A method, device, and vehicle for enhancing driving range

Abstract

Embodiments of the present application disclose a method, apparatus, and vehicle for enhancing the cruising range, including: obtaining the current driving mode of the vehicle; controlling the generator to enter a first preset mode of the generator according to the current driving mode; controlling the gear of the rear-wheel transmission to a first target gear according to the first preset mode and the power difference between the actual required power and the target power, and controlling the rear-wheel drive motor to enter a second preset mode of the rear-wheel drive motor. This solution controls the working state of the generator through the current driving mode of the vehicle, and controls the working state of the rear-wheel drive motor according to the power difference between the actual required power and the target power. When at least one of the engine and the rear-wheel drive motor enters the standby mode, it can save the energy loss generated by the zero-torque control method while ensuring the normal operation of the vehicle, thereby saving the unnecessary loss of electric energy of the power battery and increasing the cruising range of the vehicle.

Description

Technical Field

[0001] The present application relates to the technical field of vehicle control, and particularly to a method, a device, and a vehicle for enhancing the cruising range. Background Art

[0002] Currently, hybrid vehicles are increasingly favored by consumers and manufacturers due to advantages such as the selection of a low-displacement engine, low requirements for the power battery capacity, and low motor operating noise. Hybrid vehicles add power battery and drive motor components on the basis of traditional fuel vehicles, solving substantial problems such as low efficiency and high pollution during engine idling, large load, and full load, and can ensure that the engine operates in a high-efficiency and low-pollution area as much as possible to drive and charge the power battery, and then cooperate with the drive motor to achieve advantages such as a long pure electric cruising range and multiple available working modes.

[0003] Currently, there have been many studies on the cruising range of hybrid vehicles in the case of electric driving. However, without changing any hardware facilities and circuit structures, the problem of short cruising range still needs to be further solved. Summary of the Invention

[0004] The main purpose of the present application is to provide a method, a device, and a vehicle for enhancing the cruising range, aiming to solve the technical problem of short cruising range of existing hybrid vehicles.

[0005] To achieve the above object, the present application provides a method for enhancing the cruising range, including:

[0006] Obtain the current driving mode of the vehicle;

[0007] According to the current driving mode, control the generator to enter the first preset mode of the generator;

[0008] According to the first preset mode and the power difference between the actual required power and the target power, control the gear of the rear-wheel transmission to the first target gear and control the rear-wheel drive motor to enter the second preset mode of the rear-wheel drive motor.

[0009] Optionally, the method further includes:

[0010] Distribute the recovered torque according to the second preset mode.

[0011] Optionally, the second preset mode includes a standby mode and a working mode. Distributing the recovered torque according to the second preset mode includes:

[0012] When the second preset mode is the standby mode, distribute all the recovered torque to the front-wheel drive motor; or,

[0013] When the second preset mode is the working mode, based on the respective real-time torques of the front drive motor and the rear drive motor, determine the respective recovery ratios of the front drive motor and the rear drive motor, and distribute the recovery torque to the front drive motor and the rear drive motor simultaneously according to the recovery ratios.

[0014] Optionally, according to the current driving mode, controlling the generator to enter the first preset mode of the generator includes:

[0015] When the driving mode is the pure electric mode, controlling the generator to enter the standby mode of the generator; or,

[0016] When the driving mode is the hybrid mode, controlling the generator to enter the working mode of the generator.

[0017] Optionally, according to the first preset mode and the power difference between the actual required power and the target power, controlling the gear of the rear transmission to be the first target gear and controlling the rear drive motor to enter the second preset mode of the rear drive motor includes:

[0018] When the power difference indicates that the actual required power does not exceed the target power, controlling the gear of the rear transmission to be the first target gear and controlling the rear drive motor to enter the standby mode; or,

[0019] When the power difference indicates that the actual required power exceeds the target power, controlling the gear of the rear transmission to be the first target gear and controlling the rear drive motor to enter the working mode.

[0020] Optionally, the working mode includes a speed control mode and a torque control mode, where:

[0021] When controlling the rear drive motor to enter the working mode, controlling the rear drive motor to enter the speed control mode from the standby mode;

[0022] Controlling the speed of the rear drive motor to reach the target speed;

[0023] Controlling the gear of the rear transmission to be the second target gear;

[0024] Controlling the rear drive motor to enter the torque control mode from the speed control mode, and the rear drive motor continuously operates in the torque control mode.

