Dynamic Electric Vehicle Mass Calculation via Energy Conservation
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Solution Overview
Problem
Current methods for determining the mass of electric vehicles are either inconvenient, requiring specific weighing locations and high costs, or lack precision, especially when measuring in dynamic conditions.
Innovation Solution
A dynamic calculation method and device that uses real-time status data during an accelerating driving period, including time, speed, height, gravitational acceleration, and power, to calculate the vehicle's mass based on the Law of conservation of energy, allowing for precise mass determination without the need for restrictive weighing sites or high additional hardware.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If floor scale weighing method is used, then measurement precision is improved, but ease of operation deteriorates due to restricted weighing locations and static condition requirements
Solution Approach 1:
The patent replaces the mechanical floor scale weighing system with a dynamic calculation system that uses sensor data (acceleration, speed, power) and energy conservation principles to compute vehicle mass. This substitution eliminates the need for physical weighing scales and static measurement conditions, allowing mass measurement during normal vehicle operation.
Solution Approach 2:
The patent transitions from static weighing methods to dynamic mass calculation during vehicle acceleration. By measuring parameters during the vehicle's natural acceleration process and applying energy conservation laws, the system achieves accurate mass measurement without requiring the vehicle to be stationary on specialized weighing equipment.
2Ease of operation
If vehicle chassis deformation-based weighing method is used, then ease of operation is improved, but measurement precision deteriorates and device complexity increases
Solution Approach 1:
The patent replaces the mechanical deformation-based weighing system with a dynamic calculation approach using energy conservation. Instead of measuring chassis deformation and using pressure-deformation curves, the system calculates mass from power, speed, and acceleration data, improving precision while maintaining ease of operation.
Solution Approach 2:
The patent introduces energy conservation principles as an intermediary to relate measurable parameters (power, speed, acceleration) to vehicle mass. This intermediary approach allows indirect but accurate determination of mass without direct mechanical contact or specialized weighing equipment.
3Ease of operation
If height sensor is mounted on vehicle suspension, then ease of operation is improved, but device complexity and manufacturing cost increase
Solution Approach 1:
The patent makes existing vehicle sensors (accelerometers, speed sensors, power regulators) perform the additional function of mass measurement. By utilizing data already collected for vehicle control and monitoring purposes, the system eliminates the need for dedicated mass measurement hardware like height sensors on suspension systems.
Solution Approach 2:
The vehicle's own operational data (power output, speed, acceleration) serves the dual purpose of vehicle control and mass measurement. The system uses the vehicle's natural operation to generate measurement data, eliminating the need for external measurement equipment and reducing overall system complexity.
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
Enables quick, precise, and convenient measurement of electric vehicle mass in real-time, with low implementation costs and minimal additional hardware requirements, facilitating easy integration through software upgrades.
Implementation Method 1
battery (for example, a storage battery and a fuel cell, etc.)—a current—a power regulator—an electric motor—a power transmission system—driving a vehicle to travel
Implementation Method 2
acquiring status data of a vehicle to be measured during an accelerating driving period, the status data including time, speed, height, gravitational acceleration
Implementation Method 3
on the basis of the Law of conservation of energy, i.e., the total output work of a vehicle drive motor being equal to the sum of the total resistance work, the total potential energy change amount of the vehicle in height and the kinetic energy change amount of the vehicle
Data Source
AI summary
A dynamic calculation method and device of electric vehicle mass includes acquiring status data of a vehicle to be measured during an accelerating driving period, the status data including time, speed, height, gravitational acceleration, effective driving power and resistance power; according to the status data information, calculating the total output work, the total resistance work, the total potential energy change amount and the kinetic energy change amount of the vehicle to be measured during the accelerating driving period. Calculating, on the basis of the total output work of a vehicle drive motor being equal to the sum of the total resistance work, a total potential energy change amount of the vehicle in height and the kinetic energy change amount of the vehicle, the mass of the vehicle to be measured.