A control method and control system for braking energy recovery and auxiliary drive

Abstract

The present application discloses a control method and a control system for braking energy recovery and auxiliary drive, which can, while determining the running state of the whole vehicle, combine the semi-trailer information to control the power part of the semi-trailer for auxiliary drive and / or braking energy recovery. The auxiliary drive can improve the engine working conditions of the power part of the tractor, and the braking energy recovery can achieve energy conservation and emission reduction. The control method includes: obtaining the whole vehicle information and engine information of the power part of the tractor, and the semi-trailer information of the power part of the semi-trailer; determining the running state of the whole vehicle according to the whole vehicle information and the engine information; and controlling the power part of the semi-trailer for auxiliary drive and / or braking energy recovery according to the running state of the whole vehicle and the semi-trailer information.

Description

Technical Field

[0001] The present invention relates to the field of new energy vehicles, and particularly to a control method and a control system for braking energy recovery and auxiliary drive. Background Art

[0002] In the Chinese new energy vehicle market, it is basically new energy passenger cars and buses, and there are few new energy heavy trucks. However, for heavy truck manufacturers, on the one hand, they have to cope with increasingly strict environmental protection requirements and continuously improve the emission upgrade of diesel vehicles. On the other hand, they also need to improve the fuel-saving effect of the engine and reduce operating costs.

[0003] For heavy truck models such as semi-trailers, the curb weight basically reaches more than 20 tons, and the fuel consumption per 100 kilometers is approximately around 40L. Therefore, there is a large fuel-saving space. Under the influence of the overall market, the development of domestic pure electric heavy trucks is very rapid. For example, Shaanxi Automobile, Dongfeng, FAW Jiefang, United Truck, Sinotruk, etc. have all started to layout the research and development of pure electric new energy models for heavy trucks. However, at present, there are more pure electric new energy heavy trucks in China. According to the terminal data of compulsory traffic insurance, in 2019, the annual market sales volume of new energy heavy trucks increased by 665.35% year-on-year, all of which were pure electric heavy trucks, mainly dump trucks. However, hybrid heavy trucks are basically in the concept vehicle stage or the stage of being announced, and there are very few truly commercially available in the market. Abroad, hybrid heavy trucks have basically not reached the stage of commercial application in the market. However, pure electric heavy trucks also have many disadvantages, which affect the market promotion and use. The main disadvantages are as follows:

[0004] 1) The on-vehicle battery energy of pure electric heavy trucks is insufficient, resulting in a short driving range.

[0005] 2) Since more batteries need to be assembled, the initial investment cost of the system is too high.

[0006] 3) Large-capacity batteries cause electric trucks to generally be 3-4 tons heavier than the same type of diesel trucks.

[0007] 4) Pure electric heavy trucks charge slowly, generally taking 1.5 to 3 hours, which has a certain impact on engineering use.

[0008] To solve the above problems, especially the cost problems related to motors, electronic controls, batteries, etc., it is necessary to improve the engine working conditions and achieve the function of braking energy recovery through a low-cost new energy device on the basis of traditional semi-trailers, so as to achieve the purpose of energy conservation and emission reduction. Summary of the Invention

[0009] The object of the present invention is to provide a control method and a control system for braking energy recovery and auxiliary drive, which can, while determining the running state of the whole vehicle, combine the information of the semi-trailer and control the power part of the semi-trailer to perform auxiliary drive and / or braking energy recovery. The auxiliary drive can improve the engine working condition of the power part of the tractor, and the braking energy recovery can achieve energy conservation and emission reduction.

[0010] In the first aspect of the present invention, a control method for braking energy recovery and auxiliary drive is provided, which is applied to a semi-trailer vehicle. The semi-trailer vehicle includes a power part of the tractor and a power part of the semi-trailer. The method includes:

[0011] Obtain the vehicle information and engine information of the power part of the tractor, and the semi-trailer information of the power part of the semi-trailer;

[0012] Determine the running state of the whole vehicle according to the vehicle information and the engine information;

[0013] Control the power part of the semi-trailer to perform auxiliary drive and / or braking energy recovery according to the running state of the whole vehicle and the semi-trailer information.

[0014] Furthermore, the power part of the tractor includes an engine, a brake, a shifter, a steering gear and a reverse switch, and the power part of the semi-trailer includes a battery unit, a motor unit and a brake management unit BMU manager.

[0015] Obtaining the vehicle information and engine information of the power part of the tractor, and the semi-trailer information of the power part of the semi-trailer includes:

[0016] The BMU manager monitors the engine, the brake, the shifter, the steering gear and the reverse switch to obtain the vehicle information and the engine information. The vehicle information includes at least one of brake information, shifter information, steering gear information and reverse switch information;

[0017] The BMU manager monitors the battery unit and the motor unit to obtain the semi-trailer information. The semi-trailer information includes battery information and motor information.

[0018] Furthermore, controlling the power part of the semi-trailer to perform auxiliary drive and / or braking energy recovery according to the running state of the whole vehicle and the semi-trailer information includes:

[0019] When the running state of the whole vehicle is the starting state, the BMU manager calculates the starting auxiliary drive torque value according to the preset vehicle demand and the battery information, controls the motor unit to output the starting auxiliary drive torque, and performs the starting auxiliary drive so that the engine is at the optimal operating point;

[0020] When the vehicle is in the forward running state and accelerating, the BMU manager calculates the passive auxiliary drive torque value based on the engine information, battery information, and engine operating point, and controls the motor unit to output the passive auxiliary drive torque for passive auxiliary drive.

[0021] When the vehicle is in the forward running state and moving at a constant speed, the BMU manager calculates the active auxiliary drive torque value and the active braking energy recovery torque value based on the engine information, battery information, and engine operating point, and controls the motor unit to output the active auxiliary drive torque and the active braking energy recovery torque for active auxiliary drive and active braking energy recovery, thereby adjusting the engine operating point and charging the battery unit.

