1378results about "Exhaust gas recirculation" patented technology

A cooling system for vehicles and a control method thereof improves indoor heating performance and fuel efficiency by controlling a flow rate of a coolant passing through a heater core together with an EGR cooler. A coolant having an increased temperature is first supplied to the heater core side through a flow stagnancy control to rapidly increase the temperature of the coolant flowing in the heater core, thereby improving heating performance. A warm-up feature is improved through an exhaust heat recovery function by a heat exchange between the exhaust gas and the coolant in the EGR cooler, thereby improving efficiency of fuel.

An exhaust gas recirculation mixer according to certain embodiments is operable to receive a first fluid via a first fluid intake and to receive a second fluid via a second fluid intake. One of the first fluid or the second fluid comprises air, and the other of the first fluid or the second fluid comprises exhaust gas. The exhaust gas recirculation mixer generally includes a plurality of mixing passages and a plurality of multi-path nozzles. Each mixing passage includes a corresponding and respective throat. Each multi-path nozzle generally includes an outer nozzle fluidically connected to the first fluid intake, and an inner nozzle fluidically connected to the second fluid intake. The inner nozzle is nested within the outer nozzle and projects into the throat of a corresponding and respective mixing passage.

The invention discloses an engine EGR system, a control method and a vehicle. The engine EGR system comprises a turbocharger, a first valve, an electric compressor, an intercooler, an EGR cooler and at least one air cylinder. The exhaust end of the air compression assembly is connected with the first end of the intercooler, and the second end of the intercooler is connected with the air inlet end of the air cylinder. The first end of the first valve is connected with the exhaust end of the air compression assembly, the second end of the first valve is connected with the second end of the EGR cooler, the third end of the first valve is connected with the first end of the electric air compressor, and the second end of the electric air compressor is connected with the intercooler; air enters through the air inlet end of the air compression assembly, and the first valve controls the intervention condition of the electric air compressor by adjusting the opening degree of the first valve. Air passes through the intercooler and the air cylinder to generate waste gas, and at least part of the waste gas flows into the turbine assembly and is exhausted. According to the engine EGR system provided by the invention, the intervention condition of the electric gas compressor is controlled through the action of the first valve, so that the purpose of adapting to multiple working conditions and multiple scenes is achieved.

The invention discloses an anti-icing method for an engine air inlet system, the engine air inlet system and a vehicle, and belongs to the technical field of engines. According to the anti-icing method for the engine air inlet system, the engine air inlet system and the vehicle, when the engine is in low-temperature cold start, the water vapor content in the engine air inlet system is reduced by reducing the torque of the engine; and / or the speed of the vehicle is reduced, so that the situation that the temperature of cooling liquid in a water jacket of the engine rises too slowly due to the fact that the vehicle purges the engine windward is avoided; when the temperature of the cooling liquid in the water jacket of the engine is low, adverse factors causing icing of an air inlet system of the engine are weakened, and the icing risk is reduced; when the temperature of the engine is too low, the temperature of the cooling liquid in the water jacket of the engine is high, the EGR mixer and the air inlet mixer are heated through waste heat of the engine, the problem that water separated out of high-temperature waste gas is frozen is solved, the purpose of preventing freezing can be achieved, cost is low, and system robustness is high.

The invention discloses a detection and calibration device and method for clamping stagnation of an EGR (Exhaust Gas Recirculation) valve, and the method comprises the steps: firstly, dismounting the EGR valve of an engine, and dismounting the EGR valve into an actuator and a valve body; the first component is installed on the original installation face, in butt joint with the valve body, of the actuator, and the distance between the plane at one end of a push rod of the actuator and the installation plane of the actuator is adjusted and fixed to any numerical value; the second component is installed on the original installation face, where the actuator is installed, of the valve body, and the distance between the end face, connected with the bowl body, of the adjusting bolt unit and the installation face of the valve body is adjusted to be equal to the distance between the plane at one end of a push rod of the actuator and the installation plane of the actuator; and then detection is carried out according to an EGR valve clamping stagnation fault test method. According to the detection and calibration device and method for clamping stagnation of the EGR valve, the EGR valve cannot be damaged in the EGR valve detection process, and clamping stagnation faults can be set randomly in the stroke of the EGR valve.

