Motor braking energy consumption device and method, electric construction machine

Abstract

The application discloses a motor braking energy consumption device and method and an electric engineering machinery, which, after the power battery is fully charged, controls the power battery to output electric energy to an oil pump motor controller, so that the oil pump motor drives the oil pump to operate; since the working device is in a locked state at this time, the hydraulic oil extracted from the hydraulic oil tank by the oil pump can only overflow back to the hydraulic oil tank through a hydraulic valve, and motor braking energy is converted into the heat of the hydraulic oil, so that the hydraulic oil is cooled through a hydraulic oil cooling device, the motor braking feedback electric energy can be quickly consumed, the battery is effectively prevented from being damaged due to overcharge, the volume of the hydraulic oil tank of the electric engineering machinery is large, the heat capacity of the hydraulic oil is large, the motor braking energy can be fully consumed, the braking energy consumption demand of a long-time continuous braking condition can be met, and the safety and reliability are higher; the independent hydraulic system of the electric engineering machinery is fully utilized, and a special cooling device does not need to be additionally designed.

Description

Technical Field

[0001] The present invention relates to the technical field of electric engineering machinery, and in particular, to a motor braking energy consumption device and method, and in particular, to an electric engineering machinery using the motor braking energy consumption device. Background Art

[0002] At present, electric drive technology has been widely used in engineering machinery fields such as mining, agricultural machinery, and high-altitude machinery. The main drive forms include: central motor layout, electric drive axle, and wheel-side drive. Generally, the mechanical friction brake in the form of central motor layout and electric drive axle is integrated on the vehicle axle, and the mechanical friction brake of wheel-side drive is built into the reducer. Considering the harsh braking conditions of engineering machinery, no matter which electric drive form is used, additional cooling devices must be added to dissipate heat from the braking device. Therefore, the main braking condition of electric engineering machinery can be achieved by using motor braking technology to convert the braking kinetic energy of the equipment into electrical energy. On the one hand, it can reduce the use of mechanical friction brakes and reduce the loss and temperature rise of mechanical friction brakes. On the other hand, the braking energy can be recharged to the battery to extend the battery life. However, when the battery of the equipment is fully charged, the excessive amount of electricity generated by the motor braking during the descent of a long slope will cause the battery to be overcharged and damaged. Therefore, it is necessary to consume the motor braking energy when necessary. There are mainly three existing motor braking energy consumption technologies:

[0003] Method 1: Utilizing the working motor. This method utilizes the working motor's low-efficiency operation or its pure resistance to dissipate the motor's braking energy, converting it into heat. For example, see patent CN113799613A. This method is suitable for small-tonnage electric industrial vehicles used for short-distance transport. However, for large-tonnage construction machinery operating in harsh conditions, the motor's braking feedback is high, and relying solely on the working motor's heat generation cannot fully dissipate the braking energy, shortening the working motor's lifespan or even causing it to burn out.

[0004] Method 2: Using a brake resistor. Excess motor braking energy is dissipated through a brake resistor. This method is simple, but the brake resistor is bulky and requires a dedicated cooling device, which results in tight equipment layout space and increased costs.

[0005] Method 3: Disable motor braking. When the battery is fully charged, the motor controller sends a "disable click braking" command to the motor, disabling the motor's braking function and disabling braking energy recovery. Once the motor brake fails, mechanical friction braking takes over. Prolonged braking can cause the brake system to overheat and fail, requiring additional cooling equipment. This reduces equipment layout space and increases costs. Summary of the Invention

[0006] The present invention provides a motor braking energy consumption device and method, and an electric engineering machine, which can effectively prevent battery overcharge damage, can meet the braking energy consumption requirements of long-term continuous braking conditions, have higher safety and reliability, and do not require the additional design of a special cooling device.

