Engine Speed Control Device for Automatic No-Load Idling
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Solution Overview
Problem
Conventional engine speed control systems for small size engines used in farm working machines require manual operator intervention and complex configurations to detect and adjust for no-load conditions, leading to reduced efficiency and difficulty in responding to changing load conditions.
Innovation Solution
An engine speed control device that independently detects no-load conditions using a memory device and judgment devices to automatically adjust the throttle opening, eliminating the need for external sensors or signal systems and allowing for automatic idling speed operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If manual operator intervention is used to detect and adjust for no-load conditions, then the system can respond to changing load conditions, but the operator efficiency is reduced and the system complexity increases
Solution Approach 1:
The engine control system automatically detects no-load conditions by monitoring its own operational parameters (throttle opening, engine speed, fuel injection rate) and autonomously adjusts the throttle valve position without requiring external operator intervention. This self-service mechanism eliminates manual switching operations while maintaining adaptability to load changes, directly resolving the contradiction between system adaptability and operator efficiency
2Measurement precision
If external sensors or signal systems are used to detect no-load conditions, then the detection accuracy can be improved, but the device complexity increases
Solution Approach 1:
The patent extracts the no-load detection functionality from external sensors and signal systems, instead utilizing already-present engine parameters (throttle opening degree, engine speed, fuel injection rate) that are inherently available in the engine control system. This extraction eliminates the need for additional external detection devices while maintaining detection accuracy, resolving the contradiction between measurement precision and device complexity
Solution Approach 2:
The existing engine control system components are made multi-functional: the throttle position sensor serves both as a control actuator indicator and as a no-load detection sensor; the engine speed sensor serves both as a speed control parameter and as a load condition indicator. This universality eliminates the need for dedicated external sensors, reducing system complexity while maintaining detection capability
Data Source
AI summary
Providing an engine speed control device and an engine speed control method, wherein the no-load condition of the farm working machine can be estimated independently of the farm working machine and a no-loading operation condition of the engine can be automatically shifted to an idling condition. An engine speed control device with which the engine drives a farm working machine, the engine speed control device provided with: a memory section 8 in which the throttle opening threshold levels corresponding to the target engine speeds are memorized; a first judgment device that reads out the throttle opening threshold level corresponding to the target engine speed from the memory device, and judges whether or not the current throttle opening threshold level is smaller than or equal to the throttle opening threshold level corresponding to the target engine speed; a target engine speed determining section 16 by which the target engine speed diminishes to a low idling engine speed in a case where the first judgment device judges that the current throttle opening threshold level is smaller than or equal to the throttle opening threshold level corresponding to the target engine speed; and, a throttle opening regulating device 14 that regulates the opening of the throttle valve based on the target engine speed.