[0022] When the vehicle is in the forward running state and braking, the BMU manager calculates the passive braking energy recovery power based on the brake information, battery information, and motor information, and controls the motor unit and the battery unit to perform passive braking energy recovery according to the passive braking energy recovery power.

[0023] Furthermore, the method further includes:

[0024] When the vehicle is in the forward running state and decelerating, in the parking state, or in the reverse state, the BMU manager controls the power part of the semi-trailer not to perform active / passive auxiliary drive and active / passive braking energy recovery.

[0025] Furthermore, the power part of the tractor includes an engine controller, an engine, a brake, a shifter, a steering gear, and a reverse switch, and the power part of the semi-trailer includes a battery unit, a motor unit, and a brake management unit BMU manager.

[0026] Obtain the vehicle information and engine information of the power part of the tractor, and the semi-trailer information of the power part of the semi-trailer, including:

[0027] The engine controller monitors the engine, brake, shifter, steering gear, and reverse switch to obtain the vehicle information and engine information. The vehicle information includes at least one of brake information, shifter information, steering gear information, and reverse switch information.

[0028] The engine controller monitors the battery unit and the motor unit through the BMU manager to obtain the semi-trailer information. The semi-trailer information includes battery information and motor information.

[0029] Furthermore, according to the vehicle running state and the semi-trailer information, controlling the power part of the semi-trailer to perform auxiliary drive and / or braking energy recovery includes:

[0030] When the running state of the whole vehicle is the starting state, the engine controller calculates the starting auxiliary driving torque value according to the preset vehicle requirements and battery information, and sends the starting auxiliary driving torque value to the BMU manager, so that the BMU manager controls the motor unit to output the starting auxiliary driving torque for starting auxiliary driving, making the engine operate at the optimal working point;

[0031] When the running state of the whole vehicle is the forward state and accelerating, the engine controller calculates the passive auxiliary driving torque value according to the engine information, battery information and engine working point, and sends the passive auxiliary driving torque value to the BMU manager, so that the BMU manager controls the motor unit to output the passive auxiliary driving torque for passive auxiliary driving;

[0032] When the running state of the whole vehicle is the forward state and cruising, the engine controller calculates the active auxiliary driving torque value and the active braking energy recovery torque value according to the engine information, battery information and engine working point, and sends the active auxiliary driving torque value and the active braking energy recovery torque value to the BMU manager, so that the BMU manager controls the motor unit to output the active auxiliary driving torque and the active braking energy recovery torque for active auxiliary driving and active braking energy recovery, thereby adjusting the engine working point and charging the battery unit;

[0033] When the running state of the whole vehicle is the forward state and braking, the engine controller calculates the passive braking energy recovery power according to the brake information, battery information and motor information, and sends the passive braking energy recovery power to the BMU manager, so that the BMU manager controls the motor unit and the battery unit to perform passive braking energy recovery according to the passive braking energy recovery power.

[0034] Furthermore, the method further includes:

[0035] When the running state of the whole vehicle is the forward state and decelerating, parking or reversing, the engine controller controls the power part of the semi-trailer not to perform active / passive auxiliary driving and active / passive braking energy recovery.

[0036] The second aspect of the present invention provides a control system for braking energy recovery and auxiliary driving, which is applied to a semi-trailer vehicle. The semi-trailer vehicle includes a power part of the tractor and a power part of the semi-trailer, and includes:

[0037] A braking energy recovery and auxiliary driving manager, which is used to obtain the vehicle information and engine information of the power part of the tractor, and the semi-trailer information of the power part of the semi-trailer, determine the running state of the whole vehicle according to the vehicle information and engine information, and control the power part of the semi-trailer to perform auxiliary driving and / or braking energy recovery according to the running state and semi-trailer information.

[0038] Further, the power part of the tractor includes an engine, a brake, a shifter, a steering gear, and a reverse switch. The power part of the semi-trailer includes a battery unit, a motor unit, and a brake management unit (BMU manager). The brake energy recovery and auxiliary drive manager is the BMU manager;

[0039] The BMU manager is used to monitor the engine, the brake, the shifter, the steering gear, and the reverse switch to obtain vehicle information and engine information. The vehicle information includes at least one of brake information, shifter information, steering gear information, and reverse switch information;

[0040] The BMU manager is also used to monitor the battery unit and the motor unit to obtain semi-trailer information. The semi-trailer information includes battery information and motor information;

[0041] The BMU manager is also used to, when the vehicle running state is the starting state, calculate a starting auxiliary drive torque value according to a preset vehicle demand and battery information, control the motor unit to output the starting auxiliary drive torque, and perform starting auxiliary drive so that the engine is at an optimal operating point;

[0042] The BMU manager is also used to, when the vehicle running state is the forward state and accelerating, calculate a passive auxiliary drive torque value according to the engine information, battery information, and engine operating point, control the motor unit to output the passive auxiliary drive torque, and perform passive auxiliary drive;

[0043] The BMU manager is also used to, when the vehicle running state is the forward state and cruising, calculate an active auxiliary drive torque value and an active brake energy recovery torque value according to the engine information, battery information, and engine operating point, control the motor unit to output the active auxiliary drive torque and the active brake energy recovery torque, and perform active auxiliary drive and active brake energy recovery, thereby adjusting the engine operating point and charging the battery unit;

[0044] The BMU manager is also used to, when the vehicle running state is the forward state and braking, calculate a passive brake energy recovery power according to the brake information, battery information, and motor information, and control the motor unit and the battery unit to perform passive brake energy recovery according to the passive brake energy recovery power.

[0045] The BMU manager is also used to, when the vehicle running state is the forward state and decelerating, parking, or reversing, control the power part of the semi-trailer not to perform active / passive auxiliary drive and active / passive brake energy recovery.

