Vehicle Control Device Regenerative Braking Stability Priority
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Solution Overview
Problem
Existing vehicle control systems face challenges in maintaining appropriate vehicle stability when regeneration enhancement control and vehicle stability control are simultaneously carried out, leading to interference between the two systems, which can result in inadequate vehicle stability and discomfort for the driver.
Innovation Solution
A vehicle control device that prioritizes vehicle stability control over regeneration enhancement control, using a regenerative braking device and friction braking device to manage brake hydraulic pressure, and includes prioritization means to prevent simultaneous execution of both controls, ensuring stable vehicle travel by inhibiting regeneration enhancement control during vehicle stability control operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If regeneration enhancement control is carried out to increase electric power recovery, then fuel consumption performance is improved, but vehicle stability control may be interfered with and not carried out appropriately
Solution Approach 1:
The control system dynamically adjusts the regenerative braking force based on vehicle stability requirements. When vehicle stability control is detected to be executed, the regeneration enhancement control is suspended or its target regenerative braking force is reduced, allowing the vehicle stability control to operate effectively without interference while still enabling energy recovery during normal deceleration conditions
Solution Approach 2:
The control device acts as an intermediary between the regeneration enhancement control and vehicle stability control systems. It detects the execution state of vehicle stability control and uses this information to modulate the regenerative braking force, preventing harmful interference while maintaining beneficial energy recovery functionality
2Productivity
If regenerative braking force is increased to maximize energy recovery, then productivity is improved, but vehicle stability may be compromised during simultaneous stability control operations
Solution Approach 1:
The system dynamically modulates the regenerative braking force according to real-time vehicle stability requirements. During normal operation, maximum regenerative braking force is applied to maximize energy recovery. When vehicle stability control is activated, the regenerative braking force is automatically reduced or suspended to prevent interference with stability control operations
Solution Approach 2:
The control device changes the regenerative braking force parameter based on the execution state of vehicle stability control. By detecting stability control activation, the system adjusts the regenerative braking force parameter to appropriate levels, ensuring vehicle stability is maintained while still enabling efficient energy recovery during normal deceleration
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 solution allows for appropriate vehicle stability control without interference from regeneration enhancement control, reducing driver discomfort and maintaining vehicle stability during various driving conditions, including slippery roads.
Implementation Method 1
a regenerative braking device configured to generate electric power by a wheel rotated by an external force and to recover the generated electric power to an in-vehicle battery
Implementation Method 2
a friction braking device configured to apply a friction braking force to the wheel through a brake hydraulic pressure
Data Source
AI summary
Appropriate vehicle stability control is enabled in a vehicle configured to carry out regeneration enhancement control. A predictive deceleration support control unit is configured to set a position at which the vehicle is predicted to finish deceleration as a target deceleration end position, and guide a driver to release an accelerator pedal so that the deceleration of the vehicle is finished at the target deceleration end position, to thereby carry out regeneration enhancement control under a state in which the accelerator pedal is released so as to generate a larger deceleration than in a normal state. The predictive deceleration support control unit is configured to read a vehicle stability control flag from a brake ECU and stop the regeneration enhancement control when the vehicle stability control is being carried out.