90results about How to "Increase EGR rate" patented technology

A method for controlling combustion in a cylinder of a turbocharged engine in which intake air is reserved upstream of the cylinder. The method comprises decreasing an internal EGR rate in the cylinder during a tip-out condition if the temperature of the intake air is above a threshold, and increasing the internal EGR rate in the cylinder during a tip-out condition if the temperature of the intake air is below the threshold.

The invention provides an exhaust gas flow measuring system and measuring method and a closed loop control method. A temperature sensor, a first pressure sensor and a second pressure sensor are addedon the basis of an EGR system and an engine controller of the system. The engine controller calculates theoretical exhaust gas flow in different opening of an EGR valve according to relative data fedback by the temperature sensor, the first pressure sensor and the second pressure sensor. Flow coefficient of EGR valve under different opening can be obtained by using flow characteristics of the EGRvalve. Actual exhaust gas flow of the EGR valve under different opening is obtained by modifying the theoretical exhaust gas flow by the flow coefficient. According to the system, the flow can be calculated without components such as a Venturi Flowmeter, and therefore incorrect calculation of exhaust gas flow caused by unreasonable design of the Venturi Flowmeter can be avoided.

The invention provides an EGR (exhaust gas recirculation) air mixing device and a fuel engine with an EGR system. The EGR air mixing device comprises an EGR inlet pipe and a Venturi mixer, wherein the Venturi mixer comprises a contraction section, a throat section and a diffusion section; the diffusion section is provided with a connector; the EGR inlet pipe is communicated with the connector of the diffusion section; the throat section is integrated with the diffusion section; the throat section is embedded into the connector of the diffusion section; an annular gap in the circumferential direction of the throat section is formed in the embedding position; the annular gap forms a certain angle with an axial line of the throat section; and the contraction section is hermetically connected with the diffusion section at the connector of the diffusion section. According to the EGR air mixing device, the annular gap is formed between the throat section and the diffusion section, and EGR air is guided into an air inlet pipe from the gap to be mixed with inlet air, so that the fact that the EGR air can be fully mixed with fresh air can be guaranteed, the EGR rate uniformity of each cylinder is improved, and the EGR rate of the fuel engine is effectively increased.

An exhaust port structure of a cylinder head includes a connection pipe communicating with a plurality of exhaust ports of the cylinder head and an exhaust hole connected to the connection pipe and performing a function of an exhaust manifold, wherein the connection pipe has an EGR line integrally formed and connected thereto and each of the exhaust ports is formed with the same shape or a symmetrical shape, and the present invention can reduce the weight of the cylinder head and the manufacturing cost and improve the EGR rate and T/C efficiency.

The invention discloses a control method and device of a natural gas engine, a storage medium and a processor. The method comprises the following steps: determining the estimated knock intensity according to the knock intensity change rate of the natural gas engine and the current working condition parameter; judging whether the current knock intensity and the estimated knock intensity meet a first preset condition or not; and when the current knock intensity and the estimated knock intensity meet the first preset condition, reducing an ignition advance angle, and increasing the EGR rate of acylinder during exhaust gas recirculation, so that the knock tendency is reduced. Through the application, the problems in the related art that knocking tendency is weakened by adjusting the ignitionadvance angle after the engine knocks and the knocking tendency is difficult to reduce before knocking are solved.

An exhaust gas recirculation system having an exhaust line connected to an exhaust manifold of an engine; an intake line connected to an intake manifold of the engine; and an EGR line that intercommunicates the exhaust line and the intake line, in which a part of exhaust gas exhausted from the exhaust line is delivered to the intake line via the EGR line to be recirculated in the engine, is provided with a liquid cooling heat exchanger made of a corrosion-resistant material at downstream of an intersection with the EGR line in the intake line.

