Electro-Hydraulic Braking Pump Control for Noise Reduction
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Solution Overview
Problem
Existing vehicle braking systems, particularly electro-hydraulic systems, experience undesirable noise and vibration due to the accumulation of hydraulic pressure, which current calibration methods fail to effectively mitigate.
Innovation Solution
A method and system that utilize sensors to measure vehicle speed and hydraulic pressure, with a processor controlling an electric motor and pump to optimize hydraulic pressure accumulation based on these measurements, thereby reducing noise and vibration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the pump operates continuously to accumulate hydraulic pressure in the braking system, then the braking pressure availability is improved, but noise and vibration increase
Solution Approach 1:
The patent applies dynamics by making the pump operation variable rather than continuous. The controller adjusts pump operation based on real-time conditions including vehicle speed, brake pedal position, and current hydraulic pressure levels. This dynamic control allows the system to maintain braking pressure availability when needed while avoiding continuous operation that generates noise and vibration.
Solution Approach 2:
The patent implements feedback control through sensors that continuously monitor hydraulic pressure levels, vehicle speed, and brake pedal position. This feedback information is processed by the controller to determine optimal pump operation timing and duration, ensuring braking pressure is accumulated only when necessary and at appropriate times, thereby reducing unnecessary noise and vibration while maintaining braking readiness.
2Speed
If the pump accumulates hydraulic pressure at high rates, then the braking response time is improved, but noise and vibration become more pronounced
Solution Approach 1:
The patent applies periodic action by controlling the pump to operate in intermittent cycles rather than continuously. The controller activates the pump in periodic bursts to accumulate hydraulic pressure to target levels, then allows the system to maintain pressure without continuous pumping. This periodic operation achieves adequate braking pressure buildup while significantly reducing the cumulative noise and vibration compared to continuous high-rate pumping.
Solution Approach 2:
The patent changes operational parameters dynamically based on vehicle conditions. The controller adjusts pump operation parameters including duty cycle, pressure target levels, and accumulation rates based on factors such as vehicle speed, anticipated braking demands, and current hydraulic pressure. This parameter adaptation allows the system to achieve necessary braking response times while operating the pump at lower, quieter intensity levels during normal driving conditions.
3Power
If the braking system accumulates high hydraulic pressure, then the braking power is improved, but noise and vibration occur under certain conditions
Solution Approach 1:
The patent applies preliminary action by pre-accumulating hydraulic pressure to predetermined target levels during periods when braking is not actively demanded. The controller monitors system pressure and activates the pump in advance to build pressure reserves, then maintains these levels without continuous operation. This preliminary pressure accumulation ensures high braking power is available when needed while avoiding continuous pumping that generates noise and vibration during normal vehicle 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
The solution effectively calibrates the braking system to minimize noise and vibration, particularly at low vehicle speeds where hydraulic pressure demand is lower, enhancing the braking experience by reducing unwanted noise and vibration.
Implementation Method 1
the accumulation of the hydraulic pressure can cause undesirable noise and vibration under certain conditions
Implementation Method 2
an electric motor causes a pump to provide an accumulation of hydraulic pressure
Data Source
AI summary
Methods, systems, and vehicles are provided for calibrating a braking system of a vehicle. The braking system has an electric motor, a pump, and a hydraulic accumulator. A speed of the vehicle is obtained, and a pressure within the hydraulic accumulator is measured. The pump is operated via an electric motor to provide hydraulic pressure to the hydraulic accumulator based on the speed of the vehicle and the measure of pressure of the hydraulic accumulator.