  Numerical methods are developed to solve the problem of abnormal changes of
current (conductivity) in polymer composite films which may be used as current,
pressure or temperature sensors. General nonlinear model includes the heat
equation, the nonlinear dependence of the resistivity of insulating composite
intervals on temperature, taking into account the dehydrochlorination reaction,
the appearance of conducting systems conjugated double bonds, and Ohm's law for
full control circuit net. The property of thermal conductivity equation to
smooth surges of source function allows to resolve the nonlinear closed system
and carry out calculations by successive small time steps. As a result of
numerical calculations we succeeded to explain and simulate virtually all
previously seemed anomalous phenomena including spontaneous transitions in the
highly conductive state, the conductivity jumps with temperature change, the
dependence on sample thickness, etc.
