The phrase "automatically engage" is correct and usable in written English.
It can be used in contexts where something is triggered or activated without manual intervention, often in technology or processes.
Example: "The system is designed to automatically engage the safety protocols when a malfunction is detected."
Alternatives: "instantly activate" or "trigger automatically".
On holiday alone, you almost automatically engage more.
And taking another cue from cars, they linked the brakes so that when the rider applied the front brake, the back one would automatically engage.
These new systems automatically engage the parking brake when the car is stopped and the transmission is set in park, or the engine turned off.
A critical question for investigators will be why the rear train's computer system, which among other things controls the brakes, apparently did not automatically engage just before the crash.
Sensors inside the pedals automatically engage the motor when they sense the rider needs assistance.
The standard version, which in the US starts at a cool $19,999, makes use of a 107hp 1-litre two-cylinder engine and an on-demand all-wheel-drive system that powers the rear wheels until slippage is detected, when it will automatically engage the front wheels for additional traction.
When a marriage breaks down, for example, divorce proceedings are automatically engaged.
Examples of autonomous weapons systems already in use include the US Navy's Phalanx gun system that automatically engages incoming threats and the Israeli Harpy drone that automatically attacks radar emitters.
Although I'm not automatically engaged by stories about getting or losing religion, the subject is ultimately put to some use in "Carnivàle," and not just presented as riveting in and of itself.
The iA mode automatically engages features and settings for optimal image quality based on the shooting conditions and can be used for both still photos and in video recording.
When the sidestand is extended for parking, a brake automatically engages, a feature that will be appreciated by anyone who has witnessed a parked bike slowly roll away and fall over.
