38 results about "Crankshaft position sensor" patented technology

The utility model belongs to the technical field of diesel engines, and relates to a hydrogen fuel single-cylinder engine which comprises a piston and a piston pit located at the end of the piston, and the piston pit is of a shallow-basin-shaped structure. The system further comprises a hydrogen inlet system and an electric control system, the hydrogen inlet system comprises a hydrogen sprayer, a hydrogen cylinder, a gas delivery pipe and a pressure increasing valve, the electric control system comprises a control unit, an electronic accelerator and a crankshaft position sensor, the hydrogen cylinder is communicated with the hydrogen sprayer through the gas delivery pipe, the hydrogen sprayer is communicated with the combustion chamber, and the pressure increasing valve is arranged on the gas delivery pipe. And the control unit is electrically connected with the hydrogen sprayer, the electronic throttle and the crankshaft position sensor respectively. The structure of the piston pit is improved, the electronic control gas injection system and the fuel oil injection system are adopted to replace a traditional pure fuel oil injection system, timing and quantification of hydrogen gas injection can be guaranteed, good economical efficiency is achieved, and the hydrogen gas replacement rate can reach about 90%; pollutant emission is greatly reduced, and low oil consumption is kept.

The invention discloses an engine control method and system, a range extender, a range-extended automobile and electronic equipment, and relates to the technical field of vehicle control. The method is applied to the range extender, an engine and a motor of the range extender are controlled through the same control unit, a cam shaft and a crankshaft of the engine are positioned and installed, and the rotation angle of the crankshaft is determined based on the angle signal of the motor by obtaining the angle signal of the motor and the angle signal of the cam shaft; and cylinder judgment is conducted on the engine, cylinder judgment information is obtained, and oil injection ignition of the engine is controlled based on the rotation angle of the crankshaft and the cylinder judgment information. Therefore, the problem that the cost of the whole vehicle is high due to the fact that the range extender of the range-extending type automobile needs to be provided with a crankshaft position sensor, a camshaft position sensor and a motor position sensor for signal collection is solved.

An internal combustion engine control device for a vehicle, the internal combustion engine control device comprising: a crankshaft position sensor system (200) comprising at least one crankshaft position sensor and detecting an angular velocity of a crankshaft of an internal combustion engine, an air compressor (100) to which a driving force of the internal combustion engine is transmitted from an output end of the internal combustion engine, an injector (400) for injecting fuel, and a control device (300) which determines whether the injector (400) is malfunctioning based on a difference in a variation in the angular velocity of the crankshaft between a plurality of cylinders of the internal combustion engine, wherein the air compressor (100) and the output end of the internal combustion engine are arranged so that, immediately after fuel is injected by the injector (400) of the internal combustion engine, a drive torque of the air compressor (100) is periodically applied.

The utility model relates to the technical field of crankshaft position sensors, in particular to a crankshaft position sensor with a good waterproof effect, which comprises an inner shell and resin, the inner wall of the inner shell is fixedly connected with the resin, the inner wall of the resin is movably connected with a coil, the inner wall of the coil is electrically connected with a circuit, and the inner wall of the coil is electrically connected with a permanent magnet. And the outer wall of the inner shell is connected with a dismounting mechanism. After the inner shell is screwed into the connecting frames in a threaded mode for position fixing, the front shell and the tail shell are screwed into the upper connecting frame and the lower connecting frame, the front shell and the tail shell are assembled in a sealed mode through rubber rings in the connecting frames, and a certain buffering distance exists between the inner shell and the tail shell and between the inner shell and the front shell through connection between the inner shell and the connecting frames. Direct contact between the interior of the inner shell and external force is avoided, and the service life is prolonged.

