Dual-Motor Work Vehicle Reverse Drive With Planetary Gear Control
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Solution Overview
Problem
Existing work vehicles inefficiently utilize motive power from the second motor for reverse travel, as the first motor's power is not effectively canceled or stopped, leading to higher loads and reduced efficiency.
Innovation Solution
A work vehicle configuration that includes a first motor, a second motor, a planetary gear mechanism, and a control device, where the control device manages the rotation of both motors to decelerate or stop the first motor during reverse travel, allowing the second motor's power to be efficiently used for reverse travel by canceling or not using the first motor's power, and a switchable transmission mechanism to optimize power output.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the first motor continues to output power during reverse travel, then the planetary gear mechanism must cancel out the first motor's power with the second motor's power, but this increases the load on the second motor and reduces efficiency
Solution Approach 1:
The control device decelerates or stops the first motor before or during the transition to reverse travel, preparing the power transmission system in advance. This preliminary action reduces the power that needs to be canceled by the second motor, thereby reducing the load on the second motor and improving power utilization efficiency during reverse travel.
Solution Approach 2:
The system dynamically adjusts the operation state of the first motor based on travel direction requirements. During reverse travel, the first motor is decelerated or stopped, changing its power output state from continuous to variable/zero, which optimizes the overall power distribution and reduces the burden on the second motor.
2Power
If the first motor is decelerated or stopped during reverse travel, then the load on the second motor is reduced, but this requires precise control coordination between both motors
Solution Approach 1:
The control device merges the control functions of both motors into a unified control system. By coordinating the control of the first and second motors through a single control device, the system manages the complex interactions between motor deceleration/stop and reverse power generation, simplifying the overall control architecture while achieving optimal power utilization.
Solution Approach 2:
The control device uses feedback from the planetary gear mechanism and motor states to continuously adjust the control signals to both motors. This feedback mechanism ensures that the first motor is decelerated or stopped at the appropriate timing and that the second motor generates the required reverse power, maintaining system stability despite the dynamic changes in motor operation states.
Data Source
Figure 1
Figure 2
Figure 3~4
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.