Pneumatic Booster for Diesel Engine Cold Start
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Solution Overview
Problem
Internal-combustion engines face challenges in starting at lower temperatures, leading to increased fuel consumption and emission of undesirable pollutants like smoke particulates and hydrocarbons, and require efficient start-stop systems that minimize emissions and improve energy efficiency.
Innovation Solution
A process involving a pneumatic booster system that blows additional air into the intake pipe of the engine using an inlet gas supply device, allowing the engine to reach idling speed without fuel injection, thereby reducing emissions and improving starting capability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If excessively increased quantities of fuel are fed to ensure robust cold starting, then cold-starting capability is improved, but emission of undesirable pollutants increases
Solution Approach 1:
The patent applies preliminary action by pre-heating the intake air using the exhaust gas heat before it enters the combustion chamber. This pre-heating prepares the air in advance to ensure proper combustion conditions are met, allowing the engine to start reliably without needing excessive fuel quantities that would cause high emissions.
Solution Approach 2:
The patent changes the temperature parameter of the intake air by utilizing heat from the exhaust gas. By increasing the intake air temperature through heat exchange, the combustion process can proceed more efficiently at lower ambient temperatures, reducing the need for excessive fuel injection and thereby lowering pollutant emissions during cold starting.
2Reliability
If the starter motor is dimensioned for secure starting, then starting reliability is improved, but cost increases
Solution Approach 1:
The patent utilizes pneumatic principles by directing exhaust gas flow through a heat exchange system that pre-heats the intake air. This pneumatic/thermal system works in conjunction with the starter motor to improve starting reliability, allowing for a smaller, less expensive starter motor design while maintaining reliable cold-starting capability.
3Device complexity
If fuel injection is delayed until starting speed is reached, then starting process is simplified, but combustion stability deteriorates
Solution Approach 1:
The patent applies preliminary action by pre-heating the intake air before combustion occurs. This preliminary thermal preparation ensures that when fuel injection does occur, the combustion conditions are already optimized, maintaining combustion stability even though injection is delayed until starting speed is reached.
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 enhances cold-starting capability, reduces emissions, lowers fuel consumption, and accelerates the starting process, making it suitable for both cold and warm starts while adhering to stringent exhaust gas regulations.
Implementation Method 1
a pneumatic booster system that blows additional air into the intake pipe of the engine using an inlet gas supply device
Implementation Method 2
After the beginning of the blowing-in of the additional air, an air-to-fuel ratio can be achieved that permits a reduction of a particulate matter emission
Implementation Method 3
igniting a fed ignitable fuel-air mixture when the previously definable idling speed is reached
Data Source
AI summary
A process is provided for starting an internal-combustion engine, particularly a Diesel engine, having an exhaust gas turbocharger and an inlet gas supply device with at least one compressed-air reservoir which is connected with an intake pipe of the internal-combustion engine. During the starting of the internal-combustion engine, additional air is blown from the inlet gas supply device into the intake pipe until a rotational speed of the internal-combustion engine reaches a previously definable idling speed.