Driving method and vehicle

Abstract

The invention provides a driving method and a vehicle. The driving method comprises the steps that the current remaining electric quantity of a battery and the current load working condition of a walking system are obtained; adjusting the power generation power of the engine according to the current residual electric quantity, enabling the engine to generate power for the battery through the generator, and maintaining the electric quantity balance of the battery; driving modes are determined according to the current load working condition, the driving modes at least comprise a pure electric mode, a hybrid mode and a fuel oil mode, in the pure electric mode, the generator stops running, the battery is controlled to supply power to the walking motor, in the hybrid mode, the engine and the battery supply power to the walking motor together, and in the fuel oil mode, the engine supplies power to the walking motor. And the electric energy output of the battery is closed. The power generation power of the engine can be adjusted according to the current residual electric quantity, different driving modes are adopted according to different working conditions, the problem that a single driving mode cannot adapt to various working condition requirements can be avoided, meanwhile, the cost of the hybrid power driving system can be reduced, and the use stability and the service life of the hybrid power driving system are ensured.

Description

Technical Field

[0001] The present invention belongs to the technical field of motor vehicles, and in particular relates to a driving method and a vehicle. Background Art

[0002] With the increasingly stringent environmental protection requirements and the increasing demand for energy efficiency, traditional loaders and other vehicles are facing huge challenges. There are two main types of loaders on the market: traditional internal combustion engine-driven loaders and pure electric loaders. Although traditional internal combustion engine-driven loaders have high power output capabilities, they are also accompanied by high fuel consumption and greater environmental pollution problems. Although pure electric loaders perform well in environmental protection, their endurance and power performance still need to be improved.

[0003] In recent years, with the increasing requirements for energy conservation and emission reduction, hybrid technology has been widely used in the field of construction machinery. Hybrid loaders combine the advantages of internal combustion engines and electric motors, which can not only ensure sufficient power output, but also reduce fuel consumption and emissions to a certain extent. However, existing hybrid loaders have the following problems:

[0004] 1. Most hybrid loaders have a single working mode and cannot adapt well to various working conditions.

[0005] 2. The travel system is a drive axle / box drive. Currently, the drive axles of large-tonnage loaders are all imported, with high costs, imperfect braking energy recovery mechanisms, and low energy utilization rates. Summary of the invention

[0006] The main purpose of the present invention is to provide a driving method and a vehicle, aiming to solve the technical problem in the prior art that the hybrid power driving working mode is single and cannot adapt well to various working conditions.

[0007] In order to achieve the above object, the present invention provides a driving method, which is applied to a hybrid power driving system, wherein the hybrid power driving system comprises:

[0008] an engine for driving a hydraulic system of said vehicle;

[0009] A travel motor, used to drive the travel system of the vehicle;

[0010] A battery, electrically connected to the travel motor and used to supply power to the travel motor;

[0011] A generator is drivingly connected to the engine, the battery and the travel motor are electrically connected to the generator, and the engine can drive the generator to supply power to the battery and the travel motor;

[0012] The method comprises:

[0013] Obtaining the current remaining power of the battery and the current load condition of the travel system;

[0014] adjusting the power generation power of the engine according to the current remaining power, so that the engine generates power to the battery through the generator and maintains the power balance of the battery;

[0015] The driving mode is determined according to the current load condition, and the driving mode includes at least a pure electric mode, a hybrid mode and a fuel mode. In the pure electric mode, the generator stops running and controls the battery to supply power to the travel motor. In the hybrid mode, the engine and the battery supply power to the travel motor together. In the fuel mode, the engine supplies power to the travel motor and turns off the power output of the battery.

[0016] In an embodiment of the present invention, determining the driving mode according to the current load condition includes:

[0017] Entering the pure electric mode when the current load condition is low load;

[0018] Closing the power supply channel between the generator and the travel motor;

[0019] The battery is controlled to supply power to the walking motor so that the walking motor drives the walking system.

[0020] In an embodiment of the present invention, determining the driving mode according to the current load condition includes:

[0021] When the current load condition is medium load, the hybrid mode is entered;

[0022] Controlling the generator to enter a power generation mode;

[0023] The engine drives the generator to generate electricity, so that the engine and the battery together supply power to the travel motor.

