Engine Supercharging Pressure Control via Flow Rate Correction
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Solution Overview
Problem
Existing control devices for internal-combustion engines face challenges in accurately calculating and controlling supercharging pressure, leading to inefficiencies in engine operation and control accuracy.
Innovation Solution
A control device that includes a supercharger and a flow rate change mechanism, with a basic estimated supercharging pressure calculating unit, a flow rate change state parameter acquiring unit, a correction value calculating unit, and an estimated supercharging pressure calculating unit, which calculates and corrects the supercharging pressure to reflect the operating state and flow rate changes of the engine.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a control device calculates supercharging pressure based on basic estimated values without considering flow rate changes, then the control system is simpler, but the measurement precision of supercharging pressure deteriorates
Solution Approach 1:
The control device continuously monitors the flow rate change state parameter and uses it to correct the basic estimated supercharging pressure in real-time, creating a feedback loop that improves measurement precision without significantly increasing system complexity
Solution Approach 2:
The system dynamically adjusts the supercharging pressure calculation by introducing a correction value based on the flow rate change state parameter, transforming the static basic estimated value into a dynamic corrected value that reflects actual operating conditions
2Productivity
If the control device uses only basic estimated supercharging pressure without correction, then the calculation process is faster and simpler, but the control accuracy deteriorates
Solution Approach 1:
The control device performs preliminary calculation of the basic estimated supercharging pressure using fast computational methods, then applies a correction based on the flow rate change state parameter to achieve high accuracy without sacrificing calculation speed
Solution Approach 2:
The flow rate change state parameter serves as an intermediary factor that bridges the gap between the basic estimated pressure and the actual supercharging pressure, enabling accurate control without requiring complex direct measurements
3Device complexity
If the control device does not consider flow rate change state, then the device complexity is lower, but the reliability of supercharging pressure control deteriorates
Solution Approach 1:
The control device incorporates the flow rate change state parameter as a feedback element that continuously adjusts the supercharging pressure calculation, improving control reliability by accounting for dynamic flow variations
Solution Approach 2:
The system transitions from a static pressure estimation approach to a dynamic correction approach by incorporating the flow rate change state parameter, enabling the control device to adapt to changing operating conditions and improve reliability
Data Source
AI summary
A control device for an internal-combustion engine includes circuitry. The circuitry is configured to calculate, in accordance with an operating state of the internal-combustion engine, a basic supercharging pressure of intake gas generated by a supercharger provided in the internal-combustion engine. The circuitry is configured to acquire a flow rate change state parameter that correlates with a change state of the flow rate of the intake gas controlled by a flow rate control mechanism provided in the internal-combustion engine. The circuitry is configured to calculate a correction value in accordance with the flow rate change state parameter. The circuitry is configured to calculate an estimated supercharging pressure of the intake gas by correcting the basic supercharging pressure with the correction value. The circuitry is configured to control operation of the internal-combustion engine using the estimated supercharging pressure.