Power distribution transmission system

Abstract

The utility model discloses a power distribution transmission system which comprises an engine, a torque converter, a gearbox and a hydraulic pump providing power for a working device, the torque converter comprises a pump wheel and a turbine, the engine is connected with the pump wheel, the pump wheel and the turbine are connected through a hydraulic transmission system, the turbine is connected with the gearbox, and the hydraulic pump is connected with an oil cylinder through a hydraulic system. The measuring device is used for measuring the transmission ratio between the pump wheel and the turbine, at least one hydraulic pump is a controllable variable hydraulic pump capable of adjusting the displacement, and the controller is used for controlling the displacement of the hydraulic pump according to the transmission ratio between the pump wheel and the turbine and load information of the hydraulic system. According to the requirements of working conditions, the displacement of the variable hydraulic pump is controlled under different working conditions, so that the power consumption of the hydraulic pump is reduced, the whole operation process of the machine is monitored, the power is redistributed, the oil consumption is reduced, the power requirement of the whole machine is reduced, and finally, the same whole machine performance is met by lower displacement and power of a diesel engine.

Description

Technical Field

[0001] This utility model relates to a transmission system, and more particularly to a power distribution transmission system, belonging to the field of loader technology. Background Technology

[0002] Currently, wheel loaders utilize a hydraulic system with a hydraulic torque converter as the main component, combining hydraulic transmission and a gear pump. The hydraulic transmission system generates the traction force required for operation, while the hydraulic system generates the digging and lifting forces of the working device and enables steering. The performance of a loader is primarily reflected in its significant traction, digging, and lifting forces. Generally, when selecting diesel engine power, the combined hydraulic power of the hydraulic transmission and gear pump is used as the basis for choosing the appropriate diesel engine power. However, during digging, the digging force causes a significant drop in traction, affecting digging efficiency. On the other hand, the engine power cannot be too high, otherwise, fuel economy will suffer and fuel consumption will increase significantly. Summary of the Invention

[0003] The technical problem to be solved by this utility model is: how to reasonably allocate the power generated by the hydraulic transmission to generate the traction force of the whole machine and the power generated by the hydraulic system to generate the digging force and lifting force, thereby reducing the cost of diesel engine selection and the fuel consumption of the whole vehicle.

[0004] To solve the above-mentioned technical problems, the technical solution of this utility model is to provide a power distribution transmission system, including an engine, a torque converter, a gearbox, and a hydraulic pump that provides power to the working device. The torque converter includes a pump impeller and a turbine. The engine is connected to the pump impeller, and the pump impeller and the turbine are connected through a hydraulic transmission system. The turbine is connected to the gearbox, and the hydraulic pump is connected to a cylinder through a hydraulic system. The feature is that it also includes a measuring device for measuring the transmission ratio between the pump impeller and the turbine. At least one hydraulic pump is a controllable variable displacement hydraulic pump that can adjust its displacement. It also includes a controller that controls the displacement of the hydraulic pump based on the transmission ratio between the pump impeller and the turbine and the load information of the hydraulic system.

[0005] Preferably, the measuring device is a pump wheel speed sensor and a turbine speed sensor for measuring the rotational speed of the pump wheel and turbine; or the measuring device is a torque sensor.

[0006] Preferably, the pump wheel speed sensor is located on the engine or pump wheel; the turbine speed sensor is located on the turbine or gearbox.

[0007] Preferably, the cylinder or hydraulic system is equipped with a hydraulic sensor, and the hydraulic pump is equipped with a proportional solenoid valve to control the hydraulic opening; the controller is connected to the torque converter, the hydraulic sensor and the proportional solenoid valve; the hydraulic system load information includes the pressure fed back by the hydraulic load measured by the hydraulic sensor and the flow rate calculated by the current on the proportional solenoid valve.

[0008] Preferably, the torque sensor is located on the engine, transmission, or torque converter.

