Electronic Control Units for Vehicles

Abstract

Some embodiments protect aluminum electrolytic capacitors without increasing the thickness or height dimension of a unit case of an onboard electronic control unit, which is provided with the unit case and a circuit board on which the aluminum electrolytic capacitors are mounted. The circuit board includes a first surface and a second surface, and the unit case houses the circuit board. The unit case includes a first main wall facing the first surface, a second main wall facing the second surface, and perimeter walls. The capacitors are mounted on the second surface so as to extend along a specific periphery of the circuit board and be mutually connected in parallel. The unit case has a height dimension capable of housing the aluminum electrolytic capacitors without the aluminum electrolytic capacitors contacting the inside surface of the second main wall.

Description

technical field [0001] The present invention relates to a vehicle-mounted electronic control unit, which includes a circuit board for electronic control and is mounted in, for example, a housing of an electrical connection box provided in a motor vehicle. Background technique [0002] With the electronicization of vehicles in recent years, electronic control units for vehicles incorporating electronic control circuits are widely used. For example, Patent Document 1 discloses an electronic control unit mounted on a case of an electrical junction box provided in an automobile or the like for vehicle use. The electronic control unit incorporates a circuit board for electronic control, and is electrically connected to a circuit structure such as a bus bar board housed in the case through a case mounted on the electrical connection box. [0003] The electronic control unit has the circuit board and a unit case housing the circuit board. The unit case is generally divided into a...

AI Technical Summary

Problems solved by technology

This is a big hindrance to the reduction of the thickness dimension of the unit case

In addition, increasing the thickness of the unit case to increase the rigidity in order to suppress the above-mentioned deflection displacement leads to an increase in material cost and overall weight, and hinders weight reduction and cost reduction.

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