Vehicle Load Estimation via Acceleration and Inertia Slopes
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Solution Overview
Problem
Current methods for estimating a motor vehicle's load are either slow or require user intervention, and they fail to accurately determine load when the vehicle is stationary, which is essential for optimal automatic transmission control.
Innovation Solution
A device and method that estimate the load of a motor vehicle using a module that calculates slope values from acceleration and moment of inertia, allowing for automatic transmission control optimization without user input, even when the vehicle is stationary.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a control button is installed to activate the control program for loaded or unloaded vehicle, then the transmission control can be adapted to vehicle load, but the device complexity and cost increase
Solution Approach 1:
The system automatically detects vehicle load conditions through sensors and computational algorithms without requiring user intervention. The load determination module continuously monitors vehicle parameters and autonomously activates the appropriate transmission control program, eliminating the need for manual control buttons while maintaining reliable load-adapted transmission control
Solution Approach 2:
The mechanical control button system is replaced with an electronic sensor-based detection system. The invention uses accelerometers, wheel speed sensors, and computational algorithms to detect vehicle load conditions, substituting mechanical user input with electronic sensing and automated processing
2Loss of information
If existing mass estimation methods are used, then some load information can be obtained, but the estimation is slow and cannot be performed when the vehicle is stationary
Solution Approach 1:
The system performs load estimation calculations continuously and prepares load determination data in advance, so that when transmission control is needed, the information is already available. The load determination module continuously processes sensor data to maintain up-to-date load information, eliminating delays in obtaining load data
Solution Approach 2:
The system uses multiple sensor inputs and computational approaches to over-determine the load condition, processing more data than minimally required to ensure accurate and rapid load estimation. By utilizing accelerometers, wheel speed sensors, and multiple calculation methods, the system achieves both speed and accuracy in load determination
Data Source
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AI summary
A device and method for estimating the charge of a motor vehicle. A device for estimating the charge of a combustion or hybrid powered motor vehicle comprising an automatic transmission, comprising a module (3) for determining the charging of the vehicle capable of determining if the vehicle is charged and an activation module (4) for activating a programme for controlling the automatic transmission (2) on the basis of the determination of the charging of the vehicle (Cons _charge ). The module (3) for determining the charging comprises a first unit (5) for estimating a first slope value on the basis of the acceleration of the vehicle derived from the driving force and the longitudinal acceleration (A total) of the vehicle, a second unit (6) for estimating a second slope value (C slope) on the basis of the moment of inertia (J) applied to a non-driving wheel of the vehicle and the engine and resistant torques (C e, C res) and a third unit (7) for determining the charging of the vehicle (Cons _charge ) on the basis of the first and second slope values (A slope, C slope). Reference: