47 results about "Ground start" patented technology

The invention relates to an automatic flameout system of an unmanned helicopter after landing, belonging to the technical field of unmanned aerial vehicles. The automatic flameout system of the unmanned helicopter after landing is characterized in that the system comprises pressing contact switches, a safety switch, an insulating strip and a weight, wherein the safety switch consists of a base and two metal reeds, the pressing contact switches are used for detecting the landing state of the unmanned helicopter and comprise a left front side pressing contact switch, a left rear side pressing contact switch, a right front side pressing contact switch and a right rear side pressing contact switch, and after the pressing contact switches are connected in series, in parallel or in series parallel, the pressing contact switches are connected with the safety switch and an engine flameout line; when the unmanned helicopter takes off, the insulating strip is drawn out by the weight from the safety switch, the safety switch is turned on, the pressing contact switches are turned off and the system is started; and when the unmanned helicopter is landed, the pressing contact switches are pressed and are turned on, and an engine is flamed out immediately because the entire flameout line is short-circuited to the ground. The automatic flameout system of the unmanned helicopter after landing simultaneously considers the engine ground startup, the air flight and the landing of the unmanned helicopter and can simply and reliably realize the automatic flameout of the unmanned helicopter after landing.

A hybrid surge protector for a network interface device (NID) is disclosed. The hybrid surge protector includes a fail-safe spring connected to the ground electrode of a three-electrode gas tube. Tabs on the fail-safe spring are held away from the gas-tube end electrodes by a fusible element. The hybrid surge protector also includes metal-oxide varistor elements (“MOVs”) in contact with the gas-tube end electrodes and with the ground electrode via an MOV spring. This arrangement provides for two initial paths to ground-one path from the gas-tube end electrodes to the ground electrode through the gas tube, and another from the gas-tube end electrodes to the ground electrode through the MOVs and the MOV spring. The dominant path to ground starts as the MOV ground path but switches to the gas-tube path as the gas tube becomes activated. Another path to ground via the fail-safe spring is also available should the gas tube overheat. A surge protection module that includes the hybrid surge protector is also disclosed.

Stair elements installed on sloped ground starting bottom up and using a riser reversibly secured with a clamping mechanism. Each riser is attached to a corresponding tread at the time of installation. The manner of fixing the riser to the tread permits the relationship between the two to be adjusted for angle and position.

Dampers for bearing assemblies of gas turbine engines are provided. For example, a damper comprises a damper housing, a lubricant passage defined in the damper housing, and a valve positioned within the lubricant passage. The lubricant passage includes an inlet and an outlet. In one embodiment, the valve is configured to restrict a flow of lubricant from the inlet into the damper when a reference temperature is below a threshold temperature. In another embodiment, the valve is configured to increase leakage of a lubricant through the outlet when a reference temperature is below a threshold temperature. In other embodiments, the valve is passively actuated and is configured to move within the lubricant passage to control a flow of lubricant from the inlet to the outlet based on a reference temperature.

The invention relates to a method for troubleshooting a turbofan engine ground test start-up fault. The method firstly performs troubleshooting for the settings of the turbofan engine console panel switch for different fault conditions during the turbofan engine ground test start-up, and then performs troubleshooting for the turbofan engine. Troubleshooting of the starter equipped with the engine, troubleshooting of the fuse in the contactor box of the turbofan engine and the power supply circuit of the starter equipped with the turbofan engine Troubleshooting of the turbofan engine fuel surge valve and related circuits, and finally, troubleshooting of the peripheral circuit of the turbofan engine starter box until the turbofan engine ground test starts normally, and the turbofan engine ground test startup troubleshooting is realized. The method of the invention eliminates the startup fault of the turbofan engine ground test in a short time, saving time and cost of troubleshooting.

The invention discloses a method and device for controlling flat ground starting of a vehicle and the vehicle. The method includes the steps that accelerator pedal signals, brake pedal signals, the current engine rotating speed and hill signals of the vehicle are obtained; the target axle speed of a clutch is determined according to the accelerator pedal signals, the brake pedal signals, the current engine rotating speed and the hill signals, and the current axle speed of the clutch is further obtained; a target axle speed processing mode of the vehicle is determined according to the current axle speed of the clutch and the target axle speed of the clutch, and the target engine rotating speed corresponding to the target axle speed processing mode of the vehicle is obtained; and the increment of torque transmission of the clutch is worked out according to the current axle speed of the clutch, the target axle speed of the clutch, the accelerator pedal signals, the current engine rotating speed and the target engine rotating speed, and the clutch engaging position is determined according to the increment of torque transmission of the clutch. By means of the method, starting smoothness is improved, starting impact is reduced, abrasion to the clutch is lowered, and therefore user experience is improved.

The invention discloses a data wireless replacement method based on a train operation monitoring and recording device, which reduces manual participation in LKJ data replacement, improves data replacement efficiency, reduces work intensity, and prevents wrong replacement, missed replacement, and early replacement. The technical solution is as follows: the on-board data file is transmitted to the cache of the on-board data replacement module through the wireless network; the on-board data replacement module simultaneously sends the ready status to the ground system and the on-board display to request online update of the on-board data; manually starts on the on-board display The online update process or the ground change control personnel use the ground to start the online update; the wireless communication module obtains the identification number of the vehicle-mounted host plug-in configured on the ground, and automatically compares it with the number of the vehicle-mounted host plug-in. Only when the comparison is consistent can the process continue Online update process until the update is complete.