[0025] Optionally, when the driving mode is the hybrid mode, controlling the generator to enter the working mode includes:

[0026] When the driving mode is the hybrid mode, control the generator to enter the torque control mode.

[0027] In addition, to achieve the above object, the present application further provides a device for enhancing the cruising range, including:

[0028] An acquisition module: configured to acquire the current driving mode of the vehicle;

[0029] A first control module: configured to control the generator to enter a first preset mode of the generator according to the current driving mode;

[0030] A second control module: configured to control the gear of the rear-wheel transmission to be a first target gear according to the first preset mode and the power difference between the actual required power and the target power, and control the rear-wheel drive motor to enter a second preset mode of the rear-wheel drive motor.

[0031] In addition, to achieve the above object, the present application further provides a vehicle, the vehicle includes: a vehicle control unit;

[0032] The vehicle control unit is used for the method for enhancing the cruising range described in the above embodiments.

[0033] Beneficial effects that the present application can achieve:

[0034] A method for enhancing the cruising range proposed in an embodiment of the present application includes: acquiring the current driving mode of the vehicle; controlling the generator to enter a first preset mode of the generator according to the current driving mode; according to the first preset mode and the power difference between the actual required power and the target power, controlling the gear of the rear-wheel transmission to be a first target gear, and controlling the rear-wheel drive motor to enter a second preset mode of the rear-wheel drive motor.

[0035] In the prior art, power consumption is generated due to the need to ensure the zero-torque control mode of the motor. In this solution, the working state of the generator is controlled by the current driving mode of the vehicle, and the working state of the rear-wheel drive motor is controlled according to the power difference between the actual required power and the target power. When at least one of the engine and the rear-wheel drive motor enters the standby mode, energy loss generated by the zero-torque control mode can be saved while ensuring the normal operation of the vehicle, thereby saving the electric energy unnecessarily consumed by the power battery and increasing the cruising range of the vehicle; further, there are no other changes in the hardware settings and circuit structure in this solution, but the above object is achieved based on the change of the control logic, and there is no increase in other costs. The vehicle meets the needs of the user group for improving the cruising range under the same cost. Description of the Drawings

[0036] Figure 1It is a flowchart of a method for enhancing the driving range in an embodiment of the present invention;

[0037] Figure 2 It is a schematic diagram of the functional modules of a device for enhancing the driving range in an embodiment of the present invention.

[0038] The realization of the purpose of this application, its functional features and advantages will be further described in conjunction with the embodiments with reference to the accompanying drawings. Specific embodiments

[0039] It should be understood that the specific embodiments described herein are only used to explain this application and are not used to limit this application.

[0040] In the prior art, in the case of electric driving of hybrid vehicles, there have been many studies on how to improve the energy utilization rate to enhance the driving range of the vehicle. Usually, it is based on the modification and update of hardware facilities, or the improvement of circuit structures, or the improvement of the control of the power battery terminal, etc. However, improving the structure of hybrid vehicles will involve adding components and circuit structures, which not only makes the device structure and control process more complex, increases the cost, but also further increases the power loss components.

[0041] Generally, hybrid vehicles are equipped with an engine, a generator, a power battery, a drive motor, and a transmission. For four-wheel drive vehicles, the drive motors are further divided into: a front-wheel drive motor and a rear-wheel drive motor, and the corresponding transmissions are also divided into: a front-wheel drive transmission and a rear-wheel drive transmission. The front-wheel drive motor and the rear-wheel drive motor are each also equipped with a micro control unit (MCU, also known as a single-chip microcomputer), which receives the control of the vehicle controller (HCU) by their respective MCUs and controls the drive motor to enter different modes.

[0042] When a four-wheel drive vehicle is driving normally after being powered on, in order to save electric energy, it mostly drives in a two-wheel drive mode, that is, the rear-wheel drive motor does not intervene in the work; if the rear-wheel drive motor does not need to intervene in the work, the HCU will control the rear-wheel drive motor to 0 Nm, that is: the HCU sends a control, and the MCU controls the rear-wheel drive motor to output a torque of 0 Nm in the torque control mode. This control process is the "zero torque control" in the current technology.

[0043] However, it has been found through research that when performing "zero torque control", the rear-wheel drive motor will actually generate a torque of ±0.2 Nm in order to respond to an output torque of 0 Nm. Coupled with factors such as the power consumption of the CAN bus and the accuracy of the current sensor, in fact, finally achieving "zero torque control" will instead consume a certain amount of electric power. Through actual measurement and calculation, the consumed electric power can reach about 1.2 kw.