[0024] In an embodiment of the present invention, determining the driving mode according to the current load condition includes:

[0025] When the current load condition is high load and the current remaining power is less than the preset electric drive value, the fuel mode is entered;

[0026] Controlling the generator to enter a power generation mode and shutting down the power output of the battery;

[0027] The engine drives the generator to generate electricity, so that the engine supplies power to the travel motor.

[0028] In an embodiment of the present invention, adjusting the power generation power of the engine according to the current remaining power includes:

[0029] Acquire the current power consumption of the battery and a preset power range, wherein the preset power range includes at least a low power range, a medium power range and a high power range;

[0030] Determine the current power state according to the current remaining power and the preset power range;

[0031] The power generation power of the engine is adjusted according to the current power state and the current power consumption of the battery.

[0032] In an embodiment of the present invention, adjusting the power generation power of the engine according to the current power state and the current power consumption of the battery includes:

[0033] Determining that the current remaining power is in a low power state, controlling the engine to generate power at a charging power greater than the current power consumption;

[0034] Determining that the current remaining power is in a medium power state, controlling the engine to charge at a balanced power, wherein the balanced power is balanced with the current power consumption;

[0035] It is determined that the current remaining power is in a high power state, and the engine is controlled to be charged with a power consumption, where the power consumption is less than the current power consumption.

[0036] In an embodiment of the present invention, the hybrid drive system further includes a backup starter motor electrically connected to the vehicle controller, and the method further includes:

[0037] Obtain starting signal and electric starting conditions;

[0038] When it is determined that the current remaining power meets the electric starting condition, controlling the battery to drive the engine to rotate through the generator;

[0039] When it is determined that the current remaining power does not meet the electric starting condition, the standby starter motor is controlled to drive the engine to rotate.

[0040] In an embodiment of the present invention, the hybrid drive system further includes a power generation controller electrically connected to the generator, and the control of the battery to drive the engine to rotate through the generator includes:

[0041] Acquiring a starting torque value of the generator;

[0042] Controlling the generator to enter a motor mode and the generator controller to enter a motor torque control mode;

[0043] The generator controller is controlled to adjust the output torque of the generator according to the starting torque value until the current speed of the engine reaches a minimum stable idle speed.

[0044] In an embodiment of the present invention, the method further includes:

[0045] Determining that the travel system is in a braking condition;

[0046] The travel motor is controlled to enter a power generation mode, so that the travel motor converts braking kinetic energy into electrical energy and stores the electrical energy in the battery.

[0047] The present invention further provides a vehicle, comprising a hydraulic system, a traveling system and a hybrid driving system, wherein the hybrid driving system is configured to execute the driving method as described above.

[0048] Through the above technical solution, the hybrid power drive system provided by the embodiment of the present invention has the following beneficial effects:

[0049] According to the current load working condition, the driving mode is determined, and the working state of the engine, generator and battery is adjusted under different working conditions, so as to improve the working efficiency and have high flexibility. A single working mode is avoided, and various working conditions can be well adapted. At the same time, the combination of the engine, generator and battery can reduce fuel consumption while maintaining sufficient power, and high efficiency and energy saving can be achieved. In addition, the structural mode of using the walking motor to directly drive the walking system can cancel the drive axle in the prior art, which can greatly reduce the production cost of the hybrid power drive system. At the same time, the power generation of the engine is adjusted according to the current remaining power, so that the engine generates power to the battery through the generator, and the power balance of the battery is maintained, so that the stability of the battery power can be maintained at all times, and the situation that the battery cannot be driven electrically due to lack of power can be avoided, and the situation that the battery is overcharged can be avoided, thereby improving the use stability and service life of the hybrid power drive system. The hybrid power drive system in the present invention can adjust the power generation of the engine according to the current remaining power and adopt different driving modes according to different working conditions, which can avoid the single driving mode from not being able to adapt to various working conditions, and can also reduce the cost of the hybrid power drive system and ensure the use stability and service life of the hybrid power drive system.

