A fuel injector for fuel injection systems of internal combustion engines and a method of manufacturing same are described. The acceleration speed detecting unit detects the acceleration speed of the wheel loader when the mode switching determining unit determines that it is required to switch between the engine output modes from a tow output mode to a high output mode based on a detection result of the travelling state detecting unit. The master station determines, on the basis of the results of ranging performed by the first and second controllers as well as reports from the slave stations, timings for the slave stations to transmit signals to the master station, and receives signals multiplexed through the optical fiber network from the slave stations. If the first user has not indicated any preference to exclude posts associated with the second user, a reference associated with the second user action is sent to the first user.