阅读说明：本技术 一种电传动控制系统及装载机 (Electric transmission control system and loader ) 是由 魏加洁 韩嫔 王小虎 郁干 范小童 李夏宇 于 2021-06-23 设计创作，主要内容包括：本发明公开了一种电传动控制系统及装载机,包括ISG电机、发动机、发电机、蓄电池、第一控制器、第二控制器、CAN总线、四轮独立驱动系统、工作系统和转向系统,所述控制器判断发动机的输出功率是否在目标区间内,并根据判断结果协调四轮独立驱动系统、工作系统和转向系统工作,当发动机的输出功率不在目标区间时,第一控制器控制发电机向蓄电池充电,同时向四轮独立驱动系统输送电能；当发动机的输出功率在目标区间时,第一控制器控制蓄电池和ISG电机向负载输出额外的功率增量。本发明能够使ISG电机根据发动机的输出功率协调整机的运行状态,以提高能源利用率,达到节能降耗的目的。(The invention discloses an electric drive control system and a loader, which comprises an ISG motor, an engine, a generator, a storage battery, a first controller, a second controller, a CAN bus, a four-wheel independent drive system, a working system and a steering system, wherein the controller judges whether the output power of the engine is in a target interval or not, coordinates the four-wheel independent drive system, the working system and the steering system to work according to a judgment result, and controls the generator to charge the storage battery when the output power of the engine is not in the target interval, and simultaneously transmits electric energy to the four-wheel independent drive system; when the output power of the engine is in the target interval, the first controller controls the storage battery and the ISG motor to output an additional power increment to the load. The invention can lead the ISG motor to coordinate the running state of the whole machine according to the output power of the engine, thereby improving the energy utilization rate and achieving the purposes of energy conservation and consumption reduction.)

1. An electric transmission control system is characterized by comprising an ISG motor, an engine, a generator, a storage battery, a controller, a four-wheel independent driving system, a working system and a steering system;

the controller judges whether the output power of the engine is in a target interval or not, and coordinates the four-wheel independent driving system, the working system and the steering system to work according to the judgment result;

when the output power of the engine is not in the target interval, the controller controls the ISG motor to charge the storage battery; when the output power of the engine is in the target interval, the controller controls the storage battery and the ISG motor to output additional power increment to the driving system, the working system and the steering system.

2. The electrical transmission control system of claim 1, wherein the controller includes a first controller, a second controller, and a CAN bus, the first controller capable of reading the output signal of the second controller via the CAN bus.

3. The electric drive control system of claim 2, wherein the working system comprises a working pump, a multi-way valve, a lifting cylinder and a first handle, the working pump supplies oil to the lifting cylinder through the multi-way valve, and the second controller can control the lifting cylinder to ascend and descend according to an output signal of the first handle.

4. The electric drive control system of claim 3, wherein the steering system includes a steering pump, a priority valve, a steering cylinder, and a second handle, the steering pump supplying oil to the steering cylinder through the priority valve and the steering valve, the second controller being capable of controlling the steering cylinder to steer in accordance with an output signal of the second handle.

5. The electric drive control system of claim 2, wherein the four-wheel independent drive system comprises four independent drive assemblies including a traction motor, a speed reducer connected to the traction motor, and a sensor for outputting a signal to the first controller.

6. The electric drive control system of claim 4, further comprising a transfer case coupled to the generator, the work pump, and the steering pump, respectively.

7. The electric drive control system of claim 2, further comprising an accelerator pedal, wherein the first controller is configured to control the generator to deliver electric power to the four-wheel independent drive system based on an output signal from the accelerator pedal.

8. The electric drive control system of claim 1, wherein the generator comprises an asynchronous generator, a synchronous generator.

9. The electric drive control system of claim 1, wherein the target interval is 0.98-1 times the maximum power output by the engine.

10. A loader comprising an electric drive control system according to any one of claims 1 to 9.

Technical Field

The invention relates to an electric transmission control system and a loader, and belongs to the technical field of engineering machinery.

