fails, the power battery cannot normally increase the stable high voltage to make the high voltage components work normally, and the main contactor needs to be disconnected. When the main contactor is disconnected, the connection between the power battery, the BSG controller and the high-voltage component is disconnected, and the high-voltage component is only connected to the BSG controller at this time.

S303, control the low pressure starter to start the engine, so as to drive the BSG to run through the engine.

In the embodiment of the present invention, when the power battery fails, the BSG is required to provide a power source to make the high-voltage components work normally. Since the main contactor between the BSG controller and the power battery is disconnected, the BSG cannot be driven by the power battery. In the embodiment of the present invention, as shown in FIG. 1 , the low-pressure starter is connected to the engine, and the BSG is connected to the engine through a belt. Therefore, in order to make the BSG continue to output high-voltage electricity for voltage regulation, it is necessary to control the low-voltage starter to drive the engine to start, and then drive the BSG to run through the belt under the action of the engine, so that the BSG can provide a power source to the high-voltage components.

S304, obtain the target voltage of the vehicle, control the BSG to output the target voltage, and input the target voltage to the high-voltage component.

In the embodiment of the present invention, the on-board computer can first receive the vehicle signal, and obtain the target voltage of the vehicle according to the state information of the vehicle. Then, after receiving the voltage regulation control command and target voltage of the whole vehicle, the BSG motor controller controls the BSG motor to perform dynamic adjustment to maintain the actual voltage basically consistent with the target voltage, and input the regulated voltage into the high-voltage components, so that the High voltage components can work normally. When the whole vehicle does not need voltage regulation or the power battery returns to normal, the BSG stops working and does not input voltage to the high-voltage components.

In the embodiment of the present invention, when the power battery fails, the low-voltage starter is used to drive the engine to start, and the engine drives the BSG to run through the belt to provide a power source. Keep the voltage basically the same as the target voltage, and then input the regulated voltage to the high-voltage components, so that the high-voltage components can work normally, which can ensure that the high-voltage components can still work stably even when the power battery of the vehicle fails.

FIG. 5 is a schematic flowchart of a control method of a vehicle power system according to another embodiment of the present invention. On the basis of the above embodiments, the control method of the vehicle power system may further include a power generation control process.

As shown in Figure 5, the control method of the vehicle power system includes:

S401 , identifying the current power generation condition of the vehicle.

In the embodiment of the present invention, the vehicle may have modes such as in-situ power generation, series power generation, and hybrid power generation. Power generation conditions can be identified by vehicle speed, gear status, clutch status, and the remaining power SOC of the power battery. Among them, the vehicle speed can be obtained through the speed sensor set on the wheel, the gear state can be obtained through the gear controller, the state of the clutch can be obtained through the clutch controller, and the remaining power SOC of the power battery can be obtained through the power battery 2 Battery management unit acquisition.

Among them, the identification conditions for in-situ power generation may be: the remaining power SOC of the power battery is lower than the SOC threshold 1 or the clutch is in a disengaged state and the gear is in the P position; the identification conditions for series power generation may be: the remaining power SOC of the power battery is lower than The SOC threshold is 3 and the vehicle speed is lower than the vehicle speed threshold 1 or the clutch is disengaged and the gear is not in the P gear; the identification conditions of the hybrid power generation can be: the remaining power of the power battery SOC is lower than the SOC threshold 5 and the vehicle speed is lower than the vehicle speed Threshold 3 or clutch is engaged and the gear is not P;

When the remaining power SOC of the vehicle power battery is lower than the SOC threshold 1 or the clutch is in the disengaged state and the gear is in the P gear, the current power generation condition of the vehicle is in-situ power generation; when the remaining power SOC of the power battery is lower than the SOC threshold 3 And when the vehicle speed is lower than the vehicle speed threshold 1 or the clutch is in the disengaged state and the gear is not in P gear, the power generation condition of the vehicle is series power generation; when the remaining power SOC of the power battery is lower than the SOC threshold 5 and the vehicle speed is lower than the vehicle speed threshold 3 or when the clutch is in the engaged state and the gear is not in the P gear, the power generation condition of the vehicle is hybrid power generation.

S402, acquiring a power generation strategy matching the power generation conditions.

