Dynamic Throttle Filtering for Rough-Surface Torque Oscillation
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Solution Overview
Problem
Vehicle drivability and passenger comfort are compromised due to undesirable oscillating torque demand when driving on rough surfaces, leading to driveline oscillation and wrap, which affects the perception of vehicle controllability and quality.
Innovation Solution
An automated throttle filtering system that dynamically filters torque inputs based on sensed driving surface roughness, using processor-controlled systems to receive throttle pedal inputs, determine filtered torque demand values, and transmit these to powertrain components to minimize oscillating torque demand.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the vehicle operates on a rough driving surface, then the vehicle can traverse difficult terrain, but undesirable oscillating torque demand is introduced causing driveline oscillation and wrap
Solution Approach 1:
A filter is introduced as an intermediary component between the throttle pedal input and the powertrain system. This filter processes the torque demand signal to remove oscillations caused by rough terrain, allowing the vehicle to traverse difficult surfaces while preventing harmful driveline oscillations from reaching the powertrain components
Solution Approach 2:
The system uses sensors already present in the vehicle (throttle pedal position sensor, wheel speed sensors, suspension sensors) to detect rough terrain conditions and automatically adjust torque demand filtering. The system serves itself by utilizing existing vehicle components to detect and respond to rough terrain without requiring additional external intervention
2Ease of operation
If the operator's foot inadvertently moves the throttle pedal on rough surfaces, then the vehicle responds to the input, but undesirable drivability and passenger comfort effects result
Solution Approach 1:
The system continuously monitors throttle pedal position, wheel speed, and suspension movement to detect inadvertent pedal movements caused by rough terrain. When such movements are detected, the filter automatically adjusts the torque demand signal to compensate for the inadvertent input, maintaining normal drivability while eliminating uncomfortable oscillations
Solution Approach 2:
The filtering characteristics of the system are dynamically adjusted based on detected driving conditions. When rough terrain is detected, the filter becomes more aggressive in removing oscillations. When smooth terrain is detected, the filter reduces its intervention to maintain natural throttle response, allowing the system to adapt its behavior to current operating conditions
3Quantity of substance
If vehicles with increased masses are used, then cargo carrying capacity is improved, but the vehicle becomes more prone to driveline oscillation and wrap
Solution Approach 1:
The system dynamically changes the filtering parameters of the torque demand signal based on vehicle mass and detected roughness conditions. Heavier vehicles experiencing more oscillations receive stronger filtering with different time constants and threshold values compared to lighter vehicles, allowing the system to optimize performance for each vehicle configuration and loading condition
Data Source
AI summary
Dynamic throttle pedal filtering of a vehicle is provided. An automated throttle filtering system may be included in the vehicle that may operate to filter throttle pedal input based on detection of a rough driving surface. The rough driving surface detection may be based on an evaluation of wheel speed signals or an indication of traction loss. The throttle pedal input may be filtered corresponding to rough driving surface magnitude values determined based on the wheel speed signals. For example, filtered torque demand values may be determined based on the rough driving surface magnitude values and included in a torque demand request communicated to the vehicle's powertrain system. The resulting torque output may modulate an undesirable oscillating torque demand that may be generated in relation to operation of the vehicle on a rough driving surface.