Throttle is actually the throttle, which is controlled by the accelerator pedal to regulate the air intake. At present, there are two main types: mechanical type – the throttle is opened and closed by pressing on the accelerator pedal and the steel cable connected to the throttle under the pedal; there is no traditional steel cable connection between the electronic throttle valve and the accelerator pedal and the throttle valve. It is controlled by an electronic sensor. The control accuracy is higher and the throttle hysteresis is improved. Then, the next Xiaobian for everyone to introduce the role of throttle and throttle maintenance.
The role of throttle
1, mitigation. Relief position When the acting pipe pressure under the action of the piston drops, the acting piston under the pressure of the brake cylinder and the relieving spring will drive the hollow valve rod downward, the upper end of the hollow valve rod leaves the bottom surface of the air supply valve, and the exhaust valve opening is opened. The air pressure of the brake cylinder above the piston is discharged to the atmosphere through the center hole of the hollow valve stem, and the locomotive is in a state of remission.
2, maintaining pressure. When the pressure of the acting pipe below the piston increases, the acting piston together with the hollow stem moves upwards. First, the upper end of the hollow stem is closely attached to the bottom surface of the air supply valve, the exhaust valve opening is closed, and then the air supply valve is opened to open the air supply valve opening.
3, braking effect. In the braking position, because the pressure of the brake cylinder keeps rising, the pressure above the acting piston also gradually increases, and the acting piston gradually moves downwards under the pressure of its upper brake cylinder, the easing spring and the spring pressure of the air supply valve. The opening of the valve gradually decreases.
Throttle maintenance
The cause of throttle fouling mainly comes from oil vapour, followed by particulates and moisture in the air, that is, in the case of using a qualified air filter and removing the crankcase ventilation pipe, the throttle fouling speed will be much slower. The crankcase has a built-in crankshaft and the bottom is connected to the bottom of the oil. The working temperature of this part is about 100° to 180°. The oil will be heated and evaporate during use. The longer it is used, the higher the temperature and the stronger the volatilization. Plus, the cylinder compressed gas will be squeezed into the crankcase through the gap of the piston ring, so there must be a channel to let go of the gas, otherwise A positive pressure will form at the bottom of the oil (for details, please refer to the article "The Dark Knight"). The reason why the crankcase ventilation pipe is connected to the throttle valve is on the one hand the environmental protection requirement, and on the other hand, the gas is drawn from the crankcase by the negative pressure of the intake air. When the oil-containing steam reaches the intake pipe, it will become cold. The oil will condense on the intake port and the throttle valve, and the accumulated carbon in the steam will also be deposited on these parts. Because the air flow through the throttle opening is the largest, the space is small. The gas temperature is also at the bottom, so this part is the most likely to condense.
Therefore, how long the throttle will be dirty depends on the quality of the air filter, the brand and quality of the oil used, the status of the driving route, the air temperature, the engine operating temperature, and driving habits. Even if the individual is not able to determine the cleaning throttle time by a fixed number of kilometers, the new car first purges the throttle with the longest interval, after which the cleaning frequency is increased due to the continuous condensation of oil and gas in the crankcase ventilation pipe and the intake port. It will increase, and different weather conditions will also affect the speed of throttle fouling.
Throttle cleaning
1. Effectively cleans and unclogs the gum and carbon deposit of the fuel injector to keep the fuel system clean.
2. It can clean the exhaust gas circulation system, reduce exhaust emissions, save fuel and effectively protect the oxygen sensor and the three-way catalytic converter.
3, can help prevent the colloid, carbon deposition-induced detonation, idling instability, acceleration and other symptoms.
4. It can eliminate the carbon deposit of the valve seat, lubricate the valve and valve guide, improve the seal, restore the cylinder pressure, and increase the power.
5. It can blow out the carbon deposit in the combustion chamber and lubricate the upper area of ​​the cylinder to reduce the wear of the piston ring and prolong its service life.
Editor's summary: The role of the throttle valve and the maintenance of the throttle are introduced here, and we hope to help everyone. If you want to know more related information, you can pay attention to this website information.
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