Continuous Variable Valve Duration Apparatus for Engine Knocking Prevention

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Solution Overview

Problem

Existing continuous variable valve technologies, such as CVVL and CVVT, have complex configurations and high manufacturing costs, and struggle to effectively prevent engine knocking.

Innovation Solution

A continuous variable valve duration apparatus with a simple configuration, featuring wheels and cam devices on a camshaft, adjustable slider housings, and a control system using a motor and guide device to adjust valve timing and duration, allowing for control of the engine's compression ratio to prevent knocking.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If CVVL or CVVT apparatus is used to adjust valve operation in accordance with engine RPM, then valve timing control capability is improved, but device complexity and manufacturing cost increase

Engineering Contradiction:

Improvevalve timing control capabilityVSAvoidconfiguration complexity

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The camshaft is divided into multiple independent cam devices (first cam device, second cam device, etc.), each corresponding to different cylinders. Each cam device can be independently adjusted along the camshaft axis, allowing separate control of valve timing for different cylinder groups. This segmentation enables complex valve timing control while keeping each individual cam device relatively simple in structure.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The cam devices are made dynamically adjustable along the camshaft axis through adjustable members that can change position. The adjustable members include adjustment holes with variable positions, allowing the cam devices to be dynamically repositioned to achieve different valve timing configurations. This dynamic adjustability provides versatility without requiring completely separate camshafts for each timing configuration.

Inventive Principle:

Principle #15Dynamics

2Adaptability or versatility

If CVVL or CVVT apparatus is used to adjust valve operation, then valve timing control capability is improved, but manufacturing cost increases

Engineering Contradiction:

Improvevalve timing control capabilityVSAvoidmanufacturing cost

Core Design Contradiction:

Adaptability or versatilityVSEase of manufacture

Solution Approach 1:

The adjustable members serve multiple functions: they position the cam devices along the camshaft axis, provide adjustment holes for timing configuration, and enable both CVVT (variable valve timing) and CVVL (variable valve lift) functionality through the same structural elements. This multi-functionality reduces the need for separate components for different control functions, thereby lowering manufacturing costs while maintaining versatility.

Inventive Principle:

Principle #6Universality (Multi-functionality)

Solution Approach 2:

The adjustable members are nested within the cam devices, with adjustment holes positioned within the cam device structure. The guide slots are nested within the adjustable members, allowing sequential adjustment mechanisms to be compactly integrated. This nesting reduces the overall component count and assembly complexity, leading to lower manufacturing costs.

Inventive Principle:

Principle #7Nested doll (Nesting)

3Speed

If CVVT technique is used to change valve timing, then valve timing adjustment is achieved, but valve duration remains fixed and knocking prevention capability is limited

Engineering Contradiction:

Improvevalve timing adjustmentVSAvoidvalve duration control capability

Core Design Contradiction:

SpeedVSAdaptability or versatility

Solution Approach 1:

The adjustment holes in the adjustable members are pre-positioned at specific locations along the camshaft axis, corresponding to predetermined valve timing configurations. By selecting which adjustment hole to engage, the system preliminarily sets both the timing and duration parameters. This preliminary configuration approach allows simultaneous control of valve timing and duration without requiring continuous adjustment mechanisms for both parameters.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The invention adds the camshaft axis dimension to the traditional valve timing control. While conventional CVVT adjusts timing by rotating the camshaft, this invention adjusts both timing and duration by translating cam devices along the camshaft axis. This dimensional change from rotational adjustment to axial translation enables independent control of valve timing and duration parameters.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

Data Source

PatentUS9803519B2Continuous variable valve duration apparatus and control method using the same

Publication Date: 2017.10.31 HYUNDAI MOTOR CO LTD

AI summary

A control method using a continuous variable duration apparatus provided to adjust opening duration of an intake valve of an engine includes: determining a reduction amount of a compression ratio to prevent knocking, when knocking of an engine is expected, setting a desired effective compression ratio required for the reduction amount of the effective compression ratio, setting desired duration for the set desired effective compression ratio, and controlling duration of the intake valve on the basis of the set desired duration.