Browse Prior Art Database

Microprocessor Engine Controller

IP.com Disclosure Number: IPCOM000061882D
Original Publication Date: 1986-Jul-01
Included in the Prior Art Database: 2005-Mar-09
Document File: 1 page(s) / 12K

Publishing Venue

IBM

Related People

Martin, DB: AUTHOR

Abstract

A microprocessor 10 receives data from an engine crank sensor 12 and knock sensors 14 to control and coordinate the ignition and fuel distribution systems of a multi-cylinder gasoline engine.

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Microprocessor Engine Controller

A microprocessor 10 receives data from an engine crank sensor 12 and knock sensors 14 to control and coordinate the ignition and fuel distribution systems of a multi-cylinder gasoline engine.

In a six cylinder engine, the crank position sensor 12 includes magnetic sensors mounted around the harmonic damper at 12, 4 and 8 o'clock to sense a notch cut on the periphery of the disk-shaped damper. As the damper rotates, the reluctance of each sensor undergoes an abrupt change each time the notch passes the sensor to generate the position information.

A knock sensor 14 is used for each cylinder or the knock sensors can be shared by groups of two or three cylinders. When knock sensors are shared, the microprocessor 10 is used to compare knock sensor signals with engine position sensor signals to determine which cylinder of a group is knocking.

Multiple spark coils 16 are used, each one dedicated to firing a pair of companion cylinders. One coil fires cylinders 1 and 6, another fires cylinders 2 and 5, and a third fires cy linders 3 and 4. Each coil delivers a spark to its cylinder pair simultaneously. Whichever cylinder of the pair is in its compression stroke fires. The companion cylinder is on its exh stroke so the spark it receives is a "waste spark". The microprocessor 10 receives the position and knock data from the sensors 12 and 14, respectively, and adjusts the spark to each cylinder individually to obtain maximum performance.

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