Series-parallel connection switching method, device and equipment for hybrid vehicle and storage medium

Abstract

A series-parallel switching method, device and equipment for a hybrid vehicle and a storage medium relate to the technical field of vehicle control, and comprise: when the hybrid vehicle is switched from a series driving mode to a parallel driving mode, according to the obtained rotating speed of the engine end and the rotating speed of the wheel end of a switchable roller one-way clutch, controlling the switchable roller one-way clutch to switch the series driving mode to the parallel driving mode; the switchable roller one-way clutch is controlled to be closed; when the hybrid vehicle is switched from the series drive mode to the parallel drive mode, the switchable roller one-way clutch is controlled to be disconnected according to the obtained rotating speed difference between the engine end and the wheel end of the switchable roller one-way clutch, and the problems that in the related technology, a hydraulic clutch is high in price and cost, and the service life of the hydraulic clutch is influenced are solved. The technical problems that in the prior art, the control process of series-parallel connection switching of the hybrid vehicle needs to be strictly carried out according to steps, and control is not flexible enough are solved, the switching control process of the series-parallel connection driving modes of the vehicle can be simpler, more convenient and more flexible, and the cost is lower.

Description

Technical Field

[0001] The present application relates to the field of vehicle control technology, and in particular to a method and device for series-parallel switching of a hybrid vehicle. Background Art

[0002] In recent years, in order to achieve low carbonization of energy-saving vehicles, traditional fuel vehicles are gradually developing into oil-electric hybrid models, among which series-parallel hybrid models are widely adopted because they take into account the advantages of both series hybrid and parallel hybrid vehicles. In the related technology, most of the clutches used for series-parallel hybrid control are hydraulic clutches, which are inherited from traditional clutches. The clutch closing torque transmission and the disengagement of the master and slave discs are realized through the hydraulic structure, and two-way torque transmission can be realized. The engagement and disengagement process of the master and slave discs of the hydraulic clutch must follow a strict timing control process. For example, during the clutch engagement process, the speed difference between the master and slave discs must be within the threshold range before the clutch can be requested to be pressed and closed, so as to avoid excessive speed difference causing wear, heating and even failure of the master and slave discs. The clutch disengagement process is similar. The clutch torque needs to be unloaded to zero before the clutch can be requested to open, otherwise the speed of the engine end will rise very quickly. However, the cost price of the hydraulic clutch is relatively high, and the control process must be carried out strictly according to the steps, which is not flexible enough in control. Summary of the invention

[0003] The present application provides a method, device, equipment and storage medium for series-parallel switching of a hybrid vehicle, which can solve the technical problems existing in the prior art that the price cost of using a hydraulic clutch is high, the control process of series-parallel switching of a hybrid vehicle must be strictly carried out according to steps, and the control is not flexible and simple enough.

[0004] In a first aspect, an embodiment of the present application provides a method for series-parallel switching of a hybrid vehicle, the method for series-parallel switching of a hybrid vehicle comprising:

[0005] Determining a current driving mode of the hybrid vehicle, wherein the driving mode includes a series driving mode and a parallel driving mode;

[0006] If the driving mode is the series driving mode, the switchable roller one-way clutch is controlled to close according to the obtained engine end speed and wheel end speed of the switchable roller one-way clutch, so as to complete the switching of the hybrid vehicle from the series driving mode to the parallel driving mode;

[0007] If the driving mode is the parallel driving mode, the switchable roller one-way clutch is controlled to be disconnected according to the obtained speed difference between the engine end and the wheel end of the switchable roller one-way clutch, so as to complete the switching of the hybrid vehicle from the parallel driving mode to the series driving mode.

[0008] In combination with the first aspect, in one implementation, controlling the switchable roller one-way clutch to close according to the acquired engine end speed and wheel end speed of the switchable roller one-way clutch comprises:

[0009] Determining a first target speed of the engine end according to the acquired speed of the wheel end;

[0010] Determining a magnitude relationship between the acquired rotation speed of the engine end and the first target rotation speed;

[0011] If it is determined that the rotation speed of the engine end is less than the first target rotation speed, the electromagnetic relay on the switchable roller one-way clutch is immediately energized and closed to drive the switchable roller one-way clutch to close.

[0012] In combination with the first aspect, in an implementation manner, after determining the magnitude relationship between the acquired rotation speed of the engine end and the first target rotation speed, the method further includes:

[0013] If the speed of the engine end is greater than or equal to the first target speed, the speed of the engine end is reduced to below the first target speed;

[0014] If it is determined that the rotation speed of the engine end is less than the first target rotation speed, the electromagnetic relay on the switchable roller one-way clutch is immediately energized and closed to drive the switchable roller one-way clutch to close.

