Drive mode switching control method and apparatus for hybrid vehicle

Abstract

The present application relates to the technical field of drive mode switching control for vehicles. Disclosed are a drive mode switching control method and apparatus for a hybrid vehicle. The technical solution of the present application comprises: when a hybrid vehicle executes drive mode switching, determining whether to execute a locking control action on an engine of the hybrid vehicle; and when it is determined that it is necessary to execute a locking control action, driving a generator of the hybrid vehicle to output a preset torque to the engine, controlling a preset locking control actuator to execute a locking control action, and enabling the generator to cooperate with the locking control actuator to complete the locking control action. The method strategy can enable a locking action for controlling an engine to stop rotating and an unlocking action for controlling the engine to start operating to be executed more smoothly, such that the collision loss of mechanical components during execution of a locking control action is reduced, thereby improving the reliability of a hybrid vehicle during drive mode switching.

Description

Hybrid vehicle driving mode switching control method and device Cross-reference to related applications

[0001] This application claims priority to Chinese Patent Application No. 202410780848.4, filed on June 18, 2024, the entire contents of which are incorporated herein by reference. TECHNICAL FIELD

[0002] The present application relates to the technical field of vehicle driving mode switching control, and in particular to a hybrid vehicle driving mode switching control method and device. BACKGROUND

[0003] A hybrid vehicle refers to a vehicle driven by two or more power sources, the most common being a hybrid electric vehicle. It combines an internal combustion engine and a drive motor to improve fuel economy and vehicle maneuverability through the coordinated work of the engine and the drive motor. The driving modes of a hybrid vehicle usually include pure electric driving mode, fuel driving mode, extended range driving mode, and hybrid mode driven by the engine and the motor. When the driving mode is switched, the power output of the engine needs to be locked or unlocked based on the power distribution requirements. The existing locking or unlocking method is implemented by an electromagnetic clutch, and direct locking or unlocking may cause mechanical component damage.

[0004] Therefore, how to improve the reliability of the hybrid vehicle during the driving mode switching process is a technical problem to be solved at present. SUMMARY

[0005] The hybrid vehicle driving mode switching control method and device provided by the present application improve the reliability of the hybrid vehicle during the driving mode switching process.

[0006] The technical solution of the present application provides the following scheme:

[0007] In a first aspect, the technical solution of the present application provides a hybrid vehicle driving mode switching control method, which comprises:

[0008] When the hybrid vehicle performs driving mode switching, it is determined whether to perform a lock control action on the engine of the hybrid vehicle, wherein the lock control action includes a lock action of controlling the engine to stop rotating and an unlock action of controlling the engine to start operating;

[0009] If yes, the generator driving the hybrid vehicle outputs a preset torque to the engine, and controls a preset lock control execution mechanism to perform a lock control action; the generator cooperates with the lock control execution mechanism to complete the lock control action, so as to realize the switching of the driving mode.

[0010] In an alternative technical solution, the lock control actuator includes a first lock control mechanism for obliquely locking the outer teeth of the flywheel of the engine, and the lock control angle between the first lock control mechanism and the outer teeth of the flywheel is less than 90°; the generator driving the hybrid vehicle outputs a preset torque to the engine, and controls the preset lock control actuator to perform a lock control action, including:

[0011] When the lock control action is a locking action, the first lock control mechanism is controlled to perform the locking action, so that the first support rod of the first lock control mechanism tightly abuts the outer teeth of the flywheel;

[0012] According to the preset torque, the generator is controlled to drive the flywheel of the engine to rotate in a locking direction corresponding to the locking action;

[0013] When the rotation state of the flywheel meets a first preset condition, the generator is controlled to stop rotating, wherein the first preset condition at least includes that the detection results of the flywheel in adjacent position detection cycles are the same;

[0014] When the lock control action is an unlocking action, the generator is controlled to drive the flywheel to rotate in an unlocking direction corresponding to the unlocking action according to the preset torque;

[0015] When the rotation state of the flywheel meets a second preset condition, the first lock control mechanism is controlled to perform the unlocking action, wherein the second preset condition at least includes that the rotation distance of the flywheel in the unlocking direction is greater than a first preset value.

[0016] In an alternative technical solution, the lock control actuator further includes a second lock control mechanism for obliquely locking the outer teeth of the flywheel, and the second lock control mechanism is mirror-imaged with the first lock control mechanism along the radial direction of the flywheel; after the generator is controlled to stop rotating when the rotation state of the flywheel meets the first preset condition, the method further includes:

[0017] The second lock control mechanism is controlled to perform the locking action, so that the second support rod of the second lock control mechanism tightly abuts the outer teeth of the flywheel;

[0018] The generator is controlled to drive the flywheel to rotate in an unlocking direction corresponding to the unlocking action;

[0019] When the rotation state of the flywheel meets the first preset condition, the generator is controlled to stop rotating.

