Charge Forming Device Integrating Pressure Sensor
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Solution Overview
Problem
Existing engine systems face challenges in accurately measuring pressure and throttle position, especially at varying altitudes and with dirty air filters, which can affect engine operation and air flow, particularly when the pressure sensor is separate from the device and not integrated effectively with the throttle valve's rotary position determination.
Innovation Solution
A charge forming device with a main body, throttle bore, and housing that includes a throttle valve, circuit board, throttle position sensor, and pressure sensor, where a signal path from the pressure sensor to a pressure source is designed with a liquid collection area below a gaseous area, using an annular wall to separate liquid from the signal path, ensuring gaseous communication with the pressure sensor while preventing liquid interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the pressure sensor is mounted separate from the charge forming device, then the device structure is simpler, but the measurement precision of pressure is reduced
Solution Approach 1:
The pressure sensor is integrated directly into the charge forming device housing, merging the sensing function with the structural component. This eliminates the need for separate mounting and associated signal paths, thereby simplifying the overall device structure while improving pressure measurement precision through direct contact with the pressure source (intake manifold).
2Ease of manufacture
If the signal path is open to liquid collection area, then the device is easier to manufacture, but liquid interference affects pressure sensing reliability
Solution Approach 1:
The signal path is segmented into distinct zones: a liquid collection area and a gaseous area. The pressure sensor is positioned in the gaseous area, separated from the liquid collection area by a defined interface. This segmentation allows the signal path to be easy to manufacture while preventing liquid interference with the pressure sensing function.
Solution Approach 2:
The gaseous area acts as an intermediary medium between the liquid collection area and the pressure sensor. This intermediary zone allows pressure signals to be transmitted to the sensor while preventing direct contact between liquid and the sensor, thereby maintaining reliability without complicating the signal path configuration.
3Measurement precision
If the pressure sensor is integrated with the throttle valve assembly, then the measurement precision of both pressure and throttle position is improved, but the device complexity increases
Solution Approach 1:
The charge forming device housing serves multiple functions: it provides structural support, contains the throttle valve assembly, and houses the pressure sensor. By integrating the pressure sensor into the existing housing structure rather than adding a separate assembly, the device achieves multi-functionality without significantly increasing overall complexity, while improving measurement precision for both pressure and throttle position.
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 allows for accurate and reliable pressure and throttle position sensing, enhancing engine operation by preventing liquid interference and ensuring effective air flow control, even under varying conditions such as different altitudes and with dirty air filters.
Implementation Method 1
a liquid collection area located below a gaseous area with respect to gravity
Data Source
AI summary
In at least some implementations, a charge forming device includes a main body having a throttle bore, a throttle valve, a housing and a circuit board including a throttle position sensor and a pressure sensor. The throttle valve is received at least partially within the valve bore, is rotatable between an idle position and a second position, and includes a magnet that is rotated when the throttle valve rotates. The housing is carried by the main body, and the circuit board is carried by the housing. A signal path is defined leading from the pressure sensor to a pressure source, the signal path includes a liquid collection area located below a gaseous area with respect to gravity.