Rear Shock Absorber Control Using Front Wheel Acceleration
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Solution Overview
Problem
Existing techniques for controlling shock absorbers in vehicles suffer from reduced ride comfort and accuracy at low speeds, and fail to keep up with changes in vehicle speed, leading to compromised ride comfort.
Innovation Solution
A control apparatus that uses detection values from vehicle behavior sensors to control the force generation mechanism of target wheels, taking into account the movement distance and vehicle speed for each control period to improve ride comfort and adapt to changing speeds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional shock absorber control techniques are used, then the system is simple to implement, but the accuracy of the estimated value deteriorates and ride comfort is reduced when the vehicle runs at low speed
Solution Approach 1:
The control apparatus dynamically adjusts the control strategy based on vehicle speed. When vehicle speed is low, the system switches to a different control mode that accounts for the reduced movement distance, thereby maintaining accurate estimation and ride comfort across all speed conditions.
Solution Approach 2:
The system changes the control parameters based on vehicle speed. Specifically, it considers the movement distance from the detection target portion when controlling the shock absorber, allowing the control parameters to adapt to low-speed conditions where movement distance is small, thus improving estimation accuracy and ride comfort.
2Adaptability or versatility
If conventional shock absorber control techniques are used, then the control system is stable, but the control fails to keep up with changes in vehicle speed, reducing ride comfort
Solution Approach 1:
The control apparatus incorporates feedback mechanisms that continuously monitor vehicle speed and adjust the shock absorber control accordingly. By considering the movement distance based on current vehicle speed, the system provides real-time adaptation to speed changes, maintaining ride comfort through responsive control adjustments.
Solution Approach 2:
The control system is designed to be dynamic rather than static, allowing it to adapt its control characteristics based on changing vehicle speed. This dynamic approach enables the system to keep up with vehicle speed changes and maintain optimal ride comfort across varying operating conditions.
Data Source
AI summary
A controller as a control apparatus controls a shock absorber of a control target wheel (a rear wheel) located in back of a detection target portion (a front wheel) of an unsprung acceleration sensor based on a detection value detected by the unsprung acceleration sensor on the front wheel side provided on a vehicle. In this case, the controller identifies a movement distance (a delay distance) from the detection target portion (the front wheel) and controls the shock absorber of the control target wheel (the rear wheel) located in back thereof based on the detection value of the unsprung acceleration sensor and a vehicle speed for each control period.