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Optical

Optical-sensing technology measures absolute angular position over 360 degrees using a photoelectric device; multi-turn is achieved using internal software. Methode also uses an optical encoder concept that can detect incremental rotation of a shaft at high speeds. This can also be used for steer-by-wire applications.

 


Customer Values

  • Maintenance-free performance for the design life of the product
  • Flexible concept applicable to most steering sensing applications

Technology Values

  • Precision sensor capable of angular measurement with high accuracy
  • Zero hysteresis through direct detection of the code disc/shaft
  • Capable of angular error detection
  • Low angular error
  • Up to 1,800 rpm with accuracy of ±0.5°
  • LED receiver/transmitter approach

Technology Fundamentals

At the heart of optical sensing is an opto-electrical reader. The CMOS sensor is restricted to a single row rather than a matrix. The sensor array is exposed to light through a code disc with apertures of varying sizes determined by a unique code. The aperture sizes determine a value that—when compared to a look-up table—defines angle within one revolution of 360 degrees. In our application, the sensor software detects errors very quickly and reliably. Methode's optical encoder can incrementally detect the rotation of a shaft for speeds up to 1,800 rpm with an accuracy of ±0.5 degrees. The system consists of a stationary housing containing the sensor and optical components, and a disc that attaches to the rotating shaft. Methode's system is designed to be insensitive to the axial position of the disc, while still being sensitive to radial movement.

Products & Capabilities

Optical Steering Angle Sensor

Customer Values

  • Developed technology portable to new customer applications
  • Designed and validated to perform in harsh automotive environments
Technology Values
  • Precision sensor capable of angular measurement with high accuracy
  • Absolute angle known from start-up

Steering Angle Sensor

Customer Values

  • Maintenance-free performance for the design life of the product
  • Compact sensor size: 20mm. height in axial direction (outer and inner diameter to match application requirements)
Technology Values
  • Up to 1,800 RPM with Accuracy of ±0.5° (no hysteresis)
  • Low sensitivity to system tolerances: up to ±2mm axial disc position
  • Applicable for some steer-by-wire applications

Technical Library

Steering Angle Sensor Data Sheet

[PDF 1.53 MB]

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