[0015] In combination with the first aspect, in one implementation, controlling the switchable roller one-way clutch to be disconnected according to the acquired speed difference between the engine end and the wheel end of the switchable roller one-way clutch comprises:

[0016] Determine the speed target value of the engine end according to the obtained wheel end speed difference and the preset standard speed difference;

[0017] regulating the speed of the engine end according to the speed regulation target value of the engine end;

[0018] When it is detected that the speed of the engine end drops to the speed regulation target value, obtaining the speed difference between the engine end and the wheel end;

[0019] The acquired speed difference is compared with the preset standard speed difference, and when the speed difference is greater than the preset standard speed difference, the switchable roller one-way clutch is controlled to automatically disconnect.

[0020] In combination with the first aspect, in one embodiment, before controlling the switchable roller one-way clutch to automatically disconnect, the method further includes:

[0021] determining whether the switchable roller one-way clutch is currently in a disconnected state;

[0022] When it is determined that the switchable roller one-way clutch is not disconnected, the electromagnetic relay is powered off to eliminate the magnetic attraction between the electromagnetic relays.

[0023] In combination with the first aspect, in one implementation, determining the first target speed of the engine end according to the acquired actual speed of the wheel end includes:

[0024] Acquiring an actual rotation speed of the wheel end and a first preset threshold value;

[0025] A first target speed of the engine end is determined according to a first preset formula, the actual speed of the wheel end and the first preset threshold.

[0026] In combination with the first aspect, in one implementation, determining the speed control target value of the engine end according to the acquired speed difference of the wheel end and the preset standard speed includes:

[0027] Acquire the rotation speed of the wheel end, the preset standard rotation speed difference and the second preset threshold value;

[0028] The speed regulation target value of the engine end is determined according to the second preset formula, the rotation speed of the wheel end, the preset standard rotation speed difference and the second preset threshold value.

[0029] In a second aspect, an embodiment of the present application provides a hybrid vehicle series-parallel switching device, the hybrid vehicle series-parallel switching device comprising:

[0030] A determination module, configured to determine a current driving mode of the hybrid vehicle, wherein the driving mode includes a series driving mode and a parallel driving mode;

[0031] a first switching module, configured to control the switchable roller one-way clutch to close according to the acquired engine end speed and wheel end speed of the switchable roller one-way clutch if it is determined that the parallel drive mode needs to be switched to the series drive mode, so as to complete the switching of the hybrid vehicle from the series drive mode to the parallel drive mode;

[0032] The second switching module is used to control the switchable roller one-way clutch to disconnect according to the obtained speed difference between the engine end and the wheel end of the switchable roller one-way clutch if it is determined that the parallel drive mode needs to be switched to the series drive mode, so as to complete the switching of the hybrid vehicle from the parallel drive mode to the series drive mode.

[0033] In a third aspect, an embodiment of the present application provides a device for series-parallel switching of a hybrid vehicle, characterized in that the device for series-parallel switching of a hybrid vehicle comprises a processor, a memory, and a program for series-parallel switching of a hybrid vehicle stored in the memory and executable by the processor, wherein when the program for series-parallel switching of a hybrid vehicle is executed by the processor, the steps of the method for series-parallel switching of a hybrid vehicle as described in any one of the above items are implemented.

[0034] In a fourth aspect, an embodiment of the present application provides a computer-readable storage medium, on which a program for series-parallel switching of a hybrid vehicle is stored. When the program for series-parallel switching of a hybrid vehicle is executed by a processor, the steps of the method for series-parallel switching of a hybrid vehicle as described in any one of the above items are implemented.

[0035] The beneficial effects brought by the technical solution provided by the embodiment of the present application include at least:

[0036] By determining the current driving mode of the hybrid vehicle, wherein the driving mode includes a series driving mode and a parallel driving mode; if the driving mode is the series driving mode, then according to the obtained rotational speed of the engine end and the rotational speed of the wheel end of the switchable roller one-way clutch, the switchable roller one-way clutch is controlled to be closed, so as to complete the switching of the hybrid vehicle from the series driving mode to the parallel driving mode; if the driving mode is the parallel driving mode, then according to the obtained rotational speed difference between the engine end and the wheel end of the switchable roller one-way clutch, the switchable roller one-way clutch is controlled to be disconnected, so as to complete the switching of the hybrid vehicle from the parallel driving mode to the series driving mode, thereby solving the technical problems that the price cost of the hydraulic clutch used in the related art is high, the control process of the series-parallel switching of the hybrid vehicle must be strictly carried out according to the steps, and the control is not flexible enough. The present invention can make the control process of the series-parallel switching lower in cost, simpler and more flexible. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 A schematic flow chart of an embodiment of a method for series-parallel switching of a hybrid vehicle of the present application;

[0038] Figure 2 For this application Figure 1 Detailed flow chart of step S20;

[0039] Figure 3 For this application Figure 1 Detailed flow chart of step S30;

[0040] Figure 4 A schematic diagram of functional modules of an embodiment of a device for series-parallel switching of a hybrid vehicle of the present application;

[0041] Figure 5This is a schematic diagram of the hardware structure of the hybrid vehicle series-parallel switching device involved in the embodiment of the present application. DETAILED DESCRIPTION

[0042] In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0043] The terms "including" and "having" and any variations thereof in the specification and claims of this application and the above-mentioned drawings are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device that includes a series of steps or units is not limited to the listed steps or units, but optionally includes steps or units that are not listed, or optionally includes other steps or units inherent to these processes, methods, products or devices. The terms "first", "second" and "third" are used to distinguish different objects, etc., and do not represent a sequence, nor do they limit "first", "second" and "third" to different types.