[0020] In an alternative technical solution, the lock control actuator further includes a second lock control mechanism for obliquely locking the outer teeth of the flywheel, and the second lock control mechanism is mirror-imaged with the first lock control mechanism along the radial direction of the flywheel; after the first lock control mechanism is controlled to perform the unlocking action, the method further includes:

[0021] The second lock control mechanism is controlled to perform the unlocking action, so that the second support rod of the second lock control mechanism is reset and retracted when the engine starts to operate.

[0022] In an alternative technical solution, after the generator cooperates with the lock control actuator to perform the locking action, the method further comprises:

[0023] determining whether the generator is in the working state for the wheel end output torque in the current drive mode;

[0024] If not, the method further comprises:

[0025] controlling the generator to output a locking torque to the lock control actuator, so that the flywheel of the engine and the brace of the lock control actuator are in a close state during the driving process of the hybrid vehicle.

[0026] In an alternative technical solution, after the generator cooperates with the lock control actuator to perform the locking action, the method further comprises:

[0027] determining whether the generator is switched to the working state;

[0028] If yes, the method further comprises:

[0029] controlling the generator to output a wheel end output torque according to the locking torque and a preset torque output curve, wherein the torque output curve is a curve of the output torque of the generator changing with the output time.

[0030] In an alternative technical solution, the lock control actuator comprises a first lock control mechanism for oblique locking of the outer teeth of the flywheel of the engine, and the lock control angle between the first lock control mechanism and the outer teeth of the flywheel is greater than 90°. After the generator cooperates with the lock control actuator to output the locking torque, the method further comprises:

[0031] determining whether to perform an unlocking action on the engine;

[0032] If yes, the method further comprises:

[0033] controlling the generator to stop outputting the locking torque to the lock control actuator, and controlling the lock control actuator to perform the unlocking action.

[0034] In a third aspect, the present application also provides an electronic device, comprising a processor and a memory, the memory being coupled to the processor, and the memory storing instructions which, when executed by the processor, cause the electronic device to perform the steps of any of the methods of the first aspect.

[0035] In a fourth aspect, the present application also provides a computer-readable storage medium having stored thereon a computer program which, when executed by a processor, implements the steps of any of the methods of the first aspect.

[0036] The hybrid vehicle driving mode switching control method and device of the present application have the following advantages compared with the prior art:

[0037] The technical solution of the present application determines whether to perform a lock control action on the engine of the hybrid vehicle when the hybrid vehicle performs driving mode switching, and when it is determined that the lock control action needs to be performed, the generator of the hybrid vehicle outputs a preset torque to the engine, and a preset lock control execution mechanism is controlled to perform the lock control action; the generator cooperates with the lock control execution mechanism to complete the lock control action. This method strategy can control the locking action of stopping the rotation of the engine and the unlocking action of enabling the operation of the engine to be executed more smoothly, reduces the collision loss of mechanical parts during the execution of the lock control action, and thus improves the reliability of the hybrid vehicle during driving mode switching. BRIEF DESCRIPTION OF DRAWINGS

[0038] In order to more clearly illustrate the technical solutions in the specification or the prior art, the following will briefly introduce the drawings needed to be used in the technical solutions. Obviously, the drawings described below are only some of the technical solutions of the present specification, and those skilled in the art can also obtain other drawings according to these drawings without any creative effort.

[0039] FIG. 1 is a flowchart of the hybrid vehicle driving mode switching control method provided by the present application;

[0040] FIG. 2 is a schematic diagram of the power architecture of the hybrid vehicle provided by the present application;

[0041] FIG. 3 is a schematic diagram of the structure of the lock control execution mechanism and the flywheel provided by the present application;

[0042] FIG. 4 is a schematic diagram of the structure of the lock control execution mechanism and the flywheel provided by the present application;

[0043] FIG. 5 is a schematic diagram of the structure of the hybrid vehicle driving mode switching control device provided by the present application.

[0044] Legend: 1 - first lock control mechanism, 2 - flywheel, 3 - second lock control mechanism, 11 - first support rod, 21 - flywheel outer tooth, 31 - second support rod. DETAILED DESCRIPTION

[0045] The technical solutions in the present application will be described in detail below with reference to the drawings in the technical solutions in the present application. Obviously, the described technical solutions are only part of the technical solutions in the present application, but not all the technical solutions in the present application. Based on the technical solutions in the present application, all other technical solutions obtained by those skilled in the art belong to the scope of protection of the technical solutions in the present application.

[0046] Please refer to FIG. 1, which is a flow chart of a hybrid vehicle driving mode switching control method provided by the present application. The control method can be applied to an automatic transmission control unit (TCU) to implement driving mode switching of a vehicle, or can be applied to other devices capable of running the control method, which is not specifically limited here. The control method comprises:

[0047] S11, when the hybrid vehicle performs driving mode switching, it is determined whether to perform a lock control action on the engine of the hybrid vehicle, wherein the lock control action includes a lock action of controlling the engine to stop rotating, and an unlock action of controlling the engine to start operating.

