Dynamic Accelerator Response Curves for Regenerative Deceleration
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Solution Overview
Problem
Conventional vehicles with static or near-static accelerator response profiles face inefficiencies under various conditions, particularly in hybrid and electric vehicles, where traditional static response mechanisms fail to optimize performance and fuel economy.
Innovation Solution
The implementation of a dynamic accelerator response management system that remaps the prime mover's response based on the accelerator position and specific conditions such as deceleration events, speed thresholds, and obstacle detection, allowing for more efficient energy regeneration and improved vehicle control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a static or near-static accelerator response profile is used, then the system structure is simple and easy to control, but the vehicle operates inefficiently under various conditions especially in hybrid and electric vehicles
Solution Approach 1:
The patent implements dynamic remapping of the accelerator response curve based on vehicle operating conditions. The controller dynamically switches between a normal response curve and a deceleration response curve depending on whether a deceleration event is detected, allowing the system to adapt to varying operational requirements and improve efficiency without excessive complexity
Solution Approach 2:
The system changes the torque response parameters by switching between different response curves. The deceleration response curve modifies the torque values at different accelerator positions compared to the normal curve, optimizing energy regeneration during deceleration while maintaining simple control logic through parameter switching rather than complex real-time calculations
2Loss of energy
If the prime mover provides negative torque response over a wide accelerator range, then energy regeneration during deceleration is maximized, but the zero torque operating condition range is reduced
Solution Approach 1:
The deceleration response curve applies different torque characteristics to different regions of the accelerator range. It provides steeper negative torque response (greater slope magnitude) in the deceleration region while maintaining a reduced but sufficient zero torque range, optimizing energy recovery without completely eliminating the coasting operating condition
3Speed
If the first slope of negative torque response for deceleration curve is greater than normal curve, then deceleration performance is improved, but the transition smoothness may be affected
Solution Approach 1:
The system detects deceleration events in advance and proactively switches to the deceleration response curve before the operator fully engages the accelerator. This preliminary switching allows the steeper negative torque response to take effect smoothly, improving deceleration performance while maintaining stability through anticipatory control
Data Source
AI summary
A method includes receiving an indication regarding a deceleration event for a vehicle, remapping a response of a prime mover of the vehicle from following a first response curve to following a deceleration response curve in response to (i) the deceleration event and (ii) a speed of the vehicle being greater than a speed threshold, and activating an output of the prime mover to accelerate the vehicle at a relatively lesser amount of depression of an accelerator from a non-depressed state of the accelerator than prior to the deceleration event in response to the accelerator being engaged by an operator following the deceleration event.