ESC Lateral Acceleration Sensor Verification via Estimation Model
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Solution Overview
Problem
Conventional electronic stability control (ESC) systems using lateral acceleration sensors are limited in preventing malfunctions and enhancing vehicle stability due to external or internal environmental factors, leading to unintended vehicle movement.
Innovation Solution
A vehicle control apparatus that includes an input unit for receiving yaw rate, steering angle, and lateral acceleration values, an estimator for calculating estimated lateral acceleration, and a determiner to identify abnormal values, which then controls the ESC system to prevent malfunctions by compensating for abnormal lateral acceleration readings.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a lateral acceleration sensor is used to determine vehicular movement for ESC control, then the ESC apparatus can control vehicle orientation to prevent reduction in driving stability, but the sensor may output abnormal values due to external or internal environmental factors causing unintended vehicle movement
Solution Approach 1:
The patent introduces an intermediary estimation model that calculates expected lateral acceleration values based on vehicle speed and steering angle. This intermediary calculation serves as a mediator to verify whether the lateral acceleration sensor output is abnormal, preventing direct use of potentially erroneous sensor data for ESC control decisions.
Solution Approach 2:
The system implements feedback by comparing the actual lateral acceleration sensor output with the estimated lateral acceleration value from the model. When a discrepancy is detected, the system feeds back this abnormality information to adjust or inhibit ESC control, preventing malfunction propagation.
2Ease of operation
If the ESC apparatus executes control based on lateral acceleration sensor output, then vehicle orientation can be controlled, but malfunction prevention capability is limited when sensor outputs abnormal values
Solution Approach 1:
The patent performs preliminary verification of sensor data validity before executing ESC control by comparing sensor output with model-based estimation. This preliminary action identifies abnormal sensor values in advance, preventing malfunction-driven control execution while maintaining normal control operations.
3Device complexity
If conventional inertial sensors are used without additional verification mechanisms, then device complexity remains low, but the ability to prevent malfunction and enhance vehicular stability is limited
Solution Approach 1:
The system uses readily available vehicle data (speed and steering angle) that are already measured by existing sensors to generate the estimation model output. This self-service approach verifies lateral acceleration sensor validity without requiring additional external sensors or complex verification systems.
Data Source
AI summary
Disclosed herein are a vehicle control apparatus and a control method thereof. The vehicle control apparatus includes an input unit configured to receive a current yaw rate value, a current steering angle value, and a current lateral acceleration value detected by a detection device, an estimator configured to obtain an estimated lateral acceleration value of lateral acceleration estimation model information on the basis of the received current yaw rate value and current steering angle value, a determiner configured to determine that the current lateral acceleration value is abnormal when the received current lateral acceleration value is not equal to the estimated lateral acceleration value of the lateral acceleration estimation model information, and a controller configured to receive the current yaw rate value, the current steering angle value, and the current lateral acceleration value, deliver an estimation command to the estimator, and deliver a determination command to the determiner.