Engine Idle Speed Control for Vibration Reduction
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Solution Overview
Problem
Internal combustion engine idle speed control systems face challenges in managing RPM variations when shifting from neutral to reverse gear, leading to undesirable noise and vibration, especially when the brake is applied, affecting vehicle speed consistency.
Innovation Solution
A control system that detects transmission neutral engagement, gear changes, and vehicle speed to set three distinct target idle speeds: a higher speed during neutral, a lower speed when reversing with the brake applied, and a lower speed when reversing without brake, thereby minimizing noise and vibration while maintaining consistent vehicle speed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the engine idle speed is increased to reduce noise and vibration during neutral operation, then noise and vibration are reduced, but speed variation occurs when shifting to reverse gear
Solution Approach 1:
The patent applies dynamics by making the engine idle speed adjustable based on operating conditions. The system dynamically transitions between a first idle speed (higher) during neutral operation to reduce noise and vibration, and a second idle speed (lower) when reverse gear is engaged to maintain speed consistency. This dynamic adjustment resolves the contradiction between noise reduction and speed stability.
Solution Approach 2:
The patent changes the engine idle speed parameter based on transmission state and vehicle speed. When the transmission shifts from neutral to reverse gear, the control system detects the gear change and adjusts the idle speed parameter from the first speed to the second speed. This parameter change eliminates speed variation during gear transitions while maintaining noise reduction benefits.
2Object-affected harmful factors
If the engine idle speed is maintained at a higher level during reverse gear operation, then noise and vibration are reduced, but the vehicle experiences higher than desired speed of travel
Solution Approach 1:
The system dynamically adjusts idle speed based on real-time operating conditions. During reverse gear operation, when vehicle speed exceeds a threshold, the control system transitions from the first idle speed to the second idle speed. This dynamic response prevents excessive vehicle speed while maintaining noise reduction when appropriate.
Solution Approach 2:
The patent employs feedback by continuously monitoring vehicle speed and transmission state. When the vehicle speed exceeds the threshold during reverse gear operation, the feedback signal triggers the control system to reduce idle speed from the first level to the second level. This feedback mechanism ensures the vehicle speed remains within desired limits while minimizing noise and vibration.
Data Source
AI summary
An apparatus, method, and system for controlling an idle speed of an internal combustion engine during certain vehicle component operations to minimize unwanted motion and vibration. A transmission neutral engagement, a transmission forward or reverse gear engagement, and a vehicle speed are detected. An engine target idle speed is set to a first speed during the neutral engagement. An engine target idle speed is set to a second idle speed when a vehicle speed is less than a threshold speed and the forward or reverse gear is activated. The vehicle target idle speed is set to a third idle speed when the vehicle speed is greater than a threshold speed while the forward or reverse gear is activated, wherein the first target idle speed, second target idle speed and third target idle speed are different engine speeds.