A control method, device and vehicle for a hybrid vehicle

Abstract

The present invention provides a control method, device and vehicle for a hybrid vehicle, which is applicable to a vehicle including a single-motor hybrid system. During high-voltage power-on operation of the vehicle, the vehicle's operating information is obtained in real time; if the operating information meets a preset low-speed creeping condition, the current battery power of the vehicle's motor is obtained; a target vehicle control scheme that matches the battery power is determined from various pre-set vehicle control schemes; and the vehicle's travel is controlled based on the target vehicle control scheme, with the goal of reducing the vehicle's energy consumption during low-speed creeping.

Description

Technical Field

[0001] The present invention relates to the technical field of hybrid electric vehicles, and more particularly to a method, a device and a vehicle for hybrid electric vehicles. Background Art

[0002] With the continuous development of new energy technologies, hybrid electric vehicles are becoming more and more widely used. The economic efficiency of hybrid electric vehicles during driving is also attracting more and more attention, especially the energy consumption of hybrid vehicles during low-speed creeping operation. Among them, the hybrid vehicle can be a P2 architecture hybrid vehicle.

[0003] Therefore, how to provide a control method for a hybrid vehicle to reduce the energy consumption of the hybrid vehicle during driving under low-speed creep conditions is an urgent problem that needs to be solved in this application. Summary of the Invention

[0004] In view of this, the present invention provides a control method, device and vehicle for a hybrid vehicle, aiming to reduce the energy consumption of the hybrid vehicle under low-speed creeping conditions.

[0005] A first aspect of the present invention provides a control method for a hybrid vehicle, applicable to a vehicle including a single-motor hybrid system, the method comprising:

[0006] During the high-voltage power-on operation of the vehicle, the vehicle's operating information can be obtained in real time;

[0007] If the operating information satisfies a preset low-speed creep condition, obtaining a current battery charge of a motor of the vehicle;

[0008] Determining a target vehicle control scheme that matches the battery power from various pre-set vehicle control schemes;

[0009] The vehicle is controlled to travel based on the target vehicle control scheme to enable the vehicle to perform low-speed creeping.

[0010] Optionally, the operating information includes gear position and vehicle speed, and the method further includes:

[0011] determining whether the vehicle speed is within a preset creeping speed range, or whether the gear position is a preset gear position and the vehicle speed is a preset speed;

[0012] If the vehicle speed is within the preset creeping speed range, or the gear is the target gear and the vehicle speed is the preset speed, determining that the operating information satisfies a preset low-speed creeping condition;

[0013] If the vehicle speed is not within the preset creeping speed range, and / or the gear is not the target gear, and / or the vehicle speed is not the preset speed, it is determined that the operating information does not meet the preset low-speed creeping condition.

[0014] Optionally, determining a target vehicle control scheme that matches the battery power level from various pre-set vehicle control schemes includes:

[0015] Determining whether the battery power is greater than a first power threshold;

[0016] If the battery power is greater than the first power threshold, determining a first vehicle control scheme among various pre-set vehicle control schemes as a target vehicle control scheme;

[0017] If the battery power is less than or equal to the first power threshold and the battery power is greater than a second power threshold, determining the second vehicle control scheme among the preset vehicle control schemes as the target vehicle control scheme;

[0018] If the battery power is less than the second power threshold and the battery power is greater than or equal to a third power threshold, determining a third vehicle control scheme among the preset vehicle control schemes as a target vehicle control scheme;

[0019] If the battery power is less than the third power threshold, a fourth vehicle control scheme among the preset vehicle control schemes is determined as the target vehicle control scheme.

[0020] Optionally, the single-motor hybrid system includes at least a torque converter. If the target vehicle control scheme is the first vehicle control scheme or the second vehicle control scheme, controlling the vehicle based on the target vehicle control scheme to achieve low-speed creeping of the vehicle includes:

[0021] Obtaining the current depth of the vehicle's accelerator pedal, and determining the engine speed and engine torque based on the depth of the accelerator pedal;

[0022] The engine is stopped, the torque converter is opened, and the motor is controlled to simulate the engine speed and engine torque, so as to enable the vehicle to creep at a low speed.

[0023] Optionally, if the target vehicle control scheme is the first vehicle control scheme or the second vehicle control scheme, controlling the vehicle to travel based on the target vehicle control scheme to achieve low-speed creeping of the vehicle includes:

[0024] Obtaining the current depth of the vehicle's accelerator pedal, and determining the engine speed and engine torque based on the depth of the accelerator pedal;

[0025] The engine is controlled to stop, the working state of the torque converter is set to a target state, and the motor is controlled to simulate the engine speed and engine torque to enable the vehicle to creep at a low speed in a pure electric mode; wherein the target state is not an open state.

[0026] Optionally, if the target vehicle control scheme is the second vehicle control scheme, controlling the vehicle to travel based on the target vehicle control scheme to achieve low-speed creeping of the vehicle includes:

[0027] Obtaining the current depth of the vehicle's accelerator pedal, and determining the engine speed and engine torque based on the depth of the accelerator pedal;

[0028] Opening the torque converter, controlling the engine to start, and controlling the engine to maintain a target low torque to achieve charging in the P gear or creeping discharge in the D gear of the vehicle;

[0029] The motor is controlled to simulate the engine speed and engine torque to enable the vehicle to creep at a low speed.

