Internal combustion engine with heated actuating device for a movable cam carrier

The electromagnetic actuator with heating capabilities addresses the reliability issue of cam carrier displacement at low temperatures, ensuring reliable actuation of gas exchange valves in internal combustion engines, particularly after cold starts.

DE102022108568B4Active Publication Date: 2025-07-31VOLKSWAGEN AG
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Patent Information

Application Number
DE102022108568
Authority / Receiving Office
DE · DE
Patent Type
Patents
Current Assignee / Owner
Filing Date
2022-04-08
Publication Date
2025-07-31
Estimated Expiration
2042-04-08

AI Technical Summary

Technical Problem

Existing internal combustion engines face challenges in ensuring the functional reliability of the actuator for displacing the cam carrier, particularly at low ambient temperatures, which can lead to incomplete displacement during cold starts, affecting the actuation of gas exchange valves.

Method used

An electromagnetic actuator with a coil that can be electrically heated to maintain functionality, allowing for controlled displacement of the cam carrier, and a heating device to ensure actuator performance at low temperatures, independent of waste heat from the engine.

Benefits of technology

Ensures reliable actuation of gas exchange valves by maintaining actuator performance, enabling immediate and efficient operation of the internal combustion engine after cold starts, with a simple and functional design.

✦ Generated by Eureka AI based on patent content.

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Abstract

Internal combustion engine (1) with• at least one combustion chamber (9), to which at least one gas exchange valve (12) is assigned,• a camshaft (17) for actuating the gas exchange valve (12), wherein the camshaft (17) comprises a base shaft (26) and a cam carrier (25) which is axially displaceable on the base shaft (26),• an actuating device (27) for displacing the cam carrier (25) as required by means of at least one actuator (36) acting on the cam carrier (25), and• means for heating the actuator (36), wherein the actuator (36)• is designed to act electromagnetically, wherein an electrical coil (38) of the actuator (36) can be used as a heating means, and• comprises a guide pin (31) which can be brought into engagement with a guide groove (30) of the cam carrier (25) as required in order to enable displacement of the cam carrier (25). realize, characterized by a control device (24) which is designed toto use the coil (38) as a means for heating, to energise the coil (38) in such a way that no displacement of the cam carrier (25) is realized by energising the coil (38) when the internal combustion engine (1) is at a standstill in such a way that the guide pin (31) engages in the guide groove (30) and / or presses against the cam carrier (25).
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Claims

[1] Internal combustion engine (1) with • at least one combustion chamber (9) to which at least one gas exchange valve (12) is assigned, • a camshaft (17) for actuating the gas exchange valve (12), wherein the camshaft (17) comprises a base shaft (26) and a cam carrier (25) which is axially displaceable on the base shaft (26), • an actuating device (27) for moving the cam carrier (25) as required by means of at least one actuator (36) acting on the cam carrier (25) and • means for heating the actuator (36), wherein the actuator (36) • is designed to act electromagnetically, wherein an electric coil (38) of the actuator (36) can be used as a means for heating, and • comprises a guide pin (31) which can be brought into engagement with a guide groove (30) of the cam carrier (25) as required in order to effect a displacement of the cam carrier (25), characterized bya control device (24) which is designed to energize the coil (38) in such a way that no displacement of the cam carrier (25) is realized in order to use the coil (38) as a means for heating, by energizing the coil (38) when the internal combustion engine (1) is at a standstill in such a way that the guide pin (31) engages in the guide groove (30) and / or presses against the cam carrier (25). [2] Internal combustion engine (1) according to claim 1, characterized by that the heating means comprise a heating device (42). [3] Internal combustion engine (1) according to one of the preceding claims, characterized byin that the actuating device (27) has a first actuator (36) and a second actuator (36), each comprising a guide pin (31) which can be brought into engagement with a / the guide groove (30) as required, wherein an engagement of the guide pin (31) of the first actuator (36) causes the cam carrier (25) to be displaced into a first position and an engagement of the guide pin (31) of the second actuator (36) causes the cam carrier (25) to be displaced into a second position. [4] Internal combustion engine (1) according to claim 3, characterized by that the actuators (36) each comprise a coil (38), wherein only the coil (38) of the first actuator (36) is energized and wherein the first position is provided as the starting position for starting up the internal combustion engine (1).

Citation Information

Patent Citations

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    DE102012021631A1

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