[0007] According to one aspect of the present invention, a motor braking energy consumption device is provided, which is suitable for electric engineering machinery with an independent hydraulic system, including a brake pedal, a vehicle controller, a travel motor, a travel motor controller, a power battery, an oil pump motor controller, an oil pump, a hydraulic valve, a hydraulic oil cooling device and a hydraulic oil tank, wherein the vehicle controller is electrically connected to the brake pedal, the travel motor controller, the power battery and the hydraulic oil cooling device, the travel motor controller is electrically connected to the travel motor and the power battery respectively, the power battery is electrically connected to the oil pump motor controller, the oil pump motor controller is electrically connected to the oil pump motor, the oil pump motor is drivingly connected to the oil pump, the oil pump is respectively connected to the hydraulic oil tank and the working device, when consuming the motor braking energy, the working device is in a locked state, the hydraulic valve and the hydraulic oil cooling device are arranged on the return oil pipeline connecting the oil pump and the hydraulic oil tank, and the hydraulic valve has a pressure relief and overflow function;

[0008] After collecting the braking signal from the brake pedal, the vehicle controller also obtains the power information of the power battery. When the power of the power battery reaches a preset power threshold, the vehicle controller controls the driving motor controller to charge the power battery, and at the same time controls the power battery to output electrical energy to the oil pump motor controller, so that the oil pump motor drives the oil pump to operate, and the hydraulic oil drawn from the hydraulic oil tank by the oil pump overflows back into the hydraulic oil tank through the hydraulic valve to convert the motor braking energy into hydraulic oil heat, and the hydraulic oil cooling device is controlled to start working to dissipate heat from the hydraulic oil.

[0009] Furthermore, it also includes a brake resistor arranged in the hydraulic oil tank, which is electrically connected to the power battery. The vehicle controller obtains the power information of the power battery and the motor braking feedback power information of the driving motor controller. When the motor braking feedback power is not greater than the rated operating power of the oil pump motor, the power battery is controlled to output electric energy only to the oil pump motor controller. When the motor braking feedback power is greater than the rated operating power of the oil pump motor, the power battery is controlled to output electric energy to the oil pump motor controller and the brake resistor at the same time. The oil pump motor operates at the rated operating power, and the brake resistor converts the remaining motor braking energy into hydraulic oil heat.

[0010] Furthermore, when the motor braking feedback power is not greater than the rated operating power of the oil pump motor, the power consumption of the oil pump motor is adjusted by controlling the speed of the oil pump motor or the overflow pressure of the hydraulic valve, wherein the power consumption of the oil pump motor is calculated as follows:

[0011]

[0012] Among them, P - represents the power consumption of the oil pump motor, p represents the overflow pressure of the hydraulic valve, Q represents the output flow of the oil pump, Q=q×n, q represents the displacement of the oil pump, n represents the speed of the oil pump, and η1 represents the efficiency of the oil pump.

[0013] Furthermore, a temperature sensor is provided in the hydraulic oil tank, and the temperature sensor is electrically connected to the vehicle controller. The vehicle controller is used to control the hydraulic oil cooling device to start working when the temperature sensor detects that the hydraulic oil temperature in the hydraulic oil tank reaches a preset temperature threshold.

[0014] Furthermore, when the power level of the power battery does not reach a preset power threshold, the vehicle controller only controls the driving motor controller to charge the power battery.

[0015] In addition, the present invention also provides a motor braking energy consumption method, which uses the motor braking energy consumption device as described above, and includes the following contents:

[0016] After collecting the braking signal, the power battery information is obtained;

[0017] The current power level of the power battery is compared with the preset power threshold. If the current power level of the power battery reaches the preset power threshold, the driving motor controller is controlled to charge the power battery, and the power battery is controlled to output power to the oil pump motor controller.

[0018] Furthermore, after collecting the designated signal, the motor braking feedback power information of the driving motor controller is also obtained. When the motor braking feedback power is not greater than the rated operating power of the oil pump motor, the power battery is controlled to output electric energy only to the oil pump motor controller. When the motor braking feedback power is greater than the rated operating power of the oil pump motor, the power battery is controlled to output electric energy to the oil pump motor controller and the brake resistor at the same time.

