Harvester operation quality adjusting method and system

Abstract

The invention provides a harvester operation quality adjusting method and system. A harvester operation quality adjusting method comprises the steps that the real-time gap bridge pressure, the real-time screen surface pressure, the real-time cleaning loss rate and the harvester operation quality adjusting strategy of a harvester are obtained; according to the real-time gap bridge pressure, the real-time screen surface pressure, the real-time cleaning loss rate and the harvester operation quality adjusting strategy, the screen surface opening degree, the fan rotating speed and the vehicle speed of the harvester are adjusted. And by designing a cleaning self-adaptive adjusting mode based on multi-sensor feedback, the operation quality is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of harvester operation quality, and in particular to a harvester operation quality adjustment method and system. Background Art

[0002] Combine harvesters are core equipment for efficient, integrated grain harvesting, threshing, and cleaning in modern agriculture. Their operational quality directly impacts harvest efficiency and economic returns. The cleaning system (including components such as screens and fans) is crucial for separating grain from impurities. Its performance directly determines the cleaning loss rate (the percentage of unrecovered grain), operational efficiency, and impurity content (the percentage of impurities mixed with grain). However, the operational stability of the cleaning system has long been challenged by crop characteristics (such as moisture and density), field conditions (such as weed content and feed rate fluctuations), and mechanical adjustment accuracy.

[0003] The cleaning system (screen opening, fan speed) of traditional combine harvesters relies primarily on manual adjustment based on experience, and is unable to respond in real time to dynamic changes in field crop conditions (such as moisture, density, and weed content), resulting in excessively high cleaning losses or excessively high grain trash content. Response lag: Manual judgment and adjustment require machine downtime, interrupting the operational process and reducing efficiency (field trials show that each downtime takes an average of 3-5 minutes, resulting in an approximately 8% decrease in operational efficiency). Insufficient precision: The human eye has difficulty quantifying grain thickness on the screen (with errors of up to ±20%), and cannot perceive dynamic changes in cleaning losses in real time. Reliance on experience: Different operators adjust parameters variably, leading to significant fluctuations in operational quality (cleaning losses within the same plot can vary by 5%-10%).

[0004] Traditional cleaning systems rely on manual experience and adjustment, with slow response speed and low accuracy. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide a harvester operation quality adjustment method and system in view of the deficiencies in the prior art.

[0006] The technical solution of the present invention to solve the above-mentioned technical problems is as follows: a method for adjusting the operation quality of a harvester, comprising: obtaining the real-time bridge pressure, real-time screen surface pressure, real-time cleaning loss rate and harvester operation quality adjustment strategy of the harvester; adjusting the screen surface opening, fan speed and vehicle speed of the harvester according to the real-time bridge pressure, the real-time screen surface pressure, the real-time cleaning loss rate and the harvester operation quality adjustment strategy.

[0007] The beneficial effect of adopting the technical solution of the present invention is to improve the operation quality by designing a self-adaptive adjustment method for cleaning based on multi-sensor feedback.

[0008] Furthermore, the harvester operation quality adjustment strategy includes: efficiency priority mode, loss priority mode and manual mode.

[0009] The beneficial effects of adopting the above-mentioned further technical solutions are: Multiple modes are easily selectable based on actual needs, improving applicability and user experience. Efficiency priority is suitable for accelerating operational efficiency, ensuring operational efficiency while maintaining losses within limits, and is suitable for conditions requiring rapid operation, such as rush harvesting. Loss priority is suitable for harvesting high-value crops such as seed crops, focusing on minimizing operational losses, and is suitable for conditions where this is particularly important.

[0010] Furthermore, in the efficiency priority mode, according to the real-time bridge pressure of the harvester, the screen surface opening and the fan speed are pre-adjusted respectively by the screen surface opening adjustment motor and the fan speed adjustment motor; it is judged whether the real-time screen surface pressure is within the normal screen surface pressure range; when the screen surface pressure is within the normal screen surface pressure range, the screen surface opening is adjusted to the first preset degree range, and the fan speed is adjusted to the first preset fan speed range; when the screen surface pressure exceeds the normal screen surface pressure range, the screen surface opening is increased to the second preset degree range, and the fan speed is increased to the second preset fan speed range; it is judged whether the real-time cleaning loss rate is within the normal cleaning loss rate range; when the real-time cleaning loss rate exceeds the normal cleaning loss rate range, the screen surface opening is increased to the third preset degree range, and the fan speed is reduced to the third preset fan speed range.

[0011] The beneficial effects of this further technical solution are as follows: the bridge pressure sensor monitors pressure changes in real time. Feed rate and pressure are directly proportional. When feed rate varies, the grain level on the screen surface also changes, and the signal detected by the screen pressure sensor also changes accordingly. Based on the bridge pressure sensor signal, the screen opening adjustment motor and the fan speed adjustment motor are controlled to pre-adjust the screen opening and simultaneously adjust the fan speed for optimal cleaning performance. After pre-adjusting the screen opening based on the bridge pressure sensor signal, it is then adjusted in real time based on the screen pressure sensor signal. When the screen pressure is within the normal range, that is, when the sensor voltage is between 0.5V and 2V, the screen opening is adjusted to between 10 and 40 degrees. Users can also manually adjust the setting via the display screen. Simultaneously, the fan speed is adjusted to between 800 and 1300 RPM to avoid excessive wind speeds that could cause excessive losses, or excessive wind speeds that could lead to poor cleaning performance and a high grain content. When the screen pressure sensor voltage is between 2V and 4V, indicating that the screen pressure exceeds the normal range (indicating that the grain thickness exceeds normal), the controller outputs a screen motor adjustment signal to increase the screen opening to a maximum of 60 degrees, allowing more grain to fall through the screen and onto the auger below the grain. Simultaneously, the fan speed is increased for improved grain cleaning. When the cleaning loss sensor signal is detected as excessive, the controller outputs a screen motor adjustment signal to control the screen adjustment motor to increase the screen opening to a maximum of 60 degrees, allowing more grain to fall through the screen and onto the auger below the grain. This reduces grain on the screen and minimizes grain loss discharged from the rear of the screen box. Simultaneously, the fan speed is reduced to mitigate the impact of wind speed on cleaning efficiency and reduce cleaning loss. When the screen pressure signal is detected, the screen adjustment motor adjusts the screen opening, increasing the screen opening to allow more grain to pass through the gaps between the screen plates and onto the auger below the grain, thereby reducing screen pressure. When the screen surface pressure is low or the cleaning loss is too large, the screen surface opening can be adjusted by the screen adjustment motor to reduce the screen surface opening so that more grain can remain on the screen.

[0012] Furthermore, in the efficiency priority mode, when the real-time cleaning loss rate exceeds the normal cleaning loss rate range, the real-time screen surface opening and the real-time fan speed are obtained respectively through the screen adjustment position sensor and the fan speed adjustment position sensor; it is judged whether the real-time screen surface opening and the real-time fan speed are both adjusted to the limit state; when the real-time screen surface opening and the real-time fan speed are both adjusted to the limit state, it is judged whether the real-time cleaning loss rate is reduced to the normal cleaning loss rate range; when the real-time cleaning loss rate is not reduced to the normal cleaning loss rate range, the vehicle speed is reduced to the first preset vehicle speed range.

