Electric Booster Pre-Braking for Faster Pre-Crash Brake Response
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Solution Overview
Problem
The existing vehicle brake systems experience delays in actuating pre-crash brakes due to communication response times and processing delays in converting target values to brake fluid flow rates, which hinders prompt execution of pre-crash brake control.
Innovation Solution
A vehicle brake system that includes a pre-crash brake execution determination section to predict collisions and determine the execution of pre-crash brake operations, with a booster control section that drives the electric booster prior to receiving a command from the braking control section when the change in target value exceeds a threshold, initiating preceding brake control to generate specified brake hydraulic pressure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the brake system uses communication means (CAN) and processing conversion between controllers, then the brake control function is achieved, but the response delay increases and the pre-crash brake actuation is delayed
Solution Approach 1:
The booster control section executes preceding brake control in advance before receiving the formal control command from the braking control section. When the change amount of target value exceeds a threshold, the booster control section proactively drives the electric booster to generate brake hydraulic pressure, thereby reducing the overall response delay of the pre-crash brake system.
2Stability of the object's composition
If the booster control section waits for the command from the braking control section, then the control sequence is maintained, but the pre-crash brake actuation is delayed
Solution Approach 1:
The system performs preliminary brake control action by the booster control section before the formal command arrives. This preliminary action initiates the brake hydraulic pressure generation earlier, improving actuation speed while the subsequent formal command maintains control sequence stability.
Solution Approach 2:
The control system dynamically adjusts its operation mode based on the change amount of target value. When the change exceeds a threshold, the booster control section transitions to proactive preceding brake control, otherwise it maintains normal sequential operation, thereby optimizing actuation speed under critical conditions.
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 approach reduces the delay time from the execution request of pre-crash brake to its actual actuation, enabling faster generation of braking force and potentially reducing collision impact or damage.
Implementation Method 1
an electric booster that uses output torque of an electric motor to boost brake operation input and transmits the boosted brake operation input to the master cylinder
Implementation Method 2
a master cylinder that supplies a brake fluid to the hydraulic unit; a hydraulic unit that regulates a brake hydraulic pressure generated to a wheel cylinder
Data Source
AI summary
[Problem] The present invention provides a vehicle brake system capable of shortening a delay time from time at which an execution request of a pre-crash brake executed by actuation of an electric booster is sent to time at which the pre-crash brake is actually actuated.[Means for Resolution] In a vehicle brake system (1) including: a hydraulic unit (20); a braking control section (90) for controlling the hydraulic unit (20); a master cylinder (14); an electric booster (10); a booster control section (100) for controlling the electric booster (10); and a pre-crash brake execution determination section (110), the pre-crash brake execution determination section (110) sends information on a specified target value (P_tgt) for decelerating a vehicle to the booster control section (100) and the braking control section (90). When a change amount (ΔP) of the target value (P_tgt) received from the pre-crash brake execution determination section (110) exceeds a specified threshold value (ΔP_thr), the booster control section (100) drives the electric booster (10) prior to a command from the braking control section (90) and executes preceding brake control for generating a specified brake hydraulic pressure to a wheel cylinder.