×

Valve control system for internal combustion engine

  • US 4,976,228 A
  • Filed: 10/13/1989
  • Issued: 12/11/1990
  • Est. Priority Date: 10/31/1988
  • Status: Expired due to Fees
First Claim
Patent Images

1. A control system for controlling intake and exhaust valves of an internal combustion engine, comprising:

  • electromagnetic actuator means for opening and closing the intake and exhaust valves;

    control means for applying drive signals to said electromagnetic actuator means;

    an engine speed sensor for detecting rotational speed of the internal combustion engine;

    an accelerator pedal movement sensor for detecting the amount of depression of an accelerator pedal which controls a load on the internal combustion engine;

    cylinder control means for determining that the internal combustion engine is idling and cutting off drive signals to the electromagnetic actuator means for selected cylinders of the internal combustion engine when the engine speed based on a detected signal from said engine speed sensor is lower than a preset speed and the amount of depression of the accelerator pedal based on a detected signal from said accelerator pedal movement sensor is smaller than a present amount; and

    modifying means for modifying the cylinders for which the drive signals are cut off by said cylinder control means, depending on a rotational speed of the internal combustion engine.

View all claims
  • 1 Assignment
Timeline View
Assignment View
    ×
    ×