[0030] Optionally, if the target vehicle control scheme is a third vehicle control scheme, controlling the vehicle to travel based on the target vehicle control scheme to achieve low-speed creeping of the vehicle includes:

[0031] Obtaining the current depth of the vehicle's accelerator pedal, and determining the engine speed and engine torque based on the depth of the accelerator pedal;

[0032] opening a torque converter, controlling the engine to start, and adjusting the torque and speed of the engine according to the engine torque and engine speed;

[0033] The motor is controlled to maintain a target low torque to achieve low-speed creeping of the vehicle, and the motor is charged when the vehicle is creeping at low speed.

[0034] Optionally, if the target vehicle control scheme is a fourth vehicle control scheme, controlling the vehicle to travel based on the target vehicle control scheme to achieve low-speed creeping of the vehicle includes:

[0035] Obtaining the current depth of the vehicle's accelerator pedal, and determining the engine speed and engine torque based on the depth of the accelerator pedal;

[0036] opening a torque converter, controlling the engine to start, and adjusting the torque and speed of the engine according to the engine torque and engine speed;

[0037] The motor is controlled to maintain a target high torque to achieve low-speed creeping of the vehicle, and the motor is charged when the vehicle is creeping at low speed.

[0038] A second aspect of the present invention provides a control device for a hybrid vehicle, applicable to a vehicle including a single-motor hybrid system, the device comprising:

[0039] An operation information acquisition unit is used to acquire the vehicle's operation information in real time when the vehicle is in high-voltage power-on operation;

[0040] a battery power acquisition unit, configured to acquire the current battery power of the vehicle's motor if the operating information satisfies a preset low-speed creep condition;

[0041] a first determining unit, configured to determine a target vehicle control scheme that matches the battery power level from various preset vehicle control schemes;

[0042] A control unit is used to control the vehicle driving based on the target vehicle control scheme to enable the vehicle to creep at a low speed.

[0043] A third aspect of the present invention provides a vehicle, comprising the control device for the hybrid vehicle provided by the second aspect of the present invention.

[0044] The present invention provides a control method, device, and vehicle for a hybrid vehicle. During the vehicle's high-voltage power-on operation, the method can obtain vehicle operating information and, when the operating information satisfies a preset low-speed creep condition, i.e., when it is determined that the vehicle is currently in a low-speed creep operating condition, obtain the current battery charge of the vehicle's motor, so as to determine a target vehicle control scheme that matches the battery charge from various pre-set vehicle control schemes. Finally, the vehicle is controlled based on the target vehicle control scheme to achieve low-speed creeping of the vehicle. The technical solution provided by the present invention can reasonably select an appropriate vehicle control scheme based on the current battery charge of the motor to control the vehicle to perform low-speed creeping when the vehicle is currently in a low-speed creeping operating condition, thereby reducing the energy consumption of the hybrid vehicle in the low-speed creeping operating condition. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are merely embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying any creative work.

[0046] Figure 1 A structural diagram of a single-motor hybrid system provided by an embodiment of the present invention;

[0047] Figure 2 A structural diagram of a single-motor P2 hybrid system provided by an embodiment of the present invention;

[0048] Figure 3 A schematic flow chart of a hybrid vehicle control method provided by an embodiment of the present invention;

[0049] Figure 4 An example diagram of controlling the vehicle's travel based on the target vehicle control scheme when the current battery charge of the motor is high or the battery charge is balanced is provided in an embodiment of the present invention;

[0050] Figure 5 Another example diagram of controlling the vehicle's travel based on the target vehicle control scheme when the current battery charge of the motor is high or the battery charge is balanced is provided in an embodiment of the present invention;

[0051] Figure 6 An example diagram of controlling the vehicle's travel based on the target vehicle control scheme provided by an embodiment of the present invention when the current battery power of the motor is balanced;

[0052] Figure 7 An example diagram of controlling the vehicle's travel based on the target vehicle control scheme when the current battery power of the motor is low is provided in an embodiment of the present invention;

[0053] Figure 8 An example diagram of controlling the vehicle's travel based on the target vehicle control scheme when the current battery power level of the battery is lower, provided by an embodiment of the present invention;

[0054] Figure 9 A schematic structural diagram of a control device for a hybrid vehicle provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0055] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0056] As used herein, the term "including" and its variations are open-ended, i.e., "including but not limited to." The term "based on" means "based, at least in part, on." The term "one embodiment" means "at least one embodiment," the term "another embodiment" means "at least one additional embodiment," and the term "some embodiments" means "at least some embodiments." Other terms are defined in the following description.

[0057] It should be noted that the concepts of "first" and "second" mentioned in the disclosure of the present invention are only used to distinguish different devices, modules or units, and are not used to limit the order or interdependence of the functions performed by these devices, modules or units.

[0058] It should be noted that the modifications of "one" and "multiple" mentioned in the disclosure of the present invention are illustrative rather than restrictive, and those skilled in the art should understand that unless otherwise clearly indicated in the context, they should be understood as "one or more".

[0059] See also Figure 1 , shows a structural schematic diagram of a single-motor hybrid system provided by an embodiment of the present invention, wherein the single-motor hybrid system includes an engine, a motor, a clutch, a torque converter, a transmission and a high-voltage battery.

