Brake Pump Housing Layout for ECU Leak Isolation
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Solution Overview
Problem
The use of a BLAC motor in a brake system poses challenges due to the need for additional installation space for sensing the rotational position of the shaft, and there is a risk of working fluid leakage into the electronic control unit from the pump, causing mechanical breakdown.
Innovation Solution
A pump housing layout that connects the suction channel of the pump to an oil reservoir, with the suction channel positioned closer to the shaft than the discharge channel, and the discharge channel spaced further away, preventing fluid leakage into the electronic control unit by guiding high-pressure fluid to the reservoir.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a BLAC motor is used instead of a DC motor, then operation noise is reduced, but installation space increases due to the need for rotational position sensing devices
Solution Approach 1:
The patent combines the rotational position sensing function with the existing shaft structure by coupling the sensed component to the end of the shaft, eliminating the need for separate sensing devices and additional installation space. The sensor is integrated into the electronic control unit housing, further reducing space requirements.
Solution Approach 2:
The shaft serves multiple functions: it transmits rotational motion from the motor to the pump while also serving as the mounting structure for the rotational position sensing component. This multi-functionality eliminates the need for separate components and reduces overall installation space.
2Measurement precision
If the shaft extends to the electronic control unit to couple the sensed component, then rotational position sensing is enabled, but working fluid leakage into the electronic control unit causes mechanical breakdown
Solution Approach 1:
The patent extracts the rotational position sensing function from the shaft extension area and relocates it to a position on the shaft that does not extend into the electronic control unit housing. This separation prevents working fluid from reaching the electronic control unit while maintaining sensing capability.
Solution Approach 2:
The pump housing acts as an intermediary barrier between the working fluid in the pump chamber and the electronic control unit. By positioning the sensor and sensed component within or adjacent to the pump housing rather than extending into the electronic control unit, the housing prevents direct contact between working fluid and electronic components.
3Reliability
If the suction channel is connected to the oil reservoir, then working fluid leakage is prevented, but the pump housing layout becomes more complex
Solution Approach 1:
The patent merges the suction channel connection with the existing pump housing structure by forming the suction port directly in the pump housing and connecting it to the oil reservoir through the pump-reservoir pipeline. This integration avoids adding separate complex components while achieving leakage prevention.
Data Source
AI summary
According to at least one embodiment, the present disclosure provides a pump system for a brake system, comprising: an oil reservoir; a pump housing having a suction port and a discharge port formed therein; a motor disposed at a side of the pump housing; an electronic control unit disposed at another side of the pump housing; a pump installed in the pump housing and having a suction channel, which is connected with the suction port, and a discharge port, which is connected with the discharge port, therein; a shaft coupled to the motor to rotate and having a rotating body configured to operate the pump; and a pump-reservoir pipeline configured to connect the suction channel to the oil reservoir.