Method and device for activating a valve of a fuel vapor retention system
AssigneeSiemens Aktiengesellschaft
InventorsWolfgang Ludwig, Wolfgang Mai, Jens Pache
Life of this patent
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Abstract
For the purposes of a determination of a fuel vapor loading level of a fuel vapor retention system of a combustion engine, an opening level of a valve of the fuel vapor retention system is increased in steps or continuously during a determination phase. Furthermore, the valve is activated at most a predefined first period prior to a start of the determination phase by a conditioning pulse at least whenever the valve was closed previously for a second period that is longer than a predefined threshold value. The conditioning pulse is generated in such a way that the valve definitely opens at most for a predefined opening period and then closes again.
Claims14
A method for activating a valve of a fuel vapor retention system of a combustion engine to determine a fuel vapor loading level of the fuel vapor retention system, comprising:
- activating the valve for a predefined first period prior to a start of a determination phase by a conditioning pulse at least whenever the valve had been closed for a second period that is longer than a predefined threshold value, the conditioning pulse is generated such that the valve opens for a predefined opening period and then closes;
- and
- increasing an opening level of the valve during the determination phase.
A device for activating a valve of a fuel vapor retention system of a combustion engine configured to determine a fuel vapor loading level of the fuel vapor retention system:
- an actuator for increasing an opening level of the valve during a determination phase;
- an activation device for activating the valve by a conditioning pulse for a predefined first period prior to a start of the determination phase at least whenever the valve is closed previously for a second period greater than a predefined threshold value;
- and
- a generating device that generates the conditioning pulse such that the valve opens at most for a predefined opening period and then closes.
Dependencies are inferred from the claim text.