87results about How to "The detection value is accurate" patented technology

An electric power steering apparatus includes a first torque calculating unit for calculating a first torque command based on a steering torque detected by the steering torque detecting unit, a second torque command calculating unit for calculating a second torque command based on the wheel rotation speed, an emergency switching unit for outputting the second torque command instead of the first torque command when error of the rotation torque is detected, a wheel rotation speed error detecting unit for detecting an error of the wheel rotation speed based at least on the wheel rotation speed, the steering torque in a normal state and the motor rotation information, and an emergency command limiting unit for liming the second torque command when normal and the motor rotation information, and where error of the wheel rotation speed is detected, when the second torque command is selected by the emergency switching unit.

A support shaft of a spindle unit having a through hole in which wires are laid has a structure that can obtain much spatial room so as to prevent a break in cables and to be compatible with a high-output spindle motor. A machine-tool spindle head 1 includes a support head 6 that drives a spindle unit 4 for indexing around a turn axis (A-axis) of the spindle unit 4 by rotatably supporting a pair of support shafts 9 coupled to the spindle unit 4 on the A-axis by a pair of fork arms 7 and bearings 13. The pair of support shafts 9 have through holes 12 in which a plurality of wires 22 extending from the spindle unit 4 are laid, the plurality of wires 22 are divided into two wire groups, and the wire groups are separately laid in the pair of support shafts 9.

A pressure sensor having a structure in which compressible fluid is prevented from stagnating in the vicinity of a pressure-receiving surface of the pressure sensor in the interior of a pressure introducing portion is provided. In a pressure sensor including a sensor body arranged in a pressure introduction flow channel branched in a T-shape upward from a primary fluid flow channel in which fluid to be subjected to pressure measurement flows, the pressure introduction flow channel includes an inclined surface extending in a direction to increase an opening area on the side of an inlet port of the fluid on a wall surface on the downstream side in terms of the direction of flow of the fluid.

The invention relates to the technical field of track flaw detection and displacement sensors, and particularly relates to an automatic centering system used for track flaw detection and a centering detection method thereof. The automatic centering system comprises a control module and a laser detection module which is arranged on a wheel detector. The laser detection module comprises multiple laser switches which are equidistantly arranged. Each laser switch irradiates laser beams to the track, and the laser beams are mutually parallel and perpendicular to the track. The laser switches which irradiate to the track and the laser switches which do not irradiate to the track transmit different state values to the control module. The control module calculates the transverse deviation value of the laser detection module relative to the edge of the track according to the state values of all the laser switches. The track is detected by using the laser switches arranged in a spaced way, and the transverse deviation value of the wheel detector relative to the edge of the track is calculated through different state values obtained by the laser switches which irradiate to the track and the laser switches which do not irradiate to the track so that the calculation method is simple, the detection value is accurate, the reliability is high, the stability is high and the real-time performance is great.

An information recording apparatus includes:a recording device capable of recording information into a data area of an information recording medium, by irradiating laser light, in conformity with a predetermined error correction method; an optimum-recording-power detecting device for obtaining an optimum recording power of the laser light, by recording test writing data into a data area portion with a length which is equal to or less than an allowable defect length in the predetermined error correction method, within the data area, by using the recording device; and a controlling device for controlling the recording device to record the information into the data area with the obtained optimum recording power.

The invention provides a safety valve performance online detection device. The safety valve performance online detection device comprises an operation piano-type cabinet and a mechanical operation platform; the operation piano-type cabinet is provided with a display, a keyboard, a mouse and a power source switch; an electrical control system is arranged in the operation piano-type cabinet; the electrical control system comprises a host computer as well as a PLC and an NI data acquisition card which are both electrically connected with the host computer; the electrical control system further comprises a switching quantity unit, a pressure regulating valve, an inlet pressure sensor and an outlet pressure sensor which are all electrically connected with the PLC; and the electrical control system also comprises an electronic scale, a test pressure sensor, a temperature sensor, a displacement sensor and a flow sensor which are all electrically connected with the NI data acquisition card. With the safety valve performance online detection device of the invention adopted, various kinds of performance parameters of safety valves can be detected precisely and automatically.

A temperature detection cell includes a circuit for producing a voltage that increases with temperature, a circuit producing a voltage that decreases with temperature, and a comparison circuit to compare the increasing voltage with the decreasing voltage. The comparison circuit produces a warning signal when the temperature reaches a detection threshold such that the decreasing voltage becomes lower than the increasing voltage. The cell also has a test circuit to determine the detection threshold of the cell. Also disclosed is a method for testing a temperature detection cell, during which the detection threshold of a cell is determined from measurements of the increasing voltage and the decreasing voltage at a reference temperature.

A sensing circuit includes a first sensing element, a second sensing element, a reduction unit, a storage unit, a specifying unit and a detection unit. The reduction unit reduces the amount of the energy applied to the second sensing element. The storage unit stores a degradation characteristic of the sensing element. The specifying unit specifies a rate of degradation. The detection unit detects the amount of the energy on the basis of the rate of degradation.

The invention discloses a device for testing material property of a hemiconical block of an air valve. In structure, the device comprises a stretcher, a valve rod and a conical block seat, wherein the stretcher comprises a cylindrical hydraulic cylinder, which consists of an upper part of the hydraulic cylinder and a lower part of the hydraulic cylinder; the upper part of the hydraulic cylinder and the lower part of the hydraulic cylinder are respectively provided with a quick joint; the conical block seat is in a convex shape, and an obconical through hole is formed at the centre of the conical block seat; the conical block seat is connected with the top of the hydraulic cylinder; and a hemiconical block is mounted at the upper part of the valve rod, and the lower part of the valve rod is connected with a piston in the hydraulic cylinder. Hydraulic oil is injected through the upper and lower quick joints, so as to control the stretcher to ascend or descend, and further control the valve rod to ascend or descend.