[0019] Furthermore, when the motor brake feedback power is not greater than the rated operating power of the oil pump motor, the power consumption of the oil pump motor is adjusted by controlling the speed of the oil pump motor or the overflow pressure of the hydraulic valve. The power consumption of the oil pump motor is calculated as follows:

[0020]

[0021] Among them, P- represents the power consumption of the oil pump motor, p represents the overflow pressure of the hydraulic valve, Q represents the output flow of the oil pump, Q=q×n, q represents the displacement of the oil pump, n represents the speed of the oil pump, and η1 represents the efficiency of the oil pump.

[0022] Furthermore, it also includes the following:

[0023] The hydraulic oil temperature in the hydraulic oil tank is monitored, and when it is detected that the hydraulic oil temperature in the hydraulic oil tank reaches a preset temperature threshold, the hydraulic oil cooling device is controlled to start working.

[0024] In addition, the present invention also provides an electric engineering machine, which adopts the motor braking energy consumption device as described above.

[0025] The present invention has the following beneficial effects:

[0026] The motor braking energy consumption device of the present invention, when the power battery is fully charged, controls the power battery to output electrical energy to the oil pump motor controller, causing the oil pump motor to drive the oil pump. Since the working device is locked at this time, the hydraulic oil drawn from the hydraulic oil tank by the oil pump can only overflow back into the hydraulic oil tank through the hydraulic valve, thereby converting the motor braking energy into hydraulic oil heat, so that the hydraulic oil can be dissipated by the hydraulic oil cooling device of the independent hydraulic system. This device can quickly consume the motor braking feedback electrical energy, effectively preventing battery overcharge damage. Moreover, the hydraulic oil tank of the electric engineering machinery is large in volume and has a large heat capacity of the hydraulic oil, which can fully consume the motor braking energy, thereby meeting the braking energy consumption requirements of long-term continuous braking conditions, and has higher safety and reliability. It fully utilizes the hydraulic oil tank and hydraulic oil cooling device of the electric engineering machinery, eliminating the need for the design of a special cooling device.

[0027] In addition to the above-described objects, features and advantages, the present invention has other objects, features and advantages. The present invention will be further described in detail below with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The accompanying drawings, which constitute part of this application, are intended to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are intended to explain the present invention and do not constitute an undue limitation of the present invention. In the accompanying drawings:

[0029] Figure 1 It is a schematic diagram of the electrical connection principle of the motor braking energy consumption device of the preferred embodiment of the present application.

[0030] Figure 2 This is a schematic diagram of the first motor braking energy transmission route of the preferred embodiment of the present application.

[0031] Figure 3This is a schematic diagram of the second motor braking energy transmission route of the preferred embodiment of the present application.

[0032] Figure 4 This is a schematic diagram of the third motor braking energy transmission route of the preferred embodiment of the present application.

[0033] Figure 5 It is a flow chart of a motor braking energy consumption method according to another embodiment of the present application.

[0034] Figure 6 This is another flow chart of a motor braking energy consumption method according to another embodiment of the present application.

[0035] Description of Reference Numerals

[0036] 1. Brake pedal; 2. Vehicle controller; 3. Travel motor; 4. Travel motor controller; 5. Power battery; 6. Brake resistor; 7. Oil pump motor controller; 8. Oil pump motor; 9. Oil pump; 10. Working device; 11. Hydraulic valve; 12. Hydraulic oil cooling device; 13. Hydraulic oil tank. DETAILED DESCRIPTION

