Control method and system for washing carbon tank

Abstract

The invention discloses a control method for washing a carbon tank. The method comprises the steps of acquiring a carbon tank load value of the target carbon tank; comparing the carbon tank load valuewith a carbon tank load target value; increasing a first target idling speed of the target carbon tank to a second target idling speed when the carbon tank load value is greater than the carbon tankload target value; and washing the target carbon tank on the basis of the second target idling speed. According to the control method, by comparing the carbon tank load value with the carbon tank loadtarget value corresponding to the carbon tank load value, when the carbon tank load value is greater than the carbon tank load target value, the first target idling speed of the target carbon tank isincreased to the second target idling speed, and the target carbon tank is washed on the basis of the second target idling speed. The idling speed of washing the carbon tank is increased, and the problems are solved that that since closed-loop feedback of an oil channel has a certain lag, a certain impact is caused on the air-fuel ratio and idling speed, and when the idling speed is low, due to the severely-changed idling speed, flameout occurs.

Description

technical field [0001] The invention relates to the technical field of automobile engines, in particular to a control method and system for flushing a carbon canister. Background technique [0002] With the increase of environmental protection, the emission standards for automobiles are becoming more and more stringent. The oil vapor evaporated from the fuel tank cannot be directly discharged into the atmosphere, but is absorbed in a carbon tank filled with activated carbon. In order to prevent oil The steam overflows from the atmospheric port of the activated carbon tank, and the carbon tank flushing system desorbs it through fresh air. The desorbed gas contains hydrocarbon (HC) components, and this part of the gas is called flushing gas flow. After the flushing gas flow enters the intake manifold, the hydrocarbon (HC) components in it will enter the cylinder and be burned. [0003] Under the strict requirements of the National VI evaporative emission regulations, the carb...

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Problems solved by technology

[0004] In view of this, the present invention provides a carbon canister flushing control method and system to solve the problem in the prior art that these extra hydrocarbon (HC) components participate in the combustion and there is a certain hysteresis in the closed-loop feedback of the oil circuit. It has a certain impact on the air-fuel ratio and speed. When the idle speed is low, the speed shakes seriously and even causes the problem of flameout.

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