The present invention provides an EGR valve device (1) that includes a valve housing (2) of which inside exhaust gas passes through, a poppet valve (3) as a valve body accommodated in the valve housing (2), and a hydraulic servo actuator (4) for driving the poppet valve (3) to be opened and closed. The hydraulic servo actuator (4) is provided by a three-port ( Figure 2 ) or four-port servo valve.

The invention relates to a controllable EGR system using an integrated dual-channel EGR cooler. The system involves the integrated cooler and a double-channel structure formed by two exhaust manifolds, wherein the integrated cooler comprises two cold channels and two heat channels which are independent from one another, each exhaust manifold is connected with air inlet ends of one cold channel, one heat channel and a turbine through three air channels, the air outlet ends of the cold channels and the air outlet ends of the heat channels are connected with the air inlet end of a device air outlet cavity arranged in the integrated cooler, and the air outlet end of the device air outlet cavity and the air outlet end of an air compressor are connected with an engine after sequentially througha mixer and an air inlet manifold. According to the system, the EGR temperature and the EGR rate can be adjusted through a cold EGR and heat EGR combined mode, so that the adjusting capacity is high,and the EGR can be driven by utilizing exhaust pulse energy, so that the EGR rate and the driving capacity are improved.

The invention provides an EGR mixing device. The device comprises an EGR mixing pipe communicating with an air inlet pipe and a combustion chamber, an EGR mixing cavity is formed in the inlet segmentof the air inlet pipe of the EGR mixing pipe, a waste air inlet communicating with the EGR mixing cavity is formed in the side wall of the EGR mixing pipe, a mixing cavity support is supported and erected in the EGR mixing cavity, an air inlet valve plate for blocking the waste air inlet is supported and erected on the mixing cavity support, the air inlet valve plate comprises a first closing sidepushed by input air in the air inlet pipe to be closed and a second opening side pushed by input air of the waste air inlet to be opened. Fresh air and waste air are mixed in the EGR mixing cavity, the waste air inlet is blocked or opened through the air inlet valve plate on the mixing cavity support, when the waste air inlet is blocked, backflow caused by the fact that air pressure in the air inlet pipe is larger than that of the waste air inlet is avoided, the air inlet structure of an EGR pipeline is simplified, the pressure difference between the fresh air and the waste air is used for blocking the waste air inlet, the pressure resistance of the EGR pipeline is small, and the EGR rate is improved. The invention further provides an internal combustion machine.

An exhaust gas recirculation device for an engine having a cylinder head with a suction port and an exhaust port, provided with a mechanism for recirculating a portion of exhaust gas to the suction side of the cylinder head, comprises a connection hole is opened through a wall of the cylinder head disposed between the suction port and the exhaust port. The connection hole is bored vertically slantwise. The connection hole at the suction side is opened along the direction of swirls of sucked air. A throttle is disposed in at least either a suction flow passage communicating with the suction port or an exhaust flow passage communicating with the exhaust port so that the opening area of the suction flow passage or the exhaust flow passage can be adjusted by the throttle.

The invention relates to a control system and a control method for reducing NOx emissions of a diesel engine under all working conditions. The control system comprises an engine, an air filter, an air compressor, a turbine coaxially connected with the air compressor, an intake intercooler, an intake manifold, an exhaust manifold, a gamma sensor and an intake tube pressure sensor which are arranged on the exhaust manifold, a coolant temperature sensor, a high-response torque sensor and a high-response rotational speed sensor which are arranged on the engine, an exhaust pipe pressure sensor arranged on the exhaust manifold, a single-chip microcomputer provided with an air-fuel ratio calculation program, an electronic control unit (ECU), a butterfly valve, two EGR valves and an EGR cooler. Corresponding signals are acquired through the sensors and transmitted to the electronic control unit, the electronic control unit judges a working condition according to the corresponding signals, and then the butterfly valve and the two EGR valves are controlled to change an air-fuel ratio. The control system disclosed by the invention is high in control accuracy; a high EGR rate can be realized on the basis of the system; and the purpose of reducing NOx emissions in a range of all working conditions can be achieved by taking the air-fuel ratio as a control object.