[0050] Other features and advantages of the present invention will be described in detail in the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0051] The accompanying drawings are used to provide an understanding of the present invention and constitute a part of the specification. Together with the following specific embodiments, they are used to explain the present invention, but do not constitute a limitation of the present invention. In the accompanying drawings:

[0052] Figure 1is a schematic structural diagram of a hybrid power drive system according to an embodiment of the present invention;

[0053] Figure 2 is a schematic diagram of the connection structure between the engine and the hydraulic system according to one embodiment of the present invention;

[0054] Figure 3 is a flow chart of a driving method according to an embodiment of the present invention.

[0055] Description of Reference Numerals

[0056] Label Name Label Name

[0057] 100 Hybrid Drive System 6 Power Distribution Unit

[0058] 1 Engine 7 Motor Controller

[0059] 2 Travel motor 200 Hydraulic system

[0060] 3 Batteries 210 Steering Pump

[0061] 4 Generator 220 Working pump

[0062] 5 Generator controller 300 transfer case DETAILED DESCRIPTION

[0063] The specific embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. It should be understood that the specific embodiments described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention.

[0064] The driving method according to the present invention will be described below with reference to the accompanying drawings.

[0065] like Figure 1 As shown, in an embodiment of the present invention, the driving method is applied to a hybrid driving system 100, and the hybrid driving system 100 includes an engine 1, a travel motor 2, a battery 3 and a generator 4; the engine 1 is used to drive the hydraulic system 200 of the vehicle; the travel motor 2 is used to drive the travel system of the vehicle; the battery 3 is electrically connected to the travel motor 2 and is used to supply power to the travel motor 2; the generator 4 is transmission-connected to the engine 1, and the battery 3 and the travel motor 2 are both electrically connected to the generator 4, and the engine 1 can drive the generator 4 to supply power to the battery 3 and the travel motor 2; Figure 3 As shown, in one embodiment, the driving method includes:

[0066] Step 101, obtaining the current remaining power of the battery 3 and the current load condition of the traveling system;

[0067] Step 102, adjusting the power generation of the engine 1 according to the current remaining power, so that the engine 1 generates power to the battery 3 through the generator 4, and the power balance of the battery 3 is maintained;

[0068] Step 103, determine the driving mode according to the current load condition, the driving mode includes at least pure electric mode, hybrid mode and fuel mode, the generator 4 in the pure electric mode stops running, and the battery 3 is controlled to supply power to the travel motor 2, the engine 1 and the battery 3 in the hybrid mode supply power to the travel motor 2 together, and the engine 1 in the fuel mode supplies power to the travel motor 2, and the power output of the battery 3 is turned off.

[0069] It can be understood that the number of the travel motors 2 in this embodiment can be one or more. In one embodiment, the number of the travel motors 2 is consistent with the number of the travel wheels in the travel system and is connected one-to-one. The number of the travel motors 2 is four, and the hybrid drive system 100 further includes four motor controllers 7, and the motor controllers 7 are electrically connected to the travel motors 2 one-to-one. In another embodiment, one motor controller 7 is connected to multiple travel motors 2 at the same time, and the present invention does not limit the number of motor controllers 7.

[0070] The engine 1 in the hybrid drive system 100 of this embodiment is used as the main power source. The generator 4 is matched with the engine 1 to ensure stable output of sufficient electric energy. The power generation controller 5 is responsible for monitoring the working state of the generator 4 and adjusting its output voltage and current. The power distribution unit 6 is used to distribute and manage electric energy to various electrical devices. The motor controller 7: Each travel motor 2 is equipped with an independent controller to achieve precise control. Figure 2 As shown, the transfer case 300 has two power take-off ports, one of which drives the steering pump 210 of the hydraulic system 200, and the other drives the working pump 220 of the hydraulic system 200. The transfer case 300 is used to distribute the power of the engine 1 to the steering pump 210 and the working pump 220 of the hydraulic system 200. The steering pump 210 provides hydraulic power for the steering system, and the working pump 220 provides hydraulic power for the working device.

