Multivariable dynamic control system of a multi-fuel engine

A method comprising:

• calculating an autoignition delay of a mixture of a first combustion fuel and a pre-mixed combustion fuel mixture that are supplied to a multi-fuel engine, the autoignition delay calculated based on one or more operating conditions of the multi-fuel engine;
• calculating an upper limit on an amount of the pre-mixed combustion fuel mixture that is supplied to the multi-fuel engine based on the autoignition delay that is calculated;
• controlling flow of the pre-mixed combustion fuel mixture into the multi-fuel engine to control the amount of the pre-mixed combustion fuel mixture that is injected into and consumed by the multi-fuel engine from exceeding the upper limit;
• and
• decreasing the amount of the pre-mixed combustion fuel and increasing an amount of the first combustion fuel if the autoignition delay is less than a designated threshold.

An engine control unit comprising:

• one or more processors configured to determine one or more of a manifold airflow temperature of an engine that concurrently consumes both a first combustion fuel and a pre-mixed combustion fuel mixture, a manifold airflow pressure of the engine, an airflow into or out of the engine, a speed of the engine, an air-to-fuel ratio of the engine, an exhaust temperature of the engine, a turbocharger speed, or a cylinder pressure of one or more cylinders of the engine,
• the one or more processors configured to determine an autoignition delay of the first combustion fuel and the pre-mixed combustion fuel based on the one or more of the manifold airflow temperature, the manifold airflow pressure, the airflow, the speed of the engine, the air-to-fuel ratio, the exhaust temperature, the turbocharger speed, or the cylinder pressure,
• the one or more processors configured to control an amount of the pre-mixed combustion fuel mixture that is supplied to the engine while both the first combustion fuel and the pre-mixed combustion fuel mixture continue to be supplied to the engine based on the autoignition delay;
• and
• the one or more processors configured to decrease the amount of the pre-mixed combustion fuel mixture and increase an amount of the first combustion fuel to increase the autoignition delay.