Electric Drive Vehicle Simulation for Performance Testing
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional methods for measuring the running performance of electric drive vehicles require expensive test facilities and lengthy preparation procedures, often necessitating actual vehicle operation even when not necessary.
Innovation Solution
An electric drive vehicle system comprising a power generator, power converters, an electric motor, and a power consuming device, with control modes that allow for simulated operation and power consumption adjustment, enabling performance measurement without a test facility and reducing test duration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional test procedures using dynamometers or chassis dynamometers are employed to measure running performance, then measurement accuracy is improved, but test facility costs and test period are increased
Solution Approach 1:
The patent creates a virtual copy of the actual vehicle operation through simulation. Instead of physically driving the vehicle on a test course or dynamometer, the system simulates the operating conditions and calculates performance parameters mathematically, achieving accurate measurement without physical test facilities
Solution Approach 2:
The patent replaces the mechanical test system (dynamometers, chassis rollers, physical test courses) with an electronic calculation system. The running performance is determined through computational methods using vehicle parameters and simulated operating conditions, eliminating the need for mechanical measurement infrastructure
2Reliability
If actual vehicle driving is performed to measure running performance, then realistic operating conditions are achieved, but preparatory work and test duration are prolonged
Solution Approach 1:
The patent performs preliminary calculations and simulations before actual testing would be needed. By pre-establishing the calculation framework and using simulated operating conditions, the system eliminates the need for time-consuming preparatory work such as vehicle setup, driver training, and test course preparation
Solution Approach 2:
The system creates virtual representations of realistic operating conditions through simulation parameters, replicating the effects of actual driving without requiring physical vehicle operation. This maintains the reliability of measuring performance under realistic conditions while eliminating time losses
3Measurement precision
If motor rotation and vehicle driving are performed to impose load on the engine for characteristic measurement, then accurate engine output characteristics are obtained, but test facility requirements and costs increase
Solution Approach 1:
The patent extracts the essential measurement function from the complex test facility system. Instead of using dynamometers or chassis rollers to impose and measure load, the system calculates engine output characteristics directly from vehicle parameters and simulated operating conditions, separating the measurement objective from the complex measurement apparatus
Solution Approach 2:
The patent replaces the mechanical load imposition system with an electronic calculation system. Engine output characteristics are determined through computational analysis of vehicle operating parameters rather than through physical load application, eliminating the need for complex test facilities
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 solution eliminates the need for costly test facilities and shortens the test period, improving efficiency by allowing performance measurement at rest and automatic adjustment of engine and motor accelerations, while ensuring compatibility and adaptability to varying conditions.
Implementation Method 1
a power generator (2) coupled to the engine (1)
Implementation Method 2
a first power converter (4) connected with the power generator (2), for converting the AC power generated by the power generator (2) to the corresponding DC power
Implementation Method 3
a second power converter (6) connected with the first power converter (4), for converting the DC power to the corresponding AC power
Implementation Method 4
an electric motor (8) connected with the second power converter (6); and wheels (12) driven by the electric motor (8)
Data Source
AI summary
An electric drive vehicle having a power generator coupled to an engine, a first power converter connected with the power generator for converting the AC power generated by the power generator to DC power, a second power converter connected with the first power converter, for converting the DC power to AC power, a power consuming device for consuming the DC power, connected to a DC circuit between the first and second power converters, an electric motor connected with the second power converter, and at least one wheel driven by the electric motor, wherein the vehicle has a first control mode for controlling the output of the electric motor and a second control mode for controlling the power consumed by the power consuming device, and the second control mode performs such control that the operations of the second power converter and the electric motor in the first control mode are simulated.