Rotation Sensor Pulse Segmentation for Initialization Delay
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing rotation sensors face challenges in accurately determining the rotational state and direction of a rotational member during initializing and vibration determining periods, leading to delayed information output, which is critical for applications like ABS systems and hybrid vehicle control devices.
Innovation Solution
A rotation sensor with a detecting portion, a rotational state determining portion, and a pulse generating portion that outputs distinct pulses based on the rotational direction and state, including a third pulse regardless of the rotational state, ensuring continuous information delivery even during initializing and vibration determining periods.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the rotation sensor masks the output during initializing period and adjustment period to determine rotational state and direction, then the measurement precision and reliability are improved, but the information output is delayed and the responsiveness to control devices deteriorates
Solution Approach 1:
The output pulses are segmented into multiple types (first pulse, second pulse, third pulse) with different waveforms. The third pulse is generated regardless of rotational state during predetermined periods, while first and second pulses are generated only when rotational direction is determined. This segmentation allows simultaneous provision of continuous timing information and accurate rotational state information.
Solution Approach 2:
The pulse generating portion serves multiple functions: it provides continuous pulse output for timing information (third pulse) and conditional pulse output for rotational direction information (first and second pulses). This multi-functionality resolves the contradiction by making the single pulse generating component serve both responsiveness and precision requirements.
2Reliability
If the rotation sensor sets adjustment period when rotational directions are switched or rotational member temporarily stops, then the reliability of rotational direction determination is improved, but the duration of action increases and continuous rotation detection is delayed
Solution Approach 1:
The pulse generating portion operates periodically with different pulse types. During adjustment periods, it continues generating third pulses at regular intervals, maintaining periodic output. When rotational direction is determined, it switches to generating first or second pulses. This periodic action ensures continuous information flow while accommodating reliability-adjustment periods.
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 rapid and accurate output of rotational information, including speed and direction, during all operational phases, enhancing the responsiveness of control devices in applications like ABS systems and hybrid vehicles.
Implementation Method 1
The detecting element is structured with a Hall element, a magnetic resistance element, or the like
Data Source
AI summary
A rotation sensor includes a detecting portion, a rotational state determining portion and a pulse generating portion. The detecting portion detects a rotation of a rotational member and outputs a detection signal. The rotational state determining portion determines a rotational state of the rotational member on the basis of the detection signal in a predetermined period. The pulse generating portion generates and outputs a first pulse and a second pulse, of which waveforms differ from each other, in response to a rotational direction of the rotational member after the predetermined period. The pulse generating portion further generates and outputs a third pulse regardless of the rotational state of the rotational member in the predetermined period.