Test Bench RDE Simulation With Corrected Reference Values
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Solution Overview
Problem
Current test bench methods using standardized test cycles fail to accurately predict a vehicle's compliance with real-world pollutant emission limits under the Real Driving Emissions (RDE) test procedure, leading to unpredictable development outcomes and potential costly rework for manufacturers.
Innovation Solution
A method and test bench configuration that includes a detection unit to determine deviations in simulation values from reference values, with a correction unit adjusting these values to minimize deviations, ensuring accurate simulation and compliance with RDE test procedures by continuously correcting simulation speeds and positions based on tolerance thresholds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If standardized test cycles are used on test benches, then emission verification can be performed systematically, but the test conditions do not reflect real-world driving conditions leading to inaccurate compliance prediction
Solution Approach 1:
The patent applies preliminary action by pre-processing reference values from actual RDE test drives and storing them in a reference database before simulation. These reference values (speed, position, time, environmental conditions) are prepared in advance to guide the simulation unit in reproducing realistic driving scenarios, ensuring that the test bench simulation accurately reflects real-world conditions that will be encountered during actual RDE testing
Solution Approach 2:
The patent uses copying by creating a virtual replica of real-world driving conditions through simulation. The simulation unit copies actual RDE test data (reference values) to generate simulated driving scenarios that mirror real-world conditions. This allows the test bench to evaluate vehicle emissions under conditions that accurately represent actual road testing, bridging the gap between controlled test bench environments and unpredictable real-world driving
2Reliability
If RDE test procedure is used with real road testing, then real-world emission compliance can be verified, but the test is not reproducible due to random influences
Solution Approach 1:
The patent implements feedback by continuously comparing simulated values generated during test bench simulation with corresponding reference values from actual RDE test drives. The simulation unit uses this comparison to adjust and optimize its output, ensuring that simulated emissions data accurately reflects real-world performance. This feedback mechanism allows reproducible test bench evaluation while maintaining alignment with variable real-world conditions
Solution Approach 2:
The patent applies parameter changes by dynamically adjusting simulation parameters (speed, position, time, environmental conditions) based on reference values from actual RDE testing. The simulation unit modifies these parameters to reproduce the variability of real-world driving conditions while maintaining a structured test framework. This allows the system to capture the unpredictability of real roads within a controlled, reproducible simulation environment
3Reliability
If test scenarios are created to cover all operating states, then comprehensive verification is achieved, but test time and cost increase significantly
Solution Approach 1:
The patent applies universality by creating a single, unified simulation framework that can handle all possible operating states and driving conditions through one integrated system. The simulation unit processes diverse reference values (speed, position, time, environmental parameters) through a common architecture, allowing comprehensive verification of vehicle emissions across all operating conditions without requiring multiple separate test scenarios or procedures
Solution Approach 2:
The patent uses preliminary action by pre-processing and organizing reference values from actual RDE test drives into a structured reference database before simulation begins. This preparation includes categorizing data by driving conditions, vehicle operating states, and environmental parameters. During simulation, the system efficiently retrieves and applies relevant pre-processed data, avoiding the need to create and execute multiple separate test scenarios for different operating conditions
Data Source
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AI summary
The aim of the invention is to reduce the deviation (x) of a comparison simulation value from a comparison reference value (ref) in the performance of a test run on a test stand (1) with a test object (2), in which test run a number of simulation values (sim) is simulated by a simulation unit (4) by means of a number of specified reference values (ref). This aim is achieved, according to the invention, in that a corrected reference value (ref') is determined, starting from a selected reference value (ref) from the number of reference values, the corrected reference value (ref') is specified to the simulation unit (4), instead of the selected reference value (ref), for the simulation of a corrected simulation value (sim'), and the at least one target value (T) is determined using the corrected simulation value (sim').