Automated Powertrain Speed Monitoring Method
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Solution Overview
Problem
Automated drive trains face challenges in monitoring speed parameters to prevent material damage and safety-critical conditions due to excessive speeds, which often lead to unnecessary error elimination measures that compromise vehicle comfort.
Innovation Solution
A method that detects speed parameters exceeding a threshold for a predetermined period, initiating appropriate measures to reduce speed, such as torque reduction or gear shifting, to prevent damage and ensure safety without unnecessary interventions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If speed monitoring triggers error elimination measures immediately when threshold is exceeded, then safety is improved, but vehicle comfort deteriorates due to unnecessary interventions
Solution Approach 1:
The patent applies preliminary action by introducing a time threshold (first predetermined period of time) before triggering error elimination measures. The control device monitors whether the speed parameter exceeds the first threshold for this predetermined period before initiating any corrective action. This preliminary time-based filtering prevents immediate reaction to transient speed excursions, thereby avoiding unnecessary interventions that would compromise vehicle comfort while still ensuring safety through sustained threshold monitoring.
2Loss of time
If speed monitoring uses a fixed threshold without time consideration, then response time is improved, but measurement precision deteriorates due to transient false positives
Solution Approach 1:
The patent applies preliminary action by establishing a time threshold (first predetermined period of time) that must elapse before triggering error elimination measures. The control device monitors whether the speed parameter exceeds the first threshold for this entire predetermined period before initiating corrective action. This preliminary time-based verification filters out transient false positives while maintaining rapid response to genuine sustained overspeed conditions.
Solution Approach 2:
The patent applies dynamics by implementing a two-level threshold system with different time characteristics. The first threshold with the first predetermined period detects sustained overspeed conditions, while the second threshold with the second predetermined period (shorter than the first) provides a safety net for rapid response to critical conditions. This dynamic multi-threshold approach enables precise differentiation between transient fluctuations and genuine overspeed events.
Data Source
AI summary
Method for monitoring an automated powertrain (10) of a motor vehicle, in particular a passenger vehicle, comprising a drive motor (12), a friction clutch assembly (14) and a stepped transmission (16), wherein the friction clutch assembly (14) connects or disconnects the drive motor (12) from the stepped transmission (16), comprising the steps of: - detecting at least one speed parameter (40) of the powertrain (10); - checking (46) whether the speed parameter (40) is greater than a first threshold value n1 for a first predetermined time interval (Δt1); and - initiating (50) a measure in the powertrain (10) to reduce the speed parameter (40) if the speed parameter (40) is greater than the first threshold value (n1) for the first predetermined time interval (Δt1).