Dynamic Torque Control for Dead Pedal Elimination
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Solution Overview
Problem
Existing methods struggle to avoid the 'dead pedal' feel and provide smooth wheel torque progression when the relationship between driver demand wheel torque input and actual wheel torque is static, leading to inconsistent vehicle acceleration and deceleration.
Innovation Solution
Dynamically adjusting the relationship between mapped driver demand wheel torque input and requested driver demand wheel torque as a function of road load and minimum wheel torque, with adjustable breakpoints to optimize torque progression.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a static relationship between driver demand wheel torque input and actual wheel torque is used, then the control system is simple, but the vehicle acceleration and deceleration become inconsistent and dead pedal feel occurs
Solution Approach 1:
The patent applies dynamics by transitioning from a static torque relationship to a dynamic one where the relationship between driver demand wheel torque input and actual wheel torque changes based on vehicle operating conditions. The system dynamically adjusts torque progression curves according to vehicle speed, load conditions, and accelerator pedal position to eliminate dead pedal feel and ensure smooth torque progression throughout the operating range.
Solution Approach 2:
The patent implements parameter changes by modifying multiple torque-related parameters including torque progression curves, acceleration profiles, and deceleration profiles based on vehicle operating conditions. The system changes torque demand parameters dynamically according to vehicle speed, load conditions, and pedal position to achieve consistent acceleration and deceleration characteristics.
2Reliability
If breakpoints in torque relationship are fixed, then the control logic is simple, but dead pedal feel cannot be avoided
Solution Approach 1:
The patent makes the torque relationship dynamic by adjusting breakpoints based on vehicle operating conditions. The system dynamically determines breakpoint positions in the torque progression curves according to vehicle speed, load conditions, and accelerator pedal position, allowing smooth torque delivery across all operating ranges while eliminating dead pedal feel through condition-dependent breakpoint adjustment.
3Productivity
If torque progression is optimized for all conditions, then vehicle performance is consistent, but the control system becomes complex
Solution Approach 1:
The patent optimizes vehicle acceleration performance by dynamically changing torque-related parameters including progression curves, acceleration profiles, and deceleration profiles based on vehicle operating conditions. The system adjusts these parameters according to vehicle speed, load conditions, and pedal position to achieve consistent high-performance acceleration and deceleration across all operating ranges.
Solution Approach 2:
The patent implements feedback mechanisms by continuously monitoring vehicle operating conditions such as vehicle speed, load conditions, and accelerator pedal position, and using this information to dynamically adjust torque progression curves and breakpoints. The system incorporates feedback loops that adjust torque demand in real-time based on actual vehicle response and operating conditions to maintain optimal performance.
Data Source
AI summary
Methods and systems are provided for adjusting driver demand wheel torque of a vehicle. The driver demand wheel torque may be adjusted as a function of accelerator pedal position. In particular, at low accelerator pedal positions, a lead-in region of an accelerator pedal position to driver demand wheel torque relationship is adjustable responsive to vehicle operation conditions so that “dead pedal” feel may be avoided.