[0013] The beneficial effect of adopting the above-mentioned further technical solution is as follows: when the cleaning loss rate exceeds the standard, the screen opening and the fan speed are adjusted. If the cleaning loss rate cannot be reduced below the standard after the screen opening and the fan speed are adjusted to the limit state, then it is necessary to control the vehicle speed. By reducing the vehicle speed, the feed amount is reduced, thereby achieving the purpose of reducing the cleaning loss. In the process of adjusting the fan speed and the screen opening, the real-time adjustment position is closed-loop controlled through the feedback of the fan speed position sensor and the screen adjustment position sensor. When adjusted to the limit, it can be obtained by the controller in real time, which is convenient for the controller to control the vehicle speed, etc. By controlling the vehicle speed, the ultimate goal of reducing losses and improving the quality of work is achieved.

[0014] Furthermore, in the efficiency priority mode, when the real-time cleaning loss rate is within the normal cleaning loss rate range, the screen surface opening and the fan speed are synchronously adjusted with the real-time screen surface pressure as the control factor; when the real-time cleaning loss rate exceeds the normal cleaning loss rate range, the screen surface opening and the fan speed are synchronously adjusted with the real-time cleaning loss rate as the control factor.

[0015] The beneficial effect of adopting the above-mentioned further technical solution is that when the cleaning loss does not exceed the standard, the screen surface pressure sensor is used as the main control factor, and the screen surface opening and fan speed are synchronously adjusted according to the screen surface pressure sensor voltage signal. When the cleaning loss exceeds the standard, the cleaning loss is used as the main control factor, and the screen surface opening and fan speed are synchronously adjusted according to the cleaning loss rate.

[0016] Furthermore, in the loss priority mode, it is determined whether the real-time cleaning loss rate is within the normal cleaning loss rate range; when the real-time cleaning loss rate is within the normal cleaning loss rate range, the screen opening is adjusted to within the fourth preset degree range, and the fan speed is adjusted to within the fourth preset fan speed range; when the real-time cleaning loss rate exceeds the normal cleaning loss rate range, the screen opening is reduced to within the fifth preset degree range, and the fan speed is reduced to within the fifth preset fan speed range.

[0017] The beneficial effects of adopting this further technical solution include adjusting the screen opening and fan speed based on the cleaning loss rate. When the cleaning loss is relatively small, the fan speed and screen opening are increased to achieve better cleaning performance for the operating vehicle. As the cleaning loss changes, the fan speed and screen opening are adjusted in real time to keep the cleaning loss within the set range. When the cleaning loss is excessive, the fan speed and screen opening are reduced to keep the cleaning loss of the operating vehicle within the set range.

[0018] Furthermore, in the loss priority mode, it is determined whether the real-time screen surface pressure is within the normal screen surface pressure range; when the screen surface pressure exceeds the normal screen surface pressure range, the vehicle speed is reduced to within the second preset speed range, and a speed reduction alarm is issued through the display screen.

[0019] The beneficial effect of adopting this further technical solution is that in loss-priority mode, the screen opening and fan speed are adjusted based on cleaning losses. When excessive screen pressure is detected, the vehicle speed is controlled to decrease, reducing the feed rate, thereby reducing the cleaning load and ensuring both cleaning losses and cleaning results are at optimal values. During speed reduction, a speed reduction alarm is displayed on the display, and this information is promptly shared with the operator. By controlling vehicle speed, the ultimate goal of reducing losses and improving operation quality is achieved.

[0020] Furthermore, in manual mode, the screen opening, fan speed and vehicle speed of the harvester are adjusted respectively according to the screen opening adjustment instructions, fan speed adjustment instructions and vehicle speed adjustment instructions input by the user through the knob; the range of the screen opening and the range of the fan speed are calibrated respectively according to the maximum screen opening, minimum screen opening, maximum fan speed and minimum fan speed input by the user received on the display screen; the automatic control function of the operation quality is turned on and off according to the instructions received by the automatic control button; when the operation quality is automatically controlled, it is detected whether the vehicle is in the operation state; when the vehicle is in the operation state, the steps of obtaining the real-time bridge pressure, real-time screen pressure, real-time cleaning loss rate and harvester operation quality adjustment strategy of the harvester are executed.

[0021] The beneficial effect of adopting the above-mentioned further technical solution is that the knobs can adjust the screen opening and the fan speed respectively. The screen opening adjustment knob can adjust the screen opening, and the fan speed adjustment knob can adjust the fan speed. The maximum and minimum values ​​of the screen opening can be calibrated through the display screen, and the limit value of the screen opening can be set on the display screen, and then manually set using the knob. The maximum and minimum values ​​of the fan speed can be calibrated through the display screen, and the limit value of the fan speed can be set on the display screen, and then manually set using the knob. The user can manually select whether to turn on the automatic operation quality control function. After the automatic operation quality control function is turned on, the vehicle operation status is detected.

[0022] In addition, the present invention also provides a harvester operation quality adjustment system for realizing the above-mentioned harvester operation quality adjustment method, the harvester operation quality adjustment system includes: a bridge pressure sensor, a screen surface pressure sensor, a cleaning loss sensor, a controller, a vehicle speed control mechanism, a fan speed adjustment mechanism and a screen opening adjustment mechanism, the bridge pressure sensor, the screen surface pressure sensor, the cleaning loss sensor, the vehicle speed control mechanism, the fan speed adjustment mechanism and the screen opening adjustment mechanism are all connected to the controller; the bridge pressure sensor is used to obtain real-time bridge pressure; the The screen surface pressure sensor is used to obtain the real-time screen surface pressure; the cleaning loss sensor is used to obtain the real-time cleaning loss rate; the controller is used to obtain the harvester operation quality adjustment strategy; the controller is also used to generate adjustment instructions for adjusting the harvester's screen surface opening, fan speed and vehicle speed based on the real-time bridge pressure, the real-time screen surface pressure, the real-time cleaning loss rate and the harvester operation quality adjustment strategy; the screen opening adjustment mechanism is used to adjust the harvester's screen surface opening; the fan speed control mechanism is used to adjust the fan speed; the vehicle speed control mechanism is used to adjust the vehicle speed.

[0023] The beneficial effects of the technical solution of the present invention are as follows: the bridge pressure sensor can detect the amount of crop fed and the bridge pressure during operation. The pressure detected by the bridge pressure sensor will change with the amount of crop fed. The signal can be converted into a feed amount signal and a bridge pressure through calibration. The bridge pressure sensor can detect the amount of crop fed during operation. The pressure detected by the bridge pressure sensor will change with the amount of crop fed. The signal can be converted into a feed amount signal through calibration. The screen surface pressure sensor is installed at the bottom of the screen surface and can detect the screen surface pressure in real time. The more material on the screen surface, the more the pressure signal detected by the screen surface pressure sensor will change. The voltage signal can be converted into a screen surface grain thickness signal through calibration, and finally into the screen surface load size. The cleaning loss sensor can detect the loss of grains entrained in the chaff discharged from the rear of the screen box. By designing a self-adaptive cleaning adjustment method based on multi-sensor feedback, the operation quality is improved.

