DEVELOPMENT OF THE NISSAN ELECTRONICALLY CONTROLLED CARBURETOR SYSTEM

A closed loop carburetor system has an air/fuel ratio control characterized by the air bleeds being controlled by turning the solenoid valves on and off at a constant frequency. The frequency above 30 Hz was desirable for practical performances. Improvements were made to the solenoid valve, the basic carburetor configuration, and the electronic control unit. An on-off control of the solenoid valve was provided. The system is more capable of maintaining the air/fuel ratio at a constant level under varying engine operating conditions than are conventional carburetors, and requires only minor modification of conventional carburetors and few additional parts. It can be used with many varieties of engines, systems, and vehicles, and is cost-efficient. Application of this carburetor system to a three-way catalytic system proved that emissions can be reduced sufficiently to pass the 1978 Japanese standards. Fuel consumption was improved and oxides of nitrogen emissions were reduced, yet engine performance and driveability remained unimpaired.

• Supplemental Notes:
  • Presented at the SAE Congress and Exposition, Detroit, 27 February-3 March 1978.
• Corporate Authors:

  Society of Automotive Engineers (SAE)

  400 Commonwealth Drive
  Warrendale, PA  United States  15096
• Authors:
  • Masaki, K
  • AONO, S
  • Akaeda, M
  • Minami, H
• Publication Date: 1978

Media Info

• Features: References;
• Pagination: 14 p.

Subject/Index Terms

• TRT Terms: Air quality management; Carburetors; Catalysts; Electronic control; Exhaust gases; Fuel air mixtures; Fuel consumption; Nitric oxide; Nitrogen oxides; Solenoids
• Uncontrolled Terms: Air fuel ratio
• Old TRIS Terms: Exhaust emission control; Three-way catalyst
• Subject Areas: Energy; Safety and Human Factors;

Filing Info

• Accession Number: 00395637
• Record Type: Publication
• Source Agency: National Highway Traffic Safety Administration
• Report/Paper Numbers: SAE 780204, HS-025 347U
• Files: HSL, USDOT
• Created Date: Jun 30 1985 12:00AM