40results about How to "Guaranteed fuel economy" patented technology

The embodiment of the invention provides an in-loop rapid simulation test system of an unmanned vehicle. The system comprises: a virtual simulation test subsystem used for generating a virtual test scene and transmitting a pavement state control instruction to a test bench control subsystem; the test bench control subsystem used for simulating a pavement state, as well as estimating the driving performance of the unmanned vehicle according to driving parameters of the unmanned vehicle; and an unmanned vehicle control subsystem used for performing driving control on the unmanned vehicle according to the virtual test scene. The above system adopts the simulation test mode of combining the virtual reality technology with the hardware in-loop, so that a controllable, repeatable and effective in-loop rapid simulation test of the unmanned vehicle can be achieved indoors; and furthermore, all extreme or special road conditions are exhausted as much as possible, so that the safety and the reliability of the unmanned vehicle before start off can be fully guaranteed. The embodiment of the invention further provides an in-loop rapid simulation test method of the unmanned vehicle.

The invention discloses a locking and unlocking device of a crawler-type engineering machinery hydraulic torque converter and a control method thereof. The locking and unlocking control parameters are the turbine revolution, gear shift signals and accelerator signals; the device comprises a turbine revolution speed sensor, a gear shift signal sensor, an accelerator signal sensor, a locking and unlocking mode selection switch, a micro computer controller, a brake signal sensor, a driving power supply and an electrohydraulic locking and unlocking device; the locking and unlocking mode selection switch, the turbine revolution speed sensor, the gear shift signal sensor, the accelerator signal sensor and other units collect data; the data are input in the micro computer controller; and the micro computer controller processes the input information, and outputs the information to the electrohydraulic locking and unlocking device, thus the locking and unlocking operations of the hydraulic torque converter are realized. Because three parameters are adopted to act as the locking and unlocking control parameters, the motive power performance and the economical efficiency are compatible, and the working efficiency and the comprehensive using performance of the engineering machinery hydraulic torque converter are improved obviously. The device provided by the invention has a simple structure, is convenient to operate and use, and has good stability and high reliability.

The invention discloses an automatic speed changer gear shifting point predicting control method based on a vehicle-mounted navigation system. The method comprises the steps that firstly, current vehicle structure parameters, state parameters and power transmission system parameters are determined; secondly, front road feature parameters are extracted; thirdly, the future vehicle state is predicted on the basis of the feature parameters; fourthly, work condition division is conducted according to the future vehicle state, the speed changer gear meeting the needed torque and the rotation speedneeded by an engine is selected, the fuel consumption rate corresponding to the gear is calculated, the gear where the fuel consumption rate is the lowest serves as the predicted target gear, the changing difference value between the current gear and the predicted target gear is calculated, and work condition division is conducted; and fifthly, the optimal gear shifting method is formulated for different work conditions. On the premise that dynamic performance, driving controllabitity and safety are guaranteed, rolling optimization of gear shifting points can be achieved, the automatic speed changer gear shifting point predicting control method better adapts to the whole vehicle dynamic character, and optimal matching of the dynamic performance and economic efficiency is achieved.

The invention provides a hydraulic automatic gear shifting device of a crawler-type engineering machinery and a control method thereof. The hydraulic automatic gear shifting device is characterized in that shift control parameters are turbine revolutions and accelerator signals. The device comprises a turbine speed sensor, an accelerator signal sensor, a brake signal sensor, a gear shifting mode selection switch, a gear shifting signal sensor, an ECU (electronic control unit), a drive power supply and an electro-hydraulic gear shifting device, wherein the gear shifting mode selection switch, the turbine speed sensor, the accelerator signal sensor, the brake signal sensor and the gear shifting signal sensor are used for collecting data and then sending the data into the ECU (Electronic Control Unit); and the ECU is used for processing the input information and outputting the processed input information to the electro-hydraulic gear shifting device to realize the operation of gear shifting. According to the control method of the automatic gear shifting, the dynamic property and economical property of the drive system are considered; and the work efficiency and comprehensive performance of the crawler-type engineering machinery can be obviously improved.

