Accelerator Position Sensor Magnet Pole Configuration
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The existing accelerator position sensors in vehicles have a limited degree of freedom in design with respect to detection angle and operating load due to the same magnetized states on the end and side faces of the magnet, leading to a trade-off between fully open throttle grip angle and operating load.
Innovation Solution
An accelerator position sensor with a magnet extended along the throttle grip's rotation axis, featuring different numbers of magnetic poles magnetized on the end and side faces, allowing for independent adjustment of detection angle and operating load.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the same number of magnetic poles are magnetized on both the end face and side face of the magnet, then the structure is simple, but the degree of freedom in design with respect to detection angle and operating load is low
Solution Approach 1:
The patent applies local quality by magnetizing different numbers of magnetic poles on different faces of the magnet. Specifically, the end face has a first number of magnetic poles for detection purposes, while the side face has a second number of magnetic poles for generating operating load. This allows each face to be optimized for its specific function, increasing design freedom without significantly complicating the overall magnet structure.
2Measurement precision
If the fully open angle of the throttle grip is increased, then the detection angle is improved, but the operating load on the driver decreases
Solution Approach 1:
The patent segments the magnetic pole configuration into two independent parts: magnetic poles on the end face that determine detection angle, and magnetic poles on the side face that determine operating load. By separating these functions to different faces with different numbers of magnetic poles, the system can independently optimize detection angle without being constrained by operating load requirements, and vice versa.
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 increases the design flexibility for detection angle and operating load, enabling a desired detection angle while providing a suitable operating load for the driver.
Implementation Method 1
detection of an accelerator opening is often performed by detection of a magnetic flux generated by a magnet rotating together with a throttle grip by a magnetic sensor
Implementation Method 2
detection of the rotation angle of a throttle grip by detection of a magnetic flux generated by a magnet rotating together with a throttle grip by a magnetic sensor
Implementation Method 3
generates an operating load on the driver by a resistance force generated in the tubular member made of magnetic material
Data Source
AI summary
An accelerator position sensor according to the present invention is held inside a throttle grip of a vehicle rotationally operated by a driver. The accelerator position sensor includes: a magnet extended along a rotation axis of the throttle grip and configured to rotate in conjunction with the throttle grip; a magnetic detection unit arranged so as to face a predetermined face of the magnet; and a magnetic body arranged so as to face another face that is different from the predetermined face of the magnet. On the predetermined face and the other face of the magnet, respectively, mutually different numbers of magnetic poles are magnetized along a rotation direction of the magnet.