[0037] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments in this application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0038] Reference Figure 1The preferred embodiment of the present application provides a motor braking energy consumption device, which is suitable for electric engineering machinery with an independent hydraulic system. The independent hydraulic system can provide hydraulic power for the working device 10 without affecting the driving function. Among them, the motor braking energy consumption device specifically includes a brake pedal 1, a vehicle controller 2, a traveling motor 3, a traveling motor controller 4, a power battery 5, an oil pump motor controller 7, an oil pump motor 8, an oil pump 9, a hydraulic valve 11, a hydraulic oil cooling device 12 and a hydraulic oil tank 13. The vehicle controller 2 is electrically connected to the brake pedal 1, the traveling motor controller 4, the power battery 5 and the hydraulic oil cooling device 12. The traveling motor controller 4 is electrically connected to the traveling motor 3 and the power battery 5 respectively. The power battery 5 is electrically connected to the oil pump motor controller 7. The oil pump motor controller 7 is electrically connected to the oil pump motor 8. The oil pump motor 8 is drive-connected to the oil pump 9. The oil pump 9 is respectively connected to the hydraulic oil tank 13 and the working device 10. When consuming the motor braking energy, the working device 10 is in a locked state. The hydraulic valve 11 and the hydraulic oil cooling device 12 are arranged on the return oil pipeline connecting the oil pump 9 and the hydraulic oil tank 13. The hydraulic valve 11 has a pressure relief and overflow function. The brake pedal 1 is used to generate a braking signal. When the driver's foot is applied to the brake pedal 1, the vehicle controller 2 collects the braking signal to determine whether the braking operation is started or stopped. The travel motor 3 provides reverse torque during braking, slowing the wheels to a stop. During braking, the travel motor 3 acts as a generator, converting kinetic energy into electrical energy. The travel motor controller 4 converts the AC power output of the travel motor 3 into DC power and feeds it back to the power battery 5, thereby recycling braking energy. After collecting the braking signal from the brake pedal 1, the vehicle controller 2 also obtains the power information of the power battery 5. When the power of the power battery 5 reaches a preset power threshold, such as 95% or 100%, the vehicle controller 2 controls the travel motor controller 4 to charge the power battery 5. At the same time, the vehicle controller 2 controls the power battery 5 to output electrical energy to the oil pump motor controller 7, so that the oil pump motor 8 drives the oil pump 9 to operate. The hydraulic oil extracted from the hydraulic oil tank 13 by the oil pump 9 overflows back into the hydraulic oil tank 13 through the hydraulic valve 11 to convert the motor braking energy into hydraulic oil heat. When the hydraulic oil in the hydraulic oil tank 13 gradually rises in temperature due to the heat, the hydraulic oil cooling device 12 can be controlled to start working to dissipate the heat of the hydraulic oil. The preset power threshold can be set according to different equipment and different working conditions, and the power battery 5 is considered to be in a fully charged state. In addition, when the power level of the power battery 5 does not reach the preset power threshold, that is, the power battery 5 is not fully charged, the vehicle controller 2 only controls the driving motor controller 4 to charge the power battery 5 to achieve braking energy recovery and storage.

[0039] It can be understood that the motor braking energy consumption device of this embodiment, when the power battery 5 is fully charged, controls the power battery 5 to output electrical energy to the oil pump motor controller 7, causing the oil pump motor 8 to drive the oil pump 9 to operate. Since the working device 10 is in a locked state at this time, the hydraulic oil drawn from the hydraulic oil tank 13 by the oil pump 9 can only overflow back into the hydraulic oil tank 13 through the hydraulic valve 11, thereby converting the motor braking energy into hydraulic oil heat, which is then dissipated by the hydraulic oil cooling device 12 of the independent hydraulic system. This device can quickly consume the motor braking feedback electrical energy, effectively preventing battery overcharge damage. Moreover, the hydraulic oil tank 13 of the electric engineering machinery is large in volume and has a large heat capacity of hydraulic oil, which can fully consume the motor braking energy, thereby meeting the braking energy consumption requirements of long-term continuous braking conditions, and has higher safety and reliability. It fully utilizes the hydraulic oil tank and hydraulic oil cooling device of the electric engineering machinery, eliminating the need for the design of a special cooling device.