[0044] In the description of the embodiments of the present application, "exemplary", "for example" or "for example" are used to indicate examples, illustrations or descriptions. Any embodiment or design described as "exemplary", "for example" or "for example" in the embodiments of the present application should not be interpreted as being more preferred or more advantageous than other embodiments or designs. Specifically, the use of words such as "exemplary", "for example" or "for example" is intended to present related concepts in a specific way.

[0045] In the description of the embodiments of the present application, unless otherwise specified, “ / ” means or, for example, A / B can mean A or B; the “and / or” in the text is merely a description of the association relationship of associated objects, indicating that three relationships may exist, for example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone. In addition, in the description of the embodiments of the present application, “multiple” refers to two or more than two.

[0046] In some processes described in the embodiments of the present application, multiple operations or steps that appear in a specific order are included, but it should be understood that these operations or steps may not be executed in the order in which they appear in the embodiments of the present application or in parallel, and the sequence number of the operation is only used to distinguish the different operations, and the sequence number itself does not represent any execution order. In addition, these processes may include more or fewer operations, and these operations or steps may be executed in sequence or in parallel, and these operations or steps may be combined.

[0047] First, some technical terms in the present application are explained to facilitate those skilled in the art to understand the present application.

[0048] In order to make the objectives, technical solutions and advantages of the present application clearer, the implementation methods of the present application will be further described in detail below in conjunction with the accompanying drawings.

[0049] In a first aspect, an embodiment of the present application provides a method for series-parallel switching of a hybrid vehicle.

[0050] In one embodiment, referring to Figure 1 , Figure 1 This is a flow chart of the first embodiment of the method for series-parallel switching of a hybrid vehicle of the present application. Figure 1 As shown, the method for series-parallel switching of a hybrid vehicle includes:

[0051] Step S10: determining a current driving mode of the hybrid vehicle, wherein the driving mode includes a series driving mode and a parallel driving mode;

[0052] Exemplarily, when it is detected that the switchable roller one-way clutch is in the disconnected state, the engine end and the wheel end of the switchable roller one-way clutch are disconnected, and it is determined that the current hybrid vehicle is in the series drive mode. When the hybrid vehicle is in the series drive mode, the engine end and the wheel end are disconnected, and the engine cannot directly transmit torque to the wheel through the clutch to make the wheel rotate. At this time, the power source of the wheel is the motor, and the motor directly transmits torque to the wheel to make the wheel rotate. That is to say, when the vehicle is in the series drive mode, the power of the vehicle comes from the kinetic energy of the motor, not the kinetic energy of the engine.

[0053] When it is detected that the engine end and the wheel end of the switchable roller one-way clutch are closed, it is determined that the current hybrid vehicle is in parallel drive mode. When the hybrid vehicle is in parallel drive mode, the engine end and the wheel end are closed, the engine can directly transmit torque to the wheel through the clutch to make the wheel rotate, and the motor also transmits torque to the wheel to make the wheel rotate, that is, when the vehicle is in parallel drive mode, the power of the vehicle comes from the kinetic energy of the motor and the kinetic energy of the engine at the same time.

[0054] The working principle of the switchable roller one-way clutch is as follows: when the hybrid vehicle switches from the series drive mode to the parallel drive mode, the electromagnetic relay on the switchable roller one-way clutch is powered on and closed, and the roller in the clutch is pressed into the wide-area track. As the speed of the engine end increases, when it is increased to a speed greater than that of the wheel end, the roller is pushed to the narrow-area track, and then the roller is tightly clamped by the narrow-area track, thereby transmitting the torque of the engine end to the wheel end. When the hybrid vehicle switches from the parallel drive mode to the series drive mode, the electromagnetic relay on the switchable roller one-way clutch is de-energized. At this time, the clutch cannot be immediately bounced off by the spring sheet on the clutch because the roller is still stuck in the narrow-area track. When the speed of the engine end slowly decreases and drops below the preset threshold of the wheel end speed, the roller rolls to the wide-area track and will not be stuck by the track. In addition, at this time, due to the de-energization of the electromagnetic relay, the clutch loses its magnetic attraction, and the two ends of the clutch will be immediately bounced off by the spring sheet on it.

[0055] Step S20: if it is determined that the series drive mode needs to be switched to the parallel drive mode, the switchable roller one-way clutch is controlled to be closed according to the obtained engine end speed and wheel end speed of the switchable roller one-way clutch, so as to complete the switching of the hybrid vehicle from the series drive mode to the parallel drive mode;

[0056] Exemplarily, when it is detected that the vehicle needs to switch from series drive mode to parallel drive mode, and the speed of the engine end of the clutch is lower than the speed of the wheel end, the electromagnetic relay is directly controlled to energize and close it, and the roller in the clutch is pressed into the wide-area track. At this time, the switch from series mode to parallel mode is completed.

