DE102007045196A1 - Internal combustion engine has air intercooler, which has cooler outlet area, where cooler outlet area has exhaust casing and multiple outlet elbows - Google Patents

Abstract

The internal combustion engine has an air intercooler (1), which has a cooler outlet area. The cooler outlet area has an exhaust casing and multiple outlet elbows (9). A cylinder head (2) is provided, which has an air intake channel to supply charge air into the combustion chamber. An electrical heating element (10) is arranged in the cooler outlet area for temporary pre-heating of the charge air.

Description

The The invention relates to an internal combustion engine with a charge air cooler and a cylinder head, which abut each other directly, according to the preamble of claim 1 and claim 7.

From the DE 10 2005 030 850 A1 an internal combustion engine is known in series arrangement, in which a cylinder head and a charge air cooler are arranged directly adjacent to each other and form a continuous charge air gas duct. The charge air flows from the intercooler directly, ie without charge air manifold, into the air inlet channel of the cylinder head and from there to the combustion chamber. The charge air cooler includes a radiator inlet portion, a radiator matrix, and a radiator outlet portion. The radiator inlet region, in turn, is composed of an intake manifold for connection to a compressor and an inlet housing. In the radiator matrix, the heat transfer from the charge air takes place in a second medium, for example water. The radiator outlet area is composed of an outlet housing and a plurality of exhaust manifolds, which then abut the respective cylinder head. An advantage is the high packing density of the internal combustion engine with the ancillaries, since a cuboid space is almost completely filled.

In practice, internal combustion engines are equipped with a charge-air preheating. The charge-air preheating allows the cold start and serves for white smoke suppression at low engine temperatures. Known devices for charge air preheating are the flame start system, glow plugs or electrical heating elements. The latter can either be connected upstream of the charge air manifold on a separate bracket or arranged in the charge air manifold itself. Such solutions are for example from the DE 601 08 178 T2 known. The common feature of these devices for preheating the charge air is the additional space requirements, making these facilities for the out of the DE 10 2005 030 850 A1 known internal combustion engine can not be used.

Of the Invention is therefore based on the task for the previously described internal combustion engine, a charge air preheating to design.

The Task is by an internal combustion engine with the characteristics of Claim 1 and the features of claim 7 solved. The Embodiments are in the dependent claims shown.

at the first solution is an electric heating element for temporary preheating of the charge air in the radiator outlet area arranged. In a first type for this purpose, the electric heating element as one-piece component arranged in the outlet housing and extends over the entire length of the Outlet housing. The entire charge air flow is therefore before leaving the intercooler with a single electric Preheated heating element. Alternatively, there is the electrical Heating element of individual, locally and electrically against each other insulated, heating elements, each with an electric heating element associated with an exhaust manifold. In a second design is the electric heating element in the exhaust manifold of the intercooler accommodated. The electric heating element can be considered from the outside accessible plug-in unit in the exhaust manifold be executed. This belongs to both types electric heating element to the scope of functions of the intercooler. The intercooler including the electric Heating element can therefore be purchased as a pre-assembled module from a supplier become. In the first solution according to the invention is advantageous that no further mechanical adjustment work is required on the crankcase of the internal combustion engine.

at the second solution is the electric heating element for temporary preheating of the charge air in the air inlet duct arranged the cylinder head. Again, the electric heating element as an integral part of the cylinder head or as a plug-in unit be executed.

The Integration of the charge air preheating happens within the given space, so without increasing the space for the Overall arrangement consisting of the internal combustion engine and the ancillaries. Since the electrical heating element in the activated state no oxygen consumed, the mixture formation is not adversely affected. This is, for example, when used in large geodesic Height of advantage. A good system adaptation is thereby achieved that the electric preheating in power levels can be operated, for example, at low engine and intake air temperature (Cold start) with maximum electrical power and in decreasing Performance levels in the watercourse phase for white smoke suppression.

In The figures show the preferred embodiments. Show it:

1 a charge air cooler with cylinder head according to the first embodiment of the invention,

2 the intercooler as a functional unit,

3 the charge air cooler the 1 in a first design,

4 the charge air cooler the 1 in a second type,

5 a charge air cooler with cylinder head according to the second embodiment of the invention,

6 the cylinder head of the 5 in a first type and

7 the cylinder head of the 5 in a second design.