[0040] Optionally, the motor braking energy consumption device also includes a brake resistor 6 arranged in the hydraulic oil tank 13, and the brake resistor 6 is electrically connected to the power battery 5. The vehicle controller 2 obtains the power information of the power battery 5 and the motor braking feedback power information of the driving motor controller 4 at the same time. When the motor braking feedback power is not greater than the rated operating power of the oil pump motor 8, the vehicle controller 2 controls the power battery 5 to only output electrical energy to the oil pump motor controller 7, and when the motor braking feedback power is greater than the rated operating power of the oil pump motor 8, the vehicle controller 2 controls the power battery 5 to output electrical energy to the oil pump motor controller 7 and the brake resistor 6 at the same time. The vehicle controller 2 controls the oil pump motor 8 to operate at the rated operating power through the oil pump motor controller 7, and the brake resistor 6 converts the remaining motor braking energy into hydraulic oil heat. The calculation formula of the motor braking feedback power is: P + represents the motor braking feedback power, N represents the motor speed, T represents the motor braking torque, and η represents the energy recovery efficiency. When the vehicle brakes at different slopes and speeds, the required motor braking will be different, resulting in changes in the motor braking feedback power. The driving motor controller 4 will feed back the motor braking feedback power to the vehicle controller 2 in real time.

[0041] In addition, when the motor braking feedback power P + When the power consumption of the oil pump motor 8 is not greater than the rated operating power P0, the power consumption of the oil pump motor 8 can be adjusted by controlling the speed of the oil pump motor 8 or the overflow pressure of the hydraulic valve 11. The power consumption of the oil pump motor 8 is calculated as follows:

[0042]

[0043] Among them, P - represents the power consumption of the oil pump motor 8, p represents the overflow pressure of the hydraulic valve 11, Q represents the output flow of the oil pump 9, Q=q×n, q represents the displacement of the oil pump 9, n represents the speed of the oil pump 9, that is, the speed of the oil pump motor 8, and η1 represents the oil pump efficiency. In order to avoid excessive consumption of the power energy of the power battery 5 and keep the power battery 5 in a fully charged state as much as possible, it is necessary to control the power consumption P of the oil pump motor 8. - and motor braking feedback power P + Therefore, the power consumption of the oil pump motor 8 can be adjusted by controlling the speed of the oil pump motor 8 or the overflow pressure of the hydraulic valve 11 to make it equal to the motor brake feedback power, thereby consuming the braking energy in a timely manner and avoiding excessive consumption. Of course, in other embodiments of the present invention, the power consumption of the oil pump motor 8 can also be adjusted to be slightly greater than the motor brake feedback power.

[0044] When the motor braking feedback power is greater than the rated operating power of the oil pump motor 8, the motor braking energy cannot be consumed by the oil pump motor 8 alone. The power battery 5 is controlled to output electrical energy to the oil pump motor controller 7 and the brake resistor 6 at the same time. The oil pump motor 8 works at the rated operating power, and the remaining motor braking feedback power is consumed by the brake resistor 6. The brake resistor 6 converts the motor braking energy into hydraulic oil heat. The power consumption calculation formula of the brake resistor 6 is: P1=P + -P0, P1 represent the power consumption of the braking resistor 6.

[0045] It can be understood that by building the brake resistor 6 into the hydraulic oil tank 13, when the motor braking energy exceeds the consumption capacity of the oil pump motor 8, the excess motor braking energy can be converted into heat of the hydraulic oil through the brake resistor 6, and then the hydraulic oil is cooled by the hydraulic oil cooling device 12, thereby further improving the motor braking energy consumption capacity and consumption speed.

[0046] Optionally, a temperature sensor is provided in the hydraulic oil tank 13 and is electrically connected to the vehicle controller 2. The vehicle controller 2 is configured to control the hydraulic oil cooling device 12 to start operating when the temperature sensor detects that the temperature of the hydraulic oil in the hydraulic oil tank 13 reaches a preset temperature threshold, thereby realizing intelligent start and stop of the hydraulic oil cooling device 12. Of course, in other embodiments of the present invention, the hydraulic oil cooling device 12 may also be controlled to start operating after a brake signal is collected, that is, the hydraulic oil is cooled while consuming braking energy.