The utility model relates to the technical field of range extender engines, in particular to a range extender capable of improving reliability and reducing oil consumption and a range-extended vehicle. The range extender comprises an engine, a generator and a front end wheel train. The generator and the front-end wheel train are arranged at the two axial ends of a crankshaft of the engine respectively, the front-end wheel train is provided with a transmission wheel set and a crankshaft position sensor, and one belt pulley of the transmission wheel set is provided with a signal gear ring. In the application, any belt pulley in the transmission wheel set of the front wheel train is provided with the signal gear ring, and the crankshaft position sensor is aligned with the signal gear ring to detect the rotation state of the crankshaft. Therefore, on the basis that a flywheel shell structure is omitted, the signal gear ring and the front-end gear train are combined, so that the original axial length is kept, and the problem that the crankshaft position sensor is interfered by the generator is solved.

The controller (110) configured to receive crankshaft position signal from a crankshaft position sensor (102) when the vehicle (100) is in motion, characterized in that, the controller (110) further configured to process the crankshaft position signal through a computational module (106), compare output of the computational module (106) with a threshold value, and determine slip in the drive wheel (114) of the vehicle (100) based on the comparison. The controller (110) is configured to monitor angular acceleration of the crankshaft instead of engine RPM, as the crankshaft undergoes different speeds within a combustion cycle based on the stroke, but engine speed would be an average of these varying speeds. The controller (110) is configured / adapted to determine the wheel slip with the crankshaft position sensor (102) by exploiting the effect of the wheel slip on the crankshaft, thus eliminating the need for wheel speed sensors and the encoder wheel assemblies.

The utility model belongs to the technical field of diesel engines, and relates to a hydrogen fuel single-cylinder engine which comprises a piston and a piston pit located at the end of the piston, and the piston pit is of a shallow-basin-shaped structure. The device further comprises a hydrogen inlet system and an electric control system, the hydrogen inlet system comprises a hydrogen cylinder, a gas conveying pipe and an electronic injection valve, the hydrogen cylinder is communicated with the gas inlet channel through the gas conveying pipe, the electronic injection valve is arranged on the gas conveying pipe, and the electric control system comprises a control unit, an electronic accelerator and a crankshaft position sensor. The control unit is electrically connected with the electronic injection valve, the electronic accelerator and the crankshaft position sensor. The structure of the piston pit is improved, the electronic control gas injection system and the fuel oil injection system are adopted to replace a traditional pure fuel oil injection system, timing and quantification of hydrogen gas injection can be guaranteed, good economical efficiency is achieved, and the hydrogen gas replacement rate can reach about 60%; pollutant emission is greatly reduced, and low oil consumption is kept.

The present invention relates to an automated crankshaft position sensor detection device and a process thereof, comprising a workbench, a fixing fixture, a conveying rack group, a wiring rack, a detection block, a signal disk mechanism, a picking mechanism, an output conveyor belt, and a recycling box. The fixing fixture is arranged on the conveying rack group and circulates within the workbench through the action of the conveying rack group. The conveying rack group is connected to the workbench, the wiring rack is arranged on one side of the conveying rack group, the signal disk mechanism is arranged on the other side of the conveying rack group, the detection block is connected to the wiring rack in an adjustable relative position, the picking mechanism is arranged above the conveying rack group, and the output conveyor belt and the recycling box are both arranged at one end of the conveying rack group. The purpose of the present invention is to install the sensor by a fixing fixture, and circulate it by the conveying rack group, detect it through the signal disk mechanism, and screen it through the picking mechanism, thereby achieving the purpose of automated detection of automated crankshaft position sensors, improving product quality, and saving labor costs.

The invention discloses a hybrid vehicle engine front-end wheel train control method and device and a storage medium, and the method comprises the steps: collecting a running signal of a hybrid vehicle, and judging the start-stop working condition trend of an engine of the hybrid vehicle according to the running signal; under the condition that the start-stop working condition trend is that shutdown is about to be carried out, shutdown preparation operation is carried out, and the shutdown preparation operation comprises the steps that a front-end wheel train load is removed through an electromagnetic clutch water pump and / or a transmission chain between an engine and a gearbox is tensioned through pre-tightening torque output by a P2 motor; and under the condition that the start-stop working condition trend is about to start, starting auxiliary operation is executed, and the starting auxiliary operation comprises the steps that a signal of a crankshaft position sensor is combined, auxiliary torque is output through a P2 motor to smoothen engine crankshaft rotation, and / or after the engine rotating speed is stable, an electromagnetic clutch water pump is controlled to load a load for a front end gear train. According to the technical scheme, torque impact of starting and stopping of an engine on a front-end wheel train can be reduced from the source, and the problems of vibration and noise of the wheel train are solved.