Provided is an exhaust gas purification device for a marine diesel engine which enables treatment discharge water to be discharged into special marine areas, and enables waste treatment water to be discharged into areas other than special marine areas even when the vessel is moving, particularly in exhaust gas treatment in a marine diesel engine that uses fuel with a quality equal to or lower than that of fuel oil. In this exhaust gas purification device for a marine diesel engine using fuel with a quality equal to or lower than that of fuel oil, a gas cooler is provided in the exhaust gas path or an EGR gas path, an electrostatic cyclone exhaust gas purification device is provided downstream from the gas cooler, and a PM-free scrubber which dissolves/removes almost no PM is provided downstream from an electric dust-trapping means.

The invention discloses an exhaust gas recirculation system and an engine. The exhaust gas recirculation system comprises a first turbosuperchager and a second turbosuperchager which are in series connection. An outlet of a power turbine of the second turbosuperchager is connected with an exhaust pipe, an inlet of a gas compressor of the second turbosuperchager communicates with the exhaust pipe through an EGR gas getting pipe, an outlet of the gas compressor of the second turbosuperchager communicates with a gas inlet manifold through a low-pressure EGR waste gas pipe, the system repeatedly uses waste gas energy to push power turbines of the two stages of turbosuperchagers, the waste gas use rate is improved, energy losses brought by front getting of waste gas of the turbosuperchagers canbe reduced, the first turbosuperchager can be matched with the efficient gas compressor, the oil losses are reduced, the exhaust temperature is improved, the conversion efficiency of a post-treatmentsystem is improved, meanwhile, the EGR gas pressure and waste gas amount can be improved, a gas inlet throttling valve is not needed, the conditions of pump gas losses, engine oil consumption increasing, particle discharge increasing and the like are avoided, and engine economy is improved.

The invention provides a waste gas recirculating system, a motor vehicle, and a control method of the waste gas recirculating system. The system comprises an EGR before-cooling pipeline, an EGR cooler, an EGR after-cooling pipeline, an engine, an air intake main pipe, an exhaust main pipe and an EGR butterfly valve, wherein at least one exhaust manifold of the engine is connected with the exhaust main pipe and the EGR before-cooling pipeline through the EGR butterfly valve. When the EGR butterfly valve is in a first state, at least one exhaust manifold is communicated with the EGR before-cooling pipeline; waste gas discharged by the at least one exhaust manifold enters the EGR cooler by the EGR before-cooling pipeline for cooling; the cooled waste gas is input into the air intake main pipe by the EGR after-cooling pipeline, and is led into the engine by the air intake main pipe. When the EGR butterfly valve is in a second state, at least one exhaust manifold is communicated with the exhaust main pipe, and the waste gas discharged by the at least one exhaust manifold is exhausted by the exhaust main pipe. The system can enhance the EGR rate and reduce the conditions of pumping loss and air inflow reduction of the engine.

The invention discloses an EGR cooler comprising a shell, a heat exchange tube stack, an end cap and an adjusting device. The adjusting device comprises a rotary driving portion and a rotary plate in drive connection with the rotary driving portion, and the rotary plate is provided with a first waste gas via hole. The end cap comprises a cap body and an adjusting plate fixed to the cap body, the cap body is provided with a waste gas inlet communicated with the first waste gas via hole, multiple second waste gas via holes are formed in the adjusting plate and respectively communicated with multiple heat exchange tube bundles arranged in the heat exchange tube stack and unequal in heat exchange area, the rotary plate has a rotary stroke relative to the adjusting plate, and in the rotary stroke of the rotary plate, the first waste gas via hole is communicated with the second waste gas via holes in sequence. The EGR cooler is compatible to two operating conditions of low exhaust temperature and small EGR rate and high exhaust temperature and large EGR rate, temperature of cooled waste gas is more accurately controlled according to the different operating conditions, and arrangement of internal parts of an engine is facilitated. The invention further discloses the engine.