[0047] In addition, in foreseeable application scenarios, it is also possible to choose to actively start the entire system to reduce the power of the power battery 5.

[0048] It can be understood that the motor braking energy of this embodiment has three transmission routes:

[0049] The first one, such as Figure 2 As shown, when the power level of the power battery 5 is less than the preset power threshold, the braking energy of the driving motor 3 can be recharged back to the power battery 5, and the vehicle controller 2 sends an instruction to the driving motor controller 4 to convert the AC power output by the driving motor 3 during braking into DC power, and recharge it back to the power battery 5, thereby realizing energy recovery and storage.

[0050] The second type, such as Figure 3 As shown, when the power level of the power battery 5 reaches the preset power threshold and the motor braking feedback power is not greater than the rated operating power of the oil pump motor 8, the braking energy of the driving motor 3 can no longer be recharged to the power battery 5. The vehicle controller 2 sends an instruction to the power battery 5 to output electrical energy to the oil pump motor controller 7. The power battery 5 is in a state of charging and discharging at the same time, and the oil pump motor 8 drives the oil pump 9 to operate, converting the motor braking energy into hydraulic oil heat, and dissipating the heat with the help of the existing hydraulic oil cooling device 12 to take away the heat of the hydraulic oil.

[0051] The third type, such as Figure 4 As shown, when the power level of the power battery 5 reaches the preset power threshold and the motor braking feedback power is greater than the rated operating power of the oil pump motor 8, the braking energy of the driving motor 3 can no longer be recharged to the power battery 5, and the oil pump motor 8 cannot consume all the motor braking energy. At this time, the vehicle controller 2 outputs an instruction to the power battery 5, so that it simultaneously outputs electrical energy to the oil pump motor controller 7 and the brake resistor 6. The oil pump motor 8 operates at the rated operating power, and the remaining motor braking energy is converted into hydraulic oil heat through the brake resistor 6, and is dissipated with the help of the existing hydraulic oil cooling device 12 to take away the hydraulic oil heat.

[0052] In addition, if Figure 5 As shown, another embodiment of the present invention further provides a motor braking energy consumption method, preferably using the motor braking energy consumption device as described above, including the following contents:

[0053] Step S1: acquiring power information of the power battery after collecting the braking signal;

[0054] Step S2: Compare the current power level of the power battery with the preset power threshold. If the current power level of the power battery reaches the preset power threshold, control the driving motor controller to charge the power battery and control the power battery to output power to the oil pump motor controller.

[0055] It can be understood that the motor braking energy consumption method of this embodiment, after the power battery is fully charged, controls the power battery to output electrical energy to the oil pump motor controller, so that the oil pump motor drives the oil pump to operate. Since the working device is in a locked state at this time, the hydraulic oil extracted by the oil pump from the hydraulic oil tank can only overflow back into the hydraulic oil tank through the hydraulic valve, thereby converting the motor braking energy into hydraulic oil heat, so that the hydraulic oil can be dissipated through the hydraulic oil cooling device of the independent hydraulic system. This method can quickly consume the motor braking feedback electrical energy, effectively preventing battery overcharge damage. In addition, the hydraulic oil tank of the electric engineering machinery is large in volume and the heat capacity of the hydraulic oil is also large, which can fully consume the motor braking energy, thereby meeting the braking energy consumption requirements of long-term continuous braking conditions, and has higher safety and reliability. It fully utilizes the hydraulic oil tank and hydraulic oil cooling device of the electric engineering machinery, without the need for additional design of a special cooling device.

