Function of throttle valve Maintenance of throttle valve

The throttle is actually the so-called throttle, which is controlled by the accelerator pedal and used to adjust the air intake. At present, there are two main types: mechanical-by stepping on the accelerator pedal, driving the steel cable connected to the accelerator under the pedal to open and close the accelerator; There is no traditional cable connection between electronic throttle, accelerator pedal and accelerator, but it is controlled by electronic sensor, which has higher control accuracy and improves throttle lag. Then, let me introduce the function of throttle and its maintenance.

Function of throttle valve

1, ease. Relieving position When the pressure of the action pipe below the action piston drops, the action piston drives the hollow valve stem to move down under the pressure of the brake cylinder and the relief spring, the upper end of the hollow valve stem leaves the bottom of the air supply valve, the exhaust valve opens, and the brake cylinder pressure air above the piston is discharged into the atmosphere through the central hole of the hollow valve stem, so that the locomotive is in a relieved state.

2. Pressure maintaining function. When the pressure of the action pipe below the piston increases, the action piston moves upward together with the hollow valve stem. First, the upper end of the hollow valve stem is closely attached to the bottom surface of the air supply valve, thus closing the exhaust valve.

Then, push open the air supply valve and open it. 3. Braking function. When in the braking position, due to the rising of the brake cylinder pressure, the pressure above the acting piston gradually increases, and the acting piston gradually moves down under the action of the brake cylinder pressure above it, the release spring and the spring pressure of the air supply valve, and the opening of the air supply valve gradually decreases.

Maintenance of throttle valve

The main cause of throttle scaling is oil and gas, followed by particles and moisture in the air. In other words, using qualified air filter and removing the crankcase ventilation pipe will slow down the scaling speed of throttle valve. The crankshaft is built in the crankcase, and the lower part is connected with the oil bottom. The working temperature of this part is about 100 ~ 180. Engine oil will volatilize when used. The longer it takes, the higher the temperature and the stronger the volatilization. In addition, the compressed gas of the cylinder will squeeze into the crankcase through the gap of the piston ring, so there must be a channel to vent the gas.

Otherwise, the oil bottom will form a positive pressure (see the related article in Nightcrawler for details). The reason why the crankcase ventilation pipe is connected to the throttle valve is the requirement of environmental protection on the one hand, and the gas is pumped out of the crankcase by using the negative pressure of intake air on the other hand. When the oily steam reaches the intake pipe and cools, the oil in it will condense on the intake and throttle valve, and then the carbon deposit in the steam will also be deposited on these parts. Because the gap where the throttle valve is opened has the largest air flow, small space and low gas temperature, this part is the easiest to condense. Therefore, how long the throttle will be dirty depends on the quality of the air filter, the brand and quality of the engine oil, the condition of the driving section, the temperature, the working temperature of the engine, driving habits and so on. Even for individuals, it is impossible to determine the time to clean the throttle with a fixed number of kilometers. The interval between cleaning the throttle for the first time in new cars is the longest. Later, due to the continuous condensation of oil and gas in the crankcase ventilation pipe and air inlet,

Cleaning frequency will increase, and different weather conditions will also affect the speed of throttle scaling. Cleaning of throttle valve

1, which can effectively clean and dredge the glue and carbon deposit of the fuel nozzle and keep the fuel system clean.

2. It can clean the waste gas circulation system, reduce waste gas emission and save fuel, thus effectively protecting the oxygen sensor and the three-way catalytic conversion device.

3. It can help prevent symptoms such as knocking, unstable idle speed and poor acceleration caused by colloid and carbon deposition.

4. It can eliminate the carbon deposit on the valve seat, lubricate the valve and valve guide, improve the sealing performance, restore the cylinder pressure and increase the power.

5. It can blow off the carbon deposit in the combustion chamber, lubricate the upper area of the cylinder, reduce the wear of the piston ring and prolong the service life.