[0071] The engine 1 and the generator 4 in this embodiment are combined into a series hybrid power system. The engine 1 drives the generator 4 to generate electricity, and at the same time drives the transfer case 300 to operate through the transmission shaft. The transfer case 300 is responsible for distributing the power of the engine 1 to the steering pump 210 and the working pump 220. The generator 4 supplies power to the motor controller 7 and the travel motor 2. The battery 3 is used to provide electrical energy when the power load is high, and to recover the braking energy as an energy storage device when the travel motor 2 brakes.

[0072] It should be noted that the hybrid drive system 100 in this embodiment is mainly used for vehicles such as large-tonnage loaders. Figure 1The solid lines in the figure represent mechanical structure connections, which can be used for transmission and drive between components, and the dotted lines represent electrical connections, which can be used for electrical signal transmission and power transmission between components. The generator 4, the power generation controller 5, the power distribution unit 6, the motor controller 7 and the travel motor 2 are electrically connected in sequence, the battery 3 and the power distribution unit 6 are electrically connected, and the engine 1 and the generator 4 are in transmission connection.

[0073] In this embodiment, the driving mode is determined according to the current load condition, so that the working state of the engine 1, the generator 4 and the battery 3 can be adjusted under different working conditions, thereby improving the working efficiency and having high flexibility. A single working mode is avoided, and various working conditions can be well adapted. At the same time, the combination of the engine 1, the generator 4 and the battery 3 can reduce fuel consumption while maintaining sufficient power, thereby achieving high efficiency and energy saving. In addition, the structural method of using the walking motor 2 to directly drive the walking system can eliminate the drive axle in the prior art, which can greatly reduce the production cost of the hybrid power drive system 100. At the same time, the power generation power of the engine 1 is adjusted according to the current remaining power, so that the engine 1 generates power to the battery 3 through the generator 4, and the power balance of the battery 3 is maintained, so that the power of the battery 3 can always be kept stable, so that the situation that the battery 3 cannot be driven electrically due to lack of power can be avoided, and the situation that the battery 3 is overcharged can be avoided, thereby improving the use stability and service life of the hybrid power drive system 100. The hybrid drive system 100 in this embodiment can adjust the power generation power of the engine 1 according to the current remaining power and adopt different driving modes according to different working conditions. This can avoid the situation where a single driving mode cannot adapt to various working conditions, while also reducing the cost of the hybrid drive system 100 and ensuring the stability and life of the hybrid drive system 100.

[0074] In an embodiment of the present invention, determining the driving mode according to the current load condition includes:

[0075] Entering the pure electric mode when the current load condition is low load;

[0076] Close the power supply channel between the generator 4 and the travel motor 2;

[0077] The control battery 3 supplies power to the travel motor 2 so that the travel motor 2 drives the travel system.

[0078] When the vehicle needs to accelerate in a short time, or lift without load, collect the bucket in place, or travel without load, or when the current remaining power of battery 3 is high, the travel system load is not large, and the current load condition is determined to be low load, and enters the pure electric mode, the vehicle controller can control the engine 1 to provide power for the hydraulic system 200, and the battery 3 to provide power for the travel system. The auxiliary role of the battery 3 can be fully utilized to reduce fuel consumption. In this mode, the vehicle controller can control the power distribution unit 6 to close the channel of the power generation controller 5, and the generator 4 does not generate electricity.

[0079] The vehicle controller can control the engine 1 to run and provide the main power to the hydraulic system 200, and the hydraulic system 200 may include a steering pump 210 and a working pump 220. The vehicle controller can control the battery 3 to supply power to the travel motor 2 to drive the loader to travel, so as to reduce fuel consumption.

[0080] The vehicle controller can control the power distribution unit 6 to manage and distribute the electric energy from the battery 3 . When power is needed, the vehicle controller can control the power distribution unit 6 to only extract electric energy from the battery 3 and distribute it to the travel motor 2 .

[0081] When the vehicle controller determines that the travel brake is in effect, the travel motor 2 can be controlled to enter a power generation mode, converting kinetic energy into electrical energy and storing it in the battery 3, thereby improving energy utilization efficiency.

