Control arrangement for multi-cylinder two cycle engine

• US 5,038,739 A
• Filed: 08/24/1990
• Issued: 08/13/1991
• Est. Priority Date: 09/07/1989
• Status: Expired due to Fees

• Current Assignee: Nissan Motor Co., Ltd.
• Original Assignee: Nissan Motor Co., Ltd.
• Inventors: Ishii, Mitsunori
• Primary Examiner(s): WOLFE JR, WILLIS RAY
• Application Number:
  US07/571,854
• Time in Patent Office: 354 Days
• Field of Search: 123/73 C, 123/73 CB, 123/198 DB, 123/198 F, 123/294, 123/481
• US Class Current: 123/481
• CPC Class Codes: F02B 2075/025 two
• CPC Class Codes: F02B 2075/028 five
• CPC Class Codes: F02B 29/00 Engines characterised by provision for charging or scavenging not provided for in groups F02B25/00, F02B27/00 or F02B33/00 - F02B39/00; Details thereof
• CPC Class Codes: F02D 17/02 Cutting-out cutting-out engines in multiple engine arrangements F02D25/04
• CPC Class Codes: F02D 2400/04 Two-stroke combustion engines with electronic control
• CPC Class Codes: F02D 41/0087 Selective cylinder activation, i.e. partial cylinder operation deceleration cut-off F02D41/123
• CPC Class Codes: Y02T 10/12 Improving ICE efficiencies

Abstract

A multi-cylinder 2 cycle engine having n cylinders has fuel injected and ignited at (n-1)×360/n crank angle intervals. This induces the situation wherein combustions occur in each cylinder at n-1 cycle intervals. This provides at least one piston stroke for each cylinder during in which no combustion takes place and fresh air is pumped through the combustion chamber in a manner to scavenge residual combustion gases therefrom.

Claims

1. In a multi-cylinder two cycle internal combustion engine having n cylinders

an engine load sensor;

an engine speed sensor;

fuel injection control means, said fuel injection control means being responsive to said engine load sensor and said engine speed sensor and arranged to detect the engine operating in a low load-low speed zone, said fuel injection means including circuitry for injecting fuel into any given cylinder at (n-1)×

360/n crank angle intervals and so that combustions in said any given cylinder occur at n-1 cycles, during said low speed low load mode of operation.

2. A multi-cylinder two cycle internal combustion engine as claimed in claim 1 wherein said engine has a poppet type inlet valve and a poppet type exhaust valve.

3. A multi-cylinder two cycle internal combustion engine as claimed in claim 1 wherein said fuel injection control means controls a fuel injector which injects fuel directly into a combustion chamber of the engine.

4. In a method of operating a two cycle internal combustion engine having n cylinders, the steps of:

sensing engine load;

sending engine speed;

detecting the engine operating in a predetermined engine speed-load zone;

controlling the fuel injection so that fuel is injected into a cylinder at (n-1)×

360/n crank angle intervals and so that combustions in said any given cylinder occur at n-1 cycles, when said engine is detected as operating in said predetermined engine speed-load zone.