Patent ID: 9404433
Filing Date: 2016-08-02
CPC Classification: B60R,F02D

Claim Text:
1. A control device equipped with multiple grounds comprising: an electronic control unit that processes an electric signal from a sensor detecting a physical value, and outputs an electric signal to control a control target; a box-shaped housing that comprises a conductive material and that accommodates the electronic control unit; and a mounting stay that supports the housing, that comprises a conductive material and that is electrically connected to a vehicle body at a connection portion, wherein the electronic control unit includes an internal ground electrically connected to the housing and a power circuit that supplies electric power for driving the sensor, wherein the mounting stay has a first mounting part that extends along a first lateral part of the housing and a second mounting part that extends from one end of the first mounting part along a second lateral part of the housing, wherein the mounting stay is mountable on the vehicle body such that the connection portion is connected to an end of the second mounting part which is distal from the one end of the first mounting part, wherein the housing is electrically connected to the first mounting part and the second mounting part at the first lateral part and the second lateral part respectively, wherein the internal ground is divided into a first internal ground provided inside of the housing on a side of the second mounting part so as to be near the connection portion, and a second internal ground provided inside of the housing on a side of the first mounting part, wherein the first internal ground is electrically connected via the housing to the second mounting part and the second internal ground is electrically connected via the housing to the first mounting part so that the electrical distance from the connection portion to the second internal ground is farther than the electrical distance from the connection portion to the first internal ground, wherein a ground of the control target is connected to the first internal ground, wherein a ground of the power circuit is connected to the second internal ground, and wherein a ground of the sensor is connected outside of the housing to the other end of the first mounting part at a position having an electrical distance from the connection portion that is farther than the first internal ground.