A motor-incorporated hypocycloid-type speed reducer includes: a motor housed in a case; a first larger internal gear; a second smaller internal gear coaxial with a motor shaft; an output shaft coaxial with the motor shaft, the output shaft being provided with the second internal gear; and an external gear. The inflow tube is divided into a plurality of inflow auxiliary tubes, and the outflow tube is divided into a plurality of outflow auxiliary tubes, with all auxiliary tubes encased in a single external tube. According to the Invention the solid, metallic cell body support the corresponding strain gage. The heat from the furnace is used as intended, the stream is conditioned, and ultimately proceeds to a downstream RTO. When the abnormality is not detected, primary abnormality processing is released and an electronic control at normal time of the engine control apparatus is executed.