SYSTEM FOR LEAK DETECTION OF EGR LOW PRESSURE CIRCUIT OF INTERNAL COMBUSTION ENGINE Russian patent published in 2019 - IPC F02D41/00 

FIELD: internal combustion engines.

SUBSTANCE: invention relates to internal combustion engines equipped with at least one low-pressure exhaust gas recirculation channel. Result is achieved due to detection of leakage / malfunction of low pressure system EGR detection system (RL) of internal combustion engine, by performing method comprising following steps - (step 1) obtaining the value of lambda measured at the exhaust (λ_measured) by said third measurement or evaluation means (λ and/or NOx), - (step 2) calculation of theoretical value (λ_exp) of said air-to-fuel ratio, calculated based on said measured or estimated amount of fresh air () and fuel (), - (stage 3) calculation of error (λ_err) between said measured and theoretical values of air to fuel ratio (λ_measured−λ_exp), - (step 4) calculating / estimating amount / flow of low-pressure recycled exhaust gas (), - (step 5) calculating the linear regression from said recirculated exhaust gas amount () and said error (λ_err),- (step 6) the leak / fault signaling on said low pressure EGR circuit when the angular coefficient (b) of said linear regression exceeds a predetermined first positive threshold value (b_max).

EFFECT: technical result is providing a system capable of monitoring the possible supply of fresh air into/through the low pressure EGR channel of an internal combustion engine of the type and without supercharging, and with supercharging.

14 cl, 2 dwg