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Original Technical Problem
How To Improve Regenerative Braking Blending Serviceability Without Weakening Performance
Technical Problem Background
The challenge involves redesigning the regenerative braking blending system—comprising brake pedal simulator, hydraulic modulator, motor inverter interface, and blending control unit—to improve serviceability (diagnostics, part replacement, calibration) without compromising real-time performance. The system must support standard workshop tools, enable fault isolation at sub-module level, and retain seamless torque blending during operation, all within automotive safety and cost constraints.
| Technical Problem | Problem Direction | Innovation Cases |
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| The challenge involves redesigning the regenerative braking blending system—comprising brake pedal simulator, hydraulic modulator, motor inverter interface, and blending control unit—to improve serviceability (diagnostics, part replacement, calibration) without compromising real-time performance. The system must support standard workshop tools, enable fault isolation at sub-module level, and retain seamless torque blending during operation, all within automotive safety and cost constraints. |
Decouple the human-machine interface (pedal feel) subsystem from the core blending controller to enable independent replacement.
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InnovationModular Fluidic Pedal Feel Cartridge with Electromechanical Decoupling Interface
Core Contradiction[Core Contradiction] The pedal feel simulator must be tightly integrated with the blending controller for consistent braking performance, yet this integration impedes rapid replacement and recalibration during service.
SolutionLeveraging TRIZ Principle #1 (Segmentation) and biomimetic fluidic logic, we introduce a self-contained pedal feel cartridge that interfaces with the core blending controller via a standardized electromechanical coupling. The cartridge integrates a dual-chamber hydraulic simulator with a magnetorheological (MR) fluid damper and embedded strain gauge, sealed in an ISO 26262-compliant aluminum housing (material: EN AW-6082-T6). It connects to the master cylinder through quick-disconnect hydraulic fittings ( 0.99). Validation is pending; next-step: HiL simulation with dSPACE SCALEXIO to verify jerk 87%.
Current SolutionModular Hydraulic Pedal Feel Simulator with Decoupled Electromagnetic Valve Control
Core Contradiction[Core Contradiction] The need to enable rapid replacement and recalibration of the pedal feel subsystem without disrupting the core regenerative blending controller or degrading braking performance (smoothness, response, efficiency).
SolutionThis solution implements a modular pedal feel simulator where the mechanical spring-piston assembly is physically and hydraulically isolated from the core blending ECU via a dedicated, serviceable cartridge interface. A two-part piston design (Bosch EP3623968B1) allows the simulator to be replaced in controllable two-way electromagnetic valve (e.g., Bosch CSV type) integrated into the simulator housing, which adjusts hydraulic pressure differentially across piston chambers. The valve is controlled by a local microcontroller that communicates target force profiles over CAN FD, decoupling HMI logic from the main brake controller. Performance metrics: pedal travel consistency ±1.5%, jerk 87%. Quality control includes leak testing at 150 bar (±2%), valve hysteresis <3%, and spring preload tolerance ±0.5 N. Calibration uses closed-loop feedback from a master cylinder pressure sensor (accuracy ±0.5 bar) to match target pedal curves within 5% RMS error.
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Separate operational and service functions in the software architecture using conditional execution modes.
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InnovationConditional Execution Mode Architecture with Dual-State Blending Control Unit
Core Contradiction[Core Contradiction] Enhancing serviceability (diagnostics, component replacement) of regenerative braking blending systems requires software access and hardware modularity, which risks degrading real-time braking performance (smoothness, response, efficiency) due to shared resources and execution paths.
SolutionLeveraging TRIZ Principle #1 (Segmentation) and first-principles separation of concerns, we implement a dual-state ECU architecture with strictly isolated operational and service execution modes. During driving (Operational Mode), the high-integrity real-time kernel executes torque blending at 2 kHz using dedicated hardware threads, ensuring jerk 87%. Upon ignition-off or diagnostic trigger (Service Mode), the system transitions via a verified finite state machine to deactivate performance-critical tasks and activate a sandboxed diagnostic layer that exposes standardized UDS services over CAN FD. This mode enables component validation (e.g., pedal simulator, pressure sensor) using generic workshop tools, supports hot-swap of modular hydraulic cartridges with self-calibrating EEPROMs, and performs fault tracing via timestamped event logs. Quality control includes ISO 26262 ASIL-D compliance, mode transition latency <50 ms, and hardware-in-the-loop validation of blending continuity across mode switches. Validation is pending; next-step: dSPACE SCALEXIO HIL testing with fault injection.
