Structure for preventing surge of supercharger and engine intake and exhaust system

Abstract

The invention relates to the field of vehicles, and discloses a structure for preventing surge of a supercharger and an engine intake and exhaust system. The structure for preventing surge of the supercharger comprises a throttle valve and a bypass valve. According to the structure for preventing surge of the supercharger, when an accelerator is suddenly loosened, the throttle valve is closed at the speed higher than 30% A / s, the air pressure on the upstream of a first valve plate is increased instantaneously, the rotating speed of the first valve plate is increased instantaneously, and the first valve plate obtains inertia force caused by instantaneous increase of the rotating speed of the first valve plate; and the inertia force can offset acting force applied to a second valve plate byan elastic element, thus, the second valve plate rotates, a second air inlet communicates with a second air outlet, redundant air in a first air inlet is exhausted through the bypass valve, the firstair inlet is subjected to pressure relief, and surge of the supercharger is prevented.

Description

technical field [0001] The invention relates to the field of vehicles, in particular to a structure for preventing supercharger surge and an engine intake and exhaust system. Background technique [0002] At present, most internal combustion engines use superchargers to increase power, and surge is the most common failure of superchargers, especially in the case of small flow and high pressure ratio. Surge can cause problems such as noise, turbocharger shaft damage, unstable engine operation and vibration. For this reason, the supercharger will be matched when designing and developing the internal combustion engine. A good match will make the supercharger run in the high-efficiency range without surge and other harsh conditions. [0003] However, when the working conditions change, such as channel blockage, too high or too low load, uneven load of diesel engine and sudden change of load, etc., the supercharger will run into the surge area, causing surge. Specifically, the ...

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Problems solved by technology

[0003] However, when the working conditions change, such as channel blockage, too high or too low load, uneven load of diesel engine and sudden change of load, etc., the supercharger will run into the surge area, causing surge

Specifically, the throttle valve of the internal combustion engine can adjust the size of the intake air flow, thereby controlling the intake state of the engine; but when the engine load is large and the speed of the supercharger is high, the driver suddenly releases the throttle, which will cause the throttle valve to change from large to large. The opening quickly changes to a small opening; at the same time, during the calibration process of the engine, in order to ensure the after-treatment temperature, the throttle valve will be instantly controlled at a small opening, thereby reducing the intake air volume of the engine and maintaining a high exhaust temperature

However, this will cause the supercharger to have a large pressure ratio and a small flow rate, which will easily cause the supercharger to surge

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