82 results about "Open adjustment" patented technology

The invention discloses a valve opening degree adjusting device and a valve assembly, and relates to the technical field of industrial automation control. The driving piece is arranged on the base plate, the first shaft is in transmission connection with a driving shaft of the driving piece, and a clamping groove is formed in a sliding cavity of the first shaft; the second shaft is provided with an adaptive groove, and the adaptive groove and the clamping groove form a through space; the linkage piece is provided with adaptive teeth, the adaptive teeth are movably arranged in the through space, when the linkage piece is at a first position, the adaptive teeth are in transmission connection with the adaptive grooves, and when the linkage piece is at a second position, the two axial ends of the adaptive teeth are in transmission connection with the clamping grooves and the adaptive grooves correspondingly; the output shaft is in transmission connection with the second shaft. The end, deviating from the second shaft, of the output shaft is provided with a valve body. The control assembly is coupled with the driving part and used for controlling the driving part to rotate by a preset angle according to the received control signal, so that the output shaft drives the valve body to rotate to adjust the flow; and the controller is also used for executing preset actions when the driving part fails. Through the arrangement, the technical problem that the driving failure of the driving piece cannot be effectively handled is solved.

The present invention relates to the field of intelligent regulation technology, and particularly to a constant temperature intelligent valve control system and its control method. The method includes the following steps: receiving the DDC analog control signal in real time through the constant temperature intelligent valve and performing vibration-free judgment in the standby mode and valve adjustment control analysis to generate a valve position opening adjustment control mode and a valve flow adjustment control mode; monitoring the supply and return water temperatures of the constant temperature intelligent valve in real time and calculating the valve temperature difference to obtain the measured temperature difference of the intelligent valve; performing valve adjustment control logic response analysis on the constant temperature intelligent valve to generate a basic regulation mode and a constant regulation mode of the intelligent valve; obtaining the set temperature difference of the intelligent valve and the set return water temperature of the intelligent valve and performing basic regulation processing and constant regulation processing on the constant temperature intelligent valve to execute the corresponding intelligent valve regulation control work. The present invention can automatically adjust the control mode according to actual needs, and has high adaptability, accuracy and energy saving performance.

The invention relates to the technical field of hydrogen circulation components in a fuel cell system, and discloses an ejector structure capable of driving variable nozzle opening by utilizing fluid dynamic pressure, which comprises a shell, a cavity channel of the shell extends to one end to form a gas inlet and extends to the other end to form a gas outlet, and a gas suction port communicated with the cavity channel of the shell is formed in the side part of the shell; a nozzle is installed at the end, away from the air outlet, in the shell, one end of the nozzle extends into the shell to form a spout, the other end of the nozzle extends out of the shell to serve as an air inlet, and a valve body is installed in the nozzle; a gap is formed between the valve body and the nozzle for gas circulation, the valve body comprises a needle valve, and the needle valve can be driven by fluid dynamic pressure to generate displacement in the direction away from the nozzle. According to the ejector structure disclosed by the invention, self-adaptive nozzle opening adjustment can be realized, the hydrogen circulation efficiency and the system response speed are improved, the energy consumption and the maintenance cost are reduced, and the system reliability and the environmental adaptability are improved.

The invention relates to the technical field of gas detection, and discloses a multi-channel detection switching system of a gas measuring instrument, which is characterized in that a collecting and processing unit collects a pressure change sequence output by a pressure transmitter, constructs a first replacement curve based on the pressure change sequence, determines a second replacement curve based on gas flow, and transmits the second replacement curve to a control unit; the first detection switching unit fits the first replacement curve and the second replacement curve, the channels are grouped by adopting a clustering algorithm based on the dynamic characteristics of the channels, and the second detection switching unit compares the pressure-flow curve with the fitted curve; whether the opening degree of the pressure regulating valve is adjusted or not is judged according to the deviation of the pressure-flow curve and the fitting curve, the opening degree adjusting strategy of the pressure regulating valve is determined based on the change of the gas flow and the traversal result of the historical database, the switching gating unit adjusts the opening degree of the pressure regulating valve according to the opening degree adjusting factor, and gating is completed through the adjusted opening degree. According to the invention, the reliability of multi-channel detection switching is ensured.

