Methods and system for inferring throttle inlet pressure

摘要

Embodiments for controlling boost pressure in a turbocharged engine are provided. In one embodiment, a method for an engine having a throttle comprises, if an inferred throttle inlet pressure (TIP) value is different than a measured TIP value, adjusting a wastegate of a turbocharger based on the inferred TIP value and not based on the measured TIP value, the inferred TIP value based on air flow through the throttle, throttle angle, and manifold absolute pressure (MAP). In this way, boost pressure control may be provided by the inferred TIP value under some conditions.

主权项

1. A method for an engine having a throttle and a turbocharger with a wastegate, comprising:
determining, via a controller, an inferred throttle inlet pressure (TIP) value based on sensors indicating air flow through the throttle, throttle angle, and manifold absolute pressure (MAP); measuring a TIP value with a TIP sensor; comparing the measured TIP value with the inferred TIP value; when the inferred TIP value is different than the measured TIP value, adjusting the wastegate via the controller based on the inferred TIP value and not based on the measured TIP value.