Input/output electronic for microprocessor-based engine control system

Patent · Tue Dec 30 04:00:00 EST 1980

OSTI ID:6574054

Hartford, T W

A method and apparatus for controlling the various functions of an internal combustion engine using a program controlled microprocessor having a memory preprogrammed with various control laws and associated control schedules receives information relating to one or more actual engine operating parameters such as manifold absolute pressure, throttle position, engine coolant temperature, air temperature, engine speed or period or the like. These parameters are sensed and then supplied to input circuits for signal conditioning and conversion to digital words usable by the microprocessor. The microprocessor system computes one or more digital 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 generating 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. A fuel management control ''limp home'' circuit is also disclosed which will allow a vehicle to be driven for a short distance such as to a repair station or the like whenever the microprocessor-controlled fuel injection system fails to function properly.

• Assignee: Bendix Corp The
• Patent Number(s): US 4242728
• OSTI ID: 6574054
• Country of Publication: United States
• Language: English

Related Subjects

33 ADVANCED PROPULSION SYSTEMS
330100* -- Internal Combustion Engines
COMPUTERIZED CONTROL SYSTEMS
COMPUTERS
CONTROL SYSTEMS
ELECTRONIC CIRCUITS
ENGINES
EQUIPMENT
EXHAUST RECIRCULATION SYSTEMS
EXHAUST SYSTEMS
FUEL INJECTION SYSTEMS
FUEL SYSTEMS
HEAT ENGINES
INTERNAL COMBUSTION ENGINES
MICROELECTRONIC CIRCUITS
MICROPROCESSORS
POLLUTION CONTROL EQUIPMENT