727 results about "Exhaust manifold" patented technology

The invention relates to an exhaust resonance tube of a two-stroke horizontally-opposed four-cylinder piston engine, which belongs to the field of two-stroke engines and comprises an exhaust manifold, a connecting component, an exhaust manifold and a tension spring component. One end of the exhaust manifold is provided with four branch air channels, and the other end of the exhaust manifold is a main air channel where the branch air channels converge. The four branch air passages are correspondingly connected with four exhaust ports of an engine respectively, and an air outlet of the exhaust manifold main air passage is in elastic airtight connection with an air inlet of the exhaust manifold through a connecting assembly. The exhaust manifold is a return reducing pipe, sequentially comprises a thin pipe section, a first diverging pipe section, a second diverging pipe section, an expansion pipe section, a rear taper pipe section and an exhaust tail pipe section and is used for adjusting contraction and expansion of exhaust waves in the exhaust manifold, and the phenomenon of back pressure is avoided. The tension spring assembly is used for vibration decoupling between the exhaust resonance tube and the engine. The two-stroke horizontally-opposed four-cylinder piston engine solves the problems that an existing two-stroke horizontally-opposed four-cylinder piston engine for the unmanned aerial vehicle has short-circuit loss, and the power is obviously reduced within a certain rotating speed range.

The invention discloses a clamp for machining an automobile exhaust manifold, and relates to the technical field of automobile part machining. The exhaust manifold comprises a clamp mechanism and a manifold body, the manifold body comprises an exhaust main pipe, a plurality of exhaust branch pipes are fixedly installed at one end of the exhaust main pipe, a main pipe assembly disc is fixedly installed at the other end of the exhaust main pipe, and branch pipe assembly discs are fixedly installed at the other ends of the exhaust branch pipes; a plurality of assembling holes are formed in the side wall of the main pipe assembling disc and the side wall of the branch pipe assembling disc. By arranging the clamp mechanism, a manifold body is firstly taken to the top of the clamp mechanism, exhaust branch pipes are downwards connected to the multiple three-finger clamps in a sleeving mode, the three-finger clamps drive the pneumatic clamping jaws to be away from one another and clamp the manifold body from the interior, and therefore the manifold body is fixedly clamped on the clamp table; the manifold body is integrally fixed in the mode that the exhaust branch pipes are fixedly clamped, operation is easy, clamping is stable, and the exhaust main pipe can be conveniently machined.

A cell pack thermal management device suitable for use with a cell pack. The device has a plurality of flexible conduits, an intake manifold and an exhaust manifold. The plurality of flexible conduits are fluidly connectable between the intake manifold and the exhaust manifold to provide a plurality of fluid paths between the intake manifold and the exhaust manifold. At least one of the intake manifold and the exhaust manifold has a manifold body, a plurality of conduit ports adapted to fluidly mate with an inlet or the outlet port of each respective flexible conduit, and a system port. The plurality of conduits ports and the system port are fluidly connected within the manifold body by a series of channels tuned for even flow distribution.

The invention relates to the technical field of exhaust gas recirculation of engines, in particular to an engine, a vehicle and an EGR exhaust gas flow control method. The engine comprises an air cylinder, at least two exhaust manifold branches, an EGR system and a control system, the air cylinder comprises an air inlet and at least two exhaust ports, the air inlet is communicated with an air inlet manifold, the number of the exhaust manifold branches is the same as that of the exhaust ports, inlets of the exhaust manifold branches are communicated with the exhaust ports in a one-to-one correspondence mode, the EGR system comprises at least two EGR channels, and the EGR channels are communicated with the exhaust ports in a one-to-one correspondence mode. Inlets of the EGR channels communicate with the exhaust manifold branches in a one-to-one correspondence mode, an outlet of each EGR channel communicates with the intake manifold, each EGR channel is connected with the control system, and the control system is used for controlling the waste gas flow of the at least two EGR channels. According to the implementation mode, due to the fact that the opening degree of each EGR channel can be accurately controlled, the engine can achieve optimal EGR rate control under the small exhaust gas flow and the large exhaust gas flow, and therefore the fuel economy and emission consistency of the engine are improved.