[0048] Specifically, a plurality of drive units are configured on the hybrid vehicle. Please refer to FIG. 2, which is a schematic diagram of the power architecture of a hybrid vehicle. The plurality of drive units include an engine, a generator and a drive motor. The engine is drivingly connected to a planet carrier through a reducer, the generator is drivingly connected to a sun gear, and a synchronizer S1 and a synchronizer S2 are arranged between the engine and the generator. The TCU is connected to a shift hub, the shift hub controls the synchronizer S1 and the synchronizer S2, the synchronizer S1 controls the speed ratio of the ring gear to the wheel end, and the synchronizer S2 controls the speed ratio of the planet carrier. The driving modes of the hybrid vehicle include a fuel driving mode, a pure electric driving mode, a hybrid mode and an extended range mode, etc. In the fuel driving mode, the vehicle is driven to travel by the engine; in the pure electric driving mode, the vehicle can be driven to travel by the generator or / and the drive motor, and the engine is locked; in the extended range mode, the vehicle is driven to travel by the drive motor, and the engine is controlled to drive the generator to generate electricity; in the hybrid mode, the vehicle is driven to travel by the engine and the drive motor, and the engine and the generator provide torque to the wheel end together. When the synchronizer S2 is in the middle position, the engine and the generator are not locked, the speed ratio of the ring gear to the wheel end is adjusted through the synchronizer S1, that is, the main reduction ratio is switched, to realize power split of different speed ratios, and power split assist and power generation can be realized in this mode.

[0049] The engine needs to be locked or unlocked when the different driving modes are implemented. The engine cannot run after being locked, and the hybrid vehicle can run in the pure electric driving mode or implement energy recovery. The engine can be started after being unlocked, and the hybrid vehicle can run in the hybrid mode. It should be noted that the transmission path between the synchronizer S1 and the differential is decoupled in the extended range mode, the engine is started to drive the generator to generate electricity, and the motor drives the hybrid vehicle to run. Therefore, whether the engine performs the locking action or the unlocking action can be determined based on the switching of each mode, for example, when the hybrid mode is switched to the pure electric mode driven by the dual motor, the engine needs to perform the locking action; when the pure electric mode is switched to the hybrid mode or the fuel mode, the engine needs to perform the unlocking action. The object of the locking action and the unlocking action can be the flywheel of the engine or the transmission shaft output to the carrier of the engine, which can make the engine reach the corresponding state. When it is determined that the engine of the hybrid vehicle does not perform the locking control action, the detection is continued at a preset period; otherwise, when it is determined that the engine of the hybrid vehicle performs the locking control action, step S12 is entered.

[0050] S12, if yes, the generator driving the hybrid vehicle outputs a preset torque to the engine, and controls the preset locking control execution mechanism to perform the locking control action; the generator cooperates with the locking control execution mechanism to complete the locking control action, so as to realize the switching of the driving mode.

[0051] Specifically, the generator is in transmission connection with the engine, and the transmission speed ratio of the generator and the engine can be controlled through the synchronizer S2, so that the two are in different working conditions, such as the power generation working condition and the no-load working condition of the generator. The locking control execution mechanism can be a mechanical locking control mechanism. Through the locking control execution mechanism, the flywheel of the engine can be locked or unlocked. Since the coupling of mechanical parts is involved when the locking control action is performed, if the locking control action is directly performed, the direct collision of the mechanical parts may be caused, which leads to the damage of the parts or reduces the service life of the parts. After the generator outputs the preset torque to the engine, the engine can be slowly rotated, and the rotating state achieves the controllable purpose through the preset torque. The coupling or separation of the mechanical parts is smoother when the locking control action is performed, the acting force of the mutual impact between the mechanical parts in the driving mode switching process is reduced, and the reliability of the hybrid vehicle in the driving mode switching process is improved.

[0052] The lock control actuating mechanism can be a telescopic mechanism, for example, at least one locking blind hole is arranged on the outer periphery of the flywheel of the engine, when a plurality of locking blind holes are arranged, the plurality of locking blind holes are arranged in a ring shape around the center of the flywheel, the depth direction of the locking blind hole is the radial direction of the flywheel, the telescopic mechanism includes a solenoid valve, a valve core rod is arranged in the middle of the solenoid valve, when the solenoid valve is powered on, the valve core rod extends into the locking blind hole to realize the locking of the engine; when the solenoid valve is not powered on, the valve core rod is located outside the locking blind hole, and the engine can be started to run. Since the locking blind hole is arranged on the outer periphery of the flywheel, after the engine stops running, the locking action can be performed, so that the valve core rod is tightly attached to the outer periphery of the flywheel, and the generator of the hybrid vehicle drives the engine to output a preset torque, the flywheel slowly rotates, and the locking action is completed when the locking blind hole and the valve core rod are located on the same straight line.