The invention is suitable for the technical field of intelligent household appliances, and provides an air conditioner. Wherein the outdoor unit comprises a controller, a compressor and a first expansion valve, the compressor is used for compressing and conveying a refrigerant, and the first expansion valve is used for controlling the conveying flow of the refrigerant in the outdoor unit; the controller is configured to determine a first opening value according to the frequency of the compressor; calculating an opening adjustment value according to the first pressure value; wherein the first pressure value is used for representing the actual pressure on the pipeline processed by the first expansion valve; adjusting the first opening value according to the opening adjustment value to obtain a second opening value; and the opening degree of the first expansion valve is adjusted according to the second opening degree value. In this way, the opening degree control precision of the first expansion valve can be effectively improved, and therefore precise control over the pressure of the air conditioner pipeline is achieved on the premise that the performance of the whole unit is not reduced.

The utility model relates to the technical field of liquid injection valves, in particular to a normally-open type fluid control liquid injection valve, an inner core in a valve core assembly of the normally-open type fluid control liquid injection valve keeps a distance larger than 0.1 mm from a liquid outlet in a natural state, so that the liquid injection valve is kept in a normally-open state, the requirement for continuously introducing air pressure to maintain liquid circulation is lowered, energy consumption and operation cost are reduced, and the service life of the liquid injection valve is prolonged. The backflow preventing assembly comprises a sealing ring and a second abutting block, the sealing ring is driven by liquid backflow pressure to cover a gap between the second abutting block and the liquid inlet pipeline, the backflow phenomenon is reduced, the air pressure driving assembly pushes sealing rubber to deform by adjusting air pressure, then the displacement of the inner core is controlled, and opening adjustment of the liquid outlet pipeline is achieved. And the first spring and the second spring work cooperatively, so that resetting of the inner core and the piston rod is ensured.

A fuel cell system air back pressure valve state detection method and system belong to the fuel cell system field, and comprise: controlling an air back pressure valve opening according to a calibration top dead center, determining whether an actual opening is less than the calibration top dead center, if yes, updating the value of the calibration top dead center to the actual opening, and if not, updating the value of the calibration top dead center to the actual opening; after the value of the calibrated top dead center is updated to be the sum of the actual upper opening and the preset value, a first opening instruction is generated again; the opening degree of the air back pressure valve is controlled according to the calibrated bottom dead center, whether the actual lower opening degree is larger than the calibrated bottom dead center or not is judged, if yes, the value of the calibrated bottom dead center is updated to be the actual lower opening degree, and if not, after the value of the calibrated bottom dead center is updated to be the difference between the actual lower opening degree and preset data, a second opening degree instruction is generated again; and according to the updated calibrated bottom dead center, performing sealing judgment on the air back pressure valve to obtain a sealing result. Accurate upper and lower dead centers of the air back pressure valve can be obtained, so that the opening degree adjusting precision and the sealing performance are improved.

The application belongs to the technical field of household appliances, and specifically discloses an automatic door opening and closing method of a dishwasher and the dishwasher. The automatic door opening and closing method comprises the following steps: when a door opening instruction is received and the upper end of a door assembly is opened by a preset distance, a door opening adjustment action is performed, so that the gravity torque of the gravity of the door assembly on the rotation axis of the door assembly is greater than the support torque applied to the door assembly by a hinge mechanism, and the door opening adjustment action comprises increasing the gravity center height of the door assembly and / or increasing the gravity of the door assembly; and / or when a door closing instruction is received and the door assembly is in an open state, a door closing adjustment action is performed, so that the gravity torque is less than the support torque, and the door closing adjustment action comprises reducing the gravity center height of the door assembly and / or reducing the gravity of the door assembly. The application can realize the automatic door opening and closing action of the dishwasher by adjusting the gravity and / or gravity center height of the door assembly, and improve the automation degree and use experience of the dishwasher.

