Mando Corporation

Wan Il Kim

Jeong Woo Lee

Jong Heon Kim

Jong Hun Kim

The present invention relates to a method for measuring a vertical acceleration and a velocity of a semi-active suspension system. Particularly, the present invention provides a method for obtaining a vertical acceleration from vertical accelerations measured from three vertical acceleration sensors of a semi-active suspension system of a vehicle, comprising the steps of: receiving first to third vertical accelerations measured from first to third vertical acceleration sensors; and obtaining a fourth vertical acceleration (Ad) by multiplying the first to third vertical accelerations by correction constants and subsequently summing up them. Therefore, according to the present invention, a fourth vertical acceleration can be obtained by multiplying the three vertical accelerations measured from the three acceleration sensors by the constants for correcting them to accelerations at actually desired damper positions and subsequently summing up them, thereby enabling accurate measurement and correction of the vertical accelerations.

Method for measuring vertical acceleration and velocity of semi-active suspension system

The present invention relates to an electronic controlled suspension apparatus capable of stopping vehicle height control when a vehicle turns and performing the vehicle height control when the vehicle goes straight ahead by using vehicle height sensors instead of a steering angle sensor, and a vehicle height control method of the electronic controlled suspension apparatus. To this end, there is provided an electronic controlled suspension apparatus, including a plurality of vehicle height sensors for measuring a height of a vehicle; a vehicle height adjusting actuator operable to adjust the height of the vehicle; air springs controlled by the vehicle height adjusting actuator; and an electronic controlled unit (ECU) for calculating a height difference value between the left and right sides of the vehicle based on vehicle height signals received from the vehicle height sensors and determining whether to operate or stop the vehicle height adjusting actuator through the comparison of the calculated height difference value between the left and right sides of the vehicle with a predetermined reference value.

Electronic controlled suspension apparatus and vehicle height control method thereof

An electronically controlled suspension system according to the present invention comprises a sensor unit for extracting and providing a vertical acceleration component of a vehicle body of a vehicle; a signal processing unit for calculating a vertical velocity of the vehicle body using the vertical acceleration component provided by the sensor unit; a control gain determining unit having a control gain set according to the amplitude of the vertical acceleration component, and detecting the amplitude of the vertical acceleration component provided by the sensor unit and extracting a control gain corresponding to the detected amplitude; a control command value calculating unit for calculating a control command value using the control gain provided by the control gain determining unit and the vertical velocity of the vehicle body provided by the signal processing unit; and a damper driving unit for driving the variable damper based in the control command value. According to the present invention described above, a control command value for use in controlling a damping force of a damper is calculated using a nonlinear control gain according to a signal outputted from a speed or vertical acceleration sensor, thereby securing ride comfort and control stability.

Electrically controlled suspension system

The present invention relates to a method of controlling a variable damper in a vehicle wherein a rear-wheel variable damper can be controlled by estimating a vertical acceleration value of a rear wheel based on the fact that there is a certain time delay in a wheel motion between front and rear wheels due to the wheelbase and vehicle speed. To this end, the method of the present invention comprises the steps of (a) detecting vehicle body accelerations other than a desired vehicle body acceleration of a vehicle body; (b) calculating the desired vehicle body acceleration based on the other detected vehicle body accelerations according to a geometric rule; (c) calculating vehicle body vertical velocities by filtering the vehicle body accelerations to eliminate DC offsets therefrom and integrating the filtered accelerations; (d) detecting accelerations of front right/left vehicle wheels; (e) calculating front wheel vertical velocities by filtering the detected accelerations of the front right/left wheels to eliminate DC offsets therefrom and integrating the filtered accelerations, and then calculating accelerations of rear wheels by time delaying the accelerations of the front wheels by a time interval taken while a road input to the front wheel is delivered to the rear wheel at a vehicle speed; and (f) calculating damper velocities based on the calculated vehicle body vertical velocities and the calculated vehicle wheel vertical velocities. Accordingly, the Sky-hook determination can be more accurately made. Further, since it is not necessary to use all the four sensors, the number of parts of vehicles can be reduced when mass-producing the vehicles. Consequently, the selling prices for finished vehicles can be lowered, and thus, an unnecessary economical burden cannot be imposed on the consumers.

Growing community of inventors

Gyeonggi-do, South Korea

Wan Il Kim