[0044] Similar to the case of the rear - drive motor, when the vehicle is in pure - electric mode, the generator generally does not intervene in operation, and the HCU will also control the generator to output a torque of 0 Nm. Therefore, the electric power consumed for the generator to achieve "zero - torque control" can also reach about 1.2 kW.

[0045] In view of the above - mentioned important findings, this embodiment proposes a method to reduce this power consumption. At the same time, this method also needs to consider the characteristics of the vehicle itself in different driving modes and the actual power required by the driver. Combining these two aspects of factors, it is possible to reduce the power consumption as much as possible. Specifically, the core technical concept of this method is: based on the existing vehicle architecture, without changing any hardware facilities and circuit structures, taking the selection of the generator and the rear - drive motor to enter the first preset mode and the second preset mode respectively according to the current driving mode of the vehicle as the current working condition, and recovering torque during this process to save the wasted electric energy and increase the vehicle's cruising range.

[0046] Refer to Figure 1 , an embodiment of the present application provides a method for enhancing the cruising range, including the following steps:

[0047] 101. Obtain the current driving mode of the vehicle;

[0048] In the specific implementation process, the current driving mode of the vehicle is obtained by the HCU. As the core control component of the vehicle, the HCU has functions such as energy management, torque coordination and distribution, motor and battery coordination management, safety monitoring, UDS fault diagnosis, and braking energy recovery. The HCU can determine the working mode of the motor according to the driving mode.

[0049] The current driving mode of the vehicle includes pure - electric mode and hybrid mode. In the pure - electric mode, only electric energy is used as the power to drive the vehicle. In the case of the pure - electric mode, the generator does not participate in driving. The hybrid mode means that the power is a mixture of fuel (such as gasoline, diesel, etc.) and electric energy. In the case of the hybrid mode, the generator participates in driving.

[0050] 102. According to the current driving mode, control the generator to enter the first preset mode of the generator;

[0051] In the specific implementation process, in the case of the pure - electric mode, the generator does not participate, so the generator is in the standby mode, and only the engine drives the vehicle. In the case of the hybrid mode, the generator participates in power generation, so the generator is in the working mode. Specifically, when the generator enters the working mode, it enters the torque - control mode.

[0052] 103. According to the first preset mode and the power difference between the actual required power and the target power, control the gear of the rear-wheel transmission to the first target gear, and control the rear-wheel drive motor to enter the second preset mode of the rear-wheel drive motor.

[0053] In the specific implementation process, the actual required power is the power actually required when the vehicle is running currently. The standby mode is the state where the motor does not work, that is, the rotational speed of the motor is 0 rpm. The working mode specifically includes a torque control mode and a rotational speed control mode. The torque control mode is that the HCU sends a control of 0 Nm of the motor to the MCU, and the MCU controls the rear-wheel drive motor to output a torque of 0 Nm in the torque control mode. The rotational speed control mode is that the HCU sends a control to the MCU of the rear-wheel drive motor to control the rotational speed of the rear-wheel drive motor to reach the target rotational speed, and control the gear of the rear-wheel transmission to the second target gear. Both the target rotational speed and the second target gear are set depending on the current driving state of the vehicle driver and are not limited here.

[0054] The target power can refer to a preset power. In practice, different working conditions can be processed for different driving modes. Specifically, in the pure electric mode, the generator is generally in the standby mode, and in the hybrid mode, the generator is generally in the working mode. The mode of the rear-wheel drive motor can be determined according to the power difference between the required power and the target power, that is, determine whether it is in the standby mode or the working mode according to whether the actual required power exceeds the target power. Before controlling the rear-wheel drive motor to enter the standby mode or the working mode, it is necessary to control the gear of the rear-wheel transmission to the first target gear.

[0055] In the prior art, power consumption is generated due to the need to ensure the zero-torque control method of the motor. In this solution, the working state of the generator is controlled by the current driving mode of the vehicle, and the working state of the rear-wheel drive motor is controlled according to the power difference between the actual required power and the target power. When at least one of the engine and the rear-wheel drive motor enters the standby mode, it can save the energy loss generated by the zero-torque control method while ensuring the normal operation of the vehicle, thereby saving the unnecessary power consumption of the power battery and increasing the driving range of the vehicle. Further, there are no other changes in the hardware settings and circuit structures in this solution. Only based on the change of the control logic, the above goals are achieved without any additional cost increase. The vehicle meets the needs of the user group for increasing the driving range under the same cost.