The invention belongs to the technical field of clean energy, and particularly relates to an ammonia-hydrogen fusion engine system and a control method thereof.The ammonia-hydrogen fusion engine system comprises an engine, a liquid ammonia vaporization device and an ammonia reaction hydrogen production device, the engine is provided with an intake manifold and an exhaust manifold, and the exhaust manifold penetrates through the ammonia reaction hydrogen production device; the liquid ammonia vaporization device is communicated with the ammonia reaction hydrogen production device through a first pipeline and is communicated with the intake manifold through a second pipeline, and the second pipeline is communicated with the first pipeline so as to convey ammonia gas to the ammonia reaction hydrogen production device and the intake manifold respectively; and a gasoline injector is further arranged on the intake manifold, and when the water temperature of the engine is smaller than a first temperature threshold value or the temperature of a catalyst in the ammonia reaction hydrogen production device is smaller than a second temperature threshold value, the gasoline injector is used for injecting gasoline into the intake manifold so as to start the engine. The cold start problem of the engine can be solved, and the ignition reliability is improved.

The invention relates to a method for automatically detecting a blockage of a sensor duct (16) extending between an exhaust manifold (12) and a pressure sensor (14) of an internal combustion engine (10), wherein the pressure sensor is capable of recording a signal representing a relative pressure varying over time. The method comprises at least one of the following steps: a) determining an average amplitude of oscillations of the signal over a first time period while the engine is running in a steady state of operation, the sensor duct being considered blocked when the average amplitude is less than a first threshold value; b) monitoring the signal over a second time period starting from the time when the engine has been disconnected, the sensor duct being considered blocked when the integral of the signal is greater than a second threshold value.

Described herein are engine systems, closed crankcase ventilation systems, and hot filter assemblies that are configured to filter out contaminants from the closed crankcase ventilation system prior to being returned to an air intake of the engine system. In some examples, a closed crankcase ventilation system can include an engine comprising a crankcase, an oil separator coupled to the crankcase, and a hot filter assembly coupled to the oil separator and mounted to an exhaust manifold of the engine or a turbine housing of a turbocharger. The hot filter assembly comprises a housing defining a cavity, a gas inlet fluidly coupled between the oil separator and the cavity, a gas outlet fluidly coupled between the cavity and an air intake of the engine, and at least one baffle extending across the cavity and defining a first and second gas pathways on opposite sides of the baffle.

The utility model relates to a cutting bed which comprises a machine frame, and the machine frame is provided with a feeding conveying belt, a discharging conveying belt, a film covering frame, a cutting knife, a pressure maintaining structure and an adsorption system for vacuumizing materials located on the feeding conveying belt. The adsorption system comprises an exhaust fan, an air inlet structure connected to the inlet end of the exhaust fan and an exhaust manifold connected to the outlet end of the exhaust fan, and the air inlet structure comprises an air inlet main chamber with the upper end closed through the feeding end conveying belt and an air inlet pipe communicated with the air inlet main chamber and the inlet end of the exhaust fan; the pressure maintaining structure comprises a front sealing plate and a rear sealing plate, wherein the front sealing plate is used for sealing the part, located in front of the cutting knife, of the materials on the feeding conveying belt, and the rear sealing plate is used for sealing the part, located behind the cutting knife, of the materials on the feeding conveying belt. The utility model provides the cutting bed which is high in precision when the fluffy fabric is cut, and the problem that the precision is low when the fluffy fabric is cut by an existing cutting bed is solved.

The invention discloses an automobile exhaust manifold airtightness detection device, which comprises a base, a plurality of positioning assemblies, a driving device, a plurality of pressing pieces and a transmission assembly, and is characterized in that the positioning assemblies are installed at the top end of the base, and the positioning assemblies are in sealing insertion fit with the branch pipe end of a manifold body, so that the manifold body is limited in the horizontal direction; the driving device is installed at the bottom end of the base, the pressing piece is movably arranged at the top end of the base, the transmission assembly is arranged at the bottom end of the base, the input end of the transmission assembly is connected with the output end of the driving device, and the output end of the transmission assembly is connected with the pressing piece in a matched mode. The beneficial effects of the invention are that the manifold body is limited and fixed through the branch pipe end position, the outer side of the manifold body is prevented from being clamped by a clamp, missed detection caused by clamp shielding is prevented, and the detection accuracy is improved; in addition, a driving device is matched with a transmission assembly to achieve fixing actions of a plurality of pressing pieces, the manufacturing cost of the device and the complexity of a control system are reduced, and the detection clamping efficiency is improved.

