Automotive & EV Manufacturing Analytics: Transforming Factory Operations from Cell to Showroom
This shift to EVs and software-defined architectures has completely transformed the economics and physics behind car manufacturing in today’s world.
The modern auto factory finds itself under tremendous strain as it is supposed to be handling a wide variety of requirements like meeting strict safety standards, handling highly customized vehicles, and maintaining tight production deadlines while trying to reduce energy cost per unit.
To help them with this task, Tier 1 manufacturers and OEMs are employing powerful edge-to-cloud analytics based on four key pillars of vehicle manufacturing.
1. EV Battery Genealogy & Thermal Traceability
A small defect in an EV battery at any stage in the production process can cause failure in the field and thermal runaway months later. Managing the safety of batteries means embedding the entire, immutable genealogy of cells within a production run into the manufacturing execution system (MES).
Traceability of a battery involves the continuous linking of three data streams:
Materials and Process Genealogy: Tracing the lineage of raw materials batches, electrolyte fill volume, and the uniformity of electrode coating to the sub-micron level.
Formation and Charging/Discharging Telemetry: Ingesting telemetry from voltage, impedance, and thermal curves during the formation testing process to detect micro short circuits or capacity issues prior to assembling the packs.
Pack Level Thermal Safety Metrics: Creating a digital mapping of the cell placement within module and pack containers and thereby associating the cell serial numbers with VINs.
Field issues necessitate expensive recalls using traditional batch-level tracing. Cell-level genealogy enables narrowing of the recall to a particular lot or process variable and reduces costs significantly.
2. Mixed-Model Assembly Optimization
Typical automotive assembly lines today use mixed platforms whereby a line has internal combustion engine (ICE) models, hybrids, and pure battery electric vehicle (BEV) models moving on the same conveyor. This results in large variations in workload depending on the workstation in question. Fitting a heavy high voltage harness on an electric vehicle is entirely different from fitting it in an ICE chassis.
AI algorithms used in real time to optimize sequencing of mixed platforms include the following:
Smoothing of Workload: Evaluating option content (e.g., panoramic roof, premium sound system, battery pack drop-in) of consecutive chassis in order to avoid bottlenecks in the line and fatigue of operators.
Resequencing Through Buffer: Employing dynamic buffer in ASRS between Body Shop, Paint Shop and Final Assembly to change sequences in the line when there are any disturbances.
Just-in-Sequence: Coordinating sequences of the line with the corresponding component delivery system to ensure that sub-assemblies arrive at the correct stations when the respective chassis arrives there.
In this way, the plant is able to attain optimal line balance and line stops without losing customization.
3. Body-in-White (BIW) Weld Quality Analytics
The standard automotive chassis has several thousands of spot welds, laser seams, and structural adhesives that hold the structure together. However, with the modern high-speed robotically operated weld cells, traditional destructive testing and off-the-line inspections are not sufficient enough to ensure the structural integrity.
BIW quality analytics utilizes the multi-modal sensing at the edge for real-time evaluation of the weld integrity:
Acoustic Emission and Sensor Telemetry: With the help of the acoustic sensor and dynamic resistance monitor, it is possible to collect the acoustic signature, voltage drop, and tip force within the millisecond of nugget creation.
Computer Vision Inspection: High-resolution cameras will perform inspection of the seam geometry, gap alignment, and spatter formation right after the pass of the robotic torch.
Predictive Defect Classification: The machine learning models deployed on the edge will correlate acoustic data with process data in real-time and detect such defects as cold weld, expulsion, or porosity.
Detecting the structural defect at the moment of the welding allows automatic re-welding or correction on the line prior to entering into the paint shop.
4. Paint Shop Energy & Environmental Optimization
Paint shop operations account for up to 70% of the entire energy footprint in automotive assembly plants, where precise monitoring of environmental conditions, temperature and air flow management in the paint booths, as well as oven curing process control, is necessary to ensure high-quality paint finishes.
Industrial IoT systems provide a closed loop control system for energy optimization while maintaining the standards for paint finish quality:
Environment Control: Environmental sensors constantly monitor the conditions of temperature, dew point, and air flow speed in the spray booths, and adjust the settings of the HVAC dampers and air-handling systems to maintain the proper viscosity and atomization.
Cure Oven: Smart temperature sensors monitor body temperatures during the cure oven process and adjust burner zone settings to guarantee a complete paint curing process without the excessive use of natural gas and electricity.
Batches Color Grouping: Advanced AI algorithms group cars by paint color batches in the paint buffer to avoid purging solvent waste and save time changing colors.
Switching from static climate settings to dynamic sensors-driven climate control enables paint shops to minimize carbon footprint and operating costs while eliminating surface defects such as orange peel, cratering or solvent pop.
Building an Integrated Intelligence Layer
The true advantage of the automotive analytics process would be in tearing apart information silos that exist in each of these specific production steps. Integrating information about cell genealogy, body welding telemetry, paint shop environment, and final assembly sequencing provides plant management with a comprehensive view of the entire production process pipeline.
Utilizing specialized smart factory platforms, such as OEM Vehicle Manufacturing AI platform, is one way to overcome operational technology (OT) telemetry and enterprise manufacturing execution analytics. Once all the processes of tracking, RTLS positioning, and sensors work together, the power of predictive intelligence turns complicated factory production into a synchronized and highly resilient process.
As more and more automotive platforms become more electric and software-intensive, manufacturers who incorporate edge intelligence and predictive analytics within their enterprises will be leading in terms of quality, safety, and operational efficiency.