Controller for vehicle including computation of a feedback amount based on a filtered input signal

摘要

When an idle speed control is implemented, an engine speed is computed based on an output signal of a crank angle sensor at a specified processing angle interval, and a time interval corresponding to the specified processing angle interval is computed. Then, the engine speed is filtered at a specified processing time interval, and a feedback amount (throttle opening correction amount) is computed based on a deviation of an engine speed filtered by a filter portion from a target engine speed. A time constant of a filtering processing is established according to the processing angle interval. Therefore, a filtering processing and a feedback control processing are performed in synchronization with each other, and an instability of an output of the feedback control (feedback amount) can be reduced.

主权项

1. A controller for a vehicle, comprising:
an input computing portion which computes an input signal for a feedback control; a filter portion which performs a filtering processing for filtering the input signal; and a feedback amount computing portion which computes a feedback amount based on both the input signal filtered by the filter portion and a target input value; wherein: at least one of a first processing time interval at which the input computing portion computes the input signal and a second processing time interval at which the feedback amount computing portion computes the feedback amount is varied; a third processing time interval at which the filter portion filters the input signal is established equal to the second processing time interval; the filter portion sets the first processing time interval as a time constant of the filtering processing; the first processing time interval becomes longer than the second processing time interval; and a control of a vehicle component is based on the computed feedback amount.