JPS59168216A - Electric circuit device provided in automobile engine room - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an electric circuit device disposed in an engine compartment of a motor vehicle as set forth in the generic concept of claim 1. In such a known circuit arrangement, the electrical circuit element to be cooled, i.e. the electrical circuit element to be cooled, in the form of a transistor is connected to the intermediate bottom wall with its connecting electrodes passing through openings in the intermediate bottom wall and the conductor plate. It is arranged so that it protrudes and can be accessed by the associated conductor track. A disadvantage of such a construction is that the high ambient temperatures, such as those found in the engine compartment of a motor vehicle, often do not allow the use of known circuit arrangements. Furthermore, the different coefficients of thermal expansion of different materials, such as metal housings and conductor plates made of synthetic materials, together with manufacturing tolerances and the effects of high vibrations caused by rough vehicle driving, can lead to stresses. ”: often suffers from damage.

Further, in order to cool the electric circuit elements, an electric circuit device is known in which a conductor plate carrying the electric circuit together with the electric circuit elements is arranged directly in the passage of air sucked into the air filter housing by the engine. . However, this electrical circuit arrangement has the disadvantage that its functionality is quickly impaired by moisture, which causes electrolysis, icing and corrosion. Particularly in the case of circuits directly exposed to suction air, it is difficult to draw out mechanical and electrical connections with a sufficiently high density. The electric circuit device according to the present invention having the above configuration has the following advantages over the conventional one. That is, by arranging the circuit element to be cooled so that the side not facing the conductive plate is in direct contact with the cooling part of the circuit device housing, the thermal resistance of this structural unit can be reduced. be. A further advantage is that by using the cooled circuit element as a housing for the conductor plate receptacle, the conductor plate can be placed within the housing frame with little stress and is also resistant to vibratory movements. It can be insensitive.

The configuration described in the following claims makes possible an advantageous development of the circuit arrangement described in the first claim. In particular, in order to reduce the thermal resistance of the circuit elements to be cooled, the circuit elements disposed in the cooling section are installed using thermally conductive paste, and in addition the circuit devices are directly exposed to suction air using their housing frame. It is particularly advantageous to arrange it outside the housing of the air quantity measuring part to be cooled.

According to an embodiment of the present invention, there is provided an electric circuit device according to claim 1, in which the housing frame is provided with a force-receiving force inserted between the housing frame and the intermediate bottom wall at the side portions.
It can be attached directly to the housing of the air amount measuring section with a wire.

Examples of the present invention will be described below.

The electric circuit device 1 has a metal housing frame made of die-cast aluminum, for example.

The housing frame 2 is formed with a partial intermediate bottom wall 3 . This intermediate bottom wall 3 is provided with a seed-shaped recess 4. A bearing surface 5 projects forward from the bottom of the recess 4.

The conductor plate 6 is provided with conductor tracks (not shown) in a manner known per se. Near the edge area of the conductor plate 6, a pink plug-in connection flag of the bipolar plug-in device is provided. The plug pin 7 passes through the plug socket 8 in a sealed manner and is attached to the associated conductor track. Furthermore, connection electrodes 9 for the cooled electrical circuit elements are attached to each associated conductor track. Here, as the electric circuit elements to be cooled, for example, the hybrid circuit 10 and the calculation device ζ
1 and a storage device 12. The connection flags of the plug-in pins 7 and the connection electrodes 9 of the cooled circuit elements 10, 11 and 12, as well as the circuit elements (not shown) arranged on the conductor plate 6, which are known per se, and the connections on the conductor plate 6. All connections between the conductor tracks are made during the mechanical brazing process. At least the connection electrodes 9 of the cooled circuit elements 10, 11 and 12 have pads in a manner known per se (not shown) on which conductor plates rest and are supported.

In this way, the cooled circuit elements 10, 11 and 12 are arranged with a distance from the conductor plate 6. In this way the connection means 7 as well as all circuit elements 10, ]
The printed circuit board 6 fitted with -1, l2 forms a structural unit that can be inserted automatically into the unlong frame 2 in a simple manner.

