Vehicle Brake Control Device Seal Deformation Correction
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Solution Overview
Problem
The existing electric parking brake systems face issues with insufficient piston pullback due to inadequate deformation of seal members, leading to instability and increased complexity and cost in the brake system.
Innovation Solution
The implementation of a brake fluid pressure adjustment mechanism that automatically increases the wheel cylinder pressure during the lock and release operations to correct seal member deformation, utilizing pressure detection and movement position estimation to optimize fluid pressure for reliable piston return.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the EPB motor is caused to rotate to a lock side and a motor rotational force is transmitted to a brake mechanism, then a braking force is generated, but the seal member deformation is insufficient because hydraulic pressure is not applied to the seal member at the time of movement
Solution Approach 1:
The system performs preliminary deformation of the seal member during the lock operation by applying hydraulic pressure to the wheel cylinder. This preliminary action ensures that the seal member is properly deformed before the release operation begins, preventing insufficient pullback of the pressing member during release.
Solution Approach 2:
The invention utilizes hydraulic pressure applied to the wheel cylinder to deform the seal member. By introducing hydraulic pressure into the wheel cylinder during lock operation, the seal member receives the necessary deformation force, which is then utilized during the release operation to ensure adequate pressing member pullback.
2Power
If the piston is moved by the EPB such that a brake pad is caused to come into contact with a brake disc, then a braking force is generated, but the pullback amount of the piston is insufficient when release control is performed
Solution Approach 1:
The system performs preliminary deformation of the seal member during the lock operation by applying hydraulic pressure to the wheel cylinder. This preliminary action ensures that the seal member is properly deformed before the release operation begins, preventing insufficient pullback of the pressing member during release.
Solution Approach 2:
The ECU monitors the operation state and automatically controls the hydraulic pressure application to the wheel cylinder based on the lock and release operations. This feedback mechanism ensures that the seal member receives appropriate deformation during lock operation, which directly influences the pullback performance during release operation.
3Reliability
If a return amount in a direction of separation from the disc is performed by operation of the electric brake, then instability of the pullback amount can be inhibited, but the structure becomes complex and extremely expensive
Solution Approach 1:
The system utilizes the existing hydraulic pressure control mechanisms of the vehicle's brake system to automatically deform the seal member during lock operation. This self-service approach leverages the vehicle's own hydraulic system to solve the pullback issue, eliminating the need for additional dedicated components or complex mechanisms.
Solution Approach 2:
The invention makes the hydraulic pressure system serve multiple functions: it not only provides braking force during normal operation but also deforms the seal member during EPB lock operation to ensure adequate pullback during release. This multi-functionality reduces the need for separate systems and components.
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 solution ensures sufficient piston pullback and reduces the complexity and cost of the brake system by enhancing seal member deformation correction, thereby improving responsiveness and durability.
Implementation Method 1
correct deformation failure of a seal member by applying the increased fluid pressure to the seal member
Implementation Method 2
the seal member can generate a larger restoring force, and it is possible to pull back the pressing member based on the restoring force
Implementation Method 3
the electronic control means automatically increases, by using the brake fluid pressure adjustment means, a wheel cylinder pressure that is the brake fluid pressure inside the wheel cylinder
Implementation Method 4
a motor is caused to rotate to a lock side (rotation in a positive direction) and a motor rotational force is transmitted to a brake mechanism
Data Source
AI summary
A vehicle brake control device is configured to correct deformation failure of a seal member and inhibit insufficient pullback of a pressing member caused by insufficient deformation of the seal member. Within a time period from a start of a lock operation to an end of the release operation, a W/C pressure is automatically increased and insufficient deformation of a seal member is corrected. It is thus possible to generate a large restoring force by the seal member when pulling back a piston, and the piston can be pulled back based on the restoring force. The piston is therefore sufficiently moved, and it is possible to inhibit insufficient piston pullback. Further, it is possible to cause a brake pad to be separated from a brake disc by a predetermined distance, and it is possible to inhibit a feeling of drag of a brake from being imparted to a driver.