Electromagnetic Valvetrain Cylinder Deactivation
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Solution Overview
Problem
Valvetrain assemblies with valve bridges and multiple valves face challenges in achieving efficient cylinder deactivation, which is crucial for improving fuel consumption and engine efficiency.
Innovation Solution
A valvetrain assembly design incorporating a first and second body with latch pins, a movable shaft, and an electromagnet, where the electromagnet controls the movement of the shaft to latch and unlatch the pins, allowing for selective valve operation and cylinder deactivation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If traditional cam or rocker arm modification is used for cylinder deactivation, then the structure becomes complex, but the device complexity increases
Solution Approach 1:
The valvetrain assembly is segmented into a first body (rocker arm) and a second body (valve bridge), allowing independent control of different valve groups. The latch pin mechanism divides the valve bridge into sections that can be selectively latched or unlatched, enabling precise cylinder deactivation without modifying the entire valvetrain structure.
Solution Approach 2:
A latch pin is introduced as an intermediary component between the rocker arm and valve bridge. This latch pin can be selectively engaged or disengaged to control valve operation, providing a simple mechanism for cylinder deactivation that avoids complex cam or rocker arm modifications.
2Productivity
If valve bridges with multiple valves are used, then the engine efficiency improves, but the ease of operation for cylinder deactivation deteriorates
Solution Approach 1:
The valve bridge is segmented into multiple sections, each controllable by its own latch pin. This segmentation allows selective deactivation of individual cylinders while maintaining operation of others, making it easy to control multi-valve configurations without compromising engine efficiency.
Solution Approach 2:
The latch pins are designed to be dynamically engaged or disengaged based on operating conditions. This dynamic control mechanism allows the valvetrain to adapt between different operational modes (full operation vs. cylinder deactivation) easily, maintaining high engine efficiency while simplifying control.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables efficient cylinder deactivation by keeping valves closed, reducing energy consumption and improving engine efficiency through controlled valve operation using the electromagnet's magnetic field.
Implementation Method 1
an electromagnet, wherein the electromagnet is configured to move the movable shaft
Data Source
AI summary
A valvetrain assembly comprising a first body and a second body, wherein the second body comprises a first wall and a second wall. The valvetrain assembly further comprises a first latch pin, wherein the first latch pin is configured to latch the second body to the first body and unlatch the second body from the first body. A portion of the first latch pin is located between the first wall and the second wall. The valvetrain assembly also comprises a movable shaft, wherein the movable shaft is configured to move the first latch pin. The valvetrain assembly comprises an electromagnet, wherein the electromagnet is configured to move the movable shaft.