Throttle system of engine exhaust

Abstract

The invention discloses a throttle system of engine exhaust. The throttle system is characterized in that an exhaust tail pipe of a muffler is connected and provided with an electric control exhaust throttle, a control system can timely control a throttle motor to work to adjust the opening degree of the throttle according to a rotating speed signal of an engine, a sectional area of an exhaust passage of the electric control exhaust throttle can be expanded along with the increase of the rotating speed of the engine, the exhaust back pressure can be decreased along with the increase of the rotating speed of the engine, then the loss power during forced exhaust of the engine can be reduced, and the output power of the engine can be improved.

Description

[0001] Technical field [0002] The invention relates to an engine exhaust throttle system capable of adjusting the cross-sectional area of ​​an exhaust pipe according to the engine speed. Background technique [0003] As we all know, the exhaust volume of the engine cylinder increases with the increase of the speed, and the time of exhausting each time decreases with the increase of the speed, which requires the exhaust back pressure to increase with the increase of the speed. Decrease, in order to reduce the power consumed by forced exhaust. [0004] At present, the known engine exhaust system back pressure setting has the following two types; [0005] 1. Adopt the technology of exhaust pipe ventilation cross-sectional area with constant setting. This technology needs to take into account the torque output of the engine at low speed, and there is a phenomenon that the exhaust back pressure increases with the increase of engine load, thus restraining the engine from running....

AI Technical Summary

Problems solved by technology

[0005] 1. Adopt the technology of exhaust pipe ventilation cross-sectional area with constant setting. This technology needs to take into account the torque output of the engine at low speed, and there is a phenomenon that the exhaust back pressure increases with the increase of engine load, thus restraining the engine from running. Disadvantages of increased torque output under heavy load

[0006] 2. Two-stage adjustment of the cross-sectional area of ​​the exhaust pipe is adopted. This technology is to set a pressure relief valve in the exhaust pipe to open the bypass air passage when the exhaust back pressure is higher than the set value, increasing the cross-section of the exhaust pipe. area; due to the need to take into account the torque output of the engine at low speeds, it is necessary to use the pressure relief valve to meet the large ventilation cross-sectional area when the engine is under heavy load. The defect that the output torque cannot be fully increased

Although this technology is far superior to the exhaust pipe cross-sectional area setting constant technology, but there is still the exhaust back pressure is too low when the engine is idling; the exhaust back pressure is too low when the solenoid valve is about to open the second exhaust pipe. High; when the solenoid valve just opens the second exhaust pipe, the exhaust back pressure is too low; when the engine is under maximum load, the exhaust back pressure is too high

Images