Camshaft Adjustment Device Hydraulic Torque Control
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Solution Overview
Problem
Existing camshaft adjustment devices face issues with oil pressure drops at low engine speeds and high temperatures, leading to excessive wear and reduced engine life, and require larger oil pumps or additional components that increase power consumption and complexity.
Innovation Solution
A hydraulic camshaft adjustment device with integrated check and control valves that allows for passive adjustment at low oil pressures and active adjustment at high pressures, using camshaft torque and oil pressure to control fluid flow between operating chambers, ensuring no oil pressure drop and compact design.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stress or pressure
If a larger oil pump is used to avoid oil pressure drop, then oil pressure stability is improved, but power consumption and fuel consumption increase
Solution Approach 1:
The camshaft adjuster uses its own varying torque during rotation to drive the hydraulic adjustment mechanism, eliminating the need for external energy input. The system self-regulates by converting mechanical torque variations into hydraulic pressure changes, adjusting camshaft phase position without consuming additional power from the engine.
Solution Approach 2:
The invention employs a hydraulic circuit where oil pressure changes driven by camshaft torque variations control the adjustment mechanism. Hydraulic fluid is used to transmit force and enable phase adjustment, leveraging fluid mechanics to achieve the desired function without mechanical direct drive or external pumps.
2Stress or pressure
If pressure stores are used to avoid oil pressure drop, then oil pressure stability is improved, but device volume increases
Solution Approach 1:
The system utilizes the inherent varying torque of the camshaft during its rotation cycle to generate the necessary pressure changes for adjustment. No external pressure storage devices are needed because the camshaft itself provides the driving force through its torque variations, eliminating additional volumetric components.
Solution Approach 2:
The camshaft serves dual functions: it both drives the engine valves and provides the torque variations needed to power the phase adjustment mechanism. This multi-functionality eliminates the need for separate pressure storage devices, reducing overall system volume while maintaining adjustment capability.
3Ease of operation
If check valve and proportional valve are added to utilize camshaft torque for adjustment, then adjustment capability is improved, but device complexity increases
Solution Approach 1:
The control valve integrates multiple functions including check valve functionality and proportional control within a single component. This merging of functions reduces the total number of separate valves and components needed, simplifying the overall device structure while maintaining the ability to utilize camshaft torque for precise adjustment.
Solution Approach 2:
The control valve is designed to perform multiple roles: it acts as a check valve to prevent backflow, a proportional valve to control adjustment speed, and a flow distribution mechanism. This multi-functionality reduces component count and device complexity while achieving comprehensive adjustment capability.
4Stress or pressure
If check valve is added to prevent oil back flow, then oil pressure stability is improved, but device complexity and manufacturing cost increase
Solution Approach 1:
The control valve incorporates check valve functionality as an integrated feature rather than a separate component. This merging allows the same valve body to perform both flow control and backflow prevention, reducing part count, simplifying assembly, and lowering manufacturing costs while maintaining oil pressure stability.
Solution Approach 2:
The control valve is designed as a multi-functional component that simultaneously provides proportional control, flow regulation, and check valve functionality. This universal design eliminates the need for separate check valves, reducing manufacturing complexity and cost while ensuring oil pressure stability during adjustment operations.
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
The solution provides optimal adjustment functions across all operating ranges without oil pressure drops, maintaining engine lubrication and reducing power consumption, while ensuring a compact and cost-effective design.
Implementation Method 1
a hydraulic system for supplying hydraulic operating fluid to the operating chambers of the camshaft adjustment device
Implementation Method 2
controlled admission to, and release thereof from, operating chambers of the adjustment device
Implementation Method 3
Novel camshaft adjuster includes a hydraulic circuit via which the actuation of the angular adjustment occurs passively by a camshaft torque changing over a shaft rotation one or several times
Implementation Method 4
the actuation of the angular adjustment occurs passively by a camshaft torque changing over a shaft rotation
Implementation Method 5
These adjusters require as additional design component a check valve which is arranged in the oil supply path ahead of a proportional valve which is needed for the control. By this check valve, a back flow of oil into the engine oil circuit caused by the counteraction of the camshaft torque against the desired adjustment direction is prevented
Data Source
AI summary
In an adjustment device for adjusting the phase position of a camshaft relative to a crankshaft of an internal combustion engine which includes a hydraulic system for supplying hydraulic fluid under pressure to the adjustment device for the controlled admission to, and release thereof from, operating chambers of the adjustment device under the control of a control device including a control valve, the operating chambers are in communication with one another via control valves to permit flow of hydraulic fluid from one set of operating chambers to another by the varying torques effective on the camshaft or by controlling fluid supply to the operating chambers from the hydraulic fluid supply system.