Emission control system for an internal combustion engine

Patent · Tue Jun 29 00:00:00 EDT 1993

OSTI ID:6349354

Stueven, J S

A system for controlling the air/fuel mixture input to an internal combustion engine is described which comprises: a sensor mounted to the engine for sensing the level of an exhaust gas and producing an analog signal indicative of that level; means for producing a reference level signal indicative of the desired level of the exhaust gas; a comparator connected to receive the analog exhaust gas signal and the reference level signal and being operable to produce a first logic level output if the analog exhaust gas signal exceeds the reference level signal and produce a second logic level output if the analog exhaust gas signal is less than the reference level signal; a clock for producing clock pulses; a flip-flop connected to the comparator and the clock and being operable to store the state of the comparator output each time a clock pulse is received and to produce a corresponding direction signal at an output; a stepper motor mounted to the engine for controlling the air/fuel mixture; and a stepper motor control connected to the clock and the flip-flop and being operable to advance the stepper motor one step for each received clock pulse in the direction indicated by the state of the flip-flop.

• Assignee: Kohler Corp., WI (United States)
• Patent Number(s): A; US 5222471
• Application Number: PPN: US 7-947246
• OSTI ID: 6349354
• Country of Publication: United States
• Language: English

Related Subjects

33 ADVANCED PROPULSION SYSTEMS
330603 -- Vehicle Design Factors-- Engine System
330700* -- Advanced Propulsion Systems-- Emission Control
COMPUTERIZED CONTROL SYSTEMS
CONTROL SYSTEMS
ELECTRIC MOTORS
ENGINES
EQUIPMENT
FUEL SYSTEMS
FUEL-AIR RATIO
HEAT ENGINES
INTERNAL COMBUSTION ENGINES
MOTORS
ON-LINE CONTROL SYSTEMS
ON-LINE MEASUREMENT SYSTEMS
ON-LINE SYSTEMS
POLLUTION CONTROL EQUIPMENT