Systems and methods for an on-board ammonia cracking system with an exhaust gas cracking bypass for cold start conditions

An on-board ammonia cracking system for supplying hydrogen fuel to an internal combustion engine, the system comprising:

• an ammonia tank containing ammonia;
• an exhaust gas cracking unit;
• an electric cracking unit coupled in series to the exhaust gas cracking unit;
• a first valve coupled between the ammonia tank and the exhaust gas cracking unit;
• a second valve coupled between the ammonia tank and the electric cracking unit;
• and
• an electronic control unit (ECU) coupled to the first valve and the second valve, wherein the ECU closes the first valve to prevent ammonia flow to the exhaust gas cracking unit and opens the second valve to allow ammonia flow to the electric cracking unit when the internal combustion engine is not producing exhaust gas having a temperature sufficient to facilitate ammonia cracking.

An on-board ammonia cracking system for supplying hydrogen fuel to an internal combustion engine, the system comprising:

• an ammonia tank containing ammonia;
• an exhaust gas cracking unit;
• an electric cracking unit coupled in series to the exhaust gas cracking unit;
• a first valve coupled between the ammonia tank and the exhaust gas cracking unit;
• a second valve coupled between the ammonia tank and the electric cracking unit;
• a check valve coupled between the second valve and the electric cracking unit;
• and
• an electronic control unit (ECU) coupled to the first valve and the second valve, wherein the ECU closes the first valve to prevent ammonia flow to the exhaust gas cracking unit and opens the second valve to allow ammonia flow to the electric cracking unit when the internal combustion engine is not producing exhaust gas having a temperature sufficient to facilitate ammonia cracking.