71 results about "Rail pressure" patented technology

The application discloses a fuel injection control method and device, electronic equipment and storage medium. The fuel injection control method comprises the following steps: after the accelerator pedal is stepped on, determining the engine torque demand according to the current working state of the engine and the stepping amount of the accelerator pedal, and determining the required intake air amount and the required fuel amount of the engine according to the engine torque demand; determining the current throttle opening of the engine according to the required intake air amount, and after the current fuel injection pulse width of the fuel injector is determined according to the required fuel amount, controlling the throttle valve to hit the target position corresponding to the current throttle opening, and controlling the fuel injector to open to the current fuel injection pulse width; acquiring the current fuel injection rail pressure, and determining the fuel injection mass flow of the engine by querying the fuel injection mass flow calculation MAP according to the current fuel injection pulse width and the current fuel injection rail pressure; and inputting the fuel injection mass flow into the engine model to output the current air-fuel ratio. The application realizes real-time adjustment of the fuel injection mass flow.

The invention discloses a hydrostatic guideway, a hydrostatic oil cavity pressure regulating method and a machine tool, the hydrostatic guideway comprises a guideway assembly, a sliding assembly and an oil supply assembly, and the guideway assembly comprises a first guideway and a second guideway; the sliding assembly comprises a sliding seat, a first limiting part and a second limiting part, the first limiting part and the second limiting part are installed on the two opposite sides of the sliding seat respectively in the first direction, sliding grooves are defined by the first limiting part and the second limiting part and the sliding seat, and the first guide rail and the second guide rail are arranged in one-to-one correspondence with the sliding grooves respectively and slidably arranged in the sliding grooves in a sleeved mode; a first static pressure oil cavity is formed between one of the first guide rail and the second guide rail and the side walls of the two opposite sides of the sliding groove in the first direction. In the second direction, second static pressure oil cavities are formed between the first guide rail and the second guide rail and the inner wall faces of the two opposite sides of the sliding groove. The hydrostatic guideway at least can solve the problem that the design scheme of the hydrostatic guideway in the prior art easily causes the reduction and even disappearance of the pressure of the vertical hydrostatic guideway.

The utility model discloses a recovery device for an oil rail pressure testing machine, which comprises a recovery cover, an oil leakage pipe, a filter screen, an electric heating wire and an oil receiving tank, an inlet of the oil leakage pipe is connected to the bottom of the recovery cover; the filter screen is mounted at an inlet of the oil leakage pipe; the electric heating wire is mounted in the filter screen; the engine oil recovery device has the advantages that engine oil is guided to the oil leakage pipe through the inner wall of the recovery cover and then flows into the oil receiving tank, a complete recovery path is formed, cleaning frequency is reduced, and cost is saved.

The invention relates to the technical field of ship fault detection, in particular to a ship dual-fuel electronic injection diesel engine-oriented fault simulation method, which comprises the following steps of: acquiring rail pressure change data of a dual-fuel electronic injection diesel engine when a ship has a fault in navigation; a simulation model of the dual-fuel electronic injection diesel engine is constructed, adjustable fault parameters of all fault types in the simulation model are adjusted for rail pressure simulation, and first rail pressure simulation data are obtained; performing empirical mode decomposition on each piece of rail pressure change data and the first rail pressure simulation data to obtain a first intrinsic mode function component and a second intrinsic mode function component, and respectively calculating the similarity between the multiple pieces of rail pressure change data and the first rail pressure simulation data; and adjusting the first rail pressure simulation data based on the first K rail pressure change data with the highest similarity to obtain second rail pressure simulation data. According to the invention, the simulation accuracy of the simulation signal generated in the prior art is improved.

The invention provides a high-pressure fuel cooperative control system based on multi-gear rail pressure sensing, which is characterized in that a variable frequency motor is in transmission connection with a rotor type high-pressure oil pump through a coupler, an oil outlet of the rotor type high-pressure oil pump is communicated with a pressure-stabilizing common-rail pipe through a common-rail oil inlet pipe, and the rotor type high-pressure oil pump is further communicated with a fuel tank through a first oil return pipe; the pressure-stabilizing common-rail pipe is connected with the oil sprayer through a high-pressure oil pipe A mechanical control valve is arranged at one end of the pressure stabilizing common rail pipe and communicated with the fuel tank through a second oil return pipe. An electromagnetic valve is arranged at the other end of the pressure stabilizing common rail pipe and is communicated with the fuel tank through a third oil return pipe; a pressure storage cavity is formed in the pressure stabilizing common rail pipe, a plurality of independent channels are formed in the pressure storage cavity, each channel is correspondingly provided with a rail pressure sensor, a circulation valve is arranged at an input port of each channel, and the circulation valves and the rail pressure sensors are electrically connected with a controller. Accurate measurement within a large pressure range can be achieved, and the stability of the fuel flow of the fuel injector is guaranteed.