[0046] Further, the power part of the tractor includes an engine controller, an engine, a brake, a shifter, a steering gear, and a reverse switch. The power part of the semi-trailer includes a battery unit, a motor unit, and a brake management unit (BMU) manager. The brake energy recovery and auxiliary drive manager is the engine controller;

[0047] The engine controller is used to monitor the engine, the brake, the shifter, the steering gear, and the reverse switch to obtain vehicle information and engine information. The vehicle information includes at least one of brake information, shifter information, steering gear information, and reverse switch information;

[0048] The engine controller is further used to monitor the battery unit and the motor unit through the BMU manager to obtain semi-trailer information. The semi-trailer information includes battery information and motor information;

[0049] The engine controller is further used to, when the vehicle running state is the starting state, calculate a starting auxiliary drive torque value according to a preset vehicle demand and battery information, and send the starting auxiliary drive torque value to the BMU manager, so that the BMU manager controls the motor unit to output the starting auxiliary drive torque for starting auxiliary drive, and makes the engine operate at an optimal operating point;

[0050] The engine controller is further used to, when the vehicle running state is the forward state and accelerating, calculate a passive auxiliary drive torque value according to the engine information, the battery information, and the engine operating point, and send the passive auxiliary drive torque value to the BMU manager, so that the BMU manager controls the motor unit to output the passive auxiliary drive torque for passive auxiliary drive;

[0051] The engine controller is further used to, when the vehicle running state is the forward state and cruising, calculate an active auxiliary drive torque value and an active brake energy recovery torque value according to the engine information, the battery information, and the engine operating point, and send the active auxiliary drive torque value and the active brake energy recovery torque value to the BMU manager, so that the BMU manager controls the motor unit to output the active auxiliary drive torque and the active brake energy recovery torque for active auxiliary drive and active brake energy recovery, thereby adjusting the engine operating point and charging the battery unit;

[0052] The engine controller is further used to, when the vehicle running state is the forward state and braking, calculate a passive brake energy recovery power according to the brake information, the battery information, and the motor information, and send the passive brake energy recovery power to the BMU manager, so that the BMU manager controls the motor unit and the battery unit to perform passive brake energy recovery according to the passive brake energy recovery power;

[0053] The engine controller is also used to control the power part of the semi-trailer not to perform active / passive auxiliary driving and active / passive braking energy recovery when the running state of the whole vehicle is in the forward state and decelerating, parking or reversing state.

[0054] It can be seen that the present invention is applied to a semi-trailer vehicle having a power part of a tractor and a power part of a semi-trailer, obtains the vehicle information and engine information of the power part of the tractor, and the semi-trailer information of the power part of the semi-trailer, determines the running state of the whole vehicle according to the vehicle information and engine information, and controls the power part of the semi-trailer to perform auxiliary driving and / or braking energy recovery according to the running state of the whole vehicle and the semi-trailer information. Compared with the existing pure electric semi-trailer vehicle, it can, while determining the running state of the whole vehicle, combine the semi-trailer information to control the power part of the semi-trailer to perform auxiliary driving and / or braking energy recovery. The auxiliary driving can improve the engine working condition of the power part of the tractor, and the braking energy recovery can achieve energy conservation and emission reduction. BRIEF DESCRIPTION OF THE DRAWINGS

[0055] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments recorded in the present application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained according to these drawings.

[0056] Figure 1 It is a schematic flow chart of an embodiment of the control method for braking energy recovery and auxiliary driving provided by the present invention;

[0057] Figure 2 It is a schematic flow chart of another embodiment of the control method for braking energy recovery and auxiliary driving provided by the present invention;

[0058] Figure 3 It is a schematic flow chart of still another embodiment of the control method for braking energy recovery and auxiliary driving provided by the present invention;

[0059] Figure 4 It is a schematic structural diagram of an embodiment of the control system for braking energy recovery and auxiliary driving provided by the present invention;

[0060] Figure 5 It is a schematic structural diagram of another embodiment of the control system for braking energy recovery and auxiliary driving provided by the present invention;

[0061] Figure 6 It is a schematic structural diagram of still another embodiment of the control system for braking energy recovery and auxiliary driving provided by the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0062] The present application discloses a control method and a control system for braking energy recovery and auxiliary drive, which can, while determining the running state of the whole vehicle, combine the information of the semi-trailer to control the power part of the semi-trailer for auxiliary drive and / or braking energy recovery. The auxiliary drive can improve the engine working condition of the power part of the tractor, and the braking energy recovery can achieve energy conservation and emission reduction.

[0063] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts belong to the scope of protection of the present invention.

[0064] It should be noted that all directional indications (such as up, down, left, right, front, back...) in the embodiments of the present invention are only used to explain the relative position relationship and movement conditions between components in a specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indications will also change accordingly.

[0065] In addition, the descriptions such as "first" and "second" in the present invention are only for descriptive purposes, and cannot be understood as indicating or implying their relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0066] In the present invention, unless otherwise clearly defined and limited, the terms "connection", "fixation", etc. should be understood in a broad sense. For example, "fixation" may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and may be the internal connection of two components or the interaction relationship between two components, unless otherwise clearly limited. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0067] In addition, the technical solutions between the various embodiments of the present invention can be combined with each other, but it must be based on the ability of those of ordinary skill in the art to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0068] Please refer to Figure 1 , the embodiments of the present invention provide a control method for braking energy recovery and auxiliary drive, including:

[0069] 101. Obtain the vehicle information and engine information of the power part of the tractor, and the semi-trailer information of the power part of the semi-trailer.

[0070] In this embodiment, the semi-trailer vehicle is composed of a tractor part and a semi-trailer part. The tractor part has a power part of the tractor, and the semi-trailer part has a power part of the semi-trailer. The engine is installed in the power part of the tractor. Then, by monitoring each device and the engine in the power part of the tractor, the vehicle information and engine information of the power part of the tractor can be obtained, and the semi-trailer information can be obtained by monitoring each device in the power part of the semi-trailer.

[0071] 102. Determine the vehicle running state according to the vehicle information and engine information.

