212 results about "Specific rotation" patented technology

A variable valve timing control apparatus adjusts the rotation phase (VCT phase) of an engine camshaft by selectively supplying oil to an advancement chamber and a retardation chamber, and includes a lock pin which is controlled for being moveable to a first position, in which the rotation phase is adjustable, and a second position, in which the camshaft is locked at a specific rotation phase. When the lock pin is displaced from the first position, oil becomes enabled to pass between the advancement chamber and retardation chamber, to thereby enabling the rotation phase to be changed to the specific rotation phase by supplying oil to an appropriate one of the advancement chamber and a retardation chamber, for initiating locking.

An off-line feed rate scheduling method of a CNC machining process includes selecting a constraint variable and inputting a reference value related to the constraint variable; estimating a cutting configuration where a maximum constraint variable value (CVV) occurs through ME Z-map modeling; receiving the estimated cutting configuration and estimating a specific rotation angle (φ_s) where the maximum constraint variable value occurs through constraint variable modeling; calculating a feed rate that satisfies the reference value of the constraint variable at the estimated specific rotation angle; and applying the calculated feed rate to the NC code. Cutting force or machined surface error may be selected as a constraint variable depending on machining conditions.

In one embodiment, a first motor is used upon stopping or starting of an engine during driving of a vehicle. When a stop control or a start control of the engine is executed, a target drive force required to be generated by a second motor is calculated based on a drive force required for driving. A positive drive force required for elimination in a specific rotation direction of backlash occurring in mutual meshing sections of gears of a power distribution mechanism is added to the target drive force. Meanwhile, a braking force required of a brake in order to cancel the added positive drive force so as not to be transmitted to drive wheels is calculated. Based on the results of calculation, coordinated control is executed in which the second motor and the brake are operated in a linked manner.

A miter saw capable of displaying a specific rotation angle of a turntable and a specific tilting angle of a circular saw blade when the turntable is moved to a position within a predetermined specific rotation angle range and when the circular saw blade is moved to a position within a predetermined specific tilting angle range, respectively. Normally, a digital display displays the rotation angle at a rate of a predetermined display unit rotation angle which is an integral multiple of a predetermined unit rotation angle corresponding to a single pulse. However, if the turntable is moved to the position within the predetermined specific rotation angle range, the specific rotation angle which is not the integral multiple of the predetermined display unit rotation angle is displayed at the digital display. The same is true with respect to the tilting angle.

The invention belongs to the technical field of organic synthesis, in particular to a method for synthesizing L-menthol. The method for synthesizing L-menthol takes myrcene as an initial raw material and comprises the following steps: amination reaction: diethylamine and myrcene carry out amination reaction to obtain geranylamine; isomerization reaction: the geranylamine carries out isomerization reaction under the catalytic action of chiral catalyst to obtain intermediate enamine; hydrolysis reaction: the enamine carries out hydrolysis reaction in an acidic medium to produce intermediate D-citronellal; cyclization reaction: the D-citronellal generates L-isopulegol by lewis acid catalyst and organic solvent; and hydrogenation reaction: the L-isopulegol is hydrogenated to obtain L-menthol. The method for synthesizing L-menthol has the yield of more than 90 percent, the GC purity of higher than 99.0 percent and the specific rotation of -49 degrees to -50 degrees, the raw material myrcene has wide sources and lower cost, and the whole method has simple technology, good repeatability and high yield and is quite suitable for large-scale industrialized production.

When a rotation fluctuation amount of an engine exceeds a predetermined threshold, it is determined that there is a possibility that a misfire has occurred. Then, when a rotation fluctuation pattern of the engine coincides with a first rotation fluctuation pattern, it is determined that a misfire has occurred; whereas, when the rotation fluctuation pattern does not coincide with the first rotation fluctuation pattern, it is determined whether the rotation fluctuation pattern coincides with a specific rotation fluctuation pattern in consideration of a lock-up state of a lock-up clutch or whether an engine rotational speed is lower than a threshold. When the determination is affirmative, occurrence of a misfire is determined on the basis of whether the rotation fluctuation pattern of the engine coincides with a second misfire determination pattern that is defined to be smaller in variation of a rotation fluctuation amount than the first rotation fluctuation pattern.

While a second component is brought into contact with a first component, the first component and the second component are rotated with respect to each other around a specific rotation axis, and rotation of the first component and the second component is stopped when a moment created around the rotation axis exceeds a predetermined threshold.

The invention provides a vehicle permanent magnet synchronous motor rotary transformer zero calibration method and system. The zero calibration method comprises the following steps of controlling a permanent magnet synchronous motor to operate according to the received given current vector amplitude and the given rotating speed value; after the permanent magnet synchronous motor stably operates atthe given rotating speed value, setting the inverter in a three-phase short circuit state, and recording a first included angle and a second included angle formed by a current vector at a specific rotation speed value and a d-axis negative half axis of a preset rotor coordinate system of the permanent magnet synchronous motor in the subsequent rotation speed reduction process, then calculating the average value of the first included angle and the second included angle, and obtaining the zero offset angle of the rotary transformer. The method has the beneficial effects that the rotation speedclosed-loop measurement is realized, the influences of the friction force, the cogging torque or other non-ideal factors to the zero calibration of the rotary transformer can be eliminated or suppressed, the measurement precision is high, and the calibration can be carried out under the condition that the calibrated motor is in a vehicle-mounted state.