[0082] In an embodiment of the present invention, determining the driving mode according to the current load condition includes:

[0083] When the current load condition is medium load, the hybrid mode is entered;

[0084] Controlling the generator 4 to enter a power generation mode;

[0085] The engine 1 drives the generator 4 to generate electricity, so that the engine 1 and the battery 3 supply power to the travel motor 2 together.

[0086] The vehicle controller detects that the vehicle is performing transportation operations on a flat road, traveling at high speed, or the current remaining power of the battery 3 is low and needs to be charged, and the travel system is in a medium-load operating environment. The vehicle controller can determine that the current load condition is medium load and enter the hybrid mode. The vehicle controller can control the engine 1 to provide the main power to the hydraulic system 200, and the vehicle controller can control the generator 4 to supply power to the travel motor 2 to drive the loader to move.

[0087] Specifically, the operation of the engine 1 provides the main power to the hydraulic system 200 to drive the loader to work or turn. The engine 1 drives the generator 4 to rotate through the transmission shaft. The electric energy generated by the generator 4 is adjusted by the power generation controller 5 and sent to the power distribution unit 6 for energy distribution. The power distribution unit 6 supplies the electric energy to the motor controller 7. The motor controller 7 adjusts the electric energy as needed to provide power for the travel motor 2, thereby controlling the operation of the travel motor 2.

[0088] In one embodiment, the vehicle controller obtains that the vehicle is in the state of shoveling materials, working on steep terrain, continuous high-intensity work, etc., and can determine that the current load condition is high load, and can use the combination of engine 1, generator 4, and battery 3 to provide sufficient power to ensure that the loader always maintains good performance. The engine 1 in this embodiment operates as the main power source of the hydraulic system 200, the generator 4 supplies power to the travel motor 2, and the battery 3 serves as an auxiliary power source, and together with the generator 4 supplies power to the travel motor 2. This mode is suitable for high-load operation conditions, can provide maximum power output, and at the same time, with the assistance of the battery 3, improves the overall power and energy efficiency.

[0089] Specifically, engine 1 drives: the operation of engine 1 provides the main power to the hydraulic system 200, driving the loader to work or turn. Generator 4 supplies power: the engine 1 drives the generator 4 to rotate through the transmission shaft. The electric energy generated by the generator 4 is adjusted by the power generation controller 5 and sent to the power distribution unit 6 for energy distribution. The power distribution unit 6 supplies the electric energy to the four motor controllers 7. The motor controller 7 adjusts the electric energy as needed to provide power for the travel motor 2, thereby controlling the operation of the travel motor 2. Battery 3 auxiliary power supply: during high-load operation, the battery 3 acts as an auxiliary power source and supplies power to the travel motor 2 together with the generator 4. The vehicle's battery 3 management system (BMS) monitors the status of the battery 3 to ensure that the battery 3 operates within a safe range and adjusts the charging and discharging strategy of the battery 3 as needed.

[0090] In another embodiment, determining the driving mode according to the current load condition includes:

[0091] When the current load condition is high load and the current remaining power is less than the preset electric drive value, the fuel mode is entered;

[0092] Control the generator 4 to enter the power generation mode and shut down the power output of the battery 3;

[0093] The engine 1 drives the generator 4 to generate electricity, so that the engine 1 supplies power to the travel motor 2 .

[0094] In this embodiment, the driving mode is adjusted by combining two vehicle factors, namely the current load condition and the current remaining power. This can avoid the situation where the battery 3 is discharged at low power and causes insufficient power. It can also achieve high-power driving under low power conditions, and can improve the adaptability of the hybrid drive system 100.

[0095] In the embodiment of the present invention, adjusting the power generation power of the engine 1 according to the current remaining power includes:

[0096] Obtaining the current power consumption and the preset power range of the battery 3, wherein the preset power range includes at least a low power range, a medium power range and a high power range;

[0097] Determine the current power state according to the current remaining power and the preset power range;

[0098] The power generation power of the engine 1 is adjusted according to the current power state and the current power consumption of the battery 3 .