[0072] In this embodiment, the vehicle information affects the operation of the semi-trailer vehicle. Then, by combining the vehicle information and engine information, the vehicle running state can be determined. Specifically, the vehicle information can be the signals of the brake, shifter, steering gear, and reverse switch. There can be various vehicle running states, such as starting state, forward state accelerating, forward state driving at a constant speed, forward state braking, forward state decelerating, parking state, or reverse state, etc.

[0073] 103. Control the power part of the semi-trailer to perform auxiliary driving and / or braking energy recovery according to the vehicle running state and semi-trailer information.

[0074] In this embodiment, for different vehicle running states, since the power part of the tractor provides the main traction, if the power part of the semi-trailer can provide auxiliary driving, the engine working condition can be improved. And since the power part of the semi-trailer uses electric energy, braking energy can also be recovered to achieve the purpose of saving electric energy. Therefore, according to different vehicle running states and semi-trailer information, the power part of the semi-trailer can be controlled to perform auxiliary driving and / or braking energy recovery.

[0075] In the embodiment of the present invention, in a semi-trailer vehicle having a power part of the tractor and a power part of the semi-trailer, obtain the vehicle information and engine information of the power part of the tractor, and the semi-trailer information of the power part of the semi-trailer. Determine the vehicle running state according to the vehicle information and engine information, and control the power part of the semi-trailer to perform auxiliary driving and / or braking energy recovery according to the vehicle running state and semi-trailer information. Compared with the existing pure electric semi-trailer vehicle, it can, while determining the vehicle running state, combine the semi-trailer information to control the power part of the semi-trailer to perform auxiliary driving and / or braking energy recovery. The auxiliary driving can improve the engine working condition of the power part of the tractor, and the braking energy recovery can achieve energy conservation and emission reduction.

[0076] In the aboveFigure 1 In the illustrated embodiment, the main body for braking energy recovery and auxiliary drive is not specified in which power part of the semi-trailer vehicle. Specifically, it can be controlled by the power part of the semi-trailer or by the power part of the tractor. The following will be described in detail through embodiments.

[0077] (1). The power part of the semi-trailer serves as the main control for braking energy recovery and auxiliary drive;

[0078] Please refer to Figure 2 , an embodiment of the present invention provides a control method for braking energy recovery and auxiliary drive, including:

[0079] 201. The BMU manager monitors the engine, brake, shifter, steering gear, and reverse switch to obtain vehicle information and engine information. The vehicle information includes at least one of brake information, shifter information, steering gear information, and reverse switch information;

[0080] In this embodiment, the power part of the tractor includes an engine, a brake, a shifter, a steering gear, and a reverse switch. The power part of the semi-trailer includes a battery unit, a motor unit, and a Brake Management Unit (BMU) manager. The BMU manager monitors each device to obtain vehicle information and engine information. The vehicle information includes at least one of brake information, shifter information, steering gear information, and reverse switch information. It should be noted that the battery unit can specifically be a power battery, the motor unit specifically includes a motor controller, a motor, etc. The power part of the semi-trailer can also include a display, a cooling system, a mode switch, etc.

[0081] 202. The BMU manager monitors the battery unit and the motor unit to obtain semi-trailer information. The semi-trailer information includes battery information and motor information;

[0082] In this embodiment, the BMU manager monitors the battery unit and the motor unit to obtain semi-trailer information. The semi-trailer information includes battery information and motor information.

[0083] 203. The BMU manager determines the vehicle running state according to the vehicle information and the engine information;

[0084] In this embodiment, through the brake information, shifter information, steering gear information, and reverse switch information in the overall information, and combined with the engine information, it is possible to determine whether the vehicle running state is a starting state, an accelerating state while moving forward, a constant-speed state while moving forward, a braking state while moving forward, a decelerating state while moving forward, a parking state, or a reverse state.

[0085] 204. When the running state of the whole vehicle is the starting state, the BMU manager calculates the starting auxiliary driving torque value according to the preset whole-vehicle requirements and battery information, controls the motor unit to output the starting auxiliary driving torque, and performs starting auxiliary driving, so that the engine is at the optimal operating point;

[0086] In this embodiment, when the running state of the whole vehicle is the starting state, the BMU manager calculates the starting auxiliary driving torque value according to the preset whole-vehicle requirements and battery information. The preset whole-vehicle requirements are set according to the requirements of the whole-vehicle power performance and economic performance. The battery information is specifically the temperature and state of charge (SOC) of the power battery. The motor unit is controlled to output the starting auxiliary driving torque according to the starting auxiliary driving torque value, and performs starting auxiliary driving, so that the engine is at the optimal operating point.

[0087] 205. When the running state of the whole vehicle is the forward state and it is accelerating, the BMU manager calculates the passive auxiliary driving torque value according to the engine information, battery information and engine operating point, controls the motor unit to output the passive auxiliary driving torque, and performs passive auxiliary driving;

[0088] In this embodiment, when the running state of the whole vehicle is the forward state and it is accelerating, the passive auxiliary driving torque value is calculated according to the engine information, battery information and engine operating point. The engine information can specifically be the throttle, torque, speed, etc., and the battery information can specifically be the SOC. The motor unit is controlled to output the passive auxiliary driving torque according to the passive auxiliary driving torque value, and performs passive auxiliary driving.

[0089] 206. When the running state of the whole vehicle is the forward state and it is traveling at a constant speed, the BMU manager calculates the active auxiliary driving torque value and the active braking energy recovery torque value according to the engine information, battery information and engine operating point, controls the motor unit to output the active auxiliary driving torque and the active braking energy recovery torque, and performs active auxiliary driving and active braking energy recovery, so as to adjust the engine operating point and charge the battery unit;

[0090] In this embodiment, when the running state of the whole vehicle is the forward state and it is traveling at a constant speed, the BMU manager calculates the active auxiliary driving torque value and the active braking energy recovery torque value according to the engine information, battery information and engine operating point. The engine information can specifically be the throttle, torque, speed, etc., and the battery information can specifically be the SOC. The motor unit is controlled to output the active auxiliary driving torque according to the active auxiliary driving torque value, and performs active auxiliary driving, and controls the motor unit to perform active braking energy recovery according to the active braking energy recovery torque value, so as to adjust the engine operating point and charge the battery unit.