The invention belongs to the technical field of internal combustion engine electronic control, and discloses a Smith-augmented reduced-order ESO common rail pressure control method based on online parameter identification, which comprises the following steps: step 1, data acquisition and preprocessing, step 2, high-pressure common rail system modeling and discretization to obtain a high-pressure common rail system discretization model, and step 3, high-pressure common rail system control. The method comprises the following steps of: 1, constructing an online parameter identification module based on a recursive least square method with a forgetting factor to solve a system pole parameter, a control gain parameter and a constant bias parameter, 3, calculating a time-delay-free virtual prediction rail pressure by a Smith predictor, 4, observing a total disturbance estimated value and a change rate estimated value of a system by an augmented reduced-order expansion state observer, and 5, calculating a total disturbance estimated value and a change rate estimated value of the system by the augmented reduced-order expansion state observer. And combining with the composite anti-interference control law, and controlling the output control quantity to act on a high-pressure oil pump actuator.

The invention provides an engine control method and device, a storage medium and electronic equipment, and the method comprises the steps that operation parameters of an engine are obtained, and the operation parameters comprise the actual load and the actual rotating speed of the engine, the rotating speed synchronization state of the engine and a starter and the rail pressure state of the engine; the working state of a relay of the starter is determined according to the actual load size of the engine, the rotating speed synchronization state and the rail pressure state of the engine, and the throttle valve opening degree of the engine is determined according to the rotating speed synchronization state, the rail pressure state of the engine and the size relation between the actual rotating speed of the engine and the set rotating speed; the relay of the starter is controlled to work according to the working state of the relay of the starter, and the throttle valve is controlled to work so that the actual rotating speed of the engine can be the same as the set rotating speed. According to the method, the actual rotating speed of the engine can be quickly aligned with the set rotating speed by controlling the relay to work and adjusting the opening degree of the engine throttle valve, so that the engine shaking time is shortened.

The engine rail pressure-oxygen sensor combined control method and system of the present application obtains the actual oxygen concentration in the engine exhaust based on the excess air coefficient of gasoline or diesel fuel, and then obtains the excess air coefficient of the methanol-diesel dual fuel engine, thereby obtaining the EGR rate, and combining the pressure inside the high-pressure common rail pipe, realizes the combined control of the engine through the rail pressure and the oxygen sensor. The present application solves the problem of weak anti-interference ability of the traditional control circuit, and accurately calculates the excess air coefficient of the methanol-diesel dual fuel engine, and the calculated excess air coefficient of the methanol-diesel dual fuel engine is closer to the actual working condition, which is the key application direction of the combination of automobile power engineering and embedded control technology, and can improve the engine combustion efficiency and emission performance.

A fuel delivery determination system includes an internal combustion engine having a plurality of cylinders, a plurality of fuel injectors configured to inject fuel for combustion in the cylinders, a fuel rail configured to provide fuel to the plurality of fuel injectors, and a fuel pump configured to pressurize fuel provided to the fuel rail. The system also includes a pressure sensor configured to detect fuel pressure within the fuel rail and a pressure signal configured to receive a pressure signal indicative of the fuel pressure detected by the pressure sensor, the pressure signal including pressure fluctuations caused by the fuel pump and determine fuel injected by one or more of the plurality of fuel injectors a quantity controller, wherein the determining includes removing or reducing at least some of the pressure fluctuations caused by the fuel pump.

A method of controlling fuel injection in an internal combustion engine with fuel injectors (2, Fig 1) comprises the steps of; for a given demand fuel quantity and rail pressure, performing an injecti

The present application relates to the technical field of highway-railway dual-purpose transport equipment, in particular to a highway-railway dual-purpose steel rail double-frequency electric normalizing train, which comprises a vehicle body, a tool container and a mobile steel rail pressure-keeping double-frequency electric normalizing device are carried on the vehicle body; the vehicle body comprises a truck chassis assembly, a load-bearing frame and a hydraulic pump station are connected to the truck chassis assembly, and a set of telescopic hydraulic leg mechanisms are arranged at the front and rear ends of the truck chassis assembly respectively, and a wheel-rail running lifting mechanism is connected to the load-bearing frame; the present device is suitable for post-welding pressure-keeping double-frequency electric normalizing heat treatment operation of steel rail joints in seamless lines and urban rail transit. Furthermore, the device and the tool box are integrated and installed on a highway-railway dual-purpose vehicle, so that the working efficiency is improved, the on-and-off track operation and construction requirements of the device are facilitated, and the hoisting and carrying cost of the device can be greatly saved.

