Control apparatus of a variable damping force damper
AssigneeHonda Motor Co., Ltd.
InventorShigenobu Sekiya
Life of this patent
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Abstract
A control apparatus of a variable damping force damper comprises first and second low-pass filters for cutting off high frequency components of a target current of the damper, where the first and second low-pass filters have different response characteristics. The control apparatus further comprises a low-pass filter selection unit for selecting one of the first and second low-pass filters based on at least one of the dynamic state of the vehicle body and the road surface condition.
Claims14
A control apparatus of a variable damping force damper of a current control type used to suspend a vehicle body of a vehicle, comprising:
- a dynamic state sensor for detecting a dynamic state of the vehicle body;
- a road surface condition determination unit for determining a surface condition of a road on which the vehicle is traveling;
- a target damping force setting unit for setting a target damping force of the variable damping force damper based on the dynamic state of the vehicle body detected by the dynamic state sensor, the target damping force setting unit performing an attitude control under a prescribed dynamic state of the vehicle body;
- a target current setting unit for setting a target current for the variable damping force damper based on the target damping force set by the target damping force setting unit and a stroke speed of the variable damping force damper;
- a first low-pass filter for cutting off high frequency components of the target current;
- a second low-pass filter for cutting off high frequency components of the target current, the second low-pass filter having a different response characteristic from that of the first low-pass filter;
- and
- a low-pass filter selection unit for selecting one of the first and second low-pass filters based on at least one of the dynamic state of the vehicle body detected by the dynamic state sensor and the road surface condition determined by the road surface condition determination unit,
- the low-pass filter selection unit selecting the first low-pass filter when an irregular road surface is detected by the road surface condition determination unit or when the attitude control is not being performed, and selecting the second low-pass filter when an irregular road surface is not detected by the road surface condition determination unit and the attitude control is being performed.
A method for controlling a variable damping force damper of a current control type used to suspend a vehicle body of a vehicle, the method comprising the steps of:
- detecting a dynamic state of the vehicle body;
- determining a surface condition of a road on which the vehicle is traveling;
- setting a target damping force of the variable damping force damper based on the dynamic state of the vehicle body, an attitude control being performed under a prescribed dynamic state of the vehicle body;
- detecting a stroke speed of the variable damping force damper;
- setting a target current for the variable damping force damper based on the target damping force and the stroke speed;
- and
- cutting off high frequency components of the target current with a low-pass filter, wherein the step of cutting off high frequency components comprises a step of selecting one of a first low-pass filter and a second low-pass filter based on at least one of the dynamic state of the vehicle body and the road surface condition, the first and second low-pass filters having different response characteristics from each other,
- wherein the first low-pass filter is selected when an irregular road surface is detected or when the attitude control is not being performed, and the second low-pass filter is selected when an irregular road surface is not detected and the attitude control is being performed.
Dependencies are inferred from the claim text.