162results about How to "Reduce exhaust back pressure" patented technology

A method for operating an auto-ignition internal combustion engine that is operable in a single substance mode in which the internal combustion engine is supplied with self-igniting liquid fuel, and a dual substance mode in which the internal combustion engine is supplied with the liquid fuel as an ignition agent and gaseous or liquid alternative fuel, includes operating the internal combustion engine in the dual-substance mode at an increased exhaust gas recirculation rate relative to the single-substance mode, and throttling an air supply in an intake system of the internal combustion engine such that a lambda value in an exhaust gas of the internal combustion engine is in a range greater than 1 up to 1.3.

The invention discloses a complex turbine device with a variable section, comprising a double flow channel turbine volute, wherein the double flow channel turbine volute is provided with two air flow passageways; the double flow channel turbine volute is provided with a volute air outlet and a volute air inlet which are communicated with the air flow passageways; a complex turbine impeller is arranged in the double flow channel turbine volute; and the complex turbine impeller is formed by compounding two turbine impellers which correspond to the two air flow passageways one by one. In the invention, the variable section function can be achieved by design and development of the turbine of a turbocharger and by using the complex turbine device, thereby effectively solving the defects of poor reliability and high cost of a vane type turbocharger with the variable section, effectively improving the efficiency of the turbine of an engine in low speed and increasing the torque output of the turbine.

The invention discloses an exhaust muffler capable of automatically adjusting the overflow area, which comprises an air inlet pipe, an expansion chamber and an air outlet pipe, wherein the inner circle of the section (provided with radial through-holes) of the air inlet pipe is provided with a piston which can slide to and fro along the inner wall of the pipe, and the front end of the piston faces the air inlet direction, while the rear end is provided with a pressure spring which can apply pressure (with a direction opposite to the air inlet direction) to the rear end. The invention adopts a structure that the exhaust pipe section of the air inlet pipe is provided with the piston which divides the exhaust pipe section into an exhaust part and a closed part, the position of the piston can be automatically adjusted according to the exhaust pressure and the piston can reset under the action of the spring when the exhaust pressure is low; therefore, the exhaust muffler has the advantages of adjusting the area of the airflow ventilating section according to the exhaust gas flow of an engine under different working conditions, keeping the exhaust airflow in an even flow velocity, effectively lowering the exhaust backpressure, reducing the regenerated noise of the airflow, improving the erasure effect of the muffler, and having a positive significance for reducing the fuel consumption and carbon dioxide emission of an automobile.

The invention provides an electric-assistance variable nozzle turbocharging system, and belongs to the technical field of turbochargers. The electric-assistance variable nozzle turbocharging system and the control method thereof aim at enabling a motor and a turbine variable nozzle ring to be coordinated through the influences of the motor and the turbine variable nozzle ring on performance of an engine. A diesel engine cylinder is directly connected between a gas inlet branch pipe and an exhaust branch pipe of the system. A gas inlet pipe is connected to the gas inlet branch pipe. An exhaust pipe is connected to the exhaust branch pipe. An intercooler is installed on the gas inlet pipe. An electric-assistance variable nozzle turbocharger is installed at an inlet of the gas inlet pipe and an outlet of the exhaust pipe. According to the electric-assistance variable nozzle turbocharging system and the control method, the high-speed motor is controlled on the basis of the air-fuel ratio of a diesel engine and the state of a storage battery, the gas inflow amount of the cylinder can be effectively and rapidly regulated so as to be matched with the changes of the oil spray amount, coordinated synchronization of oil and gas is achieved, it is ensured that the diesel engine keeps an appropriate air-fuel ratio value under various working conditions, and meanwhile it is ensured that the battery works in a high-efficiency area.

A marine exhaust gas scrubbing device including an enclosure having a first end and a second end, an exhaust gas inlet, at least one quencher, at least one pre-treater, at least one venturi component including a venturi inlet and a venturi outlet, an impingement basket, at least one demister, an exhaust gas outlet, and a receiver, and a process for scrubbing a marine exhaust gas including cooling the exhaust gas, pre-treating the exhaust gas, washing the exhaust gas, mixing the exhaust gas and exhausting the scrubbed exhaust gas.

A twin scroll turbocharger device for an internal combustion engine comprising a turbine and a compressor wherein the turbine comprises a first turbine scroll and a second turbine scroll, and wherein at least said first turbine scrolls is provided with a turbine scroll inlet valve such that the exhaust gas flow through the first turbine scroll is controllable. The twin scroll turbocharger device is further characterized in that a bypass conduit is provided between a compressor and at least the first turbine scroll. The bypass conduit is provided with a bypass conduit valve such that a flow through said bypass conduit is controllable.

