Hybrid Drive Electric Machine Sensor Defect Handling
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Solution Overview
Problem
Existing hybrid drive devices face challenges in preventing damage to the electric machine due to excessive temperature, particularly when the temperature sensor is defective, leading to potential overheating and damage.
Innovation Solution
Implementing an emergency operating mode that restricts the electric machine's operation to limited power, torque, and time if the temperature sensor is defective, with parameters determined by environmental variables to prevent overheating, allowing continued operation with reduced power and torque requirements for limited periods.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the electric machine operates with high power and torque, then productivity and performance are improved, but temperature increases rapidly causing potential damage to the electric machine
Solution Approach 1:
The control unit performs preliminary diagnosis of the temperature sensor to detect defects before they cause catastrophic failure. By proactively identifying sensor issues and switching to emergency operating mode, the system prevents uncontrolled temperature rise that would occur without reliable sensor feedback, thus protecting the electric machine while maintaining limited operational capability.
Solution Approach 2:
The system dynamically adjusts operating parameters based on sensor status. In normal mode, full power and torque are permitted. When sensor defect is detected, the system transitions to emergency mode with dynamically limited power, torque, and duration parameters, allowing the electric machine to operate safely under constrained conditions rather than complete shutdown.
2Reliability
If the temperature sensor is defective, then measurement reliability deteriorates, but the electric machine can still operate with limited parameters in emergency mode
Solution Approach 1:
The system prepares compensatory measures in advance by implementing emergency operating mode parameters before complete failure occurs. When sensor defect is detected, pre-defined limited power, torque, and duration parameters are activated, cushioning the impact of measurement unreliability and preventing catastrophic operation without temperature monitoring.
Solution Approach 2:
The control unit creates a simplified operational model for emergency mode that copies essential safety constraints from normal operation but with reduced parameters. This emergency operation profile allows the system to function with degraded sensing capability by applying conservative limits that would be safe even without accurate temperature feedback.
3Duration of action of stationary object
If the electric machine operates continuously at maximum temperature, then duration of action is extended, but damage to windings and components occurs
Solution Approach 1:
The system implements periodic monitoring and diagnosis of the temperature sensor to detect defects early. By continuously assessing sensor health and transitioning to emergency mode upon defect detection, the system prevents prolonged operation at unsafe temperatures that would compromise component integrity, thus protecting against damage while maintaining operational continuity under limited conditions.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Effectively prevents damage to the electric machine by maintaining safe temperature levels and enabling continued operation with reduced power requirements, even when the temperature sensor is defective, ensuring the hybrid drive device can still function in low-power or short-duration applications.
Implementation Method 1
The temperature sensor is in particular in a heat transfer connection to particularly critical areas of the electrical machine
Implementation Method 2
A large amount of heat accumulates in the electric machine, in particular when a high torque is provided in the case of motor operation of the electric machine or a high electric power in the case of generator operation
Data Source
Figure 1
AI summary
The invention relates to a method for operating a hybrid drive device (2) which has an internal combustion engine (3) and an electric machine (4) which can be or is operatively connected to the internal combustion engine (3) and can be operated as a generator, wherein in a normal operating mode a temperature of the electric machine (4) is determined by means of a temperature sensor (14), and operation of the electric machine (4) is permitted only if the temperature is lower than a predefined maximum temperature. There is provision here that in the event of a defect in the temperature sensor (14) an emergency operating mode is carried out in which operation of the electric machine (4) is permitted only with limited power, limited torque and/or over a limited time period. The invention further relates to a hybrid drive device (2).