428 results about "Cylinder pressure" patented technology

The invention discloses a digital twin intelligent test run system based on a marine medium-speed diesel engine and a monitoring method, relates to the technical field of monitoring, and is used for solving the problems of degeneration identification lag and low emission early warning precision of an oil injector. The system comprises a multi-source heterogeneous data preprocessing module and a running state intelligent diagnosis module. The multi-dimensional data acquisition module is used for acquiring in-cylinder pressure, crankshaft torsional vibration and transient air-fuel ratio signals to construct multi-dimensional data vectors, and the multi-dimensional data acquisition module is used for analyzing combustion fluctuation characteristics based on an attention mechanism LSTM (Long Short Term Memory) network, identifying early deterioration of an oil injector and outputting an oil injection consistency coefficient and a fault type identifier. The method comprises the steps that according to an oil injection consistency coefficient, electromagnetic valve response delay and combustion parameter correlation are tracked, a degradation trend is predicted, and emission early warning is generated; and according to prediction and early warning results, fuel injection compensation parameters are dynamically adjusted in the digital twinborn model, a recursive least square method is adopted to identify combustion parameters and feed the combustion parameters back to an electric control unit, and self-adaptive optimization and closed-loop control in the test run stage are achieved.

The invention relates to the technical field of methanol combustion optimization, in particular to a methanol fuel combustion multi-target collaborative optimization method and a self-adaptive energy consumption regulation and control system, and solves the problem of balance between model precision and real-time optimization efficiency. The method comprises the following steps: constructing a special digital twinborn model, integrating a parameterized chemical reaction dynamic sub-model, a calibration interface dynamically coupled with real-time in-cylinder pressure data and a flow field simulation module, and continuously and dynamically updating; parallel simulation control parameter combination is carried out by using the dynamic model, and multi-target performance including at least two items of heat efficiency, NOx emission and combustion stability is predicted; outputting an optimization parameter set through Pareto frontier analysis of a multi-objective optimization algorithm; and finally, combining the parameter set with the real-time state of the model to select a control parameter to adjust the operation of the equipment, thereby realizing multi-target collaborative optimization and self-adaptive energy consumption regulation and control. According to the method, the system working condition adaptability, the multi-target optimization fineness and the energy consumption regulation and control intelligent level are improved.

The invention discloses a double-screw injection table and belongs to the field of injection equipment, the double-screw injection table comprises a machine body, an upper injection table and a lower injection table, the lower injection table comprises a discharging pipe, a lower screw rod, a sliding plug, a pressure air cylinder and a closing valve, and the discharging pipe and a mold are separated through sealing of the closing valve; then, the rotating lower screw rod is pushed to compress the pressure cylinder under the counter-acting force when extruding the materials, so that the materials can continuously move along with the lower screw rod and continuously enter the lower screw rod, and when next feeding is needed, the closing valve is opened, and the pressure of the pressure cylinder is released, so that the materials are pushed to quickly enter the mold; the effects of quickly feeding and saving the feeding time are achieved, and meanwhile, the pressure of the pressure air cylinder is utilized to enable the materials to be pressed into the mold, and then the pressure maintaining action can still be conducted.

The present application relates to a kind of engine speed determination method and system when idling charging working condition, the method specifically is: S1: establishing the finite element simulation model of vehicle NVH, and carrying out vehicle modal analysis;S2: through the engine speed range under idling charging working condition, obtain the excitation frequency range corresponding to each subsystem and power assembly of vehicle;S3: based on S1 and S2, whether the vehicle modal can avoid the excitation frequency of each subsystem and power assembly of vehicle is judged, if can avoid then end, if cannot then enter S4;S4: obtain the cylinder pressure excitation of engine at different speeds under idling charging working condition, carry out vehicle NVH performance analysis, obtain the vibration speed at steering wheel and the noise sound pressure at the right ear of driver under different speeds;S5: based on steering wheel vibration speed and the noise sound pressure at the right ear of driver, determine the engine speed of idling charging working condition.The present application reaches vehicle NVH performance target requirement, reduces later rectification cost.