[0060] As a preferred embodiment of the present application, the single-motor hybrid system provided in the present application can be a single-motor P2 hybrid system, which includes an engine, a P2 motor, a clutch, a torque converter, an AT transmission, a high-voltage battery and low-voltage accessories; wherein the connection structure between the engine, the P2 motor, the clutch, the torque converter, the AT transmission, the high-voltage battery and the low-voltage accessories in the single-motor P2 hybrid system is as follows: Figure 2 shown.

[0061] It should be noted that Figure 2 The hydraulic converter is the hydraulic torque converter, the transmission is the AT transmission, and the accessories are the low-pressure accessories.

[0062] It should also be noted that the motor in the single-motor hybrid system provided in the implementation of this application can be not only a P2 motor, but also a P1 motor, a P2.5 single machine, a P3 motor, a P4 motor, etc., which can be set according to actual applications and is not limited in the embodiments of this application.

[0063] It should also be noted that the clutch may be a K0 clutch, and the torque converter may be a TC torque converter.

[0064] See also Figure 3, shows a flow chart of a hybrid vehicle control method provided by an embodiment of the present invention. The hybrid vehicle control method is applicable to a vehicle including a single-motor hybrid system. The hybrid vehicle control method specifically includes the following steps:

[0065] S301: While the vehicle is running at high voltage, obtain the vehicle's operating information in real time.

[0066] In an embodiment of the present application, when it is detected that the vehicle has successfully completed high-voltage power-up, that is, the vehicle is in high-voltage ready operation, the current operation information of the vehicle can be obtained in real time.

[0067] It should be noted that the vehicle's operating information may include the vehicle's current gear position and speed.

[0068] S302: Determine whether the vehicle's operating information meets the preset low-speed creeping condition; if the vehicle's operating information meets the preset low-speed creeping condition, execute step S303.

[0069] During the specific execution of step S302, after obtaining the current operating information of the vehicle, it is possible to further determine whether the current speed of the vehicle, or the current speed and gear of the vehicle meet the preset low-speed creeping conditions. If it is determined that the current speed of the vehicle, or the current speed and gear of the vehicle meet the preset low-speed creeping conditions, step S303 can be executed; if the current speed of the vehicle, or the current speed and gear of the vehicle do not meet the preset low-speed creeping conditions, it is possible to return to execute step S301.

[0070] In an embodiment of the present application, a preset low-speed creeping condition can be set in advance. Specifically, the preset low-speed creeping condition can indicate that the vehicle's current gear is a preset gear and the vehicle speed is a preset speed, or the vehicle's current speed is within a preset creeping speed range.

[0071] For example, the preset gear position may be P gear or D gear, and the preset vehicle speed may be 0 kph.

[0072] It should be noted that the preset creeping speed range can be set according to historical creeping speeds. The preset creeping speed range can be set according to actual applications and is not limited in the embodiments of the present application.

[0073] It should also be noted that when the vehicle's current operating information meets the preset low-speed creeping condition, the vehicle can be considered to be in a low-speed creeping condition, wherein the low-speed creeping condition may include parking idling, creeping condition, low-speed driving and other conditions.

[0074] Optionally, the specific process of determining whether the vehicle's operating information meets the preset low-speed creeping condition can be: determining whether the vehicle speed is within the preset creeping speed range, or whether the gear is the preset gear and the vehicle speed is the preset speed; if the vehicle speed is within the preset creeping speed range, or the gear is the target gear and the vehicle speed is the preset speed, determining that the operating information meets the preset low-speed creeping condition; if the vehicle speed is not within the preset creeping speed range, and / or the gear is not the target gear, and / or the vehicle speed is not the preset speed, determining that the operating information does not meet the preset low-speed creeping condition.

[0075] It should be noted that if the vehicle speed is not within the preset creeping speed range, it is determined that the operating information does not meet the preset low-speed creeping condition; or the gear position is not the target gear position, it is determined that the operating information does not meet the preset low-speed creeping condition; or the vehicle speed is not the preset speed, it is determined that the operating information does not meet the preset low-speed creeping condition; or the gear position is not the target gear position and the vehicle speed is not the preset speed, it is determined that the operating information does not meet the preset low-speed creeping condition; or the vehicle speed is not within the preset creeping speed range, the gear position is not the target gear position and the vehicle speed is not the preset speed, it is determined that the vehicle speed is not the preset speed.

[0076] S303: Obtain the current battery power of the vehicle's motor, and determine a target vehicle control scheme that matches the battery power from various pre-set vehicle control schemes.

[0077] In an embodiment of the present application, multiple power thresholds related to the battery power of the motor can be pre-set, wherein the multiple power thresholds can include three power thresholds, namely a first power threshold, a second power threshold, and a third power threshold.

[0078] In this embodiment, the first power threshold is greater than the second power threshold, and the second power threshold is greater than the third power threshold.

[0079] For example, the third power threshold may be 10% of the total battery power, the second power threshold may be 40% of the total battery power, and the first battery power threshold may be 60% of the total battery power.

[0080] In an embodiment of the present application, four power threshold ranges can also be generated based on the three power thresholds, and a vehicle control scheme corresponding to each power threshold range can be set; wherein the four power threshold ranges are respectively greater than the first power threshold, less than or equal to the first power threshold, greater than or equal to the second power threshold, less than the second power threshold and greater than or equal to the third power threshold, and less than the third power threshold.

