Fuel system

摘要

A fuel system (1a, 1b, 1c, 1d, 1e, 1f) for a motor vehicle internal combustion engine, having a fuel tank (2) with a fuel vapor venting path (4) containing an activated carbon filter (3), in which a fresh air stream (7) blown or sucked in the direction of the tank venting valve (6) by an independent pump unit (5) arranged close to the activated carbon filter (3) can be made to flow through the activated carbon filter (3), at least at the periphery thereof and, in that case, preferably at the fresh air side to regenerate said filter.

主权项

1. A fuel system for a hybrid motor vehicle having an internal combustion engine, comprising:
a fuel tank; a fuel vapor venting path communicating with the fuel tank and containing an activated carbon filter; a purging path extending from the activated carbon filter to the internal combustion engine; a tank ventilating valve in the purging path between the activated carbon filter and the internal combustion engine; a condenser unit in the purging path between the activated carbon filter and the tank ventilating valve; a return line extending from the condenser unit to the fuel tank; an independent pump unit arranged close to the activated carbon filter and operative to urge a stream of fresh air through at least a periphery of the activated carbon filter and toward the tank venting valve to regenerate said filter; and a control unit connected at least to the pump, the condenser unit and the tank venting valve, the control unit being operative to operate the pump and the tank ventilating valve to purge the activated carbon filter under specified load states of the activated carbon filter when the internal combustion engine is operating and to operate the pump and the condenser unit to purge the activated carbon filter under specified load states of the activated carbon filter when the internal combustion engine is not operating.