Internal Combustion Engine Control Using Temperature Differential
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current internal combustion engine control devices for two-wheeled vehicles are complex and costly due to the need for multiple sensors to detect combustion states, particularly for abnormal combustion like knock, which requires high-speed data sampling, leading to increased weight and size, and inefficient fuel consumption.
Innovation Solution
An internal combustion engine control device that uses a control unit to manage fuel, air, and ignition based on temperature differences between a wall surface temperature inside the combustion chamber and a representative temperature of the engine, allowing for simplified detection and control of combustion states without the need for additional sensors, thereby optimizing ignition timing and reducing fuel consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple sensors (oxygen concentration sensor, intake pipe pressure sensor, hot-wire intake air mass sensor, exhaust pipe temperature sensor, catalyst temperature sensor) are provided to detect combustion state, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The patent combines two temperature sensor elements (first and second temperature sensor elements) into a single temperature sensor unit with a common case. This integrated structure allows simultaneous measurement of different temperature parameters (combustion chamber wall temperature and coolant temperature) while reducing the overall number of separate sensors and simplifying the detection system configuration.
2Measurement precision
If high-speed data sampling is implemented to detect knock combustion, then measurement precision is improved, but device complexity and cost increase
Solution Approach 1:
The patent replaces complex high-speed data sampling systems with a simpler temperature differential measurement approach. By measuring the temperature difference between the combustion chamber wall (first temperature sensor element) and coolant (second temperature sensor element), the system can detect abnormal combustion states without requiring high-speed sampling hardware and associated complex processing systems.
3Reliability
If multiple sensors are added to detect combustion state, then reliability is improved, but weight and size increase
Solution Approach 1:
The patent merges multiple temperature sensing functions into a single integrated temperature sensor unit. The first and second temperature sensor elements are housed in a common case and mounted together on the combustion chamber wall, reducing the total weight and space required compared to using separate sensors for each temperature measurement point.
4Reliability
If multiple sensors are added to detect combustion state, then reliability is improved, but manufacturing cost increases
Solution Approach 1:
The integrated temperature sensor unit with common case reduces manufacturing costs by minimizing the number of separate components that need to be sourced, installed, and calibrated. The unified structure allows for simpler assembly processes and reduced installation time compared to installing multiple separate sensors, thereby lowering overall manufacturing and installation costs while maintaining reliable combustion state detection.
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 solution enables accurate detection and control of combustion states with a simple configuration, improving fuel efficiency and reducing the complexity and cost of the engine control system, while effectively suppressing knock and achieving higher engine efficiency.
Implementation Method 1
a first temperature sensor element is fixedly arranged at an apical end in the case... the first temperature sensor element... corresponds to a temperature of a first portion in the wall defining a combustion chamber
Implementation Method 2
a second temperature sensor element is disposed on a side of the outer wall surface of the wall... the second temperature sensor element... corresponds to a temperature of a second portion on an outer wall surface side than the first portion
Data Source
Figure 1
Figure 2
Figure 3A~3B
AI summary
In an internal combustion engine control device (100), a control unit (107b) controls the operating state of an internal combustion engine (1) on the basis of a difference ΔTCC between a first temperature TCC corresponding to the temperature of a first site in a wall portion defining a combustion chamber of the internal combustion engine (1), and a second temperature TE corresponding to the temperature of a second site in the wall portion, where said second site is further toward an outer wall surface than the first site.