Background

The traditional loader transmission system adopts an engine, a torque converter, a gearbox and a drive axle to transmit driving force so as to meet the requirement of the whole loader to run, and a power take-off port is arranged on the gearbox to output the driving force to a working pump so as to meet the requirement of hydraulic power.

Because the high-efficiency interval of the torque converter is narrow, the working efficiency of the loader is mostly lower than 70%, in addition, more than 30% of energy is wasted in a heating mode, the energy utilization efficiency of the loader is not high, meanwhile, in order to meet the power requirement of composite actions (walking, driving and steering), the power selection of the engine is generally larger, so that flameout caused by insufficient power is prevented, but the high-power engine causes higher comprehensive cost of an after-treatment device, a radiator, a vibration reduction accessory, oil consumption and the like matched with the engine, and the noise is larger.

In order to solve the problems, the invention provides an electric transmission control system and a loader.

Disclosure of Invention

The invention aims to overcome the defects in the prior art and provide an electric transmission control system and a loader, which can enable an ISG motor to coordinate the running states of a four-wheel independent driving system, a working system and a steering system according to the output power of an engine, improve the energy utilization rate and achieve the purposes of saving energy and reducing consumption.

In order to solve the technical problems, the invention is realized by adopting the following technical scheme:

in one aspect, the invention provides an electric transmission control system, which comprises an ISG motor, an engine, a generator, a storage battery, a controller, a four-wheel independent driving system, a working system and a steering system;

the controller judges whether the output power of the engine is in a target interval or not, and coordinates the four-wheel independent driving system, the working system and the steering system to work according to the judgment result;

when the output power of the engine is not in the target interval, the controller controls the ISG motor to charge the storage battery; when the output power of the engine is in the target interval, the controller controls the storage battery and the ISG motor to output additional power increment to the driving system, the working system and the steering system.

Preferably, the controller includes a first controller, a second controller and a CAN bus, and the first controller CAN read an output signal of the second controller through the CAN bus.

Preferably, the working system comprises a working pump, a multi-way valve, a lifting cylinder and a first handle, the working pump supplies oil to the lifting cylinder through the multi-way valve, and the second controller can control the lifting cylinder to lift according to an output signal of the first handle.

Preferably, the steering system comprises a steering pump, a priority valve, a steering cylinder and a second handle, the steering pump supplies oil to the steering cylinder through the priority valve and the steering valve, and the second controller can control the steering cylinder to steer according to an output signal of the second handle.

Preferably, the four-wheel independent drive system comprises four independent drive assemblies, and the four independent drive assemblies comprise a traction motor, a speed reducer connected with the traction motor and a sensor for outputting signals to the first controller.

Preferably, the transfer case is further included and is respectively connected with the generator, the working pump and the steering pump.

Preferably, the four-wheel independent drive system further comprises an accelerator pedal, and the first controller can control the generator to supply electric energy to the four-wheel independent drive system according to an output signal of the accelerator pedal.

Preferably, the generator comprises an asynchronous generator, a synchronous generator.

Preferably, the target interval is 0.98-1 times of the maximum power output by the engine.

In another aspect, the present disclosure provides a loader comprising the electric drive control system.

Compared with the prior art, the invention has the following beneficial effects:

1. the invention provides an electric transmission control system, which comprises an ISG motor, an engine, a generator, a storage battery, a first controller, a second controller, a CAN bus, a four-wheel independent driving system, a working system and a steering system, wherein the controller judges whether the output power of the engine is in a target interval, coordinates the four-wheel independent driving system, the working system and the steering system to work according to the judgment result, and controls the generator to charge the storage battery when the output power of the engine is not in the target interval and simultaneously transmits electric energy to the four-wheel independent driving system; when the output power of the engine is in a target interval, the second controller outputs signals to the first controller through the CAN bus, so that the first controller controls the storage battery and the ISG motor to output extra power increment to the working system and the steering system. The invention can lead the ISG motor to coordinate the running states of the three systems according to the output power of the engine, thereby improving the energy utilization rate and achieving the purposes of saving energy, reducing consumption and saving cost.