[0091] 207. When the running state of the whole vehicle is in the forward state and braking is in progress, the BMU manager calculates the passive braking energy recovery power based on the brake information, battery information, and motor information, and controls the motor unit and battery unit to perform passive braking energy recovery according to the passive braking energy recovery power.

[0092] In this embodiment, when the running state of the whole vehicle is in the forward state and braking is in progress, the BMU manager calculates the passive braking energy recovery power based on the brake information, battery information, and motor information. The brake information specifically includes information such as the brake pedal, wheel cylinder pressure, and vehicle speed. The battery information specifically includes information such as SOC, temperature, and electronic control. The motor information specifically includes information such as the motor speed. The motor unit and battery unit are controlled to perform passive braking energy recovery according to the passive braking energy recovery power.

[0093] 208. When the running state of the whole vehicle is in the forward state and decelerating, parking state, or reverse state, the BMU manager controls the power part of the semi-trailer not to perform active / passive auxiliary driving and active / passive braking energy recovery.

[0094] In this embodiment, when the running state of the whole vehicle is in the forward state and decelerating, parking state, or reverse state, the BMU manager controls the power part of the semi-trailer not to perform active / passive auxiliary driving and active / passive braking energy recovery.

[0095] (2). The power part of the tractor is the main controller for braking energy recovery and auxiliary driving.

[0096] Please refer to Figure 3 , an embodiment of the present invention provides a control method for braking energy recovery and auxiliary driving, including:

[0097] 301. The engine controller monitors the engine, brakes, shifter, steering gear, and reverse switch to obtain the vehicle information and engine information. The vehicle information includes at least one of brake information, shifter information, steering gear information, and reverse switch information.

[0098] In this embodiment, the power part of the tractor includes an engine, brakes, shifter, steering gear, and reverse switch. The power part of the semi-trailer includes a battery unit, a motor unit, and a BMU manager. The engine controller monitors each device to obtain the vehicle information and engine information. The vehicle information includes at least one of brake information, shifter information, steering gear information, and reverse switch information. It should be noted that the battery unit may specifically be a power battery, the motor unit specifically includes a motor controller, a motor, etc. The power part of the semi-trailer may also include a display, a cooling system, a mode switch, etc.

[0099] 302. The engine controller monitors the battery unit and the motor unit through the BMU manager to obtain semi-trailer information, where the semi-trailer information includes battery information and motor information.

[0100] In this embodiment, the engine controller monitors the battery unit and the motor unit through the BMU manager to obtain semi-trailer information, where the semi-trailer information includes battery information and motor information.

[0101] 303. The engine controller determines the running state of the whole vehicle according to the vehicle information and the engine information.

[0102] In this embodiment, the engine controller can judge whether the running state of the whole vehicle is the starting state, the forward accelerating state, the forward constant-speed state, the forward braking state, the forward decelerating state, the parking state or the reverse state by means of the brake information, the shifter information, the steering gear information and the reverse switch information in the overall information, and in combination with the engine information.

[0103] 304. When the running state of the whole vehicle is the starting state, the engine controller calculates the starting auxiliary drive torque value according to the preset vehicle requirements and the battery information, and sends the starting auxiliary drive torque value to the BMU manager, so that the BMU manager controls the motor unit to output the starting auxiliary drive torque for starting auxiliary drive, making the engine operate at the optimal working point.

[0104] In this embodiment, when the running state of the whole vehicle is the starting state, the engine controller calculates the starting auxiliary drive torque value according to the preset vehicle requirements and the battery information. The preset vehicle requirements are set according to the requirements of the vehicle's dynamic performance and economic performance, and the battery information specifically refers to the temperature and SOC of the power battery. The engine controller sends the starting auxiliary drive torque value to the BMU manager, so that the BMU manager controls the motor unit to output the starting auxiliary drive torque for starting auxiliary drive, making the engine operate at the optimal working point.

[0105] 305. When the running state of the whole vehicle is the forward state and accelerating, the engine controller calculates the passive auxiliary drive torque value according to the engine information, the battery information and the engine working point, and sends the passive auxiliary drive torque value to the BMU manager, so that the BMU manager controls the motor unit to output the passive auxiliary drive torque for passive auxiliary drive.

[0106] In this embodiment, when the vehicle is in a forward running state and accelerating, the engine controller calculates the passive auxiliary drive torque value according to the engine information, battery information, and engine operating point. The engine information can specifically be throttle, torque, rotational speed, etc., and the battery information can specifically be SOC, and sends the passive auxiliary drive torque value to the BMU manager, so that the BMU manager controls the motor unit to output the passive auxiliary drive torque for passive auxiliary drive.

[0107] 306. When the vehicle is in a forward running state and moving at a constant speed, the engine controller calculates the active auxiliary drive torque value and the active braking energy recovery torque value according to the engine information, battery information, and engine operating point, and sends the active auxiliary drive torque value and the active braking energy recovery torque value to the BMU manager, so that the BMU manager controls the motor unit to output the active auxiliary drive torque and the active braking energy recovery torque for active auxiliary drive and active braking energy recovery, thereby adjusting the engine operating point and charging the battery unit.

[0108] In this embodiment, when the vehicle is in a forward running state and moving at a constant speed, the engine controller calculates the active auxiliary drive torque value and the active braking energy recovery torque value according to the engine information, battery information, and engine operating point. The engine information can specifically be throttle, torque, rotational speed, etc., and the battery information can specifically be SOC, and sends the active auxiliary drive torque value and the active braking energy recovery torque value to the BMU manager, so that the BMU manager controls the motor unit to output the active auxiliary drive torque and the active braking energy recovery torque for active auxiliary drive and active braking energy recovery, thereby adjusting the engine operating point and charging the battery unit.

