Electric hydraulic lifting system of new energy vehicle

Abstract

The new energy vehicle electric hydraulic lifting system comprises a hydraulic oil tank, a PT type lifting valve, a permanent magnet synchronous motor, a gear pump and a frequency converter, the PT type lifting valve, the frequency converter and a motor base are sequentially installed on the top of the hydraulic oil tank from left to right, and an oil inlet is formed in one side of the PT type lifting valve; cushion block shock absorbers are installed at the four corners of the top of the motor base, a permanent magnet synchronous motor is installed at the tops of the cushion block shock absorbers, and the output end of the permanent magnet synchronous motor is connected to the driving end of the gear pump; aiming at a new energy vehicle without chassis power takeoff, a permanent magnet synchronous motor is adopted to be integrated with a hydraulic oil tank, a PT type lifting valve and the like, and a modularized lifting system power source is achieved. The high-power hydraulic lifting requirement can be met, the large-tonnage lifting requirement is met, and perfect replacement with an original hydraulic lifting system is achieved. The compact chassis space requirement of an existing new energy vehicle model is met, and the hydraulic system is more integrated.

Description

Technical Field

[0001] The present invention relates to the technical field of electric hydraulic lifting for new energy vehicles, and specifically to an electric hydraulic lifting system for new energy vehicles. Background Art

[0002] Existing new energy vehicles have an electric motor as the core, and the power is directly driven by the battery to the motor. The chassis space is usually occupied by the battery pack, the motor, and the electronic control system, and the mechanical installation space required for the traditional PTO is limited. The traditional hydraulic lifting system needs to rely on the power take-off to provide power to drive the gear pump to deliver high-pressure oil to the hydraulic lifting system.

[0003] With the rapid development of new energy vehicles, pure electric and hybrid models have gradually become the mainstream in the commercial vehicle field. Different from traditional fuel vehicles, new energy vehicles use an electric motor as the core power source, and the chassis space is usually highly occupied by the battery pack, the motor, and the electronic control system, resulting in severe challenges for the installation of traditional hydraulic lifting systems. The traditional hydraulic lifting system relies on a power take-off (PTO) to obtain power from the engine, driving the gear pump to generate high-pressure oil to drive the cylinder to complete the lifting action. However, new energy vehicles lack an internal combustion engine and a traditional transmission system, and the mechanical installation space required for the power take-off is greatly compressed by the battery pack, making it difficult to adapt the traditional hydraulic lifting solution to new energy vehicle models.

[0004] In existing alternative solutions, some attempts have been made to use an electric hydraulic pump to replace the mechanical power take-off, but there are still significant defects. For example, an independent electric pump system usually requires additional configuration of a motor and a fuel tank, occupying a large amount of chassis space and having low integration, making it difficult to meet the requirements of new energy vehicles for a compact layout; at the same time, a low-power motor is difficult to support the lifting requirements of large tonnages, restricting its application in heavy vehicles. In addition, the traditional hydraulic system relies on a pneumatic control reversing valve, which requires the introduction of the main vehicle air source, increasing the system complexity and failure risk, and having insufficient intelligent control ability, unable to meet the requirements of new energy vehicles for electronic control integration.

[0005] Therefore, there is an urgent need for an electric hydraulic lifting system with high integration and adapted to the power architecture of new energy vehicles to solve problems such as space occupation, insufficient power, and backward control methods of traditional solutions. Through innovative design, the present invention integrates a permanent magnet synchronous motor, a hydraulic pump valve, and a frequency converter into the hydraulic oil tank, directly driven by the vehicle's high-voltage power supply, while achieving large-tonnage lifting, meeting the space constraints and intelligent control requirements of new energy vehicle chassis, and having significant industrial application value. Summary of the Invention

[0006] The purpose of the present invention is to provide an electric hydraulic lifting system for new energy vehicles to solve the problems raised in the above background art.

[0007] To achieve the above object, the present invention provides the following technical solutions: An electro-hydraulic lifting system for a new energy vehicle, comprising:

[0008] A hydraulic oil tank for storing hydraulic oil;

[0009] An integrated power unit fixed on the top of the hydraulic oil tank, including a permanent magnet synchronous motor, a hydraulic pump, a reversing valve and a frequency converter. The permanent magnet synchronous motor is directly driven and connected to the hydraulic pump, and the reversing valve is connected to the hydraulic pump and the hydraulic cylinder through a hydraulic pipeline;

[0010] An electronic control module includes a vehicle-mounted controller, which is respectively connected to the vehicle-mounted high-voltage power supply, the vehicle-mounted low-voltage power supply and the permanent magnet synchronous motor, and is used to receive external instructions and output three-phase alternating current to drive the permanent magnet synchronous motor;

[0011] A shock absorption device is arranged between the permanent magnet synchronous motor and the hydraulic oil tank, and is used to suppress the vibration transmission during the operation of the motor;

[0012] The system directly uses the vehicle's high-voltage power supply to drive through the integrated power unit, realizing modular control of the hydraulic lifting action.