[0053] In actual application, the lock control actuating mechanism is installed on the shell of the gearbox through fasteners, if the flywheel is locked in the radial direction, the flywheel has a large transverse force on the fasteners, which is easy to damage or even break the fasteners. Based on this, in order to realize the reliable locking of the engine, the present application proposes an oblique locking scheme, please refer to FIG. 3, which is a structural schematic diagram of the lock control actuating mechanism and the flywheel, the lock control actuating mechanism includes a first lock control mechanism 1 for oblique locking of the outer teeth of the flywheel of the engine, and the lock control angle a between the first lock control mechanism 1 and the outer teeth 21 of the flywheel is greater than 90°; the outer teeth 21 are machined on the outer periphery of the flywheel 2 of the engine, and a plurality of outer teeth 21 are arranged in a ring shape along the outer periphery of the flywheel, and the purpose of locking is achieved by engaging the outer teeth of the flywheel through the lock control actuating mechanism. The first lock control mechanism 1 includes a shell, a solenoid valve, a first support rod 11 and a spring, etc., the shell is installed through fasteners, the installation angle of the fastener is the same as the angle of the first support rod 11 in the locked state, the middle part of the first support rod is installed in the shell, the first support rod can rotate along the middle part, one end of the first support rod is close to the solenoid valve, and the other end is close to the spring. When the solenoid valve is not actuated, the first support rod is not pushed out by the spring, and the flywheel is in an unlocked state; when the solenoid valve is actuated, the valve core rod moves away from one end of the first support rod, the first support rod is pushed out by the spring, and when the pushed-out part of the first support rod is in contact with the outer teeth of the flywheel, the engine is in a locked state, and the lock control angle a represents the contact angle of the first support rod and the outer teeth of the flywheel in the locked state of the engine.

[0054] Please continue to refer to Figure 3, when the lock control angle a is greater than 90°, the end of the first support rod 11 is an obtuse angle, although the engine can be locked, but the locking position exists upward force, that is, the first support rod 11 and the fitting part of the flywheel outer tooth 21 exist flywheel outer diameter direction force, this structure can better implement the unlocking action. After locking the flywheel, in order to reduce the damage of flywheel swing to the first support rod, the generator can control the output of the locking torque of the locking control actuator, so that the first support rod and the flywheel tooth remain in the state of sticking, and whether to execute the unlocking action is judged in real time; When it is determined that the unlocking action needs to be executed, the generator stops outputting the locking torque of the locking control actuator, and controls the locking control actuator to execute the unlocking action. Because the lock control angle a is greater than 90°, after the generator unloads the torque, the first support rod can immediately disengage to realize unlocking. Under the locking torque, the flywheel remains in a fixed state, and the flywheel tooth does not collide with the first support rod, so that the hybrid vehicle has good NVH performance.

[0055] In order to further improve the reliability of the engine after locking, and improve the NVH (Noise, Vibration, Harshness, noise, vibration, and harshness) performance of the hybrid vehicle, a second locking control mechanism 3 can be provided, which is mirror image with the first locking control mechanism 1 along the radial direction of the flywheel 2. After locking the flywheel by the first locking mechanism 1, the second support rod 31 of the second locking control mechanism 3 is controlled to pop out. Please continue to refer to Figure 3, the A direction is the rotation direction of the flywheel when the engine is working. When the locking action is executed, the first support rod 11 of the first locking control mechanism 1 can be controlled to fall down, the generator can be controlled to pull the engine to rotate in the B direction, and whether the flywheel 2 has a moving distance can be detected. When the first support rod 11 is in close contact with the flywheel tooth 21, the flywheel 2 has no moving distance. The second support rod 31 of the second locking control mechanism 3 is controlled to fall down, the generator is controlled to pull the engine to rotate in the B direction, and whether the flywheel 2 has a moving distance is detected. When the second support rod 31 is in close contact with the flywheel tooth 21, the flywheel 2 has no moving distance. The moving stroke of the flywheel 2 is between the first support rod 11 and the second support rod 31, and it is determined that the locking action is completed. This locking method can reduce the moving range of the flywheel 2 swing, and improve the NVH performance of the hybrid vehicle.

