High resolution pwm wheel speed sensor protocol

By designing sensor elements and signal processing devices, and using multiple switching thresholds to generate movement pulses for encoding, the accuracy and cost issues of detecting the relative movement between the encoder and sensor elements in the prior art have been solved, achieving high-resolution and low-cost relative speed measurement.

CN115023617BActive Publication Date: 2026-01-16CONTINENTAL AUTOMOTIVE TECHNOLOGIES GMBH
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Patent Information

Application Number
CN202180011435.4
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Priority Date
2020-01-29
Filing Date
2021-01-28
Publication Date
2026-01-16
Estimated Expiration
2041-01-28

AI Technical Summary

Technical Problem

Existing technologies struggle to detect the relative movement between encoders and sensor elements with high precision and low cost, and also find it difficult to reliably measure relative speed across different speed ranges.

Method used

Design a sensor comprising at least one sensor element and a signal processing device having multiple switching thresholds for generating a relative motion signal and independently evaluating the relative velocity between the encoder and the sensor element by encoding a motion pulse having a defined duration.

Benefits of technology

It achieves high-resolution, low-cost detection of relative movement between encoder and sensor elements, and can stably and reliably measure relative speed within different speed ranges, thus improving the reliability and applicability of the sensor.

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Abstract

The invention relates to a sensor (1) for detecting a relative movement between an encoder (2) and at least one sensor element (3), the encoder having a substantially periodic scale and / or pattern, wherein the sensor (1) comprises at least one sensor element (3) and a signal processing device (4), the signal processing device (4) being designed to base a sensor element output signal (5) of the sensor element (3) on providing a movement signal (6), wherein the signal processing device (4) is designed such that the signal processing device has two or more switching thresholds for the at least one sensor element output signal (5), substantially whenever the sensor element output signal (5) exceeds and / or does not reach a switching threshold, movement information is generated which is taken into account for generating the movement signal, wherein the signal processing device (4) is designed such that the occurrence of the movement information leads to the generation of a specific movement pulse in the movement signal (6) having a defined duration, wherein the signal processing device (4) is designed to assess and / or calculate the relative speed between the encoder (1) and the sensor element (3) substantially independently and the defined duration of the movement pulse depends on the case that at least one first limit speed of the relative speed between the encoder (2) and the sensor element (3) is exceeded and / or not reached. Thus, the signal processing device can identify, for example, whether the sensor is currently operating in a high-resolution mode. In addition, the pulse length can also vary based on other state information, such as the direction of rotation or the gap size.
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Citation Information

Patent Citations

  • Vehicle control device and rotateon detection device used in same

    CN102472768A

  • Speed ​​sensor with increased resolution and multiple switching thresholds

    DE102018222791A1

  • Method and apparatus for providing information from a speed and direction sensor

    US20030141862A1