In a method for diagnosis of an exhaust turbocharger for an internal combustion engine, at least one value which characterizes the load on the exhaust turbocharger is determined and compared with a reference value, an event signal being generated in the event of the reference value being exceeded. A wear characteristic number which characterizes the alternating load on the exhaust turbocharger is formed by addition of load signals, in each case one change signal being generated whenever the charger speed of the exhaust turbocharger exceeds a maximum.

The invention provides a semi-closed type timing constant-volume thermodynamic circulation method and a semi-closed type timing constant-volume thermodynamic circulation system of a prime motor. The thermodynamic circulation method comprises six processes, namely multi-compression-stage intercooling, countercurrent heat exchanging, timing constant-volume burning, adiabatic expansion, aftercooling, and carbon dioxide and water removal. Heat-power conversion is achieved in the thermodynamic circulation. In the process of multi-compression-stage intercooling, compression power consumption is lowered; in the process of countercurrent heat exchanging, the enthalpy of an expanded working medium is recovered to participate in thermodynamic circulation; the process of timing constant-volume burning effectively inhibits the generation of harmful pollutants such as HC, CO, PM and NOx; in the process of adiabatic expansion, complete expansion for working is achieved; in the process of aftercooling, the working medium is further cooled to the environment temperature and the expansion ratio in the process of adiabatic expansion is enhanced; in the process of carbon dioxide and water removal, the carbon dioxide and the water generated in the process of timing constant-volume burning are removed; the remaining work mediums participate in the next thermodynamic circulation. By the method and the system, the direction is defined for designing a high-efficiency low-pollutant-emission and high-performance prime motor in the future.

The invention discloses an SCR post treatment pipeline device for a large displacement engine, which includes an ejection pipeline. The ejection pipeline is provided with at least one nozzle that can spray carbamide liquor in the ejection pipeline. The nozzle is mounted on the ejection pipeline in a mode that the spraying direction is along the flow direction of the smoke body in the ejection pipeline and the spraying axis of the nozzle forms an included angle together with the axis of the ejection pipeline positioned along the spraying direction of the nozzle. Mixers are respectively arranged along the spraying direction of the nozzle in the ejection pipeline. The device can lead the carbamide liquor to be fast hydrolyzed to release ammonia and uniformly mixed with waste gas. The hydrolyzing rate of the carbamide is higher, thus leading an NOx compound to have longer reaction time and to be fully reacted and leading the SCR system to have higher waste gas conversion rate.

The invention provides an automobile muffler for reducing exhaust back pressure. For the muffler, a shell is internally provided with a first baffle plate and a second baffle plate which divide the inner part of the shell into three chambers sequentially, including a first and a second expanding chamber and a resistive muffling chamber; from outside the shell, an air inlet pipe sequentially passes through a front end cover of the shell, the first baffle plate and the second baffle plate and then extends into the second expanding chamber; from the first expanding chamber, an air outlet pipe sequentially passes through the first baffle plate, the second baffle plate and the rear end cover of the shell and then passes out of the shell; a transition pipe passes through the first baffle plate and the second baffle plate from the first expanding chamber and then extends into the second expanding chamber; inside the resistive muffling chamber, parts of the air inlet pipe, the air outlet pipe and the transition pipe are all provided with micropores on pipe walls; and the outlet end of the air inlet pipe, the inlet end of the air outlet pipe and the inlet end of the transition pipe are all of the structure of expanded openings. The structure of the muffler can reduce the speed of exhaust air stream through smooth expansion and contraction, and expansion and contraction again, decrease the exhaust back pressure and improve the power and torque of a motor.

Particle filters and a method for the purification of an exhaust-gas flow are described. In one example, exhaust gas is directed solely to a first particulate filter until a predetermined condition. Then exhaust gas is directed to a second particulate filter. One particulate filter may surround the other of two particulate filters. The particulate filters may provide filtered exhaust gas even when one filter becomes at least partially loaded.