The present invention relates to the technical field of sensor detection, and specifically relates to a detection method and system for a crankshaft position sensor. The method includes: collaboratively collecting multi-source associated data around the crankshaft position sensor, collecting the ambient temperature and humidity of the crankshaft position sensor through a temperature and humidity sensor, and collecting the vibration frequency of the engine where the crankshaft position sensor is located by an acceleration sensor according to a set sampling frequency; after data collection is completed, data preprocessing is performed, and a filtering algorithm is used to filter out power line interference and high-frequency noise, eliminate outliers, and perform normalization; after data preprocessing is completed, a fault detection model for the crankshaft position sensor based on an improved neural network is constructed and trained; after training is completed, the preprocessed data of the real-time collected data is input into the model to output a detection result. By combining an improved neural network algorithm, the present invention accurately detects the operating state of the crankshaft position sensor, reduces the risk of sudden faults, and ensures the stable operation of the engine and related equipment.

The invention belongs to the technical field of gas compression of explosion-proof diesel engines, and particularly relates to a gas compression device for an explosion-proof diesel engine, a control method, the explosion-proof diesel engine and a maintenance method. The invention solves the problem of low reliability and high failure rate of a gas compressor in an underground coal mine, and comprises a gas path control module which comprises a gas inlet one-way solenoid valve and an exhaust port one-way solenoid valve and is used for independently controlling the on-off of a gas inlet and an exhaust port; the dynamic sensing module is integrated with a cylinder cover gas pressure sensor, a compressed gas pressure sensor and a crankshaft position sensor; and the intelligent execution module is connected with the modules through an ECU to realize opening and closing of the valve based on crankshaft phase synchronization, dynamic adjustment of an air inlet valve based on cylinder cover pressure and activation of a no-load protection mode based on air pocket pressure. According to the invention, the failure rate is greatly reduced, and meanwhile, the convenience of equipment maintenance is improved.

The utility model relates to a crankshaft position sensor with a double-layer waterproof structure, comprising a housing, a pin, a Hall circuit board, a sealing member and a side cover, two ends of the housing are respectively provided with a socket part and an installation part, the pin is arranged in the housing, and two ends of the pin respectively extend to the socket part and the installation part. The mounting part is clamped with a Hall circuit board used for being electrically connected with a contact pin, the mounting part is in threaded connection with a side cover, the mounting part is clamped with a sealing piece used for being in sealing connection with the side cover, and the sealing piece is provided with a first sealing part used for abutting against the end face of the side cover and a second sealing part used for abutting against the inner side face of the side cover; according to the crankshaft position sensor, the first sealing part and the second sealing part are integrally formed on the sealing piece, axial sealing and radial sealing of the connecting position of the shell and the side cover are achieved through the first sealing part and the second sealing part respectively, the waterproof performance of the crankshaft position sensor is remarkably improved through two innovative sealing structures, and the service life of the crankshaft position sensor is remarkably prolonged through the two innovative sealing structures.

The utility model discloses a crankshaft position sensor, and relates to the field of sensors, the crankshaft position sensor comprises a probe and a wire harness plug connector, the probe is provided with a sealing assembly used for improving the installation sealing performance of the probe, and the wire harness plug connector is provided with a fixing assembly used for fixing a wire on the wire harness plug connector. The fixing assembly comprises concentric-square-shaped plates fixedly connected to the upper side and the lower side of the wire harness plug connector, and a fixing plate is fixedly connected to the middle section in the concentric-square-shaped plates. During use, the U-shaped frame is arranged on a wire in a sleeving mode, then the plug board is pressed to enable the spring to contract, and the plug board is moved into the concentric-square-shaped plates; the two sides of the U-shaped frame are located on the two sides of the wire harness plug connector and the two sides of the concentric-square-shaped plate, then the spring rebounds, the plug plate can be inserted into the plug groove, the U-shaped frame is fixed to the wire harness plug connector, a wire plug is fixed, and the problem that in the using process, vibration and other situations possibly occur, and consequently disengagement occurs is avoided as much as possible.

