Automated active variable geometry turbocharger diagnosis system

An engine exhaust system, comprising:

• a variable geometry turbine adapted to receive exhaust gasses exiting an engine;
• a compressed air reserve;
• a capsule pneumatically connected between the compressed air reserve and the variable geometry turbine;
• a pressure regulator pneumatically connected between the compressed air reserve and the capsule;
• a pressure sensor pneumatically connected between the pressure regulator and the capsule;
• and
• an electronic controller electrically connected to the variable geometry turbine position sensor, to the pressure regulator, and to the pressure sensor;
• wherein the electronic controller is adapted to periodically initiate a variable geometry turbine diagnostic routine;
• and
• wherein the variable geometry turbine diagnostic routine includes a sinusoidal control signal sent to the pressure regulator to actuate sinusoidal movement of the variable geometry turbine.

A diagnostic system for engine systems having variable geometry turbines, comprising:

• a variable geometry turbine position sensor operationally connected to the variable geometry turbine;
• a compressed air reserve;
• a capsule pneumatically connected between the compressed air reserve and the variable geometry turbine;
• a pressure regulator pneumatically connected between the compressed air reserve and the capsule;
• a pressure sensor pneumatically connected between the pressure regulator and the capsule;
• and
• an electronic controller electrically connected to the variable geometry turbine position sensor, to the pressure regulator, and to the pressure sensor.