[0081] It should be noted that the vehicle control scheme corresponding to the power threshold range being greater than the first power threshold is the first vehicle control scheme; the vehicle control scheme corresponding to the power threshold range being less than the first power threshold and greater than or equal to the second power threshold is the second vehicle control scheme; the vehicle control scheme corresponding to the power threshold range being less than the second power threshold and greater than or equal to the third power threshold is the third vehicle control scheme; and the vehicle control scheme corresponding to the power threshold range being less than the third power threshold is the fourth vehicle control scheme.

[0082] As a preferred embodiment of the present application, the first vehicle control scheme includes: controlling the engine to stop, turning on the torque converter, and controlling the motor to simulate the engine speed and torque according to the current depth of the vehicle's accelerator pedal to drive the vehicle to achieve EV driving, P gear driving, or creeping; or controlling the engine to stop, setting the working state of the torque converter to the target state, and controlling the motor to simulate the engine speed and torque according to the current depth of the vehicle's accelerator pedal to enable the vehicle to creep at low speed in pure electric mode.

[0083] In this embodiment, the torque converter includes three working states, namely, OPEN state, LOCK state and SLIP state, and the target states are LOCK state and SLIP state.

[0084] It should be noted that opening the torque converter means setting the working state of the torque converter to the OPEN state.

[0085] The second vehicle control scheme includes: controlling the engine to stop, opening the torque converter, and controlling the motor to simulate the engine speed and torque according to the current depth of the vehicle's accelerator pedal to drive the vehicle to achieve EV driving, P gear driving or creeping; or controlling the engine to stop, setting the working state of the torque converter to the target state, and controlling the motor to simulate the engine speed and torque according to the current depth of the vehicle's accelerator pedal to achieve low-speed creeping of the vehicle in pure electric mode; or opening the torque converter, controlling the engine to start, and controlling the engine to maintain the target low torque to achieve P gear charging of the vehicle, or D gear creep discharge; at the same time, controlling the motor to simulate the engine speed and torque according to the current depth of the vehicle's accelerator pedal to achieve low-speed creeping of the vehicle.

[0086] The third vehicle control scheme can be: opening the torque converter, controlling the engine start, adjusting the engine torque and speed according to the current depth of the vehicle's accelerator pedal, and controlling the motor to maintain the target low torque to achieve low-speed creeping of the vehicle, and to achieve low-power charging of the motor under low-speed creeping of the vehicle.

[0087] It should be noted that the target low torque may be 40 Nm; the target high torque may be 100 Nm; and the corresponding target low torque and target high torque may be set according to actual application.

[0088] In this embodiment, assuming that the motor maintains low-power charging during vehicle creep, a target low torque can be determined based on the vehicle's current engine speed and low power. The target low torque is equal to the target power multiplied by a preset coefficient and then divided by the engine speed.

[0089] For example, when the low power is 2 kW and the preset coefficient is 9550, the target low torque is equal to 19100 (low power multiplied by the preset coefficient) / engine speed.

[0090] The fourth vehicle control scheme can be: opening the torque converter, controlling the engine start, adjusting the engine torque and speed according to the current depth of the vehicle's accelerator pedal, and controlling the motor to maintain the target high torque to achieve low-speed creeping of the vehicle, and to achieve high-power charging of the motor under low-speed creeping of the vehicle.

[0091] In this embodiment, assuming that the motor maintains high power charging while the vehicle is creeping at low speed, the target low torque can be determined based on the vehicle's current engine speed and high power. The target low torque is equal to the target power multiplied by a preset coefficient and then divided by the engine speed.

[0092] For example, when the high power is 5 kW and the preset coefficient is 9550, the target high torque is equal to 47750 / engine speed.

[0093] Optionally, in an embodiment of the present application, when it is determined that the current operating information of the vehicle meets the preset low-speed creeping condition, the current battery charge of the vehicle's motor can be obtained to determine whether the battery charge is greater than a first charge threshold; if the battery charge is greater than the first charge threshold, the first vehicle control scheme among the pre-set vehicle control schemes is determined as the target vehicle control scheme; if the battery charge is less than or equal to the first charge threshold, and the battery charge is greater than the second charge threshold, the second vehicle control scheme among the pre-set vehicle control schemes is determined as the target vehicle control scheme; if the battery charge is less than the second charge threshold, and the battery charge is greater than or equal to the third charge threshold, the third vehicle control scheme among the pre-set vehicle control schemes is determined as the target vehicle control scheme; if the battery charge is less than the third charge threshold, the fourth vehicle control scheme among the pre-set vehicle control schemes is determined as the target vehicle control scheme.

[0094] S304: Controlling vehicle travel based on the target vehicle control scheme to achieve low-speed creeping of the vehicle.

[0095] During the specific execution of step S304, after determining the target vehicle control scheme that matches the current battery power of the vehicle, the vehicle driving can be controlled based on the target vehicle control scheme to achieve low-speed creeping of the vehicle, thereby achieving the purpose of reducing the energy consumption of the hybrid vehicle under low-speed creeping conditions.

[0096] As a preferred embodiment of the present application, if the target vehicle control scheme is the first vehicle control scheme or the second vehicle control scheme, the current depth of the vehicle's accelerator pedal can be obtained, and the engine speed and engine torque can be determined based on the depth of the accelerator pedal; the engine is controlled to stop, the torque converter is turned on, and the motor is controlled to simulate the engine speed and engine torque, so as to drive the vehicle to perform low-speed creep by controlling the motor to simulate the engine speed and engine torque. The present application avoids the intervention of the engine by utilizing a motor combined with a torque converter, thereby reducing the energy consumption of the hybrid vehicle under low-speed creeping conditions during the low-speed creeping process of the hybrid vehicle, thereby improving the economy of the hybrid vehicle under low-speed creeping conditions.