2. The invention provides an electric transmission control system which has the characteristics of higher energy efficiency, remarkable energy saving and the like. Because the transmission parts such as a torque converter, a gearbox and a drive axle are reduced, the heating energy consumption of the whole electric transmission control system is reduced, the overall heating of the system can be reduced, and the energy utilization rate can be improved by 15-25%.

3. The invention provides a loader which comprises an electric transmission control system, wherein the electric transmission control system can reduce the power and torque requirements of an engine, and compared with the existing high-power, large-size and large-displacement engine, the loader disclosed by the invention has the advantages that the ISG motor is adopted to compensate the power of the system, the power of the existing engine can be reduced, the cost can be saved, and the working efficiency can be improved. Meanwhile, the loader has better flexibility and wider adaptability. The ISG motor can output power to a load, can charge a storage battery, can perform efficient cooperation operation when needed, and can also perform charging energy conservation when not needed, so that the ISG motor has better adaptability and flexibility.

Drawings

Fig. 1 is a schematic structural diagram of an electric drive control system according to an embodiment of the present invention;

in the figure: 1. an accelerator pedal; 2. a storage battery; 3. an engine; 4. a first controller; 5. an ISG motor; 6. a generator; 7. a CAN bus; 8. a transfer case; 9. a second controller; 10. a working pump; 11. a first handle; 12. a multi-way valve; 13. a lifting cylinder; 14. a sensor; 15. an independent drive assembly; 16. a steering pump; 17. a priority valve; 18. a second handle; 19. a steering valve; 20. and a steering cylinder.

Detailed Description

The invention is further described below with reference to the accompanying drawings. The following examples are only for illustrating the technical solutions of the present invention more clearly, and the protection scope of the present invention is not limited thereby.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on those shown in the drawings, and are used only for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention. Furthermore, the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first," "second," etc. may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art through specific situations.

The first embodiment is as follows:

the invention provides an electric transmission control system, which has a structural schematic diagram shown in figure 1 and specifically comprises an ISG motor 5, an engine 3, a generator 6, a storage battery 2, a first controller 4, a second controller 9, a CAN bus 7, a four-wheel independent driving system, a working system and a steering system.

In this embodiment, the input port of the first controller 4 is connected to the engine 3, the battery 2, the ISG motor 5, the generator 6, the CAN bus 7, and the four-wheel independent drive system, the output port of the first controller 4 is connected to the engine 3, the battery 2, the ISG motor 5, the generator 6, the four-wheel independent drive system, and the CAN bus 7, the output port of the second controller 9 is connected to the CAN bus 7, the operating system, and the steering system, the second controller 9 is connected to the first controller 4 through the CAN bus 7, and the first controller 4 and the second controller 9 CAN coordinate the four-wheel independent drive system, the operating system, and the steering system to operate according to the output power of the engine 3.

Specifically, the four-wheel independent drive system comprises four independent drive assemblies 15, the four independent drive assemblies 15 comprise traction motors, speed reducers and sensors 14, the speed reducers are electrically connected with the traction motors, the sensors 14 can be used for outputting signals to the first controller 4, and it is understood that the output signals of the sensors 14 comprise the rotating speed, the torque, the power, the current, the voltage and the like of the independent drive assemblies 15. The electric transmission control system further comprises an accelerator pedal 1, the first controller 4 can control the generator 6 to transmit electric energy to the four-wheel independent driving system according to an output signal of the accelerator pedal 1, and the generator 6 can simultaneously transmit electric energy to the four independent driving systems. The generator 6 is an alternating current generator 6, the alternating current generator 6 comprises an alternating current asynchronous generator 6, a permanent magnet synchronous generator 6 and the like, after the generator 6 generates electricity, the electricity is transmitted to a traction motor of the independent driving assembly 15 after being rectified, voltage regulated and inverted by the first controller 4, and under the condition, the traction motor can drive a speed reducer to travel.

