METHOD OF LOCOMOTIVE DIESEL DIAGNOSTICS Russian patent published in 2014 - IPC G01M15/05 G01M15/09 

FIELD: engines and pumps.

SUBSTANCE: diagnostics is carried out in operation of locomotive diesel. Proposed process consists in measurement of differential pressure at oil coarse strainer and definition of diesel crankshaft bearing wear and fouling. Filter clogging is defined by comparison of measured differential pressure with preset threshold taken as the differential pressure at said strainer of a new diesel with fresh filter. In case measured differential pressure exceeds said preset threshold message on strainer clogging is generated. Wear of diesel crankshaft bearing wear is defined at no crossing of differential pressure threshold at said strainer. For this, at least three differential pressure measurements are made for different diesel crankshaft rpm by formula I=100(k-k₀)/(k_max-k₀), %, where I is bearing wear in percentage, k, k₀ and k_max are factors defined for diesel under diagnostics, fresh diesel and diesel with maximum permitted wear diesel crankshaft bearing, respectively. In case calculated wear of diesel crankshaft bearing exceeds the preset threshold message about diesel emergent state is generated. Note here that magnitude of factor k is defined by the following formula: $$k=({\displaystyle \sum p_{"н"}^{(i)}/{\displaystyle \sum p_{"д"}^{(i)}}})-\mathrm{1,}$$ where $$p_{"н"}^{(i)}$$ is the pressure upstream of oil strainer for i^th measurement, $$p_{"д"}^{(i)}$$ is the pressure downstream of said strainer for i^th measurement.

EFFECT: continuous automatic diagnostics without dismantling and mothballing.

2 dwg