The invention discloses an input split type hybrid power flow control method and relates to the technical field of vehicle hybrid power. The method comprises, based on the input split type rotating speed and rotating torque coupling relationship, enabling an engine to be in a rotating speed control mode, and a generator and an electromotor to be in a rotating torque control mode; starting from the target power of a battery pack and a driving required power and based on an optimal fuel economy working curve, determining the working points of the engine, the generator and the electromotor, and meanwhile, ensuring the balance between electric quantity and power of batteries. According to the input split type hybrid power flow control method, firstly, the driving required power and the target power of the battery pack are determined, so that under the premise of ensuring vehicle dynamic performance, the regulating manner of the generator and every electromotor can be determined according to the characteristics of a input split type hybrid power system and accordingly the working points of every power unit can be adjusted flexibly, and further the fuel economy can be enhanced; through power flow control, the power and the electric quantity of the batteries can be in a reasonable state, over-charging or over-discharging of the batteries can be avoided, the system performance can be improved and the service life of the batteries can be prolonged.

The invention aims to provide an electromagnetic control pressure-storage and pressure-stabilizing oil sprayer. The oil sprayer comprises an oil sprayer head, an oil sprayer body, a flow limiting assembly, a needle valve reset spring, a spray nozzle, a needle valve, a cap nut, an electromagnetic valve assembly and a locking sleeve. The structure of the flow limiting assembly is adopted in the oil sprayer, therefore, fuel oil economy reduction caused due to the fact that the oil sprayer sprays oil abnormally and interruptedly can be effectively avoided and the working reliability of oil sprayer is guaranteed. A pressure storage cavity in the oil sprayer body can reduce pressure fluctuation caused in the fuel oil injection process and facilitate accurate control over oil spraying stability. Meanwhile, when the oil sprayer is used in a common rail fuel oil system, the structural size of a common rail pipe can be reduced, therefore, the requirements for strength of materials of the common rail pipe are reduced, the service life can be prolonged and the spatial utilization rate can be increased. The action process of the needle valve is directly driven by a solenoid valve, the response speed of the needle valve is high, the control precision is high, oil spraying is regular, flexible and changeable, the dynamic property and the economy of a diesel engine are effectively improved, and therefore the diesel engine can meet stricter emission regulations.

The invention provides an energy management system for a range extending type electric car and a method thereof. The energy management system comprises a car controller, a power battery, an energy input part and an energy output part; the car controller is connected with the power battery through low-voltage wires, the energy input part and the energy output part are connected with the power battery, the energy input part comprises a range extender unit and a driving and energy recovery unit, and the energy output part comprises a high-voltage auxiliary unit and a driving and energy recovery unit. The method comprises the steps that firstly, first-order regulation is performed on the energy input part and the energy output part through thresholds; secondly, further second-order regulation is performed on the energy input part and the energy output part according to SOC, the state of charge of the power battery, and the efficiency of the energy management system is effectively improved.

The embodiment of the invention discloses a coordinated control method, system and device for engine and clutch during gear shifting, relating to the technical field of a powertrain system for coordinated control of an engine and a clutch of a vehicle equipped with a mechanical automatic transmission or a dual clutch transmission to enable the vehicle to maintain good acceleration tracking performance during gear shifting. The coordinated control method of the engine and the clutch in the transmission shifting process comprises the following steps: obtaining a target engine speed and an engineflywheel output torque, wherein the target engine speed is calculated by introducing a clutch slip rate and an engine idle speed; Using the target engine speed and the output torque of the engine flywheel end as inputs, obtaining a throttle opening degree by querying a pre-stored engine torque characteristic curve diagram; the ignition timing of the engine is calculated and adjusted according tothe actual engine speed and the throttle opening.

A gear recommending method for an AMT vehicle in a manual mode comprises the following steps that (a) when the vehicle operates, a terminal control unit (TCU) checks the running mode of the AMT vehicle; (b) whether a gear function key F on a gear shifting handle is pressed for more than N seconds or not is detected; (c) the TCU sends the current gear n1 and a recommended gear n2 to a controller area network (CAN) bus; (d) an instrument controller (CBCU) receives the current gear n1 and the recommended gear n2 from the CAN bus; (e) the CBCU judges whether n1 is equal to n2; (f) if n1 is not equal to n2, the CBCU controls an alarm device to give out an alarm after M seconds; and (g) the TCU checks the running mode, and if the manual mode of the AMT is off, the TCU quits from a recommended gear module in the manual mode. By adoption of the steps, in the manual mode of the AMT vehicle, a driver can still choose a proper running gear according to a prompt on an instrument panel.

