Power saving system for underwater vehicles

Abstract

A power saving system for underwater vehicles includes a control system, a power unit and a battery. The control system controls the power unit to drive the underwater vehicle, and generates an output driving value. The control system includes a calculation unit, a three-axis accelerometer and gyro and an underwater vehicle weight value. The calculation unit creates a correspondent acceleration value by the output driving value and the underwater vehicle weight value. The three-axis accelerometer and gyro detects the acceleration of the underwater vehicle by every less than 0.5 second interval, and generates an acceleration value. The control system compares the correspondent acceleration value and the acceleration value to control the output driving value so as to save battery power and elongate the range of travelling of the underwater vehicles.

What is claimed is: 
     
         1 . A power saving system for underwater vehicles, comprising:
 an underwater vehicle having a control system, a power unit and a battery, the battery providing electric power to the power unit, the control system controlling the power unit to drive the underwater vehicle, and generating an output driving value, and   the control system including a calculation unit, a three-axis accelerometer and gyro and an underwater vehicle weight value which is built in the control system, the calculation unit creating a correspondent acceleration value by the output driving value and the underwater vehicle weight value, the three-axis accelerometer and gyro detecting an acceleration of the underwater vehicle at interval of less than 0.5 second, and generating an acceleration value, the control system comparing the correspondent acceleration value and the acceleration value, when the correspondent acceleration value is larger than the acceleration value, the control system judges that an resistance applied to the underwater vehicle increases, and the output driving value is increased, when the correspondent acceleration value is smaller than the acceleration value, the control system judges that an resistance applied to the underwater vehicle reduces, and the output driving value is reduced.   
     
     
         2 . The power saving system for underwater vehicles as claimed in  claim 1 , wherein the power unit includes a propeller and a variable frequency motor which drives the propeller. 
     
     
         3 . The power saving system for underwater vehicles as claimed in  claim 2 , wherein the output driving value is an output force generated from the propeller to drive the underwater vehicle by the variable frequency motor. 
     
     
         4 . The power saving system for underwater vehicles as claimed in  claim 1 , wherein the control system includes a timer which is used to set the intervals and to calculate the intervals. 
     
     
         5 . The power saving system for underwater vehicles as claimed in  claim 1 , wherein the battery is a rechargeable battery.