Abstract: A control system for an industrial vehicle includes a badge communicator and an information linking device. The badge communicator has a transceiver for short range communication with electronic badges that are within in a fixed short range of the badge communicator, defining a first zone. The information linking device is programmed to execute program code. The program code extracts a current state of an operating parameter read from an industrial vehicle network bus, generates a second zone within the first zone that is defined based upon the extracted industrial vehicle operating parameter, detects a presence of an electronic badge within the first zone, determines whether the electronic badge is within the second zone, performs a first action if the detected electronic badge is not within the second zone, and performs a second action if the electronic badge is within the second zone.

Abstract: A constant current driving circuit and a corresponding photoelectric smoke alarm circuit are provided. The constant current driving circuit includes a reference voltage source module (1), a linear voltage regulator module (3), a level conversion module (2), a current mirror module (4) and a first NMOS transistor. The linear voltage regulator module (3) may control turning on and turning off thereof according to actual requirements, thus electrical energy loss may effectively be reduced for some periodically used devices. The constant current driving circuit and the corresponding photoelectric smoke alarm circuit may provide a constant current source, so that auxiliary output performance remains stable within a full temperature range, a certain timing sequence requirement is met, no standby power is consumed when not working, performance is stable, power consumption is low, and application range is wide.