Variable geometry exhaust pipe turbocharging system

Abstract

The invention relates to a variable geometry exhaust pipe turbocharging system in the technical field of internal combustion engines. The system comprises cylinders, exhaust branch pipes, exhaust pipes, a connecting pipe, a valve and a turbine, wherein the two ports of the connecting pipe are connected with the tail parts of a first exhaust pipe and a second exhaust pipe; the valve is arranged on the connecting pipe; the cross section areas of a first exhaust branch pipe, a second exhaust branch pipe, a seventh exhaust branch pipe and an eighth exhaust branch pipe are gradually reduced from the cylinders to the exhaust pipes; and a third exhaust branch pipe, a fourth exhaust branch pipe, a fifth exhaust branch pipe and a sixth exhaust branch pipe are constant-section pipes. When the valve is closed, a pulse charging mode is adopted, so that pulse energy can be fully utilized, the maximum exhaust temperature difference of each cylinder is small, and an engine has high performance under the low-speed working condition and the transient working condition; and when the valve is opened, a quasi-constant pressure charging mode is adopted, so that pumping loss is low, and the engine has high performance under the high-speed working condition. The invention is reasonable in design, simple in structure and suitable for the turbocharging system of which the turbine is provided with two inlets and is laterally arranged.

Description

technical field [0001] The invention relates to a turbocharger system in the field of internal combustion engines, in particular to a variable geometry exhaust pipe turbocharger system. Background technique [0002] With the development of society and the improvement of environmental protection requirements, the application of engine supercharging technology is becoming more and more extensive. Most of the engines with medium and high power adopt turbocharging technology to improve power and reduce fuel consumption. The two basic types of turbocharging systems are constant pressure supercharging system and pulse supercharging system. Constant pressure supercharging system, each cylinder shares an exhaust pipe with a large volume, the structure of the exhaust pipe system is relatively simple, the pressure in the exhaust pipe is basically kept constant, the pressure is only related to the load and speed of the engine, different cylinder numbers The supercharging system of the...

AI Technical Summary

Problems solved by technology

[0003] After searching the existing technical literature, it is found that Chinese patent number ZL200920210502.1, patent name: turbocharger device with adjustable exhaust flow path, the test results of this patented technology show that this technology can better balance the high and low speed of the engine In the working condition, the fuel consumption of the front row of the turbine and the low-speed engine condition has been significantly reduced; Under working conditions, the maximum exhaust temperature difference of each cylinder is relatively large

Images