Dual-Motor Wheel Speed Control for Steering Without Separate Brakes
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Solution Overview
Problem
Existing moving bodies, such as electric vehicles, require complex configurations and separate devices for traveling, stopping, and turning, which increases size, cost, and complexity, while also compromising control robustness.
Innovation Solution
A moving body with a simplified configuration featuring a control device that controls two dynamo-electric machines on left and right drive wheels to manage rotation speeds, allowing for traveling, stopping, and turning operations without separate steering and braking devices, by setting and maintaining specific average and differential rotation speeds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If separate steering and braking devices are used, then traveling, stopping, and turning operations can be achieved, but the structure becomes complex and size increases
Solution Approach 1:
The patent combines steering and braking functions with the drive wheels by equipping each drive wheel with an independent dynamo-electric machine. This integration eliminates the need for separate steering and braking devices, reducing structural complexity while maintaining full operational capability for traveling, stopping, and turning
Solution Approach 2:
The dynamo-electric machines serve multiple functions: they provide driving force for traveling, generate braking force through regenerative braking, and create differential rotation for steering. This multi-functionality allows a single component to replace what would traditionally require separate dedicated devices
2Ease of operation
If separate steering and braking devices are used, then traveling, stopping, and turning operations can be achieved, but cost increases
Solution Approach 1:
By merging steering and braking functions into the drive wheel system with independent dynamo-electric machines, the patent eliminates the need to manufacture and install separate steering and braking devices, thereby reducing overall manufacturing cost
Solution Approach 2:
The multi-functional dynamo-electric machines replace multiple single-function devices, reducing the total bill of materials and assembly costs associated with separate steering and braking systems
3Ease of operation
If separate steering and braking devices are used, then traveling, stopping, and turning operations can be achieved, but control robustness decreases
Solution Approach 1:
The control device continuously monitors rotation speeds of individual drive wheels and adjusts dynamo-electric machine operations in real-time to maintain desired vehicle behavior, enhancing control robustness through active feedback control
Solution Approach 2:
The system dynamically adjusts the operation of each dynamo-electric machine based on real-time conditions, enabling adaptive control that maintains robustness across varying operating conditions such as different speeds, loads, and road surfaces
4Stability of the object's composition
If basic rotation speed and differential rotation speed are set and controlled, then stable straight travel and turning operations are achieved, but control complexity increases
Solution Approach 1:
The control is segmented into two independent control loops: one for basic rotation speed (affecting both wheels equally for straight travel) and one for differential rotation speed (affecting the speed difference for turning). This segmentation simplifies the control strategy by decoupling the two functions
Solution Approach 2:
The control system adjusts operational parameters (rotation speeds) of the dynamo-electric machines to achieve desired vehicle behavior. By changing the basic rotation speed parameter for straight travel and the differential rotation speed parameter for turning, the system achieves stable operations through parameter control rather than complex mechanical mechanisms
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
This approach reduces the size and cost of the moving body while enhancing control robustness and stability, enabling stable straight travel and turning operations.
Implementation Method 1
a first dynamo-electric machine that imparts torque to the first drive wheel; a second dynamo-electric machine that imparts torque to the second drive wheel
Data Source
AI summary
This vehicle comprises a first dynamo-electric machine that imparts torque to a first drive wheel, a second dynamo-electric machine that applies torque to a second drive wheel, a rotation speed sensor that acquires a first rotation speed of the first drive wheel, a rotation speed sensor that acquires a second rotation speed of the second drive wheel, and a control device. The control device includes a basic setting unit that sets a basic rotation speed, a differential setting unit that sets a differential rotation speed, and an action control unit that controls the operation of the first dynamo-electric machine and the second dynamo-electric machine so that an average value of the first rotation speed and the second rotation speed becomes the basic rotation speed, and a difference between the first rotation speed and the second rotation speed reaches the differential rotation speed.