According to the auxiliary positioning clamp for milling the exhaust manifold, an inclined positioning supporting device is arranged on the right side of the upper end face of a bottom plate, and when the inclined positioning supporting device is connected with a flange at the lower end of a middle pipe of the exhaust manifold in a matched mode, an upper end pipe of the exhaust manifold is in a horizontal state, and a pipe opening in the elbow end of the upper end of the exhaust manifold is parallel to the corresponding side wall face of the bottom plate; the left side of the upper end face of the bottom plate is provided with a positioning and supporting assembly used for supporting the elbow end of the upper end of the exhaust manifold and determining the center position of a pipe opening, and the positioning and supporting assembly is matched with a pressing assembly arranged on the upper end face of the bottom plate to fixedly support the elbow end of the upper end of the exhaust manifold on the bottom plate. Initial positioning conditions are provided for the center of a pipe opening of the upper end pipe of the exhaust manifold, reliable supporting and fixing of the exhaust manifold on the bottom plate are achieved, the defect that a traditional clamp is high in requirement for machining equipment is overcome, machining cost is reduced, the exhaust manifold can be accurately and rapidly positioned and clamped, production cost is reduced, and the machining efficiency is improved. Equipment limitation is eliminated, and the production requirements of parts are met.

The invention provides a multi-cylinder engine same-frequency out-phase pulse simulation test system. The multi-cylinder engine same-frequency out-phase pulse simulation test system comprises a turbocharger to be tested, an exhaust manifold, a single-source pulse generator and an air inlet pipe. An air inlet of the single-source pulse generator is connected with an external air source through an air inlet pipe, the single-source pulse generator is provided with a plurality of air outlets, and the plurality of air outlets are connected with an air inlet of a turbocharger to be tested through an exhaust manifold; the single-source pulse generator is connected to the driving adjusting device, the driving adjusting device drives the single-source pulse generator to output same-frequency out-phase pulse airflow, and the single-source pulse generator is used for simulating the air inlet condition of an engine exhaust manifold in the exhaust state of the engine so as to simulate the operation state of the turbocharger to be tested on a rack in the exhaust state of the engine. The multi-cylinder engine same-frequency out-of-phase pulse simulation test system simulates the real mixing state of multi-strand out-of-phase pulse exhaust at the downstream of the exhaust port of the engine, so that rack simulation of the same-frequency out-of-phase pulse exhaust state of the engine is realized.

The utility model discloses an exhaust manifold with a novel structure, and relates to the technical field of exhaust manifolds. The exhaust manifold comprises an exhaust manifold body, a shell mechanism is arranged on the exhaust manifold body and comprises an upper connecting piece, a lower connecting piece, a left connecting piece and a right connecting piece, an upper shielding pipe is arranged between the upper connecting piece and the left connecting piece, and a lower shielding pipe is arranged between the lower connecting piece and the right connecting piece. By arranging the exhaust manifold, the shell mechanism and the components in the shell mechanism, the exhaust manifold can be directly wrapped in the shell mechanism through the exhaust manifold and the shell mechanism, so that obvious black traces can be formed on the inner wall of the shell mechanism through sprayed gas when a crack is generated; therefore, a user or a maintainer is helped to quickly and accurately position the crack, the amount of powder sprayed outwards can be reduced, and pollution to the periphery is reduced.

The utility model relates to the technical field of hydrogen internal combustion engines, in particular to a device for increasing tail gas temperature of a hydrogen internal combustion engine and enhancing pressurization. Comprising the steps that an exhaust hydrogen combustion device and an electronic control unit are additionally arranged on an original exhaust manifold of an internal combustion engine, an auxiliary combustion chamber is installed on the upstream of a turbocharger, the oxygen exhaust flow is calculated through an exhaust flow sensor and an oxygen concentration sensor, the hydrogen spraying flow of a hydrogen nozzle is determined, and hydrogen-air mixed gas is ignited through a sparking plug; therefore, the tail gas enthalpy value of an inlet of the turbocharger is increased through combustion of hydrogen in the auxiliary combustion chamber, the supercharge ratio is increased, and then the inflation efficiency and the power density of the hydrogen internal combustion engine are improved.

The invention relates to the technical field of hydrogen internal combustion engines, in particular to a device for increasing the tail gas temperature of a hydrogen internal combustion engine and enhancing pressurization and a control method thereof. Comprising the steps that an exhaust hydrogen combustion device and an electronic control unit are additionally arranged on an original exhaust manifold of an internal combustion engine, an auxiliary combustion chamber is installed on the upstream of a turbocharger, the oxygen exhaust flow is calculated through an exhaust flow sensor and an oxygen concentration sensor, the hydrogen spraying flow of a hydrogen nozzle is determined, and hydrogen-air mixed gas is ignited through a sparking plug; therefore, the tail gas enthalpy value of an inlet of the turbocharger is increased through combustion of hydrogen in the auxiliary combustion chamber, the supercharge ratio is increased, and then the inflation efficiency and the power density of the hydrogen internal combustion engine are improved.

