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Engine Knock Sensing Applications
(HIP9011EVAL1Z)
Application Note
November 6, 2006
AN9770.1
HIP9011EVAL1Z Evaluation Board
There continues a driving effort by the Government and the
automotive industry to make cars more efficient with lower
emissions. Tighter and more extensive control of automobile
engines by microcontrollers has resulted in significant strides
towards these goals.
One of the factors contributing to these improvements is
engine ignition control. The HIP9011 helps in the ongoing
battle to enhance engine performance by providing more
detailed information to the engine microcontroller.
An important point to remember - automotive engines operate
most efficiently when the engine is placed in the ignition timing
condition just prior to ping or pre-ignition. The closer an
engine can operate to this condition, the higher the
performance. This is analogous to an operational amplifier,
where the higher the gain, the lower the distortion. In the case
of the knock signal processing IC, it provides a means of
detecting engine knock or ping at levels that were previously
unrealizable by amplification and filter means. Figure 1 shows
the HIP9011 in a typical engine application.
ENGINE CONTROL MODULE
MOSI
CS
HIP9011
MOSI ? SO
SCK
INTOUT
INT/ HOLD
A/D
CONVERTER
SPI
INTERFACE
KNOCK
KNOCK
SENSOR
HOST
MICROCONTROLLER
SENSOR
OTHER ENGINE
SENSOR SIGNALS
ENGINE CONTROL SIGNALS
FIGURE 1. HIP9011 IN A TYPICAL ENGINE CONTROL APPLICATION
1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
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Copyright Intersil Americas Inc. 1999, 2006. All Rights Reserved
All other trademarks mentioned are the property of their respective owners.
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