Power Apparatus Collinear Diagram Inversion for Torque Control
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Solution Overview
Problem
Conventional power apparatuses for vehicles face challenges in controlling the differential rotation of left and right wheels, leading to potential rotating direction inversion of electric machines, which complicates control and requires intricate management of torque differences between electric machines and wheels.
Innovation Solution
The power apparatus incorporates a differential unit configuration with specific gear connections that maintain a collinear relationship between rotation elements, allowing for controlled torque distribution and preventing rotating direction inversion by adjusting the torques of the electric machines, thereby ensuring stable operation and miniaturization of the power sources.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the first rotary electric machine and the second rotary electric machine are connected to the outer rotation elements in the collinear diagram, then the torque distribution control is simplified, but the rotation speed difference between the electric machines becomes extremely great during vehicle revolution, causing rotating direction inversion
Solution Approach 1:
The patent inverts the conventional connection arrangement by connecting the rotary electric machines to inner rotation elements (carrier and sun gear) rather than outer elements (ring gears). This inversion changes the speed distribution characteristics while maintaining torque control capability, preventing the extreme speed difference that causes rotating direction inversion.
Solution Approach 2:
The patent changes the connection parameters of the power sources to different rotation elements within the differential unit. By connecting the first rotary electric machine to the carrier and the second to the sun gear (or vice versa), the speed ratios are adjusted to keep the speed difference between electric machines within a controllable range during differential operations.
2Power
If the rotary electric machines are connected to rotation elements with great speed difference, then the differential torque control is effective, but the control complexity increases due to rotating direction inversion
Solution Approach 1:
The patent inverts the connection configuration to prevent rotating direction inversion, thereby simplifying the control system. By connecting electric machines to the carrier and sun gear instead of ring gears, the system maintains effective torque distribution capability while avoiding the need for complex control algorithms to handle direction inversions.
3Device complexity
If the first carrier and second ring gear are integral, then the torque transfer path is simplified, but the rotation speed difference amplifies during differential operation
Solution Approach 1:
The patent inverts which elements are connected integrally. Instead of making the first carrier and second ring gear integral (conventional approach), it makes the first sun gear and second carrier integral, or the first ring gear and second sun gear integral. This inversion changes the speed relationship during differential operation, preventing excessive speed difference amplification while maintaining structural simplicity.
Data Source
AI summary
A collinear relationship is satisfied in which rotation speeds of first to third rotation elements and rotation speeds of fourth to sixth rotation elements are arranged respectively in this sequence on a single straight line in a collinear diagram. The first and fourth rotation elements are connected with first and second power sources respectively. The second and fifth rotation elements are connected with first and second driven units respectively. The second and sixth rotation elements are connected with each other by a first connecting mechanism in a way that rotating directions thereof are the same, and rotation speed of the former is greater than that of the later. The third and fifth rotation elements are connected with each other by a second connecting mechanism in a way that rotating directions thereof are the same, and rotation speed of the former is greater than that of the later.