A method and device for on-demand lubrication control of a chain saw machine based on cutting load

Abstract

The application provides a chain saw machine oil on-demand lubrication control method and device based on cutting load, and relates to the technical field of electric lubrication control. The chain saw machine oil on-demand lubrication control method based on cutting load comprises the following steps: acquiring an electric signal representing the cutting load of a chain saw; determining the driving parameters of an electronic pump according to the electric signal and a preset mapping relationship, wherein the driving parameters comprise pulse frequency and / or duty cycle; and driving the electronic pump to take oil according to the driving parameters, so as to realize on-demand lubrication of the chain saw. The application solves the problems of over-lubrication under light load and under-lubrication under heavy load in the working process of the chain saw.

Description

Technical Field

[0001] This invention relates to the field of electric lubrication control technology, and more specifically, to a method and apparatus for on-demand lubrication control of chainsaw oil based on cutting load. Background Technology

[0002] Existing chainsaw chain lubrication solutions mainly include three types: mechanical follow-up pumps, fixed displacement electronic pumps, and manual press pumps.

[0003] Mechanical follow-up pumps are mechanically driven by a sprocket shaft or clutch cam, with displacement and speed being linked; pumping begins as soon as the chain rotates. Fixed displacement electronic pumps use DC motors or electromagnetic plunger pumps, driven by a controller with pulses at fixed intervals, resulting in a constant displacement. Manually press-pump pumps require the operator to manually press for pre-lubrication and cannot provide continuous lubrication.

[0004] All of the above-mentioned solutions have varying degrees of defects. Mechanical follow-up pumps are bound to the displacement and speed, and cannot be adjusted according to the actual cutting load. When running under light load, continuous oil dripping causes oil waste and environmental pollution, while under heavy load hardwood cutting, the oil supply may be insufficient. Fixed displacement electronic pumps use fixed pulse drive, which does not change with the load, and still have the problems of dry running or over-lubrication. Summary of the Invention

[0005] The problem this invention aims to solve is how to avoid over-lubrication under light loads and under-lubrication under heavy loads.

[0006] To address the aforementioned problems, in a first aspect, the present invention provides a chain saw oil on-demand lubrication control method based on cutting load, comprising: Acquire electrical signals characterizing the chainsaw cutting load; Based on the electrical signal, the driving parameters of the electronic pump are determined according to a preset mapping relationship. The driving parameters include pulse frequency and / or duty cycle. The electronic pump is driven to draw oil according to the driving parameters to achieve on-demand lubrication of the chainsaw.

[0007] Optionally, the electrical signal includes a cutting current; determining the driving parameters of the electronic pump according to the electrical signal and a preset mapping relationship includes: The electrical signal is processed to determine the load response. The required amount of lubricating oil is determined based on the load response. The driving parameters of the electronic pump are determined based on the lubrication requirements. Alternatively, the electrical signal can be compared with at least two preset current thresholds to determine the second load level to which the current load belongs; Based on the second load level, the corresponding pulse frequency and / or duty cycle are retrieved from a preset drive parameter lookup table.

[0008] Optionally, processing the electrical signal to determine the load response includes: The electrical signal is sampled, and the mean current or current envelope of the electrical signal is extracted. Acquire the chain speed and temperature signals of the chainsaw; Based on the average current or current envelope, the chain speed signal, and the temperature signal, and their respective first weights, a comprehensive load index is determined as the load response quantity.

[0009] Optionally, determining the lubrication requirement of the engine oil based on the load response includes: The load deviation is determined based on the comprehensive load index and the preset benchmark load index; The speed deviation is determined based on the current speed and the preset rated speed; The temperature deviation is determined based on the current temperature and the preset reference temperature. The lubrication requirement is determined based on the load deviation, the speed deviation, the temperature deviation, and the preset reference oil supply.

[0010] Optionally, determining the drive parameters of the electronic pump based on the lubrication demand includes: The pulse frequency of the electronic pump is determined based on the lubrication demand and the single-pulse displacement of the electronic pump. The pulse frequency is positively correlated with the lubrication demand and negatively correlated with the single-pulse displacement. Determine the first load level to which the current load belongs; Obtain the flow rate-duty cycle characteristic curve of the electronic pump, and determine the duty cycle of the electronic pump from the flow rate-duty cycle characteristic curve according to the first load level. The duty cycle is positively correlated with the first load level. The electronic pump is driven to perform intermittent pulse oil supply according to the pulse frequency, and the effective oil supply duration within each pulse cycle is adjusted according to the duty cycle.

[0011] Optionally, the chainsaw oil on-demand lubrication control method based on cutting load also includes: The oil viscosity correction factor is determined based on the temperature deviation, and the oil viscosity correction factor is used to reflect the change in oil viscosity at the current temperature relative to the oil viscosity at the reference temperature. Obtain historical current baseline values, and determine wear compensation coefficients based on the difference between the historical current baseline values ​​and the initial current baseline values; The lubrication requirement is corrected based on the oil viscosity correction factor and / or the wear compensation factor to obtain the actual oil supply.

[0012] Optionally, the chainsaw oil on-demand lubrication control method based on cutting load further includes: Get the engine oil level; When the engine oil level is lower than a first preset threshold, an insufficient oil warning signal is issued. When the engine oil level is lower than the second preset threshold, the chainsaw operation is restricted for protection. After implementing the chainsaw operation restriction protection, the oil level is continuously monitored. When the oil level recovers to a level higher than the second preset threshold, the chainsaw operation restriction protection is released.

[0013] Optionally, the step of releasing the chainsaw operation restriction protection when the oil level recovers to above the second preset threshold includes: When the preset conditions are met, the chain is driven to run at a test speed lower than the normal cutting speed. The preset conditions include when the oil level rises back to the third preset threshold and remains at the preset confirmation time. During the trial run, the current feedback signal of the motor or the speed feedback signal of the chain are acquired; the third preset threshold is higher than the second preset threshold, and the difference between the third preset threshold and the second preset threshold is greater than the preset hysteresis. Determine whether the chain meets the effective lubrication conditions based on the current feedback signal or the speed feedback signal. When the lubrication conditions are met, the chainsaw's operation restriction protection is released.