The invention discloses a method for actively regulating and controlling the temperature of an exhaust pipe under the sliding working condition of an engine, and relates to the engine control technology, the current working condition of the engine is recognized, and if the current working condition is the sliding working condition, an exhaust temperature increasing regulation and control mode is started; according to the exhaust temperature increasing regulation and control mode, a temperature rise demand target is calculated according to the temperature difference value between the current exhaust temperature of an exhaust pipe of the engine and the set target exhaust temperature, and a temperature rise control strategy is selected according to the temperature rise demand target and executed. The invention further discloses a system for actively regulating and controlling the temperature of the exhaust pipe under the engine sliding working condition. The exhaust temperature in the sliding process is increased, the cold and hot temperature difference of the exhaust pipe is reduced, and therefore the reliability of the exhaust pipe is improved.

According to certain embodiments, a method generally involves mixing exhaust gas and air in an exhaust gas recirculation mixer. The method includes directing exhaust gas from the engine to the mixing tube along a first flow path, and directing air to the mixing tube along a second flow path. One of the first flow path or the second flow path is an outer flow path, and the other of the first flow path or the second flow path is an inner flow path surrounded by the outer flow path. The first flow path and the second flow path merge within the throat of the mixing tube such that the exhaust gas and the air mix within the mixing tube to provide a mixture of the exhaust gas and the air.

A system, method, and apparatus for zero or low NOx emissions during a certain operating period are provided. A system can include an aftertreatment system including a catalyst. The system can include a pump coupled to at least an intake of an engine and an exhaust of the engine. The system can include a heater positioned downstream of the engine. The system can further include a controller coupled to at least the aftertreatment system. the pump, and the heater. During a warmup period for the aftertreatment system. the controller is configured to maintain the engine in an off state. initiate the heater to increase a temperature of the aftertreatment system while the engine is in the off state. and control the pump to generate an airflow directed from the intake to the heater to increase the temperature of the aftertreatment system.

The present invention discloses a closed-loop EGR flow control system and control method for a natural gas engine. The control system includes: a controller for determining an EGR demand flow rate based on actual engine operating conditions; a controller for obtaining the pressure of an air and gas mixture detected by an intake pressure sensor; or, alternatively, for determining the pressure of an air and gas mixture based on the EGR demand flow rate, a threshold flow rate, the maximum opening of an EGR valve, the actual opening of the EGR valve, the gas flow rate, and the fresh air flow rate; a controller for determining an actual EGR flow rate based on the obtained pressure of the air and gas mixture, the partial pressure of gases in the cylinder, the pressure-to-flow conversion slope, the gas flow rate, and the fresh air flow rate; a controller for determining an EGR flow rate correction value based on the obtained actual EGR flow rate and the EGR demand flow rate; and a controller for adjusting the EGR valve opening based on the EGR flow rate correction value so that the actual EGR flow rate matches the EGR demand flow rate, thereby achieving closed-loop control of the EGR flow rate. The present invention can achieve precise control of the EGR flow rate in two ways.

An anti-clamping stagnation EGR valve with a sealing structure is characterized in that a valve rod sub-assembly is arranged in a valve body, the valve rod sub-assembly comprises a valve rod body, a valve rod channel is formed in the valve body, the valve rod body is located in the valve rod channel, a flexible protective sleeve assembly is arranged on the valve rod body, and the flexible protective sleeve assembly comprises an inner protective sleeve, a rubber sleeve body and an outer baffle; the valve rod body penetrates through the center of the inner sheath, the center of the rubber sleeve body and the center of the outer baffle, the inner sheath is connected to the inner end of the rubber sleeve body, and the outer baffle is connected to the outer end of the rubber sleeve body. The outer baffle is in interference fit with the valve rod body; a plurality of sealing bulges are formed on the rubber sleeve body; the gap between the inner wall of the valve rod channel and the valve rod body is sealed through the sealing protrusion so that particulate matter / corrosives can be prevented from penetrating through the gap. Waste gas can be prevented from leaking along the valve rod body to the maximum extent, valve body sealing is achieved, a gas channel is isolated, particulate matter or corrosives are prevented from being accumulated in a gap between the valve rod body and the guide sleeve, carbon deposition is reduced, and the service life is prolonged.

