BEV Simulated Shift Control for Conventional Gear-Change Feel
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Solution Overview
Problem
Battery electric vehicles (BEVs) lack a traditional driving/shifting experience due to their single or dual-speed electric drive modules, which can be monotonous for drivers.
Innovation Solution
A simulated shift system for BEVs that uses sensors to monitor driver input and a controller to adjust the electric drive module's drive torque output, simulating transmission shift operations of a conventional multi-speed automatic transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single or dual-speed electric drive module is used in a BEV, then the propulsion system is simplified and efficient, but the driving experience becomes monotonous and boring due to lack of traditional shifting operations
Solution Approach 1:
The patent creates a simulated shifting experience by copying the torque characteristics of conventional multi-speed transmissions. The controller modulates electric motor torque output to replicate the torque dips and shifts that occur during traditional transmission gear changes, providing drivers with a familiar driving experience without requiring actual mechanical shifting components.
Solution Approach 2:
The patent replaces the mechanical transmission shifting system with an electronic control system that modulates motor torque. Instead of using physical gears and shafts to achieve shifting effects, the system uses electronic torque management to create simulated shift sensations, thereby simplifying the mechanical structure while maintaining the desired driving experience.
2Productivity
If conventional BEV propulsion control systems provide constant torque output across varying speeds, then propulsion efficiency is maintained, but the driving experience lacks engagement and traditional shifting characteristics
Solution Approach 1:
The patent implements periodic torque modulation to simulate the rhythmic nature of traditional gear shifting. The controller creates periodic variations in torque output that correspond to simulated shift events, maintaining overall propulsion efficiency while providing the periodic sensory feedback that drivers associate with engaging shifting operations.
Solution Approach 2:
The patent dynamically changes torque parameters to create simulated shifting effects. The controller adjusts torque magnitude and timing parameters to replicate the characteristic torque profile of conventional transmissions during gear changes, allowing the system to maintain efficiency while providing varied and engaging driving characteristics through parameter modulation.
Data Source
AI summary
A simulated shift system for a battery electric vehicle (BEV) includes a set of sensors configured to monitor a set of parameters indicative of driver input by a driver of the BEV and a controller configured to control an electric drive module (EDM) of the BEV, the EDM comprising a gear system connected to an electric motor and being configured to output drive torque to a driveline of the BEV, receive the monitored set of parameters, and, based on the monitored set of parameters, selectively control the EDM to adjust drive torque output therefrom to simulate transmission shift operations of a predetermined conventional automotive automatic transmission having four or more speeds.