Engine Speed Reference Start Mode

The Engine Speed Reference Start Mode parameter allows for the initial starting operation of the engine to be changed to Batch Fire from Sequential.  Setting this parameter to Batch Fire will have the M1 starting to fire the fuel injectors and ignition coils whilst the Engine Speed Reference State is in Pattern Lock.  The normal operation of Sequential will wait until Cycle Lock is achieved before attempting to run the engine.

The advantage of using the Batch Fire mode over Sequential is that you are using the combustion cycle to assist in turning the engine over, this is beneficial in installations where due to the engines architecture or electrical system constraints the starter motor is not able to generate high rotational speeds when cranking. 

Batch fire will also allow for the engine to start and run without a valid Synchronisation signal using some Reference Modes.  This is not a recommended mode of operation, and should be avoided if possible.   

Batch Fire	0	Batch Fire mode allows Fuel and Ignition outputs to operate as soon as possible. This allows starting the engine: Faster: with many Reference Mode. Without a synchronisation sensor. With a faulty synchronisation sensor. When Reference is operating in Batch Fire mode State will report either: Cylinder Lock: When the ignition system is setup for a distributor and the Reference pattern repeats once for each of the Cylinders. Fuel timing may be offset by a multiple of (Cycle Duration / Cylinders)°. Revolution Lock: the Reference pattern repeats once per engine revolution. Fuel timing may be offset by 360°. NOTE: Batch Fire mode not recommended for direct injection or diesel engines. This is because fuel output timing may be offset.
Sequential	1	Full sequential operation. Fuel and ignition outputs are only driven when State is Cycle Lock. This was the only starting mode supported in M1 Systems before 1.4.0.88.

The Engine Speed Reference State will report if the engine was running in Cylinder Lock or Revolution Lock.

Cylinder Lock will only occur if the M1 has been configured to use a distributor, this is done by allocating the same Ignition Output to all cylinders.

Cylinder Lock	11	Locked to the engine cylinder. Engine synchronous pulses such Fuel and Ignition can be generated but are not synchronised with the correct cylinder. Only used when: Start Mode is Batch Fire Reference pattern repeats once per cylinder. One example of this is one tooth per firing The ignition system is setup for a distributor
Revolution Lock	12	Locked to the engine revolution. Engine synchronous pulses such as Fuel and Ignition can be generated but will not be synchronised with the correct cylinder. Only used when: Start Mode is Batch Fire Reference pattern repeats once per engine revolution. One example of this is a "missing tooth" mode. Individual coil ignition systems will generate an additional Wasted Spark: one spark per engine revolution.