In the embodiment of the present invention, different power generation conditions may require different control of the power generation mode. Therefore, a mapping relationship between the power generation conditions and the power generation control strategy is established in advance. After the power generation conditions are acquired, the above mapping relationship can be queried to obtain a power generation control strategy matching the control requirement acquired in the above S401.

S403, performing power generation control according to the power generation strategy.

After obtaining the electric control strategy, the electric control strategy can be used to control the power generation.

When the power generation condition is in-situ power generation, the engine drives the belt drive motor BSG through the belt to generate small power to meet the static electricity demand of the whole vehicle or store the excess electricity in the power battery; the SOC is higher than the SOC threshold 2 , stop power generation. The clutch 4 is disengaged.

When the power generation condition is series power generation, the engine drives the belt drive motor BSG to generate power through the belt, and the power generation can be dynamically changed according to the demand of the whole vehicle to make up for the power consumption when the vehicle runs in series or store the excess power into the power In the battery; when the SOC is higher than the SOC threshold 4 or the vehicle speed is higher than the vehicle speed threshold 2, the power generation is stopped. The clutch is disengaged.

When the power generation condition is hybrid power generation, the engine drives the belt drive motor BSG through the belt to generate power and provides power output, and the power generation can be dynamically changed according to the demand of the whole vehicle to make up for the power consumption under the hybrid driving of the whole vehicle or Store the excess power in the power battery; the SOC is higher than the SOC threshold of 6 to stop generating electricity. The clutch 4 is engaged.

In the embodiment of the present invention, since the BSG and the BSG controller are added to the power system, the power system can realize the full power generation condition, and different power generation strategies are adopted under different power generation conditions, so that the power generation of the vehicle is more flexible. Different strategies for power generation in different situations can make the power generation of the vehicle more reasonable and improve the power generation efficiency of the vehicle.

In order to clearly illustrate the above embodiments, the following detailed description will be made with reference to FIG. 6 .

FIG. 6 is a schematic flowchart of a control method of a vehicle power control system according to another embodiment of the present invention. As shown in FIG. 6 , the control method of the vehicle power control system includes the following steps:

S501, start.

S502: Acquire state information of the vehicle during driving.

For the specific introduction of S502, reference may be made to the description of the relevant content in the above-mentioned embodiment S101, and details are not repeated here.

S503, judging whether power generation is allowed.

In this embodiment of the present invention, the condition for allowing discharge may be that the BSG is not faulty.

If the BSG is faulty, the discharge is not allowed, and the process goes to step S513; if the BSG is not faulty, the discharge is allowed, and the process goes to step S504.

S504, it is judged whether to generate electricity in situ.

If yes, go to step S507; if no, go to step S505.

For the specific introduction of the foregoing S504, reference may be made to the description of the relevant content in the foregoing embodiment, which will not be repeated here.

S505, it is judged whether to generate electricity in series.

If yes, go to step S509; if no, go to step S506.

For the specific introduction of the foregoing S505, reference may be made to the description of the relevant content in the foregoing embodiment, which will not be repeated here.

S506, it is judged whether the hybrid power generation is performed.

If yes, go to step S511; if no, go to step S513.

For the specific introduction of the foregoing S506, reference may be made to the description of the relevant content in the foregoing embodiment, which will not be repeated here.

S507, the engine drives the belt drive motor BSG through the belt to generate small power to meet the electricity demand of the vehicle under static conditions or store the excess electricity in the power battery;

S508, when the SOC is higher than the SOC threshold 2, the power generation is stopped. The clutch 4 is disengaged.

S509, the engine drives the belt drive motor BSG to generate electricity through the belt, and the power generation can be dynamically changed according to the demand of the whole vehicle to make up for the electricity consumption when the whole vehicle is driven in series or store the excess electricity in the power battery.

S510, when the SOC is higher than the SOC threshold 4 or the vehicle speed is higher than the vehicle speed threshold 2, the power generation is stopped. The clutch is disengaged.

S511, the engine drives the belt drive motor BSG through the belt to generate power while providing power output. The power generation can be dynamically changed according to the demand of the whole vehicle to make up for the power consumption under the hybrid driving of the whole vehicle or store the excess power in the power battery middle.

S512, the SOC is higher than the SOC threshold 6, and the power generation is stopped. The clutch 4 is engaged.

S513, do not generate electricity.

S514, end.