[0057] After the switch from series mode to parallel mode is completed, the engine speed is controlled to increase slowly. When the engine speed is detected to be higher than the wheel speed, the roller is pushed into the narrow track and is tightly stuck, and the torque of the engine is transmitted to the wheel through the roller. When the engine speed is detected to be higher than the wheel speed, the GCU and the engine are controlled to reduce the engine speed together until it drops below the wheel speed, and the electromagnetic relay is energized to close it, and then the control process after the above closing is carried out.

[0058] Step S30: If it is determined that the parallel drive mode needs to be switched to the series drive mode, the switchable roller one-way clutch is controlled to be disconnected according to the obtained speed difference between the engine end and the wheel end of the switchable roller one-way clutch to complete the switching of the hybrid vehicle from the parallel drive mode to the series drive mode.

[0059] For example, when it is detected that the vehicle is in parallel drive mode and needs to be switched to series drive mode, the electromagnetic relay is controlled to be de-energized to eliminate the magnetic attraction between the two ends of the clutch, and the torque transmitted from the engine end to the wheel end is eliminated, and then the speed of the engine end is reduced to generate a speed difference between the two ends of the clutch. When it is determined that a speed difference occurs between the two ends of the clutch, the roller will roll from the narrow track to the wide track, and the roller will no longer be tightly stuck by the narrow track. The two ends of the clutch will be automatically bounced open by the spring sheets therein, thereby completing the disconnection of the clutch, that is, completing the switch from the parallel drive mode to the series drive mode.

[0060] In this embodiment, by determining the current driving mode of the hybrid vehicle, wherein the driving mode includes a series driving mode and a parallel driving mode; if the driving mode is the series driving mode, then according to the obtained rotational speed of the engine end and the rotational speed of the wheel end of the switchable roller one-way clutch, the switchable roller one-way clutch is controlled to be closed, so as to complete the switching of the hybrid vehicle from the series driving mode to the parallel driving mode; if the driving mode is the parallel driving mode, then according to the obtained rotational speed difference between the engine end and the wheel end of the switchable roller one-way clutch, the switchable roller one-way clutch is controlled to be disconnected, so as to complete the switching of the hybrid vehicle from the parallel driving mode to the series driving mode, thereby solving the technical problems that the price cost of the hydraulic clutch used in the related art is high, the control process of the series-parallel switching of the hybrid vehicle must be strictly carried out according to the steps, and the control is not flexible enough. This embodiment can make the control process of the series-parallel switching of the hybrid vehicle lower in cost, simpler and more flexible.

[0061] Further, in one embodiment, referring to Figure 2 , Figure 2 For this application Figure 1 Detailed flow chart of step S20 in FIG. Figure 2 As shown, the control of closing the switchable roller one-way clutch according to the acquired engine end speed and wheel end speed of the switchable roller one-way clutch comprises:

[0062] Step S21: determining a first target speed of the engine end according to the actual speed of the wheel end obtained;

[0063] Exemplarily, the engine speed is obtained, and the obtained engine speed minus the preset threshold is used as the first target engine speed. The first target speed needs to be lower than the preset threshold of the actual speed of the wheel end, so that the engine speed and the wheel end speed form a deviation. This deviation is not only a hardware characteristic requirement for clutch engagement, but also a smoothness control from the series drive mode to the parallel drive mode through this deviation space.

[0064] Specifically, determining the first target speed of the engine end according to the acquired actual speed of the wheel end includes: subtracting a first preset threshold from the actual speed of the wheel end as the first target speed.

[0065] For example, if the actual speed of the wheel end is 3000rpm, the first target speed of the engine end can be set to 2900rpm. At this time, the speed deviation between the engine end and the wheel end is 100rpm, and the speed difference between the two ends of the clutch is 100rpm. The electromagnetic relay is energized to close it, and the roller in the clutch is pressed into the wide-area track. Then, the speed difference is reduced to zero at a preset speed, so that the roller rolls toward the narrow-area track at a steady speed, so that the roller and the track do not generate a large collision force, thereby damaging the clutch.

[0066] Step S22: determining the magnitude relationship between the acquired rotation speed of the engine end and the first target rotation speed;

[0067] For example, the obtained engine end speed is 2500 rpm, and the first target speed is 2600 rpm. At this time, the engine end speed is less than the first target speed. For another example, the obtained engine end speed is 2700 rpm, and the first target speed is 2800 rpm. At this time, the generator end speed is higher than the first target speed.

[0068] Step S23: If it is determined that the rotation speed of the engine end is less than the first target rotation speed, the electromagnetic relay on the switchable roller one-way clutch is immediately energized and closed to drive the switchable roller one-way clutch to close.

