Hybrid Vehicle Braking Interface for Regenerative Control
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Solution Overview
Problem
Hybrid vehicles equipped with parallel hybrid electric drivetrains face challenges in operator control over braking response, particularly in blending regenerative and compression braking, due to limitations in regenerative braking systems that cannot fully replace compression braking, leading to potential energy loss and complex allocation of braking loads.
Innovation Solution
A control interface system that allocates drivetrain braking effort between regenerative and non-regenerative brakes, allowing operator control through a graphical display and in-cab switch pack, enabling selection of target braking effort and displaying actual braking effort, with a hybrid supervisory control module coordinating the blending of braking effects between the IC engine and electrical machine.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If regenerative braking is used to replace compression braking, then energy recovery is improved, but braking torque capability deteriorates
Solution Approach 1:
The system merges regenerative braking and compression braking into a unified drivetrain braking system. The control system dynamically blends both braking modes, allowing the vehicle to utilize the energy recovery advantage of regenerative braking while maintaining the high braking torque capability of compression braking when needed.
Solution Approach 2:
The system dynamically adjusts the blend ratio between regenerative and compression braking based on real-time operating conditions. The control system monitors vehicle speed, battery state of charge, and braking demand to optimize the proportion of each braking mode, transitioning smoothly between modes to maintain both energy efficiency and braking performance.
2Ease of operation
If operator control over drivetrain braking is enhanced, then braking responsiveness is improved, but system complexity increases
Solution Approach 1:
The control system integrates multiple functions into a unified drivetrain braking controller that manages both regenerative and compression braking modes. This multi-functional controller handles energy management, braking force distribution, and operator interface coordination, reducing the need for separate control systems while providing comprehensive braking control.
Solution Approach 2:
The system incorporates automatic control algorithms that independently manage the complex blending of braking modes based on pre-programmed logic and real-time sensor data. The control system self-regulates the braking force distribution between regenerative and compression brakes without requiring manual intervention, simplifying the operator's task while maintaining system sophistication.
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
Enhances operator control over drivetrain braking, optimizing energy recovery and reducing kinetic energy loss by dynamically allocating braking effort between regenerative and compression braking modes, improving the overall efficiency and responsiveness of hybrid vehicle braking systems.
Implementation Method 1
the electrical machine functions as an electrical generator which may be back driven from the vehicle's drive wheels to generate electricity
Implementation Method 2
A compression brake is implemented on a diesel cycle IC engine by altering operation of the engine intake and exhaust valves and cutting off fuel flow to the engine
Data Source
AI summary
A control interface for drivetrain braking provided by a regenerative brake and a non-regenerative brake is implemented using a combination of switches and graphic interface elements. The control interface comprises a control system for allocating drivetrain braking effort between the regenerative brake and the non-regenerative brake, a first operator actuated control for enabling operation of the drivetrain braking, and a second operator actuated control for selecting a target braking effort for drivetrain braking. A graphic display displays to an operator the selected target braking effort and can be used to further display actual braking effort achieved by drivetrain braking.