Apparatus and method for detecting rough road travel of a vehicl

Details Apparatus and method for detecting rough road travel of a vehicl Apparatus and method for detecting rough road travel of a vehicl

1995-04-10

1996-04-16

Chilcot, Richard

Measuring and testing

Vehicle chassis

Steering

G01M 1500

Patent

active

055071805

ABSTRACT:
A signal indicating that a road on which a vehicle is travelling is not a rough road is output when a fluctuation frequency of an engine rotational speed and a fluctuation frequency of a combustion pressure are in approximate agreement, and a fluctuation amplitude of an engine rotational speed is greater by a predetermined value or above than a fluctuation amplitude of a combustion pressure. In other cases a signal indicating that the road on which the vehicle is travelling is not a rough road is output. During rough road travel, misfire detection based on engine rotational speed or combustion pressure is inhibited.

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