Brake Piston Pump Lead Screw Positioning for Stable Pressure
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Solution Overview
Problem
In hydraulic vehicle brake systems, determining the precise position at which a piston stops is challenging, leading to inconsistent brake pressure and compromised driving safety.
Innovation Solution
A piston pump group for a brake system is designed with a lead screw transmission assembly, a planetary gear assembly, and a limiting member to precisely control the piston's movement and position, ensuring stable brake pressure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a piston pump is used for service braking and slip adjustment, then brake pressure can be generated and delivered, but the position at which the piston stops is difficult to determine, leading to inconsistent brake pressure
Solution Approach 1:
A limiting member is introduced as an intermediary element between the follower and the pump body. This limiting member serves as a physical reference that defines the zero point position of the piston, enabling precise position determination through mechanical contact rather than complex sensing systems.
Solution Approach 2:
The collision between the follower and limiting member provides tactile feedback that signals the piston has reached its zero point position. This feedback mechanism allows the control system to identify and record the precise stop position, ensuring consistent starting points for subsequent braking operations.
2Device complexity
If the piston moves without precise position control, then the pump structure remains simple, but driving safety is affected due to inability to ensure expected brake pressure
Solution Approach 1:
The limiting member acts as a simple mechanical intermediary that provides position reference without requiring complex sensors, actuators, or control algorithms. This maintains pump structure simplicity while enabling reliable position determination for safety-critical brake pressure control.
Solution Approach 2:
The system uses its own mechanical components (follower and limiting member) to determine piston position rather than requiring external sensing systems. The collision between existing parts provides the necessary position information, avoiding additional complexity while ensuring safety.
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 solution provides stable brake pressure and improved operating stability by accurately controlling the piston's position and preventing collisions, thus enhancing driving safety.
Implementation Method 1
the lead screw transmission assembly is used for driving the follower to move relative to the operating chamber
Implementation Method 2
a planetary gear assembly used for transmitting power to the lead screw transmission assembly
Data Source
AI summary
A piston pump group for a brake system and a control method thereof are provided, and the piston pump group includes: a piston, a pump body provided with an operating chamber, and a transmission mechanism used for driving the piston to move in the operating chamber, where the transmission mechanism includes a lead screw transmission assembly, a follower, and a planetary gear assembly used for transmitting power to the lead screw transmission assembly, the follower is fixedly connected to the piston, the lead screw transmission assembly is used for driving the follower to move relative to the operating chamber, and a limiting member used for limiting the movement of the follower is disposed between the lead screw transmission assembly and the follower.