Ignition timing control system for an automotive engine

Patent · Tue Sep 02 04:00:00 EDT 1986

OSTI ID:5194641

Ohtaki, K; Hara, K

This patent describes an ignition timing control system for an automotive engine with an exhaust gas recirculation system having an exhuast gas recirculation passage and an exhuast gas recirculation valve operated by a vacuum operated actuator provided in the recirculation passage. The improvement described here consists of: a primary vacuum-advance means responsive to the vacuum at a first vacuum port located at a position just above a closed throttle position of an intake passage of the engine for advancing the ignition timing of the engine; secondary vacuum-advance means responsive to the vacuum at a manifold vacuum port of the intake passage for advancing the ignition timing in addition to the operation of the primary vacuum-advance mechanism; a first solenoid valve provided in a passage communicating secondary vacuum-advance mechanism with the manifold vacuum port; a second solenoid valve provided in a passage communicating a second vacuum port of the intake passage with a vacuum chamber of the vacuum operated actuator for the exhaust gas recirculation valve; an electronic control unit responsive to engine operating conditions in a low engine speed range except idling operation for closing the first and second solenoid valves to cut off the exhaust gas recirculation system and to cut off the passage for the first solenoid valve, thereby stopping the advancing of the ignition timing.

• Assignee: Fuji Jukogyo Kabushiki Kaisha, Tokyo
• Patent Number(s): US 4608955
• OSTI ID: 5194641
• Country of Publication: United States
• Language: English

Related Subjects

33 ADVANCED PROPULSION SYSTEMS
330603* -- Vehicle Design Factors-- Engine System
ACTUATORS
CONTROL SYSTEMS
ELECTRIC COILS
ELECTRICAL EQUIPMENT
ELECTRONIC CIRCUITS
ENGINES
EQUIPMENT
EXHAUST RECIRCULATION SYSTEMS
EXHAUST SYSTEMS
IGNITION SYSTEMS
INTAKE STRUCTURES
MECHANICAL STRUCTURES
POLLUTION CONTROL EQUIPMENT
SOLENOIDS
TIMING CIRCUITS
VACUUM SYSTEMS
VEHICLES