Motorcycle Brake-By-Wire Bypass Isolation for Hydraulic Backup
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Solution Overview
Problem
Existing brake-by-wire systems in motorcycles lack hydraulic backup functionality from both controls (lever and pedal) in case of E/E system failure or power loss, and are not compatible with electric vehicles incorporating regenerative braking and residual torque reduction.
Innovation Solution
A braking system that includes a first hydraulic supply circuit with an electric actuator and a manually actuated piston, featuring a by-pass duct and a processing and control unit to disconnect the electric actuator during standard operation, allowing direct manual actuation in backup mode, and is compatible with electric vehicles by integrating regenerative braking and residual torque reduction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Extent of automation
If a brake-by-wire system uses electric actuators to actuate braking devices, then automation and control precision are improved, but hydraulic backup capability is lost in case of system failure
Solution Approach 1:
The system dynamically switches between electric actuation mode and hydraulic backup mode based on system status. The manually actuated piston is designed to be isolatable from the hydraulic circuit during normal operation, but can be connected when electric actuation fails, allowing the system to adapt its configuration based on operational needs
Solution Approach 2:
A manually actuated piston with by-pass duct serves as an intermediary mechanism between the manual control and the hydraulic circuit. This intermediary allows manual intervention to activate the hydraulic backup system when the electric actuator fails, bridging the gap between the two actuation modes
2Reliability
If a manually actuated piston is connected to the hydraulic supply circuit, then hydraulic backup is enabled, but the system cannot achieve fully fluid-free actuation in electric vehicle mode
Solution Approach 1:
The manually actuated piston is segmented into a direct piston (connected to manual control) and an indirect piston (connected to hydraulic circuit), with a by-pass duct between them. This segmentation allows selective isolation of the hydraulic connection while maintaining manual actuation capability, enabling the system to operate in fully electric mode when needed
Solution Approach 2:
The hydraulic connection to the manually actuated piston can be extracted or disconnected from the main hydraulic supply circuit through the by-pass duct configuration. This allows the manual piston to be isolated from the hydraulic system when electric vehicle mode is active, enabling fluid-free actuation while preserving hydraulic backup capability when needed
3Reliability
If the manually actuated piston remains connected to the hydraulic circuit during standard operation, then hydraulic backup is always available, but the electric actuator cannot fully control the braking device
Solution Approach 1:
The connection between the manually actuated piston and the hydraulic supply circuit is dynamically controllable. During standard electric operation, the manual piston can be isolated from the hydraulic circuit, allowing the electric actuator to have full control authority. When electric actuation fails, the hydraulic connection is activated, providing backup capability without interfering with normal electric operation
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
Enables hydraulic backup from both controls in case of system failure or power loss, ensuring braking capability and compatibility with electric vehicles through regenerative braking and residual torque reduction.
Implementation Method 1
a first indirect piston, in series with the first direct piston, connected thereto by the interposition of a first return spring
Implementation Method 2
a first hydraulic supply circuit... the first indirectly actuated piston being in hydraulic connection with said first hydraulic supply circuit
Data Source
AI summary
A braking system for a motorcycle has a first braking device operatively connected to a first wheel of the motorcycle and having a first hydraulic supply circuit, a first electric actuator operatively connected to a first electrically or electro-mechanically actuated piston, and a first interface port operatively connected to a first hydraulic device provided with a first manually actuated piston subdivided into a first direct piston and a first indirect piston hydraulically connected to the first hydraulic supply circuit through a first by-pass duct. A hydraulic fluid reservoir is connected to the first hydraulic device by an upstream connection duct of the first indirect piston and a downstream connection duct of the first indirect piston. A processing and control unit is programmed so that, upon actuation of the first interface port, the first electrically or electro-mechanically actuated piston translates so as to occlude the first by-pass duct, fluidically disconnect the first manually actuated piston from the first hydraulic supply circuit, and simultaneously actuate the first braking device.