摘要:
A procedure for diagnosing a tank system of a vehicle with at least two controllable tank ventilation valves, with at least two points of release for a tank ventilation mixture, whereby at least a first point of release runs into an inlet manifold of a combustion engine downstream of a throttle device and at least a second point of release is arranged in an inlet manifold of the combustion engine upstream of the throttle device, especially upstream of a compressor, is thereby characterized, in that for diagnosing the functionality of the tank ventilation system the at least two tank ventilation valves are controlled independently of each other and its functionality can be implied due to the pressure that occurs in the tank system.
摘要:
A procedure to diagnose a fuel tank ventilation system of a motor vehicle and a device to implement the procedure are proposed. The fuel tank ventilation system contains at least one first ventilation pathway discharging into the air intake area of the internal combustion engine downstream behind a supercharger as well as at least one second ventilation pathway discharging into the air intake area upstream in front of the supercharger. Provision is made for a diagnosis with at least two partial diagnoses, whereby the first partial diagnosis pertaining to the first ventilation pathway is implemented, if the intake manifold pressure in the discharge area of the first ventilation pathway is smaller than the fuel tank system pressure; and the second partial diagnosis pertaining to the second ventilation pathway is implemented, if the intake manifold pressure in the discharge area of the first ventilation pathway is greater than the fuel tank system pressure. An error signal is provided, if at least one of the partial diagnoses generates a partial error signal.
摘要:
A method is provided for diagnosing the operability of fuel vapor intermediate stores (4), in particular of activated carbon filters, in tank-venting systems with at least one tank (3) and at least one fuel vapor intermediate store (4). In this case an actual change degree of filling of the fuel vapor intermediate store (4) is determined as a consequence of absorption or desorption processes of gaseous hydrocarbons in the fuel vapor intermediate store (4). The actual change in degree of filling is compared with a desired change in degree of filling and, from the comparison, a conclusion about the operability of the fuel vapor intermediate store (4) is drawn.
摘要:
A method is provided for diagnosing the operability of fuel vapor intermediate stores (4), in particular of activated carbon filters, in tank-venting systems with at least one tank (3) and at least one fuel vapor intermediate store (4). In this case an actual change degree of filling of the fuel vapor intermediate store (4) is determined as a consequence of absorption or desorption processes of gaseous hydrocarbons in the fuel vapor intermediate store (4). The actual change in degree of filling is compared with a desired change in degree of filling and, from the comparison, a conclusion about the operability of the fuel vapor intermediate store (4) is drawn.
摘要:
A procedure to diagnose a fuel tank ventilation system of a motor vehicle and a device to implement the procedure are proposed. The fuel tank ventilation system contains at least one first ventilation pathway discharging into the air intake area of the internal combustion engine downstream behind a supercharger as well as at least one second ventilation pathway discharging into the air intake area upstream in front of the supercharger. Provision is made for a diagnosis with at least two partial diagnoses, whereby the first partial diagnosis pertaining to the first ventilation pathway is implemented, if the intake manifold pressure in the discharge area of the first ventilation pathway is smaller than the fuel tank system pressure; and the second partial diagnosis pertaining to the second ventilation pathway is implemented, if the intake manifold pressure in the discharge area of the first ventilation pathway is greater than the fuel tank system pressure. An error signal is provided, if at least one of the partial diagnoses generates a partial error signal.
摘要:
In a procedure for the functional diagnosis of an activateable fuel tank ventilation valve of the fuel tank system of an internal combustion engine, especially of a motor vehicle, whereby in specifiable time intervals when the fuel tank ventilation valve is activated to open, regeneration gas is added to the air drawn into the combustion chamber, whereby fuel is delivered to the combustion chamber, whereby the fuel, the air, respectively the fuel, the air and the regeneration gas are combusted in the combustion chamber and whereby by comparison of at least one operating parameter, which characterizes the combustion of fuel and intake air with the corresponding operating parameter, which characterizes the combustion of fuel, intake air and regeneration gas, inference can be made about the functional capability of the fuel tank ventilation valve, the HC-concentration of the regeneration gas is specifically affected by changing the regeneration gas stream.
摘要:
In a procedure for the functional diagnosis of an activateable fuel tank ventilation valve of the fuel tank system of an internal combustion engine, especially of a motor vehicle, whereby in specifiable time intervals when the fuel tank ventilation valve is activated to open, regeneration gas is added to the air drawn into the combustion chamber, whereby fuel is delivered to the combustion chamber, whereby the fuel, the air, respectively the fuel, the air and the regeneration gas are combusted in the combustion chamber and whereby by comparison of at least one operating parameter, which characterizes the combustion of fuel and intake air with the corresponding operating parameter, which characterizes the combustion of fuel, intake air and regeneration gas, inference can be made about the functional capability of the fuel tank ventilation valve, the HC-concentration of the regeneration gas is specifically affected by changing the regeneration gas stream.
摘要:
A method for operating a fuel vapor recirculation system in a motor vehicle having a fuel tank. In the method, in the operating strategy of the fuel vapor recirculation system, predictive route data of the motor vehicle are taken into account.
摘要:
For determination of the bandwidth of optical fibers, the invention proposes a method which comprises the injection of light at a first optical power level and at a first frequency into an optical fiber, as well as the measurement of a first signal level as a function of the optical power level of the light passing through the fiber at the first frequency, the injection of light at the second optical power level and at a second frequency into the optical fiber, the measurement of a second signal level as a function of the optical power level of the light passing through the fiber at the second frequency, and the determination of the bandwidth of the fiber as a function of the first and second optical power levels and/or of the measured first and second signal levels using a predetermined rule which describes the frequency-dependant attenuation response of the fiber.
摘要:
In a venting system, in particular for a fuel tank of a motor vehicle, which has a sorption filter for temporarily storing fuel evaporating from the fuel tank and a fluid-conveying conveying device situated between the sorption filter and an air supply or an intake manifold of an internal combustion engine, according to the present system, the conveying device is a bidirectional conveying device which is switchable in a first conveying direction in the direction of the internal combustion engine for regenerating the sorption filter and in a second conveying direction in the direction of the sorption filter for carrying out a fuel tank leak diagnosis.