The invention relates to the technical field of hybrid power vehicle engines, in particular to a rail pressure control method and device for a hybrid power vehicle, the vehicle and a storage medium, and the method comprises the steps that the actual working condition of an engine of the hybrid power vehicle is detected; determining a target rail pressure value for controlling the rail pressure to reach the optimal working point according to the actual working condition; and rail pressure control is conducted on an engine of the hybrid vehicle according to the target rail pressure value. Therefore, the problems that in the related technology, due to the fact that the rail pressure target value of the rail pressure control strategy in the initial starting process of the engine is low, rail pressure violent oscillation is generated in the fuel oil recovery process, the rail pressure control effect becomes poor, and the dynamic property and emission of the vehicle are affected are solved.

The application discloses a high-pressure oil pump fault early warning method, system and device, and relates to the technical field of ship diesel engine fault diagnosis. The early warning method comprises the following steps: in response to the high-pressure oil pump being in a steady pressure working condition, sample data of the high-pressure oil pump are acquired; the sample data comprise a front end temperature and rail pressure of the high-pressure oil pump; the sample data are input into a pre-trained early warning model to acquire detection parameters; and in response to the detection parameters being greater than a first threshold value, early warning information is generated. In this way, by monitoring the front end temperature and rail pressure of the high-pressure oil pump and inputting the data into the pre-trained early warning model, online fault early warning of the high-pressure oil pump can be realized, potential fault conditions can be discovered early, fault further deterioration can be avoided, downtime and maintenance costs can be reduced, and the reliability and stability of the diesel engine can be improved. Furthermore, by generating the detection parameters and the first threshold value, when the detection parameters exceed the first threshold value, the early warning information is generated, thereby improving the accuracy of fault detection and reducing false positives and false negatives.

The present application relates to the technical field of engineering measurement, in particular to a fuel consumption testing method and device applied to engineering machinery. The method comprises: acquiring real-time fuel injection pulse width data and real-time fuel rail pressure data; the real-time fuel injection pulse width data and the real-time fuel rail pressure data are collected by a vehicle controller of the engineering machinery at a previous time; determining instantaneous fuel injection quantity data according to the real-time fuel injection pulse width data and the real-time fuel rail pressure data; and calculating total fuel consumption corresponding to a current fuel test period according to the instantaneous fuel injection quantity data. Without modifying the oil circuit, installing a flowmeter or adding a secondary fuel tank, the original data collected by the vehicle controller are used for testing and calculation, which avoids the generation of air bubbles in the oil circuit and the overflow and splashing of fuel, and improves the accuracy of fuel consumption testing of the engineering machinery.

The utility model relates to the technical field of automobile production equipment, in particular to pressure riveting equipment for processing a glass lifter guide rail, which comprises a base, a conveying component, a fixing component and a pressure riveting component, the conveying assembly comprises transmission shafts, transmission rollers, transmission wheels, a transmission belt and a conveying belt, the two transmission shafts are rotationally connected with the base and penetrate through the base, the two transmission rollers are fixedly connected with the transmission shafts and located in the middle of the base, and the two transmission wheels are fixedly connected with the transmission shafts and located on the outer side of the base. The two transmission wheels are connected through the transmission belt, the two transmission rollers are connected through the conveying belt, the fixing assembly and the rivet pressing assembly are connected with the base, and the problem that when the automobile window glass guide rail rivet pressing jig quick-changing device is used, feeding of glass guide rails of different models and sizes is inconvenient, and the rivet pressing efficiency of the glass guide rails is reduced is solved.