[0024] Furthermore, the controller is connected to a fan speed position sensor, a screen opening position sensor, a vehicle speed sensor and a display screen; the bridge pressure sensor is installed on the bridge of the harvester, the screen surface pressure sensor is installed at the bottom of the screen surface, and the cleaning loss sensor is installed at the rear of the screen box. The fan speed regulation mechanism includes: a fan speed regulation motor and a fan stepless speed regulation transmission wheel. The fan of the harvester is connected to the fan drive shaft. The fan stepless speed regulation transmission wheel is connected to the main drive shaft of the harvester through a belt. The fan stepless speed regulation transmission wheel includes: a moving plate and a fixed plate. The fixed plate is fixedly installed on the fan drive shaft. The moving plate can be slidably installed on the fan drive shaft along the axial direction of the fan drive shaft. The moving plate is rotatably connected to the ear plate. The output shaft of the fan speed regulation motor is connected to the ear plate through a connecting rod. The fan speed regulation position sensor is connected to the output shaft of the fan speed regulation motor, and the fan speed regulation motor is connected to the controller.

[0025] The beneficial effects of adopting this further technical solution are as follows: A bridge pressure sensor, installed on the bridge, detects the amount of crop fed during operation. The pressure detected by the bridge pressure sensor changes with the amount of crop fed. Calibration converts this signal into a feed rate signal. A screen pressure sensor, installed below the screen surface, monitors the screen surface pressure in real time. The more material on the screen surface, the more the pressure signal detected by the screen pressure sensor changes. Calibration converts the voltage signal into a grain thickness signal, ultimately converting it to the screen surface load. A cleaning loss sensor, installed at the rear of the screen box, detects the loss of grain entrained in the chaff discharged from the rear of the screen box. The fan is powered by the main drive shaft after the engine, which transmits power to the fan's continuously variable speed drive pulley via a belt. The fan's continuously variable speed drive pulley consists of a fixed disc and a moving disc. A larger gap between the two discs results in belt drop, a smaller transmission radius, and a lower fan speed. The fan speed motor drives the moving disc toward or away from the fixed disc via a connecting rod, reducing or increasing the gap between the moving disc and the fixed disc. The fan speed motor also directly adjusts the fan drive wheel's transmission radius via the connecting rod, thereby adjusting the fan speed. The fan speed position sensor provides feedback on the fan speed motor's position. The controller receives signals from sensors such as the screen pressure sensor, cleaning loss sensor, fan speed position sensor, and screen opening position sensor. After logical processing, it outputs signals to control the fan speed motor, screen opening adjustment motor, and vehicle movement. The display screen can display diagnostic information for sensor signals and can also calibrate required settings.

[0026] Advantages of additional aspects of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments. It should be understood that the following drawings only illustrate certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying any creative work.

[0028] Figure 1 One of the schematic flow charts of the harvester operation quality adjustment method provided by an embodiment of the present invention; Figure 2 A second schematic flow chart of the method for adjusting the harvester operation quality provided by an embodiment of the present invention; Figure 3 This is one of the structural diagrams of the harvester operation quality adjustment system provided by an embodiment of the present invention; Figure 4 The second structural diagram of the harvester operation quality adjustment system provided by the embodiment of the present invention; Figure 5 This is the third structural diagram of the harvester operation quality adjustment system provided in an embodiment of the present invention.

[0029] Explanation of the accompanying figures: 1. Bridge pressure sensor; 2. Screen surface pressure sensor; 3. Cleaning loss sensor; 4. Controller; 5. Fan speed position sensor; 6. Screen surface opening position sensor; 7. Vehicle speed sensor; 8. Display screen; 9. Fan speed motor; 10. Fan drive shaft; 11. Moving plate; 12. Fixed plate; 13. Connecting rod. DETAILED DESCRIPTION

[0030] The principles and features of the present invention are described below with reference to the accompanying drawings. The embodiments given are only used to explain the present invention and are not used to limit the scope of the present invention.

[0031] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings herein can be arranged and designed in various different configurations.

[0032] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention as claimed, but rather merely represents selected embodiments of the present invention. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without creative effort shall fall within the scope of protection of the present invention.

[0033] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings.

[0034] In the description of the embodiments of the present invention, it should be noted that if the terms "upper", "lower", "horizontal", "inner", etc. appear, the orientation or position relationship indicated is based on the orientation or position relationship shown in the accompanying drawings, or is the orientation or position relationship in which the product of the invention is usually placed when in use. It is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it cannot be understood as a limitation on the present invention.

[0035] In the description of the embodiments of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "disposed," "installed," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0036] like Figure 1 As shown, an embodiment of the present invention provides a method for adjusting the operation quality of a harvester, including: obtaining the real-time bridge pressure, real-time screen surface pressure, real-time cleaning loss rate and harvester operation quality adjustment strategy of the harvester; adjusting the screen surface opening, fan speed and vehicle speed of the harvester according to the real-time bridge pressure, the real-time screen surface pressure, the real-time cleaning loss rate and the harvester operation quality adjustment strategy.

[0037] The beneficial effect of adopting the technical solution of the present invention is to improve the operation quality by designing a self-adaptive adjustment method for cleaning based on multi-sensor feedback.

[0038] Furthermore, the harvester operation quality adjustment strategy includes: efficiency priority mode, loss priority mode and manual mode.

[0039] The beneficial effects of adopting the above-mentioned further technical solutions are: Multiple modes are easily selectable based on actual needs, improving applicability and user experience. Efficiency priority is suitable for accelerating operational efficiency, ensuring operational efficiency while maintaining losses within limits, and is suitable for conditions requiring rapid operation, such as rush harvesting. Loss priority is suitable for harvesting high-value crops such as seed crops, focusing on minimizing operational losses, and is suitable for conditions where this is particularly important.

[0040] Furthermore, in the efficiency priority mode, according to the real-time bridge pressure of the harvester, the screen surface opening and the fan speed are pre-adjusted respectively by the screen surface opening adjustment motor and the fan speed adjustment motor; it is judged whether the real-time screen surface pressure is within the normal screen surface pressure range; when the screen surface pressure is within the normal screen surface pressure range, the screen surface opening is adjusted to the first preset degree range, and the fan speed is adjusted to the first preset fan speed range; when the screen surface pressure exceeds the normal screen surface pressure range, the screen surface opening is increased to the second preset degree range, and the fan speed is increased to the second preset fan speed range; it is judged whether the real-time cleaning loss rate is within the normal cleaning loss rate range; when the real-time cleaning loss rate exceeds the normal cleaning loss rate range, the screen surface opening is increased to the third preset degree range, and the fan speed is reduced to the third preset fan speed range.