The invention discloses an opening degree adjusting actuator, a gas compressor and a vehicle, and relates to the technical field of vehicle manufacturing, the opening degree adjusting actuator is suitable for being connected to the gas compressor, the gas compressor is provided with a gas inlet, the opening degree adjusting actuator comprises a driving structure and an adjusting structure, the adjusting structure comprises an adjusting ring and a plurality of adjusting blades, and the driving structure is connected with the adjusting ring; the adjusting blades are arranged to be rotatable; the adjusting ring is arranged to enable the multiple adjusting blades to rotate together and adjust the opening degree of the air inlet through guiding sliding fit of the guiding protruding parts and the guiding sliding grooves during rotation. According to the opening degree adjusting actuator, the adjusting ring can drive the multiple adjusting blades to rotate at the same time so as to change the opening degree of the air inlet, so that the air inlet diameter of the air compressor can be reduced by reducing the opening degree of the air inlet, the trim of the air compressor can be reduced, the surge boundary moves in the small flow direction, and the flow rate of the air compressor is increased. Therefore, the working condition point can fall on the right side of the surge boundary, and the possibility of surge phenomenon is reduced.

This invention provides a method for controlling the opening degree of an expansion valve, a controller, and a heat pump unit. The method for controlling the opening degree of the expansion valve includes the following steps: S102: obtaining the discharge temperature change rate ΔTd of the compressor; S103: setting an adjustment period Δtc according to the discharge temperature change rate ΔTd, wherein the larger the discharge temperature change rate ΔTd, the shorter the adjustment period Δtc; S104: calculating the opening adjustment amount ΔP of the electronic main expansion valve within each adjustment period Δtc; S105: adjusting the opening degree of the electronic main expansion valve according to the calculated adjustment amount within each adjustment period Δtc. Compared with the prior art, this invention sets the adjustment period by the discharge temperature change rate to adjust the opening degree of the expansion valve in a timely manner, thereby effectively preventing the compressor discharge temperature from becoming too high under low ambient temperature conditions and ensuring the normal operation of the heat pump unit.

The utility model relates to the technical field of clamps, in particular to a woodworking clamp. The utility model provides a woodworking clamp which comprises a fixing rod, a screw rod is arranged on the fixing rod, and a clamping seat is arranged at one end of the screw rod. A movable seat capable of sliding is arranged on the fixed rod; and the movable seat is fixed on the fixed rod through a locking screw. The technical problem that in the prior art, the opening adjusting efficiency is low is solved.

The invention relates to the technical field of valve control, in particular to a remote control system and a remote control method for an electrically operated valve. Determining the pressure stabilization demand required for maintaining the pressure stabilization according to the standard pressure deviation distribution condition of the pressure value; according to the change relation between the pressure and the torque and the opening degree of the valve, the opening degree adjustment obstruction representing the adjustment difficulty degree of the opening degree of the valve is determined; an initial torque adjustment coefficient is determined by integrating the pressure stabilization demand quantity, the opening degree adjustment obstruction quantity and the regulation and control lag characteristics represented by historical data; furthermore, the initial torque adjustment coefficient is corrected through the coefficient adjustment weight representing the pipeline fault abnormity, so that the obtained final torque adjustment coefficient is more accurate, more accurate remote control of the electric valve is carried out according to the final torque adjustment coefficient, and the accuracy and safety of remote control of the electric valve are improved.

The invention belongs to the technical field of turbocharging, and discloses an opening degree adjusting assembly for an automobile nozzle ring, which comprises a compression mechanism, and further comprises a turbine assembly fixedly arranged on the compression mechanism; and the variable air guide assembly is arranged in the turbine assembly. In the working process of the engine, the connecting ring drives the first arc-shaped guide vane to be gradually opened, a waste gas circulation channel is expanded, and when the engine is in the high-speed working condition, the connecting ring, the first arc-shaped guide vane and the second arc-shaped guide vane axially move to enter the containing annular groove in the turbine exhaust part; at the moment, the waste gas enters the turbine exhaust part to be in direct contact with the turbine unit, so that the turbine unit and the compressor unit are pushed to work, the phenomena of vibration and local kinetic energy loss caused by vortex and wake of the waste gas due to the influence of guide vanes of the nozzle ring are avoided in the process, and meanwhile, the waste gas guide efficiency of the engine is improved.