A method performed by a processing circuit (e.g., a control unit of or coupled to a vehicle) for estimating an amount of fuel injected by a fuel injector of an internal combustion engine. A processing circuit is coupled to the one or more pressure sensors configured to output a rail pressure of a fuel common rail that supplies fuel to the fuel injector in use. The fuel injector is configured to inject fuel in response to receiving each of one or more drive pulses (e.g., from the processing circuitry), the drive pulses having a predetermined duration. The method includes receiving a plurality of pre-injection rail pressure values and a plurality of post-injection rail pressure values corresponding to rail pressure values before and after a drive pulse, respectively. An upper rail pressure value at the index value at a predetermined point in time within the drive pulse is then determined by extrapolating from the pre-injection rail pressure value. Similarly, a lower rail pressure value at the index value at the predetermined point in time is determined by extrapolating from the post-injection rail pressure value. The upper rail pressure value and the lower rail pressure value are preferably obtained by estimating a pre-injection regression line and a post-injection regression line through a least square method based on the rail pressure values; and the pressure drop is preferably obtained by determining the difference between the upper rail pressure value and the lower rail pressure value at the center of the drive pulse. An amount of fuel injected by the fuel injector is then derived from the determined pressure drop. The invention further discloses a control unit and a vehicle comprising the control unit.

The invention provides a method for determining the carbon deposition amount of an oil injector and a related product. The method for determining the carbon deposition amount of the fuel injector comprises the steps that the rail pressure, the air inlet pressure, the fuel oil temperature in a common rail pipe, the fuel supply advance angle of each cylinder, the fuel supply duration angle of each cylinder, the circulating fuel injection amount, the fuel injection advance angle of each cylinder, the fuel injection duration angle of each cylinder, the total operation time of an engine and the expected rail pressure of the period are obtained; determining a determination flag bit of carbon deposition of the fuel injector; engine cylinder internal pressure, expected engine cylinder injection pressure difference and actual engine cylinder injection pressure difference are obtained through calculation; the actual fuel injection quantity of each cylinder is obtained through calculation; calculating to obtain the carbon deposition amount / rate of each cylinder; after a new engine or a new oil injector is replaced, the initial equivalent carbon deposition amount test working condition is operated, and the previous steps are executed in sequence to obtain the initial equivalent carbon deposition amount / rate of each cylinder; and obtaining the actual carbon deposition amount / rate of each cylinder. Compared with the prior art, the method for determining the carbon deposition amount of the fuel injector and the related product can accurately determine the carbon deposition amount of the fuel injector in real time.

The invention discloses a cold start control method and system for a methanol engine and a vehicle. The cold start control method for the methanol engine comprises the steps that the environment temperature is obtained; gasoline supply unit starting information is output according to the environment temperature; the gasoline supply unit is started according to the gasoline supply unit starting information, and the working accumulated time of the gasoline supply unit is collected; acquiring a gasoline rail pressure value; the working state of the gasoline supply unit is determined according to the gasoline rail pressure value and the working accumulated time; and performing cold start of the methanol engine according to the working state. By determining the working state of the gasoline supply unit, the success rate of cold start is increased.

According to the engine rail pressure-oxygen sensor combined control method and system, the actual oxygen concentration in tail gas of the engine is obtained based on the excess air coefficient of gasoline or diesel fuel, then the excess air coefficient of a methanol and diesel dual-fuel engine is obtained, the EGR rate is obtained accordingly, the internal pressure of a high-pressure common rail pipe of the engine is combined, and the engine rail pressure-oxygen sensor combined control method and system are provided. And combined control over the engine through the rail pressure sensor and the oxygen sensor is achieved. The control circuit solves the problem that a traditional control circuit is poor in anti-interference capacity, the control circuit is matched with the methanol and diesel dual-fuel engine to accurately calculate the excess air coefficient, the calculated excess air coefficient of the methanol and diesel dual-fuel engine is closer to the actual working condition, and the control circuit is suitable for the methanol and diesel dual-fuel engine. The method is a key application direction of combination of automobile power engineering and an embedded control technology, and combustion efficiency and emission performance of an engine can be improved.

The invention relates to the technical field of sensor assembly, and discloses rail pressure sensor filling and sealing equipment which comprises a workbench, a rotary table used for transferring an oil containing shell is arranged on the top face of the workbench, and a shell containing assembly used for taking and placing the oil containing shell is arranged on the top face of the workbench. An oil containing shell is arranged on the top face of the workbench, an oil injection assembly for injecting oil into the oil containing shell is arranged on the top face of the workbench, a station transferring assembly for conducting station transferring on the oil containing shell is arranged on the top face of the workbench, and a defoaming assembly for conducting defoaming on the oil containing shell is arranged on the top face of the workbench. By matching with vacuum suction and vibration assistance, bubbles in oil are effectively removed, the insulation and sensing stability is improved, laser welding is matched with visual detection, high-precision sealing welding is achieved, missing welding or poor welding is avoided, and therefore the long-term reliability and measurement precision of the sensor are guaranteed.

