Charge Air Bypass for Combustion Engine Warm-Up
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Solution Overview
Problem
Conventional turbocharger systems face delays in reaching ideal combustion temperature during cold starts, leading to inefficient engine starting and increased nitrogen oxide emissions, due to rapid cooling of compressed air by large metallic coolers and condensation of humidity.
Innovation Solution
A method involving a preheating stage where supercharged air bypasses the cooler and directly enters the engine, followed by a cooling stage where combustion gases exchange heat with the cooler, accelerating the temperature rise and reducing water condensation risks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If charge air is passed through the intercooler during cold start-up, then the air temperature is reduced, but the warm-up time increases and moisture condensation occurs
Solution Approach 1:
The system dynamically switches between two operational modes: during cold start-up, the charge air bypasses the intercooler to prevent excessive cooling and moisture condensation, while during normal operation, the charge air flows through the intercooler for proper cooling. This dynamic configuration resolution allows the system to adapt to different thermal conditions and eliminate the warm-up delay.
Solution Approach 2:
The charge air flow path is segmented into two separate routes: a first path that bypasses the intercooler and a second path that flows through the intercooler. A selection mechanism enables switching between these segments based on engine operating conditions, allowing optimization of both cold start-up performance and normal operation efficiency.
2Temperature
If charge air is cooled by the intercooler during cold start-up, then overheating is prevented, but nitrogen oxide emissions increase due to delayed temperature stabilization
Solution Approach 1:
The system dynamically adjusts the charge air cooling based on engine temperature conditions. During cold start-up when nitrogen oxide emissions are a concern, the system disables intercooler cooling to allow faster temperature stabilization and reduce emissions. Once the engine reaches optimal operating temperature, the intercooler is activated to maintain proper charge air temperature control.
Solution Approach 2:
The system performs preliminary heating of the charge air path components during cold start-up by routing hot exhaust gases through the intercooler before normal operation begins. This preliminary action pre-heats the intercooler and associated components, reducing the warm-up delay and preventing nitrogen oxide emissions during the critical start-up phase.
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 approach quickly brings the engine and cooler to ideal combustion temperature, enhancing starting conditions and reducing nitrogen oxide emissions by ensuring effective combustion and preventing water ingress.
Implementation Method 1
during the preheating stage at least a part of the combustion gases exiting the cylinders (3) are brought around and/or into the intercooler (50), so that these combustion gases exchange heat with the intercooler (50)
Implementation Method 2
a charge air cooler from a compressor... an intercooler with a heat exchanger incorporating a coolant circuit, usually water, in contact with the charge air circuit
Data Source
Figure 1~2
Figure 3~4
Figure 5~6
AI summary
The present invention concerns a method for sending charge air into a heat engine (2) comprising the following steps: - a preheating step, in which, when the engine is started up, the flow of charge air (A) through the cooler (50) is stopped and the charge air is sent directly into the cylinders (3) of the engine, then - a cooling step, in which the flow of charge air through the cooler is restored, such that the charge air passes into the cooler before entering the cylinders. The invention also concerns a system (1) for implementing this method and a distributor for this system.