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Download How to Tune and Modify Automotive Engine Management Systems by Jeff Hartman PDF

By Jeff Hartman

Figuring out gas injection and engine administration platforms is the foremost to extracting better functionality from today’s cars in a secure, trustworthy, and driveable fashion.

Turbochargers, superchargers, nitrous oxide, excessive compression ratios, radical camshafts: all are recognized to make horsepower, yet with out right realizing and regulate of gasoline injection and different digital engine administration platforms, those renowned power-adders won't ever reside as much as their power and, at worst, may cause dear engine damage.

Drawing on a wealth of data and event and a history of greater than 1,000 journal articles at the topic, engine-control professional Jeff Hartman explains every thing from the fundamentals of gas injection to the construction of advanced undertaking autos. Hartman covers the most recent advancements in fuel-injection and engine administration know-how utilized by way of either overseas and family brands, together with renowned aftermarket systems.

No different booklet available in the market covers the topic of engine administration structures from as many angles and as comprehensively as this book.

Through his non-stop journal writing, writer Jeff Hartman is usually updated with the latest fuel-injection and engine administration items and platforms.

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But Hall effect sensors are based on a phenomenon discovered in 1879 by the American scientist Edwin H. Hall. Hall discovered that when an electric current was applied to metal inserted between two magnets, it created a secondary voltage in the metal at a right angle to the applied voltage. In a modern Hall effect sensor, the voltage change occurs in a silicon chip placed at a right angle to a magnetic field. When a magnet moves into close proximity of the Hall effect sensor (or when a moving metal shutter blade uncovers a magnet located near the sensor), the sensor’s output voltage suddenly jumps to full scale.

A carburetor approximates this sort of VE-based air/fuel adjustment by sizing the main jet for primary regulation of fuel delivery to the venturi, trimming this fuel flow with air corrector jets and emulsion tubes of precise size to progressively dilute the main jet fuel stream with air in order to limit fuel flow as engine speed and loading increase (fuel flow otherwise increases faster than airflow). A power valve in the carburetor opens under highmanifold pressure (high VE) to allow additional fuel to bypass the main jet and flow directly to the venturi in higher volume.

As well, ion sensing is one of the cheapest and simplest methods for monitoring the combustion event in a spark-ignited engine, and models exist that connect the ionization current to cylinder pressure and temperature. Ion sensors show great promise for engine management. Let’s take a slightly harder look at the context of what is involved in the job of an engine management microcomputer. In particular, air/fuel ratio. 7 pounds of air to 1 pound of fuel, the ideal ratio for perfect combustion. Under the right conditions, this mixture will combust to release all chemical energy stored in the fuel, leaving no unused oxygen and no unburned hydrocarbons.

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