Current SolutionConditional Execution Mode Architecture for Serviceable Regenerative Braking Blending Systems
Core Contradiction[Core Contradiction] Enhancing serviceability (diagnostics, maintenance, component replacement) of regenerative braking blending systems requires software access and reconfiguration, which risks degrading real-time braking performance (smoothness, response, efficiency) if not isolated from operational functions.
SolutionThis solution implements a conditional execution mode architecture in the brake ECU software, as described in patent [1], where distinct operating states—“on,” “software diagnosis,” “software parameterization,” and “operation under emergency conditions”—are strictly separated via finite state machines. During vehicle operation (“on” state), only performance-critical blending algorithms execute with deterministic timing (85%. In workshop mode, activation of the “software diagnosis” state (via off-board CAN/OBD-II interface) disables real-time control loops and enables comprehensive sensor/actuator validation using generic tools. Component replacement triggers “software parameterization” for automatic calibration. Quality control includes ISO 14229-compliant UDS diagnostics, with acceptance criteria: diagnostic response time <100 ms, parameterization error <1%, and seamless state transition verified via HIL testing per ISO 26262 ASIL C. This separation ensures driving-mode integrity while enabling technician-friendly servicing.
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Apply spatial separation by encapsulating wear-prone or failure-prone components into field-replaceable units.
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InnovationSelf-Calibrating, Tool-Free Field-Replaceable Blending Actuator Cartridge with Biomimetic Latching and Embedded Diagnostics
Core Contradiction[Core Contradiction] Enhancing serviceability of regenerative braking blending systems requires modular, field-replaceable components, but tight integration is needed to maintain sub-100ms response latency and smooth torque blending.
SolutionWe apply TRIZ Principle #1 (Segmentation) and biomimetic spatial separation by encapsulating the electro-hydraulic modulator, pedal simulator, and local controller into a sealed, self-calibrating FRU cartridge. The cartridge uses a tool-free, pivotable latch with G-shaped tension spring (inspired by IBM server FRUs) for secure, vibration-resistant docking without fasteners. Embedded micro-diagnostic sensors (pressure, position, temperature) auto-characterize performance during first 3 braking cycles post-installation, eliminating dyno calibration. The cartridge interfaces via standardized ISO 11783-compliant CAN FD and hydraulic quick-connects with ±0.05mm alignment tolerance. Quality control includes leak testing (<0.1 mL/min at 200 bar), connector insertion force (15–25 N), and latency validation (<80 ms). Materials: PPS housing (heat/chemical resistant), FKM seals, and nickel-plated brass hydraulic fittings—commercially available. Validation status: pending; next step is HiL simulation with AUTOSAR-compliant ECU stack.
Current SolutionTool-Free Latched Field-Replaceable Blending Control Unit for Regenerative Braking Systems
Core Contradiction[Core Contradiction] Enhancing serviceability through modular replacement of wear-prone electro-hydraulic components conflicts with maintaining sub-100 ms braking response and seamless torque blending due to integration complexity.
SolutionEncapsulate the brake pedal simulator, hydraulic modulator, and blending ECU into a field-replaceable unit (FRU) using a pivotable latch mechanism with integrated spring preload (per IBM’s patent). The FRU docks into a vehicle-mounted mid-plane with zero-backlash electrical connectors, ensuring fixed mechanical/electrical coupling without tools. Positive pressure from a G-shaped tension spring maintains connector integrity under vibration, eliminating post-replacement dyno calibration. Operational steps: (1) unlatch via flip-lever, (2) slide out FRU, (3) insert new unit until latched—auto-engaging CAN FD and power interfaces. Tolerances: connector alignment ±0.1 mm, latch preload force 45±5 N. Testing: MIL-STD-810G vibration, ISO 15031 diagnostics validation. Achieves <80 ms latency, jerk <1.8 m/s³, and 50% downtime reduction vs. monolithic systems.
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