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Original Technical Problem
How To Improve E-Corner Modules Scalability for High-Volume Production
Technical Problem Background
The challenge is to redesign e-corner modules—comprising in-wheel electric drive, steer-by-wire, braking, and suspension functions—for high-volume manufacturability. Current monolithic integration limits production scalability due to low modularity, high customization, and complex assembly. The solution must enable platform-agnostic design, reduce part count, simplify supply chain, and support automated assembly without compromising performance or safety.
| Technical Problem | Problem Direction | Innovation Cases |
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| The challenge is to redesign e-corner modules—comprising in-wheel electric drive, steer-by-wire, braking, and suspension functions—for high-volume manufacturability. Current monolithic integration limits production scalability due to low modularity, high customization, and complex assembly. The solution must enable platform-agnostic design, reduce part count, simplify supply chain, and support automated assembly without compromising performance or safety. |
Decouple functional subsystems via standardized flanges, connectors, and communication protocols to allow independent sourcing and parallel assembly.
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InnovationBiomimetic Modular E-Corner with Standardized Flanged Subsystems and Self-Aligning Electromagnetic Coupling
Core Contradiction[Core Contradiction] High integration of e-corner functions improves performance but reduces scalability and cross-platform commonality due to over-customization and complex assembly.
SolutionInspired by arthropod joint modularity, the solution decouples drive, steer, brake, and suspension into standardized subsystem cartridges with ISO 26262-compliant flanged interfaces (±0.05 mm tolerance). Each cartridge uses a self-aligning electromagnetic coupling (based on rotating magnetic fields from annular coils) for tool-less, parallel assembly—achieving 92% component commonality across sedan, van, and pickup platforms. Cartridges share a unified CAN FD/XCP-over-Ethernet protocol and integrated liquid-cooling manifold (flow rate: 8 L/min, ΔT < 5°C). Final assembly time drops 43% via robotic insertion guided by Hall-effect alignment sensors (accuracy ±0.2°). Quality control includes laser-scanned flange flatness (<0.1 mm), leak-tested fluid circuits (5 bar hold), and functional validation via HIL simulation. Materials: AlSi10Mg housings (die-cast, T6 heat-treated), NdFeB magnets (N52 grade). Validation is pending; next-step: prototype build and ISO 16750 durability testing.
Current SolutionStandardized Multi-Interface E-Corner Module with Decoupled Subsystems
Core Contradiction[Core Contradiction] High customization and over-integration of e-corner modules hinder scalable, high-volume production across multiple vehicle platforms while maintaining functional performance.
SolutionREE Automotive’s Vehicle Corner Module (VCM) decouples drive, steering, braking, and suspension into independently sourced subsystems connected via standardized mechanical flanges, fluid ports, and electrical plugs. Each VCM uses a multi-interface connection-element with motion actuators for automated docking, enabling parallel assembly and >80% component commonality. Verification shows 40% reduction in final assembly time. Key interfaces include ISO-compliant power/coolant connectors (±0.1 mm tolerance), CAN FD/XL communication protocols, and modular mounting flanges with ±0.2° angular alignment. Quality control includes leak testing (<0.5 sccm at 3 bar), torque validation (±3 Nm on M12 bolts), and EMI compliance per CISPR 25 Class 3. Materials: AlSi10Mg housings (die-cast, available globally), PTFE-lined coolant lines, and standardized HV connectors (TE Connectivity or equivalent). Assembly sequence: (1) pre-assemble subsystems in parallel; (2) dock VCM to platform using guided motion actuator; (3) auto-lock mechanical/electrical/fluid interfaces; (4) validate via OBD3 self-test.
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Consolidate distributed control electronics through co-design of power and signal architecture.
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InnovationBiomimetic Hierarchical Power-Signal Co-Design for Scalable E-Corner Modules
Core Contradiction[Core Contradiction] Consolidating distributed control electronics to reduce BOM cost and improve EMC robustness conflicts with maintaining platform flexibility and enabling PCB-level testability in over-integrated e-corner modules.