[0014] Optionally, when the engine oil level is lower than the second preset threshold and the battery charge is lower than the preset charge threshold, the preset condition further includes the battery charge recovering to a safe threshold; The on-demand lubrication control method for chainsaw oil based on cutting load also includes: If, during the preset observation period after the chainsaw's restricted operation protection is lifted, the oil level falls below the second preset threshold again, the chainsaw will be stopped.

[0015] The present invention provides a chainsaw oil on-demand lubrication control method based on cutting load. By acquiring an electrical signal characterizing the cutting load and determining drive parameters including pulse frequency and duty cycle according to a preset mapping relationship, the oil supply can be automatically adjusted according to load changes. When the load increases, the oil supply is automatically increased to meet the lubrication requirements of heavy load, and when the load decreases, the oil supply is automatically reduced to avoid idle waste. For example, during idling or light-load cutting, the electronic pump operates at a very low frequency or even stops to reduce oil consumption. During medium-load cutting, oil is supplied at a medium frequency to ensure sufficient chain lubrication. During heavy-load hardwood cutting, oil is supplied at a high frequency and with a large duty cycle to avoid dry chain friction. At the same time, the combined adjustment of pulse frequency and duty cycle achieves precise control of the oil supply rate, taking into account both chain lubrication effect and oil consumption economy. This solves the problem that existing chainsaw lubrication systems cannot dynamically adjust the oil supply according to the actual cutting load, resulting in over-lubrication under light load and under-lubrication under heavy load.

[0016] Secondly, the present invention also provides a chainsaw oil on-demand lubrication control device based on cutting load, which applies the chainsaw oil on-demand lubrication control method based on cutting load as described in any of the above claims, including: The cutting signal sampling module is used to: acquire electrical signals characterizing the cutting load of the chainsaw; The drive parameter determination module is used to: determine the drive parameters of the electronic pump according to the electrical signal and a preset mapping relationship, wherein the drive parameters include pulse frequency and / or duty cycle; The lubrication control module is used to drive the electronic pump to draw oil according to the driving parameters, so as to achieve on-demand lubrication of the chainsaw.

[0017] Thirdly, the present invention provides an electronic device, including a memory and a processor; The memory is used to store computer programs; The processor is configured to, when executing the computer program, implement the on-demand lubrication control method for chainsaw oil based on cutting load as described in the first aspect.

[0018] Fourthly, the present invention provides a computer-readable storage medium storing a computer program that, when executed by a processor, implements the on-demand lubrication control method for chainsaw oil based on cutting load as described in the first aspect.

[0019] The beneficial effects of the chainsaw oil on-demand lubrication control device, electronic device, and computer-readable storage medium based on cutting load provided by this invention compared to the prior art are the same as the beneficial effects of the chainsaw oil on-demand lubrication control method based on cutting load compared to the prior art, and will not be repeated here. Attached Figure Description

[0020] Figure 1This invention illustrates a first flowchart of a chainsaw oil on-demand lubrication control method based on cutting load in an embodiment of the present invention. Figure 2 A schematic diagram of the chainsaw-related architecture is shown in an embodiment of the present invention; Figure 3 This illustrates a second flowchart of the on-demand lubrication control method for chainsaw oil based on cutting load in an embodiment of the present invention. Figure 4 A schematic diagram of the structure of the chainsaw oil on-demand lubrication control device based on cutting load of the present invention is shown; Figure 5 A schematic diagram of the structure of an electronic device according to an embodiment of the present invention is shown. Detailed Implementation

[0021] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0022] It should be noted that relational terms such as "first" and "second" in this invention are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0023] In the description of this specification, references to terms such as "embodiment," "one embodiment," and "one implementation" indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or implementation is included in at least one embodiment or illustrative implementation of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or implementation. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or implementations.

[0024] Reference Figure 1 As shown, this embodiment of the invention proposes a method for on-demand lubrication control of chainsaw oil based on cutting load; The chainsaw oil on-demand lubrication control method based on cutting load includes: S100: Acquires an electrical signal characterizing the chainsaw cutting load.

[0025] Specifically, during the operation of the chainsaw, the motor current changes with the cutting load. The current increases when cutting hardwood or encountering knots, and decreases when idling or cutting softwood. Therefore, the cutting current signal of the motor can be selected as the electrical signal. This electrical signal can be obtained in real time through a current sampling circuit, which includes a sampling resistor or Hall current sensor connected in series in the motor power supply circuit. After amplification and filtering, the sampled signal is sent to the analog-to-digital conversion port of the controller. The sampling frequency of the electrical signal is set according to the control accuracy requirements. For example, it can be set to sample once per millisecond or once per microsecond. The electrical signal can also be other electrical parameters that can reflect the magnitude of the cutting load, such as the estimated value of motor torque, the detected value of chain tension, or the vibration spectrum load characteristics.

[0026] S200: Based on the electrical signal, determine the driving parameters of the electronic pump according to a preset mapping relationship. The driving parameters include pulse frequency and / or duty cycle.

[0027] Specifically, the preset mapping relationship refers to the correspondence rules between electrical signals and drive parameters. These rules are stored in the controller in advance. The pulse frequency in the drive parameters determines the number of times the electronic pump operates per unit time, and the duty cycle determines the effective drive time of the electronic pump in each pulse cycle. Based on the real-time acquired electrical signal, the controller determines the pulse frequency and duty cycle that match the electrical signal by looking up a table or by calculation, so that the oil supply is automatically adjusted according to the change of cutting load. For example, when the amplitude of the electrical signal increases, the controller increases the pulse frequency or increases the duty cycle accordingly through the mapping relationship, and decreases the pulse frequency or decreases the duty cycle accordingly when the amplitude of the electrical signal decreases.

[0028] S300: Drive the electronic pump to draw oil according to the drive parameters to achieve on-demand lubrication of the chainsaw.

[0029] Specifically, the controller integrates a pulse width modulation (PWM) signal generation module. This module generates a corresponding PWM signal based on a determined pulse frequency and duty cycle. This signal is transmitted to the drive circuit of the electronic pump via the controller's output port. The drive circuit is a conventional motor drive circuit, including a power switching element. The power switching element responds to the PWM signal by performing on / off actions. When the pulse signal is high, the power switching element is on, energizing the motor windings or electromagnetic coil of the electronic pump and generating driving force. When the pulse signal is low, the power switching element is off. When the component is turned off, the electric pump stops operating. The oil inlet of the electric pump is connected to the oil reservoir through an oil pipe, and the oil outlet is connected to the oil hole on the guide plate through an oil pipe. Each time the electric pump operates, it draws a certain amount of oil from the oil reservoir and pushes it to the oil hole on the guide plate. After the oil flows out through the oil hole on the guide plate, it is distributed on the contact surface between the chain and the guide plate. The pulse frequency determines the number of times the electric pump operates per unit time, and the duty cycle determines the effective operating time of the electric pump within each pulse cycle. By changing the pulse frequency and duty cycle, the total amount of oil pumped per unit time is controlled, so that the actual oil supply matches the lubrication demand.

