194 results about "Rail pressure" patented technology

The invention relates to the technical field of diesel engine power control, in particular to a control method for reducing plateau power loss of a supercharged diesel engine through EGR. The working condition point of current operation is obtained through the engine rotating speed sensor and the accelerator position sensor, the electronic control unit corrects the main injection advance angle and the rail pressure according to the current altitude, and then the opening degree of the EGR valve is calculated and controlled according to the air amount demand value and the actual air inflow measured by the PFM air flow meter. When the altitude simulation test bench performs external characteristic tests under various altitudes, the main injection advance angle, the rail pressure and the air quantity demand quantity of the diesel engine are continuously debugged by combining the rotating speed of a diesel engine supercharger, the vortex front exhaust temperature and the smoke intensity value tested by the bench, and finally the EGR opening degree value and the external characteristic oil quantity value under the altitude condition are determined. And obtaining the maximum plateau power result under the altitude condition.

Disclosed is n engine system 2 for a vehicle, the engine system comprising a fuel injector 26 for delivering fuel directly into an associated engine cylinder 12, the associated cylinder having a cylin

Disclosed is an engine system for a vehicle, comprising a rail volume 28 for receiving gaseous fuel; a shut off valve 38 for controlling the supply of fuel to the rail volume ; an injector assembly in

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 relates to the field of oil pumps, in particular to a centralized high-pressure common rail system. The common rail system comprises a PVC valve, a right cross rail connecting pipe, a left cross rail connecting pipe, a right high-pressure common rail, a left high-pressure common rail, a high-pressure oil pipe A, a high-pressure oil pipe B, a high-pressure oil pipe C, a safety valve and a rail pressure sensor, one side of the PVC valve is communicated with the right high-pressure common rail through the right cross rail connecting pipe, and the other side of the PVC valve is communicated with the left high-pressure common rail through the left cross rail connecting pipe. And a rail pressure sensor is mounted at the end of the right high-pressure common rail. The left high-pressure common rail and the right high-pressure common rail are connected at the rear end of the diesel engine, and it is guaranteed that oil pressure in oil cavities of the left high-pressure common rail and the right high-pressure common rail tends to be consistent; the high-pressure common rail is of a double-layer pipe structure, and the high-pressure oil pipe and the high-pressure common rail are connected and sealed through a ball head. The high-pressure common rail inner pipe is an integral steel pipe, and the high-pressure common rail outer pipe is a sectional steel pipe, so that the high-pressure common rail has better safety and leakproofness.

The utility model relates to the field of oil pumps, in particular to a centralized high-pressure common rail system. The common rail system comprises a PVC valve, a right cross rail connecting pipe, a left cross rail connecting pipe, a right high-pressure common rail, a left high-pressure common rail, a high-pressure oil pipe A, a high-pressure oil pipe B, a high-pressure oil pipe C, a safety valve and a rail pressure sensor, one side of the PVC valve is communicated with the right high-pressure common rail through the right cross rail connecting pipe, and the other side of the PVC valve is communicated with the left high-pressure common rail through the left cross rail connecting pipe. And a rail pressure sensor is mounted at the end of the right high-pressure common rail. The left high-pressure common rail and the right high-pressure common rail are connected at the rear end of the diesel engine through the left high-pressure common rail and the right high-pressure common rail, so that oil pressure in oil cavities of the left high-pressure common rail and the right high-pressure common rail tends to be consistent; the high-pressure common rail is of a double-layer pipe structure, and the high-pressure oil pipe and the high-pressure common rail are connected and sealed through a ball head. The high-pressure common rail inner pipe is an integral steel pipe, and the high-pressure common rail outer pipe is a sectional steel pipe, so that the high-pressure common rail has better safety and leakproofness.

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 invention provides a vehicle control method and device, electronic equipment and a vehicle, and is applied to the technical field of vehicle intelligent control. The method comprises the steps that in response to a received starting instruction of an engine, the rail pressure of a fuel injection metering valve, fuel supply data and the rotating speed of the engine are obtained; whether a fuel injection metering valve is blocked or not is determined according to the rail pressure and the fuel supply data; executing a self-cleaning strategy of the oil injection metering valve in response to determining that the oil injection metering valve is stuck and the rotating speed of the engine is smaller than or equal to the preset rotating speed; according to the self-cleaning strategy of the oil injection metering valve, the working frequency of a valve element of the oil injection metering valve is reduced, and the movement amplitude of the valve element is increased. The clamping stagnation risk caused by fuel oil impurities is reduced, meanwhile, abrasion caused by long-time low-frequency long-stroke work of the oil injection metering valve is effectively avoided, and the service life of the oil injection metering valve is prolonged.

