Abstract: To achieve a physical quantity detection device capable of obtaining a desired overall device accuracy without unnecessarily raising the tolerances of detection elements, the present invention is characterized by having a plurality of physical quantity detection units for respectively detecting plurality of physical quantities, a storage unit for storing the error characteristics of individual physical quantity detection units, a physical quantity calculation unit for using at least two physical quantities detected by at least two of the plurality of physical quantity detection units to calculate a separate physical quantity, and an error calculation unit for reading the error characteristics of the plurality of physical quantity detection units from the storage unit and calculating the error of the separate physical quantity.

Abstract: The purpose of the present invention is to reduce a load of preventing dew condensation, and to provide a highly reliable humidity detection device. In order to achieve the purpose, this humidity detection device is provided with: a humidity sensor having a humidity detection unit and a temperature detection unit; a heating resistor that heats the humidity sensor; and a heating control unit that controls a heating temperature of the heating resistor. The humidity detection device is characterized in having a target temperature storage unit that stores target temperatures of the heating resistor, said target temperatures having been determined corresponding to temperatures and humidities.

Abstract: In order to provide a humidity measuring device capable of determining whether or not a detection value by a humidity sensor is valid, a humidity measuring device of the present invention is a humidity measuring device for measuring humidity of the intake air in an internal-combustion engine, and includes a water droplet adhesion determination means for determining whether or not a water droplet adheres to a surface of a sensor element of a humidity sensor, based on changes in the humidity and the temperature of the intake air. Thus, it is possible to determine whether or not a detection value by the humidity sensor is valid.

Abstract: Provided is a physical quantity measuring device for reducing the influence of heat, other than the heat of a gas to be measured, on a measuring unit for measuring a physical quantity of the gas to be measured. The physical quantity measuring device according to the present invention includes a chip package 40 and a casing 11. The chip package 40 is molded from a polymeric resin, including first and second measuring units measuring first and second physical quantities of the gas to be measured, and a signal processing unit being connected to the first and second measuring units, and processing signals transmitted from the first and second measuring units, The casing 11 fixedly stores the chip package 40, and includes first and second bypass passages 12 and 14 allowing the gas to be measured taken from a main passage 70, to flow in the first measuring unit. In the chip package 40, the signal processing unit 44 is disposed between the first and second measuring units.