[0041] The beneficial effects of this further technical solution are as follows: the bridge pressure sensor monitors pressure changes in real time. Feed rate and pressure are directly proportional. When feed rate varies, the grain level on the screen surface also changes, and the signal detected by the screen pressure sensor also changes accordingly. Based on the bridge pressure sensor signal, the screen opening adjustment motor and the fan speed adjustment motor are controlled to pre-adjust the screen opening and simultaneously adjust the fan speed for optimal cleaning performance. After pre-adjusting the screen opening based on the bridge pressure sensor signal, it is then adjusted in real time based on the screen pressure sensor signal. When the screen pressure is within the normal range, that is, when the sensor voltage is between 0.5V and 2V, the screen opening is adjusted to between 10 and 40 degrees. Users can also manually adjust the setting via the display screen. Simultaneously, the fan speed is adjusted to between 800 and 1300 RPM to avoid excessive wind speeds that could cause excessive losses, or excessive wind speeds that could lead to poor cleaning performance and a high grain content. When the screen pressure sensor voltage is between 2V and 4V, indicating that the screen pressure exceeds the normal range (indicating that the grain thickness exceeds normal), the controller outputs a screen motor adjustment signal to increase the screen opening to a maximum of 60 degrees, allowing more grain to fall through the screen and onto the auger below the grain. Simultaneously, the fan speed is increased for improved grain cleaning. When the cleaning loss sensor signal is detected as excessive, the controller outputs a screen motor adjustment signal to control the screen adjustment motor to increase the screen opening to a maximum of 60 degrees, allowing more grain to fall through the screen and onto the auger below the grain. This reduces grain on the screen and minimizes grain loss discharged from the rear of the screen box. Simultaneously, the fan speed is reduced to mitigate the impact of wind speed on cleaning efficiency and reduce cleaning loss. When the screen pressure signal is detected, the screen adjustment motor adjusts the screen opening, increasing the screen opening to allow more grain to pass through the gaps between the screen plates and onto the auger below the grain, thereby reducing screen pressure. When the screen surface pressure is low or the cleaning loss is too large, the screen surface opening can be adjusted by the screen adjustment motor to reduce the screen surface opening so that more grain can remain on the screen.

[0042] (1) Multi-sensor integrated signal input and integrated feedback.

[0043] (2) The feed volume can be predicted in advance by means of the bridge pressure, and the working parts can be pre-adjusted to achieve the best working effect faster.

[0044] (3) Comprehensively control multiple components such as fan speed, screen opening, vehicle speed, etc. to achieve ideal results.

[0045] Furthermore, in the efficiency priority mode, when the real-time cleaning loss rate exceeds the normal cleaning loss rate range, the real-time screen surface opening and the real-time fan speed are obtained respectively through the screen adjustment position sensor and the fan speed adjustment position sensor; it is judged whether the real-time screen surface opening and the real-time fan speed are both adjusted to the limit state; when the real-time screen surface opening and the real-time fan speed are both adjusted to the limit state, it is judged whether the real-time cleaning loss rate is reduced to the normal cleaning loss rate range; when the real-time cleaning loss rate is not reduced to the normal cleaning loss rate range, the vehicle speed is reduced to the first preset vehicle speed range.

[0046] The beneficial effect of adopting the above-mentioned further technical solution is as follows: when the cleaning loss rate exceeds the standard, the screen opening and the fan speed are adjusted. If the cleaning loss rate cannot be reduced below the standard after the screen opening and the fan speed are adjusted to the limit state, then it is necessary to control the vehicle speed. By reducing the vehicle speed, the feed amount is reduced, thereby achieving the purpose of reducing the cleaning loss. In the process of adjusting the fan speed and the screen opening, the real-time adjustment position is closed-loop controlled through the feedback of the fan speed position sensor and the screen adjustment position sensor. When adjusted to the limit, it can be obtained by the controller in real time, which is convenient for the controller to control the vehicle speed, etc. By controlling the vehicle speed, the ultimate goal of reducing losses and improving the quality of work is achieved.

[0047] Furthermore, in the efficiency priority mode, when the real-time cleaning loss rate is within the normal cleaning loss rate range, the screen surface opening and the fan speed are synchronously adjusted with the real-time screen surface pressure as the control factor; when the real-time cleaning loss rate exceeds the normal cleaning loss rate range, the screen surface opening and the fan speed are synchronously adjusted with the real-time cleaning loss rate as the control factor.

[0048] The beneficial effect of adopting the above-mentioned further technical solution is that when the cleaning loss does not exceed the standard, the screen surface pressure sensor is used as the main control factor, and the screen surface opening and fan speed are synchronously adjusted according to the screen surface pressure sensor voltage signal. When the cleaning loss exceeds the standard, the cleaning loss is used as the main control factor, and the screen surface opening and fan speed are synchronously adjusted according to the cleaning loss rate.

[0049] Furthermore, in the loss priority mode, it is determined whether the real-time cleaning loss rate is within the normal cleaning loss rate range; when the real-time cleaning loss rate is within the normal cleaning loss rate range, the screen opening is adjusted to within the fourth preset degree range, and the fan speed is adjusted to within the fourth preset fan speed range; when the real-time cleaning loss rate exceeds the normal cleaning loss rate range, the screen opening is reduced to within the fifth preset degree range, and the fan speed is reduced to within the fifth preset fan speed range.

[0050] The beneficial effects of adopting this further technical solution include adjusting the screen opening and fan speed based on the cleaning loss rate. When the cleaning loss is relatively small, the fan speed and screen opening are increased to achieve better cleaning performance for the operating vehicle. As the cleaning loss changes, the fan speed and screen opening are adjusted in real time to keep the cleaning loss within the set range. When the cleaning loss is excessive, the fan speed and screen opening are reduced to keep the cleaning loss of the operating vehicle within the set range.

[0051] Furthermore, in the loss priority mode, it is determined whether the real-time screen surface pressure is within the normal screen surface pressure range; when the screen surface pressure exceeds the normal screen surface pressure range, the vehicle speed is reduced to within the second preset speed range, and a speed reduction alarm is issued through the display screen.

[0052] The beneficial effect of adopting this further technical solution is that in loss-priority mode, the screen opening and fan speed are adjusted based on cleaning losses. When excessive screen pressure is detected, the vehicle speed is controlled to decrease, reducing the feed rate, thereby reducing the cleaning load and ensuring both cleaning losses and cleaning results are at optimal values. During speed reduction, a speed reduction alarm is displayed on the display, and this information is promptly shared with the operator. By controlling vehicle speed, the ultimate goal of reducing losses and improving operation quality is achieved.

[0053] Furthermore, in manual mode, the screen opening, fan speed and vehicle speed of the harvester are adjusted respectively according to the screen opening adjustment instructions, fan speed adjustment instructions and vehicle speed adjustment instructions input by the user through the knob; the range of the screen opening and the range of the fan speed are calibrated respectively according to the maximum screen opening, minimum screen opening, maximum fan speed and minimum fan speed input by the user received on the display screen; the automatic control function of the operation quality is turned on and off according to the instructions received by the automatic control button; when the operation quality is automatically controlled, it is detected whether the vehicle is in the operation state; when the vehicle is in the operation state, the steps of obtaining the real-time bridge pressure, real-time screen pressure, real-time cleaning loss rate and harvester operation quality adjustment strategy of the harvester are executed.

[0054] The beneficial effect of adopting the above-mentioned further technical solution is that the knobs can adjust the screen opening and the fan speed respectively. The screen opening adjustment knob can adjust the screen opening, and the fan speed adjustment knob can adjust the fan speed. The maximum and minimum values ​​of the screen opening can be calibrated through the display screen, and the limit value of the screen opening can be set on the display screen, and then manually set using the knob. The maximum and minimum values ​​of the fan speed can be calibrated through the display screen, and the limit value of the fan speed can be set on the display screen, and then manually set using the knob. The user can manually select whether to turn on the automatic operation quality control function. After the automatic operation quality control function is turned on, the vehicle operation status is detected.