[0030] In practical application, this embodiment acquires an electrical signal characterizing the cutting load and determines drive parameters including pulse frequency and duty cycle according to a preset mapping relationship. This allows the oil supply to be automatically adjusted according to load changes. When the load increases, the oil supply is automatically increased to meet heavy-load lubrication needs, and when the load decreases, the oil supply is automatically reduced to avoid idle waste. For example, during idling or light-load cutting, the electronic pump operates at a very low frequency or even stops to reduce oil consumption. During medium-load cutting, oil is supplied at a medium frequency to ensure sufficient lubrication of the chain. During heavy-load hardwood cutting, oil is supplied at a high frequency and with a large duty cycle to prevent dry friction of the chain. At the same time, the combined adjustment of pulse frequency and duty cycle achieves precise control of the oil supply rate, balancing the chain lubrication effect with the economy of oil consumption. This solves the problem that existing chainsaw lubrication systems cannot dynamically adjust the oil supply according to the actual cutting load, resulting in over-lubrication under light load and under-lubrication under heavy load.

[0031] like Figure 2As shown, in one optional embodiment, the chainsaw-related architecture includes a main control microcontroller, a current sampling circuit, a speed detection element, a temperature sensor, an oil level sensor, an electronic oil pump, and an indicator and alarm element. The current sampling circuit is connected in series in the motor power supply circuit to collect cutting current signals. The speed detection element obtains the chain speed through a Hall sensor or back EMF detection method. The temperature sensor is placed near the oil reservoir to detect the oil working temperature. The oil level sensor is placed inside the oil reservoir to monitor the oil level in real time. The input terminals of the main control microcontroller are connected to the current sampling circuit, the speed detection element, the temperature sensor, and the oil level sensor, respectively. The output terminals of the main control microcontroller are connected to the electronic oil pump and the indicator and alarm element, respectively. The main control microcontroller stores an on-demand lubrication strategy and calculates the lubrication demand based on the signals from each sensor before outputting pulse frequency and duty cycle control signals to the electronic oil pump.

[0032] As an optional embodiment of the present invention, the electrical signal includes a cutting current; the step of determining the driving parameters of the electronic pump according to the electrical signal and a preset mapping relationship includes: The electrical signal is processed to determine the load response. Specifically, processing the electrical signal refers to filtering and denoising the sampled current signal and extracting its features. The load response is a quantitative indicator used to characterize the severity of the current cutting load. Its value increases with the increase of the cutting load and decreases with the decrease of the cutting load. Processing methods include calculating the arithmetic mean, moving average, or extracting the current envelope. For example, the current value increases when cutting hardwood or encountering knots, and decreases when cutting softwood or idling. The load response changes accordingly, providing a basis for determining the subsequent oil supply.

[0033] The required amount of lubricating oil is determined based on the load response. Specifically, the lubrication requirement refers to the amount of oil required to maintain effective lubrication between the chain and the guide plate. There is a positive correlation between the lubrication requirement and the load response. The larger the load response, the heavier the cutting load and the greater the required lubrication. This correspondence is calibrated in advance through experiments and stored in the controller. For example, the optimal oil supply is determined through experiments under different load conditions, forming a mapping table or fitting function between the load response and the lubrication requirement.

[0034] The driving parameters of the electronic pump are determined based on the lubrication requirements. Specifically, the driving parameters are determined based on ensuring that the amount of oil pumped by the electronic pump per unit time equals the lubrication demand. According to the correspondence between the displacement characteristics of the electronic pump and the driving parameters, the lubrication demand is converted into the corresponding pulse frequency and duty cycle. The single pulse displacement of the electronic pump is determined by the pump structure. The oil supply per unit time is equal to the pulse frequency multiplied by the single pulse displacement and then multiplied by the duty cycle. For example, when the lubrication demand increases, the pulse frequency or duty cycle is increased; when the lubrication demand decreases, the pulse frequency or duty cycle is decreased.

[0035] In another parallel embodiment, the electrical signal may be compared with at least two preset current thresholds to determine the second load level to which the current load belongs; Specifically, at least two preset current thresholds include a first current threshold and a second current threshold, wherein the first current threshold is less than the second current threshold. The currently sampled current value is compared with the two thresholds respectively. When the current value is less than the first current threshold, it is determined to be an idling or light load level. When the current value is between the first current threshold and the second current threshold, it is determined to be a medium load level. When the current value is greater than the second current threshold, it is determined to be a heavy load level. The continuous current signal is discretized into a finite number of load levels through a hierarchical method.

[0036] Based on the second load level, the corresponding pulse frequency and / or duty cycle are retrieved from a preset drive parameter lookup table.

[0037] Specifically, the drive parameter lookup table pre-stores the pulse frequency and duty cycle values ​​corresponding to each load level. For example, the idling or light load level corresponds to an extremely low frequency or pump stop, the medium load level corresponds to a medium frequency, and the heavy load level corresponds to a high frequency. The controller directly looks up the corresponding pulse frequency and duty cycle based on the determined load level without calculating intermediate quantities. This hierarchical lookup method has low calculation volume and fast response speed.

[0038] In practical applications, this embodiment sets up two parallel mapping relationship determination methods. It can accurately determine the fuel supply through continuous calculation or quickly determine the fuel supply through hierarchical table lookup. Users or manufacturers can flexibly choose according to the control accuracy requirements and the controller's computing power, thus expanding the applicability of the method.

