Two-Motor Four-Wheel Hybrid Transmission With Multi-Gear Shifting
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Solution Overview
Problem
Existing four-wheel drive hybrid systems require three motors, leading to high costs and complexity, while lacking a gear shifting mechanism and unable to implement pure electric four-wheel drive.
Innovation Solution
A four-wheel drive four-gear hybrid power transmission system with a front wheel drive system and a rear wheel drive system, utilizing only two motors, which includes an engine with four gear positions and a rear wheel drive system with a reduction gear, enabling gear shifting without power interruption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a P1+P3+P4 three-motor hybrid architecture is used to achieve four-wheel drive, then the vehicle can achieve four-wheel drive capability and good power performance, but the system complexity and manufacturing cost significantly increase
Solution Approach 1:
The patent extracts the rear wheel drive function from the traditional three-motor architecture by removing motor P3 and using motor P4 directly connected to the rear axle. This simplifies the system while maintaining four-wheel drive capability, directly resolving the contradiction between four-wheel drive capability and system complexity
Solution Approach 2:
The patent makes motor P4 serve dual functions: it can drive the rear wheels directly for four-wheel drive operation, and can also function as a generator during regenerative braking. This multi-functionality reduces the need for separate components, thereby reducing system complexity while maintaining four-wheel drive capability
2Adaptability or versatility
If a P1+P3+P4 three-motor hybrid architecture is used to achieve four-wheel drive, then the vehicle can achieve four-wheel drive capability, but the manufacturing cost significantly increases
Solution Approach 1:
The patent removes motor P3 from the traditional three-motor architecture, reducing the number of expensive motor components from three to two. This directly lowers manufacturing costs while maintaining four-wheel drive capability through the simplified P1+P4 architecture
Solution Approach 2:
The patent merges the functions of motor P3 and motor P4 into a single motor P4 configuration, where motor P4 handles both front and rear wheel drive requirements through differential mechanical connections. This consolidation reduces component count and manufacturing cost while preserving four-wheel drive functionality
3Adaptability or versatility
If a series-parallel hybrid system with dual motors is used, then the system achieves high flexibility and wide applicable scenes, but the system lacks a gear shifting mechanism and cannot shift gears
Solution Approach 1:
The patent introduces a gear shifting mechanism with multiple gear positions (first, second, third, and fourth gear positions) that dynamically adjusts the transmission ratio between the engine and wheels. This enables the system to adapt to different driving conditions and speeds, resolving the contradiction between flexibility and the lack of gear shifting capability
4Use of energy by moving object
If the engine speed is decoupled to improve fuel economy and power performance, then the fuel economy improves, but the engine torque is not decoupled from the wheel end leading to high difficulty in start-up control
Solution Approach 1:
The patent introduces motor P1 as an intermediary component between the engine and the wheel end. Motor P1 can independently control the wheel end torque while the engine operates at optimal speed for fuel economy. This mediator resolves the contradiction by decoupling engine speed from wheel end torque, enabling both improved fuel economy and easier start-up control
Data Source
AI summary
Provided in the present disclosure is a four-wheel drive multi-gear hybrid power transmission system, including a first drive system and a second drive system that drive two pairs of wheels of a vehicle respectively, where the first drive system includes an engine, a first motor, an input shaft, a first motor shaft, a first output shaft, a first synchronizer, a second synchronizer, and a plurality of gear sets, and the first motor has two gear positions; and the second drive system is an electric drive axle. According to the present disclosure, one motor is reduced, which significantly lowers costs, and multi-gear shifting can be implemented, which improves the fuel consumption economy of the engine and can cope with various working conditions.