Vehicle Braking Pump Motor Control for Pressure Responsiveness
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Solution Overview
Problem
Conventional vehicle braking devices face challenges in responsiveness and pump motor deterioration, particularly when transitioning from reduced to increased target control fluid pressure braking force requirements, due to decreased responsiveness in increasing the pump motor's revolution number.
Innovation Solution
A braking device with a pump motor that adjusts its revolution number based on a reduction amount setting unit, which decreases the reduction amount as the probability of brake fluid discharge increases, allowing for better responsiveness when pressure is needed and inhibiting motor deterioration when pressure is not required.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the revolution number of the pump motor is reduced when the gradient of target control fluid pressure braking force is decreased or constant, then deterioration of the pump motor is inhibited, but responsiveness in increasing the revolution number is decreased when pressure increase is required
Solution Approach 1:
The patent applies dynamics by making the pump motor's revolution number adjustable and variable based on real-time braking conditions. The motor control unit dynamically changes the revolution number from a reduced state to a higher state when the gradient of target control fluid pressure braking force increases, ensuring both motor durability during normal operation and responsive pressure generation when needed.
Solution Approach 2:
The patent changes the operational parameters of the pump motor based on the gradient of target control fluid pressure braking force. When this gradient exceeds a predetermined threshold, the control system increases the revolution number from a reduced level, allowing the system to adapt motor speed to actual braking demands and resolve the contradiction between durability and responsiveness.
2Speed
If the pump motor operates at high revolution number continuously, then responsiveness in applying brake fluid pressure is improved, but motor deterioration accelerates
Solution Approach 1:
The patent implements periodic action by operating the pump motor at reduced revolution numbers during normal braking conditions and only increasing to higher revolution numbers when the gradient of target control fluid pressure braking force exceeds a threshold. This intermittent high-speed operation reduces overall motor wear while maintaining responsiveness when needed.
Solution Approach 2:
The system performs preliminary action by pre-reducing the pump motor's revolution number during periods when high pressure is not needed, preparing the motor for extended operation at lower speeds. When braking demands increase, the motor can quickly transition to higher speeds, having been conditioned for efficient operation at both levels.
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
Enhances responsiveness in applying wheel pressure while preventing pump motor deterioration by optimizing the reduction amount of the pump motor's revolution number based on the probability of brake fluid discharge, ensuring efficient fluid pressure control.
Implementation Method 1
a pump motor for driving the pump in accordance with a target wheel pressure
Implementation Method 2
a pump for discharging a brake fluid onto a fluid line between a master cylinder and wheel cylinders of wheels
Data Source
AI summary
The braking device for vehicles includes a reduction amount setting part for setting the amount by which to reduce the revolution of a pump motor during maintenance or reduction of controllable differential pressure so that the reduction amount decreases as the probability increases of needing to discharge the brake fluid by pumps, during a period from when a brake controller begins reducing the revolution until the lapse of prescribed time.