Air-fuel ratio control apparatus for internal combustion engines

Patent · Tue May 27 04:00:00 EDT 1986

OSTI ID:5502207

Atago, T

An electronic air-fuel ratio control apparatus is described for an internal combustion engine including a throttle actuator for varying the opening of a throttle valve arranged in an intake passage of the engine and at least one fuel injection valve positioned upstream or downstream of the throttle value to inject fuel, thereby controlling the air-fuel ratio of a mixture supplied to the combustion chambers of the engine. The improvement is described which consists of: first sensor means for detecting the rotational speed of the engine and for producing an output signal representative of the rotational speed; second sensor means for detecting an operation command quantity by a driver and for producing an output signal representative of the quantity, including means for detecting an acceleration command by the driver; first computing means responsive to output signals from the first and second sensors for computing at periodic intervals a quantity of fuel to be injected from the fuel injection value; and second computing means responsive to the fuel injection quantity computed by the first computing means at each of the periodic intervals for computing an optimum throttle opening for the computed quantity of fuel to be injected and for driving the throttle actuator to attain the optimum throttle opening independent of the quantity of the driver operation command, including means responsive to detection of the acceleration command by the second sensor means for driving the throttle actuator with a predetermined delay to provide fuel enrichment during acceleration.

• Assignee: Hitachi, Ltd., Tokyo
• Patent Number(s): US 4590912
• OSTI ID: 5502207
• Country of Publication: United States
• Language: English

Related Subjects

33 ADVANCED PROPULSION SYSTEMS
330100* -- Internal Combustion Engines
ACCELERATION
ACTUATORS
COMBUSTION CHAMBERS
COMPUTERIZED CONTROL SYSTEMS
CONTROL EQUIPMENT
CONTROL SYSTEMS
DISPERSIONS
ENGINES
EQUIPMENT
FLOW REGULATORS
FUEL INJECTION SYSTEMS
FUEL SYSTEMS
FUEL-AIR RATIO
HEAT ENGINES
INTAKE STRUCTURES
INTERNAL COMBUSTION ENGINES
MECHANICAL STRUCTURES
MIXTURES
MOTION
ROTATION
SIGNALS
SPEED REGULATORS
VALVES
VELOCITY