Method for the diagnosis a tank ventilation valve

Details Method for the diagnosis a tank ventilation valve Method for the diagnosis a tank ventilation valve

2005-05-03

2005-05-03

McCall, Eric S. (Department: 2855)

Measuring and testing

Simulating operating condition

Marine

C073S114220

Reexamination Certificate

active

06886397

ABSTRACT:
A method is introduced for testing the operability of a tank vent valve between an internal combustion engine and a fuel vapor reservoir, in which the stored fuel vapor is supplied from the fuel vapor storage to the internal combustion engine when the tank vent valve is open, and in which the fuel vapor supply represents a first energy flow to the internal combustion engine, and in which air also flows to the internal combustion engine via a throttle valve, and, in which a second energy flow is assigned to this air, and in which an arrangement is provided which holds the sum of the two energy flows at a predefined value, and in which the tank vent valve is controlled in an opening manner, and in which a change in the energy flow delta E through the throttle valve, resulting from the opening control, is determined, and is compared to a predetermined threshold, and in which and a small change in the energy flow, which does not exceed the threshold value (threshold), is evaluated as a fault.

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