[0109] 307. When the vehicle is in a forward running state and braking, the engine controller calculates the passive braking energy recovery power according to the brake information, battery information, and motor information, and sends the passive braking energy recovery power to the BMU manager, so that the BMU manager controls the motor unit and the battery unit to perform passive braking energy recovery according to the passive braking energy recovery power.

[0110] In this embodiment, when the vehicle is in a forward running state and braking, the engine controller calculates the passive braking energy recovery power according to the brake information, battery information, and motor information. The brake information specifically includes information such as the brake pedal, wheel cylinder pressure, vehicle speed, etc., the battery information specifically includes information such as SOC, temperature, electronic control, etc., and the motor information specifically includes information such as the motor rotational speed, etc. The passive braking energy recovery power is sent to the BMU manager, so that the BMU manager controls the motor unit and the battery unit to perform passive braking energy recovery according to the passive braking energy recovery power.

[0111] 308. When the vehicle running state is in the forward state and decelerating, parking or reversing, the engine controller controls the power part of the semi-trailer not to perform active / passive auxiliary drive and active / passive braking energy recovery.

[0112] In this embodiment, when the vehicle running state is in the forward state and decelerating, parking or reversing, the engine controller controls the power part of the semi-trailer not to perform active / passive auxiliary drive and active / passive braking energy recovery.

[0113] Please refer to Figure 4 , an embodiment of the present invention provides a control system for braking energy recovery and auxiliary drive, which is applied to a semi-trailer vehicle 400. The semi-trailer vehicle 400 includes a tractor power part 401 and a semi-trailer power part 402, and includes:

[0114] A braking energy recovery and auxiliary drive manager 403, configured to obtain the vehicle information and engine information of the tractor power part 401, and the semi-trailer information of the semi-trailer power part 402, determine the vehicle running state according to the vehicle information and engine information, and control the semi-trailer power part 402 to perform auxiliary drive and / or braking energy recovery according to the vehicle running state and the semi-trailer information.

[0115] In the embodiment of the present invention, in the semi-trailer vehicle 400 having a tractor power part 401 and a semi-trailer power part 402, the braking energy recovery and auxiliary drive manager 403 obtains the vehicle information and engine information of the tractor power part 401, and the semi-trailer information of the semi-trailer power part 402, determines the vehicle running state according to the vehicle information and engine information, and controls the semi-trailer power part 402 to perform auxiliary drive and / or braking energy recovery according to the vehicle running state and the semi-trailer information. Compared with the existing pure electric semi-trailer vehicle, it can, while determining the vehicle running state, combine the semi-trailer information to control the semi-trailer power part to perform auxiliary drive and / or braking energy recovery. The auxiliary drive can improve the engine working condition of the tractor power part, and the braking energy recovery can achieve energy conservation and emission reduction.

[0116] Combined with Figure 4 the embodiment shown, as Figure 5 shown, in some embodiments of the present invention, the tractor power part 401 includes an engine 501, a brake 502, a shifter 503, a steering gear 504 and a reverse switch 505, the semi-trailer power part 402 includes a battery unit 506, a motor unit 507 and a BMU manager 508, and the braking energy recovery and auxiliary drive manager is the BMU manager 508;

[0117] The BMU manager 508 is used to monitor the engine 501, the brake 502, the shifter 503, the steering gear 504, and the reverse switch 501 to obtain vehicle information and engine information. The vehicle information includes at least one of brake information, shifter information, steering gear information, and reverse switch information;

[0118] The BMU manager 508 is also used to monitor the battery unit 506 and the motor unit 507 to obtain semi-trailer information. The semi-trailer information includes battery information and motor information;

[0119] The BMU manager 508 is also used to, when the vehicle running state is the starting state, calculate a starting assist driving torque value according to a preset vehicle demand and battery information, control the motor unit 507 to output the starting assist driving torque, and perform starting assist driving so that the engine 501 is at an optimal operating point;

[0120] The BMU manager 508 is also used to, when the vehicle running state is the forward state and accelerating, calculate a passive assist driving torque value according to the engine information, battery information, and engine operating point, control the motor unit 507 to output the passive assist driving torque, and perform passive assist driving;

[0121] The BMU manager 508 is also used to, when the vehicle running state is the forward state and cruising, calculate an active assist driving torque value and an active braking energy recovery torque value according to the engine information, battery information, and engine operating point, control the motor unit 507 to output the active assist driving torque and the active braking energy recovery torque, and perform active assist driving and active braking energy recovery, so as to adjust the engine operating point and charge the battery unit 506;

[0122] The BMU manager 508 is also used to, when the vehicle running state is the forward state and braking, calculate a passive braking energy recovery power according to the brake information, battery information, and motor information, and control the motor unit 507 and the battery unit 506 to perform passive braking energy recovery according to the passive braking energy recovery power;

[0123] The BMU manager 508 is also used to, when the vehicle running state is the forward state and decelerating, parking, or reversing, control the power part of the semi-trailer not to perform active / passive assist driving and active / passive braking energy recovery.

[0124] It should be noted that in Figure 5 it also includes a motor controller 509, a display 510, a cooling system 511, and a mode switch 512.

[0125] Optionally, in combination with Figure 4 the embodiment shown in Figure 6As shown in the figure, in some embodiments of the present invention, the power part 401 of the tractor includes an engine controller 601, an engine 602, a brake 603, a shifter 604, a steering gear 605 and a reverse switch 606. The power part 402 of the semi-trailer includes a battery unit 607, a motor unit 608 and a BMU manager 609. The brake energy recovery and auxiliary drive manager is the engine controller 601;

[0126] The engine controller 601 is used to monitor the engine 602, the brake 603, the shifter 604, the steering gear 605 and the reverse switch 606 to obtain vehicle information and engine information. The vehicle information includes at least one of brake information, shifter information, steering gear information and reverse switch information;

[0127] The engine controller 601 is further used to monitor the battery unit 607 and the motor unit 608 through the BMU manager 609 to obtain semi-trailer information. The semi-trailer information includes battery information and motor information;

