Tank ventilation with a venturi nozzle

摘要

A tank ventilation system of a motor vehicle includes a vapor filter, a first line connecting the vapor filter at a corresponding first introduction point to a suction pipe, and a second line connecting the vapor filter at a corresponding second introduction point to an environment line. The second introduction point is arranged between an air filter and a compressor of the environment line. The second line includes a Venturi nozzle configured to remove carrier flow from downstream of the compressor and upstream of the throttle valve.

主权项

1. A method of controlling a tank ventilation system, the method comprising:
providing a tank ventilation system including:
a vapor filter,a first line connecting the vapor filter at a corresponding first introduction point to a suction pipe,a second line connecting the vapor filter at a corresponding second introduction point to an environment line, the second line including:
a Venturi nozzle with an inlet end connected to the environment line upstream of a throttle valve and downstream of a compressor, and an outlet end connected to the environment line so as to form the second introduction point upstream of the compressor and downstream of an air filter, such that operation of the compressor results in a pressure differential that conducts carrier flow through the Venturi nozzle, the Venturi nozzle having a restricted section through which movement of the carrier flow results in a reduced pressure, anda removal pipe in communication with the vapor filter and connected to the constricted section of the Venturi nozzle such that the reduced pressure resulting from the carrier flow causes fluid from the vapor filter to pass through the removal pipe and the outlet of the Venturi nozzle to the environment line at the second introduction point; conveying an air flow through the tank ventilation system so as to purge the vapor filter; measuring pressure values including at least one of:
pressure upstream of the compressor,pressure downstream of the compressor,pressure differential between a negative pressure in the suction pipe and environment, andambient pressure; and calculating, using a computer, a path of the air flow purging the vapor filter based on the measured pressure values.