[0056] As described above, although the unlocking action is simpler when the lock control angle a is greater than 90°, the locking may fail when the flywheel torque is too large. Therefore, the lock control angle between the first locking control mechanism and the flywheel tooth is less than 90°. Please refer to Figure 4, which is a second structure diagram of the locking control actuator and the flywheel. The execution process of step S12 will be described in detail below, which specifically includes:

[0057] S12-1, when the lock control action is a locking action, it is explained that the flywheel needs to be controlled to be locked, and the first lock control mechanism is controlled to perform a locking action, so that the first support rod of the first lock control mechanism is in close contact with the outer teeth of the flywheel. After the first support rod falls, the end thereof can be in close contact with the tooth top circle or the tooth root circle of the flywheel, at which time the flywheel is not completely locked.

[0058] S12-2, the flywheel of the generator driving the engine is controlled to rotate in the locking direction corresponding to the locking action according to a preset torque. The preset torque can be set based on actual needs, for example, 5 N·m, which can make the generator slowly drive the engine to rotate. A direction shown in FIG. 4 is the locking direction of the engine. In the rotating process of the flywheel, the end of the first support rod gradually approaches the outer teeth of the flywheel. In the rotating process of the flywheel, whether the flywheel has a rotating displacement is detected in real time by a position sensor.

[0059] S12-3, the generator is controlled to stop rotating when the rotating state of the flywheel meets a first preset condition. The first preset condition at least includes that the detection results of adjacent position detection cycles are the same. When the detection results of adjacent position detection cycles are the same, it is explained that the flywheel has no rotation, the first support rod is completely in close contact with the outer teeth of the flywheel, and if the rotating continues, the first lock control mechanism can be damaged. Therefore, the generator is controlled to stop rotating. A rotating speed sensor is arranged on the transmission path of the flywheel. When the rotating speed sensor no longer outputs a signal, it is explained that the rotating state meets the first preset condition. It can be understood that setting the lock control angle to be less than 90° can effectively ensure that the first support rod and the outer teeth of the flywheel are in close contact and then generate a self-locking effect, so as to prevent the flywheel from pushing out the first support rod.

[0060] Similarly, for the lock control execution mechanism with the lock control angle less than 90°, a second lock control mechanism can also be arranged to implement locking, and the second lock control mechanism is arranged in mirror image with the first lock control mechanism along the radial direction of the flywheel. After the generator is controlled to stop rotating when the rotating state of the flywheel meets the first preset condition, the control method further includes:

[0061] The second lock control mechanism is controlled to perform a locking action, so that the second support rod of the second lock control mechanism is in close contact with the outer teeth of the flywheel. After the locking action is performed, in order to determine that the second support rod is located on the tooth root circle of the flywheel, the generator is controlled to drive the flywheel to rotate in the unlocking direction corresponding to the unlocking action. When the rotating state of the flywheel meets the first preset condition, it is explained that the outer teeth of the flywheel are in close contact with the second support rod, and the generator is controlled to stop rotating. It can be understood that, since the lock control angle is less than 90°, after locking, the static friction between the support rod and the outer teeth of the flywheel is generated, and the locking has better reliability.

[0062] The movement stroke of the flywheel can be controlled between the first support rod and the second support rod by locking of the first locking control mechanism and the second locking control mechanism, and if the flywheel swings, the first support rod and the second support rod will be impacted and damaged. Based on this, in a specific embodiment, after the generator cooperates with the locking control execution mechanism to perform the locking action, the control method further comprises:

[0063] It is determined whether the generator is in the working state of outputting the torque to the wheel end in the current driving mode. The current driving mode can be a mode in which the generator and the driving motor jointly output power to the wheel end, and in this mode, when the output torque of the driving motor is insufficient, the generator assists the driving motor to supplement power. If the generator is in the working state of outputting the torque to the wheel end, no other task is performed. Conversely, if the generator is not in the working state of outputting the torque to the wheel end, in order to prevent the flywheel from reciprocating in the gap between the first support rod and the second support rod, the locking torque is output to the locking control execution mechanism by the generator, so that the flywheel of the engine and the support rod of the locking control execution mechanism are in close contact during the driving of the hybrid vehicle. The locking torque can be set based on actual requirements, for example, 2 N·m, which can make the outer gear of the flywheel tightly contact the first support rod or the second support rod. Since the locking torque exists, the flywheel will not reciprocate during the driving of the hybrid vehicle, and thus the NVH performance of the hybrid vehicle is further improved.

[0064] In actual application, the generator is in an intermittent working state based on the wheel end demand torque. After stopping outputting the torque to the wheel end, if the torque is output too fast, mechanical impact can also be caused. Based on this, in a specific embodiment, after the locking torque is output to the locking control execution mechanism by the generator, the method further comprises:

[0065] It is determined whether the generator is switched to the working state. Whether the generator needs to be enabled can be determined based on the wheel end demand torque and the output torque of the driving motor. When the generator is not enabled to output the torque to the wheel end, the locking torque is maintained. Conversely, when the generator needs to be enabled to output the torque to the wheel end, in order to further improve the NVH performance of the vehicle, the generator outputs the torque to the wheel end according to the locking torque and a preset torque output curve, wherein the torque output curve is a curve of the output torque of the generator changing with the output time. The torque output curve can be set based on calibration experiments, which can balance the wheel end torque demand response time requirement and the NVH performance requirement of the hybrid vehicle.