A system for determining fuel delivery includes an internal combustion engine having a plurality of cylinders, a plurality of fuel injectors configured to inject fuel for combustion in the cylinders, a fuel rail configured to provide the fuel to the plurality of fuel injectors, and a fuel pump configured to pressurize the fuel provided to the fuel rail. The system also includes a pressure sensor configured to detect a pressure of the fuel within the fuel rail and a controller configured to receive a pressure signal that indicates the pressure of the fuel detected with the pressure sensor, the pressure signal including pressure fluctuations caused by the fuel pump, and determine a quantity of the fuel injected by one or more fuel injectors of the plurality of fuel injectors, wherein the determination includes removing or reducing at least some of the pressure fluctuations caused by the fuel pump.

This application relates to the field of vehicle technology and discloses a method, device, electronic device, and storage medium for identifying and cleaning engine carbon deposits. The method includes: acquiring a first rail pressure signal from the engine; performing preprocessing on the first rail pressure signal to obtain a second rail pressure signal; extracting dynamic features from the second rail pressure signal to determine the degree of carbon deposit based at least on the dynamic features and a preset network model; and performing corresponding carbon deposit cleaning actions based on the degree of carbon deposit. This application extracts dynamic features from the first rail pressure signal, and can accurately determine the degree of carbon deposit by combining these dynamic features with a preset network model. It then triggers differentiated carbon cleaning strategies (such as pulse high-pressure fuel injection, injector vibration carbon cleaning, and oxygen-rich combustion) based on the degree of carbon deposit, effectively overcoming the shortcomings of existing technologies in early warning, graded diagnosis, intelligent carbon cleaning, and engineering deployment.

The application discloses a diesel engine control method, device, equipment and storage medium. The method comprises the following steps: establishing a maximum nitrogen oxide original emission allowance predictor according to the actual efficiency of a preset selective catalytic reduction device (SCR), the current temperature of the SCR, the current exhaust volume, the expected ammonia nitrogen ratio and the downstream emission limit value, so as to determine the maximum original emission value allowed by the diesel engine; determining the emission volume deviation and the fuel consumption proportion coefficient according to the engine speed, the fuel injection volume and the emission proportion coefficient of the diesel engine; determining the candidate proportion coefficient corresponding to the maximum original emission value, and determining the target fuel injection time and the target rail pressure according to the candidate proportion coefficient, the emission proportion coefficient and the fuel consumption proportion coefficient, as well as the candidate fuel injection time and the candidate rail pressure; and performing adaptive control on the ammonia nitrogen ratio of the diesel engine, and performing fuel injection control on the diesel engine in combination with the target fuel injection time and the target rail pressure. The optimal emission control of the diesel engine can be realized, and the diesel engine is helped to save fuel.

The system determines whether or not to initialize the high-pressure pump correction learning values, and enables automatic initialization if necessary. [Solution] A method for initializing a high-pressure pump correction learning value, comprising: periodically acquiring a rail pressure deviation, which is the difference between the indicated rail pressure and the actual rail pressure; calculating an integral rail pressure deviation value, which is the sum of the periodically acquired rail pressure deviations; temporarily invalidating the high-pressure pump correction learning value stored in an EEPROM provided in the electronic control unit if this integral rail pressure deviation value is outside a predetermined detection range; acquiring a new high-pressure pump correction learning value through learning; and initializing the high-pressure pump correction learning value in the EEPROM if the acquired high-pressure pump correction learning value does not meet predetermined tolerance conditions.

The invention belongs to the field of dual-fuel engine starting, and particularly discloses a control method and system for the process from starting to idling of a dual-fuel engine, and the method comprises the steps that the diesel oil injection quantity, the injection advance angle, the diesel oil rail pressure and the throttle valve required opening degree in the engine starting process are obtained; starting an engine according to the fuel injection quantity and the injection advance angle; judging whether the rotating speed of the engine exceeds an idling takeover value; if the engine is not started again, the diesel injection advance angle is delayed in the starting process, the fuel injection quantity is increased, and the idling set value is triggered to be gradually transited to the final idling target value from the idling takeover value until the rotating speed of the engine exceeds the idling takeover value; if yes, directly triggering the idling set value to gradually transit to the final idling target value from the idling takeover value; and after the idle speed is stable, the injection quantity and the injection advance angle of the diesel oil are gradually transited to the injection quantity and the injection advance angle of micro-injection ignition.