In this embodiment, the working system includes a working pump 10, a multi-way valve 12, a lifting cylinder 13 and a first handle 11, the first handle 11 is connected to an input port of the second controller 9, the working pump 10, the multi-way valve 12 and the lifting cylinder 13 are connected by an oil circuit, an oil source flows to the multi-way valve 12 through the working pump 10 and then flows into the lifting cylinder 13 to supply oil to the lifting cylinder 13, the lifting cylinder 13 is used for connecting a lifting boom, the working pump 10 is a variable electric control hydraulic pump, and the displacement of the pump can be adjusted according to an input electric signal. The multi-way valve 12 is an electrically controlled multi-way valve 12, and the valve core opening can be adjusted according to an input electric signal. As will be understood by those skilled in the art, the lifting cylinder 13 comprises a large chamber and a small chamber, two lifting cylinders 13 are provided, the multi-way valve 12 is respectively connected with the large chamber and the small chamber of the two lifting cylinders 13, oil flows into the large chamber of the lifting cylinder 13 after flowing out from the multi-way valve 12, and the oil is returned to the oil tank through the multi-way valve 12 after the small chamber is pressurized. The second controller 9 can control the lifting and lowering of the lifting cylinder 13 according to the output signal of the first handle 11, that is, the lifting and lowering of the lifting boom is controlled by controlling the lifting cylinder 13.

When the lifting boom needs to be lifted, a driver needs to adjust the rotation angle of the first handle 11, and the second controller 9 outputs a proportional signal to the working pump 10 and the multi-way valve 12 after detecting a lifting signal of the lifting cylinder 13, so that the lifting boom is lifted. It should be noted that the displacement output of the working pump 10, the valve core opening of the multi-way valve 12 and the rotation angle of the first handle 11 are positively correlated, and when the rotation angle of the first handle 11 is larger, the displacement output of the working pump 10 is more, and the valve core opening of the multi-way valve 12 is correspondingly larger, so that the speed of the lifting cylinder 13 driving the boom to lift is faster. In this embodiment, when the first handle 11 rotates to the right, the lifting cylinder 13 lifts, and when the first handle 11 rotates to the left, the lifting cylinder 13 descends, and those skilled in the art can set the rotation of the first handle 11 to the right to lower the lifting cylinder 13, and lift the lifting cylinder 13 when rotating to the left, which is not limited herein.

The steering system comprises a steering pump 16, a priority valve 17, a steering valve 19, a steering cylinder 20 and a second handle 18, wherein the second handle 18 is connected with an input port of a second controller 9, the steering pump 16, the priority valve 17, the steering valve 19 and the steering cylinder 20 are also connected in an oil way connection mode, specifically, the steering pump 16 supplies oil to the steering cylinder 20 through the priority valve 17 and the steering valve 19, specifically, the steering pump 16 is connected with a working oil port Q of the steering valve 19 through a working oil port L of the priority valve 17, the working oil port R and the working oil port S of the steering valve 19 are respectively connected with the two steering cylinders 20, return oil of the steering cylinder 20 returns to an oil tank after passing through the working oil port N of the steering valve 19, wherein the working oil port R of the steering valve 19 is used for oil feeding and is used for a right steering loop, and the working oil port S of the steering valve 19 is used for oil feeding, is a left steering loop. The second controller 9 is capable of controlling the steering cylinder 20 to steer according to the output signal of the second handle 18. It should be noted that the steering pump 16 is a variable electrically controlled hydraulic pump, and the displacement of the pump can be adjusted according to the input electric signal. The priority valve 17 and the steering valve 19 are both electrically controlled proportional valves, and the opening degree of the valve core can be adjusted according to the input electric signals.

When a steering operation is required, the driver adjusts the rotation angle of the second handle 18, and the second controller 9 detects a steering signal and outputs signals to the steering pump 16, the priority valve 17, and the steering valve 19 to perform the steering operation. The displacement output of the steering pump 16, the valve opening degree of the priority valve 17, and the valve opening degree of the steering valve 19 are positively correlated with the pivot angle of the second handle 18. When the rotation angle of the second handle 18 is larger, the displacement output of the steering pump 16 is larger, the valve core opening degree of the priority valve 17 and the steering valve 19 is larger, and the steering angle of the whole machine is larger. In this embodiment, when the first handle 11 is turned to the right, the steering cylinder 20 performs a right turning motion, and when the first handle is turned to the left, the steering cylinder 20 performs a left turning motion, and those skilled in the art can set that the second handle 18 is turned to the right so that the steering cylinder 20 performs a left turning motion, and when the second handle is turned to the left, the steering cylinder 20 performs a right turning motion.