[0056] In some embodiments, the method further includes:

[0057] 104. Distribute the regenerative torque according to the second preset mode.

[0058] In the specific implementation process, the mode entered by the rear-wheel drive motor is the standby mode or the working mode of the rear-wheel drive motor in the current state. The regenerative torque is generated when the vehicle brakes or goes downhill, converting kinetic energy or potential energy into electrical energy. The torque transmitted from the wheels to the motor is the regenerative torque. The regenerative torque needs to be determined according to the current operating modes of the generator and the rear-wheel drive motor, and the regenerative torque is distributed to the front-wheel drive motor and the rear-wheel drive motor of the vehicle according to the mode entered by the rear-wheel drive motor.

[0059] For a hybrid vehicle, the energy regeneration generally distributes the regenerative torque by two drive motors when recovering energy. In the present invention, due to the different modes entered by the rear-wheel drive motor, if it is in the standby mode without power consumption, it cannot perform energy regeneration. Therefore, the HCU needs to select and distribute the regenerative torque according to the current condition of the rear-wheel drive motor.

[0060] In some embodiments, the second preset mode includes a standby mode and a working mode. Step 104 includes:

[0061] When the second preset mode is the standby mode, all the regenerative torque is distributed to the front-wheel drive motor.

[0062] As described above, when the rear-wheel drive motor is in the standby mode, the rear-wheel drive motor does not work, so it cannot perform energy regeneration. Therefore, the HCU distributes all the regenerative torque to the front-wheel drive motor, so that the regenerated torque will not be lost, making the regenerative torque more economical.

[0063] When the second preset mode is the working mode, both the front-wheel drive motor and the rear-wheel drive motor are in the working state. Therefore, the front-wheel drive motor and the rear-wheel drive motor can perform energy regeneration simultaneously, resulting in a better effect. The distribution of the regenerative torque is based on the respective real-time torques of the front-wheel drive motor and the rear-wheel drive motor, determining the respective regeneration ratios of the front-wheel drive motor and the rear-wheel drive motor, and distributing the regenerative torque to the front-wheel drive motor and the rear-wheel drive motor simultaneously according to the regeneration ratios.

[0064] It should be noted that in the above scheme for distributing the regenerative torque, the HCU can also preset the regeneration strategy in advance. When the front-wheel drive motor and the rear-wheel drive motor recover torque simultaneously, it can be preset that most of the regenerative torque is distributed to the front-wheel drive motor, for example, 60%-80% of the regenerative torque is distributed to the front-wheel drive motor, and a small part of the regenerative torque is distributed to the rear-wheel drive motor, for example, 20%-40% of the regenerative torque is distributed to the rear-wheel drive motor, or all the regenerative torque is distributed to the rear-wheel drive motor, which can be determined according to actual needs.

[0065] In some embodiments, step 102 includes:

[0066] 1021. When the driving mode is the pure - electric mode, control the generator to enter the standby mode of the generator.

[0067] In the specific implementation process, when the driving mode is the pure - electric mode, the generator does not intervene, so the generator is in the standby mode. Then, the rear - drive motor needs to enter the standby mode or the working mode according to the power difference representation. Specifically, when the power difference representation is that the actual required power does not exceed the target power, control the rear - drive motor to enter the standby mode; when the power difference representation is that the actual required power exceeds the target power, control the rear - drive motor to enter the working mode.

[0068] 1022. When the driving mode is the hybrid mode, control the generator to enter the working mode of the generator.

[0069] In the specific implementation process, when the driving mode is the hybrid mode, the generator intervenes in power generation, so the generator is in the working mode. Then, the rear - drive motor still needs to enter the standby mode or the working mode according to the power difference representation. Specifically, when the power difference representation is that the actual required power does not exceed the target power, control the rear - drive motor to enter the standby mode; when the power difference representation is that the actual required power exceeds the target power, control the rear - drive motor to enter the working mode.

[0070] It should be noted that when the driving mode is the pure - electric mode, that is, when the generator enters the standby mode, the rear - drive motor can be directly controlled to enter the second preset mode. When the driving mode is the hybrid mode, that is, when the generator enters the working mode, it is necessary to control the gear of the rear - drive transmission to be in the neutral gear, and then control the rear - drive motor to enter the standby mode or the working mode; when the rear - drive motor enters the standby mode, the speed of the rear - drive motor is 0, and the gear of the rear - drive transmission is in the neutral gear; when the rear - drive motor enters the working mode, the rear - drive motor and the front - drive motor jointly drive the vehicle.