[0039] As an optional embodiment of the present invention, processing the electrical signal to determine the load response includes: The electrical signal is sampled, and the mean current or current envelope of the electrical signal is extracted. Specifically, the controller samples the current signal at a preset sampling frequency using an analog-to-digital converter. The sampling frequency is set according to the motor drive frequency and control accuracy requirements. The average current value is obtained by taking the arithmetic mean of the current values ​​within a preset sampling period, reflecting the average intensity of the cutting load within that period. The current envelope is the upper envelope of the sampled signal, i.e., the current peak sequence within each local time period, reflecting the instantaneous peak level of the cutting load. When extracting the envelope, a sliding window method can be used to take the maximum value. The window duration is set according to the actual working conditions, for example, the window duration can be set to 10 switching cycles or 20 switching cycles to balance response speed and anti-interference capability.

[0040] Acquire the chain speed and temperature signals of the chainsaw; Specifically, the chain speed signal is obtained by detecting the speed of the sprocket or motor through a Hall sensor. The Hall sensor is installed near the sprocket or at the end of the motor. The chain speed is calculated based on the frequency of the Hall pulses. Alternatively, a sensorless back EMF detection method can be used to obtain the motor speed. The chain speed is then calculated from the motor speed and the transmission ratio. The temperature signal is obtained by a temperature sensor located near the oil reservoir or inside the controller. The temperature sensor can be a negative temperature coefficient thermistor or a semiconductor temperature sensor. The temperature signal is used to reflect the working temperature of the engine oil because the viscosity of the engine oil changes significantly with temperature. The higher the temperature, the thinner the engine oil becomes, increasing its fluidity but decreasing its oil film retention capacity.

[0041] Based on the average current or current envelope, the chain speed signal, and the temperature signal, and their respective first weights, a comprehensive load index is determined as the load response quantity.

[0042] Specifically, the formula for calculating the comprehensive load index is as follows: L=kI× +kn×(n-n0)+kT×(T-T0), where L is the comprehensive load index. The current is the average current or current envelope value, n is the current speed, n0 is the rated speed, T is the current temperature, T0 is the reference temperature, kI is the current weighting coefficient, kn is the speed weighting coefficient, and kT is the temperature weighting coefficient. Each weighting coefficient is obtained through experimental calibration. For example, under known load conditions, the current, speed, and temperature values ​​are measured, and the optimal values ​​of each coefficient are determined through regression analysis to maximize the correlation coefficient between the comprehensive load index and the measured lubrication demand. The larger the comprehensive load index, the heavier the current condition and the greater the amount of oil supply required. The introduction of the current envelope enables the index to quickly respond to instantaneous impact loads such as hardwood knots encountered during cutting, avoiding the delayed oil supply caused by relying solely on the average current value for response.

[0043] In practical applications, this embodiment introduces three parameters—average current or envelope, chain speed, and temperature—and uses a weighted approach to calculate the comprehensive load index. This allows the load response to more comprehensively and accurately reflect the actual working conditions. The current envelope can capture instantaneous impact loads during the cutting process, the speed reflects the influence of chain linear speed on lubrication requirements, and the temperature reflects the influence of changes in oil viscosity on the oil supply effect. The combination of these three factors improves the accuracy of lubrication requirement judgment.

[0044] As an optional embodiment of the present invention, determining the lubrication requirement of the engine oil based on the load response includes: The load deviation is determined based on the comprehensive load index and the preset benchmark load index; Specifically, the load deviation is equal to the comprehensive load index L minus the benchmark load index L0, i.e., L-L0. The benchmark load index is the reference value of the comprehensive load index measured under standard operating conditions. When the load deviation is positive, it means that the current load is heavier than the benchmark operating condition and the fuel supply needs to be increased. When the load deviation is negative, it means that the current load is lighter than the benchmark operating condition and the fuel supply can be reduced.

[0045] The speed deviation is determined based on the current speed and the preset rated speed; Specifically, the speed deviation is calculated using the current speed n and the rated speed n0, i.e., n / n0-1. This value reflects the degree of deviation of the current chain linear speed from the rated speed. The higher the speed, the faster the chain causes the lubricating oil to leak out, and the required oil supply also increases accordingly.

[0046] The temperature deviation is determined based on the current temperature and the preset reference temperature. Specifically, the temperature deviation is equal to the current temperature T minus the reference temperature T0, i.e., T-T0. This value reflects the degree of deviation of the oil's operating temperature from the reference temperature. When the temperature rises, the oil viscosity decreases and the fluidity increases, but the oil film becomes thinner and easier to leak, requiring compensation for the oil supply.

[0047] The lubrication requirement is determined based on the load deviation, the speed deviation, the temperature deviation, and the preset reference oil supply.

[0048] Specifically, the formula for calculating lubrication requirements is as follows: Q_oil = Q_base × [1 + a × (L - L0) + b × (n / n0 - 1) + c × (T - T0)], where Q_oil is the lubrication requirement, Q_base is the base oil supply, L is the comprehensive load index, L0 is the base load index, n is the current speed, n0 is the rated speed, T is the current temperature, T0 is the base temperature, a is the load calibration coefficient, b is the speed calibration coefficient, and c is the temperature calibration coefficient. The above calibration coefficients are obtained through experimental calibration. When a is greater than zero, it means that the greater the load, the greater the oil supply; when b is greater than zero, it means that the higher the speed, the greater the oil supply; and when c is greater than zero, it means that the higher the temperature, the greater the oil supply.

[0049] In practical applications, this embodiment obtains the lubrication requirement by multiplying the load deviation, speed deviation, and temperature deviation by their respective calibration coefficients, summing them, and then multiplying by the reference oil supply. This achieves a quantitative synthesis of multiple factors affecting lubrication requirements. The experimental calibration coefficients can be flexibly adjusted according to different machine models and operating conditions, making the method highly adaptable.

[0050] As an optional embodiment of the present invention, determining the drive parameters of the electronic pump based on the lubrication demand includes: The pulse frequency of the electronic pump is determined based on the lubrication demand and the single-pulse displacement of the electronic pump. The pulse frequency is positively correlated with the lubrication demand and negatively correlated with the single-pulse displacement. Specifically, the pulse frequency f is obtained by dividing the lubrication demand Q_oil by the single pulse displacement q, i.e., f=Q_oil / q. The single pulse displacement q is the amount of oil pumped by the electronic pump per action, in milliliters per pulse, which is determined by the pump structure and calibrated by actual measurement. This formula converts the lubrication demand per unit time into the number of pulses required per second.