The invention discloses a hot EGR flow calculation method and device, an engine and a vehicle. The calculation method comprises the steps that a flow conservation equation of the hot EGR flow is established according to flow conservation; the operation condition of the engine is obtained, and the EGR flow direction is determined according to the operation condition; a corresponding flow conservation equation is solved according to the EGR flow direction, and the initial hot EGR flow is determined; the pressure ratio of the engine is obtained, the initial hot EGR flow is corrected according to the pressure ratio, and the hot EGR flow is obtained; the pressure ratio is a ratio of exhaust manifold pressure to intake manifold pressure or a ratio of exhaust manifold pressure to turbine outlet pressure. According to the technical scheme, the initial hot EGR flow is determined by establishing the mass conservation equation during EGR forward flow and reverse flow and combining the EGR flow direction, the initial hot EGR flow is corrected through the pressure ratio of the engine, the hot EGR flow is obtained, model calculation is used for replacing a hot EGR flow sensor, and the application range of hot EGR is widened.

The invention discloses a hybrid locomotive power battery thermal guarantee control method and system, and the method comprises the steps: a control unit is configured to obtain first working condition data of an internal combustion engine, and generates a predicted preheating generation amount according to the first working condition data; acquiring second working condition data of the power battery system, and generating predicted power battery system consumption according to the second working condition data; generating a control instruction according to the predicted preheating generation amount and the predicted power battery system consumption, wherein the control instruction is used for determining the output heat of the waste heat recovery unit and the output heat or storage heat of the heat storage unit; the waste heat recovery unit is integrally arranged on an exhaust manifold of the internal combustion engine and makes contact with a cooling circulation pipeline of the power battery system and the heat storage unit. The heat storage unit is further in contact with the cooling circulation pipeline.

The invention relates to a silicon-molybdenum-vanadium nodular cast iron material and a preparation method and application thereof. The silicon-molybdenum-vanadium nodular cast iron material comprises the following components in percentage by mass: 2.9-3.4% of C; 3.9% to 4.3% of Si; mn: 0.1%-0.3%; less than or equal to 0.05% of P; s: less than or equal to 0.02%; 0.03% to 0.055% of Mg; 0.9% to 1.15% of Mo; 0.25% to 0.45% of V; cr: 0.1% to 0.25%; 0.008%-0.02% of RE (rare earth); and the balance of Fe and inevitable impurities. The tensile strength of the material at the temperature of 800 DEG C is 60-65 MPa, the ductility of the material at the temperature of 800 DEG C is 30%-45%, the linear expansion coefficient of the material at the temperature of 800 DEG C is 16-19 micrometers / (m.K), the material is low in cost, and the risk that the exhaust manifold of the heavy-duty engine loses efficacy and cracks under extreme conditions can be reduced.

A system for an electrically powered aircraft can comprise: a truss configured to couple to a structure of an aircraft; a battery system supported by the truss, the battery system including a first array of battery modules and a second array of battery modules, the first array of battery modules operably coupled to the second array of battery modules: and an exhaust system including a first exhaust manifold, a second exhaust manifold, and a common exhaust manifold, the first exhaust manifold coupled to each battery module in the first array of battery modules, the second exhaust manifold coupled to each battery module in the second array of battery modules, and the first exhaust manifold and the second exhaust manifold each coupled to the common exhaust manifold.

The tail gas purification complete equipment applied to the gas turbine relates to the technical field of tail gas purification, and is characterized in that the tail gas purification complete equipment comprises a gas inlet pipe, a purification cylinder body is arranged on the right side surface of the gas inlet pipe, and a stainless steel packaging plate is arranged on the outer surface of the purification cylinder body; an exhaust manifold is arranged on the right side surface of the air inlet pipe, and sensor frames are arranged on the outer surfaces of the exhaust manifold and the air inlet pipe; the purification barrel comprises a purification barrel body, a first stainless steel packaging ring and a second stainless steel packaging ring, the first stainless steel packaging ring is installed on the inner wall of the purification barrel body, and a first purifier carrier and a second purifier carrier are sequentially installed in the purification barrel body from left to right. In order to solve the problem of large effective reaction volume of the corresponding tail gas purification device, the purification barrel body is provided with a continuous oxidation reaction device, so that the self-cleaning function of the purification equipment is achieved.

