Dual-Motor Work Vehicle Reverse Drive via Planetary Gear Control
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Solution Overview
Problem
Existing work vehicles inefficiently utilize motive power from the second motor for reverse travel, leading to suboptimal performance and increased load requirements.
Innovation Solution
A control device manages the rotation of the first and second motors to efficiently use motive power for forward and reverse travel by decelerating or stopping the first motor when necessary, and utilizing the second motor's power through a planetary gear mechanism to generate combined motive power for efficient reverse travel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the first motor continues to operate at full power during reverse travel, then work output is maintained, but the second motor must generate excessive power to cancel out the first motor's power, reducing overall efficiency
Solution Approach 1:
The system dynamically adjusts the operating state of the first motor based on travel direction. During reverse travel, the first motor is controlled to decelerate or stop, while during forward travel it operates at full power. This dynamic state change allows the second motor's power to be efficiently utilized for reverse travel without wasting energy canceling out continuous first motor output.
Solution Approach 2:
The patent extracts the work function from the first motor during reverse travel by decelerating or stopping it. This separation allows the second motor to independently provide reverse travel power through the planetary gear mechanism without the inefficiency of power cancellation, thus taking out the unnecessary power consumption during reverse operation.
2Device complexity
If the second motor operates alone for reverse travel without the planetary gear mechanism combining powers, then the system is simpler, but the motive power from the second motor cannot be efficiently utilized
Solution Approach 1:
The planetary gear mechanism serves multiple functions: it combines power during forward travel to provide high torque output, and it enables efficient power utilization during reverse travel by allowing the second motor's power to be the primary input. This multi-functionality resolves the contradiction by making the same mechanism beneficial for both forward and reverse operations.
3Use of energy by moving object
If the first motor is decelerated or stopped during reverse travel, then the second motor's power is efficiently used, but the transmission mechanism must handle the transition smoothly
Solution Approach 1:
The control device monitors the travel direction and automatically adjusts the first motor's rotation state accordingly. When reverse travel is detected, the control device commands the first motor to decelerate or stop, and controls the second motor to provide appropriate power. This feedback-based control ensures smooth transitions and maintains operational ease while improving power efficiency.
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
Enhances the efficiency of motive power utilization for reverse travel by reducing load requirements, allowing the second motor's power to be used effectively, and includes a cooling system to prevent overheating of inverters and motors.
Implementation Method 1
a planetary gear mechanism configured to generate combined motive power by combining motive power received from the first motor with motive power received from the second motor
Implementation Method 2
a cooling device configured to circulate and supply a refrigerant to the first motor, the second motor, the first inverter, and the second inverter
Data Source
AI summary
A control device 50 controls rotation of a first motor 21 and controls rotation of a second motor 22. In response to receiving a forward travel command from an operating device 51, the control device 50 controls rotation of the second motor 22 in such a manner that combined motive power output by a planetary gear mechanism 41 is used as forward motive power. In response to receiving a reverse travel command from the operating device 51, the control device 50 controls rotation of the first motor 21 in such a manner that the first motor 21 decelerates or stops, and controls rotation of the second motor 22 in such a manner that motive power output by the planetary gear mechanism 41 is used as reverse motive power.