The invention relates to a method for preparing L-carnitine by asymmetric catalytic hydrogenation reduction. Alkyl 4-chloroacetoacetate is used as a raw material, [RuCl(cymene)(S-BINAP)]Cl[chloro[(S)-(-)-2,2'-di(diphenylphosphine)-1,1'-binaphthyl](p-cymene)ruthenium chloride(II))] is used as a catalyst, and amination and hydrolysis reaction are carried out to obtain the L-carnitine product. The amination reaction does not need any solvent or virulent cyanide. The chemical purity of the L-carnitine product is higher than 97%, and the specific rotation [alpha]20D is -29 -32. The invention has the advantages of high reaction speed, stable catalytic system, low pressure required by the reaction process, high conversion rate, no need of solvent in the amination reaction, and is convenient to operate, thereby lowering the cost, reducing the environmental pollution and being convenient for large-scale production.

The invention relates to a method for producing sulfuric acid chlorogray of styleó±, containing the following steps: under the protection of inert gas and cooled with iced water, adding aqueous solution with sodium carbonate/ potassium into organic solvent comprising chlorogray salt until the pH is higher than 9; and demixing the liquid, extracting the water layer with the same organic solvent, after combining with organic phase, drying and concentrating it to get free chlorogray alkali; then dissolving it in solvent, dropping in stoichiometric sulfate liquor, and the chlorogray formed, with the temperature controlled between minus 20 Deg.C to 5 Deg.C; then filtering the mixed solution, vacuum drying it, and then the sulfuric acid chlorogray of styleó±can be collected. The sulfuric acid chlorogray produced in such way is proved to beó±morph crystal system confirmed by X-ray diffraction, infrared spectrum and DSC spectrogram, and the fusible point is 181~186 Deg.C, and the specific rotation is 52.0í½55.0 deg. (c=1, carbinol). The method can produce sulfuric acid chlorogray of styleó±steadly.

The invention discloses a magnetic sucking climbing robot which comprises magnetic wheels, a driving vehicle body and a steering vehicle body, wherein the driving vehicle comprises a driving vehicle main body and a power driving device; two magnetic wheels are mounted on the driving vehicle main body, are driven by the power driving device and function as rear driving wheels; the steering vehiclebody comprises a steering vehicle main body and a steering device; the two magnetic wheels are mounted on the steering vehicle main body, are used for controlling steering through a steering device and are used as front steering wheels; the driving vehicle main body is connected with the steering vehicle main body through a suspension gear with a specific rotation freedom degree. As a permanent magnet is creatively combined with wheels, stable sucking of wheels is achieved, and possibility of normal operation of an image transmission component, a mechanical arm component and an ultrasonic flawdetection component behind can be created.

The control procedure of the invention sets a target rotation speed Ne* and a target torque Te* of an engine corresponding to a torque demand Td* required for driving the vehicle (steps S100 to S120). In response to an upshift request for a gear of a transmission, the control procedure sets a positive pre-upshift target rotation speed Nmtag to a target rotation speed Nm1* of a first motor (step S230). The control procedure changes the target rotation speed Ne* of the engine to a specific rotation speed corresponding to the pre-upshift target rotation speed Nmtag of the first motor (step S240) and subsequently implements an actual change of the gear in the transmission (step S310). This arrangement effectively restrains a battery from being overcharged with excess electric power.

The invention provides an encoder and a method of calculating a rotational angle position, wherein the encoder can reduce the error for the detected rotational angle position. A signal processing unit of an encoder unit is provided with a rotational angle position calculation unit (110), a calibration scale (120) and a calibration unit (130). The rotational angle position calculation unit (110) detects the rotational angle position according to a signal of a detection element; the calibration scale (120) stores the calibrating values by enabling the calibrating values to be corresponding to the divided angle positions; the calibrating values are used for offseting the error, of the rotation speed, stacked on the signal of the detection element; the divided angle positions are divided during one circle of rotation under the specific rotation speed; and according to the calibrating values stored in the calibration scale (120), the speed and the calibration value corresponding to the divided angle are calculated.

The invention relates to the fields of growth techniques for novel magneto-optic materials and optical fiber communication, in particular to a growth technique for Bi-doped rare-earth garnet film (ReBi)3Fe5O12 grown through a liquid phase epitaxial method. The method includes the following steps that (A) PbO powder with purity being above 99.99%, B2O3 powder with purity being above 99.99%, Bi2O3 powder with purity being above 99.99%, Fe2O3 powder with purity being above 99.99% and Re2O3 powder with purity being above 99.99% are uniformly mixed in a determined proportion, then put into a platinum crucible and placed in a liquid phase epitaxial furnace; (B) raw materials in the platinum crucible are heated and rotated to be fully melted, and ingredients are even. The method has the advantages that the Bi-doped magneto-optic film is grown through the liquid phase epitaxial method, the growth cycle is greatly shortened, the thickness can reach hundreds of microns, the requirement for specific rotation can be met, machining is facilitated, the size and weight of a magneto-optic device are reduced, and integration of the device is achieved.