The present invention provides a method and device for detecting torsional vibration signals in the angle domain of a powertrain, including the following steps: collecting the pulse signal of the engine camshaft signal disk through a camshaft position sensor; collecting the pulse signal of the engine crankshaft signal disk through a crankshaft position sensor; generating an engine crankshaft operating angle domain signal that changes with time based on the engine camshaft signal disk pulse signal and the engine crankshaft signal disk pulse signal; collecting the flywheel signal tooth pulse signal through a flywheel end sensor; generating a flywheel end angular displacement signal that changes with time based on the flywheel signal tooth pulse signal; integrating the angle domain signals and angular displacement signals at the same moment in the engine crankshaft operating angle signal that changes with time and the angular displacement signal that changes with time to obtain a torsional vibration signal that changes with the engine operating angle. The structure of the present invention is simple, realizing relatively low cost for detecting torsional vibration signals in the angle domain of the powertrain, and the signals are firm and reliable.

The present disclosure relates to an engine-motor integrated active damping control method based on principal component analysis and a motor controller. Under the premise of not significantly increasing the hardware cost of the motor controller, the damping control is sunk to the inside of the motor controller to realize engine-motor integration, actively damping by using the high bandwidth advantage of the motor controller, and significantly reducing the damping waveform storage demand and the test bench calibration workload. The present scheme reduces the damping waveform storage demand and the test bench calibration workload by storing the principal component analysis waveform and the principal component function; realizes smooth damping in a continuous working condition range through interpolation reconstruction; realizes engine-motor integration by introducing the engine crankshaft position sensor signal into the motor controller to directly obtain the engine crankshaft angle in future crankshaft angle prediction.

The invention belongs to the technical field of generator control, and relates to a non-inductive control method, system and device for a range extender generator and a medium. Signal sampling is carried out through a signal panel and a double-edge triggering mode, and a crankshaft sampling rotation angle is obtained; the starting position of crankshaft rotation is judged according to the crankshaft sampling rotation angle and a tooth missing signal in the crankshaft position signal, and the crankshaft rotation angle is recorded in real time; compensating a crankshaft rotation angle in real time through the average angular velocity and the average angular acceleration, and converting the compensated crankshaft rotation angle into an electrical angle to obtain a rotor rotation angle; and controlling the permanent magnet synchronous generator through a field-oriented control algorithm according to the rotor rotating speed and the rotor rotating angle. According to the method, the crankshaft position signal is obtained through the crankshaft position sensor, the crankshaft position signal is analyzed to obtain the rotor position information, and the problems that an existing non-inductive control method is low in precision and poor in reliability in control over the permanent magnet synchronous generator in the range extender are solved.

The invention discloses an electronic fuel injection system applied to an efficient engine and belongs to the technical field of engine electronic control. The fuel oil supply optimization module comprises a 350bar side-spraying high-pressure oil rail and a single-plunger high-pressure oil pump, the signal acquisition precision module comprises a camshaft position sensor on a valve chamber housing and a bidirectional detection Hall type crankshaft position sensor, the production maintenance module is a platform electronic throttle body, and the air-fuel ratio regulation and control module comprises an exhaust pipe linear oxygen sensor. The fault diagnosis module comprises 20-350kpa air inlet temperature pressure sensors (arranged in an air inlet manifold pressure stabilizing cavity and an intercooler air outlet chamber) and a desorption diagnosis pressure sensor; the ignition module is an ignition coil integrated with the ignition module; the structure innovation module comprises a double-end fast-insertion carbon tank control valve. All the modules are cooperatively controlled by an electronic control unit. Through collaborative optimization of all the modules, the comprehensive performance of the electronic fuel injection system of the engine is comprehensively improved, the requirement for efficient operation of the engine can be met, the production and maintenance cost can be reduced, and good application value is achieved.