[0051] Determine the first load level to which the current load belongs; Specifically, the first load level is a load classification determined based on the comparison between the comprehensive load index and a preset threshold. The preset threshold includes a first-level threshold and a second-level threshold, wherein the first-level threshold is less than the second-level threshold. When the comprehensive load index is less than the first-level threshold, it is determined to be a light load level. When the comprehensive load index is between the first-level threshold and the second-level threshold, it is determined to be a medium load level. When the comprehensive load index is greater than the second-level threshold, it is determined to be a heavy load level.

[0052] Obtain the flow rate-duty cycle characteristic curve of the electronic pump, and determine the duty cycle of the electronic pump from the flow rate-duty cycle characteristic curve according to the first load level. The duty cycle is positively correlated with the first load level. Specifically, the flow duty cycle characteristic curve reflects the relationship between the duty cycle and the oil output of the electronic pump. Different electronic pumps have different characteristic curves due to their structural differences, which need to be determined in advance through experiments. The higher the load level, the larger the duty cycle value should be to ensure sufficient oil output within a single pulse. For example, a smaller duty cycle corresponds to a light load level, while a larger duty cycle corresponds to a heavy load level.

[0053] The electronic pump is driven to perform intermittent pulse oil supply according to the pulse frequency, and the effective oil supply duration within each pulse cycle is adjusted according to the duty cycle.

[0054] Specifically, the controller outputs two control signals simultaneously: one is a frequency signal that controls the pump's start-stop rhythm, and the other is a duty cycle signal that controls the pump's effective operating time within each cycle. The actual oil supply rate is approximately equal to the pulse frequency multiplied by the single pulse displacement and then multiplied by the duty cycle. The actual fuel supply rate V_oil is approximately equal to the pulse frequency f multiplied by the single pulse displacement q and then multiplied by the duty cycle D, that is, fuel supply rate = f × q × D; Since f = Q_oil / q, substituting the values, we get V_oil = (Q_oil / q) × q × D = Q_oil × D, where q is the single-pulse displacement in milliliters per pulse, Q_oil is the lubrication requirement in milliliters per minute, and D is the duty cycle, which is dimensionless and ranges from 0 to 1.

[0055] In practical applications, this embodiment uses pulse frequency and duty cycle to control different dimensions of oil supply, making oil supply control more precise and flexible. Pulse frequency is used for coarse adjustment of oil supply, while duty cycle is used for fine adjustment of single-pulse oil output. The combination of the two ensures that the oil supply rate matches the lubrication demand and allows for fine adjustment of oil supply according to changes in load level.

[0056] As an optional embodiment of the present invention, the chainsaw oil on-demand lubrication control method based on cutting load further includes: The oil viscosity correction factor is determined based on the temperature deviation, and the oil viscosity correction factor is used to reflect the change in oil viscosity at the current temperature relative to the oil viscosity at the reference temperature. Specifically, the temperature deviation has already been determined in the step of determining the lubrication requirement based on the load response. The oil viscosity correction factor is determined by estimating the viscosity correction factor from the temperature using a viscosity-temperature approximation formula. Oil viscosity decreases with increasing temperature, and the two approximately satisfy an exponential relationship, as shown in the formula: η=η0 exp[-λ (T-T0)]; Where η is the oil viscosity at the current temperature T, η0 is the oil viscosity at the reference temperature T0, and λ is the temperature sensitivity coefficient, obtained through experimental calibration; from this formula, the viscosity correction coefficient can be obtained as: η / η0=exp[-λ [(T-T0)], or, using a temperature range lookup table method, the temperature range is divided into several intervals, each interval corresponding to a different viscosity correction coefficient. For example, the first correction coefficient corresponds to the interval from -10℃ to 0℃, the second correction coefficient corresponds to the interval from 0℃ to 20℃, and the third correction coefficient corresponds to the interval from 20℃ to 40℃. Each correction coefficient is obtained through experimental calibration.

[0057] Obtain historical current baseline values, and determine wear compensation coefficients based on the difference between the historical current baseline values ​​and the initial current baseline values; Specifically, the historical current baseline value is a value obtained by long-term statistical analysis of the average current under the same operating conditions. It is extracted using a long-period moving average method to filter out short-term fluctuations. The initial current baseline value is the average current measured under the same operating conditions when the chainsaw leaves the factory or is used for the first time. The difference between the two is ΔI_wear = I_base - I0, where I_base represents the baseline average current under the same operating conditions within the current statistical period, and I0 represents the initial current baseline value measured under the same operating conditions when the chainsaw leaves the factory or is used for the first time. ΔI_wear represents the difference between the two. An increase in this difference reflects increased wear on the chain and guide plate, resulting in increased cutting resistance. Accordingly, the oil supply needs to be increased adaptively to compensate for the additional heat generated by wear. The wear compensation coefficient is positively correlated with this difference; the larger the difference, the larger the compensation coefficient. The quantitative relationship between the two is determined through experimental calibration.

[0058] The lubrication requirement is corrected based on the oil viscosity correction factor and / or the wear compensation factor to obtain the actual oil supply.

[0059] Specifically, there are three ways to combine the oil viscosity correction factor and the wear compensation factor.

[0060] When the correction is made only based on the oil viscosity correction factor, the actual oil supply is equal to the lubrication demand multiplied by the correction factor that only includes the temperature term, i.e., Q = Q_oil × (1 + α × (T - T0)), where Q is the actual oil supply, Q_oil is the lubrication demand, α is the temperature calibration factor, T is the current temperature, and T0 is the reference temperature. When correction is made only based on the wear compensation coefficient, the actual oil supply is equal to the lubrication demand multiplied by the correction coefficient that only includes the wear term, i.e., Q=Q_oil×(1+β×ΔI_wear), where β is the wear calibration coefficient and ΔI_wear is the wear current drift, which is equal to the difference between the historical current baseline value and the initial current baseline value. When both the oil viscosity correction factor and wear compensation factor are applied, the actual oil supply equals the lubrication demand multiplied by the adaptive correction factor, which includes temperature and wear terms. That is, Q = Q_oil × K_adj, where K_adj = 1 + α × (T - T0) + β × ΔI_wear, and K_adj is the adaptive correction factor. The adaptive correction factor can be clamped with upper and lower limits to prevent overcompensation. For example, the upper limit can be set to 1.5, and the lower limit to 0.7. When the calculated value exceeds this range, the boundary value is used.