As a preferred embodiment, the priority valve 17 is connected to the multi-way valve 12, that is, an oil source can supply oil to the working system and the steering system at the same time, and specifically, the working oil port M of the priority valve 17 is connected to the oil inlet of the multi-way valve 12. After understanding the essence of the present invention, it will be understood by those skilled in the art that the first controller 4 and the second controller 9 can be adjusted according to the working state of the working system and the steering system. When the electric drive control system needs to perform a steering operation, the priority valve 17 preferentially ensures the steering operation of the steering cylinder 20, and when the steering operation is not needed, the oil in the priority valve 17 merges with the multi-way valve 12.

When the driver stops steering, the second handle 18 is reset, and the front frame and the rear frame of the whole machine still have certain angular displacement, namely the whole machine is not in a centering/aligning state. At this time, if the first handle 11 is still at the lifting position, the second controller 9 cuts off the signals of the priority valve 17 and the steering valve 19, but still has a signal to the steering pump 16, i.e. the steering cylinder 20 stops the steering action, the priority valve 17 resets, the steering pump 16 supplies oil to the oil inlet of the multi-way valve 12 through the priority valve 17, i.e. the working pump 10 and the steering pump 16 simultaneously supply oil to the multi-way valve 12 (double-pump confluence), the lifting speed of the lifting cylinder 13 is increased, and the working efficiency can be obviously improved.

The electric transmission control system further comprises a transfer case 8, and the transfer case 8 is respectively connected with the generator 6 and the working pump 10. In this embodiment, the engine 3 is sequentially connected with the ISG motor 5, the generator 6, the transfer case 8, the working pump 10 and the steering pump 16 in series. Specifically, the transfer case 8 is mechanically connected with the generator 6, the ISG motor 5 and the engine 3 through couplings, the transfer case 8 is mechanically connected with the working pump 10 and the steering pump 16 through splines, and preferably, the axes of the flywheel of the engine 3, the ISG motor 5, the generator 6 and the input shaft of the transfer case 8 are coincident.

When the driver steps on the accelerator pedal 1, the first controller 4 outputs a signal to the generator 6 according to the rotation angle of the accelerator pedal 1, and outputs electric energy to the traction motor in the four-wheel independent drive system. At the moment, the whole machine normally runs, the engine 3 drives the ISG motor 5, the generator 6, the transfer case 8, the working pump 10 and the steering pump 16 to run, the ISG motor 5 charges the storage battery 2 through the first controller 4, and meanwhile, the generator 6 transmits electric energy to the four-wheel independent driving system through the first controller 4 so as to drive the whole machine to run.

The stepping angle of the accelerator pedal 1, the strength of the signal output to the engine 3 by the first controller 4, and the rotation speed of the engine 3 are positively correlated, and the larger the stepping angle of the accelerator pedal 1 is, the larger the rotation speed of the engine 3 and the power generation amount of the generator 6 are, and accordingly, the larger the power of the traction motor is, and in this case, the faster or stronger the overall traveling speed is.

When the driver does not need to perform the walking action but performs the lifting action, the driver does not step on the accelerator pedal 1, and controls the lifting cylinder 13 to lift by rotating the first handle 11 to the right, at this time, the electric drive control system only consumes power by the working pump 10 and the steering pump 16 (double pump confluence), and the output power of the engine 3 is sufficient, therefore, the first controller 4 sends a signal for stopping power generation to the generator 6, accordingly, the generator 6 is in an idle state, and the generator 6 does not transmit electric energy to the first controller 4. When the lifting movable arm is lifted to the top, a driver loosens the first handle 11, the first handle 11 is reset, and the lifting action of the lifting cylinder 13 is stopped; when the whole machine is driven to run only, the output power of the engine 3 is sufficient, the first controller 4 sends a power generation signal to the storage battery 2 and the ISG motor 5, and the ISG motor 5 charges the storage battery 2.

