What is the exhaust delay angle? The value range of the exhaust delay angle is .

In order to ensure that the intake of the cylinder of the engine is sufficient and the exhaust is thorough, the valve is required to have the maximum passing capacity as possible, so the actual opening and closing of the intake and exhaust valves of the engine are not exactly at the upper and lower dead center of the piston, but are appropriately advanced and delayed.

The purpose of the early opening of the intake valve is to ensure that fresh gas or combustible mixtures can enter the cylinder smoothly and sufficiently.

The purpose of late intake valve closure is to use the pressure in the cylinder to temporarily lower than the atmospheric or ambient pressure at the beginning of the compression stroke, so that fresh gas or combustible mixtures may continue to enter the cylinder by the inertia of the intake air flow. In this way, the crankshaft angle for the duration of the intake valve opening is actually greater than 180.

The purpose of early opening of the exhaust valve is: when the piston power stroke is close to the bottom dead center, the combustion expansion of the combustible mixture has basically ended, but the gas pressure in the cylinder is still high, and the exhaust gas in the cylinder can be discharged quickly by using this pressure;

The purpose of the exhaust valve delay closure is to use the inertia of the exhaust flow to continue to discharge the exhaust gas because the pressure in the cylinder is still higher than the atmospheric pressure when the piston reaches the top dead center. As a result, the crankshaft angle for the duration of the exhaust valve opening is actually greater than 180.

Due to the early opening of the intake valve and the late closing of the exhaust valve, there will be a period of time when the intake and exhaust valves are opened at the same time. The period of time when the intake valve and exhaust valve are opened at the same time or the angle of the crankshaft is called the valve overlap time or valve overlap angle, and the magnitude of the valve overlap angle is equal to the sum of the early opening angle of the intake valve and the late closing angle of the exhaust valve.

Because the overlap angle of the valve is small, and the inertia of the fresh gas and the exhaust gas flow should maintain the original flow direction, as long as the valve overlap angle is appropriate, there will be no problems such as the exhaust gas backflow into the inlet pipe and the fresh gas discharged with the exhaust gas.

The angle from the point to the exhaust valve closing on a crankshaft is called the exhaust delay angle.

That is, the exhaust hysteresis angle generally refers to the mechanical hysteresis angle. That is, the angle at which the deflection direction of the rotor lags behind the unbalanced force of the rotor, which is 90 degrees when the speed reaches the first critical speed.

Optical fiber automatic precision winding is an important technology in missile optical fiber guidance, in which the hysteresis angle is the key factor in the optical fiber precision winding, and the control of the hysteresis angle is completed by the lead screw subsystem.

The angle of rotation of the crankshaft corresponding to the top dead center point to the closing of the exhaust valve is called the exhaust delay angle.

The intake valve opens early and closes late, so there is an intake delay angle. Late closing of the intake valve is conducive to inflation and increases the charge factor. If the delay angle is too small, it will lead to insufficient inflation, and if the delay angle is too large, it will cause some of the gas to flow back out of the air inlet, which will reduce the charge.

The angle at which the crankshaft turns from the top dead center to the closing of the exhaust valve is called the exhaust lag angle and is denoted as δ. Generally 10° 30°

After the piston has crossed the exhaust top dead center, the exhaust valve is closed during the next intake stroke.

')"ls[ci3]","1","symbol","c_5dfb62478e5b4"When the engine is running at high speed, the intake valve is played earlier in order to increase the air intake.

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The value range of the delay angle next to the return of air is (auspicious hunger).

Correct answer: 0°-30°