Vehicle Center of Gravity Adjustment via Wheel Force Differential
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Solution Overview
Problem
Existing methods for determining the height of the center of gravity (HCOG) of a vehicle are slow to adapt to changing conditions, leading to inadequate activation of dynamic control functions, particularly during the initial phases of vehicle operation.
Innovation Solution
A method that quickly adjusts the HCOG value by computing the difference between normal forces on the front and rear wheels using two concomitant determinations: one independent of the HCOG and another involving a variable parameter related to the HCOG, with iterative adjustments during a braking period to minimize the difference between these values.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If statistical data collection methods are used to determine HCOG value, then measurement precision is improved, but loss of time increases
Solution Approach 1:
The patent applies preliminary action by pre-calculating and storing HCOG values for different payload configurations before actual vehicle operation. During runtime, the system directly retrieves the pre-computed HCOG value based on detected payload conditions, eliminating the need for time-consuming statistical data collection during vehicle operation. This resolves the contradiction by performing the computationally intensive work in advance.
Solution Approach 2:
The patent replaces the mechanical/statistical data collection approach with a computational model-based approach. Instead of collecting and analyzing statistical data from sensor measurements over time, the system uses a pre-established computational model that calculates HCOG values based on payload mass and configuration parameters. This substitution eliminates the time delay inherent in statistical methods while maintaining precision.
2Reliability
If HCOG value is not quickly adjusted, then dynamic control functions may be inappropriately activated, but rapid adjustment requires complex computation
Solution Approach 1:
The patent applies preliminary action by pre-computing HCOG values for various payload scenarios and storing them in a lookup table or database. When the vehicle operates, the system quickly retrieves the appropriate HCOG value based on detected payload conditions, avoiding complex real-time computations. This ensures reliable dynamic control function activation without requiring complex computational systems during operation.
Solution Approach 2:
The system applies self-service by automatically selecting and adjusting the HCOG value based on detected payload mass and configuration, without requiring manual calibration or complex external computation systems. The pre-established model enables the system to self-adjust to different operating conditions reliably.
Data Source
AI summary
A method for adjusting an estimated height of the center of gravity (HCOG) value of a vehicle includes concomitant calculations, based on parameters dependent on the HCOG value and parameters independent from the HCOG value. The method further comprises the adjustment of a parameter related to the HCOG value.