[0071] In some embodiments, both the first preset mode and the second preset mode include the standby mode and the working mode. In this state, step 102 includes multiple situations:

[0072] T1. When the driving mode is the pure - electric mode, control the generator to enter the standby mode. At this time, the gear of the rear - drive transmission remains unchanged. When the power difference representation is that the actual required power does not exceed the target power, control the rear - drive motor to enter the standby mode.

[0073] When the driving mode of the vehicle is the pure electric mode, generally in order to save power consumption, a two-wheel drive method is adopted in which the front-wheel drive motor intervenes in work and the rear-wheel drive motor does not intervene in work. In this mode, neither the generator nor the rear-wheel drive motor intervenes in work. Therefore, these two motors can be controlled to enter the standby mode, that is, both the generator and the rear-wheel drive motor enter the standby mode without power consumption.

[0074] It should be noted that whether it is the pure electric mode or the hybrid mode, when the actual required power is relatively large, generally when the driver depresses the accelerator pedal deeply or fully, when the throttle opening exceeds the preset value, in order to respond to this demand, the rear-wheel drive motor will intervene in work, while the generator may not necessarily intervene in work. The HCU will control the modes of each motor according to the specific setting strategy. In the embodiment of the present invention, the target power is a preset empirical value. Generally, if the actual required power exceeds this preset empirical value, it is considered that the rear-wheel drive motor needs to intervene in work.

[0075] Therefore, when the driving mode is the pure electric mode and the power difference indicates that the actual required power does not exceed the target power, the HCU controls the generator to enter the standby mode without power consumption, and at the same time controls the rear-wheel drive motor to enter the standby mode without power consumption.

[0076] T2. When the driving mode is the pure electric mode, control the generator to enter the standby mode. At this time, the gear of the rear transmission remains unchanged. When the power difference indicates that the actual required power exceeds the target power, control the rear-wheel drive motor to enter the working mode.

[0077] As mentioned above, when the driving mode of the vehicle is the pure electric mode, generally in order to save power consumption, a two-wheel drive method is adopted in which the front-wheel drive motor intervenes in work and the rear-wheel drive motor does not intervene in work. In this mode, neither the generator nor the rear-wheel drive motor intervenes in work. Therefore, these two motors can be controlled to enter the standby mode, that is, both the generator and the rear-wheel drive motor enter the standby mode without power consumption.

[0078] However, when the actual required power is relatively large, in order to respond to this demand, the rear-wheel drive motor will intervene in work. Therefore, when the driving mode is the pure electric mode and the power difference indicates that the actual required power exceeds the target power, the HCU controls the generator to enter the standby mode without power consumption, and at the same time controls the rear-wheel drive motor to enter the working mode with power consumption.

[0079] T3. When the driving mode is the hybrid mode, control the generator to enter the working mode. When the power difference indicates that the actual required power does not exceed the target power, after controlling the gear of the rear-wheel transmission to be in neutral, control the rear-wheel drive motor to enter the standby mode.

[0080] When the driving mode of the vehicle is the hybrid mode, generally the power of the power battery drops and charging is required. Therefore, the generator needs to intervene in the work. It can be understood that after the generator intervenes in the work, the engine naturally starts to work. At this time, the engine and the front-wheel drive motor jointly drive the vehicle to run.

[0081] The generator needs to intervene in the work, and there is naturally power consumption of electric power. Therefore, when the driving mode is the hybrid mode, the HCU controls the generator to enter the working mode with power consumption of electric power, and when the actual required power does not exceed the preset value, at the same time controls the rear-wheel drive motor to enter the standby mode without power consumption of electric power.

[0082] T4. When the driving mode is the hybrid mode, control the generator to enter the working mode. When the power difference indicates that the actual required power exceeds the target power, after controlling the gear of the rear-wheel transmission to be in neutral, control the rear-wheel drive motor to enter the working mode.

[0083] When the driving mode of the vehicle is the hybrid mode, charging is required. Therefore, the generator needs to intervene in the work. The generator needs to intervene in the work, and there is naturally power consumption of electric power. Therefore, when the driving mode is the hybrid mode and the actual required power exceeds the target power, the HCU controls the generator to enter the working mode with power consumption of electric power, and at the same time controls the rear-wheel drive motor to enter the working mode with power consumption of electric power. It can be understood that when the rear-wheel drive motor intervenes in the work, it jointly drives the vehicle to run with the front-wheel drive motor. Of course, in the hybrid mode, the engine, the front-wheel drive motor, and the rear-wheel drive motor jointly drive the vehicle to run, and the generator charges the power battery.

