Wheel Acceleration Jerk Detection for Stable Vehicle Speed Control
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Solution Overview
Problem
Existing vehicle control systems face challenges in precisely controlling target vehicle speed due to excessive motor driving and hydraulic pressure release from Traction Control Valves (TCVs), leading to oscillation and reduced riding comfort.
Innovation Solution
A control device comprising a sensor unit to detect wheel acceleration, a filter unit to generate a wheel acceleration graph, a storage unit to update reference points, a slope calculation unit to determine slope changes, and a determination unit to identify jerks, which adjusts the TCV and motor control to maintain hydraulic pressure and reduce vibrations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the TCV and motor of the electric brake are used to control the target vehicle speed, then the vehicle speed control function is achieved, but the motor may be excessively driven due to tuning problems or hydraulic pressure may be excessively released from the TCV due to insufficient current, making it difficult to precisely follow the target vehicle speed
Solution Approach 1:
The control device predicts future wheel acceleration values based on current acceleration and historical data before actual hydraulic pressure release occurs. This preliminary prediction allows the system to prepare corrective actions in advance, preventing excessive motor driving and ensuring precise vehicle speed control during RSPA operations.
Solution Approach 2:
The system continuously monitors wheel acceleration, compares actual values with predicted values, and adjusts motor driving and TCV current in real-time based on the deviation. This closed-loop feedback mechanism prevents excessive motor driving and ensures hydraulic pressure is maintained at appropriate levels for precise speed control.
2Ease of operation
If the ball for opening or closing the TCV is not properly seated, then the ball may be displaced and hydraulic pressure may be excessively released from the TCV, but this causes oscillation of the speed and acceleration of the vehicle, resulting in vibration and reduced riding comfort
Solution Approach 1:
The control device predicts wheel acceleration changes before they occur by analyzing current acceleration trends and historical data. When displacement is predicted, the system proactively adjusts motor driving and TCV current to compensate, preventing oscillation and vibration before they affect riding comfort.
Solution Approach 2:
The system continuously compares predicted wheel acceleration with actual acceleration, detecting discrepancies that indicate ball displacement. Real-time feedback allows the control device to adjust TCV current and motor driving to stabilize hydraulic pressure, eliminating oscillation and vibration caused by improper ball seating.
Data Source
AI summary
A control device for a vehicle includes a sensor unit detecting wheel acceleration based on a wheel speed of a wheel of the vehicle; a filter unit generating a wheel acceleration graph using the wheel acceleration detected by the sensor unit; a storage unit updating and storing a reference point of the wheel acceleration on the wheel acceleration graph; a slope calculation unit calculating a slope of the wheel acceleration based on the reference point on the wheel acceleration graph; and a determination unit determining whether a jerk occurred in the vehicle using a change amount of the reference point and the slope of the wheel acceleration.