Vehicle Drive System Recuperation Control
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Solution Overview
Problem
Existing drive systems for motor vehicles face a conflict between optimizing vehicle movement dynamics and reducing CO2 emissions through efficient torque distribution, while maintaining stability and dynamic control.
Innovation Solution
A drive system with independent electric drives, a power electronics system, and a control device comprising a drive control module, a recuperation control module, and a brake control module, which adjusts recuperation limiting values and generates hydraulic brake pressure to optimize energy recovery and stability, allowing for efficient energy use during braking without compromising wheel or vehicle stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If torque distribution is adapted to optimize vehicle movement dynamics and stability control, then vehicle stability and movement dynamics are improved, but energy consumption and CO2 emissions increase
Solution Approach 1:
The system dynamically adapts the torque distribution between the front and rear axles based on real-time driving conditions, vehicle state, and stability requirements. The control device continuously adjusts the torque split ratio to optimize both stability control and energy efficiency, rather than using a fixed distribution strategy
Solution Approach 2:
The system changes the operational parameters of the electric drives, including torque magnitude, rotational speed, and recuperation levels, to achieve optimal balance between stability control performance and energy recovery. The control device modifies these parameters dynamically based on driving situation and battery state of charge
2Loss of energy
If maximum recuperation torque is used during braking, then energy recovery is maximized, but wheel or vehicle stability is compromised
Solution Approach 1:
The control device implements a feedback mechanism that continuously monitors wheel speed, acceleration, and vehicle state to determine the maximum safe recuperation torque. The system adjusts the recuperation limiting value based on real-time stability requirements, ensuring that energy recovery does not compromise wheel or vehicle stability
Solution Approach 2:
Instead of applying maximum possible recuperation torque, the system applies a partially limited recuperation torque that is optimized for both energy recovery and stability maintenance. The recuperation limiting value is calculated to provide sufficient energy recovery while maintaining a safety margin for stability control
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 achieves energy-efficient drive torque distribution that enhances vehicle stability and movement dynamics while reducing CO2 emissions by effectively utilizing energy generated during braking, without adverse effects on wheel or vehicle stability.
Implementation Method 1
the brake control module is configured to generate an associated hydraulic brake pressure phydr. and transmit this hydraulic brake pressure phydr. to a brake system
Data Source
AI summary
A drive system includes at least two drive devices, at least one of which is electric, that drive at least two drive axles, a power electronics system, an energy storage arrangement, and a control device. The control device includes a drive control module for providing a recuperation limiting value for each electric drive, a recuperation control module for combining the recuperation limiting values to form a maximum recuperation total limiting value, and a brake control module for providing a total braking torque requested by a driver or assistance system, such that it derives a recuperation total torque that is less than the recuperation total limiting value and also derives recuperation partial torques for each electric drive. In the case of a total braking torque that is greater than the recuperation total limiting value, the brake control module generates a hydraulic brake pressure and transmits it to the brake system.