Electric Brake System with Simulation Device for Stable Pedal Feel
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Solution Overview
Problem
Conventional electronically-controlled brake systems have a complex structure and lack a stable pedal feel during braking, leading to safety concerns and reduced driver convenience due to a pedal stroke-free region and inadequate pressure control.
Innovation Solution
An electric brake system with a master cylinder having two hydraulic circuits, a pressure supplier converting rotational motor force into linear motion, and an electronic control unit for precise pressure control, along with a simulation device to provide a reaction force, ensuring direct pedal effort translation into hydraulic pressure without a stroke-free region.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional electronically-controlled brake system with multiple solenoid valves and accumulators is used, then braking force control is achieved, but the structure becomes complicated
Solution Approach 1:
The patent extracts and eliminates unnecessary components from the conventional brake system. Specifically, it removes the complex arrangement of multiple solenoid valves (first and second solenoid valves) and accumulators (first and second accumulators) while retaining the essential braking force control function through a simplified configuration with a single master cylinder, pump, and blocking valve.
Solution Approach 2:
The patent merges multiple separate components into a more integrated system. The master cylinder is directly connected to the wheel cylinder through a simplified hydraulic passage, and the blocking valve integrates the functions of pressure control and circuit isolation that were previously distributed across multiple valves and accumulators.
2Ease of operation
If a gap is present between the input load and master cylinder, then the master cylinder can be pressed by pedal effort, but a pedal stroke free region is formed causing poor pedal feel
Solution Approach 1:
The patent applies preliminary action by pre-positioning the input load in direct contact with the master cylinder piston, eliminating the gap that causes pedal stroke free region. This ensures that pedal effort is immediately transmitted to generate hydraulic pressure without delay, providing both responsive braking and stable pedal feel.
3Manufacturing precision
If multiple accumulators and solenoid valves are used to control hydraulic pressure, then pressure control is achieved, but the system requires more components and space
Solution Approach 1:
The patent implements self-service through the blocking valve that automatically controls hydraulic pressure based on the operation state of the pump. The blocking valve opens or closes according to pressure requirements without needing multiple solenoid valves and accumulators, achieving accurate pressure control while reducing component count.
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 system achieves accurate pressure control and stable pedal feel during braking, maintaining driver convenience and safety by simplifying the structure and enabling direct pressure application from the brake pedal effort.
Implementation Method 1
a pressure supplier to output a brake pressure when a driver inputs a brake pedal... a pressure supplier converting rotational motor force into linear motion
Implementation Method 2
a master cylinder having two hydraulic circuits to generate a hydraulic pressure using the oil stored in the reservoir... a blocking valve to control the hydraulic pressure from the master cylinder to a wheel cylinder
Implementation Method 3
a simulation device connected to the master cylinder, to provide a reaction force response to the pedal effort of the brake pedal
Data Source
AI summary
The electric brake system for vehicles includes a pressure supplier connected to a reservoir through a hydraulic passage to receive the oil, the pressure supplier outputting a brake will of a driver as an electric signal through the pedal displacement sensor, when the driver pushes the brake pedal, to operate a motor and convert a rotational force of the motor into linear motion, a hydraulic control unit including a first circuit including at least one first vehicle wheel and a second circuit including at least one second vehicle wheel to receive a hydraulic pressure with a force generated by the pressure supplier and thereby perform braking, a blocking valve to control the hydraulic pressure from the master cylinder to a wheel cylinder disposed in each vehicle wheel, a simulation device connected to the master cylinder, to provide a reaction force response to the pedal effort of the brake pedal, and an electronic control unit to control the motor and the valves, based on pressure information and pedal displacement information.