Method for operating a hybrid vehicle
AssigneeDr. Ing. h.c. F. Porsche Aktiengesellschaft
InventorsChristoph Baumann, Thomas Rauner, Stefan Fischer
Life of this patent
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Abstract
A method is provided for operating a hybrid vehicle (1) having an internal combustion engine (2), an electric machine (4) and having a regenerable filter device that absorbs fuel vapors from a fuel tank of the internal combustion engine. To improve the reproducible operation of a hybrid vehicle with an internal combustion engine and an electric machine, in a purely electric driving mode in which the hybrid vehicle (1) is driven only by the electric machine (4), the regenerable filter device is rinsed by switching on the internal combustion engine (2) with a scavenging strategy that is dependent on the velocity of the hybrid vehicle (1).
Claims9
A method for operating a hybrid vehicle having an internal combustion engine, an electric machine, a fuel tank and a regenerable filter device that absorbs fuel vapors from the fuel tank of the internal combustion engine, the method comprising:
- defining a range of speeds of the vehicle at which noise associated with operating the internal combustion engine is not accoustically objectionable;
- driving the vehicle exclusively by the electric machine in a purely electric driving mode while keeping the internal combustion engine switched off;
- absorbing fuel vapors from the fuel tank in the regenerable filter device while operating the vehicle in the purely electric driving mode;
- measuring a charge state of the regenerable filter device;
- measuring vehicle speed while driving the vehicle in the purely electric driving mode;
- and
- switching on the internal combustion engine for rinsing the regenerable filter device and combusting the fuel vapors absorbed therein if the charge state of the regenerable filter device is above a desired low level and the speed of the vehicle is in the defined range of speeds at which noise associated with operating the internal combustion engine is not accoustically objectionable.
Dependencies are inferred from the claim text.