Vehicle Control System Braking Force Management
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Solution Overview
Problem
When a vehicle is parked on a slope with a stopped engine and shifted to N-range, the electric brake booster may stop functioning due to low battery voltage, leading to insufficient braking force and kickback issues, making it difficult to maintain the vehicle's position and requiring complex operations to release the parking brake and start the engine.
Innovation Solution
A vehicle control system that includes a boost device for enhancing braking force, a cell motor for starting the engine, and a start operation unit that initiates the cell motor only when the braking unit is operational, ensuring consistent braking even without sufficient battery voltage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the EBB is used to boost braking force with battery voltage, then braking performance is improved, but the system becomes unreliable when battery voltage drops during engine starting
Solution Approach 1:
The patent introduces a control unit as an intermediary that manages the interaction between the EBB, EPB, and cell motor. This control unit monitors battery voltage and braking force requirements, automatically switching between EBB and EPB operations to maintain reliable braking during engine starting without requiring complex manual intervention or system redesign
Solution Approach 2:
The system dynamically changes operational parameters by switching between different braking modes (EBB with battery voltage vs. EPB without battery voltage) based on the cell motor's operating state. When the cell motor draws high current causing voltage drop, the control unit transitions from EBB to EPB operation, maintaining braking force reliability while adapting to changing electrical conditions
2Reliability
If the EPB is automatically operated when the engine is stopped, then vehicle stability on slope is improved, but the system becomes difficult to release and requires complex operations
Solution Approach 1:
The control unit automatically manages the EPB's engagement and release based on engine state and braking force requirements. When the engine is stopped and braking force is needed, the EPB engages automatically; when the engine starts or sufficient braking force is available, the control unit automatically releases the EPB, eliminating the need for manual intervention and simplifying driver operations
Solution Approach 2:
The system implements feedback control where the control unit continuously monitors engine state, battery voltage, and braking force requirements to automatically adjust EPB operation. This feedback mechanism ensures the EPB is released at the appropriate moment during engine starting, maintaining vehicle stability while enabling easy release without complex manual procedures
3Speed
If the cell motor is started without ensuring braking unit operation, then engine starting speed is improved, but vehicle safety is compromised due to insufficient braking force
Solution Approach 1:
The control unit performs preliminary assessment of braking unit availability before allowing cell motor operation. It checks whether the EBB or EPB is ready to provide sufficient braking force before permitting the cell motor to draw high current for engine starting, preventing unsafe conditions while maintaining fast engine starting capability
Solution Approach 2:
The system implements preliminary anti-action by having the control unit prevent cell motor starting if braking force would be insufficient. The control unit blocks the starting sequence until braking units are confirmed operational, countering the potential harmful effect of vehicle movement during engine starting while preserving rapid starting when safe
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 unintentional vehicle movement and reduces driver discomfort by maintaining braking force and eliminating kickback, simplifying the process of starting the engine and releasing the parking brake.
Implementation Method 1
a battery 80 for supplying an output voltage, an EBB 3 which performs a control of a booster of braking force with an electrical power from the battery 80, and a cell motor 8c which is driven by an output voltage from the battery 80 and starts the engine 8
Data Source
AI summary
A vehicle control system includes a boost device, a braking unit, a cell motor, and a start operating unit. The boost device boosts a braking force applied by a foot brake to a vehicle with an output voltage from a battery. The braking unit, which is different than the foot brake, brakes the vehicle appropriately and keeps the braking force even in a case that the output voltage is not supplied from the battery, or which braking unit does not require the output voltage from the battery. The cell motor is driven by an output voltage from the battery and starts the engine. The start operation unit starts the cell motor, wherein the vehicle control system has a function not to start the cell motor when the start operation unit is operated, unless the braking unit is in operation.