[0055] An embodiment of the present invention provides a method for adjusting harvester operation quality. This method can adaptively adjust the cleaning system based on bridge pressure, screen surface pressure, and cleaning loss. Through multi-sensor collaborative feedback, bridge pressure, screen surface pressure, and cleaning loss are simultaneously monitored to establish a multivariable closed-loop control model. Dynamic coupling regulation is achieved by decoupling the interaction between screen opening and fan speed using a fuzzy PID algorithm, achieving multi-objective optimization. Through anti-interference design and adaptive weighting, adaptive operating condition weight coefficients (α, β) are introduced to dynamically adjust the control strategy priority based on crop type and ambient noise.

[0056] By receiving signals from bridge pressure sensors, screen surface pressure sensors, and cleaning loss sensors, and through comprehensive signal processing, the screen surface opening, fan speed, and vehicle speed are comprehensively controlled, thereby achieving the goal of improving operation quality.

[0057] In different modes, different sensor signals are used as the primary control to avoid signal conflicts and improve the comprehensive use of sensor signals. In efficiency priority mode, the bridge pressure and screen surface pressure signals are the primary control, while in loss priority mode, the cleaning loss sensor signal is the primary control.

[0058] During operation, the system monitors the bridge pressure sensor, screen surface pressure sensor, and cleaning loss sensor signals in real time. During normal operation, the bridge pressure sensor and screen surface pressure sensor signals are detected simultaneously. Under normal conditions, the bridge pressure sensor and screen surface pressure sensor signals are directly proportional. A high bridge pressure indicates a high feed rate, which in turn indicates a high volume of crop grain, resulting in a high volume of grain accumulated on the screen surface and, consequently, a high screen surface pressure. Upon detecting the screen surface pressure signal, the screen adjustment motor adjusts the screen opening, increasing the screen opening. This allows more grain to pass through the gaps between the screens and fall onto the seed auger, thereby reducing screen surface pressure. If the screen surface pressure is low or the cleaning loss is excessive, the screen adjustment motor adjusts the screen opening, decreasing it to allow more grain to remain on the screen.

[0059] The specific control logic is as follows: (1) Manual operation: 1) Two knobs are located in the cab to adjust the screen opening and fan speed, respectively. The screen opening adjustment knob adjusts the screen opening, while the fan speed adjustment knob adjusts the fan speed. The adjustment of the screen opening and fan speed is infinite.

[0060] 2) The maximum and minimum screen opening values ​​can be calibrated on the display. The screen opening limit can be set on the display and then manually adjusted using the knob. The screen opening range is 0-60 degrees. The screen opening sensor voltage value can be directly read by the controller and stored as the maximum and minimum screen opening values.

[0061] 3) The maximum and minimum fan speeds can be calibrated on the display. The fan speed limit can be set on the display and manually adjusted using the knob. The fan speed range is 0-1500 rpm. The fan speed adjustment position sensor can be directly read by the controller and stored as the maximum and minimum fan speed position information.

[0062] (2) Automatic control logic: 1) Set the automatic operation quality control button on the switch panel. Users can manually choose whether to turn on the automatic operation quality control function.

[0063] 2) After the automatic operation quality control function is enabled, the vehicle's operating status is detected. The vehicle's operating status can be determined by the position of the threshing clutch operating handle or by the speed of working components such as the grain elevator, waste elevator, or bridge pressure sensor. The threshing clutch operating handle signal is typically a voltage signal between 0.5V and 4.5V. The voltage of the operating handle (threshing clutch operating handle) can be calibrated. The initial voltage of the operating handle is generally around 0.5V to 0.7V, and the voltage in the engaged position of the threshing clutch is generally around 2V to 2.5V. When working components such as the grain elevator and waste elevator are operating, the speed is typically several hundred rpm. Therefore, the control logic is set to indicate that the vehicle is in operation when the speed of the grain elevator or waste elevator is greater than 100 RPM; otherwise, it is considered to be inoperative. The bridge pressure sensor signal can also be used for determination. When crop is fed, the pressure signal of the bridge pressure sensor increases. If the signal exceeds the threshold, the vehicle is considered in operation.

[0064] 3) In operation, the controller receives signals from the screen surface pressure sensor and the cleaning loss sensor. There are two automatic control modes: efficiency priority and loss priority, which can be selected on the display.

[0065] Among them, efficiency priority is applicable to speeding up operational efficiency and ensuring operational efficiency without exceeding the limit of losses. It is applicable to rush harvesting operations and other working conditions that require rapid operations.

[0066] Loss priority applies to harvesting higher-value crops such as seed crops, where the focus is on reducing operating losses, and is applicable to working conditions where the focus is on reducing operating losses.

[0067] In efficiency priority mode, the automatic control logic is as follows: a. The bridge pressure sensor monitors pressure changes in real time. Feed rate and pressure are directly proportional. When feed rate varies, the grain on the screen surface will also change, and the signal detected by the screen pressure sensor will also change accordingly. Based on the signal from the bridge pressure sensor, the screen opening adjustment motor and the fan speed adjustment motor are controlled to adjust the screen opening in advance. Simultaneously, the fan speed is adjusted to achieve the best cleaning effect. The screen pressure sensor provides real-time feedback on the cleaning status.

[0068] Among them, the purpose of the bridge angle sensor is to detect the feed amount. The focus is on early control and early adjustment of the fan speed and screen opening to achieve the best operating effect.

[0069] The screen surface pressure mainly detects the amount of grain on the screen surface. It is a feedback signal, equivalent to closed-loop control, which achieves better control effect.

[0070] b. After pre-adjusting the screen opening according to the bridge pressure sensor signal, make real-time adjustments based on the screen pressure sensor signal.

[0071] c. When the screen surface pressure is within the normal range (i.e., the sensor voltage is between 0.5V and 2V), and the grain thickness is between 0 and 6cm (which is the normal operating range), the screen opening is adjusted to between 10 and 40 degrees. Users can also manually adjust the screen opening via the display. Simultaneously, the fan speed is adjusted to between 800 and 1300 RPM to avoid excessive wind speeds that could cause excessive losses, or low wind speeds that could lead to poor cleaning performance and a high impurity content.

[0072] d. When the screen pressure sensor voltage range is between 2V and 4V, the screen pressure exceeds the normal pressure range, that is, the grain thickness exceeds the normal grain thickness. The controller outputs a screen motor adjustment signal to increase the screen opening to a maximum of 60 degrees, allowing more grain to fall from the screen surface to the auger position at the bottom of the grain. At the same time, the fan speed is increased to achieve better grain cleaning effect.

[0073] e. When the cleaning loss sensor signal is detected to be excessive, the controller outputs a screen motor adjustment signal, controlling the screen adjustment motor to increase the screen opening to a maximum of 60 degrees. This allows more grain to fall from the screen surface to the auger position at the bottom of the grain, reducing the grain on the screen surface and minimizing grain loss discharged from the rear of the screen box. Simultaneously, the fan speed is reduced to minimize the impact of wind speed on the cleaning effect, thereby reducing cleaning losses.

[0074] Among them, under normal operation, the allowable cleaning loss rate detection range is about 0-2%. The maximum value of this signal can be set by the user. To ensure the operation effect, the default value used in the present invention is 1%.

[0075] f. During the automatic control process, the controller will detect the pressure on the screen surface and also take into account the cleaning loss. The harvester cleaning loss rate can be set as 1.5% in this system.

