Brake Control Device Deceleration Profile Smoothing
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Solution Overview
Problem
Existing brake control technologies, such as those described in Japanese Unexamined Patent Application Publication No. 2021-112950, may cause an unnatural braking feeling due to a large change in deceleration immediately before a vehicle stops, which can lead to pitching behavior and discomfort for the driver.
Innovation Solution
A brake control device that acquires the brake pedal operation amount and in-vehicle sensor detection results to determine the requested deceleration, and then executes reducing control by decreasing deceleration immediately before stopping, while also considering increasing control based on sensor detection to maintain a smoother deceleration profile.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If increasing control and reducing control are executed immediately before the vehicle stops to suppress pitching behavior, then pitching behavior is suppressed, but the change in deceleration becomes large causing unnatural braking feeling
Solution Approach 1:
The brake control device executes increasing control before reducing control immediately before vehicle stop. This preliminary action of increasing deceleration before the final reduction helps to smooth out the deceleration profile, preventing the unnatural braking feeling that would result from direct reducing control alone, while still achieving the ultimate goal of suppressing pitching behavior through the subsequent reducing control.
Solution Approach 2:
The control system applies periodic adjustments to deceleration by alternating between increasing control and reducing control phases. This periodic modulation of deceleration allows the system to manage the transition to stop more smoothly, distributing the deceleration changes over time rather than applying them all at once, thereby maintaining natural braking feeling while suppressing pitching.
2Stability of the object's composition
If reducing control is executed to reduce deceleration immediately before stopping, then pitching behavior is suppressed, but braking feeling may become unnatural due to abrupt deceleration change
Solution Approach 1:
The brake control device executes increasing control before reducing control immediately before vehicle stop. This preliminary action of increasing deceleration before the final reduction helps to smooth out the deceleration profile, preventing the unnatural braking feeling that would result from direct reducing control alone, while still achieving the ultimate goal of suppressing pitching behavior through the subsequent reducing control.
Data Source
AI summary
A brake control device includes a deciding unit for deciding a requested deceleration that is requested by the driver, based on the brake pedal operation amount that is acquired, and a braking processing unit for deciding a braking amount of braking to be executed by a brake device, based on the requested deceleration that is decided, and deciding to execute reducing control in which a deceleration is reduced as compared to the requested deceleration immediately before stopping a vehicle. The braking processing unit is configured to execute increasing control in which a deceleration is increased as compared to the requested deceleration before executing the reducing control, and decides whether to execute the increasing control based on the detection result of the in-vehicle sensor.