[0097] For example, see Figure 4 When the current battery power of the motor is high or the battery power is balanced, the target vehicle control scheme can be determined as the first vehicle control scheme or the second vehicle control scheme, and then the vehicle can be driven by controlling the engine to stop, opening the TC torque converter, and controlling the P2 motor to simulate the engine speed and engine torque. The P2 motor can be used to simulate the engine to drive the vehicle for low-speed creeping. By combining the P2 motor with the TC torque converter, the engine intervention is avoided, and the energy consumption of the hybrid vehicle under low-speed creeping conditions is reduced during the low-speed creeping process of the hybrid vehicle, thereby improving the economy of the hybrid vehicle under low-speed creeping conditions.

[0098] As another preferred embodiment of the present application, if the target vehicle control scheme is the first vehicle control scheme or the second vehicle control scheme, the current depth of the vehicle's accelerator pedal can also be obtained, and the engine speed and engine torque can be determined based on the depth of the accelerator pedal, so as to control the engine shutdown, set the working state of the torque converter to the target state, and control the motor to simulate the engine speed and engine torque, so as to achieve low-speed creeping of the vehicle in pure electric mode, thereby avoiding energy loss of the motor simulating idle conditions, and at the same time increasing energy recovery near the vehicle speed of low-speed creeping, further achieving the purpose of reducing the energy consumption of hybrid vehicles under low-speed creeping conditions, thereby further improving the economy of hybrid vehicles under low-speed creeping conditions.

[0099] For example, see Figure 5When the target vehicle control scheme is the first vehicle control scheme or the second vehicle control scheme, the vehicle can also be driven by controlling the engine shutdown, setting the torque converter to the LOCK state / SILP state, and controlling the P2 motor to simulate the engine speed and engine torque. The vehicle can be driven by the P2 motor to creep at low speed in pure electric mode without the need for engine intervention, thereby further achieving the purpose of reducing the energy consumption of hybrid vehicles under low-speed creeping conditions.

[0100] As another preferred embodiment of the present application, if the target vehicle control scheme is the second vehicle control scheme, the current depth of the vehicle's accelerator pedal can also be obtained, and the engine speed and engine torque can be determined based on the depth of the accelerator pedal, so as to realize the vehicle's P gear charging or D gear creep discharge by opening the torque converter, controlling the engine start, and controlling the engine to maintain the target low torque. At the same time, the motor is controlled to simulate the engine speed and engine torque, and the unique torque characteristics of the torque converter are used to drive the motor to drive the vehicle, so as to realize the low-speed creep of the vehicle, thereby achieving the effect of reducing fuel consumption; and, by controlling the engine to maintain the economic operating point at the target low torque unchanged, the economy of the hybrid vehicle under low-speed creeping conditions can be further improved.

[0101] For example, see Figure 6 When the current battery power of the motor is appropriate, that is, the battery power is relatively balanced, the target vehicle control scheme can be determined as the second vehicle control scheme, and then the P2 motor can be maintained at low power charging at idle speed by opening the TC torque converter, controlling the engine to start, and controlling the engine to maintain the target low torque; and the P2 motor can be controlled to simulate the engine speed and engine torque, and the unique torque characteristics of the torque converter can be used to drive the motor to drive the vehicle to perform low-speed creep, thereby further achieving the purpose of reducing the energy consumption of the hybrid vehicle under low-speed creep conditions.

[0102] It should be noted that, from Figure 6 It can be seen that by turning on the TC torque converter at this time, the unique torque characteristics of the torque converter can be further utilized to effectively drive the P2 motor to maintain low power to drive the vehicle at idle speed, without increasing the engine torque, thereby achieving the effect of reducing fuel consumption.

[0103] It's also worth noting that because torque converters have a relatively low efficiency, typically around 87%, and they incorporate hardware such as a hydraulic lockup clutch, the hydraulic lockup clutch can be used to directly control the hybrid vehicle's operation at low speeds. This allows the electric motor to control the hybrid vehicle's operation at low speeds, during creeping, and starting conditions, while the hydraulic lockup clutch can be used to directly drive the hybrid vehicle in these conditions, thereby reducing fuel consumption.

[0104] As a preferred solution of the embodiment of the present application, if the target vehicle control scheme is the third vehicle control scheme, the current depth of the vehicle's accelerator pedal can be obtained, and the engine speed and engine torque can be determined based on the depth of the accelerator pedal, so as to open the torque converter, control the engine start, adjust the engine torque and speed based on the engine torque and engine speed, and control the motor to maintain the target low torque, so as to utilize the hydraulic lock clutch in the torque converter to drive the motor to drive the vehicle to perform low-speed creeping, thereby achieving the purpose of reducing the energy consumption of the hybrid vehicle under low-speed creeping conditions; and controlling the motor to maintain low-power charging under low-speed creeping of the vehicle; and, by starting the engine, so that the engine actively responds to the corresponding engine torque, the purpose of maintaining the current battery power balance is achieved, while avoiding charging the BSM and only maintaining the effectiveness of the low-voltage accessories.

