JPH0547409U - Arrangement structure of control unit - Google Patents

Abstract

(57) [Summary] [Purpose] To provide a structure for disposing an engine control unit that can prevent vibration of an air cleaner, shorten the wiring distance of a harness, and do not need to open a through hole in a dash lower panel. is there. [Structure] By attaching the engine control unit 25 to the case upper surface portion 14b of the air cleaner 8,
Since the rigidity of the case upper surface portion 14b is increased, it is possible to prevent the film vibration of the case upper surface portion 14b. In addition, the engine control unit 25
Is arranged in the air cleaner 8 arranged in the engine room E, so that the harness 32 for connecting the engine control unit 25 to the engine 1 and the like,
Since the lengths of 33 and 34 are short, it is not necessary to form a through hole in the dash lower panel 35.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 This invention relates to an arrangement structure of a control unit.

[0002]

[Prior Art]

 As a conventional arrangement structure of a control unit, for example, an engine control unit, ones shown in FIGS. 4 and 5 are known. Reference numeral E indicates an engine room of the automobile, and the engine 1 is arranged in a horizontal position in the center of the engine room E. An intake manifold 2 which is branched into four pieces is provided at the rear of the engine 1, and a collector portion 3 is attached to the tip of the intake manifold 2. An injector 4 is provided in each intake manifold 2. The injector 4 is for injecting fuel, and is connected via a harness 7 to an engine control unit 6 (hereinafter referred to as unit 6) arranged on the vehicle compartment R side behind the dash lower panel 5. .. That is, the harness 7 supported by a bracket (not shown) near the intake manifold 2 is routed to the unit 6 through the through hole 5 a of the dash lower panel 5. The reason why the unit 6 is thus arranged on the side of the vehicle compartment R is for waterproofing, and the through hole 5a provided in the dash lower panel 5 is not affected by odor, water, or noise in the engine room E. Strict sealing treatment is applied so that it does not leak to the R side of the passenger compartment. The unit 6 controls the engine 1 and the transmission (not shown), and controls, for example, the fuel injection amount of the injector 4.

The fuel injected from the injector 4 is sent to the inside of the cylinder of the engine 1 together with the clean air required for combustion. For example, a device for supplying the clean air is, for example, the utility model 1-99964. Is an air cleaner 8 known from. The air cleaner 8 is installed on the shelf 10 of the left hood ridge panel 9 of the engine room E via a rubber stand 11 for vibration isolation. An air duct 12 extends from the air cleaner 8 toward the engine 1. The air duct 12 is connected to a throttle chamber 13 at the end of the collector section 3.

The air cleaner 8 has a structure in which a filter element 17 is housed in a case 16 composed of an upper case 14 and a lower case 15. The filter element 17 is sandwiched between the upper case 14 and the lower case 15 in an oblique state. Due to this filter element 17, the internal space of the air cleaner 8 is an upstream space into which the outside air A1 enters. It will be divided into S1 and the downstream space S2 from which the clean air A2 exits. Since the inner space of the air cleaner 8 is thus divided by the filter element 17, the upstream space S1 includes the outer side surface portion 15a and the bottom surface portion 15b of the lower case 15, and the downstream side space S2 includes the central side surface portion of the upper case 14. 14a and the upper surface part 14b will be included. An air introduction duct port 15c is provided in the outer side surface portion 15a of the upstream side space S1, and an air supply duct port 14c is provided in the central side surface portion 14a of the downstream side space S2. The air supply duct port 14c is provided with an air flow meter 18 for measuring the flow rate and temperature of the clean air A2, and the air duct 12 is connected to the air flow meter 18. The air flow meter 18 is connected to the unit 6 via a harness 19 so as to transmit the detected signals relating to the flow rate and temperature of the clean air A2 to the unit 6. Reference numeral 20 denotes a power supply outlet, and a power supply harness 21 extending from the power supply outlet is bundled together with the harness 19 of the air flow meter 18 into the harness 7 extending from the engine 1 to the unit 6 from the intermediate portion 7a. ing. It should be noted that FIG. 22 is a hood for covering the engine room E, and is located immediately above the air cleaner 8.