The present invention provides a device and method for controlling the intake air temperature of a methanol compression ignition engine, belonging to the field of engine technology. The control device includes: an intercooler disposed on an intercooler circuit, the intercooler circuit being provided with a first valve; an intercooler bypass branch being provided with a second valve; an EGR cooler disposed on the EGR circuit, the EGR circuit being provided with a third valve and a fifth valve; an EGR bypass branch being provided with a fourth valve; and a controller for controlling one of the first and second valves to open and the other to close under cold start conditions or preset low-load conditions, adjusting the opening of the fourth valve based on an intake air temperature target value, and controlling the third and fifth valves to close. By providing an intercooler bypass, the present invention solves the problem that existing methanol compression ignition engines cannot achieve stable cold start ignition, sustained stable ignition, and stable combustion when burning pure methanol fuel in a low-temperature environment.

An exhaust gas recirculation mixer according to certain embodiments includes a chamber through which a first fluid is operable to flow in a downstream direction toward a mixing passage. The chamber is fluidically connected with the mixing passage via a first nozzle, and the mixing passage extends along a longitudinal axis defining the downstream direction and an upstream direction opposite the downstream direction. The exhaust gas recirculation mixer further includes a second nozzle and a fuel nozzle. The second nozzle extends into the mixing passage and is configured to direct a second fluid toward the mixing passage. The second nozzle comprises a second nozzle outlet portion circumferentially surrounded by the first nozzle. The fuel nozzle comprises a fuel nozzle outlet portion configured to inject fuel into the chamber in a fuel injection direction, and the fuel nozzle outlet portion is positioned upstream of the first nozzle.

A sealing mechanism for a rotating mechanism, a rotating mechanism and a sealing method. The rotating mechanism comprises a rotor having a rotary disk (1) and a stator accommodating the rotor. The sealing mechanism comprises a first flow-blocking portion (4), which protrudes and is provided on an end face of the rotary disk (1), wherein a labyrinth seal and a spiral seal are provided in combination at the first flow-blocking portion (4); and a first corresponding flow-blocking portion (5), which is recessed, is provided on an inner surface of the stator and is in clearance fit with the first flow-blocking portion (4). The first flow-blocking portion (4) has a first recessed portion and / or protruding portion (6) on a circumferential surface thereof, the first corresponding flow-blocking portion (5) is flatly constructed or provided, on a circumferential surface thereof, with a first corresponding protruding portion and / or recessed portion (7) which are / is in clearance fit with the first recessed portion and / or protruding portion (6), and the first flow-blocking portion (4) and the first corresponding flow-blocking portion (5) form a labyrinth seal at the corresponding top or bottom section thereof respectively and form a spiral seal at a corresponding side section respectively, which can further suppress fluid leakage, thereby improving the sealing performance.

A method according to certain embodiments generally involves mixing exhaust gas and air in an exhaust gas recirculation mixer. The method includes directing exhaust gas from an engine to a mixing tube along a first flow path, and directing air to the mixing tube along a second flow path. One of the first flow path or the second flow path is an outer flow path, and the other of the first flow path or the second flow path is an inner flow path surrounded by the outer flow path. The first flow path and the second flow path merge within a throat of the mixing tube such that the exhaust gas and the air mix within the mixing tube to thereby provide a mixture of exhaust gas and air.

This exhaust gas processing equipment is provided with an exhaust line through which exhaust gas discharged from a boiler circulates, a carbon dioxide recovering device for recovering carbon dioxide included in the exhaust gas, and an exhaust gas heating device provided downstream of the carbon dioxide recovering device to heat the exhaust gas. The carbon dioxide recovering device includes a first medium line through which a first medium circulates, and a second medium line through which a second medium higher in temperature than the first medium circulates. The exhaust gas heating device includes a first heating unit for heating the exhaust gas by means of heat exchange with the first medium, and a second heating unit for heating the exhaust gas passing through the first heating unit even more by heat exchange with the second medium.

