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Turbocharger bypass control for internal combustion engines

  • US 4,459,809 A
  • Filed: 02/23/1982
  • Issued: 07/17/1984
  • Est. Priority Date: 02/24/1981
  • Status: Expired due to Term
First Claim
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1. An internal combustion engine comprising combustion chamber means, intake passage means leading to said combustion chamber means for supplying intake charge thereto, exhaust passage means leading from said combustion chamber means for passing exhaust gas, supercharging means provided in said intake passage means, exhaust turbine means provided in said exhaust passage means for driving the supercharging means provided in the intake passage means, charging pressure limiting means for limiting charging pressure in said intake passage means downstream of said supercharging means, said charging pressure limiting means including charging pressure adjusting means comprising bypass passage means bypassing said exhaust turbine means and control valve means for controlling gas flow in said bypass passage means, engine speed sensing means for detecting engine speed and producing an engine speed signal, charging pressure sensing means for detecting the charging pressure in said intake passage means downstream of said supercharging means and producing a charging pressure signal, and control means adapted for receiving said engine speed signal and said charging pressure signal and producing an output for actuating said adjusting means by providing a limit signal corresponding to a limit value of the charging pressure which decreases in response to an increase in the engine speed above a predetermined engine speed value, and comparing means for comparing said charging pressure signal with said limit signal to provide said output for actuating said adjusting means when said charging pressure reaches the limit value so that the charging pressure does not exceed the limit value.

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