The 1 shows the intercooler 1 with the cylinder head 2 according to the first embodiment of the invention as a mounted assembly. In the first embodiment of the invention is an electric heating element 10 in the intercooler 1 arranged. The intercooler 1 and the cylinder head 2 come directly - without the interposition of a charge air pipe - to each other to the plant. The cylinder head 2 can be designed as a one-piece component or - as shown - be completed from single cylinder heads. The illustrated intercooler 1 has five exhaust manifolds 9 within which a charge-air gas guide channel is arranged. This communicates with the respective air inlet channel in the cylinder head 2 , These therefore form a continuous charge-air gas duct from the intercooler to the combustion chamber of the internal combustion engine. The intercooler is executed 1 as an air-water cooler, in which the heat transfer from the charge air into the water takes place. The water supply is marked with the reference WATER CLOSED. The supply of the charge air from a compressor, reference numeral LL ZU, via an intake manifold 6 ,

The 2 and 3 show the intercooler 1 of the 1 as a first embodiment of the invention in a first type. In the first type is the electric heating element 10 in the radiator outlet area of the intercooler 1 arranged. In the 2 is the intercooler 1 shown schematically as a functional unit. The 3 shows the specific embodiment of this in perspective view with partial elevation. The further description is for the two 2 and 3 together.

The intercooler 1 includes a radiator inlet area 3 , a cooler matrix 4 and a radiator outlet area 5 , please refer 2 , The radiator inlet area 3 in turn sits down from the intake manifold 6 and an inlet housing 7 together. About the intake manifold 6 the charge air is supplied. In the figures, this is indicated by an arrow and the reference LL ZU. In the cooler matrix 4 the heat transfer takes place. The flow of water through the radiator matrix 4 is in the 2 indicated by arrows with the symbols WATER CLOSED and WATER AB. The radiator outlet area 5 is made up of an outlet housing 8th and the exhaust manifolds 9 together. Due to the elevation is in the 3 from the five exhaust manifolds 9 with two exhaust manifolds, only part of the lower connection surface is visible. About the exhaust manifold 9 is the charge air from the intercooler 1 dissipated. In the figures, this is indicated by an arrow and the reference LL AB.

In the first type of intercooler 1 is the electric heating element 10 inside the outlet housing 8th arranged and thus an integral part of the intercooler 1 , About the electric heating element 10 the charge air is preheated in a cold start, which allows the start at low temperatures and the white smoke is suppressed. Like in the 3 represented, the electric heating element is set 10 composed of individual heating elements, which are locally and electrically isolated from each other. Every exhaust manifold 9 is an electric heating element 10 assigned. For example, the exhaust manifold 9.1 the electric heating element 10.1 assigned. From an electronic heating element controller, not shown, each electrical heating element 10 be acted upon by a drive signal U. In practice, the drive signal is designed as a PWM signal, in which the amount of heat generated in the electrical heating element is controlled by means of the pulse-pause ratio. Via the PWM signal, the electric heating element can be operated in power stages, whereby a targeted adjustment of the charge air preheating is possible. The charge air preheating can therefore be activated in each operating point of the internal combustion engine to optimize the combustion process. The of the heating element 10.1 heated charge air flows over the exhaust manifold 9.1 in the air inlet duct 12.1 of the cylinder head 2 , The intercooler 1 and the cylinder head 2 therefore form - as in 3 shown - a common charge air gas duct. The individual electrical heating elements can also be connected in a conductive manner to an entire electrical heating element, which then extends over the entire length of the outlet housing 8th extends.

In the 4 is the intercooler 1 of the 1 shown in a second type. The second type differs from the first type ( 2 and 3 ) in that the electric heating element 10 in the exhaust manifold 9 as plug-in unit 11 is arranged. The plug-in unit 11 Can for service purposes - viewed in the direction of drawing upwards - from the exhaust manifold 9 be pulled out. For example, the exhaust manifold 9.1 the plug-in unit 11.1 with the electric heating element 10.1 assigned. The individual electrical heating elements 10 can also individually in this design via an unillustrated electronic heating element control unit with a Ansteu Ersignal U be acted upon.

The 5 shows a charge air cooler 1 with cylinder head 2 according to the second embodiment of the invention as a mounted unit, in which also the intercooler 1 directly - without the interposition of a charge air tube - on the cylinder head 2 is applied. In the second embodiment of the invention, the electric heating element 10 in the air inlet duct 12 of the cylinder head 2 arranged. The illustrated intercooler 1 has five exhaust manifolds 9 within which a charge-air gas guide channel is arranged. This communicates with the respective air intake duct 12 of the cylinder head 2 , These therefore form a continuous charge-air gas duct from the intercooler to the combustion chamber of the internal combustion engine.

The 6 shows the cylinder head 2 of the 5 in a first design, in which for better understanding of the cylinder head 2 in the area of the air inlet channel 12 is shown in elevation. Inside the air inlet duct 12 is the electric heating element 10 as an integral part of the cylinder head 2 arranged. The electric heating element is activated 10 by an unillustrated electronic heating element control unit.