[0061] In practical applications, this embodiment combines temperature compensation and wear compensation with the basic lubrication requirements to maintain an appropriate level of oil supply across the entire temperature range and the entire lifespan of the chain. Temperature compensation addresses the issues of easy loss of thin oil at high temperatures and poor fluidity of thick oil at low temperatures, while wear compensation addresses the issues of increased resistance and heat generation after chain wear. Together, they improve the adaptability and robustness of oil supply control.

[0062] like Figure 3 As shown, as an optional embodiment of the present invention, the chainsaw oil on-demand lubrication control method based on cutting load further includes: Get the engine oil level; Specifically, the oil level is acquired in real time by a level sensor installed in the oil reservoir. The level sensor can be a capacitive level sensor, a float level sensor, or a photoelectric level sensor. The sensor outputs a continuous level value or a level switch signal, which is sent to the signal input port of the controller. The controller's analog-to-digital conversion module or input capture module reads the signal at a set sampling period. The sampling period is set according to the rate of change of the oil level, and is generally set to sample once every 50 milliseconds to every 200 milliseconds.

[0063] When the engine oil level is lower than a first preset threshold, an insufficient oil warning signal is issued. Specifically, the controller compares the sampled current liquid level value with a first preset threshold stored in the memory. The first preset threshold is the oil level warning trigger value, which is pre-calibrated based on the total volume of the oil reservoir and the sensor installation position. For example, when the total volume of the oil reservoir is 200ml, the first preset threshold can be set to 30ml of the remaining liquid level. When the liquid level is lower than this threshold, it indicates that the oil is about to run out. The controller controls the indicator light to flash through the indicator light drive circuit, or controls the buzzer to emit intermittent sounds through the buzzer drive circuit, reminding the user to add oil in time. After the warning signal is issued, the chainsaw can still work normally, and the user can perform the oil replenishment operation after the current operation is completed.

[0064] When the engine oil level is lower than the second preset threshold, the chainsaw operation is restricted for protection. Specifically, the controller compares the current liquid level with a second preset threshold stored in the memory. The second preset threshold is a protection trigger value that is lower than the first preset threshold. For example, when the first preset threshold corresponds to a remaining volume of 20ml, the second preset threshold can be set to a remaining volume of 5ml, indicating that the oil is close to empty. When the liquid level is lower than this threshold, the controller implements a protection measure to restrict the chain's operation. This protection method includes locking the high-speed gear and limiting the maximum speed. Locking the high-speed gear means prohibiting the controller from responding to the high-speed gear switch signal. Limiting the maximum speed means limiting the maximum allowable speed of the chain to less than 30% of the normal cutting speed, so that the chainsaw can only operate at a very low speed or only be allowed to test at a low speed, avoiding dry grinding caused by entering the normal cutting speed in a state of insufficient oil.

[0065] After implementing the chainsaw operation restriction protection, the oil level is continuously monitored. When the oil level recovers to a level higher than the second preset threshold, the chainsaw operation restriction protection is released.

[0066] Specifically, after the operation restriction protection is triggered, the controller continues to read the output signal of the liquid level sensor at the same sampling period. Once it detects that the current liquid level value is greater than the second preset threshold, it indicates that the user has added oil to the oil can. The controller then clears the operation restriction protection flag, resumes the response to the high-speed gear signal, and removes the maximum speed limit, so that the chainsaw returns to normal working status.

[0067] In practical application, this embodiment achieves graded management of engine oil level by setting two levels of oil level thresholds. The first level of warning notifies the user to add oil in advance when the engine oil is about to run out, and the second level of protection forcibly limits the chain speed when the engine oil is almost empty. This effectively prevents dry friction damage between the chain and the guide plate caused by lack of oil, and also provides the user with sufficient buffer time to add oil, avoiding the impact of sudden shutdown on work efficiency.

[0068] like Figure 3 As shown, in an optional embodiment of the present invention, the step of releasing the chainsaw operation restriction protection when the oil level recovers to a level higher than the second preset threshold includes: When the preset conditions are met, the chain is driven to run at a test speed lower than the normal cutting speed. The preset conditions include when the oil level rises back to the third preset threshold and remains at the preset confirmation time. Specifically, the third preset threshold is the unlocking liquid level threshold, which is higher than the second preset threshold and the difference between the two is greater than the preset hysteresis. The preset hysteresis is, for example, 20%-30% of the volume corresponding to the second preset threshold, to ensure that there is a sufficient interval between the third preset threshold and the second preset threshold, so as to avoid repeated locking and unlocking caused by slight fluctuations in the liquid level near the second preset threshold, which would cause protective oscillations. The preset confirmation time is 3s-5s. After the liquid level rises back to the third preset threshold, the controller must maintain this confirmation time before entering the trial operation phase. This time setting is used to filter out instantaneous high readings caused by liquid level fluctuations or oil splashes during oil replenishment, so as to avoid misjudging that the oil has been replenished due to instantaneous liquid level jumps. The trial operation speed refers to a preset low speed value lower than the normal cutting speed, such as 10%-20% of the normal cutting speed. At this speed, the chain running resistance is small, and even if the lubrication is not fully established, it will not cause obvious damage. At the same time, this speed is sufficient to distribute the lubricating oil to the contact surface between the chain and the guide plate under the action of centrifugal force and gravity.

[0069] During the trial run, the current feedback signal of the motor or the speed feedback signal of the chain are acquired; the third preset threshold is higher than the second preset threshold, and the difference between the third preset threshold and the second preset threshold is greater than the preset hysteresis. Specifically, during the test run of the drive chain, the real-time operating current of the motor or the actual speed of the chain is continuously collected. The current feedback signal is obtained through the current sampling circuit, and the speed feedback signal is obtained through the Hall sensor or the back EMF detection circuit. The sampling frequency is the same as during normal cutting to ensure that detailed features in the current signal, such as the spike pulses that appear during dry grinding, can be captured.

[0070] Determine whether the chain meets the effective lubrication conditions based on the current feedback signal or the speed feedback signal. Specifically, the criteria for determining the effective lubrication conditions are whether the test run current falls within the preset normal current range and whether there are dry friction spikes in the current signal. The normal current range is the current range under good lubrication conditions at the same speed. This range is pre-calibrated through experiments and stored in the controller. Dry friction spikes refer to pulse waveforms in the current signal with amplitudes exceeding the upper limit of the normal current range and extremely short durations. This feature indicates that there is dry friction between the chain and the guide plate. When the test run current value is within the normal current range and there are no dry friction spikes in the signal, it is determined that the effective lubrication conditions are met.