The invention discloses a hybrid electric vehicle power source power limiting method, belonging to the technical field of hybrid electric vehicle control. The method comprisesdetermining the upper andlower limits of battery output power and determining the upper and lower limits of motor output torque. The method takesthebattery, conditions of use of electric machines, fault state and its own characteristics for battery charging and discharging power, the output torque limit of the motor into account, whichcan effectively prolong the battery, the service life of the motor and improve the safety of the battery and the motor in the process of use, and at the same time output the larger power as far as possible to ensure the power and fuel economy, which is very important for the safety of passengers and vehicle components in the process of driving.

The invention provides a vehicle second-level oil pump control system and method. The method includes the steps of generating a control signal on the basis of at least one control parameter, and changing the working state of a second-level oil pump on the basis of the control signal. The vehicle second-level oil pump control system and method can accurately control the working state of the second-level oil pump.

The invention discloses a dual-motor hybrid driving system. The system includes a first driving part and a second driving part which are used for driving axles. The first driving part includes an engine, a first gear pair, a clutch and a first motor which are connected in a power transmission direction in sequence. The second driving part includes a second motor, wherein the transmission ratio ofthe first gear pair is smaller than 1. By means of the scheme, the engine can work within a rotation speed range, and meanwhile, the size of the motors are reduced, wherein the fuel economy within therotation speed range is great.

The invention discloses a water temperature control method of an AMT vehicle type hydraulic retarder and a control method thereof, which comprise a vehicle body control unit BCU, an engine electronic control unit ECU, an automatic transmission electronic control unit TCU, a gear box executing mechanism and a hydraulic retarder, wherein the engine electronic control unit ECU, the automatic transmission electronic control unit TCU and the hydraulic retarder are respectively connected to the vehicle body control unit BCU. According to the invention, the beneficial effects are: the reliable safety performance when a vehicle is driven downhill is ensured; at the same time, when an engine is ensured to work within reasonable work temperature range, the engine fuel economy performance is ensured; when the retarder has sufficient brake torque during downhill, the damage to a friction piece is reduced by slight using or disusing a main brake to brake; at the same time, a water tank watering the friction piece during downhill can be eliminated, thus more goods can be carried; and the value at the safety and economy aspects is high.

The invention discloses an automobile driving control method, automobile driving control equipment and a storage medium. The method comprises the steps: acquiring current vehicle state data of a four-wheel drive automobile; identifying a driving intention based on the current vehicle state data, and determining a target driving mode according to the driving intention; based on the target driving mode and a preset execution control strategy, determining a distribution output torque and an initial execution state corresponding to driving execution units in the four-wheel drive automobile; and based on the distribution output torque and the initial execution state, controlling all driving execution units in the four-wheel drive automobile to work cooperatively. According to the method, the efficiency of controlling the cooperative work of the plurality of driving execution units can be effectively guaranteed, so that the dynamic property, fuel economy, cross-country trafficability and operation stability of the whole vehicle are effectively guaranteed when the four-wheel drive vehicle runs in the target drive mode.

The invention provides a mode switching system and method for a hybrid electric vehicle with the function of external connection. The mode switching system comprises a manual button, a central processing unit, an electric motor flywheel rotating speed sensor, an engine flywheel rotating speed sensor, an engine controller and an electric motor controller, wherein the manual button is used for performing system mode manual switching by a driver; the central processing unit is used for receiving and transmitting electrical signals of the manual button, the electric motor flywheel rotating speed sensor, the engine flywheel rotating speed sensor, the electric motor controller and the engine controller; the electric motor controller is used for controlling the operation of an electric motor; the engine controller is used for controlling the operation of an engine; the electric motor flywheel rotating speed sensor is used for collecting a flywheel rotating speed signal of the electric motor; the engine flywheel rotating speed sensor is used for collecting a flywheel rotating speed signal of the engine. Through the adoption of the mode switching system disclosed by the invention, frequent charging processes and frequent discharging processes of an accumulator group are avoided, the service life of an accumulator is prolonged, and the operational efficiency of the accumulator is improved.