The utility model discloses a rail damage detection experiment system based on a vehicle-mounted acoustic emission technology, and belongs to the technical field of vehicle-mounted acoustic emission detection experiments. And the track load condition of the train passing through the track can be simulated. Comprising a steel rail base, an operation support and a rolling wheel set. The steel rail base provides necessary mechanical support for the whole system, the steel rail on the steel rail base can prefabricate various damages, richer experimental data are provided, the running support is matched with the steel rail base to guide the rolling wheels to roll on the steel rail, and the pressure between wheel rails is adjusted through an external hydraulic machine, so that the steel rail base can be used for prefabricating various damages. A wheel rail state during real train operation is simulated, a rolling wheel set rolls on a steel rail to generate an acoustic emission phenomenon, an acoustic emission signal acquired by an acoustic emission sensor is transmitted to an acoustic emission acquisition system through a conductive slip ring, a rolling state of a roller is recorded through a rotary encoder, and necessary priori knowledge is provided for a vehicle-mounted acoustic emission experiment. And stable and reliable experimental research of the vehicle-mounted acoustic emission technology in a laboratory environment is realized.

The invention discloses a gas engine cold start difficulty diagnosis method, system and device and a readable storage medium, and relates to the field of cold start fault detection, and the method specifically comprises the steps: determining an initial idle speed segment based on a real-time vehicle speed, a real-time engine rotation speed, a neutral gear signal and a clutch signal when the lowest environment temperature is detected to be smaller than a preset environment temperature threshold value; the initial idling segment is a working state when the vehicle is static and an engine is in an idling mode; in the initial idle speed segment, based on the maximum value of the engine rotating speed, the real-time engine rotating speed, the real-time gas rail pressure, the real-time gas rail temperature, the engine water temperature at the starting point of the initial idle speed segment, the real-time accelerator opening degree and the fault code, the cold start difficulty result of the gas engine is determined; the fault code is a corresponding fault code when the pressure of the intake manifold is smaller than a preset pressure threshold value of the intake manifold. According to the invention, specific faults of cold start difficulty can be identified efficiently and accurately.

The invention relates to a hydrogen internal combustion engine rail pressure fluctuation control method and device, a storage medium and an injection system. The control method comprises the steps that the current working condition is obtained, and the preset rail pressure and the preset fuel injection quantity are obtained according to the working condition; acquiring current rail pressure data and cylinder pressure data; according to the rail pressure data and the cylinder pressure data, the current injection flow is calculated; according to the injection flow and the current preset oil injection quantity, the current cylinder fluctuation coefficient is calculated; and when the cylinder fluctuation coefficient exceeds a preset threshold value, the current rail pressure adjustment amount is calculated according to the current preset rail pressure, and the rail pressure of all the air cylinders is adjusted according to the rail pressure adjustment amount. Compared with the prior art, the method has the advantages that injection fluctuation and multi-cylinder interference are reduced, and the combustion stability, efficiency and emission performance of the hydrogen internal combustion engine are improved.

The embodiment of the invention relates to the field of vehicle control, in particular to an engine rail pressure control method, device and equipment and a storage medium, and aims at achieving accurate pre-control over the engine rail pressure. The method comprises the following steps: mounting an engine on a test bench; the engine is tested and calibrated through the test bench, and a slope three-dimensional diagram and an intercept diagram of the engine under each set of rotating speed and rail pressure are obtained; and according to the slope three-dimensional diagram and the intercept diagram, the corresponding relation between the relative oil injection quantity and the oil pumping continuous angle under each set of rotating speed and rail pressure is determined so as to control normal operation of the engine.

A process of operating an internal combustion engine system includes operating a fuel injector in fluid communication with a fuel rail to inject multiple pulses of fuel per a combustion stroke, determining a measured dynamic fuel pressure indicative of variation in fuel pressure of the rail during one of the multiple pulses, determining an adaptation of a modeled dynamic rail pressure to the measured dynamic fuel pressure, determining a modified injection control parameter in response to the adaptation, and at least one of controlling and diagnosing the internal combustion engine system in response to the modified injection control parameter.

The invention discloses a pulse testing device for an electromagnet, and the device comprises an oil inlet plate which is internally provided with a three-way oil channel; the oil inlet joint is mounted on the oil inlet plate; an oil duct in the oil inlet joint is communicated with a first end of the three-way oil duct; the rail pressure sensor is mounted on the oil inlet plate; an oil duct in the rail pressure sensor is communicated with a second end in the three-way oil duct; an electromagnet; the electromagnetic valve further comprises a sealing base plate, the electromagnet is installed on the electromagnetic valve installation face in the oil inlet plate through a fastener and presses the sealing base plate on the electromagnetic valve installation face in the oil inlet plate, an oil cavity is formed in the sealing base plate, and the oil cavity is communicated with the third end in the three-way oil way. The liquid medium can carry out pulse testing on the electromagnet in the oil cavity through different pressures. The device is simple and compact in structure, the strength of the electromagnet can be tested according to different rail pressure pulses, a more impact-resistant electromagnetic material is selected to meet the reliability requirement according to the pulse test result, and a scientific basis is provided for fuel system electromagnet material selection.

