Gas Engine Starting Device Exhaust Gas Purge Control
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Solution Overview
Problem
Existing starting devices for gas internal combustion engines fail to completely discharge non-combusted gas from the engine and exhaust channel before ignition, leading to abnormal combustion and reduced safety, durability, and reliability.
Innovation Solution
A starting device that utilizes compressed air for slow air turning, with an exhaust-gas purification system and a control device to adjust rotation speed, allowing for the discharge of accumulated gases and preventing abnormal combustion by using a shared component for cost efficiency and improved structure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If pre-purge is performed to discharge remaining gas from combustion chamber, then non-combusted gas is removed from combustion chamber, but gas may accumulate in exhaust channel and cause abnormal combustion
Solution Approach 1:
The patent performs a second dry-air injecting step after pre-purge to discharge accumulated gas from the exhaust channel. This preliminary action ensures that gas accumulating in the exhaust channel during pre-purge is removed before ignition startup, preventing abnormal combustion while maintaining the benefits of pre-purge.
2Reliability
If dry air is injected into intake channel before spark plug operation, then humidity inside intake channel is reduced, but this may not be sufficient to prevent gas accumulation in exhaust channel
Solution Approach 1:
The patent performs a second dry-air injecting step after pre-purge and before ignition startup to specifically address gas accumulation in the exhaust channel. This additional preliminary action complements the first dry-air injecting step, ensuring both intake channel humidity control and exhaust channel gas discharge.
3Reliability
If reciprocating motion is repeated sufficiently many times to discharge gas from combustion chamber, then non-combusted gas is removed, but air in supply-air channel may completely pass through and remain insufficient
Solution Approach 1:
The patent performs a second dry-air injecting step after pre-purge to supplement the air supply. This ensures that even if the reciprocating motion during pre-purge consumes most of the air in the supply channel, sufficient dry air is available for the subsequent ignition startup phase.
Data Source
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AI summary
An object of the present invention is to provide a starting device for a gas internal combustion engine whereby non-combusted gas accumulating in the gas internal combustion engine and an exhaust channel is discharged before ignition startup of the gas internal combustion engine and abnormal combustion of the gas internal combustion engine is prevented so as to improve safety, breakage prevention, durability and reliability. A starting device of a gas internal combustion engine 1 having an air starting device 30 includes a rotation-speed detection unit of the gas internal combustion engine 1, a compressed-air introduction unit 5 for supplying compressed air to each of cylinders according to an order of an ignition timing of the gas internal combustion engine 1, a compressed-air supply unit 3 for supplying the compressed air to the compressed-air introduction unit 5, and a control device 2 including a cumulative rotation-speed setting device 21 whereby an operator can set a threshold value of a cumulative rotation speed optionally, the control device 2 being configured to halt supply of the compressed air by the compressed-air supply unit 3 when a set cumulative rotation speed is achieved on the basis of the rotation speed detected by the rotation-speed detection unit.