When the boom is not lifted but the full load transportation is performed, the second controller 9 does not output a signal to the CAN bus 7 and accordingly the first controller 4 does not detect that the CAN detects the output signal of the second controller 9, and in this case, the first controller 4 detects that the output power of the engine 3 is not in the target section, and thus outputs a power generation signal to the battery 2 and the ISG motor 5, and the ISG motor 5 charges the battery 2.

After the first controller 4 detects the steering signal of the second controller 9 through the CAN (taking steering to the left as an example), different powers are output to the four independent drive assemblies 15, that is, the power of the two independent drive assemblies 15 on the left inner side is smaller, and the power of the two independent drive assemblies 15 on the right outer side is larger, so as to ensure that the dynamic differential steering of the outer independent drive assembly 15 and the inner independent drive assembly 15 is close to a pure rolling state, and reduce the slip power consumption of the four-wheel independent drive system.

In this embodiment, when the electric transmission control system performs lifting action, or drives to walk, or turns, the output power of the engine 3 meets the requirement, the output power is not in the target interval, the electric transmission control system does not stall, and the running efficiency of the whole machine is high. When three actions of driving, steering and lifting are carried out simultaneously, at the moment, the whole machine is fully loaded to carry out composite action operation of lifting a movable arm, driving and walking and steering, the rotating speed of the engine 3 is reduced more to meet the torque and power requirements of a load, therefore, the output power of the engine 3 is close to or reaches the maximum value, at the moment, the power output of the ISG motor 5 needs to be started, and the engine 3 and the ISG motor 5 output power to the load together. When three actions of driving, steering and lifting are carried out simultaneously, the working states of all the systems are as follows:

lifting the whole machine: the first handle 11 is rotated, the second controller 9 receives a rotation angle output signal of the first handle 11, and controls the working pump 10 and the multi-way valve 12 to operate according to the rotation angle output signal of the first handle 11, the working pump 10 and the multi-way valve 12 are simultaneously opened, and oil is supplied to the lifting cylinder 13;

the whole machine walks: the accelerator pedal 1 is stepped on, the first controller 4 receives a rotation angle output signal of the accelerator pedal 1, the generator 6 is controlled to generate power according to the rotation angle output signal of the accelerator pedal 1, different powers are output to the four independent drive assemblies 15 through the first controller 4, and the four-wheel independent drive system is driven to run to achieve the purpose of forward movement or backward movement.

Turning the whole machine: when the second handle 18 is turned, the second controller 9 receives the turning angle output signal of the second handle 18 and controls the steering pump 16, the priority valve 17, and the steering valve 19 to operate according to the turning angle output signal of the second handle 18, and at this time, the steering pump 16, the priority valve 17, and the steering valve 19 are simultaneously opened to supply oil to the steering cylinder 20. Meanwhile, after the first controller 4 detects the corresponding steering signal output by the second controller 9 through the CAN bus 7, different power values are output to the four independent driving assemblies 15, namely the power of the two inner independent driving assemblies 15 is smaller, and the power of the two outer independent driving assemblies 15 is larger, so that the dynamic differential steering of the outer independent driving assemblies 15 and the dynamic differential steering of the inner independent driving assemblies 15 are close to a pure rolling state, the steering angle state of the whole machine is positively correlated with the angle of the second handle 18, and the dynamic steering willingness requirement of a driver is met.

To sum up, when the whole machine works compositely, the first controller 4 automatically detects the output power, the torque and the rotating speed of the engine 3, the whole machine simultaneously performs lifting, walking and steering actions, and when the output power of the engine 3 is in a target interval, the second controller 9 CAN output signals to the first controller 4 through the CAN bus 7, so that the first controller 4 CAN control the storage battery 2 and the ISG motor 5 to output extra power to a working system and a steering system, and ensure that the external output power of the engine 3 is the maximum value, so that the ISG motor 5 provides extra load power when the engine 3 works near a maximum power point, the requirement of high-efficiency operation is met, and the lifting and steering actions are not required to be met by reducing the driving power so as to achieve the coordination work of three systems. Therefore, the invention can coordinate the running states of the three systems according to the output power of the engine 3 to improve the energy utilization rate and achieve the purposes of saving energy, reducing consumption and saving cost.