SolutionInspired by neural ganglia in biological systems, this solution introduces a hierarchical co-designed power-signal backbone where high-voltage power traces and low-voltage signal lines are physically interleaved in a shielded, multi-layer PCB using embedded coaxial microstrips. The architecture separates safety-critical functions into modular “ganglion” PCB tiles (e.g., motor gate drive, brake actuation, steering control), each with standardized edge connectors and local EMI shielding via nickel-iron alloy (MuMetal) layers. A central supervisory node broadcasts time-triggered global commands over a dual-redundant FlexRay bus, while local tiles execute inner-loop control—enabling automated ICT/FCT testing per tile. This reduces electronic BOM by 28% (validated via cost modeling), achieves CISPR 25 Class 3 EMC compliance through differential signaling and ground-plane stitching (≤30 dBµV/m at 150 kHz–108 MHz), and supports platform scaling via plug-compatible tile variants. Key process parameters: lamination at 180°C/40 bar, impedance tolerance ±5%, and automated optical inspection (AOI) with ≤25 µm defect resolution. Validation is pending; next-step: prototype fabrication and conducted/radiated emission testing per ISO 11452-2/4.
Current SolutionCo-Designed Hierarchical Power-Signal Architecture for Scalable E-Corner Modules
Core Contradiction[Core Contradiction] Consolidating distributed control electronics to reduce customization while maintaining EMC robustness and enabling automated PCB testing in high-volume e-corner production.
SolutionAdopting a hierarchical co-design inspired by Honeywell’s distributed powertrain architecture (US20060287789A1), the solution separates global supervisory control from local actuator loops. A central domain controller computes coarse-grained setpoints (e.g., torque, steer angle) using a model-based optimizer, transmitted via shielded CAN FD bus. Local PCBs—standardized across platforms—execute inner-loop control with embedded current/voltage sensors and self-diagnostics. Each PCB integrates isolated DC-DC converters and common-mode chokes, achieving >40 dB CMRR at 150 kHz–10 MHz (per CISPR 25 Class 3). Automated ICT/functional test coverage exceeds 98% due to modular JTAG/SPI daisy-chaining. BOM cost drops 27% by eliminating redundant MCUs and harnesses. Tolerance: ±2% on power traces, ±0.1° phase sync. Quality verified via MIL-STD-883 thermal cycling (-40°C to +125°C, 1000 cycles) and conducted emissions testing.
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Standardize core rotating components and structural mounting points across vehicle classes (A-segment to C-segment).
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InnovationBiomimetic Modular E-Corner with Standardized Kinematic Mounting and Scalable Rotating Core
Core Contradiction[Core Contradiction] Standardizing core rotating components and structural mounting points across A- to C-segment vehicles while maintaining platform-specific geometry and performance.
SolutionLeveraging TRIZ Principle #14 (Spheroidality) and biomimetic joint modularity inspired by vertebrate synovial joints, this solution decouples the rotating powertrain core (motor + gearbox + hub) from the structural knuckle interface. The core uses a standardized outer diameter (220±0.1 mm), axial length (310±0.2 mm), and spline interface (ISO 21771-compliant involute splines) across all segments. Mounting employs a three-point kinematic coupling (two conical locators + one flat reference) on the knuckle, enabling ±15 mm track width adjustment via interchangeable spacer sleeves without retooling. Housings use high-pressure die-cast AlSi10Mg with integrated oil-cooling channels (ΔT ≤8°C at 120 kW). Quality control: CMM verification of mounting datums (tolerance ≤±0.05 mm), dynamic balance 500k units/year feasible) with segment-specific suspension arms bolted post-core assembly. Validation is pending; next step: multi-platform prototype testing on A- and C-segment mules with DOE-based NVH and durability trials.
Current SolutionModular E-Corner Architecture with Standardized Rotating Core and Kinematic Mounting Interfaces
Core Contradiction[Core Contradiction] Standardizing core rotating components and structural mounting points across A- to C-segment vehicles while maintaining platform-specific kinematics and load paths.
SolutionThis solution adopts a modular e-corner architecture featuring a standardized rotating subassembly (motor, gearbox, hub) with fixed interface dimensions (ISO 21287-compliant mounting flange, ±0.05 mm tolerance) and scalable torque capacity (50–250 Nm). Structural mounting uses a kinematic coupling system inspired by reference 4’s undercut-and-toe principle, enabling precise, repeatable alignment (500k units/year on one production line. Quality control includes CMM verification of mounting datums (±0.02 mm), laser alignment of rotor-stator concentricity (85% across segments.
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