[0066] The following technical scheme of the present application will specifically set forth the implementation scheme of the hybrid vehicle performing the unlocking action when the locking angle is less than 90°.

[0067] S12-4, when the lock control action is the unlock action, the generator drives the flywheel to rotate in an unlock direction corresponding to the unlock action according to a preset torque. Please continue to refer to FIG. 4, the unlock direction rotation is the B direction shown in the figure, and since the lock control angle is less than 90°, after the flywheel rotates in the unlock direction, the first supporting rod has a space for resetting.

[0068] S12-5, when the rotation state of the flywheel meets a second preset condition, the first lock control mechanism is controlled to perform the unlock action, wherein the second preset condition at least includes that the rotation distance of the flywheel in the unlock direction is greater than a first preset value. The first preset value can be set based on the actual situation, and the flywheel can be reset normally. The rotation distance can be determined based on the displacement sensor to measure the rotation distance of the flywheel, or can be determined based on the rotation time of the flywheel, which is not limited here.

[0069] Please continue to refer to FIG. 4, the lock control execution mechanism further includes a second lock control mechanism for obliquely locking the outer gear of the flywheel, and the second lock control mechanism is mirror-imaged with the first lock control mechanism along the radial direction of the flywheel; after the first lock control mechanism performs the unlock action, the control method further includes: controlling the second lock control mechanism to perform the unlock action, so that the second supporting rod of the second lock control mechanism is reset and retracted when the engine starts to operate. After the second supporting rod is reset and retracted, the flywheel can avoid touching the second supporting rod during rotation.

[0070] Based on the same technical concept as the control method, the technical scheme of the present application also provides a hybrid vehicle driving mode switching control device. Please refer to FIG. 5, which is a structural schematic diagram of the control device. The control device includes:

[0071] The first determination module 501 is configured to determine whether to perform a lock control action on the engine of the hybrid vehicle when the hybrid vehicle performs driving mode switching, wherein the lock control action includes a locking action of controlling the engine to stop rotating and an unlocking action of controlling the engine to start operating;

[0072] The first control module 502 is configured to drive the generator of the hybrid vehicle to output a preset torque to the engine and control a preset lock control execution mechanism to perform the lock control action when the lock control action is performed on the engine; the generator cooperates with the lock control execution mechanism to complete the lock control action, so as to realize driving mode switching.

[0073] In an optional technical scheme, the lock control execution mechanism includes a first lock control mechanism for obliquely locking the outer gear of the flywheel of the engine, and the lock control angle between the first lock control mechanism and the outer gear of the flywheel is less than 90°; the first control module includes:

[0074] The first control sub-module is configured to control the first lock control mechanism to perform the locking action when the lock control action is the locking action, so that the first supporting rod of the first lock control mechanism abuts against the outer gear of the flywheel;

[0075] The second control submodule is configured to control the generator to rotate the flywheel in a locking direction corresponding to the locking action according to a preset torque when the locking control action is the locking action;

[0076] The third control submodule is configured to control the generator to stop rotating when a first preset condition is met by the rotating state of the flywheel, wherein the first preset condition at least includes that the detection results of the flywheel in adjacent position detection periods are the same.

[0077] The fourth control submodule is configured to control the generator to rotate the flywheel in an unlocking direction corresponding to the unlocking action according to a preset torque when the locking control action is the unlocking action.

[0078] The fifth control submodule is configured to control the first locking control mechanism to perform the unlocking action when a second preset condition is met by the rotating state of the flywheel, wherein the second preset condition at least includes that the rotating distance of the flywheel in the unlocking direction is greater than a first preset value.

[0079] In an optional technical solution, the locking control execution mechanism further includes a second locking control mechanism for oblique locking of the flywheel outer teeth, and the second locking control mechanism is arranged in mirror image with the first locking control mechanism along the radial direction of the flywheel; and the first control module further includes:

[0080] The sixth control submodule is configured to control the second locking control mechanism to perform the locking action, so that the second support rod of the second locking control mechanism abuts against the flywheel outer teeth.

[0081] The seventh control submodule is configured to control the generator to rotate the flywheel in the unlocking direction corresponding to the unlocking action.

[0082] The eighth control submodule is configured to control the generator to stop rotating when the first preset condition is met by the rotating state of the flywheel.

[0083] In an optional technical solution, the locking control execution mechanism further includes a second locking control mechanism for oblique locking of the flywheel outer teeth, and the second locking control mechanism is arranged in mirror image with the first locking control mechanism along the radial direction of the flywheel; and the first control module further includes:

[0084] The ninth control submodule is configured to control the second locking control mechanism to perform the unlocking action, so that the second support rod of the second locking control mechanism is reset and retracted when the engine starts to operate.