[0069] Exemplarily, when it is detected that the speed at the engine end is less than the first target speed, that is, the speed at the engine end is less than the actual speed preset threshold at the wheel end, the electromagnetic relay on the clutch is energized to close it, and the roller in the clutch will be pressed into the wide-area track in the clutch, completing the switch from the series drive mode to the parallel drive mode.

[0070] Step S24: If the speed of the engine end is greater than or equal to the first target speed, the speed of the engine end is reduced to below the first target speed; if it is determined that the speed of the engine end is less than the first target speed, the electromagnetic relay on the switchable roller one-way clutch is immediately energized and closed to drive the switchable roller one-way clutch to close.

[0071] Exemplarily, the engine torque is controlled to be reduced to the second target torque requirement. The second target torque requirement can be based on the first target speed combined with the engine's universal characteristic curve to find a torque that makes the fuel efficiency the highest as the second target torque requirement of the engine, so as to reduce the engine speed to below the target speed. At the same time, the GCU is controlled to output a torque to the engine, which can control the engine speed to be reduced to below the first target speed more quickly and stably.

[0072] According to the first target speed and the preset engine universal characteristic curve, the second target required torque of the engine is obtained. For example, if the first target speed is 2900rpm, this value is found on the horizontal axis of the engine universal characteristic curve, and then the contour with the largest value in the fuel efficiency contour is found, such as the contour with the largest value of 45% fuel efficiency, and the intersection of the vertical line where 2900rpm is located and the contour with the highest fuel efficiency is found. An intersection matching the power or load of the vehicle is selected as the target intersection among multiple intersections, and then the torque corresponding to the target intersection is found on the vertical axis as the second target required torque of the engine, and then the torque output to the wheel by the engine is controlled to be reduced to the target required torque at the preset speed. The control GCU will adjust the speed to the second target speed, and the first target speed minus the preset threshold is used as the second target speed of the GCU, which can prevent the engine speed from exceeding the first target speed when the speed fluctuates; when it is detected that the speed of the GCU reaches the second target speed and the torque of the engine reaches the second target required torque, the speed of the engine end will be controlled to be lowered to below the first target speed.

[0073] When it is determined that the clutch is in a fully closed state, the speed of the GCU is controlled to be maintained at the second target speed for the first preset time, that is, the speed difference between the two ends of the clutch is controlled to be maintained within the preset speed difference range for the first preset time, and then the torque transmitted to the engine by the GCU is controlled to be reduced. At this time, the negative torque received by the engine will slowly decrease, and its speed will slowly increase until it is consistent with the speed of the wheel end. In this process, the rollers in the clutch slowly roll from the wide-area track to the narrow-area track and fit closely with the track. Then the engine end starts to transmit torque to the wheel end, that is, the engine starts to drive the wheels to rotate, and then the torque transmitted to the engine by the GCU is controlled to be reduced to zero at a very fast speed.

[0074] In this embodiment, the first target speed of the engine end is determined according to the actual speed of the wheel end obtained; the relationship between the speed of the engine end obtained and the first target speed is determined; if it is determined that the speed of the engine end is less than the first target speed, the electromagnetic relay on the switchable roller one-way clutch is immediately energized and closed to drive the switchable roller one-way clutch to close, thereby solving the technical problem that the control process of switching from the series drive mode to the parallel drive mode in the related art is not flexible enough and has high cost. This embodiment can make the control process of switching from the series drive mode to the parallel drive mode simpler, more flexible and more economical.

[0075] Further, in one embodiment, referring to Figure 3 , Figure 3 For this application Figure 1 Detailed flow chart of step S30 in FIG. Figure 3 As shown, the control of disconnecting the switchable roller one-way clutch according to the acquired speed difference between the engine end and the wheel end of the switchable roller one-way clutch comprises:

[0076] Step S31: determining the speed control target value of the engine end according to the acquired speed of the wheel end and the preset standard speed difference;

[0077] Exemplarily, the speed at the wheel end is subtracted from a preset standard speed difference, and then subtracted from a second preset threshold value as the speed control target value at the engine end.

[0078] Specifically, determining the first target speed of the engine end based on the actual speed of the wheel end includes: obtaining the actual speed of the wheel end and a first preset threshold; determining the first target speed of the engine end based on a first preset formula, the actual speed of the wheel end and the first preset threshold.

[0079] For example, if the acquired rotation speed of the wheel end is 3000 rpm, the preset standard rotation speed difference is 50 rpm, and the first preset threshold value is 10 rpm, then the speed control target value of the engine end is 3000 rpm-50 rpm-10 rpm=2940 rpm.

