Vehicle Nose Dive Estimation Using Acceleration and Pitch Angle
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Solution Overview
Problem
Existing methods for identifying the amount of nose dive in vehicles require sensors to detect suspension stroke, which can increase vehicle costs.
Innovation Solution
A control device that uses an inertial sensor unit to detect acceleration in the front-and-rear direction, calculating braking force and pitch angle to estimate nose dive without a sensor for suspension stroke detection, allowing for skyhook control to improve ride comfort.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a sensor that detects the amount of suspension stroke is used to identify the amount of nose dive, then the accuracy of nose dive identification is improved, but the vehicle cost increases
Solution Approach 1:
The patent creates a virtual model of the suspension system that replicates the behavior of physical sensors. By using acceleration sensor data combined with vehicle parameters (spring constants, damping coefficients, mass distribution) in a mathematical model, the system generates accurate nose dive identification without requiring expensive physical suspension stroke sensors. This virtual copy approach maintains measurement precision while eliminating the need for additional costly hardware.
Solution Approach 2:
The patent replaces the mechanical sensor-based detection system with a computational model. Instead of using physical sensors to directly measure suspension stroke, the system substitutes a mathematical model that processes acceleration sensor data to calculate nose dive amount. This substitution eliminates the need for complex mechanical sensing hardware while achieving the same functional goal of accurate nose dive identification.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach eliminates the need for costly sensors to detect suspension stroke, enabling effective estimation and control of nose dive, thereby enhancing ride comfort by reducing attitude changes during braking.
Implementation Method 1
an inertial sensor unit configured to detect acceleration in a front-and-rear direction generated in the vehicle
Data Source
AI summary
The present invention provides a control device of a vehicle, comprising: a detector configured to detect acceleration in a front-and-rear direction generated in the vehicle; and an estimation unit configured to calculate a braking force of the entire vehicle and a pitch angle of the vehicle based on the acceleration detected by the detector, and estimate an amount of nose dive of the vehicle during braking of the vehicle based on the calculated braking force of the entire vehicle and the calculated pitch angle of the vehicle.