Compensation of throttle area using intake diagnostic residuals

A method for compensating throttle area in an engine control system with an electronic throttle using intake diagnostic residuals, comprising:

• providing a first table that relates throttle area to breakpoint numbers and residual values;
• providing a second table that relates residual values to flow loss factors;
• providing a third table that relates flow loss factors to breakpoint numbers;
• providing a fourth table that relates throttle area to breakpoint numbers;
• and
• updating at least one of said tables based on said intake diagnostic residuals to generate a compensated throttle area.

A throttle area compensation system for an engine control system with an electronic throttle, comprising:

• an intake diagnostic that generates residuals;
• memory containing a plurality of tables that relate throttle area, breakpoint numbers, flow loss factors and residual values;
• and
• a throttle area compensation calculator that updates at least one of said tables based on said intake diagnostic residuals and generates a compensated throttle area based on said tables.