[0084] In each of the situations described in the above steps T1 - T4, as long as the generator or the rear-wheel drive motor enters the standby mode without power consumption of electric power, the electric power consumed by the aforementioned "zero torque control" can be avoided, and thus the goal of enhancing the cruising range can be achieved.

[0085] In actual calculation, when both the generator and the rear-wheel drive motor enter the standby mode, about 2.2 kw of electric power can be saved. Even if only the generator or the rear-wheel drive motor enters the standby mode without power consumption of electric power alone, about 1.2 kw of electric power can be saved. The electric energy consumed by the unnecessary loss of the power battery is saved, thereby enhancing the cruising range of the vehicle, and there is no change in any hardware device and circuit structure, meeting the needs of the users for the cruising range and cost control of the vehicle.

[0086] In some embodiments, when the driving mode is a hybrid mode, controlling the generator to enter a working mode includes: when the driving mode is a hybrid mode, controlling the generator to enter a torque control mode.

[0087] In some embodiments, when the rear-wheel drive motor enters the standby mode, the rotational speed of the rear-wheel drive motor is 0.

[0088] In some embodiments, the working mode includes a rotational speed control mode and a torque control mode;

[0089] Therefore, the situations of the above steps T1 - T4 can also be specifically as follows:

[0090] When the driving mode is a pure electric mode and the power difference indicates that the actually required power does not exceed the target power, controlling the generator to enter the standby mode, and at the same time controlling the rear-wheel drive motor to enter the standby mode. When the generator enters the standby mode and the rear-wheel drive motor also enters the standby mode, the rotational speeds of both the generator and the rear-wheel drive motor are 0. During this process, the gear of the rear-wheel transmission remains in the neutral gear (N gear) continuously.

[0091] When the driving mode is a hybrid mode and the power difference indicates that the actually required power does not exceed the target power, controlling the generator to enter the torque control mode. First, controlling the gear of the rear-wheel transmission to be in the neutral gear, and then controlling the rear-wheel drive motor to enter the standby mode. When the generator enters the torque control mode and the rear-wheel drive motor enters the standby mode, the rotational speed of the generator is determined according to the control requirements of the torque control mode, the rotational speed of the rear-wheel drive motor is 0, and the gear of the rear-wheel transmission is in the neutral gear (N gear).

[0092] When the driving mode is a pure electric mode and the power difference indicates that the actually required power exceeds the target power, controlling the generator to enter the standby mode. At this time, the gear of the rear-wheel transmission is in the neutral gear, and at the same time controlling the rear-wheel drive motor to enter the working mode. When the generator enters the standby mode and the rear-wheel drive motor enters the working mode, the rotational speed of the generator is 0, the rotational speed of the rear-wheel drive motor is determined according to the control requirements of the working mode, and after the rear-wheel drive motor enters the working mode, the gear of the rear-wheel transmission is also determined according to the control requirements of the working mode and is no longer in the neutral gear.

[0093] When the driving mode is the hybrid mode and the power difference indicates that the actual required power exceeds the target power, the generator is controlled to enter the torque control mode. At this time, the gear of the rear-wheel transmission is in the neutral gear, and at the same time, the rear-wheel drive motor is controlled to enter the working mode. When the generator enters the torque control mode and the rear-wheel drive motor enters the working mode, in this case, the speed of the generator is determined according to the control requirements of the torque control mode, the speed of the rear-wheel drive motor is determined according to the control requirements of the working mode, and after the rear-wheel drive motor enters the working mode, the gear of the rear-wheel transmission is also determined according to the control requirements of the working mode and is no longer in the neutral gear.

[0094] As mentioned above, when the generator enters the working mode from the standby mode, it directly enters the torque control mode, and the steps for the rear-wheel drive motor to enter the working mode include:

[0095] The HCU requests the rear-wheel drive motor to intervene;

[0096] Control the rear-wheel drive motor to enter the speed control mode from the standby mode;

[0097] Control the speed of the rear-wheel drive motor to reach the target speed;

[0098] Control the gear of the rear-wheel transmission to the second target gear;

[0099] Control the rear-wheel drive motor to enter the torque control mode from the speed control mode, and the rear-wheel drive motor continues to operate in the torque control mode.

