Steering-Knuckle Sensor Assembly for Active Rolling-Noise Control
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Solution Overview
Problem
Existing active noise control systems for motor vehicles require expensive and complex sensors, such as accelerometers, which are difficult to integrate into existing vehicle architectures due to space and mounting constraints, leading to inefficiencies in noise reduction.
Innovation Solution
An active noise control assembly using wheel speed sensors and accelerometers mounted on the steering knuckles, integrated with a low-latency communication bus, generates anti-noise signals via loudspeakers without additional bulk or weight, utilizing a Feedforward control method to effectively reduce rolling noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If accelerometers are installed on the steering knuckle for active noise control, then noise reduction performance is improved, but device complexity and installation difficulty increase
Solution Approach 1:
The patent reuses existing wheel speed sensors from the vehicle's trajectory control system for active noise control purposes, eliminating the need for separate accelerometers. This multi-functional use of existing sensors improves noise reduction performance while avoiding the complexity of installing additional sensing devices on the steering knuckle.
Solution Approach 2:
The existing wheel speed sensors serve dual purposes: their primary function for trajectory control and their secondary function for providing reference signals for active noise control. This self-service approach allows the system to achieve improved measurement precision without requiring additional dedicated sensors, thereby reducing installation complexity.
2Measurement precision
If additional sensors are added to the vehicle for noise control, then measurement quality is improved, but available installation space and wiring capacity are reduced
Solution Approach 1:
The patent utilizes existing wheel speed sensors that are already installed on the steering knuckle for the vehicle's trajectory control system. By repurposing these sensors for active noise control, the system achieves high-quality measurements without requiring additional installation space, as no new sensors need to be mounted on the vehicle.
Solution Approach 2:
The existing sensor infrastructure serves dual functions: providing data for both trajectory control and active noise control. This approach allows the system to obtain high-quality reference signals while avoiding the need for additional wiring and installation space that would be required for dedicated noise control sensors.
3Measurement precision
If high sampling frequency is used for accelerometer measurements, then noise control performance is improved, but data transmission requirements and processing load increase
Solution Approach 1:
The patent uses existing wheel speed sensors that naturally provide high-frequency measurement data for trajectory control. By utilizing this existing high-frequency data for active noise control, the system achieves improved noise control performance without requiring additional high-speed data transmission infrastructure or increased processing load, as the data is already being captured and transmitted by the trajectory control system.
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
Provides high-performance noise reduction with improved signal consistency and reduced latency, ensuring effective cancellation of rolling noise without the need for additional sensors or installation space, enhancing vehicle architecture compatibility.
Implementation Method 1
the solid-borne noise generated by the rolling of the motor vehicle on the road causes vibrations in the structure
Implementation Method 2
active noise control processes, producing anti-noise signals to reduce noise pollution in the vehicle cabin
Data Source
Figure 1~2
Figure 3
AI summary
Disclosed is an assembly (1) for active control of the rolling noise for a motor vehicle, comprising a path control device (2), comprising another sensor (22, 22') fastened on the steering knuckle (20, 20'), such as an accelerometer, the path control device (2) being capable of transmitting, to the anti-noise device (3), measurements obtained by the other sensor (22, 22'); the anti-noise device (3) being capable of generating an anti-noise signal depending on the acceleration measurements obtained and controlling its transmission via the loudspeaker (31).