The 7 shows the cylinder head 2 of the 5 in a second design. Again, the cylinder head 2 in the area of the air inlet channel 12 shown in elevation. The second type differs from the first type ( 6 ) in that the electric heating element 10 here as a plug-in unit 11 is executed. The plug-in unit 11 is accessible from the outside and therefore easy to service. The air inlet duct 12 surrounding housing was shortened accordingly, so that the installation space despite insertion unit 11 could be kept unchanged.

• – Die Integration der Ladeluft-Vorwärmung geschieht innerhalb des gegeben Bauraums, also ohne Bauraumzunahme;
• – Das elektrische Heizelement hat keine Auswirkung auf die Gemischbildung, was beim Betrieb in großer geodätischer Höhe von Vorteil ist;
• – Die Erfindung kann als Nachrüstsatz angeboten werden;
• – Durch die Aussteuerung in Leistungsstufen ist eine gezielte Systemanpassung möglich, zum Beispiel mit hoher elektrischer Leistung beim Motorstart und abnehmender elektrischer Leistung in der Warmlaufphase zur Weißrauchunterdrückung.

In summary, the description of the invention provides the following advantages:

• - The integration of the charge air preheating happens within the given space, so without space increase;
• - The electrical heating element has no effect on the mixture formation, which is advantageous for operation in large geodesic height;
• - The invention can be offered as a retrofit kit;
• - By the modulation in power levels targeted system adaptation is possible, for example, with high electrical power at engine start and decreasing electrical power in the warm-up phase for white smoke suppression.

1

Intercooler

2

cylinder head

3

Cooler inlet area

4

radiator matrix

5

Cooler outlet

6

intake manifold

7

inlet casing

8th

outlet housing

9

exhaust manifold

9.1

exhaust manifold

10

electrical heating element

10.1

electrical heating element

11

withdrawable unit

11.1

withdrawable unit

12

Air intake channel

12.1

Air intake channel

QUOTES INCLUDE IN THE DESCRIPTION

This list The documents listed by the applicant have been automated generated and is solely for better information recorded by the reader. The list is not part of the German Patent or utility model application. The DPMA takes over no liability for any errors or omissions.

Cited patent literature

• - DE 102005030850 A1 [0002, 0003]
• - DE 60108178 T2 [0003]

Claims (8)

Internal combustion engine with a charge air cooler ( 1 ) which has a radiator outlet area ( 5 ), consisting of a discharge housing ( 8th ) and a plurality of exhaust manifolds ( 9 ), and with a cylinder head ( 2 ), which has an air inlet duct ( 12 ) for supplying the charge air into the combustion chamber, wherein the intercooler ( 1 ) and the cylinder head ( 2 ) abut each other directly to form a continuous charge-air gas-carrying channel, characterized in that in the cooler outlet region ( 5 ) an electric heating element ( 10 ) is arranged for temporary preheating of the charge air. Internal combustion engine according to claim 1, characterized in that the electric heating element ( 10 ) in the outlet housing ( 8th ) is arranged. Internal combustion engine according to claim 2, characterized in that the electric heating element ( 10 ) integrally over the entire length of the outlet housing ( 8th ). Internal combustion engine according to claim 2, characterized in that a plurality of electrical heating elements ( 10 ) locally and electrically isolated from each other in the outlet housing ( 8th ) are arranged, wherein in each case an electrical heating element ( 10 ) an exhaust manifold ( 9 ) assigned. Internal combustion engine according to claim 1, characterized in that the electric heating element ( 10 ) in the exhaust manifold ( 9 ) is arranged. Internal combustion engine according to claim 5, characterized in that the heating element ( 10 ) as a plug-in unit ( 11 ) in the exhaust manifold ( 9 ) is arranged. Internal combustion engine with a charge air cooler ( 1 ) which has a radiator outlet area ( 5 ), consisting of a discharge housing ( 8th ) and a plurality of exhaust manifolds ( 9 ), and with a cylinder head ( 2 ), which has an air inlet duct ( 12 ) for supplying the charge air into the combustion chamber, wherein the intercooler ( 1 ) and the cylinder head ( 2 ) abut one another directly, forming a continuous charge-air gas guide channel, characterized in that in the air inlet channel ( 12 ) of the cylinder head ( 2 ) an electric heating element ( 10 ) is arranged for temporary preheating of the charge air. Internal combustion engine according to claim 7, characterized in that the electric heating element ( 10 ) as a plug-in unit ( 11 ) in the air inlet duct ( 12 ) is arranged.