[0013] Further, the reversing valve is a PT-type lifting valve, its oil inlet is connected to the output end of the hydraulic pump through a hydraulic hose, and the input end of the hydraulic pump is connected to the oil outlet at the bottom of the hydraulic oil tank through a hydraulic hose.

[0014] Further, an air filter is installed on one side of the top of the hydraulic oil tank for filtering the air entering the tank.

[0015] Further, mounting plates are provided at both ends of the bottom of the hydraulic oil tank for fixing the hydraulic oil tank to the vehicle chassis.

[0016] Further, the permanent magnet synchronous motor is connected to the vehicle's 380V AC power supply and speed control is achieved through a frequency converter.

[0017] Further, the electronic control module includes an emergency stop button, which is signal-connected to the vehicle-mounted controller and is used to cut off the power supply of the permanent magnet synchronous motor emergently.

[0018] Further, the shock absorption device is a pad shock absorber, which is symmetrically arranged at the four corners of the mounting base of the permanent magnet synchronous motor.

[0019] Compared with the prior art, the beneficial effects of the present invention are:

[0020] (1) High integration and compact layout. By integrating the permanent magnet synchronous motor, hydraulic pump valve, frequency converter and controller on the hydraulic oil tank, the system occupied space is greatly reduced, adapting to the compact layout requirements of the chassis battery pack, motor and electronic control system of new energy vehicles, and solving the problem that the traditional hydraulic lifting system cannot be installed due to relying on a power take-off.

[0021] (2) High power and large tonnage lifting capacity. The permanent magnet synchronous motor is directly used to drive the hydraulic system, which is matched with high-voltage and high-power output to meet the large-tonnage lifting requirements of heavy vehicles and break through the limitation of insufficient power of traditional electric hydraulic pumps.

[0022] (3) Intelligence and electric control integration. It is powered by the vehicle's high-voltage power supply, and the accurate start-stop, speed regulation and emergency stop control of the motor are realized through the controller, supporting intelligent operation; at the same time, the traditional pneumatic control reversing valve is abandoned, eliminating the dependence on the main vehicle air source, simplifying the system structure, reducing the risk of failure and improving the control reliability.

[0023] (4) Modularity and compatibility. The system adopts a modular design, which is convenient for integration with the existing electric control platform of new energy vehicles, supports rapid installation and maintenance, provides a standardized and expandable solution for vehicle manufacturers, and helps the flexible adaptation of the upper-mounted equipment.

[0024] (5) High-efficiency energy utilization. It directly uses the on-vehicle 380V alternating current to drive, without the need to configure an additional independent power source, reducing energy conversion losses, improving energy utilization efficiency, and conforming to the development trend of electrification and energy conservation of new energy vehicles. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 is the official axonometric view of the present invention;

[0026] Figure 2 is the rear axonometric view of the present invention;

[0027] Figure 3 is the partial structural schematic diagram of the present invention;

[0028] Figure 4 is the bottom axonometric view of the present invention;

[0029] Figure 5 is the control schematic diagram of the present invention.

[0030] In the figure: 1, hydraulic oil tank; 2, PT type lifting valve; 3, oil inlet; 4, permanent magnet synchronous motor; 5, gear pump; 6, air filter; 7, pad shock absorber; 8, motor base; 9, frequency converter; 10, hydraulic oil tank mounting plate; 11, oil outlet. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0031] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention.

[0032] Please refer to Figures 1-5, the present invention provides an electro-hydraulic lifting system for new energy vehicles, including a hydraulic oil tank 1, a PT type lifting valve 2, a permanent magnet synchronous motor 4, a gear pump 5 and an inverter 9. On the top of the hydraulic oil tank 1, a PT type lifting valve 2, an inverter 9 and a motor base 8 are installed in sequence from left to right. An oil inlet 3 is provided on one side of the PT type lifting valve 2. Four corners of the top of the motor base 8 are each installed with a pad shock absorber 7, and a permanent magnet synchronous motor 4 is installed on the top of the pad shock absorber 7. The output end of the permanent magnet synchronous motor 4 is connected to the driving end of the gear pump 5. An oil outlet 11 is provided at the bottom of the hydraulic oil tank 1, and the oil outlet 11 is connected to the input end of the gear pump 5 through a hydraulic hose. The output end of the gear pump 5 is connected to the oil inlet 3 through a hydraulic hose.

[0033] An air filter 6 is installed on one side of the top of the hydraulic oil tank 1. The air filter 6 is provided to filter impurities and dust, and avoid the air entering the hydraulic oil tank 1 containing impurities and dust.

[0034] Hydraulic oil tank mounting plates 10 are installed at both ends of the bottom of the hydraulic oil tank 1. The hydraulic oil tank mounting plates 10 are used to install the hydraulic oil tank 1 at a designated position on the new energy vehicle.

