Engine Control Apparatus with Temperature-Adaptive Load Thresholds
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Solution Overview
Problem
In engine control systems, setting a threshold for the throttle aperture to accurately determine the presence or absence of an engine load is challenging due to internal load variations caused by external temperature changes, which affects the auto throttle function and frequency management.
Innovation Solution
An engine control apparatus with a governor control mechanism, including an engine controlling unit, an engine temperature detecting unit, and a threshold changing unit that adjusts throttle aperture thresholds based on engine temperature using map data to accurately determine engine load presence or absence, thereby adjusting engine frequency accordingly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the threshold of the throttle aperture is set higher to address throttle aperture fluctuation caused by internal load variations, then the reliability of load detection is improved, but the usage area of external load detection is reduced
Solution Approach 1:
The patent applies dynamics by making the threshold value changeable based on operating conditions. Specifically, the threshold of the throttle aperture is adjusted according to engine temperature and other operating parameters, allowing the system to adapt to internal load variations while maintaining accurate external load detection across different usage areas
Solution Approach 2:
The patent changes the parameter of the threshold value based on engine temperature and operating conditions. By dynamically adjusting this parameter, the system compensates for internal load variations caused by temperature changes, thereby maintaining both high detection accuracy and wide adaptability for external load detection
2Adaptability or versatility
If the threshold of the throttle aperture is set lower to secure wide usage area of external load, then the adaptability is improved, but the reliability of load detection deteriorates due to throttle aperture fluctuation
Solution Approach 1:
The system dynamically adjusts the threshold based on real-time operating conditions such as engine temperature. This dynamic adaptation allows the threshold to be lower when conditions permit (expanding usage area) while maintaining reliability when internal load variations are significant
Solution Approach 2:
The system uses feedback from temperature sensors and operating condition monitoring to continuously adjust the threshold value. This feedback mechanism ensures that the threshold remains optimal for both detection accuracy and usage area coverage under varying operating conditions
3Use of energy by moving object
If the engine frequency is lowered during no load to improve fuel efficiency, then the energy consumption is reduced, but the detection accuracy of slight external loads becomes difficult
Solution Approach 1:
The patent changes the detection threshold parameter based on engine temperature and operating conditions. This allows the system to maintain high detection accuracy for slight external loads even when operating at low frequencies during no-load conditions, as the adaptive threshold compensates for the reduced sensitivity that would otherwise occur at lower frequencies
Data Source
AI summary
The engine control apparatus includes a governor control mechanism for keeping the engine frequency constant, decides the “presence” or “absence” of the engine load by the throttle aperture and forcibly changes the engine frequency to a predetermined frequency depending on the presence or absence of the load, the engine control apparatus includes an engine controlling unit (10) for controlling fuel supply to an engine (1), an engine temperature detecting unit (4) for detecting an engine temperature of the engine (1), and a threshold changing unit (10a) for changing each throttle aperture as a threshold for deciding the “presence” or “absence” of an engine load depending on the engine temperature detected by the engine temperature detecting unit (4).