The invention discloses an engine multi-vehicle-type adaptive NVH quality optimization method and system, and belongs to the technical field of automobile engine debugge.The method comprises the steps that after an engine is installed on a to-be-adapted vehicle, vehicle working condition data are collected in real time, the vehicle working condition data comprises a vehicle speed, an accelerator opening degree, an engine rotating speed, a gear, a hydraulic torque converter locking state and an engine oil temperature signal; the vehicle working condition data is compared with the working condition of the engine noise sensitive working condition, and whether the engine noise sensitive working condition is entered or not is recognized; when the engine has the noise sensitive working condition, an NVH control strategy embedded in an engine electronic control unit is activated; the NVH control strategy comprises adjustment of an engine ignition angle and oil injection parameters; the engine is controlled according to the ignition angle optimization control instruction and the oil injection parameter optimization instruction; and when the vehicle runs out of the working condition of the noise sensitive working condition of the engine or gear shifting is completed, the conventional combustion control logic is recovered. And the rising rate of the pressure in the cylinder is effectively reduced, so that the structural knocking noise within the range of 150-600Hz is inhibited.

The invention relates to the technical field of engines, and provides a liquid ammonia engine mechanism and a control method and system. The liquid ammonia engine structure comprises a liquid ammonia supply structure which is communicated with the inlet end of a high-pressure ammonia rail through a pipeline; the high-pressure ammonia rail is connected with the cooling structure, and liquid ammonia in the high-pressure ammonia rail exchanges heat with cooling liquid of the cooling structure for cooling; a liquid ammonia temperature sensor is also arranged on the high-pressure ammonia rail; the outlet end of the high-pressure ammonia rail is communicated with the high-pressure liquid ammonia nozzle through a pipeline; the high-pressure liquid ammonia nozzle atomizes high-pressure liquid ammonia into tiny liquid drops and then sprays the tiny liquid drops into the combustion chamber; a cylinder pressure sensor is arranged at the top of the combustion chamber; an oxygen sensor is arranged on the exhaust pipeline; the system further comprises an ECU module. The ECU module carries out dynamic decision making through a preset sub-working-condition control strategy on the basis of the operation working condition of an engine and obtained monitoring data. The problem that the actual injection amount is reduced due to the liquid-gas entrainment phenomenon in the liquid ammonia conveying process is solved.

The invention discloses a heavy-load AGV hydraulic suspension attitude keeping method, and belongs to the technical field of heavy-load AGV control, and the method comprises the steps: obtaining a vehicle-road surface joint state vector through sliding mode-extended Kalman filtering, obtaining a vehicle linearization dynamic matrix and a covariance thereof through a gating circulation unit network, and obtaining a vehicle-road surface joint state vector; and on the basis, a model prediction controller of a variable prediction time domain is used for outputting a target cylinder displacement instruction and a pressure instruction, and the instructions are corrected in real time so as to realize dynamic level control of the vehicle platform. According to the method, a sensing, decision-making and execution closed-loop self-adaptive link is formed through a four-source coupled pavement and centroid estimation link, a double-layer decision-making architecture composed of a gating circulation network and model prediction control, and a hydraulic network tension compensation mechanism based on a graph convolution network; and road surface prior, load distribution and multi-cylinder pressure instructions can be synchronously updated in a millisecond-level time scale, so that the dynamic levelness and the energy utilization rate are remarkably improved.

The invention discloses a marine high-pressure common rail diesel engine MPC combustion control method based on a physical informatization neural network, and belongs to the field of marine high-pressure common rail diesel engine control. The problems that physical consistency of a model and a real machine is ignored and the generalization ability of the model is poor due to the fact that only data driving is relied on are solved. The method comprises the following steps: keeping a combustion midpoint unchanged, and acquiring in-cylinder pressures, in-cylinder maximum pressure rise rates, indication heat efficiency and emission data of different pilot injection fuel ratios and pilot main injection positive time intervals; calculating the average indicated pressure circulation change of the diesel engine, screening data and calculating the accumulated heat release amount and the combustion midpoint; obtaining an influence rule of related characterization parameters of combustion in a diesel engine cylinder, and determining a crank angle corresponding to pilot injection timing, a pilot injection fuel ratio, a pilot main injection interval boundary and an upper limit of a maximum pressure rise rate of cylinder pressure; a diesel engine in-cylinder combustion prediction output model and an MPC controller are constructed; and updating control parameters and combustion state data to realize closed-loop control. The method is used in energy-saving and emission-reducing fields.

