Internal Combustion Engine Wall Surface Temperature Estimation
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Solution Overview
Problem
Existing internal combustion engine control devices face challenges in accurately estimating wall surface temperature, particularly when the engine block is cooled, leading to inadequate control of actuator operations.
Innovation Solution
An internal combustion engine control device is developed, comprising an engine state estimation unit, a wall surface temperature estimation unit, and an operation amount calculation unit. The device calculates energy transfer from gas to the wall surface based on operating conditions, chemical conditions, and engine status, then uses this to estimate wall surface temperature and determine actuator operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the wall surface temperature is estimated using conventional methods (PTL 1), then the estimation can be performed under normal operating conditions, but the estimation accuracy deteriorates when the engine block is cooled
Solution Approach 1:
The invention changes the estimation parameters from simple map-based lookup (PTL 1) to a comprehensive energy balance calculation that includes heat generation from combustion, heat transfer to coolant, and heat transfer to oil. This parameter transformation enables accurate wall surface temperature estimation under various conditions including cooling operations, where conventional methods fail.
2Temperature
If the coolant temperature is lowered to cool the engine block, then the cooling effect is improved, but the wall surface temperature estimation accuracy deteriorates
Solution Approach 1:
The invention implements a feedback mechanism where the estimated wall surface temperature is continuously updated based on the calculated energy balance. This feedback loop allows the system to maintain accurate temperature estimation even when coolant temperature changes dynamically during cooling operations, enabling appropriate actuator control under varying thermal conditions.
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
This configuration improves the accuracy of wall surface temperature estimation, enabling more effective control of actuators and enhancing fuel consumption and exhaust performance.
Implementation Method 1
calculates an energy transfer amount from the gas in the internal combustion engine to the wall surface
Data Source
AI summary
An internal combustion engine control device includes an engine state estimation unit, a wall surface temperature estimation unit, and an operation amount calculation unit. The engine state estimation unit calculates the energy transfer amount from the gas to the wall surface based on the parameter related to the operating condition, the parameter related to the chemical condition of combustion, and the parameter related to an operation status. The wall surface temperature estimation unit estimates the wall surface temperature on the basis of the energy transfer amount from the gas to the wall surface. The operation amount calculation unit calculates an operation amount of an actuator provided in the internal combustion engine on the basis of the wall surface temperature estimated by the wall surface temperature estimation unit.