Dual-Surface Wheel Speed Sensor for Redundant ABS Detection
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Solution Overview
Problem
Conventional wheel rotational-speed sensors for vehicles are expensive and difficult to install with redundant systems, as they require two mounting positions per wheel and precise alignment to ensure reliable operation of safety systems like ABS and ESP, especially in highly automated driving scenarios.
Innovation Solution
A compact wheel rotational-speed sensor design featuring two electrically separate sensor elements on a conductor carrier, each capable of detecting physical measurement variables using an alternating magnetic field from an encoder wheel, allowing for redundant functionality without significant space increase, enabling efficient detection and transmission of wheel rotational speed data.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If two separate wheel rotational-speed sensors are provided for redundant measurement, then safety reliability is improved, but device complexity and installation difficulty increase
Solution Approach 1:
The patent combines two wheel rotational-speed sensor elements into a single sensor unit with a common housing and shared mounting interface. The sensor housing contains both first and second sensor elements that can be positioned at different locations, allowing redundant measurement functionality while maintaining a single integrated device structure that reduces complexity compared to two separate sensors.
Solution Approach 2:
The single wheel rotational-speed sensor is designed to perform multiple functions: it can measure rotational speed at one location using the first sensor element, or at another location using the second sensor element. The common mounting interface and housing structure enable this multi-functional capability, allowing the same device to serve as either primary or redundant sensor depending on installation configuration.
2Reliability
If two mounting positions are provided on the wheel for redundant sensors, then reliability is improved, but ease of manufacture deteriorates due to lack of suitable installation locations
Solution Approach 1:
The patent utilizes the third dimension (depth/thickness) of the wheel structure by positioning sensor elements at different radial distances from the wheel center. The first sensor element can be mounted at a first radial distance and the second sensor element at a second radial distance, allowing both sensors to be accommodated within the wheel's thickness rather than requiring two separate lateral mounting positions on the wheel surface.
3Measurement precision
If both sensors are positioned correctly and identically with respect to the encoder wheel, then measurement precision is improved, but ease of operation deteriorates due to difficult mounting
Solution Approach 1:
The sensor housing incorporates a common mounting interface with alignment features that automatically ensure correct positioning of both sensor elements relative to the encoder wheel during installation. The housing structure itself performs the alignment function, eliminating the need for complex manual adjustment procedures while ensuring that both sensor elements are positioned identically and correctly with respect to the encoder wheel.
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 a cost-effective and space-efficient redundant wheel rotational-speed sensor system that meets safety requirements for autonomous driving, ensuring reliable operation by allowing easy installation and precise measurement with minimal additional space requirements.
Implementation Method 1
a first wheel rotational-speed sensor element for detecting first physical measurement variables is arranged on the first surface of the conductor carrier, and a second wheel rotational-speed sensor element for detecting second physical measurement variables is arranged on the second surface of the conductor carrier
Data Source
AI summary
A wheel rotational-speed sensor for mounting on a vehicle axle, having a sensor housing and a conductor carrier, for example a leadframe, which is arranged in the sensor housing, having a first surface and a second surface facing away from the first surface, wherein a first wheel rotational-speed sensor element for detecting first physical measurement variables is arranged on the first surface of the conductor carrier, and wherein a second wheel rotational-speed sensor element for detecting second physical measurement variables is arranged on the second surface of the conductor carrier. Specifically, the two sensor elements can detect magnetic fields of a magnetic reading track. The sensors can be AMR, GMR or TMR sensors or Hall elements; the two sensors can be structurally identical or of different design.