44results about How to "Improve starting characteristics" patented technology

A motor driving circuit drives a motor on receipt of an error signal having a digital value corresponding to a deviation between a current rotation speed of the motor, which is the subject to be driven, and its target value. A digital filter eliminates a high-frequency component of the error signal. A driving unit controls an electric current flowing through the motor in accordance with the digital value of the error signal from which the high-frequency component is eliminated by the digital filter. An upper-limit value setting unit sets an upper limit value to the digital value of the error signal input to the digital filter. The upper-limit value setting unit is configured to be capable of changing the upper limit value in accordance with a setting signal from the outside.

An engine decompression system that can secure a projecting height of a decompression cam from a base face of a valve operating cam to be relatively large in an engine starting rotational region, and maintain a state in which the projection height is decreased in a complete combustion rotational region of the engine. The decompression system includes a decompression cam shaft provided on a valve operating cam shaft or a rotating member integrally coupled thereto, the decompression cam shaft being capable of rotating between an operating position in which a decompression cam projects above a base face of a valve operating cam to slightly open engine valves during a compression stroke and a release position in which the decompression cam is withdrawn to allow the engine valves to close. A centrifugal mechanism connected to the decompression cam shaft maintains the decompression cam shaft at an operating position in a starting rotational region, and rotates the decompression cam shaft to the release position in a normal running region. The centrifugal mechanism is arranged so that, in a complete combustion rotational region between the starting rotational region and the normal running region, the decompression cam shaft is maintained at a middle position at which the projection height of the decompression cam is less than the projection height at the operating position.

The present invention relates to a heavy duty double-shaft scrap steel shredder, which comprises a frame, a box, a material inlet hopper, a left hydraulic motor, a right hydraulic motor, a left speed reducer, a right speed reducer, a left connection flange, a right connection flange, a front cutter roller, a rear cutter roller, left bearing pedestals for arranging the front cutting roller and the right cutting roller, and right bearing pedestals for arranging the front cutting roller and the right cutting roller, wherein the box is arranged on the frame, the top portion of the box is provided with an opening, the material inlet hopper is arranged on the box opening on the top portion, the left side and the right side of the box are respectively provided with the front cutting roller left bearing pedestal, the front cutting roller right bearing pedestal, the rear cutting roller left bearing pedestal and the rear cutting roller right bearing pedestal, the front cutting roller right bearing pedestal is connected with the right flange, the rear cutting roller left bearing pedestal is connected with the left flange, the left speed reducer and the right speed reducer are respectively connected with the left hydraulic motor and the right hydraulic motor, the front cutter roller is arranged on the front cutting roller left bearing pedestal and the front cutting roller right bearing pedestal, the front cutter roller and the rear cutter roller are connected on the left speed reducer and the right speed reducer, and the front cutter roller and the rear cutter roller are provided with a front shaft cutter for shredding the material and a rear shaft cutter for shredding the material. The heavy duty double-shaft scrap steel shredder has advantages of low rotation speed, low noise, high torque, strong medium-thick steel plate shredding ability, low energy consumption, safety, reliability and the like, and can used for batch and mechanized scrap steel material treatment.

The invention belongs to the technical field of power transmission, in particular to a stepless transmission device. According to the technical scheme, a four-segment hydraulic mechanical composite transmission device comprises an input shaft, an output shaft, a planetary transmission component, a fixed shaft gear transmission component, a hydraulic speed regulating component, a segment-change operating component and an idler. One Lavina planetary mechanism is adopted as foundation, a multi-shaft fixed shaft gear and a synchronizer are utilized completely, three shunt modes of different-speed integrated torque, different-speed integrated speed and different-torque integrated speed are engaged reasonably, a four-segment continuous stepless speed change transmission structure, and the four-segment hydraulic mechanical composite transmission device has the advantages of simple structure, small size and the like; furthermore, by the aid of the four-segment hydraulic mechanical composite transmission device, purely mechanical transmission conditions of reverse gear and six fixed gears can be realized.

The invention relates to a closed type return flow channel flow field control method. The closed type return flow channel flow field control method is characterized by comprising the following steps that a, according to design parameter requirements, a hypersonic air inlet duct geometric profile is designed, and the air inlet duct self-starting characteristics are simulated and analyzed; b, basedon different static pressure distribution laws in a compression surface before an inlet of a hypersonic air inlet duct during start/non-start, the pressure difference distribution before and after a shock wave is adopted, and a return flow cavity is formed in the air inlet duct to control a flow field of the air inlet duct; c, the inlet and outlet positions of a return flow channel and cross-sectional parameters of the return flow cavity are subjected to simulated analysis, and the geometric profile parameters of the return flow channel are optimized; and d, the geometric profile parameters ofthe return flow channel are adjusted to determine a final air inlet duct structure. The closed type return flow channel flow field control method can improve the starting ability of the hypersonic air inlet duct at a low Mach number and broadens the range of the working Mach number of the air inlet duct.

