Variable Displacement Solenoid Control for Faster Cylinder Deactivation
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Solution Overview
Problem
Cam profile switching systems in variable displacement engines face limitations in operating range at higher engine speeds due to the inability to robustly switch cylinder deactivation devices within one engine cycle, and faster switching capabilities often increase costs and decrease fuel efficiency.
Innovation Solution
The method involves adjusting an electromechanical actuator to operate at specific levels to achieve faster switching between valve transitions, including a first level without transition, a second level without transition in response to increased potential for transition, and a third level inducing a valve transition, allowing for expedited switching between VDE and non-VDE modes by varying the duty cycle and current of the CPS system control signal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If a cylinder deactivation device with faster switching capabilities is used, then switching speed is improved, but device cost increases and fuel efficiency decreases
Solution Approach 1:
The solenoid actuator is dynamically controlled through multi-level actuation (first level for normal operation, second level for pre-transition, third level for forced transition) based on real-time engine operating conditions. This dynamic control enables faster switching without requiring a physically larger or more expensive solenoid device, as the switching speed is achieved through intelligent control rather than hardware upgrades.
Solution Approach 2:
The control signal parameters (current levels, duty cycle) are varied to optimize solenoid switching performance. By changing the actuation parameters dynamically - using higher current levels for faster switching when needed and lower levels for normal operation - the system achieves fast switching capabilities without increasing the fundamental device size or cost.
2Device complexity
If conventional solenoid switching is used at higher engine speeds, then device simplicity is maintained, but switching reliability deteriorates
Solution Approach 1:
The control system continuously monitors engine operating conditions (speed, load, temperature) and adjusts solenoid actuation levels accordingly. This feedback mechanism ensures reliable switching at higher engine speeds by adapting the control strategy to real-time conditions, maintaining both simplicity and reliability through intelligent decision-making rather than complex hardware.
Solution Approach 2:
The system performs preliminary actions by transitioning to intermediate actuation levels before final switching occurs. When a valve transition is detected or anticipated, the control system activates intermediate levels (second level) to prepare the solenoid for rapid transition, ensuring reliable switching timing without requiring overly complex control mechanisms.
3Loss of energy
If cylinder deactivation is implemented, then fuel efficiency is improved, but switching speed deteriorates
Solution Approach 1:
The system dynamically adjusts solenoid actuation based on engine operating conditions. During steady-state operation, normal actuation levels are used to maintain fuel efficiency through cylinder deactivation. When rapid switching is required (detected through engine condition monitoring), the system transitions to higher actuation levels, enabling fast valve transition while maintaining the fuel efficiency benefits of cylinder deactivation.
Solution Approach 2:
The control parameters are optimized to balance fuel efficiency and switching speed. By varying current levels and duty cycle parameters dynamically, the system can operate in fuel-efficient mode during stable conditions and switch to high-speed mode when needed, achieving both fuel efficiency improvement and adequate switching speed without compromise.
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
This approach enables faster and more efficient switching between engine operating modes, improving fuel efficiency and reducing costs by optimizing solenoid switching without the need for larger, more expensive cylinder deactivation devices.
Implementation Method 1
adjusting an electromechanical actuator to actuate a cylinder valve adjustment mechanism
Data Source
AI summary
Methods are provided for improved control of valve activation/deactivation mechanisms. One example method comprises, adjusting an electromechanical actuator to actuate cylinder valve deactivation/activation mechanisms. The actuator is operated at multiple levels based on engine operating conditions.