Engine air/fuel ratio sensing device

Patent · Tue Nov 11 04:00:00 EST 1986

OSTI ID:7069112

Shimomura, S

This patent describes an engine air/fuel sensing device comprising: an air fuel sensor means having a gap portion for receiving an exhaust gas of the engine, a solid electrolyte oxygen pump cell for controlling an oxygen partial pressure within the gap portion, and a solid electrolyte oxygen sensor cell. The sensor cell produces an electromotive force corresponding to the difference between the oxygen partial pressure in the exhaust gas within the gap portion and the oxygen partial pressure in the exhaust gas outside the gap portion; and control circuit means coupled to the sensor means including an input portion for comparing a predetermined reference voltage with the electromotive force to continuously provide an output until the electromotive force reaches the reference voltage. The input portion comprises an input resistor having one end connected to an electrode of the sensor cell, a differential amplifier having an inverting input connected to the other end of the input resistor and a non-inverting input connected to a source of the predetermined reference voltage, and an output portion for driving a pump current through the oxygen pump cell in response to the output of the input portion. It also has a means coupling the output to the input portion having a transfer function of an amplifier component plus an integrator component.

• Assignee: Mitsubishi Denki Kabushiki Kaisha, Tokyo
• Patent Number(s): US 4622126
• OSTI ID: 7069112
• Country of Publication: United States
• Language: English

Related Subjects

33 ADVANCED PROPULSION SYSTEMS
330100* -- Internal Combustion Engines
AMPLIFIERS
CAPACITORS
COMPARATOR CIRCUITS
CURRENTS
ELECTRIC CURRENTS
ELECTRIC POTENTIAL
ELECTRICAL EQUIPMENT
ELECTRODES
ELECTROLYTES
ELECTROMOTIVE FORCE
ELECTRONIC CIRCUITS
ELECTRONIC EQUIPMENT
ELEMENTS
ENGINES
EQUIPMENT
EXHAUST GASES
FEEDBACK
FLUIDS
FUEL-AIR RATIO
GASEOUS WASTES
GASES
HEAT ENGINES
INTERNAL COMBUSTION ENGINES
MEASURING INSTRUMENTS
METERS
NONMETALS
OXYGEN
OXYGEN METERS
PARTIAL PRESSURE
RESISTORS
SOLID ELECTROLYTES
WASTES