The utility model discloses a branch angle opening device, and relates to the technical field of gardening management auxiliary tools, the branch angle opening device comprises a hoop, the outer side wall of the hoop is provided with an annular groove, a plurality of sliding blocks are connected in the annular groove in a sliding mode, and each sliding block and the annular groove can be fastened through a first fastener; a support; the number of the supporting pieces is the same as that of the sliding blocks, the supporting pieces and the sliding blocks are in one-to-one correspondence, one ends of the supporting pieces are hinged to the sliding blocks, V-shaped tooth openings are formed in the other ends of the supporting pieces, the hoop is fixedly arranged on a trunk of a tree in a sleeving mode, the positions of the sliding blocks can be freely adjusted according to the positions of the branches, and therefore the opening angles of the branches at different positions can be met; a V-shaped tooth opening is formed in the end, away from the sliding block, of the supporting piece, the V-shaped tooth opening clamps the branches, angle opening can be carried out on the multiple branches at the same time, meanwhile, the requirement for opening angle adjustment of the branches at different positions can be met, and the branch opening angle adjusting device has the advantages of flexibility and adaptability and is suitable for popularization.

This application relates to the field of vacuum control technology, and provides a control system, control method, and medium for a vacuum butterfly valve. It aims to solve the problems of poor scalability, high module coupling, and easy cascading failures in existing vacuum butterfly valve control systems. The method is applied to the main control module of the vacuum butterfly valve control system, which also includes a drive module and a pressure acquisition module. The method includes: acquiring the current pressure information of a preset cavity through the pressure acquisition module; acquiring the opening adjustment information of the target valve plate in the preset cavity based on the target pressure information and the current pressure information; and controlling the drive module to adjust the opening of the target valve plate according to the target opening information. The method reduces coupling and improves system stability and maintainability by allowing the main control, drive, and acquisition functions to operate independently. Simultaneously, the step-by-step collaborative processing of pressure acquisition, opening calculation, and drive execution improves signal processing efficiency and system response speed.

The invention provides an air door control method and device, a refrigerating device and a storage medium. The air door control method comprises the steps that the working condition state and multiple environment parameters of the refrigerating device are obtained; the working condition state is used for indicating the current working condition of the refrigeration device, and the multiple environment parameters are used for indicating temperature and humidity changes inside and outside the refrigeration device; under the condition that the working condition state indicates that the environment parameters are in the transient operation working condition, normalization processing is conducted on the environment parameters, and multiple pieces of normalized data are obtained; determining a refrigeration score according to the plurality of normalized data and the respective corresponding weight coefficients; the opening degree of the second air door is adjusted according to the refrigeration score; and in the opening degree adjusting process of the second air door, the phase change material of the first air door changes in volume based on the internal environment temperature of the refrigeration device so as to passively control the opening degree of the first air door. The first air door driven by the phase change material and the second air door driven by the algorithm are adopted, the temperature control accuracy of different areas in the refrigeration device is cooperatively improved, the fresh-keeping effect is improved, and cold air waste is reduced.

The invention belongs to the technical field of temperature control, and provides a hearth temperature control method and system, and the method comprises the steps: obtaining the hearth temperature, the header pipe pressure, the opening degree of a gas valve for adjusting the gas flow, and the opening degree of an air valve for adjusting the air flow, carrying out the preprocessing of the obtained data, and extracting the features of the preprocessed data; according to the current features, obtaining candidate opening adjustment amounts of the gas valve and the air valve by using a pre-trained decision network model constructed based on a reinforcement learning method; according to the combustion condition of the hearth, multi-stage safety constraints are introduced, the candidate opening degree adjustment amount is corrected, the final opening degree adjustment amount is obtained, and the opening degree of the corresponding valve is controlled; a double-valve linkage mechanism of the gas valve and the air valve is adopted, the opening adjustment amount of the gas valve and the opening adjustment amount of the air valve are output at the same time in one reinforcement learning decision, fuel supply and the combustion air proportion are automatically matched, and cooperative control is achieved.

The utility model discloses a nozzle with opening degree adjusting structure, including the spray pipe, its output end hingedly arranged with a plurality of annular distribution's first arc plate and second arc plate, each first arc plate all is located corresponding second arc plate far from the spray pipe axle center one side, and it can all rotate and present diffusion shape and spread to the side far from the spray pipe axle center, the diffusion bowl with filter hole is set up in the spray pipe, diffusion bowl is close to the spray pipe output end one side diameter is greater than its far from the spray pipe output end one side, control assembly, it includes the multiple transmission rod of hingedly arranged on each first arc plate and second arc plate and sets up on the spray pipe drive equipment. The utility model discloses can adjust the diffusion range of coal powder according to actual conditions, thus has improved the contact area of coal powder and air, makes the combustion more complete, and simultaneously this diffusion range can change according to the different of first arc plate and second arc plate rotation angle, thereby convenient to use.