The target interval of the output power of the engine 3 is an interval close to or reaching the maximum value: a is not less than 98% of the maximum power value and not more than the maximum power value. Namely, the target interval is 0.98-1 times of the maximum power output by the engine. That is, when the power output from the engine reaches 98% of the maximum power, the first controller 4 starts the power output signal of the ISG motor 5.

When the output power of the engine 3 is not in the target interval, the first controller 4 can control the generator 6 to charge the storage battery 2 and can simultaneously supply electric energy to the four-wheel independent drive system; when the output power of the engine 3 is in the target interval, the second controller 9 CAN output a signal to the first controller 4 through the CAN bus 7, so that the first controller 4 CAN control the storage battery 2 and the ISG motor 5 to output extra power increment to the working system and the steering system.

In order to facilitate a driver to know the running state of the whole machine, the engine 3, the generator 6, the ISG motor 5, the traction motor of the drive assembly, the running state parameters of the whole machine and the like send signals to the CAN bus 7 through the first controller 4, the working pump 10, the multi-way valve 12, the first handle 11, the steering pump 16, the priority valve 17, the steering valve 19, the second handle 18 and other state information send signals to the CAN bus 7 through the second controller 9, the output signals of the first controller 4 and the output signals of the second controller 9 received by the CAN bus 7 CAN be displayed on the CAN bus 7, and the driver CAN read related signals through the CAN bus 7 to know the running state of the whole machine.

Example two:

the invention further provides a loader, which comprises the electric transmission control system in the first embodiment, and the electric transmission control system is arranged on the loader.

When a driver carries out heavy-load composite action, namely a working system, a four-wheel independent driving system and a steering system on a loader work simultaneously, a first controller 4 CAN automatically detect the output power, the torque and the rotating speed of an engine 3, a second controller 9 outputs signals to the first controller 4 through a CAN bus 7, the first controller 4 detects the output power of the engine 3 and then compares the output power with a set target interval, when the output power of the engine 3 is in the target interval, the first controller 4 sends power output signals to a storage battery 2 and an ISG motor 5, and outputs extra power increment to the ISG motor 5 through the storage battery 2, namely the ISG motor 5 and the engine 3 jointly output power to the driving system, the working system and the steering system of the loader, so that the power load of the engine 3 is lightened, and the rotating speed of the engine 3 is further improved or maintained, the output of the engine 3 is ensured to be close to or equal to the maximum output power, so that the operation efficiency of the whole loader is improved, and the oil consumption of the whole loader is reduced.

When the output power of the engine 3 is not in the target range, for example, the loader is idling, lightly loaded, or performing non-cooperative work, or the degree of the cooperative work mode is not large, that is, the accelerator is lightly stepped on, or the rotation angle of the first handle 11 for lifting the boom is small, the power of the engine 3 is not maximized, and therefore the ISG motor 5 does not participate in the power output, but charges the battery 2 through the first controller 4 in such a manner that the generator 6 generates power.

When the loader is running in an idle state or in a light load state, the first controller 4 detects that the output power of the engine 3 is not in the target section, and in this case, the first controller 4 transmits a power generation signal to the battery 2 and the ISG motor 5, and the ISG motor 5 charges the battery 2.

The driver can control the loader according to the working condition requirement, such as steering, walking and lifting operation, and the lifting and steering actions are not required to be met by reducing the driving power so as to realize the coordination work of the three systems, so that the electric transmission control system can be used for coordinating the running states of the three systems.

Compared with the existing engine 3 with high power, large size and large displacement, the loader provided by the invention has the advantages that the ISG motor 5 is adopted to compensate the power of the system, the power of the existing engine 3 can be reduced, the cost is saved, and meanwhile, the working efficiency is improved. Meanwhile, the loader provided by the invention has better flexibility and wider adaptability. The ISG motor 5 can output power to a load, can charge the storage battery 2, can perform efficient cooperation operation when needed, and can also perform charging energy conservation when not needed, so that the ISG motor has better adaptability and flexibility.

The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, several modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.