Engine Control Apparatus Pumping Loss Torque Calculation
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Solution Overview
Problem
Existing control systems for internal combustion engines face challenges in calculating pumping loss torque without in-cylinder pressure sensors, leading to increased man-hours for adaptation and reduced accuracy when using atmospheric and intake pressures instead.
Innovation Solution
A control apparatus and method that calculates pumping loss torque using normalized intake pressure, atmospheric pressure, and relational data to reduce man-hours and improve accuracy, incorporating a variable valve characteristic mechanism to adjust valve timing and optimize pumping loss torque calculation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If pumping loss torque is calculated using atmospheric pressure and intake pressure instead of exhaust pressure, then the need for exhaust pressure sensor is eliminated, but the man-hour for adaptation increases due to data association requirements
Solution Approach 1:
The patent transforms the calculation parameters by introducing normalized values (normalized intake pressure and normalized pumping loss torque) that are divided by atmospheric pressure. This parameter transformation allows the system to calculate pumping loss torque using only intake pressure and atmospheric pressure data, eliminating the need for exhaust pressure sensor while maintaining calculation accuracy across different atmospheric conditions without requiring extensive adaptation data
Solution Approach 2:
The patent creates a universal calculation method that works across different atmospheric pressures and engine operating conditions by using normalized parameters. The relational data structure stores normalized pumping loss torque values that can be applied universally regardless of atmospheric pressure variations, making the system adaptable without requiring sensor-specific calibration for each condition
2Measurement precision
If in-cylinder pressure sensor is used to calculate pumping loss torque, then calculation accuracy is improved, but device complexity and cost increase
Solution Approach 1:
The patent creates a virtual representation of exhaust pressure conditions by using normalized intake pressure and stored relational data that captures the relationship between intake pressure, atmospheric pressure, and pumping loss torque. This virtual model replicates the information that would be obtained from direct exhaust pressure measurement without requiring additional sensors or complex hardware modifications
Solution Approach 2:
The patent introduces normalized parameters as intermediary variables that mediate between the easily measurable intake pressure and the difficult-to-measure exhaust pressure. By dividing both intake pressure and pumping loss torque by atmospheric pressure to create normalized values, the system uses these intermediaries to bridge the gap between available sensor data and the desired calculation accuracy
Data Source
AI summary
A control apparatus for an engine, the control apparatus includes an ECU. The ECU is configured to: calculate a normalized intake pressure; calculate a pumping loss torque based on the normalized intake pressure; calculate a first value or a value of a linear function as the normalized intake pressure, the first value is obtained by dividing the intake pressure by the atmospheric pressure; calculate the output value based on the normalized intake pressure and a relational data that associate a normalized output value with the normalized intake pressure; the output value is one of a second value obtained by dividing the pumping loss torque by the atmospheric pressure, a normalized pumping loss torque, a third value obtained by dividing an exhaust pressure by the atmospheric pressure, and a normalized exhaust pressure; and calculate one of the pumping loss torque and the exhaust pressure.