Device for adjusting the effective length of a connecting rod depending on the supply pressure
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A technology of effective length and supply pressure, which is applied in the direction of connecting rod, mechanical equipment, and control lubricant pressure, etc., can solve the problems of slow pressure change of supply pressure, limitation of VCR system efficiency, and impossibility of realization, so as to improve exhaust gas value , Improve the effect of cost reduction and space saving
Active Publication Date: 2020-02-11
IWIS MOTORSYSTEME GMBH & CO KG +1
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Problems solved by technology
Therefore, the pressure change of the supply pressure takes place very slowly and short switching times cannot be achieved
Due to this, the efficiency of the VCR system is limited
Method used
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[0038] figure 1 An internal combustion engine 1 , for example an Otto engine, is shown schematically. The internal combustion engine 1 has three cylinders 2.1, 2.2 and 2.3 in which a reciprocating piston 3.1, 3.2, 3.3 moves up and down. Furthermore, internal combustion engine 1 includes a crankshaft 4 which is rotatably mounted by means of crankshaft bearings 5.1-5.4. Crankshaft 4 is connected to associated reciprocating pistons 3.1, 3.2 and 3.3 by means of connecting rods 6.1, 6.2 and 6.3, respectively. For each connecting rod 6.1, 6.2 and 6.3, the crankshaft 4 has an eccentrically arranged crankshaft journal 7.1, 7.2 and 7.3. Large connecting rod bores 8.1, 8.2 and 8.3 are respectively supported on associated crankshaft journals 7.1, 7.2 and 7.3. The small connecting rod bores 9.1, 9.2 and 9.3 bear on piston pins 10.1, 10.2 and 10.3 respectively and are thus pivotably connected to the associated reciprocating pistons 3.1, 3.2 and 3.3.
[0039] The crankshaft 4 is provide...
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Abstract
The invention relates to a device for adjusting the effective length of a connecting rod (6.1, 6.2, 6.3) for an internal combustion engine (1), the device comprising at least one connecting rod (6.1,6.2, 6.3) which has a variable length and which can be locked in at least two length settings, at least one first oil pump (20) for supplying oil to the at least one connecting rod (6.1, 6.2, 6.3) with a variable length, and a control unit (100) which provides for a switchover between the length settings of the connecting rod (6.1, 6.2, 6.3) in the event of a change in the oil supply pressure forthe connecting rod (6.1, 6.2, 6.3). The aim of the invention is to shorten the switching times during a switchover between the length settings of the connecting rod (6.1, 6.2, 6.3). According to the invention, this is achieved in that at least one second oil pump (21) is provided which can be switched on when an oil supply is required for the at least one connecting rod (6.1, 6.2, 6.3) with a variable length or which takes over the oil supply for the at least one connecting rod (6.1, 6.2, 6.3) with a variable length, and the second oil pump (21) supplies a specified delivery flow at the momentof the activation of the oil supply for the connecting rod (6.1, 6.2, 6.3) or at the moment the second oil pump takes over the oil supply for the connecting rod (6.1, 6.2, 6.3). The invention additionally relates to a method for providing such a device for adjusting the effective length of a connecting rod (6.1, 6.2, 6.3).
Description
technical field [0001] The invention relates to a device for adjusting the effective length of a connecting rod for an internal combustion engine, the device comprising: at least one length-adjustable connecting rod lockable in at least two different length positions; at least one first an oil pump for the oil supply of the connecting rod; and a control unit providing switching between length positions of the connecting rod when the oil supply pressure of the connecting rod changes. [0002] The invention also relates to a method for operating such a device. Background technique [0003] Thermal efficiency η of internal combustion engine, especially gasoline engine TH and the compression ratio ε, that is, the ratio of the total volume before compression to the compressed volume (ε=(stroke volume V h + Compression volume V C ) / compressed volume V C )related. As the compression ratio increases, thermal efficiency also increases. The thermal efficiency decreases with incr...
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