128 results about "Rail pressure" patented technology

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

The 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 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 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.

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

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

The 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 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 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.

The invention discloses a device for increasing the temperature of fuel in a common rail pipe of an engine, relates to the technical field of cold starting of engines, and solves the technical problems that existing fuel heating equipment is low in heating efficiency and slow in heating speed, and cold-state fuel remaining in a connected long pipeline cannot be heated. The device comprises an electric control switch valve which is installed on a pipeline connected between a common rail pipe and a fuel coarse filter and used for controlling on-off of fuel; the temperature sensor is mounted on a pipeline connected between the pressure control valve and the electric control switch valve and is used for acquiring the real-time temperature of the fuel in the common rail pipe; and the rail pressure sensor is mounted in the common rail pipe and is used for acquiring the real-time rail pressure of the fuel in the common rail pipe. A small amount of fuel is heated, energy for heating the fuel can be saved, and the heating speed of the fuel can be increased.

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

The application provides a dual-fuel engine gas pressure control method, relates to the technical field of dual-fuel engines, and is applied to a dual-fuel engine.The dual-fuel engine comprises a diesel system and a natural gas system.The natural gas system comprises a natural gas booster pump, a natural gas filter, a high-pressure gas buffer tank and a natural gas rail.The dual-fuel engine gas pressure control method comprises the following steps: obtaining the working condition of the dual-fuel engine;controlling the natural gas booster pump and a flow metering valve according to the engine speed, the pressure value in the high-pressure gas buffer tank and the pressure value in the natural gas rail in the starting state, the load increasing condition and the load decreasing condition of the dual-fuel engine respectively;decoupling the fuel rail pressure and the gas rail pressure; and performing zoned control on the natural gas set pressure so as to reduce the natural gas pressure fluctuation, reduce the adjustment difficulty, cancel the gas pressure control module and reduce the system cost.

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

The invention discloses an HPDI dual-fuel injection control system and method based on a rail pressure signal and a neural network, and relates to the technical field of engine fuel injection control. The collected rail pressure signals are preprocessed, conversion processing of converting time domain signals into frequency domain signals is executed to obtain frequency domain characteristics, and frequency band energy in a specific frequency range is extracted; according to the HPDI dual-fuel injection control system and method based on the rail pressure signal and the neural network, the new oil injector and the abraded oil injector correspond to different initial coefficients respectively, and can well adapt to different abrasion stages of the oil injectors; meanwhile, in order to effectively solve the problem that a traditional method is poor in adaptability to complex working conditions and the dynamic state of the fuel injector, the collected rail pressure signals cover multiple working conditions such as engine idling and acceleration, the neural network model can fully learn different working condition characteristics, and the system can stably operate in complex scenes.

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

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

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

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

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

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

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

Fuel system failure and / or leak detection is disclosed for a spark-ignited combustion engine that combusts hydrogen fuel. Pressure measurements of the hydrogen fueling system are taken to determine a rail pressure error based on a differential between the commanded rail pressure and the sensed rail pressure. A hydrogen fuel system failure or leak condition is detected in response to the rail pressure error falling outside an allowable rail pressure governor error that varies based on engine speed.