151results about How to "Shorter arrival time" patented technology

A vehicle surroundings monitoring apparatus which determines whether there is a possibility of contact between a vehicle and a monitored object around the vehicle with a single camera mounted thereon. It includes a monitored object extraction process unit (20) which extracts an image portion of the monitored object from an image taken by a single infrared camera (2), a rate-of-change calculation process unit (21) which calculates a rate of change in size of the image portion of an identical monitored object extracted by the monitored object extraction process unit (20) from a plurality of images taken by the infrared camera (2) at predetermined time intervals, an arrival time estimation process unit (22) which estimates the time to arrival of the monitored object at the vehicle based on the rate of change, a real space position calculation process unit (23) which calculates a position of the monitored object in the real space based on the rate of change, a movement vector calculation process unit (24) which calculates a movement vector from a displacement of the position of the monitored object in the real space, and a contact determination process unit (25) which determines whether there is a possibility of contact between the monitored object and the vehicle.

An air conditioner for a vehicle includes a refrigerant cycle having an evaporator which is disposed in a blowing duct and cools air by refrigerant evaporation in the blowing duct; a compressor setting the evaporated refrigerant at a high temperature and high pressure; a refrigerant-to-water heat exchanger heating cooling water by heat transfer from the refrigerant discharged from the compressor; and an expansion device decompressing the refrigerant discharged from the refrigerant-to-water heat exchanger. The air conditioner also includes a cooling water cycle having a heater core which is disposed on the downstream side of the evaporator; a radiator cooling the cooling water; a pump circulating the cooling water cooled by the radiator; a power engine cooled by the cooling water fed by the pump; and the refrigerant-to-water heat exchanger. The refrigerant cycle performs cooling for dehumidification by performing the operation of heating.

The invention provides a symmetrical time-varying output-constrained aircraft attitude control method. In view of a dynamic system of a four-rotor aircraft, a symmetrical time-varying logarithmic tangent composite constraint Lyapunov function is selected, and a four-rotor aircraft output constraint control method based on the symmetrical time-varying logarithmic tangent composite constraint Lyapunov function is designed. The design of the symmetrical time-varying logarithmic tangent composite constraint Lyapunov function is to ensure the output of the system to be constrained in a certain range, too large overshooting is avoided, and the arrival time can also be reduced. The dynamic response performance of the four-rotor aircraft system is further improved. According to the symmetrical time-varying output-constrained aircraft attitude control method provided in the invention, the system thus has a good dynamic response process.

The invention provides an asymmetrical time-varying constrained aircraft attitude control method. In view of a dynamic system of a four-rotor aircraft, an asymmetrical time-varying arctangent constraint Lyapunov function is selected, and a four-rotor aircraft output constraint control method based on the asymmetrical time-varying tangent cosine composite constraint Lyapunov function is designed. The design of the asymmetrical time-varying arctangent constraint Lyapunov function is to ensure the output of the system to be constrained in a certain range, too large overshooting is avoided, and the arrival time can also be reduced. The dynamic response performance of the four-rotor aircraft system is further improved. According to the asymmetrical time-varying constrained aircraft attitude control method provided in the invention, the system thus has a good dynamic response process.