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Rocker arm motion detection for diagnostic feedback and control

A rocker arm assembly, a range of technologies, applied in the field of valve trains

Active Publication Date: 2020-05-01
EATON INTELLIGENT POWER LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In these systems, each rocker arm assembly has two hydraulic feeds, which requires a certain degree of complexity and equipment cost
The oil requirements of these hydraulic feed units can approach the limits of existing supply systems

Method used

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  • Rocker arm motion detection for diagnostic feedback and control
  • Rocker arm motion detection for diagnostic feedback and control
  • Rocker arm motion detection for diagnostic feedback and control

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0020] Figure 1-4 The valve train 100 is shown with a rocker arm assembly 106 . Each rocker arm assembly 106 includes two rocker arms, an outer arm 103A and an inner arm 103B, and a cam follower 110 . The valve train 100 is applicable to an internal combustion engine of the type having a combustion chamber, movable valves having seats formed in the combustion chamber, and a camshaft. Rocker arm assembly 106 may be mounted on pivot 140 in such an internal combustion engine in a configuration in which a cam (not shown) on the camshaft engages cam follower 110 as the camshaft rotates. Action of the cam on cam follower 110 operates to actuate inner arm 103B. If the outer arm 103A is also actuated, the movable valve can be opened and closed.

[0021] The rocker arm assembly 106 may be a cylinder deactivating rocker arm. refer to figure 2 , cylinder deactivation is controlled by electromagnetic latch assemblies 20 , one of which is mounted to each of the rocker arm assemblies...

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PUM

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Abstract

A method of operating an internal combustion engine having an electrical circuit that includes a connection closed by abutment between two distinct parts, one of which is mounted to a rocker arm of arocker arm assembly and another that is mounted to a part distinct from the rocker arm. The connection is structured such that the movement of the rocker arm causes relative motion between the surfaces of the distinct parts that close the connection. The relative motion causes the circuit resistance to transition between values within a first range and values within a second range. The transitionsof resistance between those ranges are detected and their presence, absence, or timing used for purposes of providing diagnostic feedback or control.

Description

technical field [0001] The present teachings relate to valvetrains, particularly valvetrains that provide variable valve lift (VVL) or cylinder deactivation (CDA). Background technique [0002] Hydraulically actuated latches are used on some rocker arm assemblies to achieve variable valve lift (VVL) or cylinder deactivation (CDA). For example, some shift roller finger followers (SRFF) use hydraulically actuated latches. In these systems, pressurized oil from an oil pump can be used for latch actuation. The flow of pressurized oil is regulated by an oil control valve (OCV) under the supervision of the engine control unit (ECU). A separate feed from the same source provides oil for hydraulic clearance adjustment. In these systems, each rocker arm assembly has two hydraulic feeds, which entails a certain degree of complexity and equipment cost. The oil requirements of these hydraulic feed devices can approach the limits of existing supply systems. [0003] The complexity a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F01L13/00F01L1/18
CPCF01L1/18Y02T10/12Y02T10/40F01L2201/00F01L2305/00F01L2001/186F01L2301/00F01L1/047F01L13/0005F01L2013/101F01L1/22F01L3/06F01L2820/045F02D41/22
Inventor 彼得·利斯卡尔
Owner EATON INTELLIGENT POWER LTD