[0099] In this embodiment, the current remaining power value can be divided into three areas (three management states), and the power generation power of the engine 1 can be automatically adjusted when the current remaining power is in a low power interval, a medium power interval or a high power interval, which can avoid energy waste and realize intelligent charging and discharging regulation. Optionally, in one embodiment, the low power interval is less than 10%, the medium power interval is greater than or equal to 10%, and the high power interval is greater than or equal to 90%. In other embodiments, the preset power interval can be set according to actual usage requirements.

[0100] In the embodiment of the present invention, adjusting the power generation power of the engine 1 according to the current power state and the current power consumption of the battery 3 includes:

[0101] Determining that the current remaining power is in a low power state, controlling the engine 1 to generate power at a charging power greater than the current power consumption;

[0102] Determine that the current remaining power is in a medium power state, control the engine 1 to charge at a balanced power, and the balanced power is balanced with the current power consumption;

[0103] It is determined that the current remaining power is in a high power state, and the engine 1 is controlled to be charged with a power consumption, and the power consumption is less than the current power consumption.

[0104] Specifically, in one embodiment, when the current remaining power is low (when the current remaining power is <10%), the vehicle controller can control the hybrid drive system 100 to enter the fuel mode, increase the power generation of the engine 1 to the charging power, so that the power generation in the preset time period is greater than the current power consumption, so that the power of the battery 3 increases to meet the high-power power reserve;

[0105] The current remaining power is moderate (10% ≤ current remaining power < 90%), the vehicle controller can adjust the power generation to the balance power according to the current power consumption, so that the power generation in the preset time period ≈ the current power consumption, maintain the power balance of the battery 3, and the driving mode can be adjusted according to the current load condition;

[0106] When the current remaining power is high (the current remaining power is ≥ 90%), the vehicle controller can give priority to using the pure electric mode of engine 1 to drive the hydraulic system 200 and battery 3 to drive the travel system, and control engine 1 to not generate electricity or generate electricity at a lower power, so that the power of battery 3 decreases, reserving space for braking feedback.

[0107] In the embodiment of the present invention, the hybrid drive system 100 further includes a backup starter motor electrically connected to the vehicle controller, and the driving method further includes:

[0108] Obtain starting signal and electric starting conditions;

[0109] When it is determined that the current remaining power meets the electric starting condition, the battery 3 is controlled to drive the engine 1 to rotate through the generator 4;

[0110] When it is determined that the current remaining power does not meet the electric starting condition, the standby starter motor is controlled to drive the engine 1 to rotate.

[0111] In this embodiment, the battery 3 can be automatically selected to start the engine 1 or the backup starter motor can be automatically selected to start the engine 1 according to the current remaining power and electric starting conditions. Starting the engine 1 through external drive can avoid the difficulty of starting the engine 1 in cold weather conditions, and can improve the starting efficiency of the hybrid drive system 100.

[0112] In the embodiment of the present invention, the hybrid drive system 100 further includes a power generation controller 5 electrically connected to the generator 4, which controls the battery 3 to drive the engine 1 to rotate through the generator 4:

[0113] Obtaining a starting torque value of the generator 4;

[0114] Control the generator 4 to enter the motor mode and the power generation controller 5 to enter the motor torque control mode;

[0115] The power generation controller 5 is controlled to adjust the output torque of the generator 4 according to the starting torque value until the current speed of the engine 1 reaches the lowest stable idle speed.

[0116] Specifically, the vehicle controller in this embodiment can control the battery 3 to supply power to drive the generator 4, and the generator 4 enters the motor mode. The generator 4 converts electrical energy into mechanical energy and reversely starts the engine 1.

[0117] Startup process:

[0118] The operator presses the start button, triggering the start signal;

[0119] When the vehicle controller detects the start signal, it sends a start command to the generator controller 5. The generator controller 5 enters the motor torque control mode. The electric energy of the battery 3 is supplied to the generator 4 through the power distribution unit 6 and the generator controller 5. The generator 4 enters the motor mode at this time. The generator controller 5 enters the motor torque control mode. According to the starting characteristics of the engine 1, the starting torque value can be pre-set. The generator controller 5 adjusts the current flowing through the generator 4 according to the set starting torque value, controls the output torque of the generator 4, and the generator 4 rotates as a motor, driving the crankshaft of the engine 1 to rotate through the transmission shaft. When the engine 1 reaches the lowest stable idle speed of 400rpm, the generator 4 stops working as a motor and switches back to the normal power generation mode.