The invention relates to a cooperative control method and system for lean-burn emission of a marine low-zero carbon fuel engine. The method comprises the steps that real-time in-cylinder pressure and temperature data are collected, and an in-cylinder pressure curve and an in-cylinder temperature curve are obtained through time sequence alignment, filtering denoising and interpolation fitting processing; extracting time sequence data based on the curve, calculating average effective pressure and peak temperature in a cylinder to determine a current load interval, and marking a risk tag sequence; calculating the generation rate of the nitrogen oxides and the particulate matters by matching with reaction condition parameters, and extracting reverse variation characteristics to obtain strong mutual exclusion correlation of the nitrogen oxides and the particulate matters; and based on the associated starting model, predicting and controlling the output oil injection quantity and the air inflow adjusting quantity, calculating the transient time sequence lag quantity through a dynamic lag model, and after superposition, calibrating through a combustion phase matching algorithm to generate an oil injection timing and air inlet valve opening control instruction after transient adjustment. The method is adaptive to the combustion characteristics of low-zero-carbon fuel, emission contradictions are accurately captured, transient emission peak values are avoided, and multi-pollutant collaborative control is achieved.

The invention relates to the technical field of engine control and state monitoring, and discloses a diesel engine in-cylinder pressure multi-source fusion estimation method based on adaptive Kalman filtering, which comprises the following steps: acquiring working condition parameters and torque signals of a diesel engine; based on the collected working condition parameters, model prediction cylinder pressure is obtained; based on the collected torque signals, single-cylinder contribution is extracted, and torque reverse thrust cylinder pressure is obtained through reverse thrust; according to the real-time information entropy change of the model prediction cylinder pressure and the torque reverse thrust cylinder pressure, dynamically distributing a fusion weight, and generating a fusion observed quantity; forming an extended characteristic quantity based on the characteristic that the fusion observed quantity changes along with the crank angle; establishing a state transition equation and an observation equation; and outputting an in-cylinder state prediction and estimation result after fusion optimization. According to the method, the in-cylinder pressure multi-source fusion estimation method based on adaptive Kalman filtering is adopted, fusion weights of different data sources can be dynamically adjusted in real time, and the technical effect of considering steady-state accuracy and transient response speed is achieved.

The invention relates to the technical field of automatic control, in particular to a vehicle docking and automatic leveling system for a loading site. Comprising a loading platform, a butt joint platform, a linear guide rail, a sliding carrying platform, a servo motor, a platform side two-dimensional linear scanning laser sensor, a four-corner hydraulic cylinder assembly, a cross balance valve assembly, a servo valve, a cylinder pressure sensor, a magnetostrictive displacement sensor and a controller. The linear guide rail is arranged on a top cross beam of the loading platform, the sliding carrying platform is arranged on the linear guide rail and is driven by the servo motor to reciprocate, the platform-side two-dimensional linear scanning laser sensor is fixed on the sliding carrying platform, and a laser emitting plane is perpendicular to the longitudinal axis of the loading platform; the four-corner hydraulic cylinder assembly is arranged at the bottom of the butt-joint platform and supports the butt-joint platform, and the cross balance valve assembly is communicated with rodless cavities of the two opposite-corner hydraulic cylinders. According to the invention, the space pose information of the opening at the rear end of the compartment can be stably obtained under the condition that the vehicle parking attitude has transverse deviation, pitching or transverse rolling.

The invention discloses a three-dimensional pressure field measurement method for spray flame measurement in an optical engine, and belongs to the technical field of optical imaging applied to spray flame measurement in the optical engine. The implementation method comprises the following steps of: establishing a Cartesian coordinate system in the transparent cylinder of the optical engine, and applying a tomographic particle image velocity measurement method to the diagnosis of a spray flow field or a flame combustion process in the transparent cylinder of the optical engine; and calculating first-order derivatives of the three-dimensional velocity field distribution in time and three space directions. And substituting the first-order derivatives of time and space into a Navier Stokes equation to calculate and obtain pressure gradient field distribution in three space directions. And calculating the three-dimensional pressure relative distribution of the whole space to be measured relative to the pressure reference point through a direct integration method. A real pressure value at the pressure reference point is determined through a cylinder pressure sensor in the optical engine, and then three-dimensional pressure field distribution of the whole space to be measured is obtained.