The invention discloses an automobile quick starting method, device and equipment and a storage medium. The automobile quick starting method comprises the steps that the current shutdown phase of an engine of an automobile is obtained, wherein the shutdown phase comprises a first shutdown phase stored in a first electronic control unit of the automobile and a second shutdown phase stored in a second electronic control unit of the automobile; whether a difference value between the first shutdown phase and the second shutdown phase is within a preset threshold range or not is judged; and if the difference value is within the preset threshold value range, the first shutdown phase or the second shutdown phase serves as a target phase of the engine to complete synchronization of a target crankshaft signal. Whether the current shutdown phases stored in two electronic control units meet the preset conditions or not is judged, whether the current shutdown phases stored in the two electronic control units are directly used for starting the engine of the automobile or not is judged, quick starting of the engine can be achieved, and the time consumed for starting synchronous identification of the engine of the automobile is shortened.

The invention discloses a water temperature control method and a control system for a hydraulic retarder of an AMT vehicle type, which includes a body controller BCU, an engine electronic control unit ECU, an automatic transmission electronic control unit TCU, a gearbox actuator and a hydraulic retarder. The retarder, the engine electronic control unit ECU, the automatic transmission electronic control unit TCU and the hydraulic retarder are all connected to the body controller BCU. The beneficial effects of the present invention are: ensuring reliable safety performance when going downhill; at the same time ensuring that the engine works within a reasonable working temperature range and ensuring fuel economy of the engine; when going downhill when the retarder has sufficient braking torque , without or less use of the main brake, the loss of the friction plate is reduced, and at the same time, the water tank that pours water on the friction plate can be abandoned when going downhill, and more goods can be carried; the present invention has high safety and economical aspects the value of.

The invention discloses a switching type driving device for a hybrid vehicle, which is a driving device belonging to the technical field of new energy power dividing hybrid power electric drive assemblies. The invention aims to provide a transmission device with better dynamic property and economy. According to the technical scheme, the double-selection connection switching device comprises a driving unit, a first driven unit and a second driven unit, and the driving unit is rotationally connected with the first driven unit and the second driven unit in a switching mode. The first driven unitis coaxially connected with a planet carrier of a planet row in an integrated rotating mode, and the second driven unit is coaxially connected with an inner gear ring of the planet row in an integrated rotating mode. The invention provides a switching type driving device for a hybrid vehicle, which can directly output all engine power and torque to a wheel end when the vehicle speed is higher, andcan realize better dynamic property and economy.

The invention provides a dual-mode hybrid vehicle dual-motor parameter matching method and device. The dual-mode hybrid vehicle dual-motor parameter matching method comprises the steps that first parameters are acquired, the first parameters are parameters of a first motor, and the whole vehicle is enabled to meet the preset requirement of fuel economy by the first parameters; and second parameters are acquired, the second parameters are parameters of a second motor, and the whole vehicle is enabled to meet the preset requirement of power performance by the second parameters. According to the method, power performance of the whole vehicle can be ensured and fuel economy of the whole vehicle can also be ensured in the parameter matching process.

The invention provides a limited variable-speech cruise method for a vehicle. By means of the vehicle internet, speed and power data of the vehicle during constant-speed cruise are collected, the power data are converted into gaussian distribution data with a load coefficient as a mathematical expectation through gaussianization, and different load coefficients are clustered from the gaussian distribution data; a speed and power characteristic curve is fitted from rotation speed and power historical data which the load coefficients belong to by means of a cubic polynomial; speed and power data of the vehicle are sampled in real time, are uploaded to a vehicle internet center and are matched with the characteristic curve fitted by the vehicle internet center, and accordingly a currently matched characteristic curve is obtained; oil consumption of the vehicle cruising at different speeds in a limited interval is predicted by means of rules of the matched characteristic curve, the cruising speed is trimmed from the limited interval to an engine economic interval according to the prediction result, and the aim of improving economy of oil consumption of the vehicle during cruising is achieved. By means of the limited variable-speech cruise method, oil conservation of the vehicle can be guaranteed in the whole cruising process, and the function of saving oil is automatically achieved.