The invention relates to a gasoline engine tailing gas particle filtering device catalyst and a preparation method thereof. The catalyst comprises a carrier, the inner wall of a hole of the carrier iscoated with a catalytic coating layer, the coating mount of the catalytic coating layer is 50-120 g/L, the height of the catalytic coating layer in the axial direction is 100% of the height f the carrier, the catalytic coating layer comprises cerium-zirconium rare-earth oxides, gamma-aluminum oxides and precious metal active components, the precious metal active components comprise Pd and Rh, wherein the loading amount of Pd is 0.1-1.5 g/L, and the loading amount of Rh is 0.05-0.5 g/h. the catalyst has the advantages that through the improvement of a catalytic coating layer coating technology, the uniform dispersing distribution on the inner wall structure of the hole of the catalytic coating layer is achieved to significantly reduce the gas discharging back pressure of a particle filtering device catalyst, the effects of intercepting particles and converting gaseous pollutants are well achieved by the uniformly distributed catalytic coating layer, and therefore gas discharging back pressure is reduced by the prepared filtering device catalyst while the particle capturing rate and catalytic performance are not impacted by negative influences.

The invention relates to a multifunctional muffler structure. The multifunctional muffler structure comprises a barrel body, an inner partition plate A, an inner partition plate B, an inner partition plate C and an inner partition plate D are arranged in the barrel body, and an air inlet muffler pipe, a middle muffler pipe and two air outlet muffler pipes are fixed in the barrel body; the four inner partition plates divide the barrel body into five muffler cavities. The air outlet muffler pipes are arranged symmetrically, so that exhaust back pressure is favorable for being reduced, and then the work efficiency of an engine is ensured; because siphons are arranged on the air outlet muffler pipes, water accumulating in a muffler can be eliminated by the utilization of the pressure difference between an inlet and an outlet of the muffler and on the basis of the siphon principle, the muffler is prevented from rusting, and the service life and the using reliability of the muffler are ensured; due to the combination of the multiple muffler cavities and the muffler components, exhaust noise is reduced substantially, and the riding comfort of a whole vehicle is improved; the application of a stamped shell makes the muffler be more beautiful and more elegant and fully show the feel of modern science and technology.

A shunt pulsation trap for a positive displacement (PD) internal combustion engine (ICE) reduces pulsation, noise, vibration and harshness (NVH), and overall size of the exhaust system and improves cycle (fuel) efficiency. Generally, a shunt pulsation trap for a PD-ICE is configured to trap and attenuate gas pulsations before discharge to engine outlet and comprises a chamber (trap volume) adjacent to the PD-ICE cavity, therein housed various pulsation dampening means or pulsation containment means, at least one relief port (trap inlet) branching off from the PD-ICE cavity into the pulsation trap chamber and a feedback region (trap outlet) communicating with the PD-ICE outlet. The associated principles, methods and embodiments are disclosed.

Systems and methods for a twin turbocharged engine with a single exhaust gas recirculation (EGR) system are disclosed. In one example approach a system is provided comprising a first turbocharger in a first intake passage with a low-pressure EGR system fluidically coupling exhaust exiting the first turbocharger to intake air entering the first turbocharger, and a second turbocharger in a second intake passage without a low-pressure EGR system fluidically coupling exhaust exiting the second turbocharger to intake air entering the second turbocharger.

The present invention relates to a method and system for gasoline particulate filter operations. Methods and systems are provided for optimal operation of a gasoline particulate filter coupled to an engine exhaust system. Based on engine operating conditions, a target soot level on the GPF may be determined, and one or more engine operating parameters may be adjusted to maintain the actual GPF soot level at the target level. In one example, if the actual GPF soot level is lower than the target level, one or more of a fuel injection timing and a fuel rail pressure may be adjusted to increase soot generation, and if the actual GPF soot level is higher than the target level, the GPF may be regenerated until the actual soot level reaches the target level.

The invention discloses a black smoke catcher used for a diesel engine. The diesel engine can generate a large amount of black smoke at the cold starting moment and during high-load operation, however, no good solution exists at present. The black smoke catcher used for the diesel engine is composed of a catcher cylinder body, a black smoke particle collecting end connected with the lower end of the catcher cylinder body and a catcher gas outlet end connected with the upper end of the catcher cylinder body. A cylinder of the catcher cylinder body is provided with a gas inlet, a gas inlet baffle enabling air flows to be dispersed is fixed onto the inner wall of the cylinder, a filter element is arranged in the cylinder and an electromagnetic pulse pneumatic control valve is further fixed onto the inner wall of the cylinder. Black smoke tail gas generated during operation of the diesel engine is caught through filtering of the filter element and back flushing of the electromagnetic pulse control valve, and the black smoke removing rate reaches over ninety percent. The black smoke catcher used for the diesel engine has the advantages of being compact in structure, resistant to high temperature, easy to tailor, firm, durable and the like, increases the black smoke capturing rate, further reduces exhausting backpressure, is convenient to install and replace, and reduces the use cost and the maintenance cost.