The invention discloses an intelligent electrostatic monitoring system and method based on state self-sensing, and belongs to the technical field of industrial safety monitoring, and the system comprises a pipeline, a Faraday cup sampling mechanism driven by a cylinder, a multi-sensor module and an intelligent control unit. The core of the method is that air pressure and displacement signals of an air cylinder are collected in real time and compared with a pre-stored reference model, the motion state of the air cylinder is intelligently diagnosed, a hierarchical fault-tolerant control strategy is triggered according to a diagnosis result, and self-recovery or shutdown protection is achieved. And the sampling frequency can be adaptively adjusted. The Faraday cup adopts a double-layer shielding structure with height difference and a connector with a round top and a square bottom so as to resist interference; and a top-speed opening and closing mechanism is combined with a multiple flexible anti-blocking sealing structure, so that the problems of mechanical blocking and sealing are effectively solved. According to the invention, the conversion from passive maintenance to predictive maintenance is realized, and the reliability, availability and intelligent level of monitoring equipment in a severe industrial environment are greatly improved.

This application belongs to the technical field of ultra-high pressure compressors, specifically relating to a monitoring method and system for ultra-high pressure compressors. The cylinder pressure and working volume of the cylinder mechanism of an ultra-high pressure compressor can reflect the operating state of the compressor. The cylinder mechanism of the ultra-high pressure compressor includes a cylinder body forming a piston chamber, a middle body and a cylinder head respectively disposed at both ends of the cylinder body, a tie rod bolt connecting the middle body and the cylinder head, and a piston component that slides against the wall of the piston chamber. The cylinder pressure refers to the pressure between the piston component and the cylinder head, and the resulting pressure can cause the cylinder head and middle body to separate from the cylinder body. The tie rod bolt is used to balance the pressure; therefore, the axial strain of the tie rod bolt can reflect the cylinder pressure. In this application, the cylinder pressure is indirectly obtained by directly measuring the axial strain of the tie rod bolt, thereby avoiding drilling holes in the cylinder body to install sensors for direct measurement of the cylinder pressure, thus avoiding damage to the cylinder mechanism and reducing the safety risks associated with measuring the cylinder pressure.

The application provides a train emergency braking system performance degradation trend detection method, device and medium, the method collects brake cylinder pressure in each emergency braking process in real time, forms brake cylinder pressure curves of each emergency braking, extracts characteristic values of brake cylinder pressure curves of each emergency braking, calculates degradation factors of each emergency braking according to predetermined characteristic reference values and characteristic values of each emergency braking, and detects train emergency braking system performance degradation trend according to the degradation factors of each emergency braking. The method of the application is based on brake cylinder pressure in each emergency braking process, calculates degradation factors of each emergency braking, detects train emergency braking system performance degradation trend according to the degradation factors of each emergency braking, improves the accuracy of degradation detection, realizes continuous monitoring of braking system performance, and improves the safety of train travel and maintenance efficiency.

In one instance, an engine cylinder head includes: an intake passage; an exhaust passage; a coolant channel having a first outer surface including a first portion and a second portion, the first portion being shared with the intake passage and the second portion being shared with the exhaust passage; a lubricant channel; and an in-cylinder pressure sensor (ICPS) bore at least partially defined by at least one wall having at least one second outer surface including a third portion and a fourth portion, the third portion being shared with the coolant channel and the fourth portion being shared with the lubricant channel.

The invention provides a posture adjusting method, system and equipment for a cold regenerator and a medium, and belongs to the technical field of cold regenerator control, the method comprises the following steps: descending four supporting legs of the cold regenerator before construction, enabling the whole machine to be horizontal, enabling a milling hub to be flush with the ground, and recording the heights of the four supporting legs as zero point heights; lowering the milling hub to a target cutting depth, and collecting initial values of a left-right inclination angle, a front-back inclination angle, four support leg oil cylinder pressures and an engine load rate corresponding to the zero point height; in the construction process, the real-time values of the left-right inclination angle, the front-back inclination angle, the pressure of the four supporting leg oil cylinders and the engine load rate are collected in real time; the change of the real-time value relative to the initial value is compared, the state of the corresponding supporting leg is judged to be pressed to the obstacle or the pit, the corresponding supporting leg ascends or descends till the collected real-time value recovers to the initial value, and automatic adjustment of the posture of the cold regenerator is completed. The machine body can be automatically kept horizontal, it is guaranteed that the cutting depth is stable, and construction precision and efficiency are improved.