The invention discloses a locking and unlocking device of a crawler-type engineering machinery hydraulic torque converter and a control method thereof. The locking and unlocking control parameters are the turbine revolution, gear shift signals and accelerator signals; the device comprises a turbine revolution speed sensor, a gear shift signal sensor, an accelerator signal sensor, a locking and unlocking mode selection switch, a micro computer controller, a brake signal sensor, a driving power supply and an electrohydraulic locking and unlocking device; the locking and unlocking mode selection switch, the turbine revolution speed sensor, the gear shift signal sensor, the accelerator signal sensor and other units collect data; the data are input in the micro computer controller; and the micro computer controller processes the input information, and outputs the information to the electrohydraulic locking and unlocking device, thus the locking and unlocking operations of the hydraulic torque converter are realized. Because three parameters are adopted to act as the locking and unlocking control parameters, the motive power performance and the economical efficiency are compatible, and the working efficiency and the comprehensive using performance of the engineering machinery hydraulic torque converter are improved obviously. The device provided by the invention has a simple structure, is convenient to operate and use, and has good stability and high reliability.

The invention discloses a hybrid electric vehicle power source power limiting method, belonging to the technical field of hybrid electric vehicle control. The method comprisesdetermining the upper andlower limits of battery output power and determining the upper and lower limits of motor output torque. The method takesthebattery, conditions of use of electric machines, fault state and its own characteristics for battery charging and discharging power, the output torque limit of the motor into account, whichcan effectively prolong the battery, the service life of the motor and improve the safety of the battery and the motor in the process of use, and at the same time output the larger power as far as possible to ensure the power and fuel economy, which is very important for the safety of passengers and vehicle components in the process of driving.

The invention discloses an automatic free hub device for a vehicle, which comprises a half shaft, an inner shell, a transmission sleeve, a displacement pin, a one-way clutch and a hub. The half shaft cooperates with the transmission sleeve through the helical spline, and the transmission sleeve is connected with the wheel hub through the one-way clutch. In the four-wheel drive mode, the half shaft drives the transmission sleeve to drive the hub to rotate, and at the same time, the half shaft and the hub are locked together by the shift pin. In the two-wheel drive mode, the half shaft and the hub can be automatically unlocked. The invention also provides an automobile using the automatic free wheel hub device. The present invention adds a new structure and mechanical design on the basis of the structure of the traditional free hub. The processing and transformation process is relatively simple, and the transformation cost is relatively low. It relies on the cooperation between the spline screw drive sleeve and the one-way clutch of the one-way The characteristics of power transmission are used to realize the switch between four-wheel drive and two-wheel drive, and the switch between four-wheel drive and two-wheel drive can be automatically realized without manual control of the joystick or electronic control knob to realize time-sharing four-wheel drive.

The invention relates to the technical field of internal combustion engines, and discloses an internal combustion engine, which comprises: a cylinder block, and a cylinder barrel is arranged on the cylinder block; a cylinder liner is arranged in the cylinder barrel; a piston is telescopically arranged in the In the cylinder liner; the cylinder head, the cover is arranged on the cylinder barrel; the combustion chamber is located on the piston and the cylinder head; the flow guide part is arranged in the combustion chamber, and is used to restrict the fluid It flows between the piston and the cylinder head to the cylinder liner, thereby preventing the combustible mixture from expanding and burning near the cylinder liner, avoiding the wear and deformation of the cylinder liner under high temperature load for a long time, and ensuring The power and fuel economy of the internal combustion engine are improved, and the service life of the internal combustion engine is extended.

The invention discloses a power test valve block for a power matching test of a rotary drilling rig. The power test valve block comprises a pilot valve, stop valves, flowmeters and pressure sensors, wherein the stop valves comprise a first stop valve and a second stop valve; the pressure sensors comprise a first pressure sensor and a second pressure sensor; the flowmeters comprise a first flowmeter and a second flowmeter. The invention further discloses a power matching test device for the rotary drilling rig. The power matching test device comprises a pilot pump, overflow valves, main pumps,reversing valves, a power head motor and the power test valve block, wherein the reversing valves comprise a first reversing valve and a second reversing valve; the overflow valves comprise a first overflow valve, a second overflow valve and a third overflow valve; the main pumps comprise a first main pump and a second main pump. The power test valve block and the power matching test device are simple in structure and convenient to use, test cost is low, basis is provided for adjusting absorbing power of the pumps and output power of an engine, so that good matching of the absorbing power of the pumps with the output power of the engine is realized, fuel economy of the rotary drilling rig is guaranteed, and the service life of the rotary drilling rig is prolonged.

