HEV Downhill Brake Control Regenerative Hydraulic Coordination
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Solution Overview
Problem
Hybrid electric vehicles (HEVs) with Downhill Brake Control (DBC) face issues with poor brake capacity and cooling performance, leading to increased brake hydraulic braking demand and frequency, which deteriorates brake hardware durability.
Innovation Solution
A control device and method that cooperatively control regenerative braking and brake hydraulic braking in HEVs, determining the need for braking control based on vehicle speed differences and calculating the appropriate braking demand to optimize the use of regenerative and hydraulic braking, thereby reducing the reliance on brake hydraulic pressure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If brake hydraulic braking is used for DBC control in HEV, then vehicle speed control is achieved, but brake hardware durability deteriorates due to increased braking amount and frequency
Solution Approach 1:
The patent combines regenerative braking and brake hydraulic braking into a unified DBC control system. The processor determines whether to use regenerative braking alone or in combination with brake hydraulic braking based on the braking demand amount and maximum regenerative braking possible amount, merging two braking mechanisms to achieve both speed control and improved durability
Solution Approach 2:
The system dynamically changes the braking mechanism parameters by switching between regenerative braking and brake hydraulic braking based on real-time conditions. When braking demand is low, regenerative braking is used; when braking demand is high, brake hydraulic braking is activated, changing the operational parameters to optimize both speed control and brake durability
2Speed
If brake hydraulic braking is used for DBC control in HEV, then vehicle speed control is achieved, but fuel efficiency decreases
Solution Approach 1:
The patent converts the kinetic energy that would normally be wasted during braking into useful electrical energy through regenerative braking. By prioritizing regenerative braking in the DBC control, the system transforms energy loss into energy recovery, improving fuel efficiency while maintaining vehicle speed control capability
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
Improves fuel efficiency by prioritizing regenerative braking and enhances brake durability by reducing the frequency and amount of brake hydraulic braking, thus extending the vehicle's travel range and prolonging brake component lifespan.
Implementation Method 1
control a vehicle speed of the HEV by determining whether to perform cooperative control of a regenerative braking and a brake hydraulic braking
Implementation Method 2
controls output torque of a brake by adjusting a brake hydraulic pressure based on the brake hydraulic braking demand amount
Data Source
AI summary
The present invention relates to a control device and method of a hybrid electric vehicle (HEV) to which Downhill Brake Control (DBC) is applied, and determines whether to perform a braking control of the HEV, by comparing a current vehicle speed of the HEV with a target vehicle speed of the HEV upon operating a DBC function, calculates a braking demand amount based on a difference between the current vehicle speed and the target vehicle speed when the braking control is determined, and controls a vehicle speed of the HEV by determining whether to perform cooperative control of a regenerative braking and a brake hydraulic braking, based on the braking demand amount and a maximum regenerative braking possible amount.