What is a car carbon canister
The carbon canister is usually installed between the gasoline tank and the engine. As gasoline is a volatile liquid, the fuel tank is often filled with vapor at normal temperature. The function of the fuel evaporation emission control system is to introduce the vapor into combustion and prevent it from evaporating into the atmosphere. The activated carbon tank storage device plays a crucial role in this process.
Because activated carbon has an adsorption function, when the car is running or off, the gasoline vapor from the fuel tank enters the upper part of the activated carbon canister through the pipeline, while fresh air enters the canister from the lower part. After the engine is turned off, gasoline vapor mixes with fresh air in the tank and is stored in the activated carbon canister. When the engine starts, the electromagnetic valve of the fuel evaporation purification device installed between the activated carbon canister and the intake manifold opens, and the gasoline vapor in the activated carbon canister is sucked into the intake manifold to participate in combustion.
Gasoline is a volatile fuel. The fuel in the fuel tank will evaporate quickly, increasing the pressure inside the tank. When the pressure reaches a certain value, it will cause certain dangers. Therefore, people tried to balance the pressure. At first, the fuel tank cap was made into a pressure-limiting valve. When the pressure exceeded a certain value, the pressure-limiting valve would open and release the gasoline vapor into the atmosphere. Later, From the perspective of fuel conservation and environmental protection, people have set up carbon canisters. The interior of the carbon canister is filled with highly adsorptive activated carbon. The excess fuel vapor in the fuel tank is no longer discharged into the atmosphere but is introduced into the activated carbon canister through a pipe. It is activated carbon that adsorbs fuel vapor. When the car is running, the solenoid valve of the activated carbon canister opens in a timely manner, reintroducing the absorbed fuel vapor into the intake manifold to achieve the purpose of fuel conservation and environmental protection.
When the engine is not idling, a "tap-tap" sound can be heard from time to time. Don't panic when encountering such a situation. The first thing to do is to find the carbon canister solenoid valve in the car and determine if the "dada" sound is coming from it. If so, just ignore it. Because when the throttle is opened, the carbon canister solenoid valve will produce intermittent on-off actions and make sounds, and this is a normal phenomenon.
When you step on the accelerator and brake the car, there is a strong smell of oil inside
If you encounter a problem where the car stalls when you step on the accelerator to accelerate and there is a strong smell of gasoline inside, you should pay special attention to whether the pipelines in the carbon canister system are damaged. Gasoline vapor will be directly discharged into the atmosphere along the damaged area, causing a strong smell of gasoline inside the vehicle. If at this time the pipeline leaks oil, causing air instead of fuel vapor to enter the engine intake passage, it will inevitably lead to an overly lean engine mixture, thereby causing the engine to stall at irregular intervals.
The idle speed of the engine fluctuates and the acceleration is weak
If the engine starts and the idle speed fluctuates regularly and the car has weak acceleration, it is necessary to pay attention to whether it is caused by the blockage of the air inlet of the carbon canister and the filter screen. Because at this time, it is difficult for outside air to enter the carbon canister, and there is a lack of fresh air inside the canister. At idle speed, under the effect of the intake vacuum suction force, the gasoline vapor adsorbed in the activated carbon canister is sucked into the intake manifold, causing the oxygen sensor to detect that the mixture is too rich. As a result, the engine control unit reduces the amount of fuel injectors, and the concentration of the combustible mixture decreases accordingly, leading to a lower idle speed. Subsequently, due to the reduction in fuel injection volume, the oxygen sensor detected that the mixture was too lean in the next cycle. As a result, the computer increased the fuel injection volume again, causing the idle speed to continue to rise. Therefore, the phenomenon of the idle speed fluctuating regularly occurred. So, when such a situation occurs, the car owner should promptly check whether the air intake of the carbon canister is unobstructed.
The engine has stalled or is difficult to start
At this point, it is necessary to pay attention to checking the carbon canister solenoid valve that may cause problems. If the solenoid valve remains closed all the time, the gasoline vapor in the carbon canister will accumulate more and more, eventually filling the entire carbon canister. The remaining gasoline vapor can only escape into the atmosphere, polluting the environment and wasting fuel. Conversely, if the solenoid valve remains open all the time, the mixture in the engine's intake port will be constantly enriched. At the same time, since the engine control unit has not yet controlled the carbon canister solenoid valve to work, it will not issue a command to reduce the fuel injection volume. This will cause the mixture to be too rich when the engine is warm, leading to engine stalling, as well as making it difficult to start after the engine is warm and stalling.
The second point that car owners should pay attention to is not to fill up the tank too full each time. Remember to fill up slowly when it's almost full. Overfilling can easily cause gasoline to enter the pipelines of the activated carbon canister system. The entry of these liquid fuels into the carbon canister not only poses a threat to the canister itself but also flows through the pipelines into the intake passage, causing the spark plugs to "drown", resulting in serious consequences such as the car stalling upon refueling and eventually being unable to start. If you refuel too quickly, if the expanding steam and the gas released by the gasoline cannot be released in time, it will cause oil choking.
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