The utility model discloses an air inlet structure of a three-way catalyst, and belongs to the technical field of air inlet structures of three-way catalysts. The three-way catalytic converter comprises a three-way catalytic converter body, an air inlet end cone is communicated with the three-way catalytic converter body, an installation cylinder is arranged in the air inlet end cone, a circular ring is installed at one end of the installation cylinder, a filter screen is installed at the other end of the installation cylinder, and the filter screen is arranged in the air inlet end cone. According to the three-way catalytic converter, the installation cylinder is sleeved with the air inlet end cone, the installation cylinder and the circular ring form a whole, the filter screen at one end of the installation cylinder can intercept and filter impurities in flowing-in waste gas, the waste gas catalytic efficiency of the three-way catalytic converter is improved, the air inlet end cone, the three-way catalytic converter body and the exhaust manifold can be separated from an external waste gas conveying pipeline, and therefore the waste gas can be discharged conveniently. The circular ring and the cylinder are separated from the interiors of the clamping groove and the circular hole, so that a user conveniently takes the circular ring to drive the mounting barrel to be taken out from the interior of the air inlet end cone, and the filter screen is conveniently cleaned.

The exhaust manifold for the engine comprises an exhaust pipe main channel with a hollow cavity, and a plurality of exhaust connectors communicated with an engine cylinder are connected to the exhaust pipe main channel; the multiple exhaust connectors are sequentially arranged in the axial direction of the exhaust pipe main channel, each exhaust connector is fixedly communicated with the hollow cavity of the exhaust pipe main channel through a fixing structure, the short exhaust connectors are stably connected with an engine, the exhaust manifold component is prevented from swinging, and the service life of the exhaust manifold component is prolonged. The anti-vibration performance of the exhaust manifold is greatly improved, the exhaust working stability and the exhaust efficiency of the exhaust manifold are improved, and the technical problem that an existing engine exhaust manifold cannot be applied to mine equipment engines with large vibration is solved.

The utility model relates to a misfire diagnosis system for a marine gas engine, and relates to the technical field of monitoring of marine gas engines, the misfire diagnosis system comprises an engine exhaust header pressure sensor and an engine electronic control unit, the engine exhaust header pressure sensor is arranged on an exhaust pipe of the engine and is used for collecting exhaust pressure waveform data in real time, and the engine electronic control unit is used for monitoring the exhaust pressure waveform data; the engine electronic control unit receives pressure waveform data from the engine exhaust manifold pressure sensor. According to the misfire detection system for the marine fuel engine, the exhaust header pressure wave signal is selected as a signal source, engine misfire monitoring and diagnosis can be carried out, and the requirement for stable operation of the marine engine is met.

The application relates to the technical field of investment casting and discloses an exhaust manifold investment casting equipment based on a hierarchical cooling shaping structure, which comprises a mold group, a main pipe core-pulling module and a branch pipe core-pulling module, the inside of the mold group is provided with a mold cavity, and the inside of the mold group is provided with a cooling pipeline; wherein the main pipe core-pulling module comprises a sliding block one, and the side close to the mold group of the sliding block one is fixedly installed with a core-pulling block. The exhaust manifold investment casting equipment based on the hierarchical cooling shaping structure can effectively solve the problem that, in the prior art, the conventional investment casting wax injection mold usually adopts an integral fixed core-pulling structure, and when the core-pulling is performed on the main pipe end of the exhaust manifold, due to the complex inner cavity curved surface at the intersection of the main pipe and the branch pipe of the exhaust manifold, the diameter of the arc connection at the intersection is greater than the diameter of the outer end of the main pipe, the contact area between the core body of the existing core-pulling structure and the inner wall of the wax mold is large, the friction force is strong, and the inner wall of the wax mold is prone to scratching, pilling and even tearing.

A combustion engine arrangement comprising a combustion engine has an intake manifold, and an exhaust manifold the combustion engine arrangement comprising a turbocharged air intake system fluidly connected to said intake manifold. The turbocharged air intake system has an air pump; and an exhaust gas recirculation (EGR) system fluidly connecting said exhaust manifold to said intake manifold, the EGR system comprising an EGR pump. The EGR pump and the air pump are arranged to be independently controllable so as to enable independent control the exhaust gas inflow and the air inflow to the intake manifold of the combustion engine.