According to the control method of the vehicle power system proposed in the embodiment of the present invention, the BSG is controlled based on the control requirements, and different requirements of the engine are realized through the BSG, so that the low-voltage starter can no longer be simply relied on, and the starting of the engine using the low-voltage starter can be reduced. Or pull to stop, etc., so as to avoid reducing the life of the low-voltage starter and reducing the response to vehicle performance. In addition, the low-voltage starter is not used to start or stop the engine, which can reduce noise output, reduce noise pollution to the environment, and improve vehicle drivability and user experience. In addition, a power generation strategy matching the power generation conditions can be obtained according to the power generation working conditions, and power generation control can be performed according to the power generation strategy, which can improve the power generation efficiency of the vehicle and realize power generation under all working conditions.

FIG. 7 is a structural diagram of a control device of a vehicle power system according to an embodiment of the present invention. Used in the power system of the vehicle, the power system includes: the belt drive motor BSG and the BSG controller; the BSG is connected with the engine in the power system through the belt, the BSG controller is respectively connected with the BSG and the high-voltage components in the power system, and the BSG controls The device is connected with the power battery in the power system through the main contactor in the power system;

As shown in Figure 7, the control device of the vehicle power system includes:

an acquisition module 21, configured to acquire state information during the driving process of the vehicle;

The determination module 22 is used to determine the current control demand of the vehicle according to the state information; wherein, the control demand at least includes: starting the engine, pulling the engine to stop and assisting the engine;

The first control module 23 is configured to control the BSG according to control requirements.

It should be noted that, the foregoing explanations of the embodiment of the control method of the vehicle power system are also applicable to the control device of the vehicle power system of this embodiment, and will not be repeated here.

The control method of the vehicle power system provided by the embodiment of the present invention obtains the state information during the running process of the vehicle; according to the state information, the current control demand of the vehicle is determined; wherein, the control demand at least includes: starting the engine, pulling the engine to stop, and assisting the engine , and control the BSG according to the control requirements. In this embodiment, the BSG is controlled based on the control requirements, and the different requirements of the engine are realized through the BSG, so that the low-voltage starter can no longer be simply relied on, and the start or pull-stop of the engine by using the low-voltage starter can be reduced, so as to avoid reducing the Low voltage starter life, reduced response to vehicle performance. In addition, the low-voltage starter is not used to start or stop the engine, which can reduce noise output, reduce noise pollution to the environment, and improve vehicle drivability and user experience.

Further, the first control module 23 is further configured to: when the control demand is to start the engine, control the BSG to output the first forward torque to pull up the engine through the forward first torque; after the engine is successfully ignited, control the BSG to stop the output the forward first torque.

Further, in a possible implementation manner of the embodiment of the present invention, the first control module 23 is specifically configured to: when the control demand is to pull and stop the engine, control the BSG to output a reverse torque, so as to pull and stop the engine through the reverse torque ; Control the electric energy output by the motor in the recovery power system during the engine pull-stop process; detect the engine speed, and control the BSG to stop outputting the reverse torque when the speed drops to the set value.

Further, in a possible implementation manner of the embodiment of the present invention, the first control module 23 is specifically configured to: when the control demand is to boost the engine, control the BSG to output the second forward torque, so as to pass the second forward torque Increase the torque of the engine; detect whether the current torque of the engine exceeds the preset torque, if the current torque exceeds the preset torque, control the BSG to stop outputting the positive second torque.

Further, FIG. 8 is a schematic structural diagram of another control device of a vehicle power system provided by an embodiment of the present invention. On the basis of FIG. 7 , the control device of the vehicle power system provided by the embodiment of the present invention further includes: a first fault identification module 24 , a second fault identification module 25 , a power generation control module 26 and a second control module 27 .

The first fault identification module 24 is configured to extract the state information of the BSG from the state information after acquiring the state information during the running of the vehicle, and determine that the BSG is not in a fault state according to the state information.

The second fault identification module 25 is used to detect whether the power battery fails during the driving process of the vehicle, and if a fault occurs, control to disconnect the connection between the power battery and the BSG controller.

The second control module 27 is used to control the low-voltage starter in the power system to start the engine, so as to drive the BSG to run through the engine, obtain the target voltage of the vehicle, control the BSG to output the target voltage, and input the target voltage to the high-voltage components.

