| 摘要 |
In one aspect, a vehicle tracking device is adapted to be mounted on a vehicle, comprising: an information collector configured to collect position information, the position information indicating the position of the device within a first area; a transmitter configured to transmit the position information to a remote apparatus using a communication network, wherein the apparatus is configured to transmit the position information to a user terminal; and a beacon configured to send radio frequency signals to the user terminal (40) within a range covering at least the first area, in order to enable the terminal to locate the device within a second area, wherein the second area is smaller than the first area.In another aspect, a vehicle tracking device (2) is configured to be mounted on a vehicle (20), wherein the device is configured to have a normal operating mode and an energy saving operating mode, wherein the device further comprises a detection module (28) for detecting, in the energy saving mode of the device, at least one of a linear acceleration and an angular acceleration corresponding to a physical displacement of the device (2), and wherein the detection module (28) is configured to provide an operating mode instruction to the device, responsive to the detecting, wherein the instruction is adapted to trigger the device to operate in the normal mode if the detected linear acceleration or the angular acceleration of the device is greater than a threshold of at least one of 0.3m.s-2 and 0.3°.s-2.In another aspect, a vehicle tracking device (2) is configured to be mounted on a vehicle (20), wherein the device is configured to have a normal operating mode and an energy saving operating mode, wherein the device further comprises a heading measurement module (29) for detecting, in the energy saving mode of the device, a variation of a heading of the vehicle in a predetermined period of time, and wherein the heading measurement module (29) is configured to provide an operating mode instruction to the device, responsive to the detecting, wherein the instruction is adapted to trigger the device to operate in the normal mode if the variation of a heading of the vehicle is greater than a threshold corresponding to 30° per minute. In another aspect a lighting interface (21) for a vehicle (1) and trailer (2) combination is provided, wherein the trailer has a plurality of lighting circuits (22, 23, 24) including at least one of a stop signal and direction indicator signals to be powered by the vehicle, wherein the vehicle is arranged to detect the presence of the trailer by detecting a path to ground through a bulb of at least one of the lighting circuits, the interface comprising circuitry (100, 63) for providing a path to ground for the or each circuit within a predetermined resistance range, irrespective of the condition of the lighting circuit. |