The application discloses an ammonia-hydrogen internal combustion engine knock suppression system and a knock suppression method, and belongs to the technical field of internal combustion engine combustion control. The suppression system comprises an ammonia gas supply unit, a hydrogen gas supply unit, a cylinder pressure sensor, a pressure sensor and an electronic control unit. The ammonia gas supply unit realizes ammonia gas supply in a cylinder. The hydrogen gas supply unit realizes hydrogen gas supply in the cylinder. The cylinder pressure sensor is used for monitoring the pressure in the cylinder in real time and calculating CA50. The pressure sensor is used for monitoring the knock intensity of the cylinder. The electronic control unit is electrically connected with the ammonia gas supply unit, the hydrogen gas supply unit, the cylinder pressure sensor and the pressure sensor respectively, is used for receiving sensor signals, calculating ammonia energy (AER) and knock intensity (KI), controlling the ignition time and dynamically adjusting the ammonia mixing ratio, realizing the collaborative optimization of knock suppression and thermal efficiency, and achieving the win-win effect of "knock suppression" and "efficiency increase".

The utility model provides a combined propelling hydraulic system for a chambering type vertical shaft heading machine. The combined propelling hydraulic system comprises a motor, a propelling pump, a control oil pump, a hydraulic oil tank, a propelling control valve group, an oil cylinder pressure maintaining valve group and a propelling oil cylinder, one end of the thrust cylinder is connected with the vertical shaft heading machine tight supporting platform, and the other end is connected with the main driver and the cutterhead; the oil cylinder pressure maintaining valve group is integrated on the propulsion oil cylinder and is connected with the propulsion control valve group through a steel pipe; the propulsion control valve group comprises a proportional speed regulating valve and a proportional overflow valve and is used for realizing a speed control mode and a pressure control mode of the propulsion oil cylinder; the oil cylinder pressure maintaining valve set comprises an external control one-way valve and a pilot-operated type overflow valve and is used for maintaining the pressure maintaining state of an oil cylinder during step changing, cutter head retreating and pipeline accidental damage. A rod cavity of the thrust cylinder is provided with a back pressure system, and back pressure is adjusted through an overflow valve to reduce vibration impact of equipment. The utility model can effectively improve the unfavorable geology handling capacity of equipment, reduce high-pressure impact, and enhance the safety and stability of the equipment.

The invention discloses an engine combustion control method, device and equipment, a storage medium and a vehicle, and belongs to the technical field of vehicles. The method comprises the following steps: at least collecting cylinder pressure data and ionic current data; determining a combustion center-of-gravity position value based on the cylinder pressure data; determining a center-of-gravity offset based on the ion current data; determining a fusion weight coefficient based on the cylinder pressure data and the ion current data; determining a standard center-of-gravity position value at least based on the combustion center-of-gravity position value, the center-of-gravity offset and the fusion weight coefficient; and controlling the engine combustion state at least based on the standard center-of-gravity position value and a preset target value. The combustion center-of-gravity position and the center-of-gravity offset are determined based on the collected cylinder pressure data and the ion current data, and then the current standard center-of-gravity position is accurately determined, so that the combustion center-of-gravity position of the engine is accurately adjusted subsequently, and the combustion efficiency of the engine is guaranteed.

The invention provides a method for generating performance degradation data of a train air braking system. The method comprises the following steps: on the basis of a brake system of a preset model, analyzing three stages of pressure rise, maximum pressure and pressure stability of pressure change of a brake cylinder, and extracting a plurality of typical fault modes; based on an extended random process model with non-monotonicity and independent incremental property, three stages of pressure change of a brake cylinder and multiple typical fault modes are combined, and linear, nonlinear or stepped performance degradation process modeling of the train air brake system is carried out; overlapping normal distribution random noise on a performance degradation track generated by modeling, simulating a control precision error of an actual braking system, and optimizing a performance degradation process model of the train air braking system; and utilizing the train air braking system performance degradation process model to generate train air braking system performance degradation data in batches.