[0105] For example, see Figure 7 When the current battery power of the motor is low, the target vehicle control scheme can be determined as the third vehicle control scheme, and then the TC torque converter can be turned on, the engine start can be controlled, the engine torque and speed can be adjusted according to the engine torque and engine speed, and the P2 motor can be controlled to maintain the target low torque, so as to utilize the hydraulic lock clutch in the torque converter to drive the motor to drive the vehicle to perform low-speed creeping, thereby achieving the purpose of reducing the energy consumption of the hybrid vehicle under low-speed creeping conditions; and controlling the motor to maintain low-power charging under low-speed creeping of the vehicle; and, by starting the engine, so that the engine actively responds to the corresponding engine torque, the purpose of maintaining the current battery power balance is achieved, while avoiding charging the BMS and only maintaining the effectiveness of the low-voltage accessories.

[0106] As a preferred solution of the embodiment of the present application, if the target vehicle control is the fourth vehicle control solution, the current depth of the vehicle's accelerator pedal can be obtained, and the engine speed and engine torque can be determined according to the depth of the accelerator pedal, so as to open the torque converter, control the engine start, adjust the engine torque and speed according to the engine torque and engine speed, and control the motor to maintain the target high torque, so as to utilize the hydraulic lock clutch in the torque converter to drive the motor to drive the vehicle to perform low-speed creeping, thereby achieving the purpose of reducing the energy consumption of the hybrid vehicle under low-speed creeping conditions; and controlling the motor to maintain the target high torque, so as to achieve high-power charging of the motor under low-speed creeping of the vehicle; by starting the engine and controlling the engine to respond to the corresponding torque, the BMS can be appropriately charged, further ensuring the battery power of the motor.

[0107] For example, see Figure 8When the current battery power level of the battery is lower, the target vehicle control scheme can be determined as the fourth vehicle control scheme, and then the torque converter can be turned on, the engine start can be controlled, the engine torque and speed can be adjusted according to the engine torque and engine speed, and the P2 motor can be controlled to maintain the target high torque, so as to utilize the hydraulic lock clutch in the torque converter to drive the motor to drive the vehicle to perform low-speed creeping, thereby achieving the purpose of reducing the energy consumption of the hybrid vehicle under low-speed creeping conditions; and controlling the motor to maintain the target high torque, so as to achieve high-power charging of the motor under low-speed creeping of the vehicle; by starting the engine and controlling the engine to respond to the corresponding torque, the BMS can be appropriately charged, further ensuring the battery power of the motor.

[0108] It should be noted that, from Figure 8 It can also be seen that while the engine drives the vehicle to creep at low speed, it can also generate electricity, thereby charging the BMS and further ensuring the battery power of the motor.

[0109] The present invention provides a control method for a hybrid vehicle. During the vehicle's high-voltage power-on operation, the method can obtain the vehicle's operating information and, when the operating information satisfies a preset low-speed creep condition, that is, when it is determined that the vehicle is currently in a low-speed creep condition, obtain the current battery charge of the vehicle's motor, so as to determine a target vehicle control scheme that matches the battery charge from various pre-set vehicle control schemes. Finally, the vehicle is controlled based on the target vehicle control scheme to achieve low-speed creep. The technical solution provided by the present invention can reasonably select an appropriate vehicle control scheme based on the current battery charge of the motor to control the vehicle to perform low-speed creep when the vehicle is currently in a low-speed creep condition. That is, the distribution of motor and engine torque is determined based on the current battery charge, rather than a simple engine start-stop control strategy. This belongs to basic logic control and can more effectively reduce the energy consumption of hybrid vehicles in low-speed creep conditions.

[0110] Based on the control method of the hybrid vehicle provided by the embodiment of the present invention, the embodiment of the present invention accordingly provides a control device for a hybrid vehicle, such as Figure 9 As shown, the control device of the hybrid vehicle is applicable to a vehicle including a single-motor hybrid system. The device:

[0111] The operation information acquisition unit 91 is used to obtain the operation information of the vehicle in real time when the vehicle is powered on at high voltage;

[0112] A battery power acquisition unit 92 is used to acquire the current battery power of the vehicle's motor if the operating information meets the preset low-speed creep condition;

[0113] A first determining unit 93 is configured to determine a target vehicle control scheme that matches the battery power level from among various pre-set vehicle control schemes;

[0114] The first control unit 94 is used to control the vehicle driving based on the target vehicle control scheme to achieve low-speed creeping of the vehicle.

[0115] The present invention provides a control device for a hybrid vehicle. During high-voltage power-on operation of the vehicle, the device can obtain vehicle operating information and, when the operating information satisfies a preset low-speed creep condition (i.e., when the vehicle is determined to be in a low-speed creep operating condition), obtain the current battery charge level of the vehicle's motor. This allows the device to determine a target vehicle control scheme that matches the battery charge level from among various pre-set vehicle control schemes. Finally, the device controls vehicle travel based on the target vehicle control scheme to achieve low-speed creep. The technical solution provided by the present invention allows the device to reasonably select an appropriate vehicle control scheme based on the current battery charge level of the motor to control the vehicle to perform low-speed creep, thereby reducing the hybrid vehicle's energy consumption in low-speed creep operating conditions.

