Hybrid Multi-Mode CVT Switching Between Hydraulic and Mechanical Drive
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Solution Overview
Problem
Current transmission systems face inefficiencies in transmission ratio variability and power output, with hydraulic transmissions offering flexibility but low efficiency, mechanical transmissions providing high efficiency but in stepped manner, and hydro-mechanical transmissions needing integration for adaptive performance.
Innovation Solution
A hybrid multi-mode switching continuously variable transmission system integrating hydraulic, hydro-mechanical, and mechanical transmissions by adjusting displacement ratios and clutch engagement, utilizing a planetary gear assembly with multiple clutches and brakes to achieve stepless speed change and efficient power output.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If hydraulic transmission is used to achieve flexible operation and stepless speed change, then adaptability is improved, but transmission efficiency deteriorates
Solution Approach 1:
The transmission system is segmented into distinct hydraulic transmission path and mechanical transmission path, allowing selective engagement of each path based on operating conditions. The clutch assembly divides power flow into separate channels that can be independently controlled.
Solution Approach 2:
The system dynamically switches between hydraulic transmission mode and mechanical transmission mode based on real-time operating conditions. The clutch control assembly adjusts engagement states to optimize transmission efficiency while maintaining operational flexibility.
2Loss of energy
If mechanical transmission is used to achieve high transmission efficiency, then transmission efficiency is improved, but speed change flexibility deteriorates
Solution Approach 1:
The transmission system incorporates universal components that serve multiple functions: the planetary gear assembly provides both mechanical gear transmission and hydraulic coupling functions; the clutch assembly enables both mechanical engagement and hydraulic disconnection. This multi-functionality allows the system to achieve high efficiency while maintaining speed change flexibility.
Solution Approach 2:
The hydraulic transmission assembly acts as an intermediary between the engine and mechanical transmission components, providing continuous variable transmission capability while the mechanical path handles high-efficiency power transmission. The clutch assembly mediates between these two paths, enabling seamless transitions.
3Loss of energy
If hydro-mechanical transmission is used to integrate advantages of both hydraulic and mechanical transmission, then transmission efficiency is improved, but system complexity increases
Solution Approach 1:
The system merges hydraulic transmission components and mechanical transmission components into a unified hydro-mechanical transmission system. The planetary gear assembly and hydraulic transmission assembly are combined such that they share common input and output connections, enabling integrated operation while maintaining component modularity.
Solution Approach 2:
The clutch assembly serves multiple functions: engaging/disengaging the hydraulic transmission path, engaging/disengaging the mechanical transmission path, and enabling direct coupling between input and output. This multi-functionality reduces the need for separate control mechanisms for each transmission path.
4Adaptability or versatility
If multiple transmission modes are integrated to adapt to different operating conditions, then adaptability is improved, but device complexity increases
Solution Approach 1:
The system dynamically adjusts transmission mode based on operating conditions through the clutch control assembly, which monitors engine speed, load, and vehicle speed to determine optimal engagement states. This dynamic adaptation enables the system to maintain high efficiency across varying operating conditions without requiring multiple fixed transmission systems.
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
The system enables compact, high-efficiency power transmission with real-time torque compensation, improving gear shifting quality and ride comfort by switching between different transmission modes, including hydraulic, hydro-mechanical, and mechanical modes, and facilitating energy recovery.
Implementation Method 1
a hydraulic transmission assembly (4), wherein the input component (2) is connected with the hydraulic transmission assembly (4)
Implementation Method 2
an output component, a clutch assembly, a brake, a hydraulic transmission assembly and a planetary gear assembly
Data Source
AI summary
A continuously variable transmission system for hybrid power multi-mode switching, includes an input component, an output component, a clutch assembly, a brake, a hydraulic transmission assembly and a planetary gear assembly, wherein the input component is connected with the hydraulic transmission assembly, the output component is connected with the planetary gear assembly, the clutch assembly connects the input component and the hydraulic transmission assembly to the planetary gear assembly respectively, and the brake and the clutch assembly provide a transmission ratio for continuous forwarding or backwarding continuously between the input component and the output component. The hydro-mechanical transmission is switched to mechanical transmission by increasing the displacement ratio of the hydraulic transmission assembly linearly or non-linearly.