A method according to certain embodiments generally involves mixing exhaust gas and air in an exhaust gas recirculation mixer. The method includes directing exhaust gas from an engine to a mixing tube along a first flow path, and directing air to the mixing tube along a second flow path. One of the first flow path or the second flow path is an outer flow path, and the other of the first flow path or the second flow path is an inner flow path surrounded by the outer flow path. The first flow path and the second flow path merge within a throat of the mixing tube such that the exhaust gas and the air mix within the mixing tube to thereby provide a mixture of exhaust gas and air.

The application discloses a system and method for realizing and improving engine EGR rate, which comprises an ECU of an engine, an exhaust pipe and an air inlet pipe connected to the engine, the exhaust pipe and the air inlet pipe being connected to an EGR valve, and a mixed gas pipe being further connected to the EGR valve, wherein the ECU is provided with a pressure difference obtaining unit capable of obtaining a pressure difference, and the exhaust pipe is further provided with an electrically-controlled supercharging device capable of supercharging exhaust gas in the exhaust pipe. The system for realizing and improving engine EGR rate has the structure, when the obtained pressure difference W is less than or equal to zero, and the set value of the EGR rate under the current working condition in the storage unit is greater than zero, the electrically-controlled supercharging device is started to supercharge the exhaust gas until the actual value of the actual EGR rate is equal to the set value of the EGR rate under the current working condition. The application has the advantages that the intake pressure of the exhaust gas is adjusted in real time to ensure the proportion of the exhaust gas and fresh air, and the EGR rate of the engine and the performance of the engine are ensured in real time.

This system allows for early detection of whether or not a foreign object has become lodged in the EGR valve. [Solution] The vehicle control device controls a vehicle that has an internal combustion engine and an EGR valve and performs idle stop when idle stop conditions are met. The vehicle control device comprises a drive command detection unit that detects a command value of the driving torque, a valve control unit that controls the EGR valve, an opening degree detection unit that detects the opening degree of the EGR valve, a jamming determination unit that determines whether or not a foreign object is jammed in the EGR valve based on the opening degree, and an idle stop control unit that permits or prohibits idle stop. The control device controls the EGR valve to close when the command value satisfies a first condition, determines whether or not a jamming condition exists when the command value satisfies a first condition, and permits or prohibits idle stop according to the jamming determination result when idle stop conditions are met, including the command value satisfying a second condition.

Provided is a shell type needle roller bearing having rocking durability. In this shell type needle roller bearing (10), a shell-shaped outer ring (1) is made from an austenitic stainless steel material, and the average crystal grain size in a region up to 0.135 mm from a surface of a raceway surface (1d) of the shell-shaped outer ring (1) is 22 μm or less .

To provide an EGR system capable of suppressing accumulation of PMs and an unburned HC constituent on an inner wall of an EGR cooler, and a vehicle.SOLUTION: An EGR system 12 includes: an EGR flow passage 21 connecting a secondary side and a primary side of an internal combustion engine 11; an EGR cooler 22 that is provided in the EGR flow passage 21 and in which part of exhaust gas of the internal combustion engine 11 flows; a tank 23 connected to the EGR flow passage 21 on the primary side of the EGR cooler 22 and storing compressed air; and a control section 18 that opens a valve 26 when an operating condition of the internal combustion engine 11 is a predetermined operating condition that is an operating condition where a concentration of PMs and / or unburned HC included in exhaust gas of the internal combustion engine 11 increases.SELECTED DRAWING: Figure 2

The invention relates to the field of engine intake and exhaust system control, in particular to an EGR system control method, a vehicle, electronic equipment and a storage medium. The EGR system comprises an EGR waste gas temperature adjusting unit and an EGR valve, wherein the EGR waste gas temperature adjusting unit is connected with the EGR valve through a pipeline; the EGR system control method comprises the steps that the condensation temperature threshold value of temperature-adjusted waste gas is obtained, and the temperature-adjusted waste gas is waste gas exhausted by an engine with the temperature adjusted through an EGR waste gas temperature adjusting unit; determining the condensation risk degree of the temperature-adjusted waste gas based on the condensation temperature threshold value and the temperature of the temperature-adjusted waste gas; if the condensation risk degree belongs to the first condensation risk grade, the cooling degree of waste gas exhausted by the engine is lowered through an EGR waste gas temperature adjusting unit; if the condensation risk degree belongs to a second condensation risk level, the opening degree of the EGR valve is controlled to be reduced; wherein the second condensation risk grade is higher than the first condensation risk grade. According to the method, generation of condensate water can be accurately prevented, and the high EGR rate is guaranteed as much as possible.