[0080] Step S32: regulating the speed of the engine end according to the speed regulation target value of the engine end;

[0081] Demonstratively, the engine speed is controlled to drop to the speed target value. For example, if the speed target value obtained is 2940rpm, the engine speed is controlled to be adjusted to 2940rpm. The specific process is: find the speed target value 2940rpm on the horizontal axis of the engine universal characteristic curve, and then find the contour line with the largest value in the fuel efficiency contour line, such as 45% fuel efficiency is the contour line with the largest value. Find the intersection of the vertical line where 2900rpm is located and the contour line with the highest fuel efficiency, and select an intersection that matches the power or load of the vehicle from multiple intersections as the target intersection, and then find the torque corresponding to the target intersection on the vertical axis as 100N·m, as the first target required torque of the engine. After determining that the first target required torque is 100N·m, the torque output by the engine to the wheels will be reduced to 100N·m at a preset speed. The feedforward demand torque of GCU is obtained according to the actual torque of the engine. For example, if the actual torque of the engine is 180N·m, it is necessary to control GCU to output a torque of -80N·m to the engine to control the engine torque of 180N·m to 100N·m, and -80N·m is the feedforward demand torque of GCU. When the torque of GCU is controlled to reach the feedforward demand torque of -80N·m, the engine speed target value of 2900rpm is used as the third speed target value of GCU at this time. The target torque of GCU is obtained according to the third target speed of GCU. VCU obtains the speed difference between the actual speed of GCU and the third speed target value of GCU in real time, and the PID controller calculates the target torque of GCU according to the speed difference. When the torque of the engine is controlled to drop to the target demand torque, and the torque of GCU reaches the sum of the feedforward demand torque and the target torque, the speed of the engine will reach the speed target value.

[0082] Step S33: when it is detected that the speed of the engine end drops to the speed regulation target value, obtaining the speed difference between the engine end and the wheel end;

[0083] Exemplarily, when the speed of the detected engine end drops to a target value, the speed difference between the engine end and the wheel end may fluctuate in real time, and the speed difference between the engine end and the wheel end needs to be acquired in real time.

[0084] Step S34: comparing the acquired speed difference with the preset standard speed difference, and when the speed difference is greater than the preset standard speed difference, controlling the switchable roller one-way clutch to automatically disconnect.

[0085] Exemplarily, when it is detected that the speed difference is greater than the preset standard speed difference, the roller in the clutch is driven by the engine end to roll into the wide-area track, and the roller is no longer squeezed by the narrow-area track, so that it can be automatically bounced open by the spring sheet in the clutch, that is, the switchable roller one-way clutch is controlled to automatically disconnect.

[0086] Specifically, before controlling the switchable roller one-way clutch to automatically disconnect, it also includes: determining whether the switchable roller one-way clutch is currently in a disconnected state; when it is determined that the switchable roller one-way clutch is not disconnected, powering off the electromagnetic relay to eliminate the magnetic attraction between the electromagnetic relays.

[0087] Exemplarily, when it is determined to start controlling the switchable roller one-way clutch to automatically disconnect, it is necessary to control the electromagnetic relay to be de-energized in advance to eliminate the influence of the residual current of the electromagnetic relay, so that the magnetic attraction between the electromagnetic relays disappears before the clutch needs to be disconnected.

[0088] In the present embodiment, the speed control target value of the engine end is determined according to the obtained rotational speed of the wheel end and the preset standard rotational speed difference; the rotational speed of the engine end is controlled according to the speed control target value of the engine end; when it is detected that the rotational speed of the engine end drops to the speed control target value, the rotational speed difference between the engine end and the wheel end is obtained; the obtained rotational speed difference is compared with the preset standard rotational speed difference, and when the rotational speed difference is greater than the preset standard rotational speed difference, the switchable roller one-way clutch is controlled to automatically disconnect, thereby solving the technical problem that the control process of switching from the parallel drive mode to the series drive mode in the related art is not flexible enough and has high cost. The present embodiment can make the control process of switching from the parallel drive mode to the series drive mode simpler, more flexible and more economical.

[0089] In a second aspect, an embodiment of the present application also provides a device for series-parallel switching of a hybrid vehicle.

[0090] In one embodiment, referring to Figure 4 , Figure 4 This is a functional module diagram of an embodiment of a device for series-parallel switching of a hybrid vehicle of the present application. Figure 4 As shown, the device for series-parallel switching of a hybrid vehicle includes:

[0091] A determination module 01 is used to determine a current driving mode of the hybrid vehicle, wherein the driving mode includes a series driving mode and a parallel driving mode;

[0092] The first switching module 02 is used for controlling the switchable roller one-way clutch to close according to the acquired engine end speed and wheel end speed of the switchable roller one-way clutch if the driving mode is the series driving mode, so as to complete the switching of the hybrid vehicle from the series driving mode to the parallel driving mode;

[0093] The second switching module 03 is used to control the switchable roller one-way clutch to be disconnected according to the obtained speed difference between the engine end and the wheel end of the switchable roller one-way clutch if the driving mode is the parallel driving mode, so as to complete the switching of the hybrid vehicle from the parallel driving mode to the series driving mode.