[0056] In addition, in step S1, after collecting the designated signal, the motor braking feedback power information of the driving motor controller is also obtained. In step S2, when the motor braking feedback power is not greater than the rated operating power of the oil pump motor, the power battery is controlled to output electric energy only to the oil pump motor controller, and when the motor braking feedback power is greater than the rated operating power of the oil pump motor, the power battery is controlled to output electric energy to the oil pump motor controller and the brake resistor at the same time.

[0057] In addition, when the motor brake feedback power is not greater than the rated operating power of the oil pump motor, its power consumption is adjusted by controlling the speed of the oil pump motor or the overflow pressure of the hydraulic valve. The power consumption calculation formula of the oil pump motor is:

[0058]

[0059] Among them, P - represents the power consumption of the oil pump motor, p represents the overflow pressure of the hydraulic valve, Q represents the output flow of the oil pump, Q=q×n, q represents the displacement of the oil pump, n represents the speed of the oil pump, and η1 represents the efficiency of the oil pump.

[0060] In addition, if Figure 6 As shown, the motor braking energy consumption method also includes the following contents:

[0061] Step S3: monitoring the temperature of the hydraulic oil in the hydraulic oil tank, and when it is detected that the temperature of the hydraulic oil in the hydraulic oil tank reaches a preset temperature threshold, controlling the hydraulic oil cooling device to start working.

[0062] In addition, in foreseeable application scenarios, you can also choose to actively turn on the entire system to reduce the power of the power battery.

[0063] In addition, another embodiment of the present invention provides an electric engineering machine, preferably using the above-mentioned motor braking energy consumption device. The electric engineering machine can be an electric wet sprayer, an electric rock drilling rig, or other engineering machine with an independent hydraulic system.

[0064] Although the preferred embodiment of the present application has been described, those skilled in the art may make other changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiment and all changes and modifications that fall within the scope of the present application.

[0065] Obviously, those skilled in the art may make various changes and modifications to this application without departing from the spirit and scope of this application. Thus, if these modifications and variations of this application fall within the scope of the claims of this application and their equivalents, this application is intended to include these modifications and variations.

[0066] The foregoing description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention are intended to be within the scope of protection of the present invention.

Claims

1. A motor braking energy consumption device, suitable for electric engineering machinery with an independent hydraulic system, characterized in that: The invention comprises a brake pedal (1), a vehicle controller (2), a travel motor (3), a travel motor controller (4), a power battery (5), an oil pump motor controller (7), an oil pump motor (8), an oil pump (9), a hydraulic valve (11), a hydraulic oil cooling device (12) and a hydraulic oil tank (13), wherein the vehicle controller (2) is electrically connected to the brake pedal (1), the travel motor controller (4), the power battery (5) and the hydraulic oil cooling device (12), the travel motor controller (4) is electrically connected to the travel motor (3) and the power battery (5), and the power battery (5) is electrically connected to the hydraulic oil cooling device (12). The tank (5) is electrically connected to the oil pump motor controller (7), the oil pump motor controller (7) is electrically connected to the oil pump motor (8), the oil pump motor (8) is drivingly connected to the oil pump (9), the oil pump (9) is connected to the hydraulic oil tank (13) and the working device (10) respectively, when the motor braking energy is consumed, the working device (10) is in a locked state, the hydraulic valve (11) and the hydraulic oil cooling device (12) are arranged on the oil return line connecting the oil pump (9) and the hydraulic oil tank (13), and the hydraulic valve (11) has a pressure relief overflow function; After collecting the braking signal of the brake pedal (1), the vehicle controller (2) also obtains the power information of the power battery (5). When the power of the power battery (5) reaches a preset power threshold, the vehicle controller (2) controls the driving motor controller (4) to charge the power battery (5), and at the same time controls the power battery (5) to output electric energy to the oil pump motor controller (7), so that the oil pump motor (8) drives the oil pump (9) to operate, and the hydraulic oil extracted from the hydraulic oil tank (13) by the oil pump (9) overflows back into the hydraulic oil tank (13) through the hydraulic valve (11), so as to convert the motor braking energy into hydraulic oil heat, and the hydraulic oil cooling device (12) is controlled to start working to dissipate heat from the hydraulic oil; The invention also includes a brake resistor (6) arranged in the hydraulic oil tank (13), the brake resistor (6) being electrically connected to the power battery (5), the vehicle controller (2) obtaining the power information of the power battery (5) and the motor braking feedback power information of the driving motor controller (4), when the motor braking feedback power is not greater than the rated operating power of the oil pump motor (8), the power battery (5) is controlled to output only electric energy to the oil pump motor controller (7), and when the motor braking feedback power is greater than the rated operating power of the oil pump motor (8), the power battery (5) is controlled to output electric energy to the oil pump motor controller (7) and the brake resistor (6) at the same time, the oil pump motor (8) operates at the rated operating power, and the brake resistor (6) converts the remaining motor braking energy into hydraulic oil heat.

