Control device of supercharger-equipped engine

A control device of a supercharger-quipped engine, the engine comprising:

• a supercharger provided in an intake passage and an exhaust passage of the engine and configured to increase pressure of intake air in the intake passage,
• the supercharger including a compressor placed in the intake passage, a turbine placed in the exhaust passage, and a rotary shaft connecting the compressor and the turbine to cause the compressor and the turbine to integrally rotate;
• an intake amount regulating valve provided in the intake passage downstream from the compressor and configured to have an adjustable opening degree to regulate an intake amount of air flowing through the intake passage;
• an evaporated fuel treatment device configured to collect evaporated fuel generated in a fuel tank into a canister once and purge the evaporated fuel to the intake passage through a purge passage provided with a purge valve configured to have an adjustable opening degree,
• the purge passage including an inlet connected to the canister and an outlet connected to the intake passage upstream from the compressor;
• an inlet valve provided in the intake passage upstream from the outlet of the purge passage and configured to have an adjustable opening degree to restrict the intake amount of air to be sucked into the intake passage;
• an intake flow detecting unit configured to detect the intake amount of air flowing through the intake passage upstream from the inlet valve;
• and
• a control unit configured to control at least the intake amount regulating valve, the purge valve, and the inlet valve,
• wherein the control unit is configured to:
• when controlling the purge valve to fully close, controlling the inlet valve to fully open, and further controlling the intake amount regulating valve to an arbitrary controlled opening degree so that intake air passes through the intake amount regulating valve at sonic velocity,
• obtain an actual opening degree of the intake amount regulating valve based on the intake amount detected by the intake flow detecting unit and a predetermined basic expression;
• learn an opening degree correction value of the intake amount regulating valve from a difference between the obtained actual opening degree and the controlled opening degree;
• and
• correct control of the intake amount regulating valve based on the learnt opening degree correction value, and
• the control unit is configured to:
• after correcting the control of the intake amount regulating valve based on the learnt opening degree correction value of the intake amount regulating valve,
• when controlling the purge valve to fully close and controlling the inlet valve to close to the arbitrary controlled opening degree;
• obtain an actual opening degree of the inlet valve based on the intake amount detected by the intake flow detecting unit and the basic expression;
• learn an opening degree correction value of the inlet valve from a difference between the obtained actual opening degree and the controlled opening degree of the inlet valve;
• and
• correct control of the inlet valve based on the learnt opening degree correction value.