CN103629196B - A kind of vehicle energy-saving device based on engineering machinery hydraulic drive system - Google Patents

Abstract

The object of the present invention is to provide a vehicle energy-saving device based on the hydraulic drive system of construction machinery, including an engine, a hydraulic pump, a three-way valve, a hydraulic motor, a clutch, a generator, a battery, a supercharging device, and a controller. During the loading process, the motor drives the generator to generate electricity and store the electric energy in the battery. A proportional flow valve is connected to the oil circuit at the motor outlet, and a part of the oil is sent to the booster device through the proportional flow valve. Under acceleration or loading conditions , the battery releases electric energy and drives the supercharging device to pressurize the oil, and then the pressurized oil is sent to the main oil circuit through the three-way valve; the pressure sensor connected to the main oil circuit and the rotational speed connected to the output shaft of the motor The sensor sends the collected signal to the controller, and the controller outputs the target current value and the target pressure value to the proportional overflow valve and the booster device after calculation and processing. The invention realizes energy recycling and achieves the effect of energy saving.

Description

A vehicle energy-saving device based on hydraulic drive system of construction machinery

technical field

The invention relates to an energy-saving device, in particular to a vehicle energy-saving device.

Background technique

In today's world, the requirements for energy saving in the construction machinery industry are getting higher and higher, and in the hydraulic system, there are many places that can be improved. During the deceleration or load reduction process of the vehicle, a large part of energy is often lost due to friction. In real equipment, we often use this part of energy to generate electricity with a generator and store it in the battery in the form of electric energy, so that Energy is recycled. In the hydraulic drive system, after the motor does work, the hydraulic oil discharged from its oil outlet still has a certain pressure energy, and this part of the pressure energy is often lost because the oil is directly discharged into the oil tank, resulting in a certain amount of energy. waste. During the working process of the vehicle, the load is not fixed, it is often loaded or unloaded, and the vehicle starts to accelerate or brake to decelerate. In the existing technology, people often change the speed of the engine or change the pump displacement, motor Displacement is used to match the output torque and power of the motor with the load, so that the whole machine can work smoothly and harmoniously, but this method requires a long time for regulation and operation, and often changing the speed of the diesel engine will make the diesel engine unable to work stably. Moreover, the economy and fuel consumption become worse, and changing the displacement of the pump and the motor frequently will reduce the life of the pump and the motor, and cause energy loss due to the continuous conversion of energy. Therefore, it is necessary to recycle the directly lost energy, and at the same time find new ways to avoid unnecessary energy loss, so that the energy utilization rate of the entire hydraulic system can be improved, so as to achieve the purpose of energy saving.

Contents of the invention

The object of the present invention is to provide a vehicle energy-saving device based on a hydraulic drive system of a construction machine, which recycles the energy directly lost during vehicle travel.

The purpose of the present invention is achieved like this:

The invention is a vehicle energy-saving device based on the hydraulic drive system of construction machinery, which is characterized in that: engine, generator, booster, battery, hydraulic pump, hydraulic motor, clutch, controller, the output shaft of the engine is connected with the hydraulic pump and Drive the hydraulic pump to absorb hydraulic oil from the oil tank, and the absorbed hydraulic oil enters the hydraulic motor from the main oil circuit. The hydraulic motor drives the load to do work under the drive of the hydraulic oil. The load is connected to the generator through the clutch, and the generator is connected to the battery. The hydraulic motor is connected to the booster device through the first branch. A proportional flow valve is installed on the first branch. The proportional flow valve is connected to the controller. A three-way valve is installed on the main oil circuit. In the second branch, the supercharging device is connected to the three-way valve through the second branch; during the acceleration or loading process of the vehicle, part of the hydraulic oil in the hydraulic motor enters the supercharging device through the first branch, and the battery drives the supercharging device to The hydraulic oil is pressurized, and after the hydraulic oil is pressurized, it flows back to the main oil circuit through the second branch.

The present invention may also include:

1. A pressure sensor is installed at the outlet of the hydraulic pump, and the pressure sensor transmits the collected pressure information to the controller; a speed sensor is installed on the output shaft of the hydraulic motor, and the speed sensor transmits the collected speed information to the controller.

