Abstract: A method and an apparatus are disclosed for controlling bandwidth of multiple Set Top Boxes of a single user in an IPTV system. The method includes saving content bandwidth of every media content by the EPG of the IPTV system; when receiving a start-up and log-in request or a request for switching programs of the present Set Top Box operating currently in multiple Set Top Boxes sharing an identical user bandwidth transmitted by the EPG, a Management Platform of the IPTV system sending the remaining user bandwidth corresponding to the present Set Top Box to the EPG; the EPG comparing the remaining user bandwidth with content bandwidth of every media content saved by itself, and generating a program list of media contents whose content bandwidths are less than or equal to the remaining user bandwidth for the present Set Top Box to select and use.

Abstract: A four-wheel drive electric vehicle is provided. The vehicle comprises a chassis and a power system. The power system comprises batteries, an electric motor, a DC-DC converter and an electric motor controller which are electrically connected, and the chassis comprises a frame, a transmission/transfer case, a drive shaft, a front axle assembly as well as a rear axle assembly. The transmission/transfer case, the front axle assembly and the rear axle assembly are mounted on the frame. The transmission/transfer case is connected with the rear axle assembly directly and with the front axle assembly via the drive shaft. Under the control of the electric motor controller, the electric motor is driven to rotate by the batteries, whereby a power is transferred from the motor to the transmission/transfer case, and a part of the power is transferred to the rear axle assembly with the other part transferred to the front axle assembly via the drive shaft.