The controller (110) configured to receive crankshaft position signal from a crankshaft position sensor (102) when the vehicle (100) is in motion, characterized in that, the controller (110) further configured to process the crankshaft position signal through a computational module (106), compare output of the computational module (106) with a threshold value, and determine slip in the drive wheel (114) of the vehicle (100) based on the comparison. The controller (110) is configured to monitor angular acceleration of the crankshaft instead of engine RPM, as the crankshaft undergoes different speeds within a combustion cycle based on the stroke, but engine speed would be an average of these varying speeds. The controller (110) is configured / adapted to determine the wheel slip with the crankshaft position sensor (102) by exploiting the effect of the wheel slip on the crankshaft, thus eliminating the need for wheel speed sensors and the encoder wheel assemblies.

This application relates to a variable valve timing control system and its control method, device, and equipment, belonging to the field of engine testing technology. The system includes: an engine electronic control unit (ECU), used to receive crankshaft position sensor signals and camshaft position sensor signals from the engine, determine the actual valve timing of the camshaft, and generate an oil control valve control signal based on the actual valve timing and a preset target valve timing; the oil control valve control signal is used to control the oil control valve to adjust the actual valve timing to the preset target valve timing; and a data conversion module, connected to the ECU, used to receive crankshaft position sensor signals, camshaft position sensor signals, engine motor feedback signals, and oil control valve control signals in real time, generate a motor drive signal, and transmit the motor drive signal to the motor. Using this system can reduce testing complexity.

The invention discloses a hybrid power generator vector control method and system based on a crankshaft position sensor. The method comprises the following steps: constructing a rigid coupling mapping model from a crankshaft angle to a generator electrical angle; in a first stage of starting the generator, executing vector control of the generator by taking the first estimated electrical angle as a motor rotor electrical angle; in the second stage of starting the generator, judging the size of the first estimated electrical angle; if the first estimated electrical angle meets a set condition, determining a generator electrical angle based on the crankshaft angle, and determining a motor rotor electrical angle according to the generator electrical angle to execute vector control of the generator; otherwise, vector control of the generator is performed with the first estimated electrical angle as the motor rotor electrical angle. According to the method, the rigid coupling mapping model of the crankshaft angle and the generator electrical angle is constructed, and the vector control is executed by adopting different electrical angle estimation strategies in stages, so that the hardware cost is effectively reduced while the control precision is ensured, the system reliability is improved, and the starting delay is eliminated.

This application relates to the field of automotive repair tool technology, and discloses a tooling and method for disassembling and assembling an engine crankshaft position sensor. The tooling includes a nylon block, a positioning bolt, and a ball-end hex wrench. The nylon block has a first through hole and a second through hole on its side wall. The positioning bolt passes through the first through hole, and the ball-end hex wrench passes through the second through hole. One side of the nylon block is fitted against the side of the engine housing. The central axis of the ball-end hex wrench, located inside the second through hole, is collinear with the central axis of the crankshaft position sensor fixing bolt. A positioning rubber sleeve is fitted over the ball-end hex wrench, and the positioning bolt is a hexagonal bolt. This invention improves the efficiency of disassembling and assembling the crankshaft position sensor and solves the problems of inaccurate tool alignment in narrow engine compartments with obstructed visibility, and the difficulty of applying force by hand in confined spaces, which can easily cause the fixing bolt to fall off.

A fuel sequence injection control device, comprising: an oil injector, which is internally provided with a hydraulic oil cavity; a three-position four-way proportional valve, one for each oil injector, for controlling the hydraulic oil into or discharge of the hydraulic oil cavity of the corresponding oil injector according to the received control signal, thereby controlling the up and down movement of the oil injection plunger to achieve the control of the injection time; a window valve, comprising a sensor and a multi-way valve, the sensor is used to monitor the position of the multi-way valve in real time, the multi-way valve adjusts the opening and closing state of its internal channel according to the control signal to control the hydraulic oil into or discharge of the hydraulic plunger at the top of the oil injector; a control system, which calculates the injection time of each oil injector by receiving the signal of the diesel engine crankshaft position sensor, and sends control signals to the three-position four-way proportional valve and the window valve, while receiving the feedback signal of the window valve to adjust the accuracy of the control signal, ensure the accurate control of the injection time and the injection amount, and realize the linkage adjustment of the optimal fuel consumption and emission.

