440results about How to "Improve starting performance" patented technology

The invention discloses a quasi-close loop starting method of a brushless direct current motor free of a position sensor, namely a quasi-close loop three-stage starting method with rotor initial position accurate pre-positioning and optimization positioning in the acceleration process combined. Short-time pulse voltage vectors are exerted in a motor winding, the rotor position can be locked in a range within 60-degree electrical angles by detecting direct-current bus current, and rotor accurate pre-positioning is completed by electrifying a designated winding, detecting current and comparing the current on the basis of rotor position locking. After rotor position pre-positioning, rotors enter the optimization positioning and acceleration stage, current differentials serve as the phase change conditions in the threshold range so that the rotors are ensured to change phase accurately in the acceleration process, and a system is switched into a counter electromotive force operation state. Experimental results show that the quasi-close loop three-stage starting method is low in cost and high in reliability, and can ensure that the system is in the quasi-close loop working state in the whole starting process and cannot have step-out and starting failure.

The invention provides a power system of a compound energy electro-vehicle, comprising a compound power supply controlling machine box, a main power supply connected with the power supply controlling machine box, a solar energy photovoltaic cell and a super capacitor module set, wherein, the output end of the compound power supply controlling machine box is connected with a motor driving controlling module and an assistant device, and the other end of the motor driving controlling module is connected with a motor; a hardware main circuit and a control circuit which are mutually connected are arranged in the compound power supply controlling machine box; the hardware main circuit is connected with the solar energy photovoltaic cell via an unidirectional DC/DC converter and is connected with the super capacitor module set via a bidirectional DC/DC converter; the input end of a microprocessor in the control circuit is connected with a temperature detecting module, a current detecting module and a pressure detecting module via a signal conditioning circuit, and the output end is connected with the motor driving circuit and an assistant device potentiometer via an optocoupler isolation circuit. The invention can better improve the acceleration performance and climbing performance of a vehicle, reduce heavy current discharging time of the main power supply and avoid the main power supply from damage and reduction of volume.

A pneumatic tire includes, on a tread 10, a plurality of block rows 11 and 12 defined by circumferential main grooves 14 extended in a tire circumferential direction and by lateral grooves 16 intersecting the circumferential main grooves. Each tread-end-region block 11 has two zigzag sipes 11a, and each tread-center-region block 12 has one zigzag sipe 12a. Here, a total length of each sipe owned by one block on a tread surface, the number of sipes, and a sipe rigidity index (F) are larger in the tread-end-region block 11 than in the tread-center-region block 12.

The invention discloses a high-performance rectangular double-channel outer parallel TBCC inlet. In terms of design, on the basis of the traditional two-stage external compression hypersonic inlet, the present invention designs the two-stage compression surface as a rotating lip cover, and adds a low-speed channel on this basis to realize the external parallel structure, and the low-speed The lower wall of the channel is designed as a variable structure, so that the shrinkage ratio in the low-speed channel can be adjusted, thereby improving the problem of poor starting performance in the low-speed channel. The two-stage compression surface of the high-speed channel and the lip cover of the low-speed channel are combined into one, and act as a mode conversion valve, which simplifies the structure of the intake port and enhances reliability. At the same time, the present invention also provides a specific embodiment of the rotating lip cover. The rotating lip cover is controlled by a servo motor in the form of a sliding thin plate introduced into the side wall of the passage, so that the movement of the rotating lip cover can be controlled. While satisfying the mode conversion, The flow control of the low-speed channel can also be realized by cooperating with the variable throat.

The invention relates to a logic control method for improving the starting performance of a vehicle, which comprises the following steps of: judging whether the vehicle is in a starting process at present or not by a starting-assisting function module according to a vehicle-speed signal, an engine rotating-speed signal, a speed-changer gear signal, an electronic accelerator-pedal opening signal and a braking signal; if so, calculating and outputting a starting-target idling-speed increment to an idle-speed control function module according to a current engine water-temperature signal, and controlling an engine by the idle-speed control function module to increase the starting-target idling-speed increment part to be used as a target idle speed in the starting process by the engine on the basis of an original target idle speed; and after the starting process of the vehicle is judged to be finished by the starting-assisting function module according to the vehicle-speed signal, the speed-changer gear signal, the electronic accelerator-pedal opening signal or the braking signal, quitting a starting-assisting function to enable the engine to be restored at the original target idle speed to normally operate. Through the control method, the engine can have a lower idling speed in an idle-speed state, and the vehicle has a higher idling speed in the starting process.

