Drive Unit Mount Displacement Feedback for NVH Torque Control
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Solution Overview
Problem
Existing vehicle systems fail to effectively manage noise, vibration, and harshness (NVH) by monitoring and controlling the displacement of bushings used with drive units, leading to excessive force application and potential wear or fatigue.
Innovation Solution
A vehicle management system that includes measuring devices to monitor bushing displacement, providing torque control logic to limit propulsion and reduce displacement, thereby reducing NVH and extending bushing lifespan through an analytical model that adjusts torque output based on displacement data and bushing characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the drive unit provides full propulsion torque, then vehicle power and acceleration performance are improved, but the bushing displacement increases causing excessive noise and vibration
Solution Approach 1:
The system continuously monitors bushing displacement using a measuring device and feeds this information back to the torque control. The torque control adjusts the drive unit torque output based on the measured displacement, creating a closed-loop control system that maintains bushing displacement within acceptable limits while optimizing vehicle performance
Solution Approach 2:
The system dynamically adjusts the torque output of the drive unit based on real-time bushing displacement conditions. Rather than using a fixed torque limit, the torque control modifies the torque command continuously according to the measured displacement, allowing optimal performance across varying operating conditions
2Power
If high torque is applied to the bushing, then drive unit performance is improved, but the bushing experiences excessive force leading to wear and fatigue
Solution Approach 1:
The measuring device provides continuous feedback on bushing displacement, enabling the torque control to detect when displacement approaches limits that could cause wear or fatigue. The system responds by reducing torque output before damage occurs, protecting the bushing while maintaining performance when conditions allow
Solution Approach 2:
The system takes preliminary protective action by monitoring bushing displacement and preemptively reducing torque output before excessive force can cause wear or fatigue. The analytical model predicts potential damage and triggers torque reduction in advance, preventing rather than reacting to damage
3Duration of action of stationary object
If the system continuously monitors and adjusts torque based on bushing displacement, then bushing lifespan is extended, but system complexity increases
Solution Approach 1:
The system implements feedback control by continuously measuring bushing displacement and adjusting torque output accordingly. This closed-loop approach extends bushing lifespan by preventing excessive displacement while managing system complexity through integrated control logic that automatically processes measurement data and generates appropriate torque commands
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 system effectively reduces NVH and extends bushing lifespan by limiting displacement and adjusting torque output, using an analytical model to predict durability and fatigue, thus improving vehicle performance.
Implementation Method 1
The measuring device may include a strain gauge
Implementation Method 2
The measuring device may include a coil coupled to the bushing, and a magnet. Further, relative movement between the coil and the magnet may induce an electrical current in the coil
Data Source
AI summary
A vehicle management system includes a torque control generates torque logic for managing torque output of a drive unit and limiting displacement of a bushing that couples the drive unit to a vehicle. A measuring device monitors the bushing to measuring displacement of the bushing while the drive unit is operating. The measuring device can provide data (e.g., displacement data), indicating displacement of the bushing, to the vehicle management system. Based on a comparison between the displacement of the bushing and a threshold displacement, the torque output generates the torque logic used to manage the torque output of the drive unit.