In order to solve the technical problem that an existing dual-output transmission automatic transmission has high requirements for synchronous control precision of two motors, the invention provides adual-output transmission automatic transmission. A special transmission line is designed, as long as three planet rows meet a specific speed ratio relation, it can be guaranteed that the rotating speed of the first output shaft and the rotating speed of the third output shaft are the same in a straight moving mode, and the requirement for the synchronous control precision of the two driving motors is avoided; moreover, an internal combustion engine or a driving motor can be switched to provide power according to different working conditions, and when the power provided by the internal combustion engine is excessive, the first driving motor can be changed into a generator to convert and store excessive energy or provide the excessive energy to the second driving motor, so that the internalcombustion engine can always work at the position of the optimal efficiency point, and the fuel economy is ensured.

The invention discloses a driving management method for platoon vehicles based on aerodynamic optimization, comprising: collecting the driving speed of a single vehicle in platoon through a vehicle speed sensor; The air resistance C and the vehicle x i Air resistance C i , and transmit the data to the remote tolling calculation platform for vehicles in the queue; when the charging system determines that the fee is deducted, the vehicle in the vehicle in the queue needs to pay a certain fee to compensate other vehicles in the vehicle in the queue; when the charging system determines that it is compensation, The car in the queue will receive an amount of money to compensate for the driving consumption during the queue. The invention can fairly distribute the fuel saving of each vehicle in the queue, and ensure the benefit compensation of individual vehicles while ensuring the fuel economy of the vehicles in the entire queue; it has better management scope and flexibility.

The invention discloses a starting power generation system for an auxiliary power unit for a vehicle. In the engine starting process, a permanent magnet motor is subjected to constant torque control to drive an engine to ignite, and when an engine speed reaches the idle speed, the output torque of the permanent magnet motor is controlled to be zero. In the power generation process, a running speedcommand of the engine and a torque command value of the permanent magnet motor are obtained through table look-up according to a generated power request of the system and a universal characteristic curve of the engine. The engine performs closed-loop control according to a speed command value obtained by table look-up, and the stability of the engine speed is realized by adjusting the engine throttle opening degree in real time. The permanent magnet motor obtains a torque current command value through table look-up according to a torque command, and realizes the current closed-loop control through a PI regulator. According to the starting power generation system for the auxiliary power unit for the vehicle, the starting torque is stable, and the engine can be successfully started; and thequality of electric energy is high during power generation, and the fuel economy of the engine is good.

The invention provides a hydraulic automatic gear shifting device of a crawler-type engineering machinery and a control method thereof. The hydraulic automatic gear shifting device is characterized in that shift control parameters are turbine revolutions and accelerator signals. The device comprises a turbine speed sensor, an accelerator signal sensor, a brake signal sensor, a gear shifting mode selection switch, a gear shifting signal sensor, an ECU (electronic control unit), a drive power supply and an electro-hydraulic gear shifting device, wherein the gear shifting mode selection switch, the turbine speed sensor, the accelerator signal sensor, the brake signal sensor and the gear shifting signal sensor are used for collecting data and then sending the data into the ECU (Electronic Control Unit); and the ECU is used for processing the input information and outputting the processed input information to the electro-hydraulic gear shifting device to realize the operation of gear shifting. According to the control method of the automatic gear shifting, the dynamic property and economical property of the drive system are considered; and the work efficiency and comprehensive performance of the crawler-type engineering machinery can be obviously improved.

The object of the present invention is to provide a pressure accumulating flow-limiting electromagnetic control fuel injector, including a fuel injector head, a fuel injector body, a current limiting assembly, a solenoid valve assembly, a needle valve return spring, a positioning pin, a nozzle, a needle valve, a needle Valve stoppers, seats, caps and seals. There is a pressure accumulator on the injector body, and the pressure accumulator is respectively connected with the main oil inlet hole on the injector head and the first oil through hole on the limit block, and the flow limiting component is installed in the injector body. The lower end of the flow limiting assembly communicates with the fuel oil passage in the injector body, the needle valve chamber communicates with the second oil chamber through the fourth oil inlet hole on the needle valve limit block, and the first oil chamber communicates with the second oil chamber through the third oil inlet hole on the valve seat. The oil inlet hole is connected with the high-pressure fuel oil circuit in the injector body, and the oil drain port is connected with the oil return port through the low-pressure oil circuit in the injector body. upper end. The invention has the advantages of fast response speed, high control precision, flexible fuel injection rule and stable operation when spraying with small fuel injection quantity.