Control device for controlling air-fuel ratio and spark timing of an integral combustion engine

Patent · Tue May 13 04:00:00 EDT 1986

OSTI ID:5758165

Kobayashi, N; Yagi, K; Ito, T

A control device is described for controlling the air-fuel ratio and the ignition timing of an internal combustion engine having a fuel injector, a spark plug, and a throttle valve. The device consists of: first sensor mean for sensing engine operating conditions representative of the quantity of the intake air introduced into the engine; second sensor means for sensing whether the opening of the throttle valve is above a predetermined valve; fuel injection control means including means for determining the air-fuel ratio in response to outputs from the first and second sensor means such that the air-fuel ratio is determined in a first fashion with a first predetermined lean limit value when the opening of the throttle valve is below the predetermined value and in a second fashion with a second predetermined lean limit value when the opening of the throttle valve is above the predetermined value, the first predetermined lean limit value being larger than the second predetermined lean limit value; ignition control means including means for determining an ignition timing in response to outputs from the first and the second sensor means such that the ignition timing is determined in a first timing pattern in relation to the air-fuel ratio in the first fashion and in a second timing pattern in relation to the air-fuel ratio and the second fashion, respectively, the first timing pattern being substantially on the spark advance side with respect to the second timing pattern; and delay means which causes a delay in change-over of the ignition timing between the first and the second timing patterns relative to the change-over of the air-fuel ratio between the first and the second fashions when the opening of the throttle valve is changed beyond the predetermined value.

• Assignee: Toyota Jidosha Kabushiki Kaisha, Toyota
• Patent Number(s): US 4587938
• OSTI ID: 5758165
• Country of Publication: United States
• Language: English

Related Subjects

33 ADVANCED PROPULSION SYSTEMS
330101* -- Internal Combustion Engines-- Spark-Ignition
COMPUTERIZED CONTROL SYSTEMS
CONTROL EQUIPMENT
CONTROL SYSTEMS
DESIGN
ELECTRONIC CIRCUITS
ENGINES
EQUIPMENT
FLOW REGULATORS
FUEL INJECTION SYSTEMS
FUEL SYSTEMS
FUEL-AIR RATIO
HEAT ENGINES
IGNITION
INTERNAL COMBUSTION ENGINES
SPARK IGNITION ENGINES
TIMING CIRCUITS
VALVES