2. After the controller obtains the pressure information and speed information, it outputs the target pressure value to the booster device and the current value to the proportional flow valve, thereby controlling the opening amount of the proportional flow valve and the hydraulic oil flow into the booster device.

3. During the deceleration or load reduction process of the vehicle, the current value output by the controller to the proportional flow valve is zero.

The advantage of the present invention is that: in the energy-saving device, the excess energy of the vehicle during deceleration or load reduction is collected in the form of electric energy, stored in the battery, and released when the vehicle is accelerated or loaded to drive the supercharging device The oil is pressurized, so that this part of the energy has been recycled. When the vehicle is accelerating or loading, a certain flow of oil from the motor is boosted in the supercharging device and then sent to the main oil circuit through the three-way valve, thereby increasing the flow into the motor and increasing the output power of the hydraulic motor to reach The purpose of acceleration avoids the need to adjust the engine speed or pump displacement and motor displacement in the traditional vehicle acceleration or load control, shortens the system response time, and also makes the diesel engine speed fluctuate less, and always maintains an economical level. Within the range of working conditions, the fuel consumption is reduced and the economy is enhanced; the range of displacement of the pump motor is also reduced, the service life of the pump motor is increased, and the energy loss caused by the continuous conversion of energy in the traditional adjustment process is reduced. ; The energy that was originally directly lost is recycled, the fuel consumption of the diesel engine is reduced, the energy utilization rate of the entire system is improved, and the effect of energy saving is achieved.

Description of drawings

Fig. 1 is a structural schematic diagram of the present invention.

detailed description

The present invention is described in more detail below in conjunction with accompanying drawing example:

1, the present invention is mainly composed of the following parts: engine 1, hydraulic pump 2, three-way valve 3, hydraulic motor 4, load 5, clutch 6, generator 7, battery 8, booster 9, proportional flow Valve 10, controller 11, pressure sensor 12 and speed sensor 13. It is characterized in that: as shown in Figure 1, the engine 1 is connected to the hydraulic pump 2 through the output shaft, and the hydraulic pump 2 is driven to rotate to absorb hydraulic oil from the oil tank. The hydraulic oil enters the hydraulic motor 4 from the main oil circuit, and the hydraulic motor 4 rotates under the drive of the oil to drive the load 5 to do work; the load 5 is connected to the generator 7 through the clutch 6, and the generator 7 is connected to the battery 8. During the deceleration or load reduction process of the vehicle, the clutch 6 is connected, The motor 4 drives the generator 7 to generate electricity, so that the excess energy is stored in the battery 8 in the form of electric energy, and the current value output by the controller 11 to the proportional flow valve 10 is zero; during the acceleration or loading of the vehicle, a part of the hydraulic motor 4 The oil goes through the proportional flow valve 10 and enters the supercharging device 9. The electric energy in the battery 8 drives the supercharging device 9 to supercharge the oil entering it. The specific supercharging degree is determined by the target pressure signal output by the controller 11. , after the oil is pressurized, it enters the main oil circuit through the three-way valve 3, thereby increasing the flow into the hydraulic motor 4, increasing the output power of the hydraulic motor 4, so as to meet its matching with the load 5; the hydraulic pump 2 The pressure sensor 12 at the outlet transmits the collected pressure value to the controller 11, and the speed sensor 13 on the output shaft of the hydraulic motor 4 transmits the collected rotational speed value to the controller 11, and the controller 11 increases the pressure value after calculation and processing. The pressure device 9 outputs its target pressure value, and outputs its current value to the proportional flow valve 10, thereby controlling the opening amount of the valve 10 and the oil flow rate entering the booster device 9.

In the process of deceleration or load reduction, the current value output by the controller 11 to the proportional flow valve 10 is zero, and the system is still regulated by traditional methods such as overflow or displacement adjustment.