[0076] g. Assuming cleaning losses do not exceed the standard (can be less than or equal to 1%), the screen pressure sensor is the primary control factor. The screen opening and fan speed are synchronously adjusted based on the sensor's voltage signal. The comprehensive adjustment coefficient (K=αX+βY) is used, where α and β are adaptive weight coefficients for the operating conditions, X is the screen opening adjustment parameter, and Y is the fan speed adjustment parameter. The screen opening and fan speed are comprehensively adjusted, and the specific adjustment coefficient will be verified during testing based on the vehicle model.

[0077] When the screen pressure exceeds the normal value by a large margin, the screen opening adjustment is the main method. During the adjustment process, the fan speed needs to be increased to ensure the cleaning effect, but the fan speed adjustment ratio should be smaller than the screen opening adjustment ratio. When the cleaning loss exceeds the normal value by a large margin, the fan speed adjustment ratio should be larger than the screen opening adjustment ratio.

[0078] Comprehensive control is performed based on the signals from the screen pressure sensor and the cleaning loss sensor. Under normal conditions, the screen pressure is approximately 3V, and the cleaning loss is 1%. When the screen pressure significantly exceeds the normal value, the screen opening is primarily adjusted. During this adjustment process, the fan speed needs to be increased to ensure the cleaning effect, but the fan speed adjustment ratio must be smaller than the screen opening adjustment ratio. When the cleaning loss significantly exceeds the normal value, the fan speed adjustment ratio is greater than the screen opening adjustment ratio. Specific parameters are obtained through self-learning and adaptive adjustment based on the cleaning effect.

[0079] h. If cleaning loss exceeds the standard, use the cleaning loss as the primary control factor and adjust the screen opening and fan speed synchronously based on the cleaning loss rate. The comprehensive adjustment coefficient (N = aX + bY) is used, where a and b are adaptive weight coefficients for the operating conditions, X is the screen opening adjustment parameter, and Y is the fan speed adjustment parameter. The screen opening and fan speed are adjusted comprehensively, and the specific adjustment coefficient will be verified during testing based on the vehicle model.

[0080] i. When the cleaning loss rate exceeds the standard, adjust the screen opening and fan speed. If the screen opening and fan speed are adjusted to the limit state and still cannot reduce the cleaning loss rate below the standard, it is necessary to control the vehicle speed. By reducing the speed, the feed amount can be reduced to achieve the purpose of reducing the cleaning loss.

[0081] j. During the adjustment of fan speed and screen opening, feedback from the fan speed position sensor and the screen adjustment position sensor is used to implement closed-loop control of the real-time adjustment position. When the adjustment reaches the limit, the controller can obtain the information in real time, facilitating the controller to control the vehicle speed, etc.

[0082] like Figure 2 As shown, start, 1. Check whether the system self-checks; 2. If self-checks, determine whether the system is normal; 3. If the system is normal, determine whether the cleaning loss rate exceeds the standard; 4. If the cleaning loss rate exceeds the standard, adjust the screen opening and the fan speed; 5. Determine whether the screen opening and the fan speed are adjusted to the limit position; 6. If the screen opening and the fan speed are adjusted to the limit position, reduce the vehicle speed and issue a warning.

[0083] The process after step 2 includes: issuing an alert if the system is abnormal.

[0084] After step 3, if the cleaning loss rate does not exceed the standard, determine whether the grain thickness sensor (screen surface pressure sensor) exceeds the set value. If so, execute step 4. If not, return to step 2. In loss priority mode: a. Adjust the screen opening and fan speed according to the cleaning loss rate. When the cleaning loss is relatively small, increase the fan speed and the screen opening to achieve better cleaning effect of the operating vehicle.

[0085] b. When the cleaning loss changes, adjust the fan speed and screen opening in real time to keep the cleaning loss within the set range.

[0086] c. If the cleaning loss is too large (exceeding the set range), reduce the fan speed and the screen opening to bring the cleaning loss of the operating vehicle within the set range. In the loss priority mode, the user can independently set the loss rate, which is generally less than 1.5% and can be set to 1% or even less.

[0087] In loss-priority mode, the screen opening and fan speed are adjusted based on cleaning losses. If excessive screen pressure is detected (screen pressure sensor signal ≥ 4V), the vehicle speed is reduced, reducing the feed rate and thus minimizing the cleaning load, ensuring both cleaning losses and cleaning results are optimized. During speed reduction, a speed reduction alarm is displayed on the display, providing timely information to the operator.

[0088] (1) Harvest quality detection is performed using bridge pressure sensors, screen surface pressure sensors on the screen, and cleaning loss sensors.

[0089] (2) Synchronous detection is performed through multiple signals, which are used as a comprehensive signal for control.

[0090] (3) Comprehensively control the screen opening and fan speed to achieve the best effect.

[0091] (4) The vehicle speed can also be controlled to achieve the ultimate goal of reducing losses and improving operation quality.

[0092] In addition, the present invention also provides a harvester operation quality adjustment system for realizing the above-mentioned harvester operation quality adjustment method. The harvester operation quality adjustment system includes: a bridge pressure sensor 1, a screen surface pressure sensor 2, a cleaning loss sensor 3, a controller 4, a vehicle speed control mechanism, a fan speed adjustment mechanism and a screen opening adjustment mechanism. The bridge pressure sensor 1, the screen surface pressure sensor 2, the cleaning loss sensor 3, the vehicle speed control mechanism, the fan speed adjustment mechanism and the screen opening adjustment mechanism are all connected to the controller 4; the bridge pressure sensor 1 is used to obtain real-time bridge pressure ; The screen surface pressure sensor 2 is used to obtain the real-time screen surface pressure; the cleaning loss sensor 3 is used to obtain the real-time cleaning loss rate; the controller 4 is used to obtain the harvester operation quality adjustment strategy; the controller 4 is also used to generate adjustment instructions for adjusting the harvester's screen surface opening, fan speed and vehicle speed based on the real-time bridge pressure, the real-time screen surface pressure, the real-time cleaning loss rate and the harvester operation quality adjustment strategy; the screen opening adjustment mechanism is used to adjust the harvester's screen surface opening; the fan speed control mechanism is used to adjust the fan speed; the vehicle speed control mechanism is used to adjust the vehicle speed.

[0093] The beneficial effects of the technical solution of the present invention are as follows: the bridge pressure sensor can detect the amount of crop fed and the bridge pressure during operation. The pressure detected by the bridge pressure sensor will change with the amount of crop fed. The signal can be converted into a feed amount signal and a bridge pressure through calibration. The bridge pressure sensor can detect the amount of crop fed during operation. The pressure detected by the bridge pressure sensor will change with the amount of crop fed. The signal can be converted into a feed amount signal through calibration. The screen surface pressure sensor is installed at the bottom of the screen surface and can detect the screen surface pressure in real time. The more material on the screen surface, the more the pressure signal detected by the screen surface pressure sensor will change. The voltage signal can be converted into a screen surface grain thickness signal through calibration, and finally into the screen surface load size. The cleaning loss sensor can detect the loss of grains entrained in the chaff discharged from the rear of the screen box. By designing a self-adaptive cleaning adjustment method based on multi-sensor feedback, the operation quality is improved.

