| 摘要 |
PROBLEM TO BE SOLVED: To make it possible to decrease the number of wires between an electronic controller and a sensor device to dispense with ID setting for communication.SOLUTION: A pressure signal is superimposed on a communication signal on one signal line 12 per injector 3. An output circuit 16 of each injector 3 transmits the voltage signal at a voltage in response to a fuel pressure detected by a sensor 11 to an ECU 4. A communication driver 17 transmits the communication signal with the communication signal superimposed on a sensor signal by switching a state of the signal line 12 between a driven state and a non-driven state, compares a voltage of the signal line 12 with a threshold voltage Vt1, and receives the communication signal. An input circuit 34 of the ECU 4 samples and holds the voltage of each signal line 12 when a received signal or transmit signal of a communication driver 35 changes from L to H. The communication driver 35 compares the voltage of each signal line 12 with a threshold voltage Vt2 and receives the communication signal. The threshold voltages Vt1 and Vt2 are set on the basis of a voltage level of the pressure signal. |