The hydraulic system energy-saving device of the present invention includes an engine 1, a hydraulic pump 2, a three-way valve 3, a hydraulic motor 4, a load 5, a clutch 6, a generator 7, a battery 8, a booster 9, a proportional flow valve 10, and a controller 11 , Pressure sensor 12 and speed sensor 13. The output shaft of the engine 1 is connected to the hydraulic pump 2, the hydraulic pump 2 is connected to the main oil circuit, there is a three-way valve 3 on the main oil circuit, the motor 4 is connected to the main oil circuit and the load 5, and the load 5 is connected to the generator 7 through the clutch 6 During the deceleration or load reduction process of the vehicle, the clutch 6 is connected, the motor 4 drives the generator 1 to generate electricity, and the generated electric energy is stored in the battery 8, which is connected to the supercharging device 9, and the supercharging device 9 is connected to the proportional flow rate The valve 10 and the three-way valve 3 are connected to the controller 11, the proportional flow valve 10 is connected to the oil outlet of the hydraulic motor 4 and the controller 11, the three-way valve 3 is connected to the main oil circuit, the controller 11 is connected to the speed sensor 13 and the pressure Sensor 12 is connected.

The proportional flow valve 10 is connected to the hydraulic motor 4 and the supercharging device 9, and when the vehicle is accelerating or loading, a part of the oil output from the hydraulic motor 4 enters the supercharging device 9 through the proportional flow valve 10;

The supercharging device 9 is connected with the battery 8 and the three-way valve 3, and the electric energy of the battery 8 drives the supercharging device 9 to pressurize the oil liquid entering it, and the degree of supercharging depends on the target pressure value output by the controller 11, and then The hydraulic oil compressed to a certain pressure is sent to the three-way valve 3 and enters the main oil circuit, so that it is sent to the hydraulic motor 4 together with the hydraulic oil output from the hydraulic pump 2, so that the flow rate of the hydraulic motor 4 increases, thereby Make its output power increase, and match with load 5.

The controller 11 is connected with the speed sensor 13, the pressure sensor 12, the proportional current valve 10 and the booster 9, the speed sensor 13 is connected to the output shaft of the hydraulic motor 4 to collect the rotational speed of the motor 4, and then sends the collected signal to The controller 11 and the pressure sensor 12 are connected to the main oil circuit, collect the pressure value of the high-pressure oil circuit, and then send the collected signal to the controller 11, and the controller 11 outputs the target pressure value to the booster device 9 after calculation and processing. A certain current value is output to the proportional flow valve 10 so as to adjust the area of the valve port, so that the corresponding flow of oil enters the booster device 9 .

During the acceleration or loading process, the current value output by the controller 11 to the proportional current valve 10 is not zero; during the deceleration or load reduction process, the current value output by the controller 11 to the proportional flow valve 10 is zero, and the traditional method is still adopted. Adjust by means of overflow or adjusting displacement.

Claims (4)

1. A vehicle energy-saving device based on engineering machinery hydraulic drive system, characterized in that: engine, generator, booster, battery, hydraulic pump, hydraulic motor, clutch, controller, the output shaft of the engine is connected to the hydraulic pump and Drive the hydraulic pump to absorb hydraulic oil from the oil tank, and the absorbed hydraulic oil enters the hydraulic motor from the main oil circuit. The hydraulic motor drives the load to do work under the drive of the hydraulic oil. The load is connected to the generator through the clutch, and the generator is connected to the battery. The hydraulic motor is connected to the booster device through the first branch. A proportional flow valve is installed on the first branch. The proportional flow valve is connected to the controller. A three-way valve is installed on the main oil circuit. In the second branch, the supercharging device is connected to the three-way valve through the second branch; during the acceleration or loading process of the vehicle, part of the hydraulic oil in the hydraulic motor enters the supercharging device through the first branch, and the battery drives the supercharging device to The hydraulic oil is pressurized, and after the hydraulic oil is pressurized, it flows back to the main oil circuit through the second branch. 2. A vehicle energy-saving device based on a construction machinery hydraulic drive system according to claim 1, wherein a pressure sensor is installed at the outlet of the hydraulic pump, and the pressure sensor transmits the collected pressure information to the controller; the hydraulic motor A speed sensor is installed on the output shaft of the motor, and the speed sensor transmits the collected rotational speed information to the controller. 3. A vehicle energy-saving device based on a construction machinery hydraulic drive system according to claim 2, characterized in that: after the controller acquires pressure information and speed information, it outputs the target pressure value to the booster device, and outputs the target pressure value to the proportional flow valve Current value, so as to control the opening of the proportional flow valve and the hydraulic oil flow into the booster device. 4. A vehicle energy-saving device based on a construction machinery hydraulic drive system according to any one of claims 1-3, wherein the current value output by the controller to the proportional flow valve is zero.