An internal combustion engine includes a cylinder head with an exhaust manifold configured to supply exhaust gas through a main exhaust outlet to a main exhaust aftertreatment system having a main catalytic converter, a bypass passage in fluid communication with the exhaust manifold via a bypass port, a bypass catalytic converter disposed within the bypass passage, and a dual-acting valve assembly configured to move between a first position that seals the bypass port, and a second position that seals the main exhaust outlet. During cold start, long idle, and / or low main catalytic converter temperature conditions, the dual-active valve assembly is moved to the second position to direct exhaust flow through the bypass passage and the bypass catalytic converter to reduce emissions.

An internal combustion engine includes a cylinder head with an exhaust manifold coupled to the cylinder head and a turbocharger coupled to the exhaust manifold. The exhaust manifold comprises one or more exhaust passages in fluid receiving communication with one or more cylinders of the internal combustion engine. The exhaust manifold further comprises a flange having one or more openings in fluid receiving communication with the one or more exhaust passages. The openings are configured to increase thermomechanical failure life in the exhaust manifold flange.

An integrated catalyst reformer is described, including a housing which surrounds and defines at least two individualized and adjacent chambers. The first chamber is intended for the catalytic conversion of exhaust gases from the MCI and at least one second chamber intended for reforming fuel, ethanol or others, and the heat generated in the first chamber is transferred to the second chamber by thermal conduction. The first chamber is connected, upstream, to the exhaust manifold of the MCI from the inlet nozzle and is connected to the exhaust of the vehicle from the outlet nozzle, while the plenum of the first chamber is filled with a catalytic mesh. The second chamber includes a plenum filled with a catalytic mesh; an intake nozzle intended to receive both ambient air and the fuel to be reformed; and an exhaust nozzle, connected upstream of the intake manifold, so as to allow the reformed fuel to be aspirated.

The application provides a turbocharger high-pressure exhaust variable position introduction system and method. The system comprises a turbocharger, a compressor and an exhaust turbine, an exhaust end of the exhaust turbine is communicated with an exhaust end of an exhaust manifold, and an exhaust end of the compressor is communicated with an air intake end of an air intake manifold; a first introduction pipeline, an exhaust end of which is communicated with the air intake end of the air intake manifold; a second introduction pipeline, an exhaust end of which is communicated with the air intake end of the compressor; a shunt bypass, an air intake end of which is connected to a pipeline section between the exhaust end of the exhaust manifold and the air intake end of the exhaust turbine; and a controllable electromagnetic three-way valve, an air intake port of which is arranged on the shunt bypass, a first air outlet of which is connected with the air intake end of the first introduction pipeline, and a second air outlet of which is connected with the air intake end of the second introduction pipeline.

Embodiments are disclosed herein for detecting deterioration of a connecting rod large end bearing within an internal combustion engine including a crankshaft and an exhaust manifold, the internal combustion engine incorporated on a vehicle. A method includes providing an electronic control unit coupled to an engine, a first set of sensors positioned adjacent to a crankshaft for detecting crankshaft acceleration, a second set of sensors positioned adjacent to an engine exhaust manifold for detecting engine exhaust manifold pressure, and a display component and an auditory component coupled to the electronic control unit. The display component and / or the hearing component is activated when the first set of sensors detects that the crankshaft acceleration during the power stroke is reduced compared to a previous acceleration of the crankshaft during the power stroke, and the second set of sensors detects that the exhaust manifold pressure does not statistically differ from the expected exhaust manifold pressure.

The invention discloses a method and device for estimating residual waste gas in a cylinder of a hydrogen combustion range extender, a vehicle and a medium, and relates to the technical field of vehicle engines, and the method comprises the steps: building a waste gas flow model at an exhaust valve based on engine structure parameters, a pressure signal and a temperature signal of an exhaust manifold, and exhaust efficiency; on the basis of the inlet waste gas flow of the exhaust manifold and the outlet waste gas flow of the exhaust manifold, according to the mass conservation relation and the ideal gas state equation, an exhaust pressure average value discrete dynamic model of the exhaust manifold is built; constructing a self-adaptive observer based on an exhaust pressure average discrete dynamic model, and estimating the exhaust efficiency; according to the online estimation result of the exhaust efficiency, the mass of exhaust gas exhausted in each cycle is obtained, and the amount of residual exhaust gas in the cylinder is calculated. By adopting the method, the mass of exhaust gas in each cycle and the amount of residual exhaust gas in the cylinder can be accurately estimated in real time in the actual vehicle running process, so that reliable reference is provided for combustion control and emission optimization.