[0100] Specifically, generally, a two-speed transmission of a hybrid vehicle has three working states, namely neutral, first gear, and second gear. During the process of the above-mentioned rear-wheel drive motor entering the torque control mode from the standby mode, first, the speed of the rear-wheel drive motor is controlled to the speed corresponding to the first gear, then the rear-wheel transmission is matched, and then according to the actual requirements, the actual gear of the rear-wheel transmission is controlled to be the first gear or the second gear. After the rear-wheel transmission is matched with the rear-wheel drive motor, the HCU requests the MCU to control the rear-wheel drive motor to enter the torque control mode from the speed control mode. Finally, the rear-wheel drive motor continues to operate in the torque control mode until the HCU requests the rear-wheel drive motor to enter the standby mode.

[0101] In the above process, the specific process of the mode transformation of the rear-wheel drive motor is specifically described. In the states of large throttle and full throttle conditions and when the throttle opening is greater than the preset value, the HCU timely controls the rear-wheel drive motor to intervene in driving through the above process, timely increases the power performance of the vehicle, and prevents the driving experience of the vehicle driver from being reduced due to untimely power supply.

[0102] It should be noted that when the rear - drive motor is in the standby mode, if the HCU detects that the throttle opening is greater than the preset value, it indicates that the driver needs to control the vehicle to accelerate. At this time, the HCU controls the gear of the rear - drive transmission to the forward gear, and at the same time controls the rear - drive motor to intervene in driving. At this time, the rear - drive motor and the front - drive motor are both in the working state, meeting the driver's power requirements.

[0103] In addition, when the rear - drive motor is in the standby mode, if it is detected that the brake pedal is depressed, it indicates that the driver needs to control the vehicle to decelerate. At this time, the HCU controls the gear of the rear - drive transmission to the forward gear or the reverse gear for energy recovery.

[0104] As Figure 2 shown, based on the above - mentioned method for enhancing the cruising range, an embodiment of the present invention further provides a device for enhancing the cruising range, including:

[0105] An acquisition module: used to acquire the current driving mode of the vehicle;

[0106] A first control module: used to control the generator to enter the first preset mode of the generator according to the current driving mode;

[0107] A second control module: used to control the gear of the rear - drive transmission to the first target gear according to the first preset mode and the power difference between the actual required power and the target power, and control the rear - drive motor to enter the second preset mode of the rear - drive motor.

[0108] In some embodiments, the device further includes:

[0109] A distribution module: used to distribute the recovered torque according to the second preset mode.

[0110] In some embodiments, the distribution module includes:

[0111] A first distribution sub - module: used to fully distribute the recovered torque to the front - drive motor when the second preset mode is the standby mode;

[0112] A second distribution sub - module: used to determine the respective recovery ratios of the front - drive motor and the rear - drive motor based on the respective real - time torques of the front - drive motor and the rear - drive motor when the second preset mode is the working mode, and distribute the recovered torque to the front - drive motor and the rear - drive motor simultaneously according to the recovery ratios.

[0113] In some embodiments, the first control module includes:

[0114] The first control sub-module: configured to control the generator to enter the standby mode of the generator when the driving mode is the pure electric mode;

[0115] The second control sub-module: configured to control the generator to enter the working mode of the generator when the driving mode is the hybrid mode.

[0116] In some embodiments, the second control module is specifically configured to:

[0117] When the power difference indicates that the actual required power does not exceed the target power, control the gear of the rear-wheel transmission to the first target gear and control the rear-wheel drive motor to enter the standby mode; or,

[0118] When the power difference indicates that the actual required power exceeds the target power, control the gear of the rear-wheel transmission to the first target gear and control the rear-wheel drive motor to enter the working mode.

[0119] In some embodiments, the working mode includes a speed control mode and a torque control mode, and the second control module is further specifically configured to:

[0120] When controlling the rear-wheel drive motor to enter the working mode, control the rear-wheel drive motor to enter the speed control mode from the standby mode;

[0121] Control the speed of the rear-wheel drive motor to reach the target speed;

[0122] Control the gear of the rear-wheel transmission to the second target gear;

[0123] Control the rear-wheel drive motor to enter the torque control mode from the speed control mode, and the rear-wheel drive motor continuously operates in the torque control mode.

[0124] In some embodiments, the second control sub-module is further configured to: when the driving mode is the hybrid mode, control the generator to enter the torque control mode.

[0125] Based on the above method for enhancing the cruising range, an embodiment of the present invention further provides a vehicle, which includes: a vehicle control unit;

[0126] The vehicle control unit is configured to execute the method for enhancing the cruising range described in the above step 101-step 103.

