Steering Motor Torque Control via Temperature Feedback
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Solution Overview
Problem
Steering systems with electric motors face limitations due to rigidly specified motors and torque ranges, leading to increased temperature loads and potential damage when operating above nominal torque, especially in low-speed scenarios.
Innovation Solution
A method for operating electric motors in steering systems that allows temporary operation within an increased torque range between nominal and maximum torque, actively limiting torque based on temperature parameters to prevent overheating, using a computing unit to manage torque and ensure safe operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the electric motor is operated using increased torque between nominal torque and maximum torque, then the flexibility of the steering apparatus is improved, but the temperature load on the electric motor and components increases leading to potential damage
Solution Approach 1:
The patent applies dynamics by making the torque limit adaptive rather than fixed. The control device dynamically adjusts the maximum permissible torque based on real-time temperature measurements from sensors. When temperature is low, the motor can operate at higher torque levels; when temperature increases, the torque limit is reduced to prevent overheating. This dynamic adjustment resolves the contradiction by allowing flexibility when conditions permit while protecting against temperature-related damage when conditions deteriorate.
Solution Approach 2:
The patent implements feedback through temperature sensors that continuously monitor the thermal state of the electric motor and control circuit, and feed this information back to the control device. The control device uses this feedback to actively adjust the torque limit in real-time. This closed-loop feedback mechanism enables the system to operate at increased torque levels when safe, while automatically reducing torque when temperature thresholds are approached, thus resolving the contradiction between flexibility and temperature protection.
2Reliability
If active limitation of maximum torque based on temperature parameter is implemented, then damage to electric motor and components is prevented, but the flexibility of operation is reduced
Solution Approach 1:
The torque limitation is made dynamic rather than static. Instead of imposing a fixed reduced torque limit, the system continuously adapts the permissible torque level based on actual temperature conditions. When temperatures are within safe ranges, the full torque range is available; when temperatures approach critical levels, the limit is actively reduced. This dynamic approach maintains reliability by preventing damage while preserving flexibility during normal operating conditions.
Solution Approach 2:
The patent changes the parameter of torque limit based on temperature parameter measurements. The control device modifies the operational parameters (torque limits) in response to changes in temperature conditions. This parameter adaptation allows the system to maintain reliability through active temperature-based control while preserving operational flexibility when temperature conditions permit higher torque levels.
3Adaptability or versatility
If the electric motor operates at increased torque levels, then the steering apparatus can handle diverse driving situations, but heat distribution becomes uneven causing localized overheating
Solution Approach 1:
Multiple temperature sensors are strategically positioned to monitor different thermal zones within the electric motor and control circuit. This distributed sensing provides feedback on local temperature conditions, enabling the control device to detect uneven heat distribution and adjust torque limits accordingly. The feedback mechanism allows the system to handle diverse driving situations while preventing localized overheating by reducing torque when temperature gradients indicate problematic heat accumulation.
Solution Approach 2:
The system takes preliminary action by continuously monitoring temperature parameters and proactively adjusting torque limits before localized overheating causes damage. By detecting temperature trends and anticipating thermal issues, the control device can reduce torque levels in advance, preventing uneven heat distribution from leading to component failure while still allowing high-torque operation when thermal conditions are favorable.
Data Source
AI summary
A method operates a steering device which comprises at least one electric motor that can be operated with an increased torque lying between a nominal torque of the electric motor and a maximum torque of the electric motor over an entire basic setting range. In at least one operating state, a threshold torque of the electric motor is at least temporarily limited to a reduced torque, in particular in comparison to the maximum torque, at least depending on at least one temperature characteristic variable.