[0116] Optionally, the operating information includes gear position and vehicle speed, and the control device of the hybrid vehicle further includes:

[0117] a first determining unit, configured to determine whether the vehicle speed is within a preset creeping speed range, or whether the gear position is a preset gear position and the vehicle speed is a preset speed;

[0118] a second determining unit, configured to determine that the operating information satisfies a preset low-speed creeping condition if the vehicle speed is within a preset creeping speed range, or if the gear is at a target gear and the vehicle speed is at a preset speed;

[0119] The second determination unit is used to determine that the operating information does not meet the preset low-speed creeping condition if the vehicle speed is not within the preset creeping speed range, and / or the gear is not the target gear, and / or the vehicle speed is not the preset speed.

[0120] Optionally, the first determining unit includes:

[0121] a second judging unit, configured to judge whether the battery power level is greater than a first power level threshold;

[0122] a fourth determining unit, configured to determine a first vehicle control scheme among the preset vehicle control schemes as a target vehicle control scheme if the battery power level is greater than a first power threshold;

[0123] a fifth determining unit, configured to determine a second vehicle control scheme among the preset vehicle control schemes as a target vehicle control scheme if the battery power level is less than or equal to the first power threshold and the battery power level is greater than the second power threshold;

[0124] a sixth determining unit, configured to determine a third vehicle control scheme among the preset vehicle control schemes as a target vehicle control scheme if the battery power is less than the second power threshold and the battery power is greater than or equal to the third power threshold;

[0125] The seventh determining unit is configured to determine a fourth vehicle control scheme among the preset vehicle control schemes as a target vehicle control scheme if the battery power level is less than a third power threshold.

[0126] Optionally, if the target vehicle control scheme is the first vehicle control scheme, or the second vehicle control scheme, the first control unit includes:

[0127] The second control unit is used to obtain the current depth of the vehicle's accelerator pedal and determine the engine speed and engine torque based on the depth of the accelerator pedal; control the engine shutdown, open the torque converter, and control the motor to simulate the engine speed and engine torque to enable the vehicle to creep at low speed.

[0128] Optionally, if the target vehicle control scheme is the first vehicle control scheme, or the second vehicle control scheme, the first control unit includes:

[0129] The third control unit is used to obtain the current depth of the vehicle's accelerator pedal and determine the engine speed and engine torque based on the depth of the accelerator pedal; control the engine shutdown, set the working state of the torque converter to the target state, and control the motor to simulate the engine speed and engine torque to enable the vehicle to creep at a low speed in pure electric mode; wherein the target state is not the open state.

[0130] Optionally, if the target vehicle control scheme is the second vehicle control scheme, the first control unit includes:

[0131] The fourth control unit is used to obtain the current depth of the vehicle's accelerator pedal and determine the engine speed and engine torque based on the depth of the accelerator pedal; open the torque converter, control the engine start, and control the engine to maintain the target low torque to achieve the vehicle's P gear charging, or D gear creep discharge; and control the motor to simulate the engine speed and engine torque to enable the vehicle to creep at low speed.

[0132] Optionally, the target vehicle control scheme is a third vehicle control scheme, and the first control unit includes:

[0133] The sixth control unit is used to obtain the current depth of the vehicle's accelerator pedal and determine the engine speed and engine torque based on the depth of the accelerator pedal; open the torque converter, control the engine start, and adjust the engine torque and engine speed based on the engine torque and engine speed; and control the motor to maintain the target low torque to achieve low-speed creeping of the vehicle, and to enable the motor to charge when the vehicle is creeping at low speed.

[0134] An embodiment of the present invention provides a vehicle, which includes the single-motor hybrid system and hybrid vehicle control device in the above embodiment.

[0135] Each embodiment in this specification is described in a progressive manner. The same or similar parts between the embodiments can be referred to each other. Each embodiment focuses on the differences from other embodiments. In particular, for system or system embodiments, since they are basically similar to method embodiments, the description is relatively simple. For relevant parts, refer to the partial description of the method embodiment. The system and system embodiments described above are merely schematic. The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the modules can be selected according to actual needs to achieve the purpose of the solution of this embodiment. A person of ordinary skill in the art can understand and implement it without making any creative efforts.

[0136] Professionals may further appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, computer software, or a combination of the two. In order to clearly illustrate the interchangeability of hardware and software, the above description has generally described the components and steps of each example according to their functions. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professionals and technicians may use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of the present invention.

[0137] The above description of the disclosed embodiments is intended to enable one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be readily apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not limited to the embodiments shown herein but is intended to conform to the widest scope consistent with the principles and novel features disclosed herein.

[0138] The above are only preferred embodiments of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A control method for a hybrid vehicle, characterized in that: Applicable to a vehicle including a single-motor hybrid system, the method includes: During the high-voltage power-on operation of the vehicle, the vehicle's operating information can be obtained in real time; If the operating information satisfies a preset low-speed creep condition, obtaining a current battery charge of a motor of the vehicle; Determining a target vehicle control scheme that matches the battery power from various pre-set vehicle control schemes; Controlling the vehicle to travel based on the target vehicle control scheme to achieve low-speed creeping of the vehicle; The step of determining a target vehicle control scheme that matches the battery power level from among various pre-set vehicle control schemes includes: Determining whether the battery power is greater than a first power threshold; If the battery power is greater than the first power threshold, determining a first vehicle control scheme among various pre-set vehicle control schemes as a target vehicle control scheme; If the battery power is less than or equal to the first power threshold and the battery power is greater than a second power threshold, determining the second vehicle control scheme among the preset vehicle control schemes as the target vehicle control scheme; If the battery power is less than the second power threshold and the battery power is greater than or equal to a third power threshold, determining a third vehicle control scheme among the preset vehicle control schemes as a target vehicle control scheme; If the battery power is less than the third power threshold, a fourth vehicle control scheme among the preset vehicle control schemes is determined as the target vehicle control scheme.

