Abstract: A design evaluation system 10 which evaluates a design 44 of a component or assembly, such as component or assembly 12. Particularly, system 10 includes a database 30 having several equality and inequality relationships which are required to be satisfied by the design 44. System 10 also includes several equality and inequality relationships which system 10 attempts to have satisfied by the design 44, but which are not required to be satisfied. System 10 further dynamically modifies the values of certain variables within the design 44 in order to substantially ensure that the design 44 is modified in a manner which is consistent with certain of the equality and inequality relationships which are contained within the database 30.

Abstract: An internal combustion engine having electronic throttle control includes an air assisted injector system for directing a controlled amount of air directly to the combustion chamber without passing through the throttle body. A method of diagnosing faults in the air assisted injector system is disclosed. The method comprises the steps of measuring the airflow entering an intake of the electronic throttle of the engine at idle speed with the air assisted injector system operating at a first rate of airflow, turning the air assisted injector system off, measuring the airflow entering the intake of the electronic throttle of the engine at idle speed with the air assisted injector system off, and generating an error signal as a function of the two measured values.