Apparatus and method for detecting rough road travel of a vehicle, and apparatus and method for detecting misfire of a vehicle engine
AssigneeUnisia Jecs Corporation
InventorNaoki Tomisawa
Life of this patent
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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.
Claims10
An apparatus for detecting rough road travel of a vehicle, said apparatus comprising:
- rotational speed detection means for detecting a rotational speed of an engine, combustion pressure detection means for detecting a combustion pressure of the engine, and
- rough road judgment means for comparing a fluctuation characteristic of rotational speed detected by said rotational speed detection means, and a fluctuation characteristic of combustion pressure detected by said combustion pressure detection means, and outputting a judgement signal indicating whether or not a road on which the vehicle is travelling is a rough road.
A method of detecting rough road travel of a vehicle including, outputting a signal indicating that a road on which the vehicle is travelling is a non-rough road when a fluctuation frequency of an engine rotational speed and a fluctuation frequency of a combustion pressure are not in agreement, and outputting a signal indicating that the road on which the vehicle is travelling is a rough road, at least under conditions where the fluctuation frequency of the engine rotational speed and the fluctuation frequency of the combustion pressure are in agreement.
A method of detecting rough road travel of a vehicle including, outputting a signal indicating that a road on which the vehicle is travelling is a rough road 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 the engine rotational speed is greater by a predetermined value or above than a fluctuation amplitude of the combustion pressure, and outputting a signal indicating that the road on which the vehicle is travelling is not a rough road in other cases.
Dependencies are inferred from the claim text.