Centrifugal Pendulum Damping Control for Cold-Start Drivetrains
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Solution Overview
Problem
Existing drivetrain systems face challenges in achieving quiet and efficient operation, particularly at low temperatures where the centrifugal pendulum's damping medium's reduced effectiveness leads to unwanted noise and increased fuel consumption, and temperature measurement using sensors is costly and impractical.
Innovation Solution
A method and drivetrain design that calculates the temperature of the damping medium using a mathematical model, eliminating the need for temperature sensors and allowing adaptive operation to minimize noise and energy consumption by adjusting load and rotational speed based on calculated temperatures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If temperature sensors are used to measure the damping medium temperature, then temperature measurement precision is improved, but device complexity and cost increase
Solution Approach 1:
The patent replaces the mechanical/physical temperature sensor system with a mathematical model-based calculation system. The control unit calculates the damping medium temperature based on measured operating parameters (rotational speed, load) and a pre-stored mathematical model, eliminating the need for direct temperature sensing hardware.
Solution Approach 2:
The system uses its own operating parameters (rotational speed, load) to indirectly determine the temperature state of the damping medium. The drivetrain components themselves provide the data needed to infer the temperature condition without requiring separate measurement devices.
2Productivity
If the drivetrain operates at high rotational speed to maintain efficiency, then productivity is improved, but noise increases at low temperatures due to insufficient damping
Solution Approach 1:
The control unit continuously monitors operating parameters, calculates the damping medium temperature in real-time, and adjusts the rotational speed accordingly. This closed-loop feedback system ensures that when the damping medium is cold and less effective, the rotational speed is reduced to prevent noise, and when the damping medium is warm and effective, the rotational speed can be increased for optimal efficiency.
Solution Approach 2:
The patent implements dynamic adjustment of the rotational speed based on the calculated temperature state of the damping medium. Rather than operating at a fixed high speed, the system adaptively modifies its operating characteristics to match the current damping effectiveness, optimizing both noise reduction and efficiency.
3Use of energy by moving object
If the drivetrain operates at high load to reduce fuel consumption, then use of energy is improved, but noise increases when damping medium temperature is low
Solution Approach 1:
The control unit uses feedback from load sensors and temperature calculations to dynamically adjust the operating load. When the damping medium temperature is low, the system reduces the load to prevent noise generation, and when the temperature is adequate, it increases the load to minimize fuel consumption, achieving optimal energy efficiency at all times.
4Productivity
If rotational speed is increased to improve productivity, then productivity is improved, but the damping medium becomes less effective at low temperatures leading to increased noise
Solution Approach 1:
The patent implements dynamic rotational speed adjustment based on real-time calculation of damping medium temperature. The system continuously adapts the rotational speed to match the current damping effectiveness, ensuring optimal productivity when conditions permit and noise reduction when the damping medium is cold and less effective.
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 precise, cost-effective temperature determination and adaptive operation, reducing noise and fuel consumption by maintaining optimal drivetrain conditions, especially at low temperatures, while maintaining a comfortable and energy-efficient running state.
Implementation Method 1
at least one damping medium by means of which relative movements, especially relative rotations, are hydraulically dampened between the primary part and the secondary part
Implementation Method 2
torsional vibrations of at least one component of the drivetrain, designed for example as a shaft
Data Source
AI summary
A method for operating a drivetrain of a motor vehicle having at least one centrifugal pendulum, in which the centrifugal pendulum comprises at least one primary part rotatable about an axis of rotation, at least one secondary part movable relative to the primary part, and at least one damping medium by which relative movements are hydraulically dampened between the primary part and the secondary part, wherein at least one temperature of the damping medium is calculated by an electronic calculating device of the drivetrain with the aid of a mathematical model.