The power generation control module 26 is used to identify the current power generation condition of the vehicle, obtain a power generation strategy matching the power generation condition, and perform power generation control according to the power generation strategy.

It should be noted that, the foregoing explanations of the embodiment of the control method of the vehicle power system are also applicable to the control device of the vehicle power system of this embodiment, and will not be repeated here.

The control method of the vehicle power system provided by the embodiment of the present invention obtains the state information during the running process of the vehicle; according to the state information, the current control demand of the vehicle is determined; wherein, the control demand at least includes: starting the engine, pulling the engine to stop, and assisting the engine , and control the BSG according to the control requirements. In this embodiment, the BSG is controlled based on the control requirements, and the different requirements of the engine are realized through the BSG, so that the low-voltage starter can no longer be simply relied on, and the start or pull-stop of the engine by using the low-voltage starter can be reduced, so as to avoid reducing the Low voltage starter life, reduced response to vehicle performance. In addition, the low-voltage starter is not used to start or stop the engine, which can reduce noise output, reduce noise pollution to the environment, and improve vehicle drivability and user experience. The vehicle can obtain the power generation strategy matching the power generation conditions according to the power generation conditions, and control the power generation according to the power generation strategy, which can improve the power generation efficiency of the vehicle and realize the power generation under all working conditions. In addition, a power generation strategy matching the power generation conditions can be obtained according to the power generation working conditions, and power generation control can be performed according to the power generation strategy, which can improve the power generation efficiency of the vehicle and realize power generation under all working conditions.

In order to realize the above embodiments, the embodiments of the present invention further provide a vehicle 200, as shown in FIG. 9, including the control device 100 of the vehicle power system shown in the above embodiments.

In order to realize the above-mentioned embodiment, the embodiment of the present invention further provides an electronic device. As shown in FIG. 10 , the electronic device includes a memory 31 and a processor 32 . The memory 31 stores a computer program that can run on the processor 32, and the processor 32 executes the program to implement the control method of the vehicle power system as shown in the above embodiments.

In order to realize the above embodiments, the embodiments of the present invention further provide a non-transitory computer-readable storage medium, on which a computer program is stored, and the program is executed by a processor, so as to realize the vehicle power as shown in the above embodiments system control method.

In the description of this specification, description with reference to the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples", etc., mean specific features described in connection with the embodiment or example , structure, material or feature is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, those skilled in the art may combine and combine the different embodiments or examples described in this specification, as well as the features of the different embodiments or examples, without conflicting each other.

Although the embodiments of the present invention have been shown and described above, it should be understood that the above-mentioned embodiments are exemplary and should not be construed as limiting the present invention. Embodiments are subject to variations, modifications, substitutions and variations.

Claims (17)

