Motorcycle Brake Valve Control for Pump Pulsation
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Solution Overview
Problem
The existing motorcycle brake system experiences pulsation at the hand or foot brake lever due to the reactive effect of pump pressure on the manually operated master brake cylinder, which is not effectively mitigated.
Innovation Solution
The change-over valve and/or separating valve are switched into positions that diminish pressure pulses generated by the pump at the start of operation, either by throttling or closing the separating valve, or by short-circuiting the pump suction side with the pressure side using the change-over valve and separating valve.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the pump is activated to build brake pressure in the brake circuit, then brake pressure is generated, but pulsation is sensed at the manually operated master brake cylinder due to reactive pump pressure
Solution Approach 1:
The separating valve is closed before the pump starts operating to prevent the reactive pressure pulses from reaching the master brake cylinder. This preliminary action blocks the harmful pressure wave path in advance, ensuring smooth brake lever operation while still allowing the pump to build pressure in the brake circuit through the open change-over valve.
Solution Approach 2:
The hydraulic circuit is segmented into separate pressure zones using the separating valve and change-over valve. The separating valve isolates the master brake cylinder from the pump's suction side, while the change-over valve controls pressure delivery to the brake circuit. This segmentation allows independent control of pressure generation and pressure delivery, eliminating the reactive effect on the brake lever.
2Ease of operation
If the separating valve is closed to prevent pump pressure reactive effect, then pulsation is reduced, but brake pressure buildup may be affected
Solution Approach 1:
The system dynamically controls the valve positions based on the pump operation state. During pump startup, the separating valve is closed to prevent pulsation, while the change-over valve is opened to allow pressure buildup in the brake circuit. This dynamic coordination ensures both smooth operation and effective pressure generation.
Solution Approach 2:
The change-over valve acts as an intermediary that allows the pump to deliver pressure to the brake circuit even when the separating valve is closed. It provides an alternative pressure path that bypasses the blocked route through the master brake cylinder, maintaining pressure buildup capability while preventing reactive effects.
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
This solution effectively prevents the reactive effect of pump pressure on the hand-operated or foot-operated master brake cylinder, ensuring a stable and comfortable brake operation by maintaining the valves in throttled or closed positions for a defined duration, thereby reducing pulsation.
Implementation Method 1
a dual-circuit pump drivable by an electric motor are mounted in the front-wheel and rear-wheel circuits
Implementation Method 2
hydraulic actuation of a first brake circuit and with a second hand-operated or foot-operated master brake cylinder for the hydraulic actuation of a second brake circuit
Implementation Method 3
switching the change-over valve and/or the separating valve into switching positions during the start of the pump, in which positions the valves diminish pressure pulses generated by the pump
Implementation Method 4
electromagnetically activatable inlet and outlet valves and a dual-circuit pump
Implementation Method 5
One shortcoming of this brake system is the reactive effect of the pump pressure on the hand-operated master brake cylinder, with the result that pulsation can be sensed at the hand or foot brake lever
Data Source
AI summary
In a dual-circuit hydraulic motorcycle brake system with two hand or foot-operated master cylinders, at the commencement of the pump operation in one of the brake circuits, the change-over valve (20) and/or the separating valve (19) of that brake circuit assume a switching position in which the pressure which can be generated by the pump (9) is prevented from causing a reactive effect on the associated hand-operated or foot-operated master brake cylinder (7, 13). To this end, the separating valve (19) in the brake line may be switched to a closed or throttling position, while the change-over valve (20) in the suction path is closed. Alternatively, both the change-over valve (20) and the separating valve (19) can be opened at the same time so that the pump conveys brake fluid in a circle.