[0128] When the vehicle running state is the starting state, the engine controller 601 is further used to calculate a starting auxiliary drive torque value according to the preset vehicle requirements and battery information, and send the starting auxiliary drive torque value to the BMU manager 609, so that the BMU manager 609 controls the motor unit to output the starting auxiliary drive torque for starting auxiliary drive, and makes the engine operate at the optimal working point;

[0129] When the vehicle running state is the forward state and accelerating, the engine controller 601 is further used to calculate a passive auxiliary drive torque value according to the engine information, battery information and engine working point, and send the passive auxiliary drive torque value to the BMU manager 609, so that the BMU manager 609 controls the motor unit to output the passive auxiliary drive torque for passive auxiliary drive;

[0130] When the vehicle running state is the forward state and moving at a constant speed, the engine controller 601 is further used to calculate an active auxiliary drive torque value and an active brake energy recovery torque value according to the engine information, battery information and engine working point, and send the active auxiliary drive torque value and the active brake energy recovery torque value to the BMU manager 609, so that the BMU manager 609 controls the motor unit to output the active auxiliary drive torque and the active brake energy recovery torque for active auxiliary drive and active brake energy recovery, thereby adjusting the engine working point and charging the battery unit;

[0131] The engine controller 601 is further configured to calculate the passive braking energy recovery power based on the brake information, battery information, and motor information when the vehicle running state is in the forward state and braking, and send the passive braking energy recovery power to the BMU manager 609, so that the BMU manager 609 controls the motor unit 608 and the battery unit 607 to perform passive braking energy recovery according to the passive braking energy recovery power;

[0132] The engine controller 601 is further configured to control the power part of the semi-trailer not to perform active / passive auxiliary driving and active / passive braking energy recovery when the vehicle running state is in the forward state and decelerating, parking, or reversing.

[0133] It should be noted that Figure 6 also includes a motor controller 610, a display 611, a cooling system 612, and a mode switch 613.

[0134] The embodiments in this specification are described in a progressive manner. Each embodiment focuses on the differences from other embodiments. The same or similar parts among the embodiments can be referred to each other. For the devices disclosed in the embodiments, since they correspond to the methods disclosed in the embodiments, the description is relatively simple. For the relevant parts, reference can be made to the description of the method part.

[0135] It should also be noted that the term "including", "comprising", or any other variation thereof is intended to cover a non-exclusive inclusion, so that a process, method, article, or device including a series of elements not only includes those elements but also includes other elements not explicitly listed, or further includes elements inherent to such process, method, article, or device. Without further limitation, the element defined by the statement "including one..." does not exclude the existence of another identical element in the process, method, article, or device including the element.

[0136] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be obvious to those skilled in the art. The general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A control method for braking energy recovery and auxiliary drive, characterized in that, Applied to a semi-trailer vehicle, the semi-trailer vehicle including a tractor power part and a semi-trailer power part, the method includes: Obtain the vehicle information and engine information of the tractor power part, and the semi-trailer information of the semi-trailer power part; Determine the vehicle operating state according to the vehicle information and the engine information; The tractor power part includes an engine, a brake, a shifter, a steering gear and a reverse switch, and the semi-trailer power part includes a battery unit, a motor unit and a brake management unit BMU manager; The BMU manager monitors the engine, the brake, the shifter, the steering gear and the reverse switch to obtain vehicle information and engine information, and the vehicle information includes at least one of brake information, shifter information, steering gear information and reverse switch information; The BMU manager monitors the battery unit and the motor unit to obtain semi-trailer information, and the semi-trailer information includes battery information and motor information; The BMU manager controls the semi-trailer power part to perform auxiliary drive and / or brake energy recovery according to the vehicle operating state and the semi-trailer information; When the vehicle operating state is the starting state, the BMU manager calculates a starting auxiliary drive torque value according to a preset vehicle demand and the battery information, controls the motor unit to output a starting auxiliary drive torque, and performs starting auxiliary drive so that the engine is at an optimal operating point; When the vehicle operating state is the forward state and accelerating, the BMU manager calculates a passive auxiliary drive torque value according to the engine information, the battery information and the engine operating point, controls the motor unit to output a passive auxiliary drive torque, and performs passive auxiliary drive; When the vehicle operating state is the forward state and traveling at a constant speed, the BMU manager calculates an active auxiliary drive torque value and an active brake energy recovery torque value according to the engine information, the battery information and the engine operating point, controls the motor unit to output an active auxiliary drive torque and an active brake energy recovery torque, and performs active auxiliary drive and active brake energy recovery, thereby adjusting the engine operating point and charging the battery unit; When the vehicle operating state is the forward state and braking, the BMU manager calculates a passive brake energy recovery power according to the brake information, the battery information and the motor information, and controls the motor unit and the battery unit to perform passive brake energy recovery according to the passive brake energy recovery power.

2. The control method according to claim 1, characterized in that, The method further includes: When the vehicle operating state is the parking state or the reverse state, the BMU manager controls the semi-trailer power part not to perform active / passive auxiliary drive and active / passive brake energy recovery.

3. The control method according to claim 1, characterized in that, The tractor power part further includes an engine controller, and the obtaining of the vehicle information and engine information of the tractor power part, and the semi-trailer information of the semi-trailer power part includes: The engine controller monitors the engine, the brake, the shifter, the steering gear, and the reverse switch to obtain vehicle information and engine information. The vehicle information includes at least one of brake information, shifter information, steering gear information, and reverse switch information. The engine controller monitors the battery unit and the motor unit through the BMU manager to obtain semi-trailer information. The semi-trailer information includes battery information and motor information.

