FUEL VAPOR RECOVERY METHOD Russian patent published in 2019 - IPC F02M25/08 

FIELD: machine building.

SUBSTANCE: invention relates to transport and power engineering when using internal combustion engines. Method of fuel vapor recovery from fuel tank mainly for vehicles, consisting in supply of fuel vapors into internal combustion engine, wherein the fuel vapor pressure in the fuel tank is measured and the measured fuel vapor pressure in the fuel tank is compared to the first and second control pressures, wherein the second control pressure is greater than the first reference pressure, when the second reference pressure is exceeded, the fuel vapor is fed into the internal combustion engine and the main fuel consumption is reduced by the fuel vapor consumption value, and when the fuel vapor pressure in the fuel tank drops below the first reference pressure, supply of fuel vapors into the internal combustion engine is switched off. So, according to the invention, in order to increase efficiency and safety of vehicles by using combustion energy of fuel vapors in the operating cycle of the internal combustion engine, the first and second control fuel vapor pressures are varied depending on external conditions – pressure and ambient temperature, wherein with increasing ambient temperature or decreasing ambient pressure value, second control pressure of fuel vapors is reduced, and with decreasing ambient temperature or increasing ambient pressure second control pressure of fuel vapors is increased, wherein the second fuel vapor control pressure does not exceed the maximum operating pressure in the fuel tank, and the difference between the second and first control fuel vapor pressures remains constant.

EFFECT: invention increases efficiency of using fuel vapors during operation of an internal combustion engine, increases safety, and also reduces harmful emissions to atmosphere in the form of fuel vapors and toxic components on exhaust.

10 cl, 4 dwg