Vehicle Engine Brake Control Apparatus for Deceleration Management
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Solution Overview
Problem
Existing vehicle control systems face challenges in achieving a desired deceleration degree while preventing mechanical and regeneration brake exhaustion, leading to insufficient deceleration and increased costs.
Innovation Solution
A vehicle control apparatus that employs a deceleration control unit using a combination of mechanical and regeneration brakes, along with engine braking, to manage the deceleration ratio and reduce brake exhaustion, allowing for efficient deceleration with a desired deceleration degree while minimizing costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If transmission control is used to adjust distance between vehicles, then driver's brake operation load is decreased, but deceleration degree becomes insufficient
Solution Approach 1:
The patent combines transmission control with engine brake control to achieve both distance adjustment and sufficient deceleration. The engine brake is controlled based on the difference between target and actual deceleration, providing additional deceleration force that transmission control alone cannot deliver, while still reducing driver brake operation load.
2Speed
If mechanical brake or regeneration brake is used for deceleration, then desired deceleration degree is achieved, but brake exhaustion occurs increasing cost
Solution Approach 1:
The patent applies engine brake control before mechanical or regeneration brake to reduce the deceleration demand on these brakes. By using engine brake first to provide partial deceleration, the subsequent mechanical or regeneration brake usage is minimized, preventing exhaustion and extending brake life.
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
The system effectively achieves a desired deceleration degree while reducing the exhaustion of mechanical and regeneration brakes, lowering costs and improving comfort by smoothing deceleration changes and reducing noise.
Implementation Method 1
a mechanical brake which converts a kinetic energy of a driving wheel rotation into a thermal energy using friction
Implementation Method 2
a regeneration brake which converts the kinetic energy of a driving wheel rotation into an electric energy using regeneration
Data Source
AI summary
An engine ECU and a brake ECU of a vehicle control apparatus performs any one of a mechanical brake which converts a kinetic energy using rotation of a driving wheel rotation into thermal energy using friction and a regeneration brake which converts the kinetic energy of the driving wheel rotation into electric energy using regeneration, during a vehicle deceleration, after an engine brake changes a deceleration ratio which is a rotation number ratio of driving wheels with respect to the rotation number of an engine.