[0094] Furthermore, in one embodiment, the first switching module 02 is further configured to:

[0095] Determining a first target speed at the engine end according to the acquired actual speed at the wheel end;

[0096] Determining a magnitude relationship between the acquired rotation speed of the engine end and the first target rotation speed;

[0097] If it is determined that the rotation speed of the engine end is less than the first target rotation speed, the electromagnetic relay on the switchable roller one-way clutch is immediately energized and closed to drive the switchable roller one-way clutch to close.

[0098] Furthermore, in one embodiment, the second switching module 02 is further used for:

[0099] Determine the speed target value of the engine end according to the obtained wheel end speed difference and the preset standard speed difference;

[0100] regulating the speed of the engine end according to the speed regulation target value of the engine end;

[0101] When it is detected that the speed of the engine end drops to the speed regulation target value, obtaining the speed difference between the engine end and the wheel end;

[0102] The acquired speed difference is compared with the preset standard speed difference, and when the speed difference is greater than the preset standard speed difference, the switchable roller one-way clutch is controlled to automatically disconnect.

[0103] Among them, the functional implementation of each module in the above-mentioned hybrid vehicle series-parallel switching device corresponds to the various steps in the above-mentioned hybrid vehicle series-parallel switching method embodiment, and its functions and implementation processes are no longer repeated here one by one.

[0104] In a third aspect, an embodiment of the present application provides a device for series-parallel switching of a hybrid vehicle. The device for series-parallel switching of a hybrid vehicle may be a personal computer (PC), a laptop computer, a server, or other device with data processing capabilities.

[0105] Reference Figure 5 , Figure 5Schematic diagram of the hardware structure of the hybrid vehicle series-parallel switching device involved in the embodiment of the present application. In the embodiment of the present application, the hybrid vehicle series-parallel switching device may include a processor, a memory, a communication interface and a communication bus.

[0106] The communication bus may be of any type and is used to interconnect the processor, the memory, and the communication interface.

[0107] The communication interface includes input / output (I / O) interfaces, physical interfaces, and logical interfaces, which are used to interconnect devices inside the equipment for realizing the series-parallel switching of hybrid vehicles, and interfaces for interconnecting the equipment for realizing the series-parallel switching of hybrid vehicles with other devices (such as other computing devices or user devices). The physical interface can be an Ethernet interface, a fiber optic interface, an ATM interface, etc.; the user device can be a display, a keyboard, etc.

[0108] The memory can be various types of storage media, such as random access memory (RAM), read-only memory (ROM), non-volatile RAM (NVRAM), flash memory, optical storage, hard disk, programmable ROM (PROM), erasable PROM (EPROM), electrically erasable PROM (EEPROM), etc.

[0109] The processor may be a general-purpose processor, and the general-purpose processor may call the hybrid vehicle series-parallel switching program stored in the memory, and execute the hybrid vehicle series-parallel switching method provided in the embodiment of the present application. For example, the general-purpose processor may be a central processing unit (CPU). The method executed when the hybrid vehicle series-parallel switching program is called may refer to the various embodiments of the hybrid vehicle series-parallel switching method of the present application, and will not be repeated here.

[0110] Those skilled in the art will understand that Figure 5 The hardware structure shown in the figure does not constitute a limitation on the present application, and may include more or less components than shown in the figure, or combine certain components, or arrange the components differently.

[0111] In a fourth aspect, an embodiment of the present application also provides a readable storage medium.

[0112] The readable storage medium of the present application stores a program for series-parallel switching of a hybrid vehicle, wherein when the program for series-parallel switching of a hybrid vehicle is executed by a processor, the steps of the method for series-parallel switching of a hybrid vehicle as described above are implemented.

[0113] Among them, the method implemented when the hybrid vehicle series-parallel switching program is executed can refer to the various embodiments of the hybrid vehicle series-parallel switching method of the present application, and will not be repeated here.

[0114] It should be noted that the serial numbers of the above-mentioned embodiments of the present application are only for description and do not represent the advantages or disadvantages of the embodiments.

[0115] Through the description of the above implementation methods, those skilled in the art can clearly understand that the above-mentioned embodiment methods can be implemented by means of software plus a necessary general hardware platform, and of course by hardware, but in many cases the former is a better implementation method. Based on such an understanding, the technical solution of the present application is essentially or the part that contributes to the prior art can be embodied in the form of a software product, which is stored in a storage medium (such as ROM / RAM, disk, CD) as described above, and includes a number of instructions for a terminal device to execute the methods described in each embodiment of the present application.

[0116] The above are only preferred embodiments of the present application, and are not intended to limit the patent scope of the present application. Any equivalent structure or equivalent process transformation made using the contents of the present application specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present application.

