Launch Torque Control Using Brake Pressure and Pedal Thresholds
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Solution Overview
Problem
Conventional vehicle torque control systems may limit powertrain torque based on torque converter speed, which can compromise high-performance vehicle launches and potentially damage driveline components when the brake and accelerator pedals are simultaneously applied.
Innovation Solution
A launch control system that monitors accelerator pedal position and brake pressure, temporarily limiting torque output when both exceed calibrated thresholds to prevent driveline damage, and increasing torque to a maximum calibrated value when either threshold is met.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If powertrain torque is limited based on torque converter speed in conventional systems, then driveline component damage is prevented, but vehicle launch performance is compromised
Solution Approach 1:
The torque limitation strategy dynamically adapts based on driver input conditions. The system transitions from conventional torque converter speed-based limitation to a conditional limitation approach that monitors accelerator pedal position and brake pressure, allowing torque limits to be applied only when specific high-risk conditions are detected, thereby optimizing both protection and performance
Solution Approach 2:
The system changes the control parameters from torque converter speed alone to a combination of accelerator pedal position, brake pressure, and their rates of change. This parameter transformation enables more precise identification of dangerous conditions while allowing full torque delivery during normal high-performance launch scenarios
2Productivity
If torque output is increased to maximum calibrated value quickly, then vehicle launch performance is improved, but driveline component damage risk increases
Solution Approach 1:
The system performs preliminary monitoring of accelerator pedal position and brake pressure conditions before allowing maximum torque delivery. By detecting the combination of high accelerator pedal position and high brake pressure in advance, the system can prevent dangerous torque application that would cause driveline damage, while still permitting full performance when conditions are safe
Solution Approach 2:
The control system continuously monitors accelerator pedal position, brake pressure, and their rates of change, using this feedback to dynamically adjust torque limits. This closed-loop feedback mechanism enables real-time adjustment of torque output based on actual driver inputs, preventing damage while maintaining performance
Data Source
AI summary
A launch control system for a vehicle includes a control system configured to, in response to detecting a launch control request, determine whether an accelerator pedal position and a brake pressure are greater than respective calibrated thresholds, when the accelerator pedal position and the brake pressure are both greater than the respective calibrated thresholds, temporarily limit a torque output of a torque generating system to a limited calibrated value to mitigate or prevent potential damage to a driveline system, and while temporarily limiting the torque output of the torque generating system to the limited calibrated value, when at least one of the accelerator pedal position and the brake pressure falls below its respective calibrated threshold, increase the torque output of the torque generating system to a maximum calibrated value.