[0094] Furthermore, the controller 4 is connected to a fan speed control position sensor 5, a screen opening position sensor 6, a vehicle speed sensor 7 and a display screen 8; the bridge pressure sensor 1 is installed on the bridge of the harvester, the screen surface pressure sensor 2 is installed at the bottom of the screen surface, and the cleaning loss sensor 3 is installed at the rear of the screen box. The fan speed control mechanism includes: a fan speed control motor 9 and a fan stepless speed control transmission wheel. The fan of the harvester is connected to a fan drive shaft 10. The fan stepless speed control transmission wheel is connected to the main drive shaft of the harvester through a belt. The fan stepless speed control transmission wheel includes: a moving plate 11 and a fixed plate 12. The fixed plate 12 is fixedly mounted on the fan drive shaft 10. The moving plate 11 can be slidably mounted on the fan drive shaft 10 along the axial direction of the fan drive shaft 10. The moving plate 11 is rotatably connected to an ear plate. The output shaft of the fan speed control motor 9 is connected to the ear plate through a connecting rod 13. The fan speed control position sensor 5 is connected to the output shaft of the fan speed control motor 9, and the fan speed control motor 9 is connected to the controller 4.

[0095] The beneficial effects of adopting this further technical solution are as follows: A bridge pressure sensor, installed on the bridge, detects the amount of crop fed during operation. The pressure detected by the bridge pressure sensor changes with the amount of crop fed. Calibration converts this signal into a feed rate signal. A screen pressure sensor, installed below the screen surface, monitors the screen surface pressure in real time. The more material on the screen surface, the more the pressure signal detected by the screen pressure sensor changes. Calibration converts the voltage signal into a grain thickness signal, ultimately converting it to the screen surface load. A cleaning loss sensor, installed at the rear of the screen box, detects the loss of grain entrained in the chaff discharged from the rear of the screen box. The fan is powered by the main drive shaft after the engine, which transmits power to the fan's continuously variable speed drive pulley via a belt. The fan's continuously variable speed drive pulley consists of a fixed disc and a moving disc. A larger gap between the two discs results in belt drop, a smaller transmission radius, and a lower fan speed. The fan speed motor drives the moving disc toward or away from the fixed disc via a connecting rod, reducing or increasing the gap between the moving disc and the fixed disc. The fan speed motor also directly adjusts the fan drive wheel's transmission radius via the connecting rod, thereby adjusting the fan speed. The fan speed position sensor provides feedback on the fan speed motor's position. The controller receives signals from sensors such as the screen pressure sensor, cleaning loss sensor, fan speed position sensor, and screen opening position sensor. After logical processing, it outputs signals to control the fan speed motor, screen opening adjustment motor, and vehicle movement. The display screen can display diagnostic information for sensor signals and can also calibrate required settings.

[0096] like Figure 3As shown, the harvester operation quality adjustment system provided by the embodiment of the present invention is mainly composed of a bridge angle sensor, a screen surface pressure sensor, a cleaning loss sensor, a fan speed adjustment device (including a fan speed control motor, a stepless speed control structure and a fan speed control position sensor), a screen surface opening adjustment device (including a screen surface opening adjustment motor and a screen surface opening position sensor), a vehicle traveling device (including a vehicle speed controller and a vehicle speed sensor), a vehicle controller, a display screen and other parts.

[0097] (1) Bridge angle sensor: Installed on the bridge, it can detect the amount of crop fed during operation. As the amount of crop fed increases, the angle that the bridge angle sensor can detect will also change. The bridge angle sensor signal is a voltage signal of 0.5V-4.5V. Through calibration, the voltage signal can be converted into a feed amount signal. As an alternative to the bridge angle sensor, a bridge pressure sensor can be used.

[0098] (2) Screen surface pressure sensor: Installed at the bottom of the screen surface, it can detect the screen surface pressure in real time. The more material on the screen surface, the more the pressure signal detected by the screen surface pressure sensor will change. The screen surface pressure sensor signal is a voltage signal of 0.5V-4.5V. Through calibration, the voltage signal can be converted into a screen surface grain thickness signal, and finally into the screen surface load size.

[0099] (3) Cleaning loss sensor: It is installed at the rear of the screen box and can detect the loss of grains entrained in the bran discharged from the rear of the screen box. The greater the loss, the more signals the sensor sends back. The controller receives the signal and at the same time receives the vehicle speed information from the vehicle speed sensor to calculate the real-time cleaning loss rate. The cleaning loss sensor signal is a pulse signal. After the grain hits the cleaning loss sensor, it can generate a pulse signal. By counting the number of pulse signals, the cleaning loss rate can be calculated according to the set grain thousand-grain weight. Among them, the cleaning loss sensor used is a vibration pulse signal, and the loss size is judged by the number of pulses.

[0100] (4) If Figure 4As shown, the fan speed control device (speed control mechanism) includes a fan speed control motor, a stepless speed control mechanism, and a fan speed control position sensor. The fan is powered by the main drive shaft after the engine power is applied. The main drive shaft transmits power to the fan's stepless speed control drive pulley via a belt. The fan's stepless speed control drive pulley is a wedge-shaped structure consisting of a fixed plate and a moving plate. The larger the gap between the two plates, the lower the belt falls, the smaller the transmission radius, and the lower the fan speed. The fan speed control motor can drive the moving plate toward or away from the fixed plate via a connecting rod, thereby reducing or increasing the gap between the moving plate and the fixed plate. The fan speed control motor can directly adjust the transmission radius of the fan drive pulley via a connecting rod, thereby adjusting the fan speed. The fan speed control position sensor provides feedback on the position of the fan speed control motor. In which, a projection with gradually increasing height can be installed on the ear plate, and a baffle is provided at a position adjacent to the ear plate on the fan drive shaft. The projection slides and abuts against the baffle of the fan drive shaft. When the ear plate rotates, the projection abuts against the baffle, pushing the movable plate on the ear plate to move along the axial direction of the fan drive shaft. Alternatively, the middle part of the ear plate is connected to the fan drive shaft through a thread. When the ear plate rotates, it drives the movable plate to move along the axial direction of the fan drive shaft. Alternatively, the electric push rod is connected to the ear plate through a connecting rod, and the ear plate is slidably installed on the fan drive shaft. In which, the fan stepless speed regulation device is divided into a fixed plate and a movable plate. The fan speed regulation motor controls the movement of the movable plate. When the movable plate moves away from the fixed plate, the driving radius decreases and the fan speed decreases. When the movable plate approaches the fixed plate, the driving radius increases and the fan speed increases. The fan speed regulation position sensor feeds back the position of the fan speed regulation motor as adjustment feedback for control.

[0101] (5) If Figure 5 As shown in the figure, the screen opening adjustment device consists of a screen adjustment motor, a screen adjustment mechanism, and a screen opening position sensor. The screen adjustment motor drives a connecting rod through a gear transmission to adjust the screen opening. The screen opening position sensor provides feedback on the screen opening adjustment motor position. The screen opening is controlled by a connecting rod, the lower end of which is fixed to the rotating part of the motor. Left and right rotation of the motor adjusts the screen opening.

[0102] (6) Vehicle running device: The vehicle running device of the embodiment of the present invention can use an electronically controlled HST. This electronically controlled HST is proportionally controlled and the running speed can be controlled by the size of the driving current.

[0103] (7) Vehicle controller (controller): The controller can receive signals from sensors such as grain thickness sensor (screen surface pressure sensor), cleaning loss sensor, fan speed position sensor, screen surface opening position sensor, etc. After logical processing, it outputs signals to control the fan speed control motor, screen surface opening adjustment motor, and vehicle movement.

