Smart Regenerative Braking Control for Speed Stability
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Solution Overview
Problem
Conventional cruise control systems in electric vehicles are ineffective in maintaining speed on declines, leading to unexpected acceleration, as they cannot be enabled below a certain threshold speed and fail to manage speed when the vehicle accelerates due to gravity.
Innovation Solution
The smart braking system detects triggering conditions such as acceleration without accelerator input or excessive acceleration on inclines and activates the braking system to maintain the current speed, using a combination of friction and regenerative braking, without automatically applying the accelerator.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If cruise control is used to maintain speed, then speed stability is improved, but it cannot be enabled below a certain threshold speed and fails on declines
Solution Approach 1:
The system dynamically switches between cruise control mode and smart braking mode based on operating conditions. When cruise control is unavailable (below threshold speed or on declines), the system transitions to smart braking mode, which uses dynamic detection of accelerator input vs. actual acceleration to maintain speed. This dynamic adaptation resolves the contradiction by providing speed stability through different mechanisms appropriate to different operating conditions.
Solution Approach 2:
The system changes the control parameter from cruise control's fixed speed maintenance to smart braking's acceleration-based control. By monitoring whether the vehicle accelerates more than expected without accelerator input, the system adapts its control strategy to work effectively below threshold speeds and on declines where traditional cruise control fails.
2Use of energy by moving object
If regenerative braking is used alone for speed control, then energy recovery is improved, but speed control precision deteriorates
Solution Approach 1:
The system merges regenerative braking with friction braking in a coordinated fashion. The control system determines the optimal combination of regenerative and friction braking forces needed to maintain speed, allowing the vehicle to recover energy through regenerative braking while using friction braking to provide precise speed control when needed. This combination resolves the contradiction by leveraging the energy recovery capability of regenerative braking and the precision control of friction braking.
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
Prevents undesirable acceleration on declines by selectively applying the braking system to maintain the vehicle's speed, enhancing driver control and safety by compensating for gravitational effects on vehicle speed.
Implementation Method 1
Brakes 24 include one or more friction braking mechanisms and one or more regenerative braking mechanisms that restore energy to the energy storage system by reducing speed of the vehicle 10
Implementation Method 2
Brakes 24 include one or more friction braking mechanisms and one or more regenerative braking mechanisms
Data Source
AI summary
A smart braking system for a vehicle is provided. The smart braking system selectively activates a braking system of the vehicle when the smart braking system detects a scenario in which it is likely that a constant vehicle speed, rather than an increasing vehicle speed, would be desired by a driver. In one example, a driver releases an accelerator while the vehicle is on a decline but the vehicle accelerates anyway. In this instance, the smart braking system records the speed of the vehicle when the accelerator is released and applies the braking system to maintain the speed of the vehicle at the recorded speed while the vehicle is on the decline. The smart braking system stops activating the braking system upon detecting that braking is no longer needed to slow down the vehicle.