[0120] The backup starter motor of the engine 1 in this embodiment is used as a backup starting means when the battery 3 cannot meet the starting requirements. Compared with the traditional starter, the battery 3 starts the engine 1 with less reliance on the backup starter motor and reduces wear. Even in adverse conditions, such as cold weather or when the engine 1 has not been used for a long time, it can be effectively started, which is suitable for starting, especially for starting in low temperature and extreme cold (above -35°C).

[0121] In an embodiment of the present invention, the driving method further includes:

[0122] Make sure the travel system is in braking condition;

[0123] The travel motor 2 is controlled to enter a power generation mode, so that the travel motor 2 converts the braking kinetic energy into electrical energy, and stores the electrical energy in the battery 3 .

[0124] The vehicle controller in this embodiment can control the travel motor 2 to automatically perform braking energy recovery, thereby improving energy utilization efficiency. The braking energy recovery mechanism is perfect and the energy utilization rate is high.

[0125] The present invention further proposes a vehicle, which includes a hydraulic system 200, a travel system and the hybrid drive system 100 as described above. The specific structure of the hybrid drive system 100 refers to the above embodiment, and the hybrid drive system 100 is configured to perform the above driving method. Since the vehicle adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought by the technical solutions of the above embodiments, which will not be repeated here one by one.

[0126] In one embodiment, the engineering vehicle may be applied to a loader. The steering pump 210 of the hydraulic system 200 is used to pump oil to the steering system of the vehicle, and the working pump 220 of the hydraulic system 200 is used to pump oil to the working system of the vehicle.

[0127] In this embodiment, the vehicle also includes a steering system and a working system. The steering pump 210 of the hydraulic system 200 is used to provide the pressure oil required by the steering system. The pressure oil goes to the flow amplification valve of the steering system. The flow amplification valve can increase the flow and supply the pressure oil to the steering gear and steering cylinder of the steering system.

[0128] In this embodiment, the oil pumped by the working pump 220 of the hydraulic system 200 can pass through the multi-way valve of the working system to the buffer valve group to the bucket cylinder and the boom cylinder. The multi-way valve can merge with the flow amplification valve. When the hydraulic system 200 is under high load, the system merges according to demand.

[0129] Specifically, the vehicle controller can control the flow rate output by the working pump 220 by controlling the output current according to the handle opening information of the vehicle, so that the output flow rate of the working pump 220 is positively correlated with the handle opening.

[0130] The vehicle controller can output electrical signals to the vehicle's electronic control valve according to the movement of the handle, control the movement of the boom and bucket valve stem of the electronic control valve, so that the hydraulic oil in the main oil circuit enters the oil cylinder through the vehicle's main control valve.

[0131] The vehicle controller can also adjust the flow rate output by the steering pump 210 according to the feedback of the steering load pressure.

[0132] In one embodiment, the working system may adopt a hydraulic electric control positive flow system, which is independently supplied with oil by a separate electric control variable piston pump. The steering system may adopt a hydraulic electric control positive flow system, which is independently supplied with oil by a separate electric control variable piston pump.