[0104] (8) Display screen: It can display the sensor and other signal diagnosis, and can also calibrate the position that needs to be set.

[0105] Those skilled in the art will appreciate that all or part of the steps in the above-described method embodiments can be implemented using hardware associated with program instructions. The aforementioned program can be stored in a computer-readable storage medium. When executed, the program performs the steps of the above-described method embodiments. The aforementioned storage medium includes various media capable of storing program code, such as ROM, RAM, magnetic disks, or optical disks.

[0106] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for adjusting the operation quality of a harvester, characterized in that: include: Obtain the harvester's real-time bridge pressure, real-time screen surface pressure, real-time cleaning loss rate, and harvester operation quality adjustment strategy; The screen opening, fan speed and vehicle speed of the harvester are adjusted according to the real-time bridge pressure, the real-time screen surface pressure, the real-time cleaning loss rate and the harvester operation quality adjustment strategy.

2. A method for adjusting the operation quality of a harvester according to claim 1, characterized in that: The harvester operation quality adjustment strategy includes: efficiency priority mode, loss priority mode and manual mode.

3. A method for adjusting the operation quality of a harvester according to claim 2, characterized in that: In efficiency priority mode, the screen opening and fan speed are pre-adjusted by the screen opening adjustment motor and the fan speed adjustment motor respectively according to the real-time bridge pressure of the harvester; Determine whether the real-time screen surface pressure is within the normal screen surface pressure range; When the screen surface pressure is within the normal screen surface pressure range, the screen surface opening is adjusted to within the first preset degree range, and the fan speed is adjusted to within the first preset fan speed range; When the screen surface pressure exceeds the normal screen surface pressure range, the screen surface opening is increased to within the second preset degree range, and the fan speed is increased to within the second preset fan speed range; Determine whether the real-time cleaning loss rate is within the normal cleaning loss rate range; When the real-time cleaning loss rate exceeds the normal cleaning loss rate range, the screen opening is increased to within the third preset degree range, and the fan speed is reduced to within the third preset fan speed range.

4. A method for adjusting the operation quality of a harvester according to claim 3, characterized in that: In the efficiency priority mode, when the real-time cleaning loss rate exceeds the normal cleaning loss rate range, the real-time screen opening and real-time fan speed are obtained through the screen adjustment position sensor and the fan speed adjustment position sensor respectively; Determine whether the real-time screen opening and real-time fan speed are adjusted to the limit state; When the real-time screen opening and the real-time fan speed are adjusted to the limit state, determine whether the real-time cleaning loss rate is reduced to the normal cleaning loss rate range; When the real-time cleaning loss rate is not reduced to within the normal cleaning loss rate range, the vehicle speed is reduced to within the first preset vehicle speed range.

5. A method for adjusting the operation quality of a harvester according to claim 3, characterized in that: In efficiency priority mode, when the real-time cleaning loss rate is within the normal cleaning loss rate range, the screen opening and the fan speed are adjusted synchronously with the real-time screen surface pressure as the control factor; when the real-time cleaning loss rate exceeds the normal cleaning loss rate range, the screen opening and the fan speed are adjusted synchronously with the real-time cleaning loss rate as the control factor.

6. A method for adjusting the operation quality of a harvester according to claim 2, characterized in that: In loss priority mode, determine whether the real-time cleaning loss rate is within the normal cleaning loss rate range; When the real-time cleaning loss rate is within the normal cleaning loss rate range, the screen opening is adjusted to a fourth preset degree range, and the fan speed is adjusted to a fourth preset fan speed range; When the real-time cleaning loss rate exceeds the normal cleaning loss rate range, the screen opening is reduced to within the fifth preset degree range, and the fan speed is reduced to within the fifth preset fan speed range.

7. A method for adjusting the operation quality of a harvester according to claim 2, characterized in that: In loss priority mode, determine whether the real-time screen surface pressure is within the normal screen surface pressure range; When the screen surface pressure exceeds the normal screen surface pressure range, the vehicle speed is reduced to within the second preset speed range, and a speed reduction alarm is issued through the display screen.

8. A method for adjusting the operation quality of a harvester according to claim 2, characterized in that: In manual mode, the screen opening, fan speed and vehicle speed of the harvester are adjusted according to the screen opening adjustment command, fan speed adjustment command and vehicle speed adjustment command input by the user through the knob; the screen opening range and the fan speed range are calibrated according to the maximum screen opening value, minimum screen opening value, maximum fan speed value and minimum fan speed value input by the user received on the display screen; According to the instructions received by the automatic control button, the automatic control function of the operation quality is turned on and off; when the operation quality is automatically controlled, it is detected whether the vehicle is in the operation state; when the vehicle is in the operation state, the steps of obtaining the real-time bridge pressure, real-time screen surface pressure, real-time cleaning loss rate of the harvester and the harvester operation quality adjustment strategy are executed.

9. A harvester operation quality adjustment system, characterized in that: Used to implement a harvester operation quality adjustment method according to any one of claims 1 to 8, the harvester operation quality adjustment system comprises: a bridge pressure sensor, a screen surface pressure sensor, a cleaning loss sensor, a controller, a vehicle speed control mechanism, a fan speed adjustment mechanism, and a screen opening adjustment mechanism, wherein the bridge pressure sensor, the screen surface pressure sensor, the cleaning loss sensor, the vehicle speed control mechanism, the fan speed adjustment mechanism, and the screen opening adjustment mechanism are all connected to the controller; The bridge pressure sensor is used to obtain real-time bridge pressure; The screen surface pressure sensor is used to obtain real-time screen surface pressure; The cleaning loss sensor is used to obtain a real-time cleaning loss rate; The controller is used to obtain a harvester operation quality adjustment strategy; The controller is further configured to generate adjustment instructions for adjusting the screen opening, fan speed, and vehicle speed of the harvester based on the real-time bridge pressure, the real-time screen surface pressure, the real-time cleaning loss rate, and the harvester operation quality adjustment strategy; The screen opening adjustment mechanism is used to adjust the screen opening of the harvester; The fan speed regulating mechanism is used to adjust the fan speed; The vehicle speed control mechanism is used to adjust the vehicle speed.

10. The harvester operation quality adjustment system according to claim 9, characterized in that: The controller is connected to a fan speed position sensor, a screen opening position sensor, a vehicle speed sensor and a display screen; the bridge pressure sensor is installed on the bridge of the harvester, the screen surface pressure sensor is installed at the bottom of the screen surface, and the cleaning loss sensor is installed at the rear of the screen box. The fan speed regulation mechanism includes: a fan speed regulation motor and a fan stepless speed regulation transmission wheel. The fan of the harvester is connected to the fan drive shaft. The fan stepless speed regulation transmission wheel is connected to the main drive shaft of the harvester through a belt. The fan stepless speed regulation transmission wheel includes: a moving plate and a fixed plate. The fixed plate is fixedly mounted on the fan drive shaft. The moving plate can be slidably mounted on the fan drive shaft along the axial direction of the fan drive shaft. The moving plate is rotatably connected to an ear plate. The output shaft of the fan speed regulation motor is connected to the ear plate through a connecting rod. The fan speed regulation position sensor is connected to the output shaft of the fan speed regulation motor, and the fan speed regulation motor is connected to the controller.

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