Dual Clutch Electric Four Wheel Drive Torque Vectoring
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Solution Overview
Problem
The existing electric four wheel drive systems of the dual clutch type are cumbersome due to their complex structure, high weight, and increased cost, which negatively impacts fuel efficiency and size, primarily due to the inclusion of a hydraulic pressure generator, pump housing, hydraulic pump, motor, valve housing, and hydraulic valves.
Innovation Solution
A simplified configuration for the hydraulic pressure generator that operates dual clutches, utilizing a motor housing-mounted hydraulic valve assembly connected to a regenerative braking system's hydraulic pressure generator, which supplies operating hydraulic pressure to dual clutches via hydraulic lines, allowing for torque vectoring without the need for a hydraulic booster, and a controller to manage torque distribution based on vehicle conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a hydraulic pressure generator with pump housing, hydraulic pump, motor, valve housing, and hydraulic valves is used to operate dual clutches for torque vectoring, then torque distribution control is achieved, but system weight, cost, and complexity increase
Solution Approach 1:
The patent combines the hydraulic valve assembly with the motor housing, integrating multiple functions into a single structure. The motor housing serves as both the motor enclosure and the hydraulic valve assembly mounting structure, eliminating the need for separate valve housing and reducing overall system complexity while maintaining torque distribution control capability
Solution Approach 2:
The motor housing is designed to serve multiple functions: it encloses the motor and simultaneously provides mounting structure for the hydraulic valve assembly. This multi-functional design reduces the number of separate components needed for operating the dual clutches, thereby reducing system complexity without compromising torque vectoring functionality
2Adaptability or versatility
If a complete hydraulic pressure generator system is installed for dual clutch operation, then torque vectoring is enabled, but overall system weight increases
Solution Approach 1:
The hydraulic valve assembly is merged with the motor housing into a single integrated structure. This eliminates the weight of separate valve housing and mounting structures, reducing overall system weight while maintaining the capability to control dual clutches for torque vectoring
Solution Approach 2:
The patent extracts and eliminates unnecessary components from the traditional hydraulic pressure generator system. By removing the separate valve housing and integrating only the essential valve assembly into the motor housing, the system achieves weight reduction while preserving torque vectoring functionality
3Stress or pressure
If multiple separate components (pump housing, hydraulic pump, motor, valve housing, hydraulic valves) are used for hydraulic pressure generation, then sufficient hydraulic pressure is provided for dual clutches, but manufacturing cost increases
Solution Approach 1:
The valve assembly is combined with the motor housing into a single integrated component. This reduces the number of parts that need to be manufactured, assembled, and quality-checked, thereby lowering manufacturing costs while still providing sufficient hydraulic pressure for dual clutch operation through the integrated valve assembly
4Reliability
If a traditional hydraulic pressure generator with separate valve housing is used, then reliable hydraulic pressure supply is achieved, but system size increases
Solution Approach 1:
The valve assembly is integrated into the motor housing, eliminating the need for separate valve housing. This compact integration reduces the overall system volume and size while maintaining reliable hydraulic pressure supply to the dual clutches through the compact valve assembly design
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 configuration reduces the overall weight, manufacturing cost, and size of the system while enhancing fuel efficiency and simplifying the structure for controlling torque vectoring, allowing for effective torque distribution to the rear wheels based on vehicle behavior.
Implementation Method 1
a hydraulic pressure generator of a regenerative braking system
Implementation Method 2
A motor and a reduction gear, that are driven by electrical energy, are connected to the rear wheels
Implementation Method 3
A power generator which charges a high-voltage battery using the mechanical energy from the engine
Data Source
AI summary
An electric four wheel drive system of a dual clutch type includes dual clutches selectively preventing power from being transmitted to both driving wheels from a motor. A motor housing is mounted on the motor and a hydraulic valve assembly mounted on the motor housing providing operating hydraulic pressure to the dual clutches. The hydraulic valve assembly controls the dual clutches using the hydraulic pressure generated by a hydraulic pressure generator of a regenerative braking system.