Vehicle Control System Torque Interruption Handling
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Solution Overview
Problem
Automatic mode selection in vehicles with manual transmissions is less reliable due to torque interruptions, leading to erroneous terrain detection and inappropriate control mode changes, which can affect vehicle composure and performance.
Innovation Solution
A control system that determines the driving surface automatically and temporarily suspends changes in control modes during torque interruptions, reducing the weight of unreliable terrain indicators to maintain appropriate subsystem control modes, thereby preventing inappropriate mode changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Extent of automation
If automatic mode selection is implemented based on terrain indicators, then the system can automatically adapt to different driving surfaces, but reliability deteriorates during torque interruptions causing erroneous terrain detection
Solution Approach 1:
The control algorithm preemptively counteracts the harmful effect of torque interruptions by detecting them and suspending terrain indicator updates before erroneous data can corrupt the terrain classification. This prevents the automatic mode selection system from making incorrect decisions during transient powertrain events.
Solution Approach 2:
The system dynamically adjusts its operation by switching between different modes: during normal operation it performs automatic terrain detection and mode selection, while during detected torque interruptions it suspends terrain indicator processing. This dynamic adaptation maintains reliability while preserving automation benefits.
2Speed
If terrain indicators are continuously updated during torque interruptions, then the system responds quickly to terrain changes, but measurement precision deteriorates due to erroneous terrain detection
Solution Approach 1:
The system preemptively prevents erroneous terrain detection by detecting torque interruptions and suspending terrain indicator updates before corrupted data can be processed. This maintains measurement precision by avoiding the incorporation of unreliable data during transient events.
3Adaptability or versatility
If control mode changes are allowed during torque interruptions, then the system maintains adaptability to terrain changes, but stability deteriorates due to inappropriate mode changes affecting vehicle composure
Solution Approach 1:
The control algorithm preemptively prevents inappropriate mode changes by detecting torque interruptions and suspending control mode transitions before they can occur. This maintains vehicle composure by avoiding mode changes that would be based on erroneous terrain detection during transient powertrain events.
Solution Approach 2:
The system dynamically controls mode changes by allowing them during stable operation to maintain adaptability, while suspending them during detected torque interruptions to maintain stability. This dynamic control strategy balances adaptability and stability based on operating conditions.
Data Source
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AI summary
Some embodiments of the present invention provide a motor vehicle control system for controlling a plurality of vehicle subsystems to operate in a plurality of subsystem control modes in dependence on a driving surface. The system is operable in an automatic control mode selection condition in which the system is configured to determine said driving surface automatically and to cause each of the plurality of vehicle subsystems to operate in a predetermined one of said plurality of subsystem control modes in dependence on the determined driving surface. The system may be configured to determine if an interruption in powertrain torque occurs and to, in dependence on the identification of a powertrain torque interruption event, temporarily suspend causing an automatic change to said predetermined one of said plurality of subsystem control modes in which each subsystem is operating..