A system (110) and related methods for fuel pressure monitoring are described herein. The system (110) may include an internal combustion engine (120), a plurality of fuel injectors (122), a fuel rail (116), a rail pressure (308) sensor, and a controller. The plurality of fuel injectors (122) may be configured to inject fuel into the internal combustion engine (120). The fuel rail (116) may be configured to provide the fuel to the plurality of fuel injectors (122). The rail pressure sensor (212) may be configured to detect a pressure of the fuel within the fuel rail (116). Further, the controller may be configured to (i) determine a rail pressure based on a signal from the rail pressure (308) sensor; (ii) determine at least one pressure threshold; (iii) calculate a pressure error between the rail pressure (308) and the at least one pressure threshold; and (iv) determine a high pressure condition based on the pressure error.

The invention discloses a fuel oil system fault diagnosis method based on an incremental learning semi-supervised support vector machine, and aims to solve the technical problems that a traditional fault diagnosis method depends on a large amount of marked data, a model cannot be updated in real time, and the adaptability to dynamic working conditions is poor. According to the method, a historical data set is constructed by collecting rail pressure signals of a fuel system, and time-frequency domain features are extracted in combination with ensemble empirical mode decomposition (EEMD); a semi-supervised learning initialization model is adopted, and pseudo-label expansion training data is generated through k-dimensional tree neighborhood kernel estimation; on the basis of low-confidence sample driving incremental learning, online progressive updating of the model is realized; and finally, real-time accurate diagnosis of three states of normal, mild fault and severe fault of the fuel system is realized. The method does not need global retraining, can dynamically adapt to data distribution changes, is high in fault diagnosis accuracy and high in real-time performance, and is suitable for online monitoring and fault early warning of a fuel system in an industrial scene.

The invention discloses a rail pressure control method and system based on CPLD hardware constant current control and electronic equipment, and relates to the technical field of oil pump electromagnetic valve control, and the method comprises the steps that a main control unit issues control parameters and time sequence synchronizing signals to a lower control unit; the lower control unit receives and analyzes the control parameters and feeds back a current detection value and fault state information to the main control unit; generating a driving signal based on the analyzed control parameter, specifically, obtaining processed current feedback data, and obtaining an effective duty ratio; generating a high-end driving signal according to the effective duty ratio in combination with the current modulation frequency, and outputting a low-end driving signal conforming to a preset conduction mode; the high-end driving signal controls the on-off of the first power switch device, and the low-end driving signal controls the on-off of the second power switch device; the effective duty cycle is dynamically adjusted based on a current feedback signal.

This utility model discloses a fuel injector coating control valve, including a control valve sleeve and a sealing ball. The control valve sleeve has a sealing cone surface, a shoulder surface, a transition cone surface, and a chamfered oil outlet. The sealing cone surface is coated with a titanium nitride (TiN) coating. The sealing ball is a ceramic ball. The TiN coating covers the sealing cone surface, the transition cone surface, and the chamfered oil outlet, while the shoulder surface is not coated with TiN. This improves the wear resistance of the control valve sleeve sealing surface, reduces the risk of cavitation corrosion, and extends the service life of the control valve sleeve and fuel injector. The TiN coating reduces the coefficient of friction, decreasing frictional loss with high-speed fluid components. The high bonding strength between the TiN coating and the substrate extends the time before the valve sleeve coating detaches under the impact of high-speed fluid and the high-frequency seating of the valve ball. By using the TiN coating in combination with different substrates, it can meet the application requirements of different rail pressure platform products.

This invention provides a modular machine tool, its assembly process, and its precision testing method. It relates to the field of machine tools, devices, or processes for grinding or polishing. The invention divides the machine tool into six independent modules: a base module, two column modules, a crossbeam module, a slide plate module, a spindle housing module, and a worktable module. This allows for parallel manufacturing and independent transportation of each module, significantly shortening the on-site assembly cycle. Furthermore, high-precision mating surfaces are formed between the modules via the corresponding surfaces of the base and column mounting surfaces, and the corresponding surfaces of the column and crossbeam mounting surfaces, enabling rapid reference transfer between modules. By setting adjustment blocks and corresponding eccentric bolts and side eccentric pins on the sides of the column body and crossbeam, combined with precision adjustment plates, guide rail pressure blocks, guide rail inserts, and slider shims, the straightness and parallelism of the X-axis and Y-axis guide rails, as well as the perpendicularity of the spindle unit axis, can be compensated and quickly restored after final assembly.