Dual fuel injection system control

A method of operating a combustion engine, comprising:

• providing a fuel-air mixture to the combustion engine by injecting a fuel into a cylinder of the combustion engine, the injecting performed by at least one of a primary fuel injection system configured to inject the fuel using a first injection technique, and a supplemental fuel injection system configured to inject the fuel using a second injection technique, the second injection technique being different than the first injection technique;
• monitoring a parameter of a fuel pump connected to the primary fuel injection system and the supplemental fuel injection system;
• and
• based on the parameter being greater than or equal to a parameter threshold, controlling a ratio of a first volume of the fuel injected by the supplemental fuel injection system to a second volume of the fuel injected by the primary fuel injection system during an engine stroke.

A vehicle system comprising:

• a combustion engine;
• a fuel system including a primary fuel injection system configured to inject a fuel into a cylinder of the combustion engine using a first injection technique, and a supplemental fuel injection system configured to inject the fuel into the cylinder using a second injection technique, the second injection technique being different than the first injection technique;
• and
• a controller configured to monitor a parameter of a fuel pump connected to the primary fuel injection system and the supplemental fuel injection system, and based on the parameter being greater than or equal to a parameter threshold, control a ratio of a first volume of the fuel injected by the supplemental fuel injection system to a second volume of the fuel injected by the primary fuel injection system during an engine stroke.