Secondary Brake Boost System for Autonomous Vehicle Deceleration
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Solution Overview
Problem
Secondary brake systems in autonomous vehicles, which rely on hydraulic pressure, often fail to generate sufficient braking force for all four wheels, especially when the primary brake system malfunctions, necessitating a solution to ensure adequate deceleration in critical situations.
Innovation Solution
A braking system that includes both a primary and a secondary brake system, where the secondary system generates additional boost pressure to compensate for the loss of braking force by activating a motor and pump to provide pressure to at least one set of braking units, allowing for sufficient deceleration when the primary system is inactive.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the secondary brake system uses hydraulic pressure to generate braking force, then the braking force is sufficient for two wheels, but the braking capability is insufficient for all four wheels when the primary brake system malfunctions
Solution Approach 1:
The brake system is segmented into a primary brake system that normally controls all four braking units, and a secondary brake system that can independently control at least one braking unit when the primary system malfunctions. This segmentation allows the secondary system to provide targeted braking assistance without requiring full redundancy of the entire brake system.
Solution Approach 2:
The system changes the operational parameters by switching from the primary brake system to the secondary brake system when a malfunction is detected. The secondary system adjusts hydraulic pressure parameters to compensate for the loss of braking force, ensuring sufficient deceleration capability is maintained despite the system transition.
2Force
If the secondary brake system activates additional braking units with boost pressure, then sufficient deceleration is achieved, but the brake pedal force and travel distance increase
Solution Approach 1:
The secondary brake system utilizes hydraulic pressure to generate boost force at the brake pedal. When additional braking force is required and the primary system is inactive, the secondary system activates a pump to increase hydraulic pressure, which amplifies the driver's brake pedal input force, thereby achieving sufficient braking force without requiring excessive pedal travel or force from the driver.
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
Ensures the vehicle can achieve desired deceleration by combining braking forces from both systems, reducing the need for excessive brake pedal force and distance traveled, and maintaining safety in autonomous driving scenarios.
Implementation Method 1
some secondary brake systems, which use hydraulic pressure to generate braking force
Implementation Method 2
All of the braking units provide braking force when the primary braking system is active
Data Source
AI summary
A braking system for a vehicle, which includes both a primary brake system, and a secondary brake system. A plurality of braking units are controlled by the primary brake system when the primary brake system is active, and at least one of the plurality of braking units controlled by the secondary brake system when the primary brake system is inactive. An actuator is part of the primary brake system, and the actuator is controlled by a primary controller. The primary controller selectively actuates the actuator to control the fluid pressure in the primary brake system to selectively actuate the plurality of braking units when the primary brake system is active, and when the primary brake system is inactive, the secondary brake system generates a boost pressure in the at least one of the plurality of braking units controlled by the secondary brake system.