Engine control device

Abstract

PROBLEM TO BE SOLVED: To provide an ECU superior in resistance to water and vibration.SOLUTION: An ECU 30 includes a circuit board 5 and a case 18. The circuit board 5 is supported in a floating state so as not to be in contact with the case 18. A supporting member is composed of an elastic member 12 made of rubber, a coil spring, or the like. Elastic members 12 are formed to protrude outwardly from side surfaces of the circuit board 5 and are supported onto inner wall surfaces of the case 18. A harness through hole 32 is formed in the case 18. A seal 33 is disposed between the harness through hole 32 and a harness 29 which is laid through the harness through hole 32. External connection electrodes 16 to which the harness 29 is connected are disposed on the circuit board 5. Resin mold is applied to a surface of the circuit board other than a portion on which the electrodes 16 are disposed and a portion on which the elastic members 12 are formed.

Description

technical field [0001] The present invention relates to an engine control device, and more particularly, to an engine control electronic device capable of improving both water resistance and vibration resistance of a circuit board on which electronic components are mounted. Background technique [0002] An engine control unit (hereinafter, referred to as “ECU”) is mounted on a motor vehicle, a motorcycle, or the like as an electronic device for controlling an internal combustion engine (engine). The ECU has a circuit board on which circuits including electronic components are mounted. Patent Document 1 proposes a structure in which, in an ignition device for an engine used in an environment where high and low temperatures are repeatedly applied, in order to prevent the thermal expansion coefficient difference between the circuit board and the circuit element and the potting resin from causing damage to the circuit A resin filler for stress relief is mixed in the potting res...

AI Technical Summary

Problems solved by technology

However, in the conventional structure, since the amount of potting material increases, it is considered that the weight increases and the cost increases

Moreover, insufficient consideration has been given to vibration resistance

In particular, two-wheeled motor vehicles are subject to more severe environmental conditions in terms of vibration of the body than four-wheeled vehicles such as passenger cars. Therefore, not only water resistance, but also vibration resistance and cost must be considered. fully consider

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