The present invention belongs to the technique field of wind power generation, and relates to a yawing device of an aerogenerator, which consists of a controller, a yawing arrester, a yawing pilot relay, a yawing contactor, a yawing electric motor, a yawing retarder, a yawing outer rotor, a yawing counter, a cable sensor, a dogvane, and an anemoscope. The electric motor is connected with the yawing retarder which is joggled with a big yawing rotor. The controller controls the yawing arrester according to the input signal of the dogvane or the anemoscope, and the operation of the yawing electric motor by the yawing pilot relay and the yawing contactor. The yawing electric motor drives the big yawing rotor by the yawing retarder. The electric motor is a magnetoelectric machine with the structure of Halbach magnet. The present invention can improve the starting performance of the yawing device and cause the yawing device to drive the main flight crew compartment to rotate easier under the work situation of frequent starts and stops; at the same time, the over loading capability of the yawing electric motor is improved and the malfunction rate of the yawing device is decreased to maintain the workload, and the operation life of the yawing electric motor is prolonged.

Pressure detection means detects the pressure of an evaporation purge system that includes a fuel tank and a communicating tube, which connects a canister for adsorbing and retaining fuel vapor to an intake pipe. Shutout means shuts out the evaporation purge system from atmospheric air. A pump is driven for pressurization or depressurization purposes while the shutout means shuts out the evaporation purge system from atmospheric air. The pump is stopped when the pressure detected by the pressure detection means reaches a predetermined level. A leak judgment is formulated in accordance with pump drive time and a pressure change after pump stoppage.

The invention discloses a wheel tooth type crusher which comprises a base, an casing, a main unit, two sets of drive mechanisms and a hydraulic adjustment safety system; wherein the casing is arranged on the upper side of the base; the main unit which comprises a rotor part is arranged in the casing; the two sets of drive mechanisms are arranged by both sides of the main unit; the rotor part consists of a fixed roll shaft, a movable roll shaft, fixed bearings and movable bearings; the fixed roll shaft and the movable roll shaft are arranged in parallel; the fixed bearings and the movable bearings respectively bear the fixed roll shaft and the movable roll shaft; the outer surfaces of the two roll shafts are respectively provided with a cluster of breaking teeth axially spaced from one another; the breaking teeth on the two roller shafts are axially arranged in a staggered way; the drive mechanisms respectively drive the two roll shafts to rotate in opposite directions; and the main unit also comprises a pair of cleaners and an adjustor for adjusting the gap between the two roll shafts. The wheel tooth type crusher can eliminate overload impact and vibration caused by non-breaking materials; after the breaking teeth on the two roll shafts are worn down, the relative gap and positions between the two roll shafts can be easily adjusted, thereby increasing the working efficiency of the breaking.

The invention allows an accurate positioning to obtain a large inertia torque at starting. Especially, it prevents retrogradation that may occur when rotating an engine in the reverse direction by a motor and shutting down for positioning. At starting, the motor is energized by a first reverse rotation unit 111 to rotate the engine in the reverse direction to the position in the vicinity of the top dead center. After reverse rotation by the first reverse rotation unit 111, a second reverse rotation unit 113 energizes the engine further in the direction of reverse rotation with a small torque while reducing an exciting current to the motor. The exciting current is set to a degree that can obtain a braking effect for reducing retrogradation that may occur when the engine is stopped at a predetermined position within a high-load region after being rotated in the reverse direction. A stop position is set in advance between the top dead center on the compression stroke immediately before and the range of opening and closing operation of an exhaust valve, and whether or not the engine has reached the stop position may be recognized by a crank angle.

