Deceleration factor estimating device and drive assisting device

摘要

A deceleration factor estimating device that estimates a deceleration factor of a vehicle includes a road load calculating unit configured to calculate a road load estimated value, and a filtering calculating unit configured to perform filtering processing of extracting a predetermined frequency component of the road load estimated value calculated by the road load calculating unit. The filtering calculating unit extracts a vehicle-originated road load component, an environment-originated road load component, and the like by filtering the road load estimated value to extract a certain predetermined frequency component.

主权项

1. A drive assisting device comprising:
a deceleration factor estimating device that estimates a deceleration factor of a vehicle, the deceleration factor estimating device including
a road load calculating unit configured to calculate a road load estimated value, anda filtering calculating unit configured to perform filtering processing of extracting a predetermined frequency component of the road load estimated value, whereinthe filtering calculating unit extracts a total road load component by performing filtering processing on the road load estimated value with a first time constant,the filtering calculating unit extracts a vehicle-originated road load component by performing filtering processing on the road load estimated value with a second time constant that has a period longer than that of the first time constant, andthe filtering calculating unit calculates an environment-originated road load component by subtracting the vehicle-originated road load component from the total road load component,the vehicle-originated road load component includes resistance generated in a drive system that transmits a driving force generated by a driving source,the environment-originated road load component includes road surface resistance generated between a tire and a road surface; and a drive assisting control unit configured to execute drive assistance using a deceleration factor estimated by the deceleration factor estimating device, wherein each of the road load calculating unit, the filtering calculating unit, and the drive assisting control unit is comprised in at least one electronic control unit (ECU).