An opening 13 is formed in one wall of the housing frame 20, and a plug socket 8 is hermetically inserted into this opening with, for example, a seal 14 interposed therebetween, and the plug pin 7 is inserted into the housing frame 2. It projects into a receiving area 15 for a receptacle for a plug connector or a plug (not shown), which is known per se and is provided on the outside of the housing. When the plug-in socket 8 is inserted into the opening 13 and the conductor plate 6 is thereby installed in the housing frame 2, the cooled circuit elements 10.11 and ]-2 are located in the recess 4 of the intermediate base 3 in the position 1 to the conductor plate. 6
The side facing away from the side sits in the recess or recess 4. In that case, the hybrid circuit 10 has a slightly protruding bearing surface 5
”-, on the other hand, calculation and memory resolution ζ chair 1]-
and 12 are seated at the bottom of the recess 4. In this way, the cooled electrical circuit elements 1'o, 11 and 1.2 serve at the same time as carriers for the conductor plate 6. The conductor plate 6 is thus subject to manufacturing tolerances and different expansion coefficients It is disposed within the circuit device 1 without being affected.

The intermediate bottom wall 3 serves as a cooling member for the large surfaces of the cooled circuit elements 10, 11 and 12, which are also part of the housing frame 2.
．． In order to further reduce the thermal resistance of 11 and 12, these circuit elements within the recess are at least partially surrounded by a thermally conductive paste 16.

The intermediate bottom wall 3, together with the installed forceps 17, forms the bottom of an internal space 18 which accommodates the electrical circuit of the electrical circuit device. Furthermore, a cover 1 provided with a seal 20 interposed therebetween.
At 9, the interior space 18 and thus also the circuit arrangement 1 is closed to the outside.

The electrical circuit arrangement I serves, for example, as a control device for the ignition and injection device reservoirs, to which the circuit arrangement supplies input pulses from the air quantity measuring device.

The circuit arrangement 1 is therefore screwed directly with its mounting frame into the housing 21 of the air flow measuring unit (not shown) in a manner known per se.

The electrical circuit elements 10.11 and 12 to be cooled are disposed on the intermediate bottom wall 3 formed in the unong frame 2, which acts as a cooling member, and the circuit elements 10.11 and 12 to be cooled are arranged in a thermally conductive manner. By placing the electrical circuit arrangement 1 in the storage space 16 and directly attaching it to the housing 21 of the air quantity measuring part, the thermal resistance of the circuit elements 10, 11 and 12 is reduced by about 30 DEG C./W. As a result, the high ambient temperature for the circuit elements in the engine compartment of the motor vehicle as well as for the circuit arrangement 1 is only increased by about 15° C. with an acceptable power loss of less than 0.5 W;
．． 11.12 will not cause damage or adversely affect its function.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional view of an electric circuit device according to an embodiment of the present invention.

Claims (1)

[Claims] 1. The housing frame is formed with a partial intermediate bottom wall that acts as a cooling member, and at least one cooled electric circuit element of the electric circuit is mounted on the intermediate bottom wall, and the A motor vehicle in which the electric circuit elements are connected to electrical conductors of a conductor plate, on which the electric circuit elements are provided with integrated circuits and/or individual circuit elements and connection means.
In the electric circuit device disposed in the engine compartment of the invention, the intermediate bottom wall (3) has at least one recess (4), and at least one cooled electric circuit element (4) is disposed in the recess (4).
10, 11, 12) are mounted on the side facing away from the conductor plate (6), and the connecting electrode (9) of the cooled electrical circuit element is arranged as a carrier for the conductor plate (6). An electric circuit device installed in an engine compartment of an automobile, characterized in that: 2. Claims in which the electrical circuit elements to be cooled (10, 11, 12) are installed in a thermally conductive paste (16) applied in the recess (4) of the intermediate bottom wall (3) The electric circuit device according to item 1. 3. The cooled electrical circuit elements (10, 11, 12) are configured as computing units and/or memory units and/or circuits in hybrid and/or analog circuit form; or The electric circuit device according to item 2.