Patent ID: 7926270
Filing Date: 2011-04-19
Classification: F01N,F02B,F02D,Y02T

Abstract:
1. A method to operate a turbocharger and a waste-gate in an internal combustion engine, said waste-gate having a spring assisted waste-gate closing mechanism, the method comprising: applying a first force to operate a waste-gate actuator; applying a second force by a spring acting in opposition to said first force, said second force being the force applied when said waste-gate is in a closed position; in a first condition, wherein a desired boost pressure is not met, commanding said first force to a level that is less than said second force when a desired force of said first force is less than said second force plus a predetermined force offset; and in a second condition, wherein the desired boost pressure is met, commanding said first force to a level that is greater than said second force plus said predetermined force offset when said desired force of said first force is greater than said second force plus said predetermined force offset.