Method for diagnosing a tank venting valve
AssigneeRobert Bosch GmbH
InventorsStefan Salomon, Uwe Nusser
Life of this patent
Estimating the term…
Abstract
A method for diagnosing a tank venting valve. This includes measuring a first pressure p1 in the induction pipe of an internal combustion engine; activating the tank venting valve so as to open; measuring a second pressure p2 in the induction pipe of the internal combustion engine after the opening activation of the tank venting valve; calculating a control value K by subtracting the first induction pipe pressure p1 from a second induction pipe pressure p2 and adding a correction pressure pK, which is calculated from the leakage air adaptation of an internal combustion engine; and detecting A defect of the tank venting valve, when the control value K falls below a threshold value.
Claims5
A method for diagnosing a tank venting valve, the method comprising:
- measuring a first pressure p1 in the induction pipe of an internal combustion engine;
- activating the tank venting valve so as to open it;
- measuring a second pressure in the induction pipe of the internal combustion engine after the opening activation of the tank venting valve;
- determining a control value by subtracting the first induction pipe pressure from the second induction pipe pressure and adding a correction pressure, which is determined by multiplying the leakage air adaptation by the mass flow rate through a throttle valve, dividing it by a factor for converting charge to mass flow rate, and dividing it by a factor for converting pressure to charge in a system-based manner;
- and
- detecting a defect of the tank venting valve, if the control value falls below a threshold value.
A computer readable medium having a computer program, which is executable by a processor, comprising:
- a program code arrangement having program code for diagnosing a tank venting valve, by performing the following:
- measuring a first pressure p1 in the induction pipe of an internal combustion engine;
- activating the tank venting valve so as to open it;
- measuring a second pressure in the induction pipe of the internal combustion engine after the opening activation of the tank venting valve;
- determining a control value by subtracting the first induction pipe pressure from the second induction pipe pressure and adding a correction pressure, which is determined by multiplying the leakage air adaptation by the mass flow rate through a throttle valve, dividing it by a factor for converting charge to mass flow rate, and dividing it by a factor for converting pressure to charge in a system-based manner;
- and
- detecting a defect of the tank venting valve, if the control value falls below a threshold value.
A system for diagnosing a tank venting valve, comprising:
- a control arrangement, including a processor, for diagnosing the tank venting valve, by performing the following:
- measuring the a first pressure p1 in the induction pipe of an internal combustion engine;
- activating the tank venting valve so as to open it;
- measuring a second pressure in the induction pipe of the internal combustion engine after the opening activation of the tank venting valve;
- determining a control value by subtracting the first induction pipe pressure from the second induction pipe pressure and adding a correction pressure, which is determined by multiplying the leakage air adaptation by the mass flow rate through a throttle valve, dividing it by a factor for converting charge to mass flow rate, and dividing it by a factor for converting pressure to charge in a system-based manner;
- and
- detecting a defect of the tank venting valve, if the control value falls below a threshold value.
Dependencies are inferred from the claim text.