Multi-Stage Turbo Supercharging Bypass Valve Map Control
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Solution Overview
Problem
Existing multi-stage turbo supercharging systems require complex and costly pressure sensor configurations to achieve desired supercharging performance, leading to increased costs and potential failures.
Innovation Solution
A multi-stage turbo supercharging system with a simplified configuration that uses pre-defined bypass valve opening degree maps based on engine operation modes, eliminating the need for pressure sensors or using simpler sensors, and includes EGR and nozzle vane control to optimize performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If pressure sensors are used to control bypass valve opening degree in multi-stage turbo supercharging systems, then supercharging performance can be optimized, but system cost increases and reliability decreases due to sensor failures
Solution Approach 1:
The patent extracts the pressure sensing function from the physical sensor and relocates it to the control device through map-based determination. The bypass valve opening degree is determined based on engine operating parameters (rotation speed, load, intake pressure, exhaust pressure) stored in maps within the control device, eliminating the need for separate pressure sensors in the supercharging system.
Solution Approach 2:
The control device performs multiple functions: it controls both the bypass valve and EGR valve, and determines bypass valve opening degree using existing engine parameter sensors rather than dedicated pressure sensors. This multi-functional approach reduces component count while maintaining control capability.
2Measurement precision
If complex pressure sensor configurations are implemented to achieve desired supercharging performance, then measurement precision improves, but device complexity and cost increase
Solution Approach 1:
The patent introduces map-based opening degree determination as an intermediary between engine operating parameters and bypass valve control. The maps contain pre-stored relationships between engine parameters (rotation speed, load, intake pressure, exhaust pressure) and optimal bypass valve opening degrees, serving as a mediator that translates sensor inputs into precise control outputs without requiring complex direct pressure sensing.
Solution Approach 2:
The optimal bypass valve opening degrees for various operating conditions are pre-calculated and stored in maps within the control device. This preliminary action allows the system to achieve precise control by simply looking up and applying pre-determined values based on current engine parameters, rather than performing complex real-time pressure measurements and calculations.
3Productivity
If bypass valve opening degree is controlled based on pressure sensor measurements, then supercharging performance improves, but manufacturing cost increases
Solution Approach 1:
The patent replaces expensive, failure-prone pressure sensors with a control-based solution using existing sensors and map lookups. The 'disposable' element here is the simplified sensor configuration that can be easily replaced or updated through software (maps) rather than hardware changes, reducing overall system cost while maintaining performance.
Solution Approach 2:
The control device uses its own processing capability and stored maps to determine bypass valve opening degree, making the system self-sufficient. Rather than relying on external pressure sensors, the control device leverages existing engine parameter measurements and its internal computational resources to achieve precise control, reducing dependency on additional expensive components.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Achieves desired supercharging performance while reducing costs and avoiding sensor-related failures, with improved fuel efficiency and reduced NOx generation through optimized bypass and EGR valve control.
Implementation Method 1
A turbocharger is configured to rotary-drive a turbine with exhaust gas of an engine, compress air through rotation of a compressor provided coaxially with the turbine
Implementation Method 2
compress air through rotation of a compressor provided coaxially with the turbine, and supply the compressed air to the engine
Implementation Method 3
a bypass valve disposed in the bypass passage... determine an opening degree command value for the bypass valve... control the opening degree of the bypass valve
Implementation Method 4
an EGR passage which brings the exhaust passage and the intake passage into communication; and an EGR valve disposed in the EGR passage
Implementation Method 5
a variable geometry turbocharger including a variable nozzle vane for adjusting a flow velocity of exhaust gas to a turbine blade
Data Source
AI summary
A multi-stage turbo supercharging system includes: a bypass passage which bypasses a turbocharger from among a plurality of turbochargers, in an intake passage or an exhaust passage of the engine; a bypass valve disposed in the bypass passage; an operation mode selection part; a bypass valve opening degree map selection part configured to select at least one bypass valve opening degree map in accordance with the operation mode selected by the operation mode selection part, from among a plurality of bypass valve opening degree maps which represent respective relationships between a plurality of control parameters of the engine and an opening degree of the bypass valve; a bypass valve opening degree determination part configured to determine an opening degree command value for the bypass valve on the basis of the bypass valve opening degree map and control parameter information representing the plurality of control parameters; and a bypass valve opening degree control part configured to control the opening degree of the bypass valve on the basis of the opening degree command value for the bypass valve.