[0009] Preferably, the cylinder or hydraulic system is equipped with a hydraulic sensor, and the hydraulic pump is equipped with a proportional solenoid valve for controlling the hydraulic opening; the controller is connected to the torque sensor, the hydraulic sensor, and the proportional solenoid valve; the hydraulic system load information includes the pressure feedback of the hydraulic load measured by the hydraulic sensor and the flow rate calculated by the current on the proportional solenoid valve.

[0010] This invention utilizes a transmission system to control the digging force during excavation, minimizing its impact on traction. The hydraulic pump employs a variable displacement pump, making it controllable. During excavation, power is prioritized over speed. During excavation, the hydraulic system pressure is increased to enhance the digging force, reducing the pump wheel's power and minimizing its impact on traction. However, when not excavating, the hydraulic power is higher to increase the lifting force of the working device and improve lifting efficiency. The timing of high and low hydraulic power depends on the required power for travel traction. A torque converter, pump wheel speed sensor, and turbine speed sensor (or torque sensor) are installed in the transmission to determine the required traction force. However, due to the complexity of the torque sensor's structure and principle, the optimal solution is to measure the torque converter's transmission ratio to inversely deduce the transmission torque, thus solving the problem of monitoring the required transmission power. The vehicle's travel force (i.e., turbine speed) is the traction force. The digging force is related to both the traction force and the hydraulic system pressure (i.e., the hydraulic pump's displacement); however, the lifting force is only related to the hydraulic system pressure (i.e., the hydraulic pump's displacement).

[0011] Traditional hydraulic pumps are fixed-displacement pumps, meaning their power output cannot be adjusted according to operating conditions, resulting in power waste, high displacement and power requirements, and high fuel consumption. The transmission system provided by this invention changes the hydraulic pump to a variable-displacement pump.

[0012] The transmission system provided by this utility model can collect pump wheel and turbine speed information and workload information through the controller according to the working conditions, realize the control of the hydraulic pump displacement under different working conditions, thereby reducing the power consumption of the hydraulic pump, monitoring and redistributing power throughout the machine's operation, removing excess power, reducing useless losses, lowering fuel consumption, and reducing the overall machine power requirements. Ultimately, it achieves the same overall machine performance with a lower diesel engine displacement and power. This greatly reduces the cost of diesel engine selection and overall vehicle fuel consumption. The use of the controller enables coordinated action when the bucket and boom perform compound actions (existing gear pump metering systems cannot perform compound actions), thus improving work efficiency. Attached Figure Description

[0013] Figure 1 A schematic diagram of the transmission principle of a power distribution transmission system;

[0014] Figure 2A flowchart illustrating the working principle of a power distribution transmission system;

[0015] Figure 3 This is a schematic diagram of a power distribution transmission system. Detailed Implementation

[0016] To make this utility model more apparent and understandable, preferred embodiments are described in detail below with reference to the accompanying drawings.

[0017] Example 1

[0018] This utility model provides a power distribution transmission system, which is an improvement on the traditional transmission system. It reduces the overall power demand of the machine and ultimately achieves the same overall machine performance with a lower diesel engine displacement and power. This greatly reduces the cost of diesel engine selection and the fuel consumption of the vehicle. The use of the controller makes the movements of the bucket and boom coordinated and improves the work efficiency.