[0005]

[Problems to be solved by the device]

 Considering the vibration-proof measures of the air cleaner 8 in the prior art as described above, the bottom portion 15b of the lower casing 15 is fixed to the shelf 10 by the rubber base 11, so that the membrane vibration does not occur. Further, since the duct openings 15c and 14c are formed in the outer side surface portion 15a of the lower case 15 and the central side surface portion 14a of the upper case 14, respectively, the duct openings 15c and 14c have a rib effect. The outer side surface portion 15a and the central side surface portion 14a also do not cause membrane vibration. However, since the vibration from the engine 1 is easily transmitted to the upper surface portion 14b of the upper case 14, the upper surface portion 14b merely causes a flat plate shape, so that the upper surface portion 14b causes a membrane vibration, and the membrane vibration propagates air. It was transmitted to the hood 22 nearby. Therefore, in order to prevent this, it is necessary to increase the plate thickness of only the upper surface portion 14b, or to form a reinforcing rib for vibration isolation separately, which results in the moldability and cost of the case 16. Is disadvantageous. Even if the plate thickness of the upper surface portion 14b is increased or the reinforcing ribs are formed, the height of the air cleaner 8 is increased by that amount, and the height position of the hood 22 is also increased accordingly. It will also affect the overall design of.

On the other hand, since the unit 6 is disposed on the vehicle compartment R side behind the dash panel 5 due to a waterproof requirement, the distance from the unit 6 to the engine 1, the air flow meter 18, etc. is long, and the harness is accordingly increased. The length of 7, 19, and 21 is inevitably long, which is disadvantageous in terms of cost and weight. Further, since the through hole 5a must be provided in the dash panel 5 in order to guide the harnesses 7, 19, 21 from the engine room E to the passenger compartment R side, the sound, smell, etc. can be heard from the passenger compartment R through the through hole 5a. It was necessary to perform a strict sealing process so that it would not leak to the side, and the work of installing the harnesses 7, 19, 21 was extremely troublesome.

The present invention has been made in view of such a conventional technique, and it is possible to take measures against vibration of an air cleaner without increasing the plate thickness of the upper surface of the case or forming ribs. It is possible to shorten the wiring distance of the harness and to provide a control unit disposition structure that does not require a through hole in the dash lower panel.

[0008]

[Means for Solving the Problems]

 In order to achieve the above-mentioned object, the arrangement structure of the control unit according to the present invention is such that the control unit is arranged in the space on the downstream side of the air cleaner. Specifically, the inner space of the air cleaner installed in the engine room is partitioned by a filter element into an upstream space and a downstream space that includes at least a part of the upper surface of the case, and the control unit is installed as described above. It is attached to the upper surface of the case in the downstream space.

[0009]

[Action]

 By mounting the control unit on the upper surface of the case of the air cleaner, the rigidity of the upper surface of the case is increased, so that it is possible to prevent the occurrence of membrane vibration of the upper surface of the case.

Further, since the control unit is arranged in the air cleaner arranged in the engine room, the harness for connecting the control unit and the engine and the like can be short, and it is necessary to make a through hole in the dash lower panel. Nor.

Since the air cleaner originally has a watertight structure, the control unit is completely waterproof, and since this control unit is mounted on the upper surface of the case in the downstream space, the flow of clean air in the downstream space is small. Does not interfere with More conveniently, the flow of clean air removes the heat associated with the self-heating of the control unit, further improving the reliability of the control unit.

[0012]

【Example】

 A preferred embodiment of the present invention will be described below with reference to FIGS. The same parts as those in the prior art are designated by the same reference numerals, and a duplicate description will be omitted.

The engine control unit 25 (hereinafter referred to as the unit 25) according to this embodiment is arranged in the internal space of the air cleaner 8 installed in the engine room E. Specifically, as shown in FIG. 2, the unit 25 is attached to the upper surface portion 14b of the upper case 14 in the downstream space S2 of the air cleaner 8. As a result, the unit 25 is mounted above the duct port 14c. That is, the unit 25 is provided with two pairs of mounting pieces 26 on both side surfaces thereof, and each mounting piece 26 is mounted to the boss portion 27 projecting on the upper surface portion 14b by the bolt 28. An elongated opening 29 is provided in the central side surface 14a of the upper case 14, and the connector 30 of the unit 25 is projected from this. A sealing material 31 is provided in the gap between the elongated opening 29 and the connector 30 to maintain the watertightness of the case 16.