The invention discloses a double-layer fried bread stick machine. The method comprises a rack and a conveyor belt mounted on the rack, a front dough feeding mechanism located in a material feeding end of the conveyor belt, and a first dough pressing mechanism, an oil brushing mechanism, a water brushing mechanism, a second dough pressing mechanism, a round cutter mechanism, a medium press roller mechanism, a cutting table mechanism which are arranged from the material feeding end to a material discharging end; a rear dough feeding mechanism is located on the conveyor belt, and the output end of the rear dough feeding mechanism is located at an input end of the second dough pressing mechanism; a dough rolling mechanism and a three circular cutter mechanism are at least arranged on the front dough feeding mechanism. According to the double-layer fried bread stick machine, imitating manual rolling of the fried bread stick dough can be achieved; through brushing oil and water alternately, the edges of the fried bread sticks can rise easily when fried, the middle connections are good and do not explode, so that two layers of fried bread sticks stick well together, and it is not possible to cause dough stickiness for the fried bread sticks; the rising effect is good, it is ensured that the yield of finished products is 100%, the appearance is beautiful, the prepared double layer fried bread sticks are fed into a frying pan mechanism automatically, and the degree of automation is higher.

The invention discloses a pneumatic type/mechanical type combined adjustment mach number 0-7 stage combined engine air inlet. The pneumatic type/mechanical type combined adjustment mach number 0-7 stage combined engine air inlet is mainly composed of a high-speed channel, a low-speed channel, a mechanical type variable geometry assembly and a pneumatic type shock wave adjusting assembly. Under the low-speed mode, the mechanical type variable geometry assembly is adopted for adjusting the throat area and the internal shrinkage ratio of the air inlet, and the low mach number starting performance and the high mach number compression performance of the air inlet are guaranteed; and under the high-speed mode, the pneumatic type shock wave adjusting assembly is used for adjusting the precursor shock wave position, the precursor shock wave sealing state is kept, and the discharge coefficient and the working performance of the air inlet are obviously improved within the wide mach number scope. According to the pneumatic type/mechanical type combined adjustment scheme, the compression amount and the precursor shock wave position of the air inlet can be continuously adjusted, it is guaranteed that the combined engine air inlet can effectively work within the wide mach number scope, and the good pneumatic performance is obtained.

The invention relates to a rotor position detecting device of a permanent magnet type synchronous motor, which comprises a sensing assembly, a detecting circuit and a sensing circuit. The detecting device is characterized in that the sensing assembly is used for sensing the current of the permanent magnet type synchronous motor and generates a sensing signal; the detecting circuit is used for enabling a plurality of voltage vectors to act on the permanent magnet type synchronous motor in sequence; the sensing circuit is connected with the sensing assembly and generates an overcurrent signal and a zero-current signal to the detecting circuit according to the sensing signal, wherein the detecting circuit counts the total conducting time of the current flowing through the motor under each voltage vector according to the overcurrent voltage and the zero-current signal, and the rotor position of the permanent magnet type synchronous motor is judged according to the total conducting time.

The invention provides an internal combustion engine with fuels being mixed and ignited on the spot and a control method thereof, in particular preparation, feeding and combustion control of fuels ofa combustion engine. A set of high-cetane and high-octane fuel feed and control system is additionally arranged in the internal combustion engine, and the system comprises a mixed fuel electronic control unit (8), a high-octane fuel box (9), a high-octane fuel pressure regulator (10), a high-octane fuel nozzle (13), a high-cetane fuel nozzle (14), a high-cetane fuel pressure regulator (17) and a high-cetane fuel box (18); and by controlling the high-octane flue nozzle, the high-cetane fuel nozzle and an ignition module, the spot mixing, the mixing ratio control, the excess air coefficient control and the ignition control of high-octane fuel and high-cetane fuel are achieved. The invention avoids accidental fire of the traditional single-fuel spark-ignition internal combustion engine in a cold starting process, improves the idling performance and the intermediate-speed and high-speed performance of the internal combustion engine effectively, and achieves the aims of energy saving and emission reduction of all working conditions of the internal combustion engine.