The utility model discloses a crankshaft position sensor convenient to adjust, which comprises a body, a mounting seat is fixed on the body, an empty groove is arranged on one side of the mounting seat far away from the body, a fixing sleeve is arranged in the empty groove, an adjusting component is arranged on the outer side of the fixing sleeve, and the adjusting component is arranged on the outer side of the fixing sleeve. The adjusting assembly comprises guide grooves symmetrically formed in the mounting base, guide bases are slidably connected into the guide grooves, and a connecting base is fixed to the side, away from the body, of the mounting base. Through the arrangement of an empty groove, a fixing sleeve and an adjusting assembly, when the crankshaft position sensor is installed, a worker can use an adjusting lead screw in the adjusting assembly according to the position of an installation hole in a shell, and the adjusting lead screw rotates along an installation base and drives the fixing sleeve and a guide base to horizontally move along a guide groove through a connecting base; therefore, the horizontal position of the fixing sleeve is adjusted, the universality is high, use requirements are met, and practicability is improved.

The invention provides a computer-implemented method for estimating engine torque from an internal combustion engine (ICE) wherein the ICE includes a plurality of engine cylinders (14), a fuel delivery system (40) with a plurality of fuel injectors (34) arranged to selectively inject fuel in respective cylinders (14), an exhaust gas pressure sensor (64) arranged to generate a sensor signal in response to a pressure of exhaust gas from said ICE, and crankshaft position means (50.1) for generating signal(s) indicative of crankshaft (18) position within a cycle of said ICE. Injection events are performed to inject predetermined amounts of fuel via said injectors (34), in order to perform combustion events that generate torque and exhaust gas by combustion of said fuel amounts. According to the invention, the method comprises the steps of:  monitoring exhaust gas pressure over a predetermined analysis window corresponding to a combustion event in a respective cylinder (14), thereby obtaining exhaust pressure data;  processing the exhaust pressure data by computing an average pressure value of the exhaust pressure data and determining a pressure waveform from the pressure data;  feeding the average pressure value and the pressure waveform as inputs to a pre-trained neural network to output an estimated torque. A method of diagnosing an ICE is also presented that outputs an indicator of a presence or an absence of engine faults such as misfires, valve timing issues, and / or exhaust system blockages.

The invention discloses a motor signal-based motorcycle engine control method, which comprises the following steps of: turning on a power switch, starting an engine, and starting a Hall sensor on the engine to acquire a U-phase Hall signal, a V-phase Hall signal, a W-phase Hall signal and a crankshaft Hall signal; and then the U-phase Hall signal, the V-phase Hall signal, the W-phase Hall signal and the crankshaft Hall signal are input into the logic conversion module and the micro-control unit. The position of the crankshaft can be detected without a crankshaft position sensor.

Procedures for phase diagnosis, comprehensive: Performing an injection using an injector at top dead center of a compression stroke, when it is recognized that an engine position is valid, Detect (202) whether an engine is accelerating, based on a crankshaft signal detected by a crankshaft position sensor; Performing (203) an injection by means of the injector at the top dead center of an exhaust stroke when no acceleration is detected; Detect (204) whether the engine is accelerating, based on the crankshaft signal detected by the crankshaft position sensor, and; Detecting a camshaft phase deviation of 180 degrees based on a camshaft signal from a camshaft position sensor and the crankshaft signal detected by the crankshaft position sensor when acceleration is detected. including injection at top dead center of the exhaust stroke and detection of whether the engine is accelerating: the injection at the top dead center of the exhaust stroke; Detect whether the engine is accelerating; Detect (205) whether a preset number of injections has been reached when no acceleration is detected; Return to step (203) Performing an injection by means of the injector to top dead center of the exhaust stroke if the preset number of injections has not been reached; Terminate (206) injection when acceleration is detected or the injector reaches the preset number of injections.

