Electronic control device.

摘要

An electronic control device (10) utilizes a plurality of conductive areas (72) on an associated printed wiring board (70) to create integral dew sensors (45; 62). The dew sensors are created by providing parallel conductive surfaces (46, 47; 63, 64) that are connected in turn by a resistor (44; 64) to a high impedance switch in the form of the gate (43; 61) of a field effect transistor (40; 60). In the event that moisture vapor or dew is present in the control device, a conductive path is created that causes the control device to shut down in a safe or alternate mode from the normal mode of operation (Figure 2).