Oxygen sensor feedback loop digital electronic signal integrator for internal combustion engine control

Patent · Tue Jun 30 04:00:00 EDT 1981

OSTI ID:6077376

Hartford, T W; Kessler, J A

A method and apparatus for controlling the various functions of an internal combustion engine are disclosed that uses a program-controlled microprocessor having a memory preprogrammed with various control laws and associated control schedules receives information concerning one or more engine-operating parameters such as manifold pressure, throttle position, engine coolant temperature, air temperature, and engine speed or period and the like. These parameters are sensed or measured and then the value thereof is supplied to input circuits for signal conditioning and conversion to digital words usable by the microprocessor. The microprocessor system computes digital control words indicative of particular computer-commanded engine control operations and output circuitry responds to predetermined computer-generated commands and to the computed digital command words for converting them into corresponding pulse-width control signals for controlling such engine operations as fuel-injection, ignition timing, proportional and/or on-off egr control, and the like. The engine control system further includes an oxygen sensor feedback system for providing reliable data to said microprocessor for command control purposes. In particular the oxygen sensor signal is sampled a predetermined number of times per each engine revolution and the totality of each sampling is determined per revolution. This generates a digital word representing the condition of the air/fuel ratio of the engine over each revolution.

• Assignee: Bendix Corp The
• Patent Number(s): US 4276600
• OSTI ID: 6077376
• Country of Publication: United States
• Language: English

Related Subjects

33 ADVANCED PROPULSION SYSTEMS
330100* -- Internal Combustion Engines
COMPUTERIZED CONTROL SYSTEMS
COMPUTERS
CONTROL SYSTEMS
DIGITAL COMPUTERS
ELECTRONIC CIRCUITS
ELECTRONIC EQUIPMENT
ENGINES
ENRICHMENT
EQUIPMENT
EXHAUST GASES
FEEDBACK
FLUIDS
FUEL-AIR RATIO
GASEOUS WASTES
GASES
HEAT ENGINES
INTERNAL COMBUSTION ENGINES
MEASURING INSTRUMENTS
METERS
MICROELECTRONIC CIRCUITS
MICROPROCESSORS
OXYGEN ENRICHMENT
OXYGEN METERS
WASTES