48results about How to "Reduce offset error" patented technology

The invention provides a pit structure mounting method which comprises the following steps: supplying a second upright column, and embedding the second upright column into the bottom of a foundation pit; supplying a bottom plate, and arranging the bottom plate at the bottom of the foundation pit to cover the second upright column; supplying a first upright column, enabling the first upright column to penetrate through the bottom plate, and inserting the first upright column into the second upright column; supplying a supporting plate, and horizontally arranging the supporting plate at the top end of the first upright column; fixedly arranging a pit bearing platform on the top of the supporting plate; and supplying a connecting mechanism, and fixedly connecting the connecting mechanism with the top of the pit bearing platform. When the pit structure mounting method is used for excavating the foundation pit, a fixing mechanism is arranged in a reserved space at the lower part of the pit bearing platform, and the pit bearing platform is supported by the supporting plate, so that the lower part of the pit bearing platform is effectively supported, steadiness of the pit structure mounting method is guaranteed, the pit is prevented from collapsing, the safety hidden dangers are eliminated and the like.

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.

The invention provides a pit structure mounting method. The pit structure mounting method comprises the following steps: providing a foundation pit, pouring concrete into the foundation pit, and setting up a first bearing platform; providing multiple supporting rods, and fixedly connecting the bottom ends of multiple supporting rods with the first bearing platform; providing a second bearing platform, and fixedly connecting the second bearing platform with the top ends of multiple supporting rods; providing a pit connecting frame, and fixedly connecting the pit connecting frame with the top of the second bearing platform; and pouring the concrete into the foundation pit, so that a concrete surface covers the pit connecting frame. The pit structure mounting method has the advantages that the second bearing platform and the supporting rods connecting the first bearing platform and the second bearing platform are additionally arranged on the first bearing platform, and each supporting rod has a telescopic structure, so that the levelness of the second bearing platform can be adjusted, and the problems that the foundation pit is sunken and the bearing platforms are deformed as an elevator pit structure is used for too long time can be solved.

The invention discloses a centering positioning device suitable for vehicle indoors with different internal widths, and belongs to the field of positioning devices of central planes of the indoor transverse width of railway vehicles. The centering positioning device comprises a four-wheel trolley, a door-shaped frame, two sets of vertical slide rail mechanisms, a vertical lifting screw rod mechanism and a wide-direction central plane centering system, wherein the wide-direction central plane centering system comprises a vertical lifting platform and a horizontal centering mechanism, and the door-shaped frame comprises a horizontal cross beam and two vertical stand columns which are integrally formed. According to the centering positioning device, the problems that the operation process iscomplex, the workload is large, the surveying and mapping efficiency is low and the universality is low due to the fact that a traditional surveying and mapping method used the modes of measuring by adrawing ruler and marking and scribing by a mark pen to determine the center plane in the width direction of the vehicle indoor are overcome, so that deviation errors caused by measuring by the ruleand scribing on the center of all parts of a vehicle are reduced, the quality problems that the center is inaccurate and the position is offset existing in the aspect of vehicle body manufacturing areeffectively solved, and size precision, the assembling quality and the working efficiency in the overall assembly construction process of the urban rail vehicle body are improved.

The invention relates to a LVDS receiving circuit with adjustable input resistance. Under the standard LVDS signal input, the LVDS receiving circuit is equipped with an ESD protection module, an adjustable matching resistance module and a signal conversion module. Under the input current, by receiving different control signals and selecting different input resistances to generate a suitable voltage for the next recovery comparator, due to the adjustable input resistance technology, by selecting different resistances, the receiver can be used in different input work normally under current. This technology can not only expand the application occasions of LVDS receivers, but also realize the function of impedance matching in the case of high-speed signal input. The structure of the whole circuit is symmetrical, which facilitates the design of the back-end layout. The whole circuit can be regarded as a Independent functional modules are used in various systems.