4. The control method according to claim 3, characterized in that, The BMU manager controls the auxiliary drive and / or braking energy recovery of the semi-trailer power part according to the vehicle running state and the semi-trailer information, including: When the vehicle running state is the starting state, the engine controller calculates the starting auxiliary drive torque value according to the preset vehicle demand and the battery information, and sends the starting auxiliary drive torque value to the BMU manager, so that the BMU manager controls the motor unit to output the starting auxiliary drive torque for starting auxiliary drive, making the engine operate at the optimal working point. When the vehicle running state is the forward state and accelerating, the engine controller calculates the passive auxiliary drive torque value according to the engine information, the battery information, and the engine working point, and sends the passive auxiliary drive torque value to the BMU manager, so that the BMU manager controls the motor unit to output the passive auxiliary drive torque for passive auxiliary drive. When the vehicle running state is the forward state and cruising, the engine controller calculates the active auxiliary drive torque value and the active braking energy recovery torque value according to the engine information, the battery information, and the engine working point, and sends the active auxiliary drive torque value and the active braking energy recovery torque value to the BMU manager, so that the BMU manager controls the motor unit to output the active auxiliary drive torque and the active braking energy recovery torque for active auxiliary drive and active braking energy recovery, thereby adjusting the engine working point and charging the battery unit. When the vehicle running state is the forward state and braking, the engine controller calculates the passive braking energy recovery power according to the brake information, the battery information, and the motor information, and sends the passive braking energy recovery power to the BMU manager, so that the BMU manager controls the motor unit and the battery unit to perform passive braking energy recovery according to the passive braking energy recovery power.

5. The control method according to claim 4, characterized in that, The method further includes: When the vehicle running state is the parking state or the reverse state, the engine controller controls the semi-trailer power part not to perform active / passive auxiliary drive and active / passive braking energy recovery.

6. A control system for braking energy recovery and auxiliary drive, characterized in that, Applied to a semi-trailer vehicle, the semi-trailer vehicle includes a tractor power part and a semi-trailer power part, including: A braking energy recovery and auxiliary drive manager is used to obtain the vehicle information and engine information of the power part of the tractor, and the semi-trailer information of the power part of the semi-trailer. According to the vehicle information and the engine information, it determines the vehicle operating state, and according to the vehicle operating state and the semi-trailer information, controls the power part of the semi-trailer to perform auxiliary drive and / or braking energy recovery; The power part of the tractor includes an engine, a brake, a shifter, a steering gear and a reverse switch, and the power part of the semi-trailer includes a battery unit, a motor unit and a brake management unit BMU manager; The BMU manager is used to monitor the engine, the brake, the shifter, the steering gear and the reverse switch to obtain the vehicle information and engine information. The vehicle information includes at least one of brake information, shifter information, steering gear information and reverse switch information; The BMU manager is also used to monitor the battery unit and the motor unit to obtain semi-trailer information. The semi-trailer information includes battery information and motor information; The BMU manager is also used to, when the vehicle operating state is the starting state, calculate a starting auxiliary drive torque value according to a preset vehicle demand and the battery information, control the motor unit to output the starting auxiliary drive torque, and perform starting auxiliary drive so that the engine is at an optimal operating point; The BMU manager is also used to, when the vehicle operating state is the forward state and accelerating, calculate a passive auxiliary drive torque value according to the engine information, the battery information and the engine operating point, control the motor unit to output the passive auxiliary drive torque, and perform passive auxiliary drive; The BMU manager is also used to, when the vehicle operating state is the forward state and cruising, calculate an active auxiliary drive torque value and an active braking energy recovery torque value according to the engine information, the battery information and the engine operating point, control the motor unit to output the active auxiliary drive torque and the active braking energy recovery torque, and perform active auxiliary drive and active braking energy recovery, so as to adjust the engine operating point and charge the battery unit; The BMU manager is also used to, when the vehicle operating state is the forward state and braking, calculate a passive braking energy recovery power according to the brake information, the battery information and the motor information, and control the motor unit and the battery unit to perform passive braking energy recovery according to the passive braking energy recovery power; The BMU manager is also used to, when the vehicle operating state is the forward state and decelerating, the parking state or the reverse state, control the power part of the semi-trailer not to perform active / passive auxiliary drive and active / passive braking energy recovery.

7. The control system according to claim 6, wherein, The power part of the tractor further includes an engine controller, and the braking energy recovery and auxiliary drive manager is the engine controller; The engine controller is used to monitor the engine, the brake, the shifter, the steering gear and the reverse switch to obtain vehicle information and engine information, where the vehicle information includes at least one of brake information, shifter information, steering gear information and reverse switch information; The engine controller is further used to monitor the battery unit and the motor unit through the BMU manager to obtain semi-trailer information, where the semi-trailer information includes battery information and motor information; When the vehicle running state is the starting state, the engine controller is further used to calculate a starting assist driving torque value according to a preset vehicle demand and the battery information, and send the starting assist driving torque value to the BMU manager, so that the BMU manager controls the motor unit to output a starting assist driving torque for starting assist driving, and makes the engine operate at an optimal operating point; When the vehicle running state is the forward state and accelerating, the engine controller is further used to calculate a passive assist driving torque value according to the engine information, the battery information and the engine operating point, and send the passive assist driving torque value to the BMU manager, so that the BMU manager controls the motor unit to output a passive assist driving torque for passive assist driving; When the vehicle running state is the forward state and cruising, the engine controller is further used to calculate an active assist driving torque value and an active braking energy recovery torque value according to the engine information, the battery information and the engine operating point, and send the active assist driving torque value and the active braking energy recovery torque value to the BMU manager, so that the BMU manager controls the motor unit to output an active assist driving torque and an active braking energy recovery torque for active assist driving and active braking energy recovery, thereby adjusting the engine operating point and charging the battery unit; When the vehicle running state is the forward state and braking, the engine controller is further used to calculate a passive braking energy recovery power according to the brake information, the battery information and the motor information, and send the passive braking energy recovery power to the BMU manager, so that the BMU manager controls the motor unit and the battery unit to perform passive braking energy recovery according to the passive braking energy recovery power; When the vehicle running state is the forward state and decelerating, the parking state or the reverse state, the engine controller is further used to control the power part of the semi-trailer not to perform active / passive assist driving and active / passive braking energy recovery.

Images