Hybrid Powertrain Layout for Mode Switching in Less Space

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Solution Overview

Problem

Hybrid powertrains in vehicles have complex structures that are inconvenient to arrange and install, occupying a large space.

Innovation Solution

A hybrid powertrain with a simple and compact structure, utilizing a conversion device, a first motor, and an engine that can switch between different driving modes through a clutch assembly and transmission piece, eliminating the need for a reversing gear and simplifying the structure.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If a hybrid powertrain uses a complex structure with multiple independent power transmission paths, then it can achieve multiple driving modes, but it occupies a large space and is inconvenient to install

Engineering Contradiction:

Improvedriving mode switching capabilityVSAvoidoccupied volume

Core Design Contradiction:

Adaptability or versatilityVSVolume of moving object

Solution Approach 1:

The patent merges the engine and first motor into a single power transmission system where both power sources connect to the same transmission piece through clutch assemblies. This consolidation eliminates the need for separate power transmission paths, reducing occupied volume while maintaining the ability to switch between engine-only, motor-only, and combined power modes.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The transmission piece serves multiple functions: it transmits power from the engine when the first clutch assembly is engaged, transmits power from the first motor when the second clutch assembly is engaged, and can receive power from both sources simultaneously. This multi-functionality allows mode switching without requiring separate dedicated transmission paths for each power source.

Inventive Principle:

Principle #6Universality (Multi-functionality)

2Adaptability or versatility

If a hybrid powertrain includes a reversing gear to change power transmission direction, then it can adapt to different driving conditions, but it increases structural complexity

Engineering Contradiction:

Improvepower transmission direction controlVSAvoidstructural complexity

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The patent uses dynamically engageable clutch assemblies instead of a fixed reversing gear mechanism. The first and second clutch assemblies can be selectively engaged or disengaged to change power transmission direction and mode. This dynamic control approach eliminates the need for complex mechanical reversing gears while maintaining adaptability to different driving conditions.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The transmission piece acts as an intermediary element that receives power from either the engine or the first motor and transmits it to the driving wheels. By using the clutch assemblies as mediators to control power flow direction, the system avoids the need for traditional reversing gears, simplifying the overall structure while maintaining operational flexibility.

Inventive Principle:

Principle #24Intermediary (Mediator)

Data Source

PatentUS12583308B2Hybrid powertrain and vehicle

Publication Date: 2026.03.24 BYD CO LTD

AI summary

A hybrid powertrain includes a conversion device, a first motor, and an engine. At least one of the first motor and the engine is configured to output power to a driving end through the conversion device. The engine is configured to output power to the first motor through the conversion device, to drive the first motor to generate electricity.