Damper Control Using Engine Speed Derivative
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing damper control methods fail to effectively manage rapid changes in engine speed, leading to inadequate air supply, increased emissions, and catalyst cooling, resulting in inefficient combustion and increased engine oil consumption.
Innovation Solution
A method and damper system that regulate fluid flow based on the change in engine speed over time, using parameters such as the time derivative of engine speed and clutch activation to control the damper's position and prevent low pressure in the inlet pipe, ensuring appropriate air supply and catalyst efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If the throttle damper limits the amount of air reaching the engine, then the exhaust gas temperature is maintained for catalyst efficiency, but the pressure in the inlet pipe drops causing motor oil to be drawn in through valve seals
Solution Approach 1:
The control system predicts rapid engine speed increases based on clutch activation signals before they actually occur. When clutch activation is detected, the throttle damper is preemptively opened to a safe position, preventing negative pressure buildup and motor oil ingestion before the harmful condition can develop.
Solution Approach 2:
The system continuously monitors engine speed, clutch position, and throttle damper position to dynamically adjust the damper opening. This closed-loop control ensures the damper responds appropriately to changing engine conditions, maintaining positive pressure in the inlet pipe while allowing exhaust gas temperature to remain within operational ranges for the catalyst.
2Temperature
If the throttle damper remains closed during rapid engine speed increase, then exhaust gas temperature is maintained, but air supply becomes insufficient leading to increased harmful emissions
Solution Approach 1:
The control system detects clutch activation as an indicator of impending rapid engine speed increase and preemptively opens the throttle damper. This preliminary action ensures sufficient air supply is available before the engine speed surge occurs, preventing incomplete combustion and hazardous particle emissions while still allowing the system to maintain appropriate exhaust gas temperatures.
Solution Approach 2:
The throttle damper position is dynamically adjusted based on real-time engine conditions including clutch position and engine speed. The system transitions from a static control approach to a dynamic one, where the damper opening varies continuously to optimize both air supply and exhaust gas temperature management during transient operating conditions.
3Object-affected harmful factors
If the damper opens rapidly to prevent low pressure, then air supply is sufficient, but the catalyst may be cooled below operational temperature
Solution Approach 1:
By detecting clutch activation in advance, the system opens the throttle damper to a predetermined safe position before rapid engine speed increase occurs. This preliminary action prevents excessive negative pressure and motor oil ingestion while controlling the rate of opening to avoid sudden large volumes of cold air that would cool the catalyst below operational temperature.
Solution Approach 2:
The control system changes the throttle damper opening parameter in a controlled manner based on engine speed and clutch position. Rather than making abrupt full-opening movements, the system adjusts the opening degree progressively, balancing the need to prevent negative pressure with the need to maintain exhaust gas temperature for catalyst efficiency.
4Device complexity
If the damper is controlled only by current engine speed, then simple control logic is used, but rapid changes in engine speed are not detected leading to inadequate air supply
Solution Approach 1:
The control system uses clutch position as a leading indicator to predict rapid engine speed changes before they occur. This preliminary detection allows the system to prepare by opening the throttle damper in advance, significantly improving air supply responsiveness during transient conditions without requiring complex algorithms to analyze engine speed derivatives or predict future states.
Solution Approach 2:
The clutch position signal serves as an intermediary indicator that mediates between simple control logic and the need for rapid response. By monitoring this intermediate parameter, the system can detect impending rapid engine speed changes and adjust the throttle damper accordingly, bridging the gap between simple control architecture and high responsiveness requirements.
Data Source
Figure 1
Figure 2
Figure 3
AI summary
The present invention relates to a damper for regulating a flow in a pipe (2) connected to an engine (10), which damper (1) is adapted to assuming a plurality of different positions in the pipe (2), thereby regulating a fluid flow through the pipe, and to being controlled on the basis of a first parameter P1 which represents a change per unit time in a speed ? of the engine (10). The invention further relates to a system, an engine system and a motor vehicle, and to a method for control of a damper (1).