[0019] like Figures 1-3 As shown, this utility model includes an engine 4, a torque converter, a gearbox, one or more hydraulic pumps 2 providing power to the working device, a controller 3, and a measuring device. The torque converter includes a pump impeller 7 and a turbine 1. The engine 4 is connected to the pump impeller 7, and the pump impeller 7 and turbine 1 are connected via a hydraulic transmission system. The turbine 1 is connected to the gearbox. The hydraulic pumps 2 are connected to cylinders via a hydraulic system. The measuring device is used to measure the transmission ratio between the pump impeller 7 and the turbine 1. At least one hydraulic pump 2 is a controllable variable displacement hydraulic pump (i.e., one hydraulic pump 2 is a controllable variable displacement hydraulic pump, and the remaining hydraulic pumps 2 can be fixed displacement pumps; or all hydraulic pumps 2 are controllable variable displacement hydraulic pumps), which can adjust the displacement according to the working conditions to reduce power consumption. The controller 3 has a built-in control program that can be used to control the displacement of the hydraulic pumps 2. The hydraulic pumps 2 are connected to the hydraulic system of the working device (i.e., a bucket, boom, or other machine used on a vehicle), and the hydraulic system controls the movement of the working device. The hydraulic system is equipped with a hydraulic sensor for measuring the hydraulic load feedback pressure.

[0020] In this embodiment, the measuring devices are a pump wheel speed sensor 5 and a turbine speed sensor 6, which measure the rotational speeds of the pump wheel 7 and turbine 1. The pump wheel speed sensor 5 is located on the engine 4 or the pump wheel 7; the turbine speed sensor 6 is located on the turbine 1 or the gearbox. A hydraulic sensor is provided on the cylinder or hydraulic system, and a proportional solenoid valve is provided on the hydraulic pump 2 to control the hydraulic pressure opening; wherein, the flow rate of each proportional solenoid valve can be calculated by current conversion (existing technology).

[0021] Among them, the speed of turbine 1 reflects the speed of the vehicle and the amount of power allocated by engine 4 for driving; the speed of pump wheel 7 reflects the real-time power used by engine 4 (diesel engine); and the displacement of hydraulic pump 2 reflects the power allocated by engine 4 to the working device.

[0022] Controller 3 connects to the torque converter, hydraulic sensor, and proportional solenoid valve. The hydraulic system load information includes the pressure feedback from the hydraulic load measured by the hydraulic sensor and the flow rate calculated from the current flowing through the proportional solenoid valve. The proportional solenoid valve is connected to controller 3 via a signal, and controller 3 controls the opening of the proportional solenoid valve, thereby adjusting the displacement of hydraulic pump 2. The proportional solenoid valve controls the current, thus controlling its opening and consequently the displacement of hydraulic pump 2.

[0023] The transmission system of this utility model can collect the speed information of the pump wheel 7 and turbine 1 and the working load information (obtained through hydraulic sensors and proportional solenoid valves) through the controller 3 according to the working conditions. When the controller 3 collects the speed signals of the pump wheel 7 and turbine 1 through the pump wheel speed sensor 5 and turbine speed sensor 6, the larger the transmission ratio between the turbine 1 speed and the pump wheel 7 speed, the smaller the travel load; the smaller the transmission ratio between the turbine 1 speed and the pump wheel 7 speed, the larger the travel load. Based on the speed signals of the pump wheel 7 and turbine 1, the controller determines whether the transmission ratio (i.e., the torque converter ratio) is greater than the calibrated value. If it is greater than the calibrated value, the hydraulic pump 2 is not adjusted, that is, the power of the hydraulic pump 2 remains unchanged. If it is less than the calibrated value, the controller continues to determine whether the working device is working. If the working device is not working (the working device can be determined by the pressure feedback from the hydraulic load; when the pressure is very small or 0, it is in a non-working state), the controller does not adjust the hydraulic pump 2. If the working device is working, the controller adjusts the displacement of the hydraulic pump 2, thereby adjusting the power of the hydraulic pump 2. For example, a speed transmission ratio of less than 0.5 (i.e., the calibration value) is used to determine traction conditions, requiring conditions with a large load. The calibration value is obtained when the traction force and digging force are balanced, and is derived through repeated experiments.