[0133] In the description of the present invention, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0134] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0135] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0136] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. A driving method, applied to a hybrid driving system (100), characterized in that: The hybrid drive system (100) comprises: an engine (1) for driving the hydraulic system (200) of the vehicle; a travel motor (2) for driving the travel system of the vehicle; a battery (3) electrically connected to the travel motor (2) and used to supply power to the travel motor (2); a generator (4) drivingly connected to the engine (1), the battery (3) and the travel motor (2) being electrically connected to the generator (4), and the engine (1) can drive the generator (4) to supply power to the battery (3) and the travel motor (2); The method comprises: Obtaining the current remaining power of the battery (3) and the current load condition of the walking system; adjusting the power generation of the engine (1) according to the current remaining power, so that the engine (1) generates power to the battery (3) through the generator (4), and maintaining the power balance of the battery (3); The driving mode is determined according to the current load condition, and the driving mode includes at least a pure electric mode, a hybrid mode and a fuel mode. In the pure electric mode, the generator (4) stops running and controls the battery (3) to supply power to the travel motor (2). In the hybrid mode, the engine (1) and the battery (3) supply power to the travel motor (2) together. In the fuel mode, the engine (1) supplies power to the travel motor (2) and shuts down the power output of the battery (3).

2. The method according to claim 1, characterized in that Determining the driving mode according to the current load condition includes: Entering the pure electric mode when the current load condition is low load; Closing the power supply channel between the generator (4) and the travel motor (2); The battery (3) is controlled to supply power to the walking motor (2), so that the walking motor (2) drives the walking system.

3. The method according to claim 1, characterized in that Determining the driving mode according to the current load condition includes: When the current load condition is medium load, the hybrid mode is entered; Controlling the generator (4) to enter a power generation mode; The engine (1) drives the generator (4) to generate electricity, so that the engine (1) and the battery (3) together supply power to the travel motor (2).

4. The method according to claim 1, characterized in that: Determining the driving mode according to the current load condition includes: When the current load condition is high load and the current remaining power is less than the preset electric drive value, the fuel mode is entered; Controlling the generator (4) to enter a power generation mode and shutting down the power output of the battery (3); The engine (1) drives the generator (4) to generate electricity, so that the engine (1) supplies power to the travel motor (2).

5. The method according to any one of claims 1 to 4, characterized in that: The step of adjusting the power generation power of the engine (1) according to the current remaining power comprises: Acquiring the current power consumption of the battery (3) and a preset power range, wherein the preset power range includes at least a low power range, a medium power range and a high power range; Determine the current power state according to the current remaining power and the preset power range; The power generation power of the engine (1) is adjusted according to the current power state and the current power consumption of the battery (3).

6. The method according to claim 5, characterized in that The step of adjusting the power generation of the engine (1) according to the current power state and the current power consumption of the battery (3) comprises: Determining that the current remaining power is in a low power state, controlling the engine (1) to generate power at a charging power greater than the current power consumption; Determining that the current remaining power is in a medium power state, controlling the engine (1) to charge at a balanced power, wherein the balanced power is balanced with the current power consumption; It is determined that the current remaining power is in a high power state, and the engine (1) is controlled to be charged at a power consumption which is less than the current power consumption.

7. The method according to any one of claims 1 to 4, characterized in that The hybrid drive system (100) further includes a backup starter motor, and the method further includes: Obtain starting signal and electric starting conditions; When it is determined that the current remaining power meets the electric starting condition, controlling the battery (3) to drive the engine (1) to rotate via the generator (4); When it is determined that the current remaining power does not meet the electric starting condition, the standby starter motor is controlled to drive the engine (1) to rotate.

8. The method according to claim 7, characterized in that The hybrid drive system (100) further comprises a power generation controller (5) electrically connected to the generator (4), wherein the control of the battery (3) to drive the engine (1) to rotate via the generator (4) comprises: Obtaining a starting torque value of the generator (4); Controlling the generator (4) to enter a motor mode and the power generation controller (5) to enter a motor torque control mode; The power generation controller (5) is controlled to adjust the output torque of the generator (4) according to the starting torque value until the current rotation speed of the engine (1) reaches the lowest stable idle speed.

9. The method according to any one of claims 1 to 4, characterized in that: The method further comprises: Determining that the travel system is in a braking condition; The travel motor (2) is controlled to enter a power generation mode, so that the travel motor (2) converts braking kinetic energy into electrical energy, and stores the electrical energy in the battery (3).

10. A vehicle, characterized in that: The vehicle comprises a hydraulic system (200), a traveling system and a hybrid driving system (100), wherein the hybrid driving system (100) is configured to execute the driving method according to any one of claims 1 to 9.

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