The application is suitable for the technical field of hydraulic machines, and provides a volume dynamic balancing system and a control method of a free forging hydraulic machine.The volume dynamic balancing system comprises: an upper liquid filling tank installed on the top of a free forging press main machine; a lower power tank installed on a ground foundation; the free forging press main machine installed on a load-bearing foundation in a pit; an oil supplement pump group installed on the ground foundation; a main cylinder pressure relief valve group installed on the top of the free forging press main machine; and a side cylinder pressure relief valve group installed on the top of the free forging press main machine.The application has the advantages of wide application range, low total equipment height, high stability, high safety, simple device structure and strong anti-pollution ability.

The application discloses a double-screw injection platform and belongs to the field of injection equipment, which comprises a machine body, an upper injection platform and a lower injection platform. The lower injection platform comprises a discharge pipe, a lower screw rod, a sliding plug, a pressure cylinder and a closing valve. The sealing of the closing valve separates the discharge pipe from a mold. When the lower screw rod is rotating and extruding materials, the lower screw rod is pushed and compressed by the reaction force, so that the materials can continuously move along with the lower screw rod and enter the lower screw rod. When the next feeding is needed, the closing valve is opened, and the pressure of the pressure cylinder is released, so that the materials are pushed into the mold quickly, the feeding time is saved, and the pressure maintaining action can be performed after the materials are pressed into the mold by the pressure of the pressure cylinder.

According to the analog quantity expansion acquisition plug-in suitable for the urban rail transit engineering vehicle operation protection system, a main air cylinder pressure sensor, a balance air cylinder I pressure sensor and a balance air cylinder II pressure sensor are respectively installed at corresponding positions of a main air cylinder, a balance air cylinder I and a balance air cylinder II, and the output mode is analog signal output. The pressure sensor is used for collecting pressure signals, the collected pressure signals are converted into electric signals, the electric signals are transmitted to the analog quantity expansion plug-in unit through a cable, the analog quantity expansion plug-in unit samples and processes the three paths of pressure signals, and collected pressure information is sent to the main control plug-in unit through a CAN channel. The main control plug-in processes and converts the received pressure information and then sends the converted pressure information to the screen display for display, on the basis that only two paths of pressure signals are supported to be collected at present, three paths of pressure signals are expanded and added, a driver can better control the engineering vehicle in the operation process, and the usability of the urban rail transit engineering vehicle operation protection system is improved.

Single-acting actuator (1) comprising a cylinder (2), a pressure chamber (7), a spring-return piston (3), and an inner chamber region (8) in which a rack (13) protrudes from the underside of the piston (3), and the rack (13) interacts with a rotatable pinion (14) arranged perpendicular to the rack (13) in the inner chamber region (8), wherein the pitch line of the rack (13) is substantially aligned with the center of the piston (3), wherein one or more return springs (4) are arranged within the inner chamber region (8), and wherein the one or more return springs (4) are arranged on the same side of the piston (3) as the rack (13) and the pinion (14).

A rotor engine comprehensive bench test system and test method belong to the technical field of engine test. The system contains rotor engine, AC power dynamometer, main control unit and other groups of modules. The dynamometer can realize forward and reverse reversible rotation of the engine. The main control unit is provided with forward and reverse switching and three-stage alarm module. Each component is connected and communicated. Sensors, acquisition modules, analyzers and the main control unit are cooperatively networked. The test method sequentially completes bench building, system inspection, pre-starting verification, lubrication establishment, engine starting, top dead center searching, mechanical loss test, warming, full-range boundary monitoring, hot-state running-in, ECU online calibration and data evaluation. The combustion analyzer can calculate cylinder pressure parameters. ECU modified parameters take effect immediately. Data analysis covers power and economic indicators. The present invention solves the problem that existing benches cannot adapt to rotor engine tests, builds a safe and efficient comprehensive test platform and provides technical support for rotor engine research and development.

