Electric Drivetrain Deceleration Control to Prevent Wheel Spinning
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Solution Overview
Problem
Electrically driven working machines experience high inertia in the drivetrain during deceleration, leading to undesirable wheel spinning due to the moment of inertia of electric motors, especially when braking forces are insufficient to counteract driving forces during external speed decelerations.
Innovation Solution
Implement a situation detection system using various sensors to anticipate external speed decelerations and actively reverse the power direction of the travel motor to generate additional braking torque, preventing wheel spinning by reducing the motor's rotational speed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If electric motors are used for travel drive and work drive, then the working machine can achieve high speed and power, but the machine exhibits high inertia during deceleration causing wheel spinning
Solution Approach 1:
The control system detects in advance when external deceleration will occur (such as when the bucket encounters resistance in the material pile) and preemptively applies counter-torque to the electric motor to reduce its rotational speed before wheel spinning can occur. This preliminary action prevents the instability rather than reacting after it occurs.
Solution Approach 2:
The system applies an opposing torque to the electric motor's rotation in anticipation of deceleration events. By detecting the situation in advance and supplying power in the opposite direction to the motor's operating direction, the system creates a counterbalancing force that prevents the motor's inertia from causing wheel spinning.
2Power
If the travel motor operates at high speed under full load, then the machine achieves high power output, but the motor's rotational energy exceeds the braking force available during deceleration
Solution Approach 1:
The control system dynamically changes the motor's operational parameters by supplying power in the opposite direction to reduce rotational speed. This parameter change (reversing power direction) allows the motor to transition from high-speed full-load operation to a controlled deceleration state, matching the braking force requirements.
Solution Approach 2:
The control system continuously monitors the operating conditions and detects when external deceleration is occurring or imminent. Based on this feedback, the system adjusts the motor's power output in real-time by applying counter-torque, creating a closed-loop control that balances the motor's rotational energy with the available braking force.
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
Prevents wheel spinning and undesirable digging-in by effectively managing deceleration through anticipatory control of the travel motor, ensuring stable operation during external speed reductions.
Implementation Method 1
supplying the travel motor with a power in a direction opposite to an operating direction of the travel motor in order to reduce a rotational speed of the travel motor
Implementation Method 2
it is detected in advance using a situation detection that the braking force acting on the vehicle wheels as a result of the speed deceleration is lower than the driving force acting on the vehicle wheels
Data Source
AI summary
A method for operating an electric drivetrain of a working machine is provided wherein the drivetrain comprises a work drive with an electric work motor and a travel drive with an electric travel motor and vehicle wheels, wherein the working machine experiences a speed deceleration from the outside that may result in a braking force acting on the vehicle wheels lower than a driving force acting on the vehicle wheels due to a moment of inertia of the travel motor. The method includes supplying the travel motor with a power in a direction opposite to an operating direction of the travel motor in order to reduce a rotational speed of the travel motor, if it is detected in advance using a situation detection that the braking force acting on the vehicle wheels as a result of the speed deceleration is lower than the driving force acting on the vehicle wheels.