2. The motor braking energy consumption device according to claim 1, characterized in that: When the motor brake feedback power is not greater than the rated operating power of the oil pump motor (8), the power consumption thereof is adjusted by controlling the rotation speed of the oil pump motor (8) or the overflow pressure of the hydraulic valve (11), wherein the power consumption of the oil pump motor (8) is calculated as follows: Among them, P - represents the power consumption of the oil pump motor (8), p represents the overflow pressure of the hydraulic valve (11), Q represents the output flow of the oil pump (9), Q=q×n, q represents the displacement of the oil pump (9), n represents the rotation speed of the oil pump (9), and η1 represents the efficiency of the oil pump.

3. The motor braking energy consumption device according to claim 1, characterized in that: A temperature sensor is provided in the hydraulic oil tank (13), and the temperature sensor is electrically connected to the vehicle controller (2). The vehicle controller (2) is used to control the hydraulic oil cooling device (12) to start working when the temperature sensor detects that the temperature of the hydraulic oil in the hydraulic oil tank (13) reaches a preset temperature threshold.

4. The motor braking energy consumption device according to claim 1, characterized in that: When the power level of the power battery (5) does not reach a preset power threshold, the vehicle controller (2) only controls the travel motor controller (4) to charge the power battery (5).

5. A method for consuming motor braking energy, using the motor braking energy consumption device according to any one of claims 1 to 4, characterized in that: Includes the following: After collecting the braking signal, the power battery information is obtained; The current power level of the power battery is compared with the preset power threshold. If the current power level of the power battery reaches the preset power threshold, the driving motor controller is controlled to charge the power battery, and the power battery is controlled to output power to the oil pump motor controller.

6. The motor braking energy consumption method according to claim 5, characterized in that: After collecting the designated signal, the motor braking feedback power information of the driving motor controller is also obtained. When the motor braking feedback power is not greater than the rated operating power of the oil pump motor, the power battery is controlled to output electric energy only to the oil pump motor controller. When the motor braking feedback power is greater than the rated operating power of the oil pump motor, the power battery is controlled to output electric energy to the oil pump motor controller and the brake resistor at the same time.

7. The motor braking energy consumption method according to claim 6, characterized in that: When the motor brake feedback power is not greater than the rated operating power of the oil pump motor, its power consumption is adjusted by controlling the speed of the oil pump motor or the overflow pressure of the hydraulic valve. The power consumption calculation formula of the oil pump motor is: Among them, P - represents the power consumption of the oil pump motor, p represents the overflow pressure of the hydraulic valve, Q represents the output flow of the oil pump, Q=q×n, q represents the displacement of the oil pump, n represents the speed of the oil pump, and η1 represents the efficiency of the oil pump.

8. The motor braking energy consumption method according to claim 5, characterized in that: Also included: The hydraulic oil temperature in the hydraulic oil tank is monitored, and when it is detected that the hydraulic oil temperature in the hydraulic oil tank reaches a preset temperature threshold, the hydraulic oil cooling device is controlled to start working.

9. An electric engineering machine, characterized in that: The motor braking energy consumption device according to any one of claims 1 to 4 is used.

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