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 present application discloses a high-efficiency treatment device for waste oil barrels, which relates to the technical field of crushing devices, and comprises a platform and a rear cover, a pressure plate and an electric push rod arranged on the upper end surface of the platform, wherein one side of the pressure plate is slidably connected with a pressure rail, and the pressure rail has a built-in slide rail and a motor; a feed port and a discharge port are respectively provided at the bottom of the rear cover, and a crushing mechanism is arranged inside the rear cover; a conveyor belt is arranged below the rear cover; a wheel groove is provided on the platform, a rotating wheel is connected in the wheel groove, a rotating motor is connected to the rear side of the rotating wheel, and a main shaft is arranged at the output end of the rotating motor; the crushing mechanism comprises a horizontal crushing device and a vertical crushing device; a plurality of crushing teeth are arranged at the bottom of the vertical crushing device; a plurality of magnetic columns are fixed on the rotating wheel, and magnets are arranged inside the magnetic columns; a material insertion port is provided at the top of the rear cover; and a technical effect of improving the crushing efficiency of the crushing mechanism and improving the overall service life of the device is achieved.

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 application aims to provide a method for regulating the consistency of injector injection of each cylinder of an engine considering transient supply-injection disturbance, belonging to the field of engines. First, the rail pressure curve, the injector inlet pressure curve, the driving current curve and the injection rate curve data under different supply time and injection time are obtained on a high-pressure fuel injection system test bench to construct a data set. Then, based on the data set, a Transformer time series model is established with the rail pressure, pressure and current curve as input and the injection rate as output, the injection rate is predicted online and the injection quantity is calculated through time integration. Next, through the programmable logic controller, the injection pulse width under different supply and injection time is feedback regulated to realize the accurate control of the injection quantity of single and multiple injections of each cylinder. The application effectively responds to the supply-injection disturbance under transient working condition, improves the consistency of the injection quantity of each cylinder, and improves the combustion efficiency and running stability of the engine.

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 present invention is applicable to the field of engine fuel pretreatment technology and provides a micro hydrogen bubble / diesel fuel preparation and supply device, comprising: a fuel tank, a controllable oil valve, a diesel filter, a three-way valve, a low-pressure fuel pump, a nanobubble generator, a first hydrogen bubble / diesel fuel storage device, an electronic control unit, a second hydrogen bubble / diesel fuel storage device, a high-pressure fuel pump, a high-pressure fuel rail, a fuel injector, an engine, and a hydrogen supply and hydrogen detection seal. The diesel flow channel between the fuel tank and the high-pressure fuel pump constitutes the low-pressure fuel circuit. The fuel tank outlet is connected to the inlet of the controllable oil valve, the outlet of the controllable oil valve is connected to the inlet of the diesel filter, the outlet of the diesel filter is connected to the first inlet of the three-way valve, and the third outlet of the three-way valve is connected to the inlet of the low-pressure fuel pump. The present invention provides a micro hydrogen bubble / diesel fuel preparation and supply device, and the fuel rail pressure sensor can measure the fuel rail pressure and transmit the signal to the electronic control unit.

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.

An adjustable ultrasonic fatigue test horn for longitudinal-torsional combined vibration and a test method thereof are disclosed. The horn's structural features include: a circular concave surface is provided in the middle of the rectangular side plane of the upper circumference of the horn, which is bolted to a rail pressure plate; a central locking bolt passes through the central through-hole of a torsion adjustment body and the rail pressure plate and is threadedly connected to the central screw hole of the circular concave surface; angle fixing members with L-shaped steps, smaller on the outside and larger on the inside, are provided on the inner surfaces of both sides of the torsion adjustment body; the angle fixing members cooperate with the steps on the circumference of the rail pressure plate; and the angle locking bolts pass from the inside to the outside through the angle fixing members and the torsion adjustment body before being connected to the angle locking nuts. Using this horn for ultrasonic fatigue testing, the torsional vibration amplitude can be freely adjusted to obtain the harmonic response and fatigue life of the specimen under different longitudinal-torsional combined vibration conditions. This provides a more accurate and reliable test basis for the fatigue resistance design, fatigue mechanism research, and life prediction of high-speed and aged mechanical components under longitudinal-torsional combined vibration conditions.

