Automatic Transmission Target Switching with Dynamic Consolidation Time
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Solution Overview
Problem
Conventional automatic transmission control methods for vehicles with discrete ratios, electric, hybrid, or thermal systems fail to minimize the frequency of state changes in the kinematic chain, leading to performance degradation, increased service interruptions, and reduced reactivity due to inadequate consideration of the impact of state changes on overall transmission and vehicle performance.
Innovation Solution
A method that determines the consolidation time for substituting a state based on the cause of the current target's elimination, using an adjustment parameter to optimize reactivity or sequencing of target substitutions, allowing for targeted authorization of state changes to improve vehicle performance by considering the specific reasons for state change interruptions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the target state is changed during the execution of a state in the drivetrain, then the transmission can respond to new driver requests or braking changes, but the execution time of operations is lengthened and performance is lost
Solution Approach 1:
The control method determines the cause of target elimination in advance and applies different consolidation times based on pre-defined criteria. By preparing the consolidation time strategy beforehand based on the elimination cause, the system can switch targets more efficiently without extending execution time unnecessarily.
Solution Approach 2:
The invention changes the consolidation time parameter dynamically based on the cause of target elimination. When the elimination cause indicates a priority change (such as safety-critical braking requests), the consolidation time is reduced or waived, allowing immediate target switching. This parameter adaptation resolves the contradiction by making the system both responsive and time-efficient.
2Speed
If the consolidation time for target substitution is reduced to improve responsiveness, then the vehicle reacts faster to new requests, but the quality of state execution degrades and clunking noises or jolts appear
Solution Approach 1:
The control method dynamically adjusts the consolidation time parameter based on the cause of target elimination. For non-critical changes, full consolidation time is applied to ensure smooth execution. For critical changes (safety, performance), the consolidation time is reduced or eliminated. This conditional parameter change resolves the contradiction by adapting the strictness of execution to the urgency of the situation.
Solution Approach 2:
The invention makes the consolidation time dynamic rather than fixed. The system transitions from a static consolidation time approach to a dynamic one that adapts to the elimination cause. This allows the system to be strict when needed for quality and lenient when needed for responsiveness, resolving the contradiction between speed and reliability.
3Adaptability or versatility
If conventional control methods allow target changes during state execution, then the transmission can adapt to performance requirements, but the frequency of target changes increases and overall performance is degraded
Solution Approach 1:
The control method incorporates feedback by continuously monitoring the cause of target elimination and using this information to determine the appropriate consolidation time. This feedback loop prevents unnecessary target changes by evaluating whether a change is truly warranted before initiating the substitution process, thereby reducing the frequency of changes and improving overall performance.
Solution Approach 2:
The invention changes the consolidation time parameter based on the elimination cause to control the frequency of target changes. By applying longer consolidation times for non-critical changes and shorter times for critical changes, the system optimizes the balance between adaptability and performance, preventing excessive target substitutions that would degrade productivity.
Data Source
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AI summary
Method for controlling the target of a vehicle automatic transmission during the implementation thereby of a state of the drivetrain of the vehicle pre-consolidated as target (OPT_DLS_CS), characterized in that the period of consolidation (DLS_CGE_TMR_THD) necessary in order to allow the substitution of a state (OPT_DLS), which has become optimal for the drivetrain subsequent to the start of the current implementation, for a target (OPT_DLS_CS) currently being implemented is determined as a function of the cause of elimination (OPT_DLS_CS_FORB_VAL) of the target (OPT_DLS_CS) currently being implemented.