As described above, since the unit 25 is attached to the upper surface portion 14b of the upper case 14, the unit 25 functions as a kind of reinforcing plate of the upper surface portion 14b, and the membrane vibration of the upper surface portion 14b is performed. Will be reliably prevented. Therefore, the film vibration of the upper surface portion 14b does not propagate to the hood 22 through the air, which is very advantageous as a measure against sound and vibration around the engine room E. Further, in order to prevent the film vibration of the upper surface portion 14b, it is not necessary to increase the plate thickness of the upper surface portion 14b or specially provide reinforcing ribs, so that the height size of the air cleaner 8 is not increased and the hood 22b is not increased. Position can be kept low.

Further, since the unit 25 is arranged in the air cleaner 8, the distance between the unit 25 and the engine 1 becomes short, and therefore the length of the harness 32 connecting them is also short. As with the harness 32, the harness 33 from the air flow meter 18 and the length of the harness 34 for the power source are significantly shortened, and the weight can be reduced. Furthermore, since it is not necessary to provide through holes for the harnesses 32, 33, and 34 in the dash lower panel 35 as in the conventional case, it is advantageous in terms of sound and vibration countermeasures and waterproofing countermeasures of the dash panel 35. In particular, since the harnesses 32, 33, and 34 are not routed in a narrow place such as a conventional through hole, the wiring work of the harnesses 32, 33, and 34 is easy. In addition, since the routes of the harnesses 32, 33, 34 and the route of the air duct 12 are substantially the same, if the harnesses 32, 33, 34 and the air duct 12 are routed and piped together, the workability is further improved. Since the unit 25 is arranged in the air cleaner 8 which is originally a watertight structure, the waterproof property of the unit 25 is sufficiently ensured. Further, since the unit 25 is arranged in the downstream space S2 through which the clean air A2 flows, the unit 25 is not adversely affected by dust or the like.

Further, since the unit 25 is arranged by utilizing the internal space of the air cleaner 8 originally installed in the engine room E, the space in the engine room E is not particularly occupied and the engine room E is not occupied. It does not affect the layout of other devices in the system. Moreover, since the unit 25 is attached to the upper corner of the downstream space S2 in the air cleaner 8, it does not hinder the flow of the clean air A2 flowing in the downstream space S2. Further, the clean air A2 is discharged to the air duct 12 side while taking the heat generated from the unit 25, so that hot air due to self-heating of the unit 25 is not stored in the air cleaner 8. The unit 25 itself is always air-cooled with the clean air A2, so that the reliability of the unit 25 is improved.

The flow of the clean air A2 is not obstructed by the unit 25 as described above. However, when it is desired to rectify the clean air A2 specially, as shown by an imaginary line in FIG. The partition plate 36 may be provided in the case 16. Further, although the engine control unit 25 has been described in the present embodiment, the present invention is not limited to this, and may be a control component such as a transmission or chassis component.

[0018]

[Effect of the device]

 The arrangement structure of the control unit according to the present invention is as described above, and by mounting the control unit on the upper surface of the case of the air cleaner, the rigidity of the upper surface of the case is increased. Therefore, it is possible to prevent the occurrence of film vibration on the upper surface of the case. Also, because the control unit is installed in the air cleaner that is located in the engine compartment, the harness for connecting the control unit to the engine etc. is short, and it is not necessary to make a through hole in the dash lower panel. Absent.

[Brief description of drawings]

FIG. 1 is a plan view of an inside of an engine room showing an arrangement structure of a control unit according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view showing the internal structure of an air cleaner.

3 is a cross-sectional view taken along the line SA-SA shown in FIG.

FIG. 4 is a plan view corresponding to FIG. 1 showing a conventional control unit disposition structure.

FIG. 5 is a cross-sectional view showing the internal structure of a conventional air cleaner.

[Explanation of symbols]

8 Air Cleaner 14b Case Top 17 Filter Element 25 Engine Control Unit (Control Unit) E Engine Room S1 Upstream Space S2 Downstream Space A1 Outside Air A2 Clean Air

Claims (1)

[Scope of utility model registration request] 1. An internal space of an air cleaner installed in an engine compartment is partitioned by a filter element into an upstream space and a downstream space including at least a part of a case upper surface, and a control unit is provided in the downstream side. An arrangement structure of a control unit, characterized in that the control unit is attached to the upper surface of the case in the side space.