Auto Choke Valve Control for Engine Start Reliability
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Solution Overview
Problem
Conventional auto choke devices for engines struggle to ensure proper engine start under varying start conditions such as temperature, humidity, and fuel quality, leading to potential engine stalling.
Innovation Solution
An auto choke device that activates the choke valve from a fully closed position upon starter motor activation, with controlled valve opening based on engine temperature and speed, using a controller with characteristics data maps to adjust the opening speed and position for reliable engine start.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the valve opening motion of the choke valve is controlled based on limited conditions such as the temperature of the engine, then the control system remains simple, but the proper opening of the choke valve may not be obtained during the start under varying starting conditions
Solution Approach 1:
The patent applies dynamics by making the choke valve opening control adaptive and variable based on multiple changing parameters. The control system dynamically adjusts the choke valve opening degree and opening speed based on engine temperature, engine speed, and other varying starting conditions, rather than using fixed control settings. This allows the system to reliably handle diverse starting conditions while maintaining reasonable control complexity.
Solution Approach 2:
The patent changes multiple control parameters simultaneously - not only engine temperature but also engine speed, choke valve opening degree, and opening speed. By monitoring and responding to changes in these parameters, the system determines the appropriate choke valve opening state. This multi-parameter approach improves engine start reliability under varying conditions without requiring excessively complex control logic.
2Reliability
If the choke valve opening is optimized for specific temperature conditions, then the start performance improves under those conditions, but the engine may stall when other starting conditions (humidity, fuel quality, atmospheric pressure) vary
Solution Approach 1:
The patent makes the control system universal by designing it to handle multiple types of starting conditions and variations. The control device can adapt to different humidity levels, fuel qualities, atmospheric pressures, and temperature conditions through its multi-parameter monitoring and adaptive control capabilities. This multi-functional approach allows the system to maintain reliable engine start performance across diverse and varying starting conditions.
Solution Approach 2:
The patent implements feedback control by continuously monitoring engine speed, engine temperature, and other parameters during the starting process. Based on this feedback information, the control device dynamically adjusts the choke valve opening to maintain optimal starting conditions. This feedback mechanism enables the system to adapt to varying starting conditions and prevent engine stalling.
3Productivity
If the choke valve opens quickly to ensure proper air intake, then the engine starts faster, but the valve opening speed may not be appropriate for all temperature and speed conditions
Solution Approach 1:
The patent applies dynamics to the choke valve opening control by making the opening speed variable rather than fixed. The control device dynamically adjusts the choke valve opening speed based on real-time engine temperature and engine speed conditions. This allows the system to achieve fast engine start when conditions permit while adapting the opening speed to suit different temperature and speed conditions, thereby maintaining both productivity and adaptability.
Data Source
AI summary
An auto choke device for an engine includes a choke valve for varying the opening of an intake passage of the engine, and a starter motor for starting the engine. Upon activation of the starter motor, the choke valve starts valve opening motion from a fully closed position. The choke valve continues the valve opening motion at a certain valve opening speed until it achieves a start opening set based on the temperature of the engine.