Vehicle Drive Unit Startup Using Reverse Motor Rotation
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Solution Overview
Problem
Existing methods for initializing electric motor systems in vehicles, such as electric bikes, are inefficient and can delay torque provision, as they require complex initialization processes during normal operation, which disrupts the vehicle's operation and takes significant time.
Innovation Solution
A method that initializes the electric motor system by actuating the motor in a reverse direction of rotation at a predefined start current during system startup, allowing for rapid initialization of the motor sensor system and software, independent of normal operation, and enabling full torque provision in a short time without affecting the vehicle's operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the electric motor is initialized during normal operation, then the motor sensor system and software can be calibrated, but torque provision is delayed and vehicle operation is disrupted
Solution Approach 1:
The patent applies preliminary action by performing the motor initialization, sensor system calibration, and software setup during a system start phase before normal operation begins. This allows the motor to be fully prepared and ready for immediate torque provision without interrupting the driving operation, as the initialization occurs in advance during the startup sequence.
2Power
If the electric motor is actuated at high current during startup, then torque is generated quickly, but torque transmission may affect vehicle operation or standstill
Solution Approach 1:
The patent applies dynamics by using a freewheel mechanism that dynamically couples or decouples the drive train from the wheels based on operational state. During startup, the freewheel allows the electric motor to be actuated at high current for rapid torque generation while preventing this torque from being transmitted to the wheels, thus avoiding disruption to vehicle operation or standstill. The freewheel dynamically adapts the power transmission path to match the startup 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
Enables a simple and time-efficient system startup, allowing for immediate initialization of the motor system and torque provision, preventing torque transmission during startup, thus allowing the method to be performed without disrupting the vehicle's operation or standstill.
Implementation Method 1
the electric motor is actuated at a predefined start current such that the electric motor rotates in a reverse direction of rotation
Data Source
AI summary
A method for operating a drive unit of a vehicle operable by muscle power and/or motor power and comprising an electric motor and a control unit includes, in response to a system start of the drive unit. actuating the electric motor at a start current such that the electric motor rotates in a reverse direction of rotation.