1. The pressure relief valve
known as a relief valve the safety valve (safety valve) according to the working pressure of the system can automatically open and close, usually installed in a device or system security protection closed pipeline system. When the internal pressure of the equipment or pipeline exceeds a set pressure relief valve, pressure relief opening automatically, to ensure that equipment and the pipeline pressure medium under setting pressure, protective equipment and piping, to prevent accidents.
In turbocharged car driving apparatus, when the accelerator pedal depression acceleration, throttle opening, the engine speed will improve with the development emitted ldquo; En hellip; hellip; rdquo; sound exhaust gas energy of the engine exhaust gas discharged high temperature and pressure to promote the rotation of the turbine, while when the rotational speed of the turbocharger reaches the work (i.e., the turbine is rotated more than 100,000 revolutions per minute in a), only the turbocharger compresses ambient air the intake air amount of the engine increase, enhance the engine power.
However, when we skimmer, the opening degree of the throttle valve is closed rapidly decreases until an idling state, that is to say the engine does not require the air intake, or intake pipe airflow will be blocked at the throttle valve. But at this moment the turbocharger and did not stop working, due to inertia turbocharger remained at 100,000 revolutions per minute or more to continue spinning speed. Now imagine, at this time still continues to be a steady stream of air compressed into the intake manifold, if this part of the high pressure air can not be discharged in time in the intake manifold, the intake pipe will rapidly increase in pressure, ranging from accelerated appear drag, speed up poor, it may cause heavy damage or throttle intake pipe burst.
In this case, it is necessary to install in the intake duct in a pressure relief device, to remove the excess high-pressure air duct from the intake of the turbine compressed. In fact, the pressure relief valve is a valve mounted on the inlet pipe, for controlling the supercharging pressure. Closing the relief valve is controlled by an ECU (Electronic Control Unit) solenoid operated. ECU will rootAccording to the level of the boost-pressure turbine outlet to judge, as soon as the pressure exceeds a critical value, the electromagnetic coil will be turned on or off control, to open or close the relief valve.
When the relief valve is closed to ensure that sufficient feed intake pressure based intratracheal, when the valve is open can vent excess gas to the atmosphere, reducing the intake manifold pressure, engine intake duct protection . So we hear modified car ldquo; bared, bared rdquo; sound is the sound pressure relief valve in the exhaust of relief.
In fact, given the car converted ldquo; ci, ci rdquo; sound is not meaningful to improve engine performance, but can render a significant boost value artifacts. Relatively speaking, the greater the boost value of the engine, which exhaust air relief valve relief the more, the greater the noise generated theoretically. The modified car when the pressure relief valve relief when the sound is amplified, like using a large barrel exhaust pipe as mdash; mdash; movement is cool, but little practical effect.