Electric Booster Stroke Detection Integration
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Solution Overview
Problem
The existing electric booster configurations with stroke detection devices increase in size, leading to deteriorated mountability on vehicles due to the external placement of stroke sensors.
Innovation Solution
An electric booster design that integrates a stroke detection device with a first magnetism detection element and a rotational angle detection portion with a second magnetism detection element inside a casing, along with an electric motor and control device, to detect movement and rotational angles without increasing the booster's size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a stroke sensor is disposed alone outside the master cylinder, then the stroke detection function is achieved, but the size of the electric booster increases and vehicle mountability deteriorates
Solution Approach 1:
The patent combines the stroke detection device with the master cylinder by integrating the first magnetism detection element into the master cylinder structure. The first magnet is disposed on the input member and the first magnetism detection element is disposed in the master cylinder, allowing stroke detection without increasing the overall booster size.
Solution Approach 2:
The stroke detection device is nested within the master cylinder structure. The first magnetism detection element is disposed inside the master cylinder, and the first magnet is disposed on the input member that passes through the master cylinder, creating a nested arrangement that saves space.
2Volume of moving object
If stroke detection device and rotational angle detection portion are integrated inside the casing, then the size is reduced and mountability is improved, but the wiring complexity inside the casing increases
Solution Approach 1:
The patent combines multiple detection devices (stroke detection and rotational angle detection) within the same casing structure. Both the first and second magnetism detection elements are disposed inside the casing, sharing the same space and reducing overall complexity despite the wiring requirements.
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 configuration improves vehicle mountability by maintaining a compact size while accurately detecting stroke and rotational angles, enhancing the electric booster's functionality.
Implementation Method 1
a first magnetism detection element configured to detect magnetism from this first magnet
Implementation Method 2
a second magnetism detection element configured to detect magnetism from this second magnet
Data Source
AI summary
An electronic booster includes an electric motor configured to thrust a piston in a master cylinder, a stroke detection device configured to detect a movement amount of an input member connected to a brake pedal, a rotational angle detection portion configured to detect a rotational angle of a rotational shaft of the electric motor, a control device configured to control driving of the electric motor, and a casing containing a wiring electrically connecting the electric motor and the control device to each other. The stroke detection device includes a first magnet configured to move together with the input member and a first magnetism detection element configured to detect magnetism from the first magnet. The rotational angle detection portion includes a second magnet configured to move together with the rotational shaft of the electric motor and a second magnetism detection element configured to detect magnetism from the second magnet.