[0127] It should also be noted that in this text, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method including a series of elements not only includes those elements, but also includes other elements not expressly listed, or also includes elements inherent in such a process, method.

[0128] The embodiments of the present invention have been described above in conjunction with the accompanying drawings. Specific examples are used in this text to elaborate on the principles and implementation manners of the present invention. The description of the above embodiments is only used to help understand the method and its core idea of the present invention; at the same time, for those of ordinary skill in the art, according to the idea of the present invention, there will be changes in the specific implementation manners and application scopes. In summary, the content of this specification should not be construed as a limitation on the present invention.

Claims

1. A method for enhancing the driving range, characterized in that, Including: Obtain the current driving mode of the vehicle; According to the current driving mode, control the generator to enter the first preset mode of the generator; According to the first preset mode and the power difference between the actual required power and the target power, control the gear of the rear-wheel transmission to be the first target gear, and control the rear-wheel drive motor to enter the second preset mode of the rear-wheel drive motor; Among them, the controlling the generator to enter the first preset mode of the generator according to the current driving mode includes: In the case where the driving mode is the pure electric mode, control the generator to enter the standby mode of the generator; or, in the case where the driving mode is the hybrid mode, control the generator to enter the working mode of the generator; Among them, according to the first preset mode and the power difference between the actual required power and the target power, controlling the gear of the rear-wheel transmission to be the first target gear and controlling the rear-wheel drive motor to enter the second preset mode of the rear-wheel drive motor includes: In the case where the power difference indicates that the actual required power does not exceed the target power, control the gear of the rear-wheel transmission to be the first target gear and control the rear-wheel drive motor to enter the standby mode; or, in the case where the power difference indicates that the actual required power exceeds the target power, control the gear of the rear-wheel transmission to be the first target gear and control the rear-wheel drive motor to enter the working mode; Among them, at least one of the engine and the rear-wheel drive motor enters the standby mode to save the energy loss generated by the zero torque control method while ensuring the normal operation of the vehicle.

2. The method according to claim 1, wherein The method further includes: Allocate the recovered torque according to the second preset mode.

3. The method according to claim 2, characterized in that The second preset mode includes a standby mode and a working mode. Allocating the recovered torque according to the second preset mode includes: In the case where the second preset mode is the standby mode, allocate all of the recovered torque to the front-wheel drive motor; or, In the case where the second preset mode is the working mode, based on the respective real-time torques of the front-wheel drive motor and the rear-wheel drive motor, determine the respective recovery ratios of the front-wheel drive motor and the rear-wheel drive motor, and allocate the recovered torque to the front-wheel drive motor and the rear-wheel drive motor simultaneously according to the recovery ratios.

4. The method according to claim 1, wherein The working mode includes a speed control mode and a torque control mode, where: In the case of controlling the rear-wheel drive motor to enter the working mode, control the rear-wheel drive motor to enter the speed control mode from the standby mode; Control the speed of the rear-wheel drive motor to reach the target speed; Control the gear of the rear-wheel transmission to be the second target gear; Control the rear-wheel drive motor to enter the torque control mode from the speed control mode, and the rear-wheel drive motor continuously operates in the torque control mode.

5. The method according to claim 1, wherein In the case where the driving mode is the hybrid mode, controlling the generator to enter the working mode includes: In the case where the driving mode is the hybrid mode, control the generator to enter the torque control mode.

6. A device for enhancing the cruising range, characterized in that, Including: Acquisition module: used to acquire the current driving mode of the vehicle; First control module: used to control the generator to enter the standby mode of the generator when the driving mode is the pure electric mode; Or, when the driving mode is the hybrid mode, control the generator to enter the working mode of the generator; Second control module: used to control the gear of the rear-wheel transmission to the first target gear and control the rear-wheel drive motor to enter the standby mode when the power difference indicates that the actual required power does not exceed the target power; or, when the power difference indicates that the actual required power exceeds the target power, control the gear of the rear-wheel transmission to the first target gear and control the rear-wheel drive motor to enter the working mode; wherein, at least one of the engine and the rear-wheel drive motor enters the standby mode to save the energy loss generated by the zero-torque control method while ensuring the normal operation of the vehicle.

7. A vehicle, characterized in that, The vehicle includes: a vehicle control unit; The vehicle control unit is used to execute the method for enhancing the cruising range according to any one of claims 1-5.

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