2. The method according to claim 1, characterized in that The operating information includes gear position and vehicle speed, and the method further includes: determining whether the vehicle speed is within a preset creeping speed range, or whether the gear position is a preset gear position and the vehicle speed is a preset speed; If the vehicle speed is within the preset creeping speed range, or the gear is the target gear and the vehicle speed is the preset speed, determining that the operating information satisfies a preset low-speed creeping condition; If the vehicle speed is not within the preset creeping speed range, and / or the gear is not the target gear, and / or the vehicle speed is not the preset speed, it is determined that the operating information does not meet the preset low-speed creeping condition.

3. The method according to claim 1, characterized in that The single-motor hybrid system includes at least a torque converter. If the target vehicle control scheme is the first vehicle control scheme or the second vehicle control scheme, controlling the vehicle to achieve low-speed creeping based on the target vehicle control scheme includes: Obtaining the current depth of the vehicle's accelerator pedal, and determining the engine speed and engine torque based on the depth of the accelerator pedal; The engine is stopped, the torque converter is opened, and the motor is controlled to simulate the engine speed and engine torque, so as to enable the vehicle to creep at a low speed.

4. The method according to claim 1, wherein If the target vehicle control scheme is the first vehicle control scheme or the second vehicle control scheme, controlling the vehicle to travel based on the target vehicle control scheme to achieve low-speed creeping of the vehicle includes: Obtaining the current depth of the vehicle's accelerator pedal, and determining the engine speed and engine torque based on the depth of the accelerator pedal; The engine is controlled to stop, the working state of the torque converter is set to a target state, and the motor is controlled to simulate the engine speed and engine torque to enable the vehicle to creep at a low speed in a pure electric mode; wherein the target state is not an open state.

5. The method according to claim 1, characterized in that If the target vehicle control scheme is the second vehicle control scheme, controlling the vehicle to travel based on the target vehicle control scheme to achieve low-speed creeping of the vehicle includes: Obtaining the current depth of the vehicle's accelerator pedal, and determining the engine speed and engine torque based on the depth of the accelerator pedal; Opening the torque converter, controlling the engine to start, and controlling the engine to maintain a target low torque to achieve charging in the P gear or creeping discharge in the D gear of the vehicle; The motor is controlled to simulate the engine speed and engine torque to enable the vehicle to creep at a low speed.

6. The method according to claim 1, characterized in that If the target vehicle control scheme is the third vehicle control scheme, controlling the vehicle to travel based on the target vehicle control scheme to achieve low-speed creeping of the vehicle includes: Obtaining the current depth of the vehicle's accelerator pedal, and determining the engine speed and engine torque based on the depth of the accelerator pedal; opening a torque converter, controlling the engine to start, and adjusting the torque and speed of the engine according to the engine torque and engine speed; The motor is controlled to maintain a target low torque to achieve low-speed creeping of the vehicle, and the motor is charged when the vehicle is creeping at low speed.

7. The method according to claim 1, characterized in that If the target vehicle control scheme is the fourth vehicle control scheme, controlling the vehicle to travel based on the target vehicle control scheme to achieve low-speed creeping of the vehicle includes: Obtaining the current depth of the vehicle's accelerator pedal, and determining the engine speed and engine torque based on the depth of the accelerator pedal; opening a torque converter, controlling the engine to start, and adjusting the torque and speed of the engine according to the engine torque and engine speed; The motor is controlled to maintain a target high torque to achieve low-speed creeping of the vehicle, and the motor is charged when the vehicle is creeping at low speed.

8. A control device for a hybrid vehicle, characterized in that: Applicable to a vehicle including a single-motor hybrid system, the device comprises: An operation information acquisition unit is used to acquire the vehicle's operation information in real time when the vehicle is in high-voltage power-on operation; a battery power acquisition unit, configured to acquire the current battery power of the vehicle's motor if the operating information satisfies a preset low-speed creep condition; a first determining unit, configured to determine a target vehicle control scheme that matches the battery power level from various preset vehicle control schemes; a control unit, configured to control the vehicle to travel based on the target vehicle control scheme, so as to enable the vehicle to perform low-speed creeping; The first determining unit includes: a second judging unit, configured to judge whether the battery power level is greater than a first power threshold; a fourth determining unit, configured to determine a first vehicle control scheme among the preset vehicle control schemes as a target vehicle control scheme if the battery power level is greater than the first power threshold; a fifth determining unit, configured to determine a second vehicle control scheme among the preset vehicle control schemes as a target vehicle control scheme if the battery power level is less than or equal to the first power threshold and the battery power level is greater than a second power threshold; a sixth determining unit, configured to determine a third vehicle control scheme among the preset vehicle control schemes as a target vehicle control scheme if the battery power level is less than the second power threshold and the battery power level is greater than or equal to a third power threshold; The seventh determining unit is configured to determine a fourth vehicle control scheme among the preset vehicle control schemes as a target vehicle control scheme if the battery power level is less than the third power threshold.

9. A vehicle, characterized in that: A hybrid vehicle control device comprising the control device of claim 8.

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