| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a sensor control device and a sensor control system capable of reducing the influence by disturbance and reducing fluctuations of sensor output. <P>SOLUTION: In a sensor control device 2, a GND 1 terminal of a signal-system circuit and a GND 2 terminal of a power-system circuit are separately arranged, and a power system ground and a signal system ground are made independent to each other in an electric circuit for connecting a circuit board 20 with ECU 9 and a battery 8. In addition, one end of condensers 301 to 307 is connected to a signal line from an NOx sensor 10 and another end of the condensers 301 to 307 is connected to the signal system ground. Thus, even if an electronic device in which a large current flows such as a heater control circuit 28 and a motor 310 is connected to a power system ground, the influence of noise due to these electronic devices in which a large current flows on sensor output can be prevented, thereby improving the detection accuracy of a specific gas concentration. <P>COPYRIGHT: (C)2012,JPO&INPIT |