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.

The application belongs to the technical field of engines and discloses an engine EGR pipeline. The first pipeline and the second pipeline are parallel to each other, the first pipeline is wavy, the first channel and the second channel in the first pipeline are alternately connected, the second pipeline is wavy, the third channel and the fourth channel in the second pipeline are alternately connected, the first auxiliary pipeline is connected at the wave trough where the first channel and the second channel meet, the first auxiliary pipeline extends along the first channel and communicates with the fourth channel, and the other end of the first auxiliary pipeline is bent towards the second pipeline; the second auxiliary pipeline is connected at the wave peak where the third channel and the fourth channel meet, the second auxiliary pipeline extends along the fourth channel and communicates with the first channel, and the other end of the second auxiliary pipeline is bent towards the first pipeline; the problem that the valve plate of the one-way valve is broken under impact in the prior art, resulting in the problem of engine cylinder pulling, is solved.

A method (200) for controlling the temperature of recirculated exhaust gas in an internal combustion engine, comprising: Operating (202) the internal combustion engine (10) in a baseline mode; Receiving (204) a signal indicating the operating temperature of a motor; (206) comparing the engine operating temperature with a predetermined IEGR threshold; if the engine operating temperature is lower than the predetermined IEGR threshold, (210) activating an IEGR mode in which internal exhaust gas recirculation is present, and activating an EEVO mode, which is an operating mode of the internal combustion engine in which exhaust valve timing is changed compared to an initial operating mode; and If the engine operating temperature is higher than the first preset IEGR threshold, the IEGR mode is deactivated and the EEVO mode is deactivated. wherein the baseline mode includes activating a primary exhaust valve opening during an exhaust event of the associated cylinder of the exhaust valve, wherein the IEGR modes include activating a secondary exhaust valve opening during an intake event of the associated cylinder of the exhaust valve and partially holding the exhaust valve (64) open between the primary exhaust valve opening and the secondary exhaust valve opening, wherein the exhaust valve (64) is fully open during the primary exhaust valve opening and the exhaust valve has less than 40% of its full opening during the secondary exhaust valve opening, including the EEVO modes: Activating the primary exhaust valve opening prior to the primary exhaust valve opening of the baseline; holding the exhaust valve fully open (64); and Closing the outlet valve (64) according to the baseline mode.

An exhaust-gas turbocharger arrangement, including: three exhaust-gas turbochargers, for being arranged above an engine top side, being a high-pressure exhaust-gas turbocharger, a first low-pressure exhaust-gas turbocharger, and a second low-pressure exhaust-gas turbocharger; a high-pressure stage, with the high-pressure exhaust-gas turbocharger; a low-pressure stage, with the first and second low-pressure exhaust-gas turbochargers; and an exhaust-gas conduit, which includes a high-pressure conduit, a low-pressure conduit, and a high-pressure stage bypass, the low-pressure conduit including a bifurcated pipe between the high-pressure exhaust-gas turbocharger and the first low-pressure exhaust-gas turbocharger and the second low-pressure exhaust-gas turbocharger, the high-pressure conduit including an engine exhaust-gas conduit and a high-pressure stage bypass line, the high-pressure stage bypass line being connected at a first end to the engine exhaust-gas conduit and at a second end to the bifurcated pipe, the high-pressure stage bypass line including a part running below the bifurcated pipe.

