What is the "trial for ignition" or "flame proving time" for direct spark ignition systems?

The "trial for ignition" or "flame proving time" is the duration during which a direct spark ignition system attempts to ignite the fuel-to-air mixture in a combustion chamber. The purpose of this interval is to ensure that a proper flame is established and maintained; if the flame does not ignite within this time frame, the system will typically shut down to prevent unsafe operating conditions such as unburned fuel accumulation.

In direct spark ignition systems, the trial for ignition is commonly set between 4 to 8 seconds. This timeframe allows enough opportunity for the system to initiate and prove that a flame has been successfully established. If the flame is detected within this range, the ignition system will then continue to operate normally. Thus, the selected duration around 4 to 8 seconds reflects standard practice in industry norms for safely managing the ignition process in these systems.