[0085] In an optional technical solution, the control device further includes:

[0086] The second determination module is configured to determine whether the generator is in an operating state of outputting the wheel end torque in the current driving mode.

[0087] The second control module is configured to control the generator to output the locking torque to the locking control actuator when the generator is not in the working state of outputting the wheel end output torque, so that the flywheel of the engine and the supporting rod of the locking control actuator are in the close state during the driving of the hybrid vehicle.

[0088] In an optional technical solution, the control device further comprises:

[0089] The third determination module is configured to determine whether the generator is switched to the working state.

[0090] The third control module is configured to control the generator to output the wheel end output torque according to the locking torque and a preset torque output curve when the generator is switched to the working state, wherein the torque output curve is a curve of the output torque of the generator changing with output time.

[0091] In an optional technical solution, the locking control actuator comprises a first locking control mechanism for obliquely locking the outer gear of the flywheel of the engine, and the locking angle between the first locking control mechanism and the outer gear of the flywheel is greater than 90°. The control device further comprises:

[0092] The fourth determination module is configured to determine whether the unlocking action is performed on the engine.

[0093] The fourth control module is configured to control the generator to stop outputting the locking torque to the locking control actuator and control the locking control actuator to perform the unlocking action when the unlocking action is performed on the engine.

[0094] Based on the same technical concept as the control method, the technical solution of the present application further provides an electronic device comprising a processor and a memory, the memory being coupled to the processor, the memory storing instructions, and the instructions causing the electronic device to perform the steps of any one of the control methods when executed by the processor.

[0095] Based on the same technical concept as the control method, the technical solution of the present application further provides a computer readable storage medium having a computer program stored thereon, the program being executed by a processor to implement the steps of any one of the control methods.

[0096] The technical solution provided in the technical solution of the present application has at least the following technical effects or advantages:

[0097] By determining whether to perform a lock control action on the engine of the hybrid vehicle when the hybrid vehicle performs the driving mode switching, outputting a preset torque on the engine by the generator of the hybrid vehicle when it is determined that the lock control action needs to be performed, and controlling the preset lock control execution mechanism to perform the lock control action, the generator cooperates with the lock control execution mechanism to complete the lock control action, so that the method strategy can control the lock control action to be more smooth, reduce the collision loss of mechanical parts during the execution of the lock control action, and further improve the reliability of the hybrid vehicle during the driving mode switching.

[0098] Those skilled in the art will appreciate that the technical solutions of the present application can be provided as a method, a system, or a computer program product. Therefore, the present application can adopt a completely hardware technical solution, a completely software technical solution, or a technical solution combining software and hardware aspects. Moreover, the present application can adopt a computer program product in the form of being implemented on one or more computer usable storage media (including but not limited to disk memory, CD-ROM, optical memory, etc.) containing computer usable program codes.

[0099] The present application is described with reference to flowcharts and / or block diagrams of the method, device (module, system), and computer program product according to the technical solutions of the present application. It should be understood that each flow and / or block in the flowcharts and / or block diagrams, and the combination of the flows and / or blocks in the flowcharts and / or block diagrams can be implemented by computer program instructions. These computer program instructions can be provided to the processor of a general-purpose computer, a special-purpose computer, an embedded computer, or other programmable data processing devices to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing devices produce a device for implementing the functions specified in one or more flows in the flowcharts and / or one or more blocks in the block diagrams.

[0100] These computer program instructions can also be stored in a computer readable memory capable of guiding the computer or other programmable data processing devices to work in a specific way, so that the instructions stored in the computer readable memory produce a product including instruction devices, which implement the functions specified in one or more flows in the flowcharts and / or one or more blocks in the block diagrams.

[0101] These computer program instructions can also be loaded into a computer or other programmable data processing device, so that a series of operation steps are performed on the computer or other programmable device to produce a computer implemented process, so that the instructions executed on the computer or other programmable device provide steps for implementing the functions specified in one or more flows in the flowcharts and / or one or more blocks in the block diagrams.

[0102] Although the preferred embodiments of the application have been described herein, the skilled person will understand that changes and modifications can be suggested by the present disclosure, and it is intended to encompass such changes and modifications as fall within the scope of the application.

[0103] Obviously, numerous modifications and variations of the present application are possible in light of the above teachings. It is therefore to be understood that within the scope of the appended claims and their equivalents, the application can be practiced otherwise than as specifically described.

Claims

1. A method for switching drive modes in a hybrid vehicle, characterized in that, The method includes: When a hybrid vehicle performs a drive mode switch, it is determined whether to perform a locking action on the engine of the hybrid vehicle. The locking action includes a locking action to stop the engine from rotating and an unlocking action to start the engine. If so, the generator of the hybrid vehicle is driven to output a preset torque to the engine, and the preset locking actuator is controlled to perform the locking action; so that the generator cooperates with the locking actuator to complete the locking action, thereby realizing the switching of the driving mode.