The invention relates to a novel vehicle weak-medium degree hybrid power synthetic system, which is adopts a motor, a planetary gear set and a high-speed flywheel assembled together, is suitable to be used as starting acceleration assistance and recover braking energy for various automobiles, tractors, hybrid power vehicles, all terrain vehicles and electric vehicles, and is particularly suitable to be used by city buses. The novel vehicle weak-medium degree hybrid power synthetic system is characterized in that: a planet carrier (1) of the planetary gear set and a wheel are connected or in parallel connection with a vehicle drive system; a sun wheel (2) is coaxially connected with a driving part of a clutch (8); a driven part of the clutch (8) is connected with the flywheel (6) which is connected with the motor (9); a planet wheel (3) is arranged on the planet carrier (1) and is meshed with an inner gear ring (4) of the sun wheel (8); the periphery of the inner gear ring (4) is provided with a brake strap (5); the planet carrier (1) can be connected with a gear (7); and the gear (7) can be connected with a wheel or the drive system.

The present invention provides a fuel cell unit having a structure in which vapor is efficiently diffused in a fuel diffusion layer through a region having a reduced diffusion resistance, so that vapor is spread to every corner in a direction along an opening, thereby reducing variation in wetness of a polymer electrolyte membrane. As a result, as compared with a case where there is no region having a reduced diffusion resistance, a proper moistened state is maintained over a wider range of the polymer electrolyte membrane, thereby making it possible to enhance hydrogen ion transfer ability of the polymer electrolyte membrane as a whole.

The invention relates to a device and method for controlling start of a compression self-ignition engine. According to the device and method for controlling start of a compression self-ignition engine, a restart controller (52) of an electronic control unit (50) determines whether the restart condition of the engine is satisfied based on the various sensor values (Step S21), the piston stop position of the compression-stroke-in-stop cylinder is confirmed to be within the reference stop position range R (Step S22: YES), the fuel is injected in the compression-stroke-in-stop cylinder, the controller controls the fuel injector to perform a pre-injection before a main injection and increase a total injection amount of the fuel for the pre-injection as the stop position of the compression-stroke-in-stop cylinder piston is further on a top dead center side (Step S23)

The invention relates to a transmission, in particular to a planetary automatic transmission. The planetary automatic transmission comprises the input end, a torque converter, a lockup clutch, a hydraulic retarder, four planetary rows, two clutches, four brakes and the output end, wherein the input end is connected with a torque converter pump impeller, a torque converter worm wheel and a rotor of the hydraulic retarder are connected with a first planetary frame, a first gear ring and a second solar gear are connected with a third solar gear, a second planetary frame and a third gear ring are connected with a fourth solar gear, a third planetary frame and a fourth planetary frame are connected with the output end, the two ends of the lockup clutch are connected with the torque converter worm wheel and the torque converter pump impeller respectively, the two ends of the first clutch are connected with the first planetary frame and a first solar gear respectively, the two ends of the second clutch are connected with the first gear ring and the second solar gear respectively, one ends of the brakes are fixed, and the other ends of the brakes are respectively connected with the first solar gear, the second gear ring, the third gear ring and the fourth gear ring. According to the planetary automatic transmission, six forward gears and two backward gears can be achieved, the structure is simple, and machining is conveniently carried out.

The invention discloses an electric automobile transmission and a speed change method of the electric automobile transmission. The electric automobile transmission comprises a hydraulic torque converter with the locking function, a planet gear mechanism, an oil pump, an oil pump motor, a controller, a speed reducing mechanism and a differential mechanism. The hydraulic torque converter with the locking function comprises a pump impeller, a turbine, an input shaft, an output shaft and other components. A driving motor is connected with the pump impeller through the input shaft, and the turbine is connected with the output shaft. The torque of the output shaft is transmitted to the planet gear mechanism. The planet gear mechanism comprises a sun gear, a planet carrier, a big gear ring, a clutch, a brake and other components. Torque is output from the planet carrier through the planet gear mechanism and drives an automobile to run after passing through the speed reducing mechanism and the differential mechanism. The transmission can have two mechanical transmission gears and one hydraulic torque conversion gear. The oil pump is used for providing pressure for a hydraulic system of the transmission. Due to the electric automobile transmission, the climbing performance and the acceleration performance of the electric automobile can be improved, and the reliability of the automobile can be enhanced.