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AssigneeRobert Bosch GmbH
InventorsThorsten Fritz, Lutz Reuschenbach
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A method for checking the tightness of a tank-venting system of a vehicle wherein one introduces an overpressure or underpressure compared to the atmospheric pressure via a pressure source alternately into the tank-venting system and a reference leak of a defined size connected in parallel to the tank-venting system over a pregiven time interval and wherein one detects at least one operating characteristic variable of the pressure source when introducing the pressure into the tank-venting system (tank measurement) as well as when introducing the pressure into the reference leak (reference measurement) and wherein one compares the two measurements and, when there is a deviation of the tank measurement from the reference measurement by a pregivable value, one draws a conclusion as to a leak when there is a deviation of the tank measurement from the reference measurement by a pregivable value and the method is characterized in that one draws a conclusion as to the operability of the tank-venting valve of the tank-venting system from the time-dependent trace of the operating characteristic variable for the tank measurement.
Method for checking the tightness of a tank-venting system of a vehicle wherein one introduces an overpressure or underpressure compared to the atmospheric pressure by means of a pressure source alternately into the tank-venting system and a reference leak of a defined size connected in parallel to the tank-venting system over a pregiven time interval and wherein one detects at least one operating characteristic variable of the pressure source when introducing the pressure into the tank-venting system (tank measurement) as well as when introducing the pressure into the reference leak (reference measurement) and wherein one compares the two measurements and, when there is a deviation of the tank measurement from the reference measurement by a pregivable value, one draws a conclusion as to a leak when there is a deviation of the tank measurement from the reference measurement by a pregivable value and wherein one draws a conclusion as to the operability of the tank-venting valve of the tank-venting system from the time-dependent trace of the operating characteristic variable for the tank measurement.
Method for checking the tightness of a tank-venting system of a vehicle wherein one introduces an overpressure or an underpressure compared to the atmospheric pressure by means of a pressure source into the tank-venting system and wherein one detects at least one operating characteristic variable of the pressure source when introducing the pressure into the tank-venting system (tank measurement) and compares the measured operating characteristic variable to a threshold which is derived from operating variables of the control of an engine of a vehicle or is fixedly pregiven and concludes as to the presence of a leak when there is a deviation of the tank measurement from the threshold by a pregiven value and one draws a conclusion as to the operability of the tank-venting valve of the tank-venting system from the time-dependent trace of the operating characteristic variable during the tank measurement.
Dependencies are inferred from the claim text.