Electronic control unit

An electronic control unit comprising:

• a multilayer circuit substrate;
• a metal base for securing the multilayer circuit substrate;
• and
• a resin cover for covering the multilayer circuit substrate together with the metal base;
• wherein the multilayer circuit substrate includes a signal pattern, a GND pattern, an important signal pattern, and an insulating layer;
• wherein the metal base is electrically connected to a vehicle body ground, and the GND pattern is disposed in a layer on the side of the resin cover rather than a layer in which the important signal pattern on the multilayer circuit substrate is disposed, in such a manner as to trace the important signal pattern, with the GND pattern formed having a width larger than that of the important signal pattern, thereby protecting the important signal pattern against electromagnetic waves.

An electronic control unit comprising:

• a multilayer circuit substrate;
• and
• a thermosetting resin for hermetically sealing the multilayer circuit substrate;
• wherein the multilayer circuit substrate includes a signal pattern, a GND pattern, an important signal pattern, and an insulating layer;
• and
• wherein the GND pattern is disposed in a layer on the side of the thermosetting resin rather than a layer in which the important signal pattern on the multilayer circuit substrate is disposed, in such a manner as to trace the important signal pattern, with the GND pattern formed having a width larger than that of the important signal pattern, thereby protecting the important signal pattern against electromagnetic waves.