Sensors

Delphi Digital Speed and Position Sensors are based on integrated adaptive threshold Hall effect technology.  They sense the speed and position of a target created with various sense features that are machined, stamped, drawn, or magnetically encoded.  They can sense speeds as low as zero RPM.

Delphi offers some Digital Speed and Position Sensors with valid-power-on elements that provide zero speed capability instantly without requiring target movement.  Most of Delphi's Digital Speed and Position Sensors employ adaptive threshold sensing schemes that improve sensor performance and reduce the sensitivity of the sensor mounting location relative to the target.

Delphi's Digital Speed and Position Sensors are available in low (wheel and transmission speed), medium (crankshaft position and speed), and high (crankshaft position and speed) switch point accuracy models.  Square wave outputs with either slightly less than supply voltage, or a regulated five volts are available.  All can be packaged to meet individual customer requirements.

Benefits

• Open collector output allows flexible controller design.
• Accurate square wave output eliminates square-up function in the controller.
• Transient protection helps protect against stray electro-magnetic fields and power line spikes.
• Various mounting applications provide choice of many existing designs, or custom designs.
• High speed electronics deliver increased edge detection.
• Externally programmed magnetic circuit provides improved timing accuracy, optimized sensor air gap and tilt, and zero speed sensing capability.
• Single element option offers simplified design, low cost, higher operating air gap, good performance for various target designs, and Valid Power on State (VPOS).
• Dual element option offers extremely accurate gear edge detection, peak detector circuitry that is immune to tilt or off-center failure mode, and gain-adjust circuitry that reduces the effect of minor gear anomalies.
• Flexible packaging provides rapid application optimization.
• Enhanced sensing capability helps reduce emissions and improve reliability and drivability

Typical Applications

Delphi Digital Speed and Position Sensors are designed for use with virtually any automotive control module that will accept a digital input.  Typical automotive applications include:

• Engine (cam and crank: speed and position),
• Transmission (input and output speed),
• Wheel (anti-locking brake systems, traction control, and vehicle stability control).
  Because they are designed for demanding applications, Delphi Digital Speed and Position Sensors are also well suited for a wide range of non-automotive product applications.
  
  

Performance Advantages

Delphi Speed and Position Sensors feature silicon Hall sense elements.  They utilize an adaptive threshold control scheme providing robust performance that improves the air gap capability and reduces the placement accuracy requirements between the sensor and the target.

The voltage supply and output signal capabilities of Delphi Digital Speed and Position Sensors are independent of the sense element.  Some feature an open collector output that allows either internal or external pull-up, while others have a high state output equivalent to the sensor’s internally regulated five volt supply.  Both output configurations provide design flexibility for the controller manufacturer.  Delphi also offers designs that help protect the sensor from transients and from electromagnetic interference (EMI).   Power can be provided by either battery or regulated voltage supplies, enabling even more controller flexibility.  Delphi’s Digital Speed and Position Sensors can operate on conditioned voltage from 4.5 to 16 volts.

This illustration demonstrates the voltage change as a consequence of a variation on the magnetic field applied.  This variation is due to a transition of a sense target from tooth to slot—or slot to tooth.
Key: Basic Function: E = I (kuB)

Performance Specifications

Delphi offers a wide range of Digital Speed and Position Sensors to meet a variety of customer requirements.

The Delphi Advantage

Delphi has one of the industry’s most complete portfolios of sensors and a thorough understanding of automotive systems integration.  Delphi offers global manufacturing capabilities for sensors and an in-depth knowledge of regional market requirements.  Delphi has the experience and the expertise to provide a single device or a multifunctional “smart” module to meet specific customer needs.