Vehicle Brake System Engine-Off Collision Braking
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Solution Overview
Problem
Existing vehicle brake systems generate excessive braking force when the engine is stopped, leading to double collision impacts on drivers and increased electrical power consumption, which can result in power exhaustion and difficulty restarting the engine.
Innovation Solution
A vehicle brake system that includes a first hydraulic pressure generator and a second hydraulic pressure generator, with the brake controller adjusting the braking force to be smaller when the engine is stopped, using a second hydraulic pressure generator with an electrical pressurizing device to minimize power consumption and reduce impact on the driver.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the brake controller is actuated to generate braking force when a collision is detected while the engine is stopped, then the vehicle can be braked after collision, but the electrical power consumption increases and may exhaust the stored electrical power
Solution Approach 1:
The brake controller dynamically adjusts the braking force based on engine status. When the engine is detected to be stopped, the controller reduces the braking force to a smaller level compared to when the engine is running. This dynamic adjustment resolves the contradiction by maintaining sufficient braking capability while reducing electrical power consumption during engine-off collisions.
Solution Approach 2:
The system changes the braking force parameter according to the engine operation state. By detecting whether the engine is running or stopped, the brake controller modifies the hydraulic pressure generation command to produce appropriate braking force levels, thereby balancing safety requirements with electrical power conservation.
2Reliability
If a large braking force is generated when the engine is stopped and collision occurs, then the vehicle can be effectively braked, but the driver receives double collision impact which greatly affects the driver
Solution Approach 1:
The brake controller implements dynamic braking force adjustment based on real-time detection of engine status. When the engine is stopped, the controller automatically reduces the braking force magnitude, thereby preventing excessive impact on the driver while still providing effective braking for vehicle stopping.
Solution Approach 2:
The system performs preliminary detection of engine status before collision braking is applied. By detecting the engine stop state in advance, the brake controller prepares to apply reduced braking force, preventing the harmful effect of double collision impact on the driver while maintaining braking effectiveness.
3Use of energy by moving object
If the brake controller generates small braking force when the engine is stopped, then the electrical power consumption is reduced, but the braking capability may be insufficient for effective vehicle stopping
Solution Approach 1:
The brake controller adjusts the braking force parameter according to engine operation status. When the engine is stopped, a reduced braking force parameter is applied, which consumes less electrical power while still providing sufficient braking capability for safe vehicle stopping.
Solution Approach 2:
The system dynamically adapts the braking force level to match the operational context. During engine-off collisions, the controller provides just enough braking force to stop the vehicle safely without generating excessive hydraulic pressure, thereby optimizing the balance between power consumption and braking effectiveness.
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 reduces braking force and electrical power consumption when the engine is stopped, minimizing impact on the driver and preventing power exhaustion, ensuring smoother engine restarts.
Implementation Method 1
a first hydraulic pressure generator that generates a hydraulic pressure in hydraulic oil in accordance with an operation amount of a brake actuation section
Implementation Method 2
a second hydraulic pressure generator that generates a hydraulic pressure in the hydraulic oil in response to a hydraulic pressure generation command received from a brake controller
Implementation Method 3
at least one brake operation section that is actuated by the hydraulic pressure generated in the hydraulic oil in the first hydraulic pressure generator or by the hydraulic pressure generated in the hydraulic oil in the second hydraulic pressure generator, and that generates braking force to brake at least one wheel of a vehicle
Data Source
AI summary
A vehicle brake system includes a master cylinder that generates a hydraulic pressure according to an operation amount of a brake pedal, a vehicle stabilization device that generates a hydraulic pressure in response to a hydraulic pressure generation command received from a brake controller, and front brake operation sections and rear brake operation sections that are actuated by the hydraulic pressure generated by the master cylinder or by the vehicle stabilization device and that generate braking force on the vehicle. A brake controller actuates automatic braking when an impact has been detected by a collision detection sensor, and actuates the automatic braking with smaller braking force when an engine is stopped than when the engine is running.