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Knock Signal Conditioning Using the Discrete Fourier Transform and Variable Detection Window Length (.pdf)
in the. to the engine control unit). combustion chamber cause a secondary explosion. The. pressure waves created by the explosions collide,. Knock Sensor. causing a rapid spike in both pressure and heat [2]. The. early stages of detonation cause a distinctive "ping" as. Most knock sensors today are piezoelectric
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New Roles For Ceramic Parts
nozzle. The insert has higher density and strength, and lower porosity than the surrounding material. This improves dimensional stability and resistance to erosion and corrosion. These automotive knock sensors contain a small piezo element which, when combined with an FET-amplifier, helps adjust timing
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of OhioState's Powertrain Control and Diagnostics Laboratory. Millions of cars on the road today contain vibration sensors (usually located on the engine block) that are supposed to detect engine knock. But the software that processes the signals from these sensors often confuses knock with normally occurring
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Agilent: Automotive Electronic Functional Test Using Agilent System Components
, Variable Reluctance Sensors or other isolated AC voltages must be generated. These signals are low frequency, just like the Cam/Crank/TDC/Knock signals required by engine/ powertrain control modules. Body and ABS modules can require the driving of some high current loads, while Engine Control
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Tiny micros open new frontiers
position, direct fuel injection, oxygen sensors, knock sensors, and other features can be added to increase engine efficiency at little additional cost. Also, because the throttle has a communication bus, other sensors and actuators can be added that communicate with each other and the ECM
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Another commencement address nobody asked me to give
. Never mind that after six years as tenured professors, they can knock off a year at half pay for something called a sabbatical. And if they don't like half pay, they can shorten the sabbatical to a half year and get full pay. Never mind that their offspring can attend Harvard free of charge. We might
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2.05: Supercharged with Silicon!
performance cars. Cars like Corvettes and Camaros, he says, are calibrated close to the edge at full throttle. Their designers control detonation problems with piezoelectric knock sensors, which hear the onset of detonation, then instruct the computer to retard the ignition. The new Corvette LT1 engine
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Microcontroller muscle
in parallel using SIMD instructions, it can execute multiply-and-accumulate, fractional, and bit-reversed addressing. Using the SPU opens the door to newer, more powerful algorithms. For example, a knock and misfire algorithm can be implemented as a 256-point complex 32-bit FFT, using 5,000 clock