This application relates to a hydraulic brake cylinder pressure control system and its control method. The control system includes a pressure generation module and a pressure control module. The pressure generation module includes a check valve, an external accumulator, and an accumulator sensor. The check valve is connected to an oil tank. The pressure control module includes a proportional solenoid valve connected to the external accumulator and the brake cylinder; a pressure-holding solenoid valve located at the overflow port of the proportional solenoid valve, which is connected to the oil tank via the pressure-holding solenoid valve; a brake cylinder sensor collecting and outputting the brake cylinder pressure; and a brake cylinder pressure switch electrically connected to the brake cylinder sensor. During the relief condition, the proportional solenoid valve is de-energized and the pressure-holding solenoid valve is energized. During coasting or braking conditions, the proportional solenoid valve is energized, and the pressure-holding solenoid valve is de-energized after a delay. This application reduces the usage rate of the proportional solenoid valve and improves system reliability through the coordinated control of the proportional solenoid valve and the pressure-holding solenoid valve.

The invention relates to a steel belt deviation adjusting method and system for a continuous press, and the method comprises the following steps: S1, dividing an oil cylinder array of the continuous press into a disturbance area and a compensation area which are arranged along the running direction of a steel belt, and obtaining the oil cylinder acting force difference of each column of oil cylinders in the oil cylinder array in the disturbance area in real time; s2, when the acting force difference of the oil cylinder in the disturbance area exceeds a deviation adjusting threshold value, determining a compensation oil cylinder and calculating the compensation acting force difference; s3, after it is detected that the acting force difference of the oil cylinder in the disturbance area exceeds a deviation adjusting threshold value and preset time passes, a compensation oil cylinder is dispatched to conduct oil cylinder pressure adjustment according to the compensation acting force difference and the compensation coefficient; s4, the middle displacement offset of the steel belt is obtained in real time; and S5, adjusting the value of the compensation coefficient according to the middle displacement offset of the steel belt, and returning to the step S2. The deviation of the steel belt is pre-judged according to the change of the oil cylinder acting force applied by the oil cylinder, the deviation adjusting action is performed aiming at the deviation source of the steel belt, the deviation of the steel belt is accurately controlled, and the deviation adjusting efficiency and accuracy of the steel belt can be effectively improved.

The invention discloses a commercial vehicle air compressor energy consumption determination method and device, and the method comprises the steps: exporting test data generated by a commercial vehicle in a road test process, and the test data at least comprise brake cylinder pressure data; according to the pressure data of the brake cylinder at the current moment and the pressure data of the brake cylinder at the next moment, the unloading starting time and the unloading ending time of the air compressor are determined; after unloading of the air compressor is finished, operation data of the air compressor are obtained, and the operation data comprise unloading data and working data; when the air compressor works, a current state signal of the commercial vehicle is obtained; determining the working state of the commercial vehicle according to the current state signal; and when the commercial vehicle works, the energy consumption of the air compressor is determined according to the rotating speed signal during operation of the air compressor. By utilizing the method, the determination of the unloading data of the air compressor, the determination of the working state of the whole vehicle when the air compressor works and the determination of the energy consumption of the air compressor are realized, and the energy-saving property and the safety of the commercial vehicle are ensured.

The invention relates to an integrated two-stage empty and load adjusting device for a railway wagon and a control method thereof, and aims to meet the requirements that an existing stepless adjusting device is complex in pipeline and has multiple leakage points, and a heavy load special line only needs two-stage empty and load adjustment, a proportional valve assembly and a sensing valve assembly are integrated into a whole. Installation arrangement is simplified, and pipeline joints and potential leakage risks are reduced. A proportional valve assembly of the device adjusts the compressed air flow from a brake control valve to a brake cylinder, a sensing valve assembly controls connection and disconnection of the brake cylinder and a pressure reduction air cylinder according to the vehicle load state, and a pressure adjusting assembly controls exhaust of a proportional piston back cavity through the pressure of the pressure reduction air cylinder. The sensing valve assembly opens a brake cylinder and pressure reduction air cylinder passage when the vehicle is empty and closes when the vehicle is loaded, precise two-stage pressure adjustment of empty and loaded working conditions is achieved, and meanwhile structural light weight, arrangement convenience and system reliability are taken into consideration.