Transmission Creep Control Intervention Logic for DCT Arbitration
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Solution Overview
Problem
Dual clutch transmissions (DCTs) and automated manual transmissions (AMTs) face challenges in ensuring consistent creep control and preventing unintended torque applications due to transient signal errors and electrical noise, which can lead to unexpected arbitration results and threshold acceleration events.
Innovation Solution
A controller with creep control intervention logic that monitors and arbitrates torque commands from multiple modules, ensuring the creep controller dominates during creep maneuvers, suppressing torque when the brake pedal is applied, and limiting acceleration and speed to prevent threshold events, thereby acting as an independent auditing mechanism for the arbitration process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple control modules generate torque commands during creep maneuver, then control functionality is enhanced, but transient signal errors and electrical noise can cause unexpected arbitration results
Solution Approach 1:
The patent introduces an intermediary auditing mechanism that monitors torque commands from multiple control modules during creep maneuvers. This intermediary layer checks for transient errors and electrical noise before arbitration, ensuring that only valid commands influence the final torque application. The mechanism acts as a filter between the multiple control modules and the arbitration process, preventing erroneous signals from causing unexpected results.
Solution Approach 2:
The patent implements a feedback mechanism where the controller continuously monitors the outputs of multiple control modules during creep maneuvers. When transient signal errors or electrical noise are detected, the system provides feedback to suppress or correct erroneous torque commands. This feedback loop ensures that the arbitration process receives only validated commands, maintaining reliability while preserving the enhanced control functionality of multiple modules.
2Ease of operation
If creep torque is applied during idle, then vehicle creep function is achieved, but unintended torque application can occur due to signal errors
Solution Approach 1:
The patent applies preliminary action by validating torque commands before they are applied to the input clutch. The auditing mechanism checks control module outputs in advance of arbitration, identifying and suppressing potential erroneous commands that could cause unintended torque application. This preliminary validation ensures that only verified commands proceed to the creep control process, maintaining both ease of operation and reliability.
Solution Approach 2:
The patent implements preliminary anti-action by proactively suppressing torque commands that exhibit characteristics of transient errors or electrical noise. Before these erroneous commands can cause unintended vehicle movement, the auditing mechanism detects their abnormal patterns and applies counter-action by blocking or correcting them. This prevents the harmful effects of signal errors while preserving the normal creep function.
3Adaptability or versatility
If torque arbitration allows multiple control modules to operate, then control flexibility is improved, but threshold acceleration events may occur due to errant commands
Solution Approach 1:
The patent introduces an intermediary auditing mechanism that sits between multiple control modules and the torque arbitration process. This intermediary monitors all torque commands during creep maneuvers, identifying those that could lead to threshold acceleration events. By filtering out errant commands before arbitration, the system maintains the flexibility of multiple control modules while preventing harmful acceleration events.
Solution Approach 2:
The patent converts the potential harm of multiple control modules generating conflicting or erroneous commands into a benefit by using the auditing mechanism to detect and correct these errors. The presence of multiple modules creates more opportunities for error, but the auditing system uses these same multiple inputs to cross-validate commands and identify anomalies. This transforms the potential harm into improved reliability through error detection and correction.
Data Source
AI summary
A vehicle includes a brake pedal, engine, transmission, and controller. The transmission includes an input member and an input clutch responsive to position control signals. The controller has multiple control modules, each outputting a corresponding torque command. One module is a creep control module which outputs a calibrated creep torque. Intervention logic independently monitors the torque commands during a creep maneuver, with control actions executed when predetermined conditions are present. The torque command from the creep controller determines the position control signals of the input clutch during the creep maneuver, and creep torque is set to zero whenever the brake pedal is sufficiently applied. A transmission assembly includes the input member, input clutch, and controller. A method includes outputting torque commands from each control module, including the creep torque, monitoring the torque commands during the creep maneuver, and executing the control actions when the predetermined conditions are present.