| 摘要 |
A thermal fuse integrated into an electrical circuit powering a heater element having a positive temperature coefficient includes at least one terminal in electrical connection with the heater element thereby connecting the heater element to a power source, and a solder jacket that mechanically retains the electrical connection between the terminal and heater element, wherein a biasing load is applied to the terminal when retained by the solder jacket, and wherein the terminal breaks connection with the heater element under the force of the bias when the solder jacket melts should the heater element overheat. By selecting the solder material forming the solder jacket according to its melt temperature, a temperature specific overheat protection for a heated fuel injector can be provided. Since the injector's metering circuit is separate from the thermal fuse circuit, the fuel injector remains operational even after the heater circuit is opened. |
