Vehicle Roll Prediction Damper Control Using Steering Data
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Solution Overview
Problem
Existing motor vehicle suspension shock absorber systems face challenges in adaptability to varying driving conditions, requiring complex and numerous sensors for real-time dynamic behavior monitoring, which complicates installation, increases weight, and reduces reliability.
Innovation Solution
A simplified control system that calculates an estimated roll movement of the vehicle using parameter values such as longitudinal speed and steering wheel speed, deducing a control value for shock absorbers, allowing continuous adaptation of damping behavior without the need for additional sensors, and can be integrated with existing vehicle systems like ESP.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If numerous complex sensors (accelerometers, gyroscopes, gyrometers) are used to monitor vehicle dynamic behavior in real time, then the adaptability to driving conditions is improved, but the device complexity, weight, and installation complexity increase significantly
Solution Approach 1:
The patent extracts only the essential measurement function needed for roll movement detection, replacing it with a simplified sensor arrangement that uses fewer sensors (specifically using wheel speed sensors and steering angle sensor data) while maintaining the capability to detect roll movements and adapt damping behavior to driving conditions
Solution Approach 2:
The patent makes existing sensors serve multiple functions: wheel speed sensors originally designed for other purposes are also used to calculate roll movement, and steering angle sensors provide data for both steering control and roll detection, eliminating the need for dedicated complex sensor systems
2Measurement precision
If numerous sensors and their wiring are built into the vehicle for real-time monitoring, then the measurement precision of roll movements is improved, but the ease of manufacture and installation deteriorates
Solution Approach 1:
The patent extracts the measurement function from a complex multi-sensor system and implements it using a simplified arrangement of existing sensors, reducing wiring requirements and making the system easier to manufacture and install while maintaining sufficient measurement precision for roll detection
Solution Approach 2:
The system uses data already being collected by existing vehicle sensors for other functions (wheel speed, steering angle) and repurposes it for roll movement detection, eliminating the need for additional dedicated sensors and wiring infrastructure
3Reliability
If the number of sensors is increased to improve real-time monitoring capability, then the reliability of the system deteriorates
Solution Approach 1:
The patent removes unnecessary sensors from the system, keeping only the essential measurement functions needed for roll detection, thereby reducing the number of potential failure points while maintaining adequate monitoring capability through clever use of existing sensor data
Solution Approach 2:
The system continuously monitors roll movement using simplified sensor input and provides real-time feedback to the damping control system, maintaining adaptability through continuous adjustment based on the processed sensor data from the reduced sensor arrangement
4Measurement precision
If complex sensor arrangements are placed in cluttered areas such as near wheel centers and wheel arches, then the measurement capability is improved, but the ease of operation and design complexity increases
Solution Approach 1:
The patent extracts the measurement function from cluttered areas near the wheels and implements it using sensors located in more accessible positions, such as using data from wheel speed sensors and steering angle sensors that are already positioned in accessible locations
Solution Approach 2:
The patent uses computational processing as an intermediary to derive roll movement information from easily accessible sensor data (wheel speeds, steering angle) rather than requiring direct physical sensors in difficult-to-reach locations near wheel centers
Data Source
Figure 1~2
AI summary
The invention relates to a control system for the suspension shock absorbers (22, 23, 24, 25) of a motor vehicle (9), comprising a roll prediction block (10) and a control calculation block (30). The roll prediction block (10) receives the longitudinal velocity and the steering wheel rotation speed at time t0 and then calculates a roll motion at time t1 as a function of the longitudinal velocity and the steering wheel rotation speed. The control calculation block (30) deduces a control value for the shock absorbers based on the estimated roll motion and a pre-established map. The control calculation block (30) receives the residual roll motions at time t1 and deduces a time-dependent decay of the control value.