Apparatus for controlling operation of inlet and exhaust valves and supply of fuel to selected cylinders of all of multi-cylinder I. C. engine

• US 4,188,933 A
• Filed: 08/30/1978
• Issued: 02/19/1980
• Est. Priority Date: 10/26/1977
• Status: Expired due to Term

• Current Assignee: Nissan Motor Co., Ltd.
• Original Assignee: Nissan Motor Co., Ltd.
• Inventors: Iizuka, Haruhiko
• Primary Examiner(s): Lazarus, Ira S.
• Application Number:
  US05/937,997
• Time in Patent Office: 538 Days
• Field of Search: 123/198 F, 123/32 EA, 123/32 EI, 123/97 B
• US Class Current: 123/198.00F
• CPC Class Codes: F02D 13/06 Cutting-out cylinders
• CPC Class Codes: Y02T 10/12 Improving ICE efficiencies

Abstract

An apparatus for controlling the operation of inlet and exhaust valves and the supply of fuel to selected cylinders of all of a multi-cylinder internal combustion engine. The inlet and exhaust valves for induction and exhaust of the selected cylinders of all are closed and the supply of fuel to them is cut off to operate the engine on the remaining cylinders of all. According to the invention, a detector to detect a predetermined control event in which the engine is to be decelerated is provided. Also provided is a valve operation restoring device for causing restoration of the disabled valves when said detector detects the predetermined control event to let the disabled cylinders to pump air to achieve effective engine braking.

Claims

1. In combination, a multi-cylinder internal combustion engine including a plurality of cylinders, each being provided with an inlet valve and an exhaust valve, the plurality of cylinders consisting of a first group of cylinders and a second group of cylinders;

electrically energizable fuel injectors for said plurality of cylinders, respectively, and adapted when energized to discharge fuel adjacent said inlet valves, respectively, for induction into said plurality of cylinders;

an engine load detection means for detecting a first predetermined control event in which said engine is to run on said first group of cylinders;

means for disabling the fuel injectors adapted to discharge fuel adjacent the inlet valves, respectively, as long as said engine load detection means detects said first predetermined control event;

means for detecting a second predetermined control event in which said engine is to be decelerated;

first valve operating means for causing said inlet and exhaust valves to perform induction and exhaust of said first group of cylinders;

second valve operating means for causing said inlet and exhaust valves to perform induction and exhaust of said second group of cylinders;

valve disabling means for disabling said second valve operating means so that said inlet and exhaust valves for said second group of cylinders are maintained in their closed positions; and

valve operation restoring means for causing said valve disabling means to restore normal operation of said inlet and exhaust valves for induction and exhaust of said second group of cylinders to allow said second group of cylinders to pump air when said detecting means detects said second control event while said engine load detection means detects said first predetermined control event.