Camshaft Actuator Torque Compensation Control
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Solution Overview
Problem
Modern internal combustion engines face challenges in precisely adjusting the camshaft position due to lag times and delayed responses in actuator elements, leading to control errors and instability, especially with changing operating conditions such as oil pressure and variable camshaft geometries.
Innovation Solution
A method is introduced to determine and counteract torques transmitted from engine components to the camshaft, using a vane cell adjuster with hydraulic fluid control, to maintain a stable camshaft setting by adjusting the mass flow of hydraulic fluid based on operating parameters, thereby preventing unwanted adjustments and drift.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the camshaft position is repeatedly re-adjusted during operation using an actuator element, then the desired camshaft setting can be held, but lag times and delayed response occur leading to control errors and instability
Solution Approach 1:
The controller determines torques from operating parameters in advance and uses these predetermined torque values to proactively counteract disturbances before they cause camshaft position drift. This preliminary calculation and preparation of counteracting torques allows the system to respond more quickly without waiting for position deviations to occur.
Solution Approach 2:
The adjuster dynamically adapts its control behavior by continuously adjusting the mass flow of hydraulic fluid based on determined torques and actual camshaft position. The system transitions from static control to dynamic control where the control parameters change in real-time according to operating conditions, enabling faster response to disturbances.
2Measurement precision
If the actuator element is controlled with repeated engagement to reach setpoint setting, then the desired position can be achieved, but a quasi-steady-state is set instead and drift occurs
Solution Approach 1:
The controller continuously determines the actual camshaft position and compares it with the desired position. Based on this feedback and the determined torques from operating parameters, the controller actively adjusts the adjuster to counteract any drift. This closed-loop feedback mechanism with torque compensation prevents the quasi-steady-state problem by continuously correcting position deviations.
Solution Approach 2:
The controller determines torques that counteract disturbances before they can cause significant position drift. By calculating and applying counteracting torques based on operating parameters in advance, the system prevents drift from occurring rather than merely reacting to it after position errors have developed.
3Reliability
If a load-dependent and rotational-speed-dependent characteristic diagram is used to compensate drift, then the camshaft position can be maintained, but the system complexity increases
Solution Approach 1:
The patent replaces complex mechanical control systems with a controller that determines torques from operating parameters and uses these torque values to control the adjuster. This substitution of mechanical characteristic diagrams with a torque-based control algorithm simplifies the system while maintaining or improving control quality, as the torque determination can be performed computationally without complex mechanical components.
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 enhances the control quality of the actuator element, improving ignition behavior, emissions, and fuel consumption by maintaining the desired camshaft setting, reducing control errors and drift, and adapting to changing operating conditions.
Implementation Method 1
The adjuster (300) is controlled in a manner such that the torque is counteracted and the adjustment (202) of the actuator element (200) and of the camshaft setting is prohibited
Implementation Method 2
determining a torque which transmits a component of the internal combustion engine to the camshaft (201) and controlling an adjuster (300) of the actuator element (200) on the basis of the torque in such a way that the torque is counteracted
Data Source
AI summary
The present disclosure relates to internal combustion engines. Various embodiments of the teachings may include a method for adjusting an actuator element for a camshaft of an internal combustion engine, wherein the actuator element is coupled to the camshaft to adjust a camshaft setting. The method may include determining a torque imposed by a component of the engine, based on an operating parameter and controlling an adjuster of the actuator to counteract the determined torque and resist adjustment of the actuator element and the camshaft setting. Without controlling the adjuster, the torque is transmitted from the camshaft to the actuator element and can bring about an adjustment of the actuator element and of the camshaft setting. The magnitude of the adjustment corresponds to the torque imposed by the component.