Method of controlling idling rotational speed in internal combustion engines

Patent · Tue Oct 18 00:00:00 EDT 1988

OSTI ID:6793525

Yasuoka, A

This patent describes a method of controlling idling rotational speed of an internal combustion engine having a throttle valve and control valve arranged in a bypass passage bypassing the throttle valve, wherein the degree to which the control valve is opened is controlled in proportion to a control valve command signal to regulate an amount of air taken into the engine, thereby controlling the idling rotational speed of the engine, the method comprising the steps of: (1) sensing the rotational speed of the engine, as well as a rate of decrease in engine rotational speed when the engine rotational speed is decreasing; (2) determining whether the sensed rotational speed falls below a predetermined value; (3) generating the control valve command signal having a command value dependent upon both the sensed engine rotational speed and the sensed rate of decrease in engine rotational speed when the sensed engine rotational speed falls below the predetermined value, (4) determining whether the sensed rate of decrease in engine rotational speed falls below a predetermined threshold value preset in dependence upon the engine rotational speed; and (5) terminating generation of the control valve command signal when the sensed rate of decrease in engine rotational speed falls below the predetermined threshold value.

• Assignee: Honda Giken Kogyo Kabushiki Kaisha, Tokyo
• Patent Number(s): US 4777918
• OSTI ID: 6793525
• Country of Publication: United States
• Language: English

Related Subjects

33 ADVANCED PROPULSION SYSTEMS
330100* -- Internal Combustion Engines
99 GENERAL AND MISCELLANEOUS
990220 -- Computers
Computerized Models
& Computer Programs-- (1987-1989)
ANGULAR VELOCITY
COMPUTERIZED CONTROL SYSTEMS
CONTROL EQUIPMENT
CONTROL SYSTEMS
DESIGN
ENGINES
EQUIPMENT
FLOW REGULATORS
FUEL SYSTEMS
FUEL-AIR RATIO
HEAT ENGINES
INTERNAL COMBUSTION ENGINES
MEASURING INSTRUMENTS
METERS
OPERATION
VALVES
VELOCITY