[0071] When the lubrication conditions are met, the chainsaw's operation restriction protection is released.

[0072] Specifically, after determining that the effective lubrication conditions are met, the controller clears the restricted operation protection flag, releases the lock on the high-speed gear and the maximum speed limit, and allows the chainsaw to resume normal cutting speed operation. If the test run current value deviates from the normal current range or there are dry grinding peak characteristics in the signal, it is determined that the lubrication has not been effectively established. The controller maintains the restricted operation protection state and reminds the user again to check the oil level or whether the oil replenishment operation is in place through the indicator light or buzzer.

[0073] In practical applications, this embodiment avoids frequent triggering and deactivation of protection caused by repeated oscillations of the liquid level at the critical point by setting a hysteresis judgment. It also filters out misjudgments caused by liquid level fluctuations during oil replenishment by continuously confirming the duration of the process. Furthermore, it verifies whether lubrication is truly established by using current or speed feedback during low-speed test runs. This triple judgment mechanism ensures that the oil replenishment operation is effective and that high-speed cutting is only resumed after the lubricating oil has actually reached the contact surface between the chain and the guide plate. This effectively prevents dry grinding damage caused by insufficient oil replenishment or misreading of the liquid level sensor.

[0074] like Figure 3 As shown, in an optional embodiment of the present invention, when the oil level is lower than the second preset threshold and the battery charge is lower than the preset charge threshold, the preset condition further includes the battery charge recovering to a safe threshold. It is understandable that both the preset power threshold and the safety threshold are percentage thresholds of the remaining battery power. The preset power threshold is the critical value for triggering low power protection, and the safety threshold is the power recovery value required to release low power protection. Both are obtained through the battery management system. For example, the preset power threshold is 20% of the remaining power, and the safety threshold is 30% of the remaining power. The safety threshold is greater than the preset power threshold to ensure that the battery has been charged sufficiently when unlocking. When the operation restriction protection is triggered by both the oil level falling below the second preset threshold and the battery power falling below the preset power threshold, the controller must confirm that the oil level has recovered to the third preset threshold and maintain the preset confirmation time. At the same time, the battery power must recover to the safety threshold before entering the trial operation speed drive chain operation stage. The battery power signal is obtained through the power monitoring interface of the battery management system. If the operation restriction protection is triggered only by the oil level falling below the second preset threshold and the battery power is normal, there is no need to wait for the battery power to recover; the trial operation stage can be entered directly according to the oil level recovery conditions.

[0075] The on-demand lubrication control method for chainsaw oil based on cutting load also includes: If, during the preset observation period after the chainsaw's restricted operation protection is lifted, the oil level falls below the second preset threshold again, the chainsaw will be stopped.

[0076] Specifically, the preset observation period is a set duration, such as 30s to 60s, calculated from the moment the protection is released. This period is used to monitor the stability of the liquid level after oil replenishment. During this observation period, the controller continuously monitors the output signal of the liquid level sensor. If the liquid level drops below the second preset threshold again during the observation period, it indicates that there may be problems such as oil leakage, insufficient oil replenishment, or abnormal oil circuit. The controller directly controls the chainsaw to enter the shutdown protection state. This shutdown protection is a non-automatic recovery protection method. After the chainsaw stops running, the user must manually reset it or troubleshoot the fault before it can be restarted. This avoids the risk of the chain continuously bearing dry friction due to repeated oil replenishment and unlocking under abnormal conditions.

[0077] In practical application, this embodiment further enhances the safety and reliability of the chainsaw by superimposing low-battery protection linkage conditions and observation period aggravated protection on the basis of low oil protection. When both are triggered, the trial operation and verification stage can only be entered after both are restored. This avoids damage to the battery caused by deep discharge due to high-speed cutting under low battery conditions. The observation period aggravated protection directly stops the machine and forces the user to check when the liquid level is abnormal and repeated. This effectively prevents continuous dry grinding damage caused by oil leakage or insufficient oil replenishment, forming a protection gradient that gradually increases from warning to speed limit to shutdown.

[0078] In summary, the present invention, through the on-demand oil supply of an electronic pump driven by the cutting load and the linkage of two-stage monitoring of the oil level, avoids the problems of over-lubrication under light load and under-lubrication under heavy load. It also effectively prevents dry friction damage due to lack of oil through oil level monitoring and operation restriction protection. At the same time, combined with temperature compensation and wear compensation, the oil supply is maintained at an appropriate level throughout the entire temperature range and the entire life cycle of the chain. This solves the problems of existing chainsaw lubrication systems being unable to dynamically adjust the oil supply according to the actual cutting load and lacking oil shortage protection.

[0079] like Figure 4 As shown, the present invention also provides a chainsaw oil on-demand lubrication control device 200 based on cutting load, which applies the chainsaw oil on-demand lubrication control method based on cutting load as described in the above embodiments, including: The cutting signal sampling module 210 is used to: acquire electrical signals characterizing the cutting load of the chainsaw; The drive parameter determination module 220 is used to: determine the drive parameters of the electronic pump according to the electrical signal and a preset mapping relationship, wherein the drive parameters include pulse frequency and / or duty cycle; The lubrication control module 230 is used to drive the electronic pump to draw oil according to the driving parameters, so as to achieve on-demand lubrication of the chainsaw.

[0080] The specific implementation method of this embodiment can be referred to the corresponding implementation method described above, and will not be described again here.

[0081] like Figure 5As shown, an electronic device 300 provided in this embodiment of the invention includes a memory 310 and a processor 320; the memory 310 is used to store a computer program; the processor 320 is used to implement the on-demand lubrication control method for chainsaw oil based on cutting load as described above when the computer program is executed.

[0082] Those skilled in the art will understand that all or part of the processes in the above embodiments can be implemented by a computer program instructing related hardware. The program can be stored in a non-volatile computer-readable storage medium, and when executed, it can include the processes of the embodiments of the above methods. Any references to memory, storage, databases, or other media used in the embodiments provided by this invention can include non-volatile and / or volatile memory. Non-volatile memory can include read-only memory (ROM), programmable ROM (PROM), electrically programmable ROM (EPROM), electrically erasable programmable ROM (EEPROM), or flash memory. Volatile memory can include random access memory (RAM) or external cache memory. By way of illustration and not limitation, RAM is available in various forms, such as static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), dual data rate SDRAM (DDRSDRAM), enhanced SDRAM (ESDRAM), synchronous link DRAM (SLDRAM), Rambus direct RAM (RDRAM), direct memory bus dynamic RAM (DRDRAM), and memory bus dynamic RAM (RDRAM), etc.

