SENSORS
Delphi Flat Response Knock Sensor
The Delphi Flat Response Knock Sensor is a self-generating
piezoelectric sensor. Commonly mounted on an engine block or
cylinder head, it produces an output voltage in proportion to the
engine vibrations caused by knock. When knock is present on the
sensor signal, the engine control module (ECM) controls knock by
retarding spark timing, or diesel injection timing.
Benefits
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Self-generating piezoelectric design requires no power to
the sensor
Flat frequency response allows the same senor to be used on
different engines and the sensor responds to knock frequencies
higher than the primary frequency
Ground-isolated design with two-wire shielded harness helps
protect the sensor signal from electro-magnetic interference
(EMI)
Large mounting hole accommodates mounting bolts up to
10 mm in diameter
Typical Applications
Delphi Flat Response Knock Sensors
(Conventional and Mini Sensor configurations
shown with integrated and pigtail connectors.)
The Delphi Flat Response Knock Sensor is designed for use on
virtually any internal combustion engine, including:
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Two stroke engines
Alternative fuel engines
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Diesel engines
Flexible fuel engines
Performance Advantages
The Delphi Flat Response Knock Sensor has a flat frequency response over a range of from 1 to 18 kHz,
thus the same sensor can be used on different engines by simply adjusting the filter frequency of the signal
processing electronics to match the knock frequency of the engine. In addition, the sensor responds to
knock frequencies higher than the primary knock frequency. This allows the higher knock frequencies to be
used by a control system, either individually or combined with the primary knock frequency.
Performance Specifications
Voltage output
Linearity
Mounting hole
Operating temperature range
Environment
Electrical connectors
Package size
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Average output 27 ± 10 mV/g over 1 to 18 kHz into a 100 K Ω resistive load
Output stays within ± 15 percent of average value at the limits of 1 to 18 kHz
Accommodates mounting bolts up to 10 mm in diameter
-40° C to 150° C
Sensor and connector are sealed to withstand humidity, salt spray, automotive
fluids and general automotive environments
Various harness lengths, alternative connectors, or connector at sensor body
can be accommodated
A: Available in sizes of 29.8 mm and 25 mm
B: Available in sizes of 24.35 mm and 20 mm
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Delphi Flat Response Knock Sensor
Typical Installation and Behavior
This chart demonstrates the range of dimensions that
can be accommodated with the Delphi Flat Response
Knock Sensor mounting bolt.
Typical Transfer Function Axial Input Only
This chart demonstrates the behavior of the
Delphi Flat Response Knock Sensor
throughout the range of frequencies from 1 to
18 kHz
The Delphi Advantage
Delphi has one of the industry's most complete portfolios of sensors. Delphi has the experience and the
expertise to provide extremely reliable, highly accurate and very cost competitive sensors for a wide range
of applications. And, Delphi can provide a single component or a multifunctional "smart" module to meet
specific customer needs.
As a global leader in engine and powertrain management systems technology, Delphi can help
manufacturers around the world meet emissions requirements, improve fuel economy and enhance
performance. Delphi is a source for high value solutions and our systems expertise is built into every
product. Delphi's flexible engineering approach encourages collaboration. And, Delphi has a thorough
understanding of automotive markets around the world and a global network of resources.
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