Claims

1. A method for series-parallel switching of a hybrid vehicle, characterized in that: The method for series-parallel switching of a hybrid vehicle comprises: Determining a current driving mode of the hybrid vehicle, wherein the driving mode includes a series driving mode and a parallel driving mode; If it is determined that the series drive mode needs to be switched to the parallel drive mode, the switchable roller one-way clutch is controlled to be closed according to the acquired engine end speed and wheel end speed of the switchable roller one-way clutch, so as to complete the switching of the hybrid vehicle from the series drive mode to the parallel drive mode; If it is determined that the parallel drive mode needs to be switched to the series drive mode, the switchable roller one-way clutch is controlled to be disconnected based on the obtained speed difference between the engine end and the wheel end of the switchable roller one-way clutch to complete the switching of the hybrid vehicle from the parallel drive mode to the series drive mode.

2. The method for series-parallel switching of a hybrid vehicle according to claim 1, characterized in that: The step of controlling the switchable roller one-way clutch to close according to the obtained engine end speed and wheel end speed of the switchable roller one-way clutch comprises: Determining a first target speed of the engine end according to the acquired speed of the wheel end; Determining a magnitude relationship between the acquired rotation speed of the engine end and the first target rotation speed; If it is determined that the rotation speed of the engine end is less than the first target rotation speed, the electromagnetic relay on the switchable roller one-way clutch is immediately energized and closed to drive the switchable roller one-way clutch to close.

3. The method for series-parallel switching of a hybrid vehicle as claimed in claim 2, characterized in that: After determining the magnitude relationship between the acquired rotation speed of the engine end and the first target rotation speed, the method further includes: If the speed of the engine end is greater than or equal to the first target speed, the speed of the engine end is reduced to below the first target speed; If it is determined that the rotation speed of the engine end is less than the first target rotation speed, the electromagnetic relay on the switchable roller one-way clutch is immediately energized and closed to drive the switchable roller one-way clutch to close.

4. The method for series-parallel switching of a hybrid vehicle as claimed in claim 1, characterized in that: The step of controlling the switchable roller one-way clutch to be disconnected according to the obtained speed difference between the engine end and the wheel end of the switchable roller one-way clutch comprises: Determining a speed control target value of the engine end according to the acquired speed difference of the wheel end and a preset standard speed; regulating the speed of the engine end according to the speed regulation target value of the engine end; When it is detected that the speed of the engine end drops to the speed regulation target value, obtaining the speed difference between the engine end and the wheel end; The acquired speed difference is compared with the preset standard speed difference, and when the speed difference is greater than the preset standard speed difference, the switchable roller one-way clutch is controlled to automatically disconnect.

5. The method for series-parallel switching of a hybrid vehicle as claimed in claim 4, characterized in that: Before controlling the switchable roller one-way clutch to automatically disconnect, the method further includes: determining whether the switchable roller one-way clutch is currently in a disconnected state; When it is determined that the switchable roller one-way clutch is not disconnected, the electromagnetic relay is powered off to eliminate the magnetic attraction between the electromagnetic relays.

6. The method for series-parallel switching of a hybrid vehicle as claimed in claim 2, characterized in that: Determining the first target speed of the engine end according to the acquired actual speed of the wheel end includes: Acquiring an actual rotation speed of the wheel end and a first preset threshold value; A first target speed of the engine end is determined according to a first preset formula, the actual speed of the wheel end and the first preset threshold.

7. The method for series-parallel switching of a hybrid vehicle as claimed in claim 4, characterized in that: Determining the speed control target value of the engine end according to the acquired speed of the wheel end and the preset standard speed difference includes: Acquire the rotation speed of the wheel end, the preset standard rotation speed difference and the second preset threshold value; The speed regulation target value of the engine end is determined according to the second preset formula, the rotation speed of the wheel end, the preset standard rotation speed difference and the second preset threshold value.

8. A device for series-parallel switching of a hybrid vehicle, characterized in that: The hybrid vehicle series-parallel switching device comprises: A determination module, configured to determine a current driving mode of the hybrid vehicle, wherein the driving mode includes a series driving mode and a parallel driving mode; a first switching module, configured to control the switchable roller one-way clutch to close according to the acquired engine end speed and wheel end speed of the switchable roller one-way clutch if it is determined that the series drive mode needs to be switched to the parallel drive mode, so as to complete the switching of the hybrid vehicle from the series drive mode to the parallel drive mode; The second switching module is used to control the switchable roller one-way clutch to be disconnected according to the obtained speed difference between the engine end and the wheel end of the switchable roller one-way clutch if it is determined that the parallel drive mode needs to be switched to the series drive mode, so as to complete the switching of the hybrid vehicle from the parallel drive mode to the series drive mode.

9. A device for series-parallel switching of hybrid vehicles, characterized in that: The hybrid vehicle series-parallel switching device includes a processor, a memory, and a hybrid vehicle series-parallel switching program stored in the memory and executable by the processor. When the hybrid vehicle series-parallel switching program is executed by the processor, the steps of the hybrid vehicle series-parallel switching method as described in any one of claims 1 to 7 are implemented.

10. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores a program for series-parallel switching of a hybrid vehicle, wherein when the program for series-parallel switching of a hybrid vehicle is executed by a processor, the steps of the method for series-parallel switching of a hybrid vehicle as described in any one of claims 1 to 7 are implemented.

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