Patent ID: 9026399
Filing Date: 2015-05-05
Classification: F02D,Y02T

Abstract:
1. An apparatus for detecting abnormality of sensors comprising an intake passage of an engine for intake of air from a compressor via an intercooler into an intake manifold, an EGR passage for returning an EGR gas from an exhaust passage to the intake passage of the engine through an EGR cooler and an EGR valve, an intake-air temperature sensor in the intake passage upstream of the compressor for detecting a temperature of intake air to the engine, an intercooler outlet temperature sensor in the intake passage downstream of the intercooler and before an outlet of the EGR passage for detecting an outlet temperature of the intercooler, and an intake manifold temperature sensor in the intake passage between the outlet of the EGR passage and the intake manifold for detecting a temperature of the intake manifold, the apparatus being configured to compare temperatures of the intake-air temperature sensor, the intercooler outlet temperature sensor and the intake manifold temperature sensor in cold time of the engine to determine that when one of the sensors is at a different temperature, the sensor at the different temperature has a characteristic abnormality, to obtain a first temperature difference from temperatures of the intercooler outlet temperature sensor before and after increase in boost pressure to determine that the intercooler outlet temperature sensor has a characteristic abnormality when the first temperature difference is smaller than a first reference limit, and to obtain a second temperature difference from temperatures of the intake manifold temperature sensor and of the intercooler outlet temperature sensor after opening the EGR valve to determine that the intake manifold temperature sensor has a characteristic abnormality when the second temperature difference is smaller than a second reference limit, wherein the presence or absence of a characteristic abnormality in the intake-air temperature sensor, the intercooler outlet temperature sensor and the intake manifold temperature sensor are continuously detected.