METHOD AND DEVICE FOR CONTROLLING THE FUEL SUPPLY OF AN INTERNAL COMBUSTION ENGINE OPERATED WITH LIQUEFIED GAS

摘要

The invention relates to methods and to devices for controlling the fuel supply of an internal combustion engine (10) operated with liquefied gas as a fuel, wherein the liquefied gas is conveyed from a reservoir (14) containing the liquefied gas to a high-pressure fuel accumulator (19) by means of a low-pressure fuel pump (15) and a high-pressure fuel pump (17) arranged downstream of the low-pressure fuel pump (15), said high-pressure fuel accumulator having a flow connection to individual fuel injectors (Z1-Z4) associated with the respective cylinders (Z1-Z4) of the internal combustion engine (10), such that liquefied gas is injected directly into the combustion chambers of the cylinders (Z1-Z4) as needed. The fuel pressure (pR) and/or the fuel temperature (TR) in the high-pressure fuel accumulator (19) are detected, and if specified limits for the fuel pressure (pR) and/or for the fuel temperature (TR) are exceeded, a return line (22) that connects the high-pressure fuel accumulator (19) to the reservoir (14) is opened by means of an electrically controllable shut-off valve (23), such that at least a partial flow of the liquefied gas flows back to the reservoir through the high-pressure fuel accumulator (19) as a flushing flow. Vapor bubbles occurring due to high temperature or pressures can thus be reliably and easily removed from the high-pressure fuel accumulator (19).