The invention discloses a flow control method capable of improving starting performance of an inlet by use of a flexible wall surface and relates to a ramjet engine inlet. Type selection of a flexiblematerial is determined according to fluidity pressure oscillation frequency and amplitude when the inlet is not started; the size of the flexible wall surface is determined according to the size of an air flow separation area at the compression section inlet when the inlet is not started; the initial mounting position of the flexible wall surface is determined according to the initial position ofthe air flow separation area. When the inlet is not started, fluidity pressure is periodically oscillated, the flexible wall surface is driven to produce tiny oscillation, so that the oscillation flow field energy is transferred and dissipated toward the flexible wall surface, flow field oscillation is inhibited, and the purpose of improving the starting characteristic of the supersonic speed inlet is achieved. The flow field oscillation is inhibited through oscillation of the flexible wall surface with the flow field, and the starting characteristic of the supersonic speed inlet can be improved; the structure is simple, the control effect is remarkable, and the engineering application potential is high.

A start control device of an internal combustion engine, the start control device includes: a starting unit, which cranks the internal combustion engine to start the internal combustion engine while opening and closing an intake valve; a variable valve mechanism, which can change a closing timing of the intake valve; and a control unit, which controls the variable valve mechanism so as to advancethe closing timing of the intake valve while the starting unit cranks.

This invention discloses a rotor of a synchronous reluctance machine including a core, several conducting rods inserted into the outer cycle of the core in uniform space and several blocking plates plugging into the core divided into two symmetrical groups around the shaft-center. The said conducting rods includes: the conducting rods inserting into the outer cycle of the core and connecting with the ends of the blocking plates and deep-inserting rods inserting but not connecting with their ends, the outer surfaces of the rods are just aligned with the peripheral face of the core and the deep-inserting rods deep in the peripheral face of the core forming a certain distance between the two outer surfaces.

A motorcycle includes a CPU (Central Processing Unit) of an ECU (Electronic Control Unit) that drives a fuel heating device when a fuel heating condition is satisfied and the result of a fuel heating prohibition determination process indicates that heating is permitted. On the other hand, the CPU does not drive the fuel heating device when the fuel heating condition is not satisfied or when the result of the fuel heating prohibition determination process indicates that heating is prohibited. In the fuel heating prohibition determination process, the CPU determines a tilted state of the motorcycle, and prohibits or permits heating of fuel in a fuel pipe by the fuel heating device based on a detection result of the tilted state.

The invention relates to a high efficiency bistable electromagnetic clutch, and relates to the technical field of driving. The high efficiency bistable electromagnetic clutch solves the problem of the existing clutch in the structure and in the energization manner that enough starting force can be generated by applying larger electric current and the acting force generated in the process is too large after starting and is several dozens of times of starting force. A chamfer angle is formed between the right end surface of an upper magnetic conducting column of a first stator and the upper end surface of the upper magnetic conducting column of the first stator, and a chamber angle is formed between the right end surface of a lower magnetic conducting column of the first stator and the lower end surface of the lower magnetic conducting column of the fist stator; a chamber angle is formed between the left end surface of an upper magnetic conducting column of a second stator and the upper end surface of the upper magnetic conducting column of the second stator, and a chamber angle is formed between the left end surface of a lower magnetic conducting column of a second stator and the lower end surface of the lower magnetic conducting column of the second stator. The clutch is suitable for bistable electromagnetic clutch systems with general precision requirements, and is used for direct driving control of brushless direct current motors and bistable electromagnetic clutches.

The invention discloses a power box for electric wheel type engineering machinery. The power box comprises a gearbox, a transfer case and a power output box. The transfer case is located on the upper portion of the gearbox. The power output box is located on the lower portion of the gearbox. The gearbox and the transfer case are provided with case covers. Hydraulic pump PTO interfaces and a variable speed pump PTO interface are arranged on the transfer case. A front axle driving interface is formed in one side of the power output box, and a rear axle driving interface is formed in the other side of the power output box. According to the power box, a working device hydraulic pump motor, a running driving motor, the hydraulic pump PTO transfer case, the gearbox, a front output device, a rear output device and the like can be integrated into an integrated power assembly, and a traditional engine, a torque converter and a hydraulic transmission gearbox are directly replaced under the condition that the structure and an oil way of a traditional engineering vehicle are not changed. The power assembly can meet the requirement for independent driving of running of the working device hydraulic pump, a steering pump and the engineering machinery, the motor is adopted for driving, advancing and retreating can be achieved through reverse rotation of the motor, and a reversing mechanism with complex transmission is replaced.

Disclosed is a hot cathode discharge lamp (20) comprising a glass bulb (22) whose cross section perpendicular to the tube axis has a flattened shape, and electrode coils (31a, 31b) arranged within the glass bulb (22) so that the axes thereof are aligned along the major diameter of the flattened shape. The length L of the electrode coils (31a, 31b) in the axis direction satisfies the following relation: L2 < L < L1, with L1 being the major inner diameter of the flattened shape of the glass bulb (22)and L2 being the minor inner diameter thereof. Also disclosed is a backlight unit (5) comprising the hot cathode discharge lamp (20) as a light source.