Turbocharger Boost Pressure Estimation via Throttle Temperature
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Solution Overview
Problem
There is a lack of methods for accurately estimating the boost pressure of a turbocharged internal combustion engine under various operating conditions, which affects torque control and transmission behavior, leading to potential errors and inefficiencies.
Innovation Solution
A method that estimates throttle body temperature, intake and exhaust mass flow, turbine inlet and outlet pressures, and turbine speed to calculate the boost pressure, using engine operating parameters and cyclic calculations to achieve accurate and efficient estimation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If no boost pressure estimation method is available, then torque control and transmission behavior suffer from errors and inefficiencies, but implementing a complex and time-consuming routine is not feasible
Solution Approach 1:
The boost pressure estimation is divided into multiple sequential calculation steps: determining throttle body temperature, calculating intake air mass flow, calculating exhaust mass flow, determining turbine inlet pressure, determining turbine outlet pressure, calculating turbine speed, and finally estimating boost pressure. Each step builds upon previous results, breaking down a complex estimation into manageable segments that can be computed efficiently
Solution Approach 2:
The method performs preliminary calculations of intermediate parameters (throttle body temperature, mass flows, pressures, turbine speed) before arriving at the final boost pressure estimation. These preliminary actions are necessary to establish accurate boost pressure values without requiring complex direct measurement routines
2Reliability
If integrator wind up occurs due to inaccurate boost pressure estimation, then torque and boost controller deviations increase, but accurate estimation requires complex routines
Solution Approach 1:
The estimated boost pressure is fed back to the torque and boost controllers to ensure accurate control. The method continuously monitors engine operating conditions and adjusts the estimation accordingly, providing reliable feedback for control decisions without requiring overly complex routines
Solution Approach 2:
The system performs preliminary estimation of boost pressure under current operating conditions before making control decisions, preventing integrator wind up by having accurate baseline values ready for controller adjustment
3Adaptability or versatility
If boost pressure estimation is inaccurate under different ambient conditions, then adaptation learns wrong values, but accurate estimation across all conditions increases complexity
Solution Approach 1:
The estimation method adapts to different ambient conditions by adjusting key parameters such as throttle body temperature, air mass flow, and pressure calculations based on actual operating conditions. This allows accurate boost pressure estimation across varying environments without requiring fundamentally different estimation routines for each condition
4Productivity
If maximum torque estimation is unreliable, then transmission shift behavior becomes inefficient with hunting or toggling between gears, but accurate estimation requires complex calculations
Solution Approach 1:
The system performs preliminary estimation of maximum torque capability under current operating conditions before transmission shift decisions are made. This allows the transmission control to anticipate available torque and select appropriate shift points, preventing hunting or toggling between gears while using a manageable calculation routine
Data Source
AI summary
A method of estimating a boost pressure of a turbocharger is disclosed. A throttle body temperature is estimated as a function of engine operating parameters. An intake air mass flow and an exhaust mass flow are estimated as a function of the throttle body temperature. A turbine inlet pressure and a turbine outlet pressure are estimated as a function of engine operating parameters. A turbine speed is estimated as a function of the intake air mass flow, exhaust mass flow and turbine inlet and outlet pressure. The boost pressure is estimated as a function of the turbine speed. Estimation of the maximum boost pressure of a turbocharged internal combustion engine is performed method cyclically as follows: estimating a throttle temperature, estimating an air mass flow and an exhaust mass flow, estimating a turbine inlet pressure and a turbine outlet pressure, estimating a turbine speed, and estimating the maximum boost pressure.