Electronic-Mechanical Brake Switching for Fail-Safe Vehicle Braking
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Solution Overview
Problem
Existing brake systems face safety issues when electronic mechanical braking fails, and hydraulic backup systems have complex structures and high maintenance costs.
Innovation Solution
A combined electronic mechanical brake system that includes a switch mechanism to transition between electronic and mechanical braking modes, eliminating hydraulic components and using a mechanical brake mechanism to ensure braking functionality even when the electrical system fails.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If electronic mechanical braking only is used, then the brake structure is simple, but safety is compromised when the electronic brake fails
Solution Approach 1:
The brake system is divided into two independent subsystems: an electronic brake mechanism and a mechanical brake mechanism. Each subsystem can independently provide braking function, allowing the system to maintain braking capability even when one subsystem fails. The electronic brake includes a motor, reducer, and brake assembly, while the mechanical brake includes a brake pedal, transmission assembly, and actuator, creating redundant braking pathways.
Solution Approach 2:
The switch mechanism changes the connection state between components based on the operational status of the electronic brake. When the electronic brake is normal, the switch mechanism connects the brake pedal to the electronic brake mechanism and disconnects the mechanical brake mechanism. When the electronic brake fails, the switch mechanism automatically switches to connect the brake pedal to the mechanical brake mechanism, changing the system's operational parameters to maintain safety.
2Reliability
If hydraulic backup braking is added, then braking safety is improved, but the mechanical structure becomes complicated
Solution Approach 1:
The patent extracts and eliminates the hydraulic system from the brake mechanism, replacing it with a purely mechanical brake mechanism for backup braking. This removes complex hydraulic components such as oil circuits, sealed cavities, and stepped pistons, while still providing reliable backup braking functionality through the mechanical brake mechanism that directly converts pedal force to brake actuation.
Solution Approach 2:
The hydraulic backup braking system is replaced with a mechanical brake mechanism. The mechanical brake uses a brake pedal, transmission assembly, and actuator that directly mechanically transmit force to the brake, eliminating the need for hydraulic fluid, seals, and pressure transmission systems while maintaining the backup braking function.
3Reliability
If hydraulic backup braking is added, then braking safety is improved, but maintenance costs increase
Solution Approach 1:
The mechanical brake mechanism uses simpler, more durable components that do not require periodic maintenance like hydraulic systems. The mechanical components such as the brake pedal, transmission assembly, and actuator are designed to be robust and maintenance-free, eliminating the need for brake fluid replacement and hydraulic system maintenance, thereby reducing long-term operational costs.
Data Source
AI summary
An electronic mechanical brake system and a vehicle. The electronic mechanical brake system includes a brake pedal, an electronic brake mechanism, a mechanical brake mechanism, a brake, and a switch mechanism with a first state and a second state. The electronic brake mechanism includes a controller and an electronic signal sensor. The controller, the electronic signal sensor, and the brake are electrically connected. When the switch mechanism is in the first state, the electronic signal sensor is configured to receive a braking signal of the brake pedal and transmit the braking signal to the controller. The controller controls the brake to brake based on the braking signal. The electronic mechanical brake system can improve driving safety. In addition, reliability of the mechanical brake system is high, and costs are low.