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Internal combustion engine

  • US 4,337,740 A
  • Filed: 06/18/1980
  • Issued: 07/06/1982
  • Est. Priority Date: 06/22/1979
  • Status: Expired due to Term
First Claim
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1. An internal combustion engine comprising:

  • (a) first and second cylinder units, each said units including at least one cylinder;

    (b) an intake passage having disposed therein a throttle valve and being divided downstream of said throttle valve into first and second branches communicating with said first and second cylinder units, respectively, said second branch having an intake entrance;

    (c) a stop valve positioned generally in the vicinity of said intake entrance of said second branch;

    (d) an exhaust gas sensor for providing a signal indicative of the air/fuel ratio at which said engine is operating;

    (e) fuel supply means for supplying fuel to said first and second cylinder units, said fuel supply means including means responsive to engine loads for determining a basic value of fuel supply amount and means responsive to the air/fuel ratio indication signal from said exhaust gas sensor for correcting said basic value to maintain a desired air/fuel ratio;

    (f) control means for cutting off the supply of fuel to said second cylinder unit to shift engine operation from a full engine mode into a split engine mode, and for closing said stop valve to shut off the flow of fresh air to said second cylinder unit, and for providing a low load indication signal when the engine load is below a predetermined value; and

    (g) wherein said fuel supply means is responsive to the low load indication signal from said control unit for determining said basic value of fuel supply amount to create a mixture having an air/fuel ratio richer than said desired air/fuel ratio, whereby an air/fuel mixture leaner than said desired air/fuel mixture is obtained temporarily when the engine operation is shifted from a split engine mode into a full engine mode and an air/fuel mixture richer than said desired air/fuel mixture is obtained temporarily when the engine operation is shifted from the full engine mode into a split engine mode.

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