[0024] Adjust the displacement of hydraulic pump 2 according to the load conditions of the hydraulic system. The formula is as follows:

[0025] The hydraulic system's power consumption is calculated by dividing the pressure (bar) of the hydraulic load feedback by the flow rate (L / min) by 600. This is the power of hydraulic pump 2. The current is then obtained using the formula between power and current. Finally, the proportional solenoid valve is adjusted to the obtained current value to obtain the displacement of hydraulic pump 2. The opening of the proportional solenoid valve is adjusted by controller 3.

[0026] This enables monitoring and power redistribution throughout the machine's operation, eliminating excess power, reducing useless losses, lowering fuel consumption, and reducing the overall power requirements, ultimately achieving the same overall machine performance using a lower diesel engine displacement and power.

[0027] In this invention, the torque converter can also be connected to the pump wheel speed sensor 5 and the turbine speed sensor 6, and replaced with a torque sensor. However, since this invention only requires the transmission ratio between the turbine 1 speed and the pump wheel 7 speed, and does not need to accurately obtain the specific torques, a torque converter is used in this embodiment.

[0028] Example 2

[0029] In this embodiment, the measuring device is a torque sensor. The torque sensor is located on the engine 4, the transmission, or the torque converter. A hydraulic sensor is installed on the cylinder or hydraulic system, and a proportional solenoid valve is installed on the hydraulic pump 2 to control the hydraulic opening. The controller 3 connects the torque sensor, the hydraulic sensor, and the proportional solenoid valve. The hydraulic system load information includes the pressure feedback from the hydraulic load measured by the hydraulic sensor and the flow rate calculated from the current on the proportional solenoid valve.

[0030] Everything else is the same as in Example 1.

Claims

1. A power distribution transmission system, comprising an engine (4), a torque converter, a gearbox, and a hydraulic pump (2) for providing power to a working device, the torque converter comprising a pump impeller (7) and a turbine (1), the engine (4) being connected to the pump impeller (7), the pump impeller (7) and the turbine (1) being connected via a hydraulic transmission system, the turbine (1) being connected to the gearbox, and the hydraulic pump (2) being connected to a cylinder via a hydraulic system, characterized in that, It also includes a measuring device for measuring the transmission ratio between the pump wheel (7) and the turbine (1), at least one hydraulic pump (2) is a controllable variable hydraulic pump with adjustable displacement, and a controller (3) for controlling the displacement of the hydraulic pump (2) based on the transmission ratio between the pump wheel (7) and the turbine (1) and the hydraulic system load information.

2. The power distribution transmission system as described in claim 1, characterized in that, The measuring device is a pump wheel speed sensor (5) and a turbine speed sensor (6) for measuring the rotational speed of the pump wheel (7) and the turbine (1); or the measuring device is a torque sensor.

3. The power distribution transmission system as described in claim 2, characterized in that, The pump wheel speed sensor (5) is located on the engine (4) or pump wheel (7); the turbine speed sensor (6) is located on the turbine (1) or gearbox.

4. The power distribution transmission system as described in claim 2, characterized in that, The cylinder or hydraulic system is equipped with a hydraulic sensor, and the hydraulic pump (2) is equipped with a proportional solenoid valve to control the hydraulic opening. The controller (3) is connected to the torque converter, the hydraulic sensor and the proportional solenoid valve. The hydraulic system load information includes the pressure of the hydraulic load feedback measured by the hydraulic sensor and the flow rate calculated by the current on the proportional solenoid valve.

5. The power distribution transmission system as described in claim 2, characterized in that, The torque sensor is located on the engine (4), gearbox, or torque converter.

6. The power distribution transmission system as described in claim 2, characterized in that, The cylinder or hydraulic system is equipped with a hydraulic sensor, and the hydraulic pump (2) is equipped with a proportional solenoid valve to control the hydraulic opening. The controller (3) is connected to the torque sensor, the hydraulic sensor and the proportional solenoid valve. The hydraulic system load information includes the pressure of the hydraulic load feedback measured by the hydraulic sensor and the flow rate calculated by the current on the proportional solenoid valve.

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