Engine Control Device Bypass Valve Supercharger Pressure
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Solution Overview
Problem
Existing control systems for internal combustion engines with superchargers face challenges in managing supercharging pressure, particularly at high rotation and load operations, leading to potential engine damage and requiring complex control methods that increase man-hours for data measurement and adaptation, while also struggling to handle torque requirements from sources other than the driver.
Innovation Solution
A control device that includes a throttle valve, supercharger, bypass valve, and associated drive units, which calculates and adjusts target intake air amounts, charging efficiency, throttle opening degrees, supercharger pressures, and bypass valve openings to manage acceleration response and torque requirements, using a microprocessor-based ECU to integrate sensor inputs and perform feedback control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a bypass valve is used to control supercharging pressure in a mechanical supercharger, then engine safety is improved, but control complexity and data measurement requirements increase
Solution Approach 1:
The control system is segmented into multiple independent calculation units: target intake air amount calculation unit, target charging efficiency calculation unit, target supercharger downstream pressure calculation unit, target compressor driving force calculation unit, and target bypass valve opening degree calculation unit. Each unit handles a specific aspect of the control problem, making the overall complex system more manageable and adaptable.
Solution Approach 2:
The control system dynamically adjusts the bypass valve opening degree based on real-time calculations of compressor driving force requirements. The target bypass valve opening degree is continuously updated based on the difference between actual and target compressor driving forces, enabling adaptive control that responds to changing engine conditions without requiring complex predetermined maps.
2Reliability
If complex control methods are used to manage supercharging pressure, then engine safety is improved, but man-hours for data measurement and adaptation increase
Solution Approach 1:
The control system uses the engine's own operating parameters (intake air amount, charging efficiency, supercharger pressures) to self-determine the optimal bypass valve opening degree. The target bypass valve opening degree calculation unit automatically computes the required control value based on real-time sensor data and pre-stored compressor characteristics, eliminating the need for extensive external data measurement and adaptation.
Solution Approach 2:
The system implements feedback control by continuously monitoring the actual compressor driving force and comparing it with the target value. The target bypass valve opening degree is adjusted based on the difference between actual and target compressor driving forces, creating a closed-loop control system that automatically adapts to changing conditions without requiring manual calibration.
3Speed
If torque-based control is implemented, then acceleration response characteristic is improved, but handling multiple torque requirements becomes difficult
Solution Approach 1:
The target bypass valve opening degree calculation unit serves multiple functions: it handles torque-based control for acceleration response, accommodates torque requirements from other control devices, and manages supercharging pressure control. This multi-functional approach allows the system to handle diverse torque requirements through a unified control mechanism.
Solution Approach 2:
The control system dynamically prioritizes different torque requirements based on current operating conditions. The target compressor driving force calculation unit adjusts its calculations to accommodate varying torque demands, enabling the system to switch between acceleration-oriented control and other control device requirements as needed.
Data Source
AI summary
A control device for an internal combustion engine is configured to: calculate a target intake air amount and a target charging efficiency based on a target torque; control an opening degree of a throttle valve (6) based on the target intake air amount; calculate a target supercharger downstream pressure based on the target charging efficiency; detect a pressure on an upstream side of a supercharger; calculate a target compressor driving force based on the target intake air amount, the target supercharger downstream pressure, and the supercharger upstream pressure; and calculate a target bypass valve opening degree based on the target compressor driving force, to thereby control an opening degree of a bypass valve (12) provided to a bypass passage for bypassing the supercharger.