To provide a gas-liquid separator that improves the centrifugal force applied to the gas-liquid two-phase fluid flowing through pipes to improve liquid separation performance. The gas-liquid separator includes an inlet pipe (21) and an inner pipe (22). The inlet pipe (21) includes a swirling flow generating member (30) therewithin, and a first drain port (21c) through which the liquid exits. The inner pipe (22) includes an opening (22b) at an end (22a) which is inserted into an end (21b) of the inlet pipe (21). The swirling flow generating member (30) includes a vane supporting portion (31) extending along an axis line (O) of the inlet pipe (21), and stator vanes (32) provided on an outer circumferential surface (31a) of the vane supporting portion (31). The vane supporting portion (31) has a conical shape whose diameter gradually increases from a fluid entering side to a fluid exiting side of the gas-liquid two-phase fluid. The stator vanes (32) surround the outer circumference (31a) with inclining relative to the axis line (O) of the inlet pipe (21).

The invention provides a thermal management system and method for automobile exhaust gas recirculation and an automobile, the thermal management system comprises a heat exchanger, a first pipeline, a second pipeline and a regulating pipeline group, the heat exchanger is provided with a first port and a second port, the first pipeline is provided with a first multi-way valve, the first port is communicated with a first interface of the first multi-way valve, the second pipeline is provided with a second multi-way valve, and the regulating pipeline group is communicated with a second interface of the second multi-way valve. The second port is communicated with the first interface of the second multi-way valve, and the adjusting pipeline group is respectively communicated with the first multi-way valve and the second multi-way valve; according to the technical scheme, the heat exchanger at least has the beneficial effects that by arranging the adjusting pipeline set, the liquid inlet direction of the heat exchanger can be adjusted, so that the heat exchange efficiency is adjusted, the liquid inlet direction in the heat exchanger is adjusted to be reverse under the condition that the temperature is extremely low, the heat exchange efficiency is improved, and the heat exchange efficiency is improved. The heat exchange efficiency of the heat exchanger is reduced, the waste gas condensation temperature is further reduced, and the use temperature range of the waste gas recirculation system is enlarged.

An engine device 1 includes a common rail 16 configured to store, at a high pressure, a fuel supplied by a fuel feed pump 15. The common rail 16 includes a pressure reducing valve 211 configured to discharge the fuel in the common rail 16 to a fuel return pipe 214. The fuel return pipe 214 extends from the pressure reducing valve 211 to a position higher than the pressure reducing valve 211, and then extends to a position lower than the pressure reducing valve 211.

To avoid, in an engine system comprising an exhaust gas recirculation device, function failure due to infiltration of condensate water into an intake pipe pressure introduction pipe.SOLUTION: A gas fuel supply device for an engine has a fuel cylinder 1, a regulator 2, an intake passage 5 comprising a throttle 3 and a mixer 4, a fuel pipe 8, an engine 10, and an exhaust gas recirculation device 13 that recirculates part of exhaust gas to the intake passage 5 as EGR gas, the gas fuel supply device comprising an intake pressure outlet formed in the intake passage 5, and a mounting part formed around the intake pressure outlet. The regulator 2 has an intake pressure inlet 30 formed on its outer surface. The regulator 2 is fixed to the mounting part by a fixing member in a state where the intake pressure outlet and the intake pressure inlet 30 are in direct and airtight communication.SELECTED DRAWING: Figure 1

To provide an exhaust system for an engine capable of suppressing lowering of a temperature of a catalyst and preventing deterioration of purification performance of the catalyst by suppressing a poisoning phenomenon of the catalyst caused by engine oil.SOLUTION: An exhaust system 1 includes: a main flow passage 3A that is formed within an exhaust pipe 3 and in which exhaust gas flows to pass through a catalyst device 4; an auxiliary flow passage 3B formed within the exhaust pipe 3 separately from the main flow passage 3A and in which exhaust gas flows; a changeover device 6 capable of switching a flow of exhaust gas within the exhaust pipe 3 to either of the main flow passage 3A or the auxiliary flow passage 3B; an electronic control unit 9 that controls the changeover device 6 on the basis of an operating state of the engine 2; and a recirculation passage 8 that connects a portion located downstream of the auxiliary flow passage 3B and an intake passage 2B of the engine 2.SELECTED DRAWING: Figure 1