[0035] The permanent magnet synchronous motor 4 is connected to 380V alternating current, so that the permanent magnet synchronous motor 4 can use the 380V alternating current owned by the whole vehicle. The permanent magnet synchronous motor 4 is connected to the vehicle-mounted controller, and the vehicle-mounted controller is respectively connected to the vehicle-mounted high-voltage power supply and the vehicle-mounted low-voltage power supply. The vehicle-mounted high-voltage power supply supplies high-voltage direct current to the vehicle-mounted controller, and the vehicle-mounted low-voltage power supply supplies 12V direct current to the vehicle-mounted controller. The vehicle-mounted controller outputs three-phase alternating current to drive the permanent magnet synchronous motor 4. An external switch button is used to start / stop the permanent magnet synchronous motor 4, and an emergency stop button is used for emergency shutdown to realize the lifting, lowering and mid-stop actions of the oil cylinder.

[0036] During specific use, in practical applications, first, the motor base 8 is installed on the hydraulic oil tank 1, and the permanent magnet synchronous motor 4 is fixedly installed on the motor base 8 through the pad shock absorber 7 to ensure firm installation. The pad shock absorber 7 reduces the vibration transmission during motor operation.

[0037] The permanent magnet synchronous motor 4 and the gear pump 5 are connected for power transmission by means of shaft connection or the like to ensure the stability of power transmission. The permanent magnet synchronous motor 4 is connected to the 380V alternating current of the whole vehicle. The vehicle-mounted high-voltage power supply provides high-voltage direct current for the vehicle-mounted controller, and the vehicle-mounted low-voltage power supply provides 12V direct current for the vehicle-mounted controller.

[0038] The vehicle-mounted controller is controlled by an external switch button, so that the vehicle-mounted controller outputs three-phase alternating current to drive the permanent magnet synchronous motor 4, thereby driving the gear pump 5 to work. The high-pressure oil output by the gear pump 5 enters the hydraulic system through a hydraulic hose. The PT-type lift valve 2 is installed on the hydraulic oil tank 1 and is connected to the hydraulic system through a hydraulic pipeline to realize the commutation action of the hydraulic lift system, and further control the lifting, lowering and mid-stop of the oil cylinder.

[0039] When an emergency stop is required, press the emergency stop button, the vehicle-mounted controller stops outputting three-phase alternating current, and the permanent magnet synchronous motor 4 stops working, realizing an emergency stop to ensure the safety of the vehicle and personnel.

[0040] Although the present invention has been described in detail with reference to the foregoing embodiments, for those skilled in the art, they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. An electric hydraulic lifting system for a new energy vehicle, characterized in that, Comprising: A hydraulic oil tank (1) for storing hydraulic oil; An integrated power unit fixed to the top of the hydraulic oil tank (1), including a permanent magnet synchronous motor (4), a hydraulic pump (5), a reversing valve (2) and an inverter (9), wherein the permanent magnet synchronous motor (4) is directly drivingly connected to the hydraulic pump (5), and the reversing valve (2) is communicated with the hydraulic pump (5) and a hydraulic cylinder through a hydraulic pipeline; An electronic control module, including a vehicle-mounted controller, which is respectively connected to a vehicle-mounted high-voltage power supply, a vehicle-mounted low-voltage power supply and the permanent magnet synchronous motor (4), and is used for receiving external instructions and outputting three-phase alternating current to drive the permanent magnet synchronous motor (4); A shock absorption device (7) arranged between the permanent magnet synchronous motor (4) and the hydraulic oil tank (1) for suppressing the vibration transmission during motor operation; The system is directly driven by the vehicle's high-voltage power supply through the integrated power unit to realize modular control of the hydraulic lifting action.

2. The electric hydraulic lifting system for new energy vehicles according to claim 1, wherein The reversing valve (2) is a PT-type lifting valve, and its oil inlet (3) is connected to the output end of the hydraulic pump (5) through a hydraulic hose, and the input end of the hydraulic pump (5) is connected to the oil outlet (11) at the bottom of the hydraulic oil tank (1) through a hydraulic hose.

3. The electric hydraulic lifting system for a new energy vehicle according to claim 1 or 2, characterized in that, An air filter (6) is installed on one side of the top of the hydraulic oil tank (1) for filtering the air entering the tank.

4. The electric hydraulic lifting system for a new energy vehicle according to claim 1, characterized in that, Mounting plates (10) are provided at both ends of the bottom of the hydraulic oil tank (1) for fixing the hydraulic oil tank (1) to the vehicle chassis.

5. The electric hydraulic lifting system for new energy vehicles according to claim 1, characterized in that The permanent magnet synchronous motor (4) is connected to the vehicle's 380V AC power supply and speed control is achieved through the inverter (9).

6. The electric hydraulic lifting system for a new energy vehicle according to claim 1, wherein, The electronic control module includes an emergency stop button, which is signal-connected to the vehicle-mounted controller and is used for emergently cutting off the power supply of the permanent magnet synchronous motor (4).

7. The electric hydraulic lifting system for a new energy vehicle according to claim 1, characterized in that, The shock absorption device (7) is a pad shock absorber, symmetrically arranged at the four corners of the mounting base (8) of the permanent magnet synchronous motor (4).

Images