Torque Transfer Control Using Pulse-Based Rotor Direction Detection
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Solution Overview
Problem
Existing torque transmission devices in motor vehicle drive trains face challenges in preventing damage to combustion engines due to incorrect rotor rotation direction, require additional sensors like resolvers, and have increased space and cost requirements.
Innovation Solution
A torque transmission device with a control system that outputs a pulse to the electric motor to determine rotor angle position without a resolver, using vibration dampers with energy storage elements to absorb and manage rotor movement, reducing the risk of engine damage and space requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a sensor or resolver is used to detect the rotor's angular position, then the detection accuracy is improved, but the device complexity and installation space increase
Solution Approach 1:
The patent removes the resolver sensor from the system and replaces it with a sensorless detection method that uses the electric motor's own phase voltages and currents to determine rotor position, thereby eliminating the additional component and reducing device complexity
Solution Approach 2:
The electric motor uses its own phase voltages and currents to detect rotor position without requiring an external sensor, making the system self-sufficient and eliminating the need for additional detection components
2Measurement precision
If a sensor or resolver is installed to detect rotor position, then the detection capability is improved, but the installation space increases
Solution Approach 1:
The resolver sensor is completely removed from the system architecture, eliminating the physical space it would occupy in the motor assembly and reducing overall installation space requirements
Solution Approach 2:
The electric motor's phase windings serve dual purposes: both for generating torque and for detecting rotor position through voltage and current measurements, eliminating the need for separate detection components that would require additional space
3Adaptability or versatility
If the rotor is coupled to an internal combustion engine, then the torque transmission function is improved, but the risk of engine damage from incorrect rotation direction increases
Solution Approach 1:
The control system performs preliminary detection of the rotor's rotation direction before allowing full power transmission to the engine, using phase voltage and current measurements to verify correct rotation direction and prevent engine damage
Solution Approach 2:
The control system continuously monitors phase voltages and currents to detect rotor rotation direction in real-time, providing feedback control that prevents incorrect rotation from damaging the connected internal combustion engine
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
Enables accurate detection of rotor position and rotation direction without additional sensors, reducing the risk of combustion engine damage and minimizing space and cost, while improving the overall efficiency and design of the torque transmission device.
Implementation Method 1
the voltage induced in the three phases of the electric motor and the corresponding back EMF are measured
Implementation Method 2
the damper output is rotatable relative to the damper input to a limited extent against the effect of energy storage elements
Implementation Method 3
a torque transmission device, particularly in a drive train of a motor vehicle, is proposed, comprising an electric motor with a stator and a rotor rotatable relative to the stator
Data Source
Figure 1
AI summary
The invention relates to a torque transfer device, in particular in a powertrain of a motor vehicle, comprising an electric motor having a stator and a rotor rotatable relative thereto, a control system which can output a current pulse to the electric motor, the current pulse effecting a rotary motion of the rotor in a first direction of rotation and through a first angle of rotation and thus effecting an induced voltage, which is received by the control system and by which the control system determines the direction of rotation and/or the rotary position of the rotor in relation to the stator, the rotor being connected to a torsional vibration damper comprising a damper input and a damper output, the damper output being rotatable in a limited manner in relation to the damper input, against the effect of energy storage elements, and the rotary motion of the rotor being able to bring about a relative rotation between the damper input and the damper output.