The present invention provides a method, device, electronic device, and storage medium for correcting injection rail pressure, belonging to the technical field of diesel engine fuel system control technology, and is applied to a high-pressure common rail fuel system, wherein the high-pressure common rail fuel system includes a current working cylinder and multiple cylinders to be worked. The method comprises: determining a target cylinder corresponding to the current working cylinder among the multiple cylinders to be worked; determining a rail pressure correction value for the target cylinder during its last injection; obtaining a reference rail pressure for the current working cylinder based on a rail pressure sensor disposed at the fixed position; and using the sum of the reference rail pressure and the rail pressure correction value as the injection rail pressure for the next injection of the current working cylinder. The present invention eliminates the need for designing dynamic interrupts for collecting rail pressure, avoids conflicts and other issues associated with dynamic interrupts, improves safety during injection, and increases the accuracy of the ultimately determined injection rail pressure, thereby improving fuel injection precision.

The purpose of the present invention is to provide a design method for an injection law observer of an electronically controlled fuel system based on LQR, comprising the following steps: establishing a mathematical model of the injection law based on instantaneous common rail pressure, identifying the parameters of the working point model, constructing a state space model, and designing a closed-loop observer of the injection law based on LQR. The present invention establishes a nonlinear model of the injection law based on the instantaneous rail pressure, and performs linearization and model parameter identification at the working point. By selecting three variables, namely, the instantaneous pressure of the common rail pipe, the injection rate, and the rate of change of the injection rate, an observable state space model is established. Based on the established state space model, a real-time observation method of the injection law based on LQR is proposed. The performance of the observer is adjusted by the state error weighting matrix and the output error feedback control weighting matrix to achieve the optimal design of the feedback gain of the closed-loop observer.

The invention relates to a high-pressure common-rail fuel system diagnosis method and device, electronic equipment and a storage medium, and belongs to the technical field of high-pressure common-rail fuel system diagnos.The method comprises the steps that operation data of a high-pressure common-rail fuel system in the operation process is obtained; the operation data comprises actual rail pressure, first target rail pressure and second target rail pressure; the actual rail pressure is controlled to be increased to the first target rail pressure, the pressure increasing duration is obtained, and the pressure increasing duration serves as the pressure building time; the actual rail pressure is controlled to be reduced from the first target rail pressure to the second target rail pressure, the pressure reduction duration is obtained, and the pressure reduction duration serves as pressure relief time; therefore, the high-pressure common-rail fuel system can be diagnosed according to the pressure buildup time and the pressure relief time after the high-pressure common-rail fuel system is integrally pressurized and depressurized, so that the diagnosis process of the high-pressure common-rail fuel system is convenient and efficient.

The present invention discloses an exhaust gas treatment control method, comprising: detecting and acquiring pre- and post-treatment NOx emission concentrations, and determining a target NOx emission ratio at the inlet of the post-treatment device and a specific NOx emission ratio based on the pre- and post-treatment NOx emission concentrations; determining a combustion mode coefficient request value and an actual combustion mode coefficient value based on the target NOx emission ratio and the specific NOx emission ratio at the inlet of the post-treatment device; determining a final output combustion mode set value based on the request and actual combustion mode coefficient values; determining a combustion mode interpolation, an air-fuel ratio interpolation, a fuel rail pressure interpolation, an injection angle interpolation, and an ignition angle interpolation based on the final output combustion mode set value; and using the air-fuel ratio interpolation, fuel rail pressure interpolation, injection angle interpolation, and ignition angle interpolation to control engine combustion. The present invention fully utilizes the advantages of lean fuel consumption and reduces the emission risks caused by lean combustion.

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.

The application discloses a method for estimating fuel injection quantity of a high-pressure common rail system based on Kalman filtering and a cascade closed-loop control method, and belongs to the technical field of diesel engine fuel system control. The method for adjusting fuel injection quantity based on rail pressure considers noise, uncertain interference and model nonlinearity in engineering application, and the application adopts a cascade closed-loop control method. The cascade control comprises fuel injection quantity closed loop and rail pressure closed loop. In the fuel injection quantity closed loop, the method based on Kalman filtering is used to estimate fuel injection quantity in real time, and the real-time estimated fuel injection quantity is used as feedback for fuel injection quantity closed loop control. Meanwhile, the target rail pressure is calculated through the real-time estimated fuel injection quantity, and the target rail pressure is used as input to control the rail pressure closed loop. The pressure of the common rail is the output and feedback of the rail pressure closed loop. The application can realize fuel injection quantity closed loop control of the high-pressure common rail system under different working conditions, thereby effectively guaranteeing the consistency and reliability of cycle fuel injection performance.