Blended Braking Torque Distribution in Hybrid Powertrains
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Solution Overview
Problem
Existing hybrid powertrain systems face challenges in efficiently managing regenerative braking torque, as they struggle to coordinate the interaction between internal combustion engines, electric machines, and friction brakes to optimize energy recovery and vehicle deceleration.
Innovation Solution
A control system is introduced that includes a brake control module and a second control module, which determine regenerative braking axle torque capacity and request, and generate control signals to manage the actuable friction brake and power output from electric machines, ensuring optimal torque distribution and energy recovery during braking.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If regenerative braking torque is maximized, then energy recovery is improved, but friction brake wear increases due to insufficient braking torque distribution
Solution Approach 1:
The control system dynamically adjusts the distribution of braking torque between regenerative braking and friction brakes based on real-time operating conditions. The brake control module continuously monitors braking requests and regenerative braking capacity, then modulates the friction brake application to supplement or reduce regenerative braking as needed, optimizing both energy recovery and brake wear reduction
Solution Approach 2:
The system changes the parameter of braking torque distribution by calculating the difference between the total braking torque request and the available regenerative braking torque. The brake control module uses this parameter to determine the exact amount of friction brake torque needed, thereby optimizing the balance between energy recovery and brake component protection
2Speed
If friction brake torque is increased, then vehicle deceleration is improved, but energy recovery from regenerative braking decreases
Solution Approach 1:
The control system performs preliminary action by determining the regenerative braking axle torque capacity before applying friction brakes. The brake control module calculates the available regenerative braking torque and uses this information to optimize the friction brake application, ensuring that regenerative braking is maximized first before supplementing with friction braking
Solution Approach 2:
The system implements feedback by continuously monitoring the braking torque request and the actual regenerative braking torque being applied. The brake control module uses this feedback to adjust the friction brake application in real-time, ensuring optimal vehicle deceleration while maximizing energy recovery based on the actual system response
3Loss of energy
If regenerative braking control is added to the hybrid powertrain system, then energy recovery is improved, but system complexity increases due to additional control modules and coordination requirements
Solution Approach 1:
The brake control module merges the control functions for both regenerative braking and friction braking into a single integrated control unit. This consolidation simplifies the overall control architecture by eliminating the need for separate control modules, while still providing comprehensive management of the blended braking system through unified torque distribution logic
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 system enhances the efficiency of regenerative braking by effectively combining regenerative and friction braking torque, improving energy recovery and vehicle deceleration, while optimizing fuel economy and reducing wear on brake components.
Implementation Method 1
Machines, operative as motors or generators, can generate torque inputs to the transmission independently of a torque input from the internal combustion engine. The Machines may transform vehicle kinetic energy transmitted through the vehicle driveline to energy that is storable in an energy storage device.
Implementation Method 2
an actuable friction brake
Data Source
AI summary
An engine and a second power generating device transmit power through a transmission to a driveline to a wheel. A control module determines a regenerative braking axle torque capacity and a regenerative braking torque. Power output from the second power generating device is controlled based upon a regenerative braking axle torque request. A brake control module determines a total braking torque request and generates the regenerative braking axle torque request based upon the total braking torque request, the regenerative braking axle torque capacity, and the regenerative braking torque. The brake control module controls a friction brake.