Control system for internal combustion engines, provided with an exhaust gas recirculation control having a fail safe function

Patent · Tue Mar 08 04:00:00 EST 1983

OSTI ID:6455291

Hasegawa, S; Narasaka, S; Otsuka, K

A control system for internal combustion engines, which comprises: a power transistor connected to the solenoid of a solenoid valve forming an egr control valve for energization of the same; an abnormality detecting circuit arranged for comparing the input and output levels of the power transistor to generate an output signal when the two levels are out of an inverted relationship; a timer arranged for generating an output signal when the output signal of the abnormality detecting circuit is continuously generated over a predetermined period of time; and emergency means actuatable by the output signal of the timer. The emergency means may include an alarm device and a safety circuit, both responsive to the output of the timer to give the alarm and render the power transistor inoperative, respectively.

• Assignee: Honda Giken Kogyo K K (Japan)
• Patent Number(s): US 4375800
• OSTI ID: 6455291
• Country of Publication: United States
• Language: English

Related Subjects

33 ADVANCED PROPULSION SYSTEMS
330100* -- Internal Combustion Engines
330700 -- Advanced Propulsion Systems-- Emission Control
CONTROL SYSTEMS
ENGINEERING
ENGINES
EQUIPMENT
EXHAUST RECIRCULATION SYSTEMS
EXHAUST SYSTEMS
HEAT ENGINES
INTERNAL COMBUSTION ENGINES
POLLUTION CONTROL EQUIPMENT
SAFETY ENGINEERING