68results about How to "Reduce output error" patented technology

The invention provides a variable arm articulated coordinate measuring machine provided with a magneto-electric locking arm apparatus. The variable arm articulated coordinate measuring machine comprises fix rotatable joints, three segments of measuring arms, a base and a gauge head. The six rotatable joints connected in series through the three segments of the measuring arms form a space open chain structure, and the tail end of the open chain structure is the gauge head of the measuring machine. From the base, a first-order joint and a second-order joint are internally provided with joint locking assemblies, and the joint locking assemblies are electromagnetic joint lock assemblies. According to the invention, in the joint locking assemblies of the articulated coordinate measuring machine based on an electromagnetic technology, additional arrangement of machinery structures is unnecessary, no influences are exerted on the mechanical distribution of the measuring machine, after the joints are locked, the number of sensors for dynamic output is reduced, the rotation of an angle sensor is restricted, the output errors of the angle sensor are reduced, and the measuring precision is improved.

The invention discloses a nitrogen oxide sensor controller. The nitrogen oxide sensor controller comprises a heater resistance measuring circuit, a micro-control unit, a heating driving circuit, a first pump current detection circuit, a second pump current detection circuit, a third pump current detection circuit, a first pump voltage control circuit, a second pump voltage control circuit and a third pump voltage control circuit. The sensor heater resistance is measured by the heater resistance measuring circuit, and the control and the detection of pumps are achieved by the three independentpump voltage control circuits and the three independent pump current detection circuits. A microcontroller conducts operation treatment on acquired heater resistance signals and acquired pump currentdetection signals, and heating control signals, pump voltage control signals, output oxygen concentration signals and nitrogen oxide concentration signals are obtained. By the adoption of the nitrogenoxide sensor controller, the accurate measurement of the heater resistance of a nitrogen oxide sensor is achieved, the temperature control accuracy of the sensor is improved, the control over pump units of the nitrogen oxide sensor and the accurate measurement of the pump current signals are achieved on this basis, and the accuracy of detection conducted by the nitrogen oxide sensor on the concentration of oxygen and the concentration of the nitrogen oxide in the automobile exhaust gas is improved.