Engine air/fuel ratio sensing device

Patent · Tue Sep 02 04:00:00 EDT 1986

OSTI ID:5194649

Shimomura, S

An air/fuel ratio sensing device for an engine is described which consists of an air/fuel sensor means having a gap portion for introducing 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 for producing 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. It also includes a control circuit means, coupled to the sensor means, having a current amplifier means for supplying to the oxygen pump cell a pump current necessary for keeping the oxygen partial pressure at a predetermined value, and a resistor (Rs) inserted in the electrical path through which the pump current flows for limiting the pump current to a predetermined value.

• Assignee: Mitsubishi Denki Kabushiki Kaisha, Tokyo
• Patent Number(s): US 4609452
• OSTI ID: 5194649
• Country of Publication: United States
• Language: English

Related Subjects

33 ADVANCED PROPULSION SYSTEMS
330603* -- Vehicle Design Factors-- Engine System
AMPLIFIERS
CALIBRATION
COMPUTERIZED CONTROL SYSTEMS
CONTROL SYSTEMS
CURRENTS
ELECTRIC CONDUCTIVITY
ELECTRIC CURRENTS
ELECTRIC POTENTIAL
ELECTRICAL EQUIPMENT
ELECTRICAL PROPERTIES
ELECTROLYTES
ELECTROMOTIVE FORCE
ELECTRONIC EQUIPMENT
ELEMENTS
ENGINES
EQUIPMENT
EXHAUST GASES
FLUIDS
FUEL-AIR RATIO
GASEOUS WASTES
GASES
MEASURING INSTRUMENTS
METERS
NONMETALS
OXYGEN
OXYGEN METERS
PARTIAL PRESSURE
PHYSICAL PROPERTIES
PUMPS
RESISTORS
SIGNALS
SOLID ELECTROLYTES
WASTES