[0083] The above description is merely a specific embodiment of the present invention, enabling those skilled in the art to understand or implement the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features of the invention herein.

[0084] While the present invention has been disclosed above, its scope of protection is not limited thereto. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention, and all such changes and modifications will fall within the scope of protection of the present invention.

Claims

1. A method for on-demand lubrication control of chainsaw machine oil based on cutting load, characterized in that, include: Acquire electrical signals characterizing the chainsaw cutting load; Based on the electrical signal, the driving parameters of the electronic pump are determined according to a preset mapping relationship. The driving parameters include pulse frequency and / or duty cycle. The electronic pump is driven to draw oil according to the driving parameters to achieve on-demand lubrication of the chainsaw.

2. The chain saw oil on-demand lubrication control method based on cutting load according to claim 1, characterized in that, The electrical signal includes cutting current; determining the driving parameters of the electronic pump according to the electrical signal and a preset mapping relationship includes: The electrical signal is processed to determine the load response. The required amount of lubricating oil is determined based on the load response. The driving parameters of the electronic pump are determined based on the lubrication requirements. Alternatively, the electrical signal can be compared with at least two preset current thresholds to determine the second load level to which the current load belongs; Based on the second load level, the corresponding pulse frequency and / or duty cycle are retrieved from a preset drive parameter lookup table.

3. The chain saw oil on-demand lubrication control method based on cutting load according to claim 2, characterized in that, The process of processing the electrical signal to determine the load response includes: The electrical signal is sampled, and the mean current or current envelope of the electrical signal is extracted. Acquire the chain speed and temperature signals of the chainsaw; Based on the average current or current envelope, the chain speed signal, and the temperature signal, and their respective first weights, a comprehensive load index is determined as the load response quantity.

4. The chain saw oil on-demand lubrication control method based on cutting load according to claim 3, characterized in that, The process of determining the lubrication requirement of engine oil based on the load response includes: The load deviation is determined based on the comprehensive load index and the preset benchmark load index; The speed deviation is determined based on the current speed and the preset rated speed; The temperature deviation is determined based on the current temperature and the preset reference temperature. The lubrication requirement is determined based on the load deviation, the speed deviation, the temperature deviation, and the preset reference oil supply.

5. The chain saw oil on-demand lubrication control method based on cutting load according to claim 3 or 4, characterized in that, Determining the drive parameters of the electronic pump based on the lubrication demand includes: The pulse frequency of the electronic pump is determined based on the lubrication demand and the single-pulse displacement of the electronic pump. The pulse frequency is positively correlated with the lubrication demand and negatively correlated with the single-pulse displacement. Determine the first load level to which the current load belongs; Obtain the flow rate-duty cycle characteristic curve of the electronic pump, and determine the duty cycle of the electronic pump from the flow rate-duty cycle characteristic curve according to the first load level. The duty cycle is positively correlated with the first load level. The electronic pump is driven to perform intermittent pulse oil supply according to the pulse frequency, and the effective oil supply duration within each pulse cycle is adjusted according to the duty cycle.

6. The chain saw oil on-demand lubrication control method based on cutting load according to claim 4, characterized in that, Also includes: The oil viscosity correction factor is determined based on the temperature deviation, and the oil viscosity correction factor is used to reflect the change in oil viscosity at the current temperature relative to the oil viscosity at the reference temperature. Obtain historical current baseline values, and determine wear compensation coefficients based on the difference between the historical current baseline values ​​and the initial current baseline values; The lubrication requirement is corrected based on the oil viscosity correction factor and / or the wear compensation factor to obtain the actual oil supply.

7. The chain saw oil on-demand lubrication control method based on cutting load according to claim 1, characterized in that, Also includes: Get the engine oil level; When the engine oil level is lower than a first preset threshold, an insufficient oil warning signal is issued. When the engine oil level is lower than the second preset threshold, the chainsaw operation is restricted for protection. After implementing the chainsaw operation restriction protection, the oil level is continuously monitored. When the oil level recovers to a level higher than the second preset threshold, the chainsaw operation restriction protection is released.

8. The chain saw oil on-demand lubrication control method based on cutting load according to claim 7, characterized in that, The step of releasing the chainsaw operation restriction protection when the oil level recovers to above the second preset threshold includes: When the preset conditions are met, the chain is driven to run at a test speed lower than the normal cutting speed. The preset conditions include when the oil level rises back to the third preset threshold and remains at the preset confirmation time. During the trial run, the current feedback signal of the motor or the speed feedback signal of the chain are acquired; the third preset threshold is higher than the second preset threshold, and the difference between the third preset threshold and the second preset threshold is greater than the preset hysteresis. Determine whether the chain meets the effective lubrication conditions based on the current feedback signal or the speed feedback signal. When the lubrication conditions are met, the chainsaw's operation restriction protection is released.

9. The chain saw oil on-demand lubrication control method based on cutting load according to claim 8, characterized in that, When the engine oil level is lower than the second preset threshold and the battery charge is lower than the preset charge threshold, the preset condition also includes the battery charge recovering to a safe threshold; The on-demand lubrication control method for chainsaw oil based on cutting load also includes: If, during the preset observation period after the chainsaw's restricted operation protection is lifted, the oil level falls below the second preset threshold again, the chainsaw will be stopped.

10. A chainsaw oil on-demand lubrication control device based on cutting load, characterized in that, The application of the on-demand lubrication control method for chainsaw oil based on cutting load as described in any one of claims 1-9 includes: The cutting signal sampling module is used to: acquire electrical signals characterizing the cutting load of the chainsaw; The drive parameter determination module is used to: determine the drive parameters of the electronic pump according to the electrical signal and a preset mapping relationship, wherein the drive parameters include pulse frequency and / or duty cycle; The lubrication control module is used to drive the electronic pump to draw oil according to the driving parameters, so as to achieve on-demand lubrication of the chainsaw.

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