2. The hybrid vehicle drive mode switching control method according to claim 1, characterized in that, The locking actuator includes a first locking mechanism that obliquely locks the external teeth of the engine's flywheel, and the locking angle between the first locking mechanism and the external teeth of the flywheel is less than 90°; the generator driving the hybrid vehicle outputs a preset torque to the engine and controls the preset locking actuator to perform the locking action, including: When the locking action is the locking action, the first locking mechanism is controlled to perform the locking action, so that the first support rod of the first locking mechanism is in close contact with the external teeth of the flywheel. The generator is controlled to rotate the flywheel of the engine in the locking direction corresponding to the locking action according to the preset torque. When the rotation state of the flywheel meets a first preset condition, the generator is controlled to stop rotating, wherein the first preset condition includes at least the same detection result of the flywheel in adjacent position detection cycles; When the locking action is the unlocking action, the generator is controlled to pull the flywheel to rotate in the unlocking direction corresponding to the unlocking action according to the preset torque; When the rotation state of the flywheel meets the second preset condition, the first locking mechanism is controlled to perform the unlocking action, wherein the second preset condition includes at least the rotation distance of the flywheel along the unlocking direction being greater than the first preset value.

3. The hybrid vehicle drive mode switching control method according to claim 2, characterized in that, The locking actuator further includes a second locking mechanism for obliquely locking the external teeth of the flywheel, the second locking mechanism being mirror-image of the first locking mechanism along the radial direction of the flywheel; after controlling the generator to stop rotating when the rotation state of the flywheel meets a first preset condition, the method further includes: Control the second locking mechanism to perform the locking action, so that the second support rod of the second locking mechanism is in close contact with the external teeth of the flywheel; The generator is controlled to pull the flywheel to rotate in the unlocking direction corresponding to the unlocking action; When the rotation state of the flywheel meets the first preset condition, the generator is controlled to stop rotating.

4. The hybrid vehicle drive mode switching control method according to claim 2, characterized in that, The locking actuator further includes a second locking mechanism for obliquely locking the external teeth of the flywheel, the second locking mechanism being arranged as a radial mirror image of the first locking mechanism along the flywheel; after controlling the first locking mechanism to perform the unlocking action, the method further includes: The second locking mechanism is controlled to perform the unlocking action, so that the second support rod of the second locking mechanism is reset and retracted when the engine starts running.

5. The hybrid vehicle drive mode switching control method according to claim 1, characterized in that, After the generator, in conjunction with the locking actuator, performs the locking action, the method further includes: Determine whether the generator is in the working state of outputting torque at the wheel end under the current drive mode; If not, the generator is controlled to output locking torque to the locking actuator, so that the flywheel of the engine and the strut of the locking actuator are in close contact during the operation of the hybrid vehicle.

6. The hybrid vehicle drive mode switching control method according to claim 5, characterized in that, After controlling the generator to output locking torque to the locking actuator, the method further includes: Determine whether the generator has switched to the operating state; If so, the generator output torque to the wheel end is controlled according to the locking torque and the preset torque output curve, wherein the torque output curve is the curve of the generator output torque changing with output time.

7. The hybrid vehicle drive mode switching control method according to claim 5, characterized in that, The locking actuator includes a first locking mechanism for obliquely locking the external teeth of the engine flywheel, and the locking angle between the first locking mechanism and the external teeth of the flywheel is greater than 90°; after controlling the generator to output locking torque to the locking actuator, the method further includes: Determine whether to perform the unlocking action on the engine; If so, the generator is controlled to stop outputting the locking torque to the locking actuator, and the locking actuator is controlled to perform the unlocking action.

8. A hybrid vehicle drive mode switching control device, characterized in that, The device includes: The first determining module is used to determine whether to perform a locking action on the engine of the hybrid vehicle when the hybrid vehicle performs a drive mode switch, wherein the locking action includes a locking action to control the engine to stop rotating and an unlocking action to control the engine to start running. The first control module is used to drive the generator of the hybrid vehicle to output a preset torque to the engine when the engine is locked, and to control a preset locking actuator to perform the locking action; so that the generator cooperates with the locking actuator to complete the locking action, thereby realizing the switching of the driving mode.

9. An electronic device, characterized in that, The device includes a processor and a memory, the memory being coupled to the processor, the memory storing instructions that, when executed by the processor, cause the electronic device to perform the steps of the method according to any one of claims 1-7.

10. A computer-readable storage medium having a computer program stored thereon, characterized in that, When executed by a processor, the program implements the steps of the method described in any one of claims 1-7.

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