The embodiments of the present application relate to the technical field of automatic control of multiple regulating valves in fluorine chemical industry, and provide a method and system for automatic control of multiple regulating valves in fluorine chemical industry to solve the problems of low efficiency and poor safety in the automatic control of multiple regulating valves in fluorine chemical industry in the prior art. Among them, based on the Markov decision process, the optimal operating conditions under the current fluorine chemical production conditions are evaluated and the optimal operating conditions are predicted; based on the process safety limit and the product quality target, an ideal opening adjustment scheme is generated, and the pulse width modulation control instruction is sent to the actuator of the corresponding multiple regulating valves in fluorine chemical industry through the industrial communication bus to obtain the actual valve control strategy of the multiple regulating valves in fluorine chemical industry; the difference between the actual effect and the expected effect is compared to obtain an improved control strategy; the control strategy is continuously optimized according to the experience accumulated by the improved control strategy. The technical solution provided by the embodiments of the present application can improve the efficiency and safety of the automatic control of multiple regulating valves in fluorine chemical industry.

The invention relates to the technical field of negative pressure regulation, and discloses a negative pressure roller air flow regulation device and a control system.The system is characterized in that an acquisition unit preprocesses flow speed data and opening degree data to determine the air flow speed and the valve opening degree, and an analysis unit judges whether to adjust the valve opening degree or not based on the change value of the air flow speed; the processing unit is used for determining an association result of the environment air pressure data and the air flow velocity according to an association rule algorithm, generating air pressure marks according to the association result, determining an opening degree adjusting factor according to the number of the air pressure marks, and adjusting the opening degree of the secondary valve according to the opening degree adjusting factor. The adjusting unit adjusts the opening degree of the target valve based on the opening degree adjusting factor, the air flow is conveyed according to the adjusting result, and by controlling the opening degree of the valve, the shaping and weight losing efficiency and safety are improved.

The invention provides a vehicle air inlet system control method and a vehicle, and relates to the technical field of vehicle control. The working condition information comprises the working state information of the air inlet system, the opening degree information of the grille and the vehicle speed; based on the working condition information, the pollution degree of environmental pollution of the air inlet system is predicted; based on the pollution degree, a target control strategy for the air inlet system is generated, and the air inlet system is controlled to work according to the target control strategy; the target control strategy comprises a grating opening adjustment strategy and an air duct combination strategy. According to the technical scheme, the air inlet quality can be improved, the situation that the air filter element is blocked is avoided, cooperative control over the air duct and the grille based on the pollution degree is achieved, the diversity of control modes is improved, the air conditioner can better adapt to the complex and changeable operation environment, and it is ensured that an engine can work normally.

The present invention relates to an adjustment device for a microplate reader, comprising: an actuation mechanism coupled to a housing of the microplate reader; the adjustable aperture comprises an aperture opening, and the adjustable aperture is driven by the actuating mechanism to move in the axial direction; and a diaphragm opening adjustment member disposed to be movable with respect to a center of the aperture opening to define an adjustable diaphragm opening in the adjustable aperture, in which the diaphragm opening can be adjusted as the adjustable aperture moves toward or away from the microwell plate in an axial direction, and the diaphragm opening adjustment member is disposed to be movable with respect to the center of the aperture opening to define an adjustable diaphragm opening in the adjustable aperture. The diaphragm opening adjustment member moves between a first position and a second position, and an opening size of the adjustable diaphragm opening in the first position is greater than an opening size of the adjustable diaphragm opening in the second position. According to the adjusting device, the size of the opening of the adjustable diaphragm can be changed while the axial position of the adjustable diaphragm is changed. In addition, the invention also relates to a microplate reader comprising such an adjusting device.

The present invention belongs to the field of adjustment mechanisms, and specifically relates to a mold opening adjustment mechanism, comprising a lifting structure, a snap ring structure and a mounting structure, wherein the snap ring structure comprises a locking portion and an adjustment portion, wherein the locking portion is connected to the output end of the lifting structure, and the adjustment portion is connected to the mounting structure. The locking portion on the snap ring structure is locked and fixed with the output end of the lifting structure, the lifting structure is used to be fixed on an external fixed plate or other horizontal fixing member, the lifting structure is connected to an external lifting module through the mounting structure, and the mounting structure is adjustably mounted on the adjustment portion, thereby adjusting the mold opening height, ensuring that the pulp molding equipment meets the mold closing requirements when the maximum stroke of the cylinder is fixed, and ensuring that after the mold is opened, the distance between the upper and lower molds is more than twice the height of a single mold cavity of the mold, and the mounting structure is also provided with a locking component, so as to adjust its position on the adjustment portion when the locking component is not locked.

