Throttle and Bypass Valve Drive With Shared Motor and Position Sensing
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Solution Overview
Problem
Existing throttle devices with bypass systems incur increased cost and weight due to separate actuators for the throttle and bypass valves, and the opening degree of the bypass valve is often inaccurately adjusted based on intake-air temperature and pressure sensors.
Innovation Solution
A throttle device with a common motor and gears to drive both the throttle and bypass valves, using a sensor to detect the rotation amount of the bypass valve, allowing accurate adjustment of the opening degree through a coordinated control system.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If separate actuators are provided for driving the bypass valve in addition to the throttle valve, then the bypass valve can be controlled independently, but the cost and weight of the throttle device are increased
Solution Approach 1:
The patent combines the control functions of the throttle valve and bypass valve into a single actuator. The actuator includes a motor that drives both valves through a differential mechanism, eliminating the need for separate actuators and thereby reducing cost and weight while maintaining independent control capability
Solution Approach 2:
The single actuator is designed to perform multiple functions: controlling both the throttle valve and bypass valve independently. The differential mechanism allows the actuator to drive either valve separately or both simultaneously, providing universal control capability
2Adaptability or versatility
If the opening degree of the bypass valve is adjusted based on intake-air temperature and pressure sensors, then the control system can respond to environmental conditions, but the adjustment accuracy is insufficient
Solution Approach 1:
The patent implements a feedback mechanism where a sensor detects the actual opening degree of the bypass valve and feeds this information back to the control unit. The control unit compares the detected opening degree with the target opening degree and adjusts the actuator accordingly, ensuring accurate positioning regardless of environmental conditions
Solution Approach 2:
The patent replaces the indirect mechanical sensing method (using intake-air temperature and pressure sensors) with a direct sensing method. A dedicated sensor directly measures the bypass valve opening degree, providing precise feedback for accurate control
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
The solution reduces the cost and weight of the throttle device while ensuring precise control of both the throttle and bypass valves, enhancing engine performance and combustibility.
Implementation Method 1
a first gear configured to be able to transmit or block the driving force of the motor with respect to the first rotatable shaft, a second gear configured to receive the driving force of the motor and transmit the driving force to the second rotatable shaft
Implementation Method 2
a sensor for detecting a rotation amount of the second rotatable shaft of the bypass valve or another rotatable shaft rotating in conjunction with the second rotatable shaft
Data Source
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AI summary
A throttle device 1 includes a throttle valve 2 which is disposed in an intake passage 101, and includes a first valve body 20 and a first rotatable shaft 21 for rotatably holding the first valve body 20, a bypass valve 3 which is disposed in a bypass passage 8 connected to the intake passage 101 so as to bypass the throttle valve 2, and includes a second valve body 30 and a second rotatable shaft 31 for rotatably holding the second valve body 30, a common motor 4 for applying a driving force to the throttle valve 2 and the bypass valve 3, a first gear 5 configured to be able to transmit or block the driving force of the motor 4 with respect to the first rotatable shaft 21, a second gear 6 configured to receive the driving force of the motor 4 and transmit the driving force to the second rotatable shaft 31, and a sensor 7 for detecting a rotation amount of the second rotatable shaft 31 of the bypass valve 3 or another rotatable shaft rotating in conjunction with the second rotatable shaft 31.