Idling speed feedback control method for internal combustion engines

Patent · Tue Jul 21 04:00:00 EDT 1987

OSTI ID:6256881

Yamato, A; Koike, Y; Futa, K

A method is described of controlling the operating amount of a control valve for regulating the quantity of supplementary air being supplied to an internal combustion engine, in a feedback manner responsive to the difference between a desired idling speed and an actual engine speed, while the engine is in a predetermined idling region, the engine having an intake passage, a throttle valve arranged in the intake passage, and an air passage having one end communicating with the intake passage at a location downstream of the throttle valve and another end with the atmosphere, respectively. The control valve is arranged in the air passage, the supplementary air being supplied to the engine through the air passage and the intake passage, the method comprising the steps of: (a) detecting a temperature of the engine; (b) detecting the decreasing rate of the rotational speed of the engine when the engine is decelerating with the throttle valve fully closed in a predetermined idling region; (c) correcting a basic value of the operating amount of the control valve based upon the detected temperature of the engine and the detected decreasing rate of the rotational speed of the engine; and (d) starting the feedback control by applying the basic value of the operating amount of the control valve thus corrected as an initial value when the engine is further decelerated into the predetermined idling region.

• Assignee: Honda Giken Kogyo Kabushiki Kaisha, Tokyo
• Patent Number(s): US 4681075
• OSTI ID: 6256881
• Country of Publication: United States
• Language: English

Related Subjects

33 ADVANCED PROPULSION SYSTEMS
330100* -- Internal Combustion Engines
AIR FLOW
COMPUTERIZED CONTROL SYSTEMS
CONTROL EQUIPMENT
CONTROL SYSTEMS
ENGINES
EQUIPMENT
FEEDBACK
FLOW REGULATORS
FLUID FLOW
GAS FLOW
HEAT ENGINES
INTAKE STRUCTURES
INTERNAL COMBUSTION ENGINES
MECHANICAL STRUCTURES
SPEED REGULATORS
TEMPERATURE MEASUREMENT
VALVES
VELOCITY