The invention provides an automatic crankshaft position sensor detection device. The automatic crankshaft position sensor detection device structurally comprises a base, a positioning box, a vertical plate, a sliding rail and a resistance detection structure. According to the invention, on the basis that a sliding rail arranged on a vertical plate restrains a resistance detection structure, after a sensor is positioned in a positioning box, a coil of the sensor is exposed below the resistance detection structure, then the resistance detection structure pulls a vertical spring through sliding of a sliding block, and then a universal meter and a rubber block are carried to move downwards; the rubber block is inserted into the space between the sensor and the positioning box for positioning, the left and right sides of the sensor are clamped and restrained, so that the coil can be aligned with the position of the meter pen at the lower end of the universal meter, and then the bounce positioning effect of the rubber block of the universal meter structure can be combined with the clamping body of the restraining block to enable the meter pen to be in a vertical fixed state. Therefore, the effect of stably detecting the resistance can be achieved through fixed contact with the coil in a penetrating state.

The invention provides a hybrid electric vehicle engine starting control method and system. The method comprises the steps that the instantaneous change rate of the rotating speed of an engine is calculated; determining a first torque correction coefficient; calculating a first correction torque; according to the current engine rotating speed and the relation between the preset rotating speed and the subareas, the subarea where the current engine rotating speed is located is determined; calculating the engine speed average change rate of the partition where the current engine speed is located; determining a second torque correction coefficient; calculating a second correction torque; and calculating the required output torque for starting the engine to start the engine. According to the hybrid electric vehicle engine starting control method and system, the change rate of the rotating speed of the engine is controlled, and the torque of the ISG motor is adjusted; starting in different engine states can be coped with, and better vehicle NVH performance is achieved. Crankshaft position information and a crankshaft position sensor are not needed, so that the cost is saved; the system structure complexity is reduced, and the fault rate is reduced.

The invention discloses a crankshaft position sensing device of a fuel engine. The crankshaft position sensing device comprises a rotating flange, a crankshaft position sensor and an electronic control unit. A plurality of equal division points are defined on the periphery of the rotating flange, and the rotating flange is provided with a plurality of teeth and notches; the crankshaft position sensor is arranged at the sensing position of the periphery, generates a first sensing signal when directly facing the notch, and generates a second sensing signal when passing through each tooth; when the rotating flange rotates along with the crankshaft, the electronic control unit obtains the rotating angle of the crankshaft by taking the received first sensing signal as a reference time point for starting to calculate the tooth number and continuously receiving the second sensing signal of each tooth as a calculation basis, so that the fuel engine can operate normally no matter whether the crankshaft is selected to rotate forwards or reversely. The invention further provides a control method of the crankshaft position sensing device of the fuel engine.

The invention discloses a gas time-sharing gas inlet method based on crankshaft synchronizing signal control, which belongs to the technical field of internal combustion engines, and comprises a gas supply channel which is arranged independent of an air inlet channel and is used for guiding gas to a cylinder, and a gas control valve is arranged on the gas supply channel; the servo motor is connected with the gas control valve and used for driving the gas control valve to execute opening or closing action; the crankshaft position sensor is used for detecting the rotating angle of an engine crankshaft in real time and generating a crankshaft synchronizing signal; and the electronic control unit is electrically connected with the crankshaft position sensor and the servo motor, receives the crankshaft synchronizing signal, judges the real-time phase of the engine according to the crankshaft synchronizing signal, and controls the servo motor to drive the gas control valve in the air inlet stroke, so that the gas control valve is kept closed in the air valve overlapping stage of the air cylinder and is opened after the air valve overlapping stage is ended. The invention aims to fundamentally solve the problems of mixed gas escape and tempering in the valve overlap angle period, and meanwhile, the economical efficiency, the dynamic property and the emission level of the engine are improved.