1. A control method for a vehicle power system, wherein the vehicle power system comprises: a belt drive motor BSG and a BSG controller; the BSG is connected to an engine in the power system through a belt, and the BSG controller are respectively connected with the BSG and the high-voltage components in the power system, and the BSG controller is connected with the power battery in the power system through the main contactor in the power system; The method includes the following steps: obtaining state information during the driving of the vehicle; According to the state information, the current control demand of the vehicle is determined; wherein, the control demand includes at least one of starting the engine, stopping the engine, and assisting the engine; The BSG is controlled according to the control requirement. 2 . The method for controlling a vehicle power system according to claim 1 , wherein when the control demand is to start the engine, the controlling the BSG according to the control demand comprises: 2 . controlling the BSG to output a forward first torque to pull up the engine with the forward first torque; After the engine is successfully ignited, the BSG is controlled to stop outputting the forward first torque. 3 . The method for controlling a vehicle power system according to claim 1 , wherein when the control demand is to pull and stop the engine, the controlling the BSG according to the control demand comprises: 3 . controlling the BSG to output a reverse torque to pull and stop the engine through the reverse torque; Controlling and recovering the electrical energy output by the motor in the power system during the process of pulling and stopping the engine; The rotational speed of the engine is detected, and when the rotational speed is reduced to a set value, the BSG is controlled to stop outputting the reverse torque. 4 . The control method of the vehicle power system according to claim 1 , wherein when the control demand is to boost the engine, the controlling the BSG according to the control demand comprises: controlling the BSG to output a second forward torque to boost the torque of the engine by the second forward torque; It is detected whether the current torque of the engine exceeds a preset torque, and if the current torque exceeds the preset torque, the BSG is controlled to stop outputting the forward second torque. 5 . The method for controlling a vehicle power system according to claim 1 , wherein after acquiring the state information during the driving of the vehicle, the method further comprises: 6 . The state information of the BSG is extracted from the state information, and according to the state information, it is determined that the BSG is not in a fault state. 6. The control method of the vehicle power system according to any one of claims 1-4, characterized in that, further comprising: During the driving process of the vehicle, detect whether the power battery fails, and if a failure occurs, control to disconnect the connection between the power battery and the BSG controller; controlling a low-voltage starter in the power system to start the engine, so as to drive the BSG to operate through the engine; The target voltage of the vehicle is acquired, the BSG is controlled to output the target voltage, and the target voltage is input to the high-voltage component. 7. The control method of the vehicle power system according to any one of claims 1-4, characterized in that, further comprising: Identifying the current power generation working condition of the vehicle, acquiring a power generation strategy matching the power generation working condition, and performing power generation control according to the power generation strategy. 8. A control device for a vehicle power system, characterized in that it is used in the power system of the vehicle, the power system comprising: a belt drive motor BSG and a BSG controller; the BSG and the power system The engine is connected by a belt, the BSG controller is respectively connected with the BSG and the high voltage components in the power system, the BSG controller and the power battery in the power system are connected through the main contact in the power system device connection; The control device of the vehicle power system, comprising: an acquisition module, used to acquire the state information during the driving process of the vehicle; a determination module, configured to determine the current control demand of the vehicle according to the state information; wherein, the control demand at least includes: starting the engine, pulling the engine to stop, and assisting the engine; A first control module, configured to control the BSG according to the control requirement. 9 . The control device of the vehicle power system according to claim 8 , wherein the first control module is specifically used for: When the control demand is to start the engine, controlling the BSG to output a forward first torque to pull up the engine by the forward first torque; After the engine is successfully ignited, the BSG is controlled to stop outputting the forward first torque. 10. The control device of the vehicle power system according to claim 8, wherein the first control module is specifically used for: When the control demand is to pull and stop the engine, control the BSG to output a reverse torque, so as to pull and stop the engine through the reverse torque; Controlling and recovering the electrical energy output by the motor in the power system during the process of pulling and stopping the engine; The rotational speed of the engine is detected, and when the rotational speed is reduced to a set value, the BSG is controlled to stop outputting the reverse torque. 11. The control device of the vehicle power system according to claim 8, wherein the first control module is specifically used for: When the control demand is to boost the engine, controlling the BSG to output a second forward torque to boost the torque of the engine through the second forward torque; It is detected whether the current torque of the engine exceeds a preset torque, and if the current torque exceeds the preset torque, the BSG is controlled to stop outputting the forward second torque. 12. The control device of the vehicle power system according to any one of claims 8-11, characterized in that, further comprising: The first fault identification module is configured to extract the state information of the BSG from the state information after acquiring the state information during the running of the vehicle, and determine that the BSG is not in a fault state according to the state information. 13. The control device of the vehicle power system according to any one of claims 8-11, characterized in that, further comprising: a second fault identification module, configured to detect whether the power battery fails during the driving process of the vehicle, and if a fault occurs, control to disconnect the connection between the power battery and the BSG controller; A second control module, configured to control a low-voltage starter in the power system to start the engine, obtain the target voltage of the vehicle by driving the BSG to run by the engine, and control the BSG to output the target voltage , and input the target voltage into the high voltage component. 14. The control device of the vehicle power system according to any one of claims 8-11, characterized in that, further comprising: The power generation control module is configured to identify the current power generation working condition of the vehicle, obtain a power generation strategy matching the power generation working condition, and perform power generation control according to the power generation strategy. 15. A vehicle, characterized in that, comprising: the control device of the vehicle power system according to any one of claims 8-14. 16. An electronic device, comprising a memory and a processor; Wherein, the processor runs a program corresponding to the executable program code by reading the executable program code stored in the memory, so as to realize the vehicle power according to any one of claims 1-7 system control method. 17. A non-transitory computer-readable storage medium on which a computer program is stored, characterized in that, when the program is executed by a processor, the control method for a vehicle power system according to any one of claims 1-7 is implemented .

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