EV Torque-Based Mass Estimation for Real-Time Braking Control
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Solution Overview
Problem
Existing mass estimation systems for medium- and heavy-duty vehicles, particularly electric vehicles, fail to provide accurate real-time mass measurements when the vehicle is in motion, affecting braking systems and stability control.
Innovation Solution
A system utilizing a vehicle control module, inverter, and electric motor to measure torque output, enabling real-time mass estimation through static and dynamic methods, including system identification techniques, to determine mass based on torque output and vehicle dynamics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional weigh stations and air suspension systems are used to estimate vehicle mass, then mass estimation is possible, but real-time accuracy during vehicle motion is insufficient
Solution Approach 1:
The patent replaces conventional mechanical mass estimation systems (weigh stations, air suspension pressure sensors) with an electric motor-based torque measurement system. The electric motor's torque sensor directly measures the torque required to move the vehicle, which is then used to calculate mass in real-time during motion, providing both high accuracy and real-time capability simultaneously.
2Device complexity
If mass estimation is performed using static methods only, then simplicity is maintained, but real-time mass updates during vehicle operation are not achieved
Solution Approach 1:
The patent transitions from static mass estimation to dynamic mass estimation by continuously measuring torque during vehicle operation. The system updates mass estimates in real-time as the vehicle moves, allowing the mass value to dynamically adapt to changing conditions such as cargo loading, passenger entry/exit, and fuel consumption, thereby achieving real-time mass updates without excessive complexity.
3Reliability
If braking systems are designed without real-time mass data, then system simplicity is maintained, but braking performance and stability control are affected by varying mass
Solution Approach 1:
The patent implements a feedback mechanism where the electric motor's torque measurement continuously provides real-time mass data to the vehicle control system. This feedback enables the braking system to automatically adjust its performance based on the current vehicle mass, ensuring optimal braking force and stability control without requiring complex manual interventions or additional sensor systems.
Data Source
AI summary
Connection and control concepts for real-time mass estimation of an electric vehicle are provided. The vehicle comprises a vehicle control module (VCM). Further, the vehicle comprises an inverter coupled to the VCM, and an electric motor coupled to the inverter. The electric motor is configured to measure the torque output from one or more wheels of the vehicle. The VCM is configured to receive the torque output measured by the electric motor and estimate mass of the vehicle based on the received torque output.