Throttle Valve Angle Detection Hollow Shaft Hall Sensor
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Solution Overview
Problem
Existing systems for detecting the angle of rotation of a throttle valve in motor vehicles face challenges in measuring both the manually specified power setpoint and actual throttle valve position simultaneously, often requiring separate and bulky components, leading to increased installation space and susceptibility to electromagnetic interference.
Innovation Solution
A 'shaft in tube' design where a setpoint encoder shaft is mechanically connected to the throttle valve shaft, allowing simultaneous measurement of the desired and actual power values using ring magnets and SMD Hall sensors, which are compact and reduce electromagnetic interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If Hall sensors are arranged upright on the printed circuit board to detect the radial magnetic field, then the measurement can be performed, but the construction volume increases and miniaturized SMD Hall sensors cannot be used
Solution Approach 1:
Instead of detecting the radial magnetic field with upright Hall sensors, the patent inverts the approach by detecting the axial magnetic field with laterally arranged Hall sensors. The permanent magnet is oriented to produce an axial field, and Hall sensors are mounted laterally on the printed circuit board, enabling the use of miniaturized SMD components while maintaining measurement functionality.
Solution Approach 2:
The patent replaces the mechanical arrangement of upright Hall sensors with a lateral mounting configuration. This substitution allows the use of SMD technology and automated assembly processes, reducing construction volume while maintaining the essential measurement function through a different sensor orientation and magnetic field detection approach.
2Reliability
If separate housings are used for electronics and servomotor, then the components are protected, but the installation space increases
Solution Approach 1:
The patent merges the separate housings for electronics and servomotor into a single integrated housing. This combination reduces the total installation space while maintaining component protection through a unified sealed structure. The integration also reduces the number of sealing interfaces and assembly steps.
Solution Approach 2:
The single housing serves multiple functions: it protects both the electronics and servomotor, provides structural support, and enables compact integration of all control components. This multi-functional design eliminates the need for separate protective housings while maintaining reliability.
3Measurement precision
If conventional Hall sensors are used, then the magnetic field can be detected, but electromagnetic interference increases
Solution Approach 1:
The patent replaces conventional through-hole Hall sensors with SMD Hall sensors, which have smaller internal circuitry and reduced electromagnetic emissions. This substitution maintains magnetic field detection capability while significantly reducing electromagnetic interference with surrounding components.
Solution Approach 2:
The use of SMD Hall sensors represents a transition to more modern, compact sensor technology that inherently produces less electromagnetic interference. These sensors are standard industry components that provide sufficient durability for automotive applications while minimizing harmful electromagnetic effects.
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
Enables precise power control with reduced installation space and lower electromagnetic interference, allowing for integrated control electronics and actuator components in a single housing, enhancing reliability and efficiency.
Implementation Method 1
Hall sensors are arranged in the movement circle of this permanent magnet segment, which detect the radial magnetic field on the outside and on the inside of the permanent magnet
Data Source
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AI summary
Apparatus for detecting the angle of rotation for a throttle valve operated by means of an electric motor, which throttle valve is rotatably supported on a throttle valve shaft (4) in an intake system (3) of a throttle valve housing (2), wherein an actuating motor (24) which is coupled to the throttle valve shaft (4) predefines the throttle valve angular position in a manner controlled by a control electronics (17), and wherein a predetermined value of the throttle valve angular position can be predefined by means of a manually operated predetermined-value input apparatus (6) and is fed to the control electronics, characterized in that the throttle valve shaft (4) is in the form of a hollow shaft; in that the predetermined-value input apparatus (6) is coupled to a predetermined-value sensor shaft (7) which is coaxially arranged in the hollow shaft such that it can rotate and so its angular position in each case corresponds to the manually predefined predetermined value of the throttle valve angular position; in that one end of the throttle valve shaft (4) and one end of the predetermined-value sensor shaft (7) are guided out at one side (26) of the throttle valve housing (2); in that a permanent magnet (11, 12) is arranged at each of these ends; in that a magnetic-field sensor arrangement (13, 14, 15, 16) is provided for detecting the magnetic field of these permanent magnets (11, 12), which magnetic-field sensor arrangement (13, 14, 15, 16) produces in each case an angle-dependent electric signal from the throttle valve angular position and from the angular position of the predetermined-value sensor shaft, and each of these signals is fed to the control electronics (17).