The invention discloses an air cooling unit temperature control adjusting method and system based on self-adaptive model prediction, and relates to the technical field of industrial cooling control, and the method comprises the steps: collecting air temperatures and water temperatures of a plurality of spatial positions of an air cooling unit, enabling each spatial position to correspond to an independent fan and a cooling water valve, and obtaining a preset temperature threshold value and a space temperature difference threshold value; the air temperature and the water temperature are input into a prediction model, the predicted temperature of each spatial position is obtained, and the predicted temperature difference between the adjacent spatial positions is calculated; identifying a spatial position where the predicted temperature exceeds a temperature threshold or the predicted temperature difference exceeds a spatial temperature difference threshold as a to-be-adjusted position; determining the rotating speed adjusting quantity of a fan corresponding to the to-be-adjusted position and the opening adjusting quantity of a cooling water valve based on the exceeding amplitude; and the rotating speed adjusting quantity and the opening adjusting quantity are output to a fan and a cooling water valve at corresponding spatial positions. According to the invention, excessive adjustment of all actuators is avoided, the space temperature distribution uniformity is improved, the total cooling energy consumption is reduced, and the thermal fatigue of equipment is relieved.

The invention relates to the technical field of high-pressure large-flow hydraulic system control, and discloses an intelligent variable pump control method for an engineering vehicle hydraulic system, which comprises the following steps of: in a single operation cycle, respectively measuring two response times of loading pressure boosting and unloading pressure reduction by utilizing a single pressure switch signal, and calculating the pressure of the hydraulic system on the basis of the inherent asymmetry of the two response times; according to the high-frequency-response electro-hydraulic proportional valve control method, the two time-varying factors, namely the temperature and the load which are originally confused with each other, in a hydraulic system are successfully decoupled, opening adjustment of a key valve can be matched with the real operation environment and task requirements, and the high-frequency-response electro-hydraulic proportional valve control instruction is generated. Response delay or impact caused by state misjudgment is avoided, and adaptability and stability of the control system are improved.

The present invention relates to the field of valve control technology, and specifically to a remote control system and control method for an electric valve. First, a pressure stabilization loss amount characterizing the instability of pipeline pressure is determined based on the fluctuation of pressure values ​​and the correlation between the pressure value and the torque, and then a pressure stabilization demand amount required for maintaining pressure stabilization is determined in combination with the standard pressure deviation distribution of the pressure value; an opening adjustment obstacle amount characterizing the difficulty of adjusting the valve opening is determined according to the changing relationship between pressure and torque and the valve opening; an initial torque adjustment coefficient is determined by comprehensively considering the pressure stabilization demand amount, the opening adjustment obstacle amount and the control hysteresis characteristics shown by historical data; and the initial torque adjustment coefficient is further corrected by adjusting the coefficient weight characterizing the pipeline fault anomaly, so that the final torque adjustment coefficient obtained is more accurate, thereby performing more precise electric valve remote control according to the final torque adjustment coefficient, thereby improving the accuracy and safety of the electric valve remote control.

The invention discloses a control method of an alloy tail gas engine, relates to the field of engine control, and solves the technical problems of controlling an operation mode and realizing automatic control of a special gas source type alloy tail gas engine. The method comprises the steps that firstly, the initial opening degree of an air valve, the initial opening degree of a gas valve, the initial opening degree of a throttle valve and the initial opening degree of a single-cylinder valve are executed to obtain a proper air-fuel ratio to normally start an engine; and secondly, the air-fuel ratio corresponding to the target power value is obtained, and when the air-fuel ratio is not located in the preset target air-fuel ratio range, an opening degree adjusting strategy is triggered to adjust the opening degree of the air valve and the opening degree of the gas valve. The invention further discloses a control device of the alloy tail gas engine. Automatic control over the air-fuel ratio and automatic control over the single-cylinder valve are achieved, and stable operation of the engine is guaranteed.