Systems and methods for in-cylinder engine pressure sensor cooling

A method for performing a combustion cycle, the method comprising:

• performing an intake stroke of a combustion cycle of a combustion engine and cooling or reducing a pressure of or around an in-cylinder pressure sensor, wherein the combustion engine includes an engine cylinder housing a movable piston, an air intake system, and an exhaust system, wherein the in-cylinder pressure sensor is housed in a sensor cavity that is fluidly connected to the engine cylinder, and wherein movement of the piston during the intake stroke causes a one way check valve to open in a cooling line system to draw air in from the air intake system to the sensor cavity;
• performing an exhaust stroke of the combustion cycle;
• and
• repeating the intake stroke to again draw air in from the air intake system to the sensor cavity.

An engine system, the engine system comprising:

• an air intake system;
• an engine cylinder;
• a piston, wherein the piston is movable within the engine cylinder during a combustion cycle, and wherein the engine cylinder is fluidly connected to the air intake system via an intake port and an intake valve;
• a fuel injector configured to inject a first fuel into the engine cylinder;
• an exhaust system, wherein the exhaust system is fluidly connected to the engine cylinder via an exhaust port and an exhaust valve;
• a source of a second fuel fluidly connected to the air intake via a fuel valve to deliver a second fuel into the engine cylinder;
• and